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Literatura académica sobre el tema "Glycerol system"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 12 de febrero de 2022

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Artículos de revistas sobre el tema "Glycerol system"

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Esteban, Jesús, Miguel Ladero, Laura Molinero y Félix García-Ochoa. "Liquid–liquid equilibria for the ternary systems DMC–methanol–glycerol, DMC–glycerol carbonate–glycerol and the quaternary system DMC–methanol–glycerol carbonate–glycerol at catalytic reacting temperatures". Chemical Engineering Research and Design 92, n.º 12 (diciembre de 2014): 2797–805. http://dx.doi.org/10.1016/j.cherd.2014.05.026.

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Wang, Xiaoli, Gongde Wu, Tongfa Jin, Jie Xu y Shihao Song. "Selective Oxidation of Glycerol Using 3% H2O2 Catalyzed by Supported Nano-Au Catalysts". Catalysts 8, n.º 11 (29 de octubre de 2018): 505. http://dx.doi.org/10.3390/catal8110505.

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A series of transition metal oxides or mixed oxides supported nano-Au catalysts were prepared for the selective oxidation of glycerol to glyceric acid using 3% H2O2. It was found that the composition and structure of supports significantly influenced the catalytic performance of catalysts. The mesoporous trimetal mixed oxide (CuNiAlO) supported nano-Au catalysts were more active in comparison with the others. In the present catalytic system, the highest glycerol conversion was 90.5%, while the selectivity of glyceric acid could reach 72%. Moreover, the catalytic performance remained after 11 times of reaction.

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Friberg, Stig E., Irena Blute y Per Stenius. "Foam stability in a glycerol system". Journal of Colloid and Interface Science 127, n.º 2 (febrero de 1989): 573–82. http://dx.doi.org/10.1016/0021-9797(89)90062-3.

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4

Wiguno, Annas, Asalil Mustain, Wahyu Fazar Eka Irwansyah y Gede Wibawa. "Isothermal Vapor-Liquid Equilibrium of Methanol + Glycerol and 1-Propanol + Glycerol". Indonesian Journal of Chemistry 16, n.º 1 (15 de marzo de 2018): 111. http://dx.doi.org/10.22146/ijc.21186.

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Isothermal vapor-liquid equilibrium (VLE) data for two binary mixtures of methanol + glycerol and 1-propanol + glycerol were determined at the temperature range from (313.15 to 363.15) K using a simple quasi-static ebulliometer. All systems showed that the vapor pressures increased with increasing alcohols (methanol or 1-propanol) concentrations at corresponding system. The Wilson, Non-Random Two-Liquid (NRTL) and Universal Quasi-Chemical (UNIQUAC) activity coefficient models were used to correlate the experimental data. Both systems showed slightly deviations from the ideal liquid phase behavior.

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5

Zhao, Gang, Xiaojie Guo, Liqun He, Zhong Liu y Dayong Gao. "Comparative study of glass transformation of glycerol–H2O–NaCl ternary system and glycerol–PBS complex system". Thermochimica Acta 419, n.º 1-2 (septiembre de 2004): 131–34. http://dx.doi.org/10.1016/j.tca.2004.02.007.

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6

Li, Jingjing, Richard D. Pancost, B. David A. Naafs, Huan Yang, Cheng Zhao y Shucheng Xie. "Distribution of glycerol dialkyl glycerol tetraether (GDGT) lipids in a hypersaline lake system". Organic Geochemistry 99 (septiembre de 2016): 113–24. http://dx.doi.org/10.1016/j.orggeochem.2016.06.007.

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Avila-Stagno, Jorge, Alexandre V. Chaves, Gabriel O. Ribeiro, Emilio M. Ungerfeld y Tim A. McAllister. "Inclusion of glycerol in forage diets increases methane production in a rumen simulation technique system". British Journal of Nutrition 111, n.º 5 (7 de octubre de 2013): 829–35. http://dx.doi.org/10.1017/s0007114513003206.

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We hypothesised that the inclusion of glycerol in the forage diets of ruminants would increase the proportion of propionate produced and thereby decreasein vitroCH4production. This hypothesis was examined in the present study using a semi-continuous fermentation system (rumen simulation technique) fed a brome hay (8·5 g) and maize silage (1·5 g) diet with increasing concentrations (0, 50, 100 and 150 g/kg DM) of glycerol substituted for maize silage. Glycerol linearly increased total volatile fatty acids production (P< 0·001). Acetate production was quadratically affected (P= 0·023) and propionate and butyrate production was linearly increased (P< 0·001). Glycerol linearly increased (P= 0·011) DM disappearance from hay and silage. Crude protein disappearance from hay was not affected (P= 0·789), but that from silage was linearly increased (P< 0·001) with increasing glycerol concentrations. Neutral-detergent fibre (P= 0·040) and acid-detergent fibre (P= 0·031) disappearance from hay and silage was linearly increased by glycerol. Total gas production tended to increase linearly (P= 0·061) and CH4concentration in gas was linearly increased (P< 0·001) by glycerol, resulting in a linear increase (P< 0·001) in mg CH4/g DM digested. Our hypothesis was rejected as increasing concentrations of glycerol in a forage diet linearly increased CH4production in semi-continuous fermenters, despite the increases in the concentrations of propionate. In conclusion, this apparent discrepancy is due to the more reduced state of glycerol when compared with carbohydrates, which implies that there is no net incorporation of electrons when glycerol is metabolised to propionate.

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Raden Siti Amirah, Hambali, Ahmad Faiza Mohd, Mohd Firdaus Yhaya, Rahmah Mohamed y Mohamed Nur Raihan. "The Effect of Glycidyl Silane as Coupling Agent in Intumescent Flame Retardant System". Advanced Materials Research 664 (febrero de 2013): 677–82. http://dx.doi.org/10.4028/www.scientific.net/amr.664.677.

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The effect of different carbonizing agents; ethylene glycol, glycerol, and pentaerythritol to the char formation were studied in this research. After burning process, formulation with ethylene glycol, glycerol, and pentaerythritol showed chars thickness of 10 mm, 32 mm, and 45 mm. The chars’ strength at peak force was recorded at 3.20 N, 7.75 N, and 9.48 N while the burning rate of each sample were 5.23 x 10-4 mm/s, 4.20 x10-4 mