Academic literature on the topic 'Deep eutectic solvent-based systems'

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Journal articles on the topic "Deep eutectic solvent-based systems"

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Liu, Xiangwei, Qian Ao, Shengyou Shi, and Shuie Li. "CO2 capture by alcohol ammonia based deep eutectic solvents with different water content." Materials Research Express 9, no. 1 (2022): 015504. http://dx.doi.org/10.1088/2053-1591/ac47c6.

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Abstract The existing CO2 absorption by deep eutectic solvents is limited by the unavoidable water absorption problem during use. In this study, we prepared three deep eutectic solvents with different alcohol aminations and added different water contents to discuss the effect of water content on the absorption of carbon dioxide by deep eutectic solvents. All deep eutectic solvents have a low melting point at room temperature as a liquid and have high thermal stability, where the choline chloride-diethanolamine deep eutectic solvents have a high viscosity. Anhydrous choline chloride-monoethanolamine deep eutectic solvents have the largest CO2 absorption, reaching 0.2715 g g−1, and the absorption of CO2 by anhydrous choline chloride-N-methyldiethanolamine deep eutectic solvents is only 0.0611 g g−1. Water content inhibited the absorption of CO2 in primary amine and secondary amine systems, whereas it enhanced the absorption of CO2 in tertiary amine systems, which was related to the reaction process of deep eutectic solvent and CO2.
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Guo, Hong, Xinyi Ma, Zhipeng Chen, Jing Guo, and Jianjun Lu. "Efficient 5-hydroxymethylfurfural production in ChCl-based deep eutectic solvents using boric acid and metal chlorides." RSC Advances 15, no. 5 (2025): 3664–71. https://doi.org/10.1039/d5ra00020c.

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This study reveals an efficient method for the production of 5-HMF in ChCl-based DESs using boric acid and metal chlorides, explores the reaction mechanism, and compares different deep eutectic solvent systems.
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Vuksanovic, Jelena, Nina Todorovic, Mirjana Kijevcanin, Slobodan Serbanovic, and Ivona Radovic. "Experimental investigation and modeling of thermophysical and extraction properties of choline chloride + DL-malic acid based deep eutectic solvent." Journal of the Serbian Chemical Society 82, no. 11 (2017): 1287–302. http://dx.doi.org/10.2298/jsc170316054v.

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The ability of non-toxic and biodegradable deep eutectic solvent (DES) choline chloride + DL-malic acid in mole ratio 1:1, for the breaking of the azeotropes heptane + methanol and toluene + methanol by means of liquid? ?liquid extraction was evaluated. Ternary liquid?liquid equilibrium experiments were performed at 298.15 K and at atmospheric pressure. Densities, viscosities and refractive indices of DES + methanol and water + DES systems were experimentally determined over a wide temperature range and at atmospheric pressure. Additionally, the viscosities of DES + glycerol mixture were - determined at temperatures up to 363.15 K to check how much the addition of glycerol decreases high viscosities of DES. The results indicate that the addition of small amounts of water or glycerol as a third component significantly decreases the viscosity of the investigated deep eutectic solvent. Based on the selectivity and distribution ratio values, the extraction ability of the investigated deep eutectic solvent, in comparison with the conventionally used solvents, yields promising results. Non-random two-liquid (NRTL) and universal quasichemical (UNIQUAC) models were satisfactorily applied for correlation of experimental phase equilibrium data for two ternary mixtures.
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Majová, Veronika, Silvia Horanová, Andrea Škulcová, Jozef Šima, and Michal Jablonský. "Deep eutectic solvent delignification: Impact of initial lignin." BioResources 12, no. 4 (2017): 7301–10. http://dx.doi.org/10.15376/biores.12.4.7301-7310.

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This study aimed to resolve the issue of the lack of detailed understanding of the effect of initial lignin content in hardwood kraft pulps on pulp delignification by deep eutectic solvents. The authors used Kappa number of the concerned pulp, intrinsic viscosity, and selectivity and efficiency of delignification as the parameters of the effect. The pulp (50 g oven dry pulp) was treated with four different DESs systems based on choline chloride with lactic acid (1:9), oxalic acid (1:1), malic acid (1:1), and system alanine:lactic acid (1:9); the results were compared to those reached by oxygen delignification. The results showed that the pulp with a higher initial lignin content had a greater fraction of easily removed lignin fragments.
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Cysewski, Piotr, Tomasz Jeliński, and Maciej Przybyłek. "Experimental and Theoretical Insights into the Intermolecular Interactions in Saturated Systems of Dapsone in Conventional and Deep Eutectic Solvents." Molecules 29, no. 8 (2024): 1743. http://dx.doi.org/10.3390/molecules29081743.

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Solubility is not only a crucial physicochemical property for laboratory practice but also provides valuable insight into the mechanism of saturated system organization, as a measure of the interplay between various intermolecular interactions. The importance of these data cannot be overstated, particularly when dealing with active pharmaceutical ingredients (APIs), such as dapsone. It is a commonly used anti-inflammatory and antimicrobial agent. However, its low solubility hampers its efficient applications. In this project, deep eutectic solvents (DESs) were used as solubilizing agents for dapsone as an alternative to traditional solvents. DESs were composed of choline chloride and one of six polyols. Additionally, water–DES mixtures were studied as a type of ternary solvents. The solubility of dapsone in these systems was determined spectrophotometrically. This study also analyzed the intermolecular interactions, not only in the studied eutectic systems, but also in a wide range of systems found in the literature, determined using the COSMO-RS framework. The intermolecular interactions were quantified as affinity values, which correspond to the Gibbs free energy of pair formation of dapsone molecules with constituents of regular solvents and choline chloride-based deep eutectic solvents. The patterns of solute–solute, solute–solvent, and solvent–solvent interactions that affect solubility were recognized using Orange data mining software (version 3.36.2). Finally, the computed affinity values were used to provide useful descriptors for machine learning purposes. The impact of intermolecular interactions on dapsone solubility in neat solvents, binary organic solvent mixtures, and deep eutectic solvents was analyzed and highlighted, underscoring the crucial role of dapsone self-association and providing valuable insights into complex solubility phenomena. Also the importance of solvent–solvent diversity was highlighted as a factor determining dapsone solubility. The Non-Linear Support Vector Regression (NuSVR) model, in conjunction with unique molecular descriptors, revealed exceptional predictive accuracy. Overall, this study underscores the potency of computed molecular characteristics and machine learning models in unraveling complex molecular interactions, thereby advancing our understanding of solubility phenomena within the scientific community.
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Fan, Jing, Xin Zhang, Nan He, Fenhong Song, and Hongwei Qu. "Deep Eutectic Solvent + Water System in Carbon Dioxide Absorption." Molecules 29, no. 15 (2024): 3579. http://dx.doi.org/10.3390/molecules29153579.

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In the present work, deep eutectic solvents (DESs) were synthesized in a one-step process by heating the hydrogen bond acceptors (HBAs) tetrabutylammonium bromide and tetrabutylphosphonium bromide, along with two hydrogen bond donors (HBDs) ethanolamine and N-methyldiethanolamine, which were mixed in certain molar ratios. This mixture was then mixed with water to form a DES + water system. The densities of the prepared DES + water systems were successfully measured using the U-tube oscillation method under atmospheric pressure over a temperature range of 293.15–363.15 K. The CO2 trapping capacity of the DES + water systems was investigated using the isovolumetric saturation technique at pressures ranging from 0.1 MPa to 1 MPa and temperatures ranging from 303.15 K to 323.15 K. A semi-empirical model was employed to fit the experimental CO2 solubility data, and the deviations between the experimental and fitted values were calculated. At a temperature of 303.15 K and a pressure of 100 kPa, the CO2 solubilities in the DES + water systems of TBAB and MEA, with molar ratios of 1:8, 1:9, and 1:10, were measured to be 0.1430 g/g, 0.1479 g/g, and 0.1540 g/g, respectively. Finally, it was concluded that the DES + water systems had a superior CO2 capture capacity compared to the 30% aqueous monoethanolamine solution commonly used in industry, indicating the potential of DES + water systems for CO2 capture.
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Tang, Yiquan, Sainan Shang, Jiyou Yang, et al. "Synthesis and application of biomass-based carbon dots in deep eutectic solvent systems." Industrial Crops and Products 224 (February 2025): 120440. https://doi.org/10.1016/j.indcrop.2024.120440.

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Sconyers, David J., Musashi Briem, Daniel J. Curran, and Joshua A. Maurer. "Electrochemistry of Trivalent Chromium in Ionic-Liquid/Deep Eutectic Solvent-Based Ternary Aqueous Solutions." ECS Meeting Abstracts MA2024-02, no. 22 (2024): 1937. https://doi.org/10.1149/ma2024-02221937mtgabs.

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Hexavalent chromium electroplating has come under severe scrutiny, with increasingly strict regulations and plans for complete removal from operations within the US within the next 10 years. Hexavalent chromium poses large risks, as it is a known carcinogen and presents severe occupational and environmental hazards in its use. However, chromium coatings offer many benefits, including excellent wear and corrosion resistance, along with good hardness and adhesion properties. As such, an effective chromium plating alternative for hexavalent-based processes is sorely needed. Trivalent chromium systems represent a promising and safer alternative to existing technologies due to their decreased toxicity. However, fundamental challenges in addressing the thermodynamics and equilibria of chromium’s complex aqueous chemistry have made the successful development of new plating methodologies difficult. Present solutions incorporate a multitude of complexing agents that play unknown roles in stabilizing trivalent chromium itself or its reduced intermediates. An alternative approach is to use ionic liquids/deep eutectic solvents or ionic liquid/deep eutectic solvent and water mixed systems, which have unique physical and chemical characteristics that could support and poise trivalent chromium for effective electrodeposition. Here, we explore the electrochemical profiles of ionic liquid-based trivalent chromium electroplating systems, highlighting the strong dependence of the spectroscopic response and plating behavior on solution water content.
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Pennington, William, Madhushi Bandara, Andrew Peloquin, and Colin McMillen. "Where are the crystals? X-DES: Deep Eutectic Solvents based on Halogen Bonding." Structural Dynamics 12, no. 2_Supplement (2025): A134. https://doi.org/10.1063/4.0000443.

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As a crystallographer, nothing is sadder than failed crystal growth. As an “experienced” crystallographer (a basketball ref couldn't hand signal my number of years), I’ve thrown away more than my share of oily smudges (always according to established hazardous waste procedures, of course). Fortunately, my students are more curious than I. Recently we reported the first halogen-bonding-based deep eutectic solvent, which consisted of a mixture of 1,3-dithiane and o- diiodotetrafluorobenzene – a system that simply refused to cooperate during crystal growth (Peloquin et al. Angew Chem, Int. Ed.2021, 60, 22983–22989). Based on this result and memories of many other liquid samples, we have been exploring a number of different systems, most consisting of tetraalkylammonium triiodides with a variety of organoiodines. As it turns out, many of these systems that resist crystal growth are doing exactly what they are “supposed” to do. Most of these are pseudo binary systems with two or more eutectic points and at least one cocrystalline composition (see phase diagram below). The preparation and characterization of these systems by thermal analysis and, in the case of cocrystals, structural characterization will be discussed. Efforts to correlate halogen bonding in triiodide-based cocrystals with halogen bonding in triiodide-based deep eutectic solvents are now in progress.
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Park, Tae-Joon, and Sang Hyun Lee. "Deep eutectic solvent systems for FeCl3-catalyzed oxidative polymerization of 3-octylthiophene." Green Chemistry 19, no. 4 (2017): 910–13. http://dx.doi.org/10.1039/c6gc02789j.

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Dissertations / Theses on the topic "Deep eutectic solvent-based systems"

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Bezold, Franziska [Verfasser], Mirjana [Akademischer Betreuer] Minceva, Irina [Gutachter] Smirnova, Mirjana [Gutachter] Minceva, and Harald [Gutachter] Klein. "Deep eutectic solvent- and ionic liquid-based biphasic systems in centrifugal partition chromatography / Franziska Bezold ; Gutachter: Irina Smirnova, Mirjana Minceva, Harald Klein ; Betreuer: Mirjana Minceva." München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1203299745/34.

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Padmanabhan, Ramalekshmi Thanu Dinesh. "USE OF DILUTE HYDROFLUORIC ACID AND DEEP EUTECTIC SOLVENT SYSTEMS FOR BACK END OF LINE CLEANING IN INTEGRATED CIRCUIT FABRICATION." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202981.

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Fabrication of current generation integrated circuits involves the creation of multilevel copper/low-k dielectric structures during the back end of line processing. This is done by plasma etching of low-k dielectric layers to form vias and trenches, and this process typically leaves behind polymer-like post etch residues (PER) containing copper oxides, copper fluorides and fluoro carbons, on underlying copper and sidewalls of low-k dielectrics. Effective removal of PER is crucial for achieving good adhesion and low contact resistance in the interconnect structure, and this is accomplished using wet cleaning and rinsing steps. Currently, the removal of PER is carried out using semi-aqueous fluoride based formulations. To reduce the environmental burden and meet the semiconductor industry's environmental health and safety requirements, there is a desire to completely eliminate solvents in the cleaning formulations and explore the use of organic solvent-free formulations.The main objective of this work is to investigate the selective removal of PER over copper and low-k (Coral and Black Diamond®) dielectrics using all-aqueous dilute HF (DHF) solutions and choline chloride (CC) - urea (U) based deep eutectic solvent (DES) system. Initial investigations were performed on plasma oxidized copper films. Copper oxide and copper fluoride based PER films representative of etch products were prepared by ashing g-line and deep UV photoresist films coated on copper in CF4/O2 plasma. PER removal process was characterized using scanning electron microscopy and X-ray photoelectron spectroscopy and verified using electrochemical impedance spectroscopy measurements.A PER removal rate of ~60 Å/min was obtained using a 0.2 vol% HF (pH 2.8). Deaeration of DHF solutions improved the selectivity of PER over Cu mainly due to reduced Cu removal rate. A PER/Cu selectivity of ~20:1 was observed in a 0.05 vol% deaerated HF (pH 3). DES systems containing 2:1 U/CC removed PER at a rate of ~10 and ~20 Å/min at 40 and 70oC respectively. A mixture of 10-90 vol% de-ionized water (W) with 2:1 U/CC in the temperature range of 20 to 40oC also effectively removed PER. Importantly, etch rate of copper and low-k dielectric in DES formulations were lower than that in conventional DHF cleaning solutions.
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Kellat, Libby Nicole. "Model Chemistry Study Of Choline And Urea Based Deep Eutectic Solvents." Cleveland State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu1545074963407735.

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Fullarton, Claire. "Working towards a new sustainable rechargeable battery : zinc, conducting polymer and deep eutectic solvent system." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/31863.

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Electronically conducting polymers based on functionalised thiophenes and pyrroles have continued to stimulate academic interest as well as starting to be employed in practical applications and uses. This thesis describes studies of the electronic properties of mixed thiophene-pyrrole polymers (based on custom synthesised mixed monomer precursors) and polymers electrodeposited from commercially available monomers, pyrrole and 3,4-ethylenedioxythiophene, in respect to energy storage applications including batteries and ion selective membranes. In such applications the movement of ion and solvent through the polymer film during oxidation and reduction cycles is critical to application and function, e.g. charging rate, metal ion permeability or adhesion stability. Recently the unexpected behaviour of polypyrrole in choline chloride based ionic liquids has been described. These liquids are especially attractive because of their unique solubility profiles, high stability, low volatility and low toxicity. This thesis describes the electrochemical characterisation, DC capacitance behaviour and ion/solvent transport properties of conducting polymers using a range of electrochemical methodologies in combination with acoustic impedance electrochemical quartz crystal microbalance techniques (EQCM) and X-Ray Photo-electron Spectroscopy (XPS). The behaviour of several mixed thiophene-pyrrole films, polypyrrole and poly 3,4-ethylenedioxythiophene in different electrolyte media; deep eutectic solvents (DESs), conventional organic solvents and aqueous media are contrasted in this thesis. PEDOT and one of the mixed thiophene-pyrrole polymers (poly 2-(thiophene-2-yl)-1H pyrrole) gave the highest DC capacitances of the polymers investigated, with high values observed in both choline chloride based (Type III) and zinc based (Type IV) DESs. The ion dynamics of the polymers p-doping in the DESs, observed to fit gravimetric data recorded, was able to show a marked difference in the ion transfers between DES types and a conventional organic solvent, acetonitrile. Both polymers in acetonitrile and the zinc based DES (ZnCl2 / EG) satisfied the electro-neutrality condition through dominance of anion transfers. Whereas, polymers in the choline chloride based DES (Ethaline) satisfied the electro-neutrality condition through dominance of choline cation transfers (in the opposite direction to anion transfers). This research involved work towards the development of a new class of rechargeable batteries based on a Zinc-Polymer system incorporating a novel, inexpensive, environmentally sustainable solvent. This work is necessitated by the problems associated with petrol and diesel powered vehicles and the limitations of batteries available for electric vehicles.
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Orejuela, Lourdes Magdalena. "Lignocellulose deconstruction using glyceline and a chelator-mediated Fenton system." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/81255.

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Non-edible plant biomass (lignocellulose) is a valuable precursor for liquid biofuels, through the processes of pretreatment and saccharification followed by fermentation into products such as ethanol or butanol. However, it is difficult to gain access to the fermentable sugars in lignocellulose, and this problem is principally associated with limited enzyme accessibility. Hence, biomass pretreatments that destroy native cell wall structure and allows enzyme access are required for effective biomass conversion techniques. This research studied two novel pretreatment methods on two wood species: 1) a deep eutectic solvent (DES) that, under heat, swells lignocellulose and partially solubilizes cell wall materials by causing breakage of lignin-carbohydrate linkages and depolymerization of the biomass components, and 2) a chelator-mediated Fenton reaction (CMF) that chemically modifies the nanostructure of the cell wall through a non-enzymatic cell wall deconstruction. After pretreatment, utilizing analytical techniques such as nuclear magnetic spectroscopy, wide angle x-ray scattering, and gel permeation chromatography, samples were analyzed for chemical and structural changes in the solubilized and residual materials. After single stage DES (choline-chloride-glycerol) and two stage, CMF followed by DES pretreatments, lignin/carbohydrate fractions were recovered, leaving a cellulose-rich fraction with reduced lignin and hemicellulose content as determined by compositional analysis. Lignin and heteropolysaccharide removal by DES was quantified and the aromatic-rich solubilized biopolymer fragments were analyzed as water insoluble high molecular weight fractions and water-ethanol soluble low molecular weight compounds. After pretreatment for the hardwood sample, enzyme digestibility reached a saccharification yield of 78% (a 13-fold increase) for the two stage (DES/CMF) pretreated biomass even with the presence of some lignin and xylan remained on the pretreated fiber; only a 9-fold increase was observed after the other sequence of CMF followed by DES treatment. Single stage CMF treatment or single stage DES pretreatment improved 5-fold glucose yield compared to the untreated sample for the hardwood sample. The enhancement of enzymatic saccharification for softwood was less than that of hardwoods with only 4-fold increase for the sequence CMF followed by DES treatment. The other sequence of treatments reached up to 2.5-fold improvement. A similar result was determined for the single stage CMF treatment while the single stage DES treatment reached only 1.4-fold increase compared to the untreated softwood. Hence, all these pretreatments presented different degrees of biopolymer removal from the cell wall and subsequent digestibility levels; synergistic effects were observed for hardwood particularly in the sequence DES followed by CMF treatment while softwoods remained relatively recalcitrant. Overall, these studies revealed insight into two novel methods to enhance lignocellulosic digestibility of biomass adding to the methodology to deconstruct cell walls for fermentable sugars.<br>Ph. D.<br>Wood is a valuable material that can be used to produce liquid biofuels. Wood main components are biopolymers cellulose, hemicellulose and lignin that form a complex structure. Nature has locked up cellulose in a protective assembly that needs to be destroyed to gain access to cellulose, convert it to glucose and then ferment it to bioalcohol. This process is principally associated with limited enzyme accessibility. Therefore, biomass pretreatments that deconstruct native cell wall structure and allow enzyme access are required for effective biomass conversion techniques. This research studied two novel pretreatment methods on two wood species: 1) a deep eutectic solvent called glyceline that, under heat, swells wood and partially solubilizes cell wall materials by causing breakage of bonds and converting it into smaller molecules (monomers and oligomers), and 2) a chelator-mediated Fenton system (CMF) that chemically modifies the structure of the cell wall. Pretreatments were tested individually and in sequence in sweetgum and southern yellow pine. After pretreatments, utilizing analytical techniques, fractions were investigated for chemical and structural changes in the solubilized and residual materials. Treated wood samples were exposed to enzymatic conversion. A maximum 78% of glucose yield was obtained for the glyceline followed by CMF pretreated wood. For yellow pine only a 24% of glucose yield was obtained for the CMF followed by glyceline treatment. All these pretreatments presented different degrees of biopolymer removal from the cell wall and subsequent enzyme conversion levels. Overall, these studies revealed insight into two novel methods to enhance wood conversion adding to the methodology to deconstruct cell walls for fermentable sugars.
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Taubert, Jenny. "Use of Formulations Based On Choline Chloride-Malonic Acid Deep Eutectic Solvent for Back End of Line Cleaning in Integrated Circuit Fabrication." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/283692.

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Interconnection layers fabricated during back end of line processing in semiconductor manufacturing involve dry etching of a low-k material and deposition of copper and metal barriers to create copper/dielectric stacks. After plasma etching steps used to form the trenches and vias in the dielectric, post etch residues (PER) that consist of organic polymer, metal oxides and fluorides, form on top of copper and low-k dielectric sidewalls. Currently, most semiconductor companies use semi aqueous fluoride (SAF) based formulations containing organic solvent(s) for PER removal. Unfortunately, these formulations adversely impact the environmental health and safety (EHS) requirements of the semiconductor industry. Environmentally friendly "green" formulations, free of organic solvents, are preferred as alternatives to remove PER. In this work, a novel low temperature molten salt system, referred as deep eutectic solvent (DES) has been explored as a back end of line cleaning (BEOL) formulation. Specifically, the DES system comprised of two benign chemicals, malonic acid (MA) and choline chloride (CC), is a liquid at room temperature. In certain cases, the formulation was modified by the addition of glacial acetic acid (HAc). Using these formulations, selective removal of three types of PER generated by timed CF₄/O₂ etching of DUV PR films on Cu was achieved. Type I PER was mostly organic in character (fluorocarbon polymer type) and had a measured thickness of 160 nm. Type II PER was much thinner (25 nm) and consisted of a mixture of organic and inorganic compounds (copper fluorides). Further etching generated 17 nm thick Type III PER composed of copper fluorides and oxides. Experiments were also conducted on patterned structures. Cleaning was performed by immersing samples in a temperature controlled (30 or 40° C) double jacketed vessel for a time between 1 and 5 minutes. Effectiveness of cleaning was characterized using SEM, XPS and single frequency impedance measurements. Type II and III residues, which contained copper compounds were removed in CC/MA DES within five minutes through dissolution and subsequent complexation of copper by malonic acid. Removal of Type I PER required the addition of glacial acetic acid to the DES formulation. Single frequency impedance measurement appears to be a good in situ method to follow the removal of the residues. High water solubility of the components of the system in conjunction with their environmental friendly nature, make the DES an attractive alternative to SAF.
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Xie, Yuelin. "Electrodeposition of Co, Ni-based Alloys in Ionic Solutions and their Electrocatalytic Propert." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS560.

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Le développement de diverses applications utilisant l’hydrogène en tant que vecteur énergétique ouvre des voies prometteuses pour l'avenir. L’hydrogène peut être produit de différentes manières, l’une d’entre elles est l’électrolyse de l’eau et plus particulièrement sa réduction qui conduit à la production d’hydrogène (connue sous le nom de Hydrogen Evolution Reaction, HER). Cette technique nécessite l’emploi d’électrocatalyseurs performants. À l'heure actuelle, les catalyseurs à base d'alliages ou de composés de métaux nobles se distinguent par leur rendement électrocatalytique exceptionnel dans le cadre de la production d'hydrogène. Cependant, leur coût élevé et leurs réserves limitées compliquent leur utilisation à grande échelle dans l'industrie. C'est pourquoi il est impératif de concevoir et de développer de nouveaux matériaux permettant de produire de l'hydrogène économiques et respectueux de l'environnement. Ces dernières années, de nouveaux matériaux, notamment les alliages à base de métaux de transition tels que le nickel (Ni) et le cobalt (Co), ont été proposés et ont démontré d'excellentes propriétés catalytiques. Cependant, réduire davantage les coûts de préparation tout en améliorant les performances catalytiques et en respectant l'environnement s'avère être un défi de taille. C'est pourquoi, dans cette étude, nous mettrons l'accent sur la préparation d'alliages par électrodépôt, une méthode économique, et nous explorerons les effets de la composition élémentaire, de la structure de phase et de la morphologie de surface sur les performances électrocatalytiques. Au cours du processus d'électrodéposition, nous employons des électrolytes non conventionnels, communément désignés sous l'appellation de liquides ioniques. Comparativement aux solutions aqueuses, ces liquides ioniques présentent une teneur en eau considérablement moindre. Cette particularité sert à réduire la formation d'oxydes de métaux de transition. Par ailleurs, les liquides ioniques se caractérisent par une fenêtre électrochimique élargie, ce qui élargit notre éventail d'options en termes d'éléments d'alliage. Cette diversification nous autorise à scruter l'influence de divers éléments sur les performances de l'évolution de l'hydrogène, offrant ainsi des perspectives précieuses. De plus, la surface spécifique de l'électrocatalyseur joue un rôle central dans l'incidence sur les performances de la génération d'hydrogène. Une méthode connue sous l'appellation de désalliage est employée pour éliminer sélectivement une fraction des éléments d'alliage, ce qui conduit à la formation d'une structure nanoporeuse. Cette modification accroît davantage la surface spécifique du matériau. Nous avons mené avec succès l'électrodépôt d'alliages à base de Ni/Co dans des liquides ioniques ou des solvants eutectiques profonds (DES) en vue de préparer des électrocatalyseurs, puis nous les avons soumis à un traitement de surface par désalliage, fournissant ainsi de nouvelles informations sur le développement de matériaux pour la production d'hydrogène<br>The use of fossil energy, one of the main contributors to carbon emissions and a major source of pollution, has become a hot topic of discussion in recent years. Predicted energy shortages and the resulting environmental challenges are forcing mankind to look for alternatives to fossil fuels. Hydrogen is attracting increasing attention as a clean energy source, with high energy density and minimal emissions. It represents a promising, low-carbon energy carrier ready to supplant fossil fuels, particularly in the demanding industrial and transport sectors, where decarbonization is particular difficult to implement. According to existing literature, there are three main methods for producing hydrogen: hydrogen production from (i) fossil fuels, (ii) gasification, and (iii) water splitting. Water electrolysis under renewable resource conditions can practically eliminate carbon emissions, which is a significant difference compared to hydrogen production from fossil fuels (66 gCO2 e/MJ) or gasification (55 gCO2 e/MJ). Clearly, hydrogen production by electrolysis under ideal conditions has the distinct advantage of being environmentally friendly, with a low carbon footprint. Furthermore, water electrolysis offers many advantages, including the production of high-purity hydrogen, the simultaneous production of oxygen as a by-product, and simple installation. Although the hydrogen evolution reaction (HER) by water electrolysis provides numerous advantages for hydrogen production applications, its industrial adoption remains relatively limited, especially behind the production of hydrogen from fossil fuels. One of the main obstacles to its widespread use is the choice of electrocatalytic materials. Precious metals have exceptional electrocatalytic properties; however, their high cost and limited abundance on earth limit their practical application in all industries. Consequently, the search for cost-effective alternatives involving transition metals and the improvement of electrocatalyst performance through alloying and adjustments of surface morphology has emerged as important and dynamic lines of research. A wide range of techniques have been explored for synthesizing transition metal alloys used in electrocatalytic HER. Among these methods, electrodeposition stands out for its streamlined process, ease of implementation, and precise control, making it a versatile choice for large-scale applications. However, the hydrolysis of water during electrodeposition poses a problem. This can be effectively resolved by employing ionic liquids (ILs) as electrolytes, which are becoming increasingly popular due to their wide electrochemical window, high ionic conductivity, and user-friendly characteristics arising from their non-volatile and non-flammable nature. Surprisingly, research on the electrodeposition of alloys in ionic liquids remains relatively scarce. Consequently, combining the electrodeposition of alloy electrocatalysts with ionic liquids represents an attractive avenue to explore. In this work, we address the following questions: (1) Is it possible to prepare transition metal-based alloys by electrodeposition in ionic liquids? (2) What kinds of alloys can be prepared by electrodeposition in ionic liquids? (3) What is the impact of other elements (Co, Zn, Cu) on the HER properties of alloys? (4) How can the HER properties of alloys be enhanced by surface modification (dealloying)?
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Ojala, J. (Jonna). "Functionalized cellulose nanoparticles in the stabilization of oil-in-water emulsions:bio-based approach to chemical oil spill response." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526222417.

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Abstract Nanocellulose is a renewable, biodegradable, and easily available material that is considered as an attractive resource for many different value-added applications in the emerging bio-based economy. Its outstanding properties, such as strength, lightness, transparency, and good thermal insulation, have inspired research and product development around nanocellulose. The potential of nanocellulose to replace synthetic chemicals made from non-renewable sources, for example, is considered to be very promising. Chemical functionalization, that is, the modification of the cellulosic surface properties, is seen to be beneficial in applications such as those in which higher hydrophobicity is needed. In this thesis, the ability of cellulose nanoparticles to stabilize oil droplets in oil-in-water emulsions was studied. The aim of the study was to explore the possibility of developing a new type of "green" oil spill chemical from cellulose. Therefore, the cellulose was chemically modified in an aquatic environment with a sequential periodate oxidation and chlorite oxidation followed by reductive amination reaction, which increased the hydrophobicity of the produced nanocellulose. In addition, the use of deep-eutectic solvents in the preparation of modified (succinylated and carboxylated) and non-modified cellulose nanoparticles was studied. Chemical (kraft) pulp, dissolving pulp, and semi-chemical fine fibers were used as raw materials in this research. The results demonstrated that chemically modified cellulose nanoparticles work well as stabilizers for oil-water emulsions resulting in small, stable oil droplets and impeding creaming, which is a typical phenomenon for particle stabilized emulsions. The modification of cellulose nanoparticles improved their ability to partition at the oil-water interface, which enabled efficient and irreversible adsorption. It was found that because of their small size, the cellulose nanocrystals can be compressed more tightly onto the surface of the oil droplet, while longer and more flexible cellulose nanofibrils formed a web structure between the oil droplets. All cellulose nanoparticle-stabilized emulsions were stable against droplet coalescence, and even at low temperatures, they retained their droplet size and stability. Salinity, on the other hand, improved stability when CNCs from chemical pulp were used, but it negatively affected stability when nanocrystals from semichemical pulp were used<br>Tiivistelmä Uusiutuva, biohajoava ja helposti saatavilla oleva nanoselluloosa on merkittävä tulevaisuuden raaka-aine useissa erilaisissa käyttökohteissa. Sen ylivertaiset ominaisuudet, kuten lujuus, keveys, läpinäkyvyys ja lämmöneristävyys ovat olleet innoittamassa nanoselluloosan tutkimusta ja tuotekehitystä. Nanoselluloosan mahdollisuuksia ja käyttöä eri sovelluksissa korvaamaan esimerkiksi uusiutumattomista luonnonvaroista valmistettuja kemikaaleja, pidetään erittäin lupaavina. Kemiallisesta funktionalisoinnista eli selluloosan pintaominaisuuksien muokkauksesta nähdään olevan hyötyä, kun tavoitellaan nanoselluloosan toiminnallisuutta esimerkiksi hydrofobista luonnetta vaativissa sovelluksissa pinta-aktiivisen aineen tavoin. Tässä työssä tutkittiin erityisesti nanoselluloosapartikkeleiden kykyä stabiloida öljypisaroita dieselöljy-vesiemulsioissa. Tutkimuksen päämääränä oli selvittää mahdollisuutta kehittää uudentyyppistä, ”vihreää” öljyntorjuntakemikaalia selluloosasta. Tämän vuoksi selluloosaa muokattiin kemiallisesti vesiympäristössä yhdistetyllä hapetus- ja aminointikäsittelyllä, mikä lisäsi valmistetun nanoselluloosan hydrofobisuutta. Toisena käsittelyvaihtoehtona tutkittiin syväeutektisten liuottimien käyttöä sekä muokattujen (sukkinyloidut ja karboksyloidut) että muokkaamattomien nanoselluloosapartikkeleiden valmistuksessa. Raaka-aineina työssä käytettiin kemiallista sellumassaa, liukosellua sekä puolikemiallista hienokuitua. Työn tuloksena voidaan todeta, että nanoselluloosasta valmistetut kemiallisesti muokatut (funktionalisoidut) nanopartikkelit toimivat hyvin öljy-vesiemulsiossa estäen emulsion öljypisaroiden yhteensulautumista. Nanopartikkelit stabiloivat emulsiossa olevan öljyn hyvin pieniksi pisaroiksi hidastaen kermottumista eli emulsion yleistä faasierottumista. Nanoselluloosan funktionalisointi paransi sen kykyä hakeutua öljy-vesi rajapintaan, mahdollistaen tehokkaan ja palautumattoman adsorption. Havaittiin, että pienen kokonsa vuoksi selluloosananokiteet pystyivät pakkautumaan tiiviimmin öljyn pinnalle, kun taas selluloosananokuidut, jotka ovat pidempiä, muodostivat verkkomaisen rakenteen myös öljypisaroiden väliin. Suolan lisäys vaikutti emulsion stabiilisuuteen vaihtelevasti eri näytteiden välillä, kun taas kylmät olosuhteet poikkeuksetta paransivat stabiilisuutta
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Mahipal. "Surfactant and dye aggregation within deep eutectic solvent-based systems." Thesis, 2018. http://localhost:8080/iit/handle/2074/7734.

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Dong, Ji-Yao, and 董繼堯. "An Antisolvent Approach to Nanostructure ZnO Using Choline Chloride Based Deep Eutectic Solvent." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/27413680483977606118.

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博士<br>國立清華大學<br>化學工程學系<br>99<br>In this article, we demonstrate a new, facile and green antisolvent process to prepare nanostructure ZnO. The deep eutectic solvent (DES) is a new class green solvent that is negligible vapor pressure, high polar and biocompatible. UCC is one of DES that shows high solubility of many metal oxides that can be used as solvent in this approach. The antisolvent should be miscible with the DES UCC and non-solvent for the solute. By controlling the nucleation and growth, various morphologies of ZnO can be made by this method. At low ZnO concentration in UCC, ZnO twin-cone and rods can be prepared with morphology and size controls by injection rate and the ethanol content in antisolvent. The ethanol in the antisolvent can reduce the growth rate of ZnO and also lower the product dimensions. If the injection rate of ZnO-containing DES was reduced, the supply of Zn source became limited and the crystal growth became 1D dominated and grows on the preferred direction. It turns the product structure from twin-cones to nanorods. Mesocrystal ZnO is a mesoporous material fabricated from nanocrystals (NCs) with ordered orientation superstructure. Thus the material possesses high surface area and good crystallinity as single crystal. We use a biological buffer Tris as an oriented agent in antisolvent. ZnO NCs were made in antisolvent then Tris can increase the concentration of hydroxyl group in antisolvent. The hydroxyl group can attach on the oxygen vacancies on the polar O-terminated surface then increased the polarity of the ZnO NCs and then be attached together with the same orientation to form a mesocrystal ZnO. The increasing amount of Tris can make a larger size, better crystallinity and smaller surface area mesocrystal ZnO. The crystallinity is the more important factor rather than surface area. Thus a mesocrystal ZnO prepared in high Tris concentration shows better photocatalytic reactivity. At high ZnO dissolved concentration and low injection rate, the ZnO-ZCH nanosheet can be made by this antisolvent approach. After the annealing, single crystal mesoporous ZnO nanosheet can be parpared. The sheet is thin with a thickness of 10 nm and many pores with size of 5-60 nm can be found on the nanosheets. The ZnO nanosheet is single crystal and high surface area (~90 m2/g) with the exposed plane of (11-20). It can be used as photocatalyst for degradation of methylene blue (MB) in aqueous solution. The single crystal mesocrystal ZnO nanosheet shows performance as good as TiO2 P25.
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Book chapters on the topic "Deep eutectic solvent-based systems"

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Ramezani, Amir M., Yadollah Yamini, and Raheleh Ahmadi. "Deep Eutectic Solvent-Based Microextraction." In Microextraction Techniques in Analytical Toxicology. CRC Press, 2021. http://dx.doi.org/10.1201/9781003128298-14.

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Shahbaz, K., I. M. AlNashef, R. J. T. Lin, M. A. Hashim, F. S. Mjalli, and Mohammed Farid. "A Novel Calcium Chloride Hexahydrate-Based Deep Eutectic Solvent as a Phase Change Material." In Thermal Energy Storage with Phase Change Materials. CRC Press, 2021. http://dx.doi.org/10.1201/9780367567699-5.

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Zulkiflee, Zaidatul Nadiah, Nor Helya Iman Kamaludin, and Hakimah Osman. "Effect of Glycerol-Based Deep Eutectic Solvent Pretreatment on the Cellulose Yield from Coconut Mesocarp." In Green Energy and Technology. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-3785-0_36.

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Ejeromedoghene, Onome, Moses Kumi, and Ephraim Akor. "Deep eutectic solvent (DES)-polymer hybrid systems as tools in drug delivery." In Deep Eutectic Solvents. Elsevier, 2025. https://doi.org/10.1016/b978-0-443-21962-7.00002-x.

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Chai, Sophie Jing Nee, Xiao-Qian Fu, Dong-Qiang Lin, and Pau Loke Show. "Sugar-based deep eutectic solvent-aqueous two-phase system." In Principles of Multiple-Liquid Separation Systems. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-91728-5.00016-0.

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Trivedi, Shruti, Shreya Juneja, Vaishali Khokhar, and Siddharth Pandey. "Solvation within deep eutectic solvent-based systems: A review." In Green Sustainable Process for Chemical and Environmental Engineering and Science. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-95156-2.00013-1.

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Song, Zhen, Teng Zhou, Zhiwen Qi, and Kai Sundmacher. "Computer-Aided Screening of Deep Eutectic Solvent Systems for the Associative Extraction of α-Tocopherol from Deodorizer Distillate." In 31st European Symposium on Computer Aided Process Engineering. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-323-88506-5.50054-1.

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"Avoid Auxiliaries." In Green Chemistry: Principles and Case Studies. The Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/bk9781788017985-00125.

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Auxiliaries are chemicals other than reactants or catalysts required for a reaction or purification. Solvents, extraction chemicals, and chromatography adsorbents are all auxiliaries that should be minimized in greener chemical processes. Solvent characteristics to be considered in choosing a greener solvent are: (1) flammability, (2) toxicity, (3) reactivity, (4) environmental degradability, and (5) energy required for evaporation (boiling point). Auxiliaries should be minimized or eliminated to minimize risk. High-speed ball-milling and twin-screw extraction have been used to eliminate solvents in both inorganic and organic reactions. Solvent-free chemistry is the safest, greenest choice. Eastman eliminated solvents from a process to make cosmetic esters with immobilized enzymes. Greener substitutes for solvents are renewable solvents, water, supercritical CO2, and ionic liquids. Water can be a greener solvent in many cases, though it is energy intensive to evaporate. Supercritical CO2 has been used as a solvent in diverse chemical reactions—hydrogenation of isophorone was described as an example. Astra-Zeneca scaled up chiral separations using scCO2. Ionic liquids based on choline are non-toxic, room temperature liquids that have been used as solvents. The deep eutectic solvent, choline chloride–glycerol, was an excellent solvent for processing biomass.
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Peñas-Núñez, S. J., D. Mecerreyes, and M. Criado-Gonzalez. "Emerging Developments and Prospects of Injectable Smart Hydrogels for Bioelectronics." In Injectable Smart Hydrogels for Biomedical Applications. Royal Society of Chemistry, 2024. http://dx.doi.org/10.1039/bk9781837673070-00096.

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Soft matter bioelectronics is an emergent and multidisciplinary research field that seeks to exploit biology in conjunction with electronics for diagnostic and healthcare treatments. In this regard, this chapter describes the synthesis, characterization, and applications of electroactive injectable polymer hydrogels, which can be formed by conducting polymer-based networks or hybrid networks of polymers containing conductive nanomaterials crosslinked through physical interactions or dynamic covalent bonds. Besides, the recent developments of emerging ionic liquid integrated gels (iongels) and deep eutectic solvent integrated gels (eutectogels) are also discussed, which opens new research perspectives to be explored in the coming years. Finally, the employment and prospects of electroactive injectable hydrogels, iongels, and eutectogels in the foremost bioelectronic applications, ranging from tissue engineering to biosensing, are outlined.
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Kruber, Kai Fabian, Mariann Kroll, Christoph Held, and Mirko Skiborowski. "Evaluation of the potential of a deep eutectic solvent for liquid-liquid extraction of furfural using optimization-based process design." In Computer Aided Chemical Engineering. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-443-15274-0.50152-9.

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Conference papers on the topic "Deep eutectic solvent-based systems"

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Medina, Edgar Ivan Sanchez, Ann-Joelle Minor, and Kai Sundmacher. "Systematic comparison between Graph Neural Networks and UNIFAC-IL for solvent pre-selection in liquid-liquid extraction." In The 35th European Symposium on Computer Aided Process Engineering. PSE Press, 2025. https://doi.org/10.69997/sct.132577.

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Solvent selection is a critical decision-making process that balances economic, environmental, and societal factors. The vast chemical space makes evaluating all potential solvents impractical, necessitating pre-selection strategies to identify promising candidates. Predictive thermodynamic models, such as the UNIFAC model, are commonly used for this purpose. Recent advancements in deep learning have led to models like the Gibbs-Helmholtz Graph Neural Network (GH-GNN), which overall offers higher accuracy in predicting infinite dilution activity coefficients over a broader chemical space than UNIFAC. This study presents a systematic comparison of solvent pre-selection using GH-GNN and UNIFAC-IL in the context of liquid-liquid extraction. The original GH-GNN model is extended to simultaneously predict organic and ionic systems. This extended GH-GNN model predicts more than 92 % of the logarithmic IDACs with an absolute error of less than 0.3. By comparison, UNIFAC-based models only achieve such accuracy for less than 65 %. A case study is used involving the ionic liquid ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) and caprolactam, relevant for the solvolytic depolymerization of polyamide 6. Results indicate a significant correlation in solvent rankings across both methods, with a Spearman�s coefficient of 0.62, suggesting that deep learning-based models like GH-GNN are viable alternatives for solvent pre-selection. Additionally, chemical similarity metrics, such as Tanimoto similarity, can assess confidence in solvent rankings, allowing users to determine acceptable risk levels in predictions across a vast chemical space.
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Vicent, Ezequiel. "Improve Atmospheric Columng Overhead Corrosion Mitigation through Cloud-Based, Continuous Salt Point Corrosion Monitoring." In MECC 2023. AMPP, 2023. https://doi.org/10.5006/mecc2023-19941.

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Abstract Atmospheric Crude Unit Overheads are highly susceptible to corrosion and fouling due to the inefficient removal of chlorides in the desalter and subsequent hydrochloric acid (HCl) generation in the crude furnace. Refiners apply neutralizing amines to raise the condensed phase pH and add water wash (if an injection system exists) to wash away salts that may form and prevent corrosion. Understanding the overhead chemistry as it relates to the temperature and pressure conditions that dictate the targeted product (gasoline or diesel mode) is crucial to maintain an on-stream factor of 95% or better. Operating the overhead in ranges where an acidic ionic slurry forms (salt point corrosion) or where solid salts are allowed to form and deposit (corrosion and fouling) can lead to unexpected shutdowns. Such an unexpected shutdown may last an average of 7 to14 days, corresponding to a 4% reduction in the unit’s annual onstream factor. For a 150 kbpd unit with a crack spread of $10/bbl, this amounts to an $11MM USD to $21MM USD loss in revenue. For example, a refinery in the US [1] shut down its small CDU, which processes 80 kbpd of crude. The refinery shut down the unit on July 9, 2018 and expected the downtime to last until July 25, 2018 for a duration of 16 days and revenue loss of 12.8 MMUSD (assuming the crack spread is $10/bbl). Eliminating, mitigating, or even reducing this risk allows refiners to avoid these unplanned shutdowns and profit losses. In this paper, we discuss why deep electrolyte and ionic modeling are critical for rigorous and accurate ionic dew point and salt deposition predictions. We will discuss how the OLI’s Mixed Solvent Electrolyte (MSE) thermodynamic model, now accessible through OLI’s cloud APIs, can be adapted to automatically calculate the performance of neutralizing amines in multi-phase systems while adapting to the effects of changing operating conditions. We will also discuss how these models for continuous corrosion monitoring and mitigation will enable rapid and cost-effective response and empower operational asset management through digital transformation of this critical unit.
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Šalić, Anita, Anabela Ljubić, and Bruno Zelić. "Development of Aqueous Two-Phase Systems Based on Deep Eutectic Solvents for Continuous Protein Extraction in A Microextractor." In Micromachines 2021 — 1st International Conference on Micromachines and Applications (ICMA2021). MDPI, 2021. http://dx.doi.org/10.3390/micromachines2021-09546.

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Niawanti, Helda, Siti Zullaikah, and M. Rachimoellah. "Purification of biodiesel by choline chloride based deep eutectic solvent." In INTERNATIONAL SEMINAR ON FUNDAMENTAL AND APPLICATION OF CHEMICAL ENGINEERING 2016 (ISFAChE 2016): Proceedings of the 3rd International Seminar on Fundamental and Application of Chemical Engineering 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4982280.

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Weeraratne, S. D., I. A. G. Pieterzs, and D. S. Gunarathne. "Modeling Deep Eutectic Solvent Based Working Fluids for Vapor Absorption Cooling." In 2023 Moratuwa Engineering Research Conference (MERCon). IEEE, 2023. http://dx.doi.org/10.1109/mercon60487.2023.10355395.

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Gojun, Martin, Sara Anđelović, Marko Božinović, et al. "Purification of biodiesel produced by lipase catalysed transesterification by two-phase systems based on deep eutectic solvents in a microextractor: Selection of solvents and process optimization." In Micromachines 2021 — 1st International Conference on Micromachines and Applications (ICMA2021). MDPI, 2021. http://dx.doi.org/10.3390/micromachines2021-09592.

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Taslim, Leonardo Indra, Renita Manurung, Agus Winarta, and Debbie Aditia Ramadhani. "Biodiesel production from ethanolysis of DPO using deep eutectic solvent (DES) based choline chloride – ethylene glycol as co-solvent." In PROCEEDINGS FROM THE 14TH INTERNATIONAL SYMPOSIUM ON THERAPEUTIC ULTRASOUND. Author(s), 2017. http://dx.doi.org/10.1063/1.4978079.

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Othman, Zetty Shafiqa, Nur Hasyareeda Hassan, and Saiful Irwan Zubairi. "Alcohol based-deep eutectic solvent (DES) as an alternative green additive to increase rotenone yield." In THE 2015 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4931283.

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Ovsyannikova, V. S., and A. G. Shcherbakova. "Influence of composition based on deep eutectic solvent on biodestruction of oils of different composition." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE “PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY”. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0084751.

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Al-Weheibi, I., R. Al-Hajri, Y. Al-Wahaibi, B. Jibril, and A. Mohsenzadeh. "Oil Recovery Enhancement in Middle East Heavy Oil Field using Malonic Acid based Deep Eutectic Solvent." In SPE Middle East Oil & Gas Show and Conference. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/172592-ms.

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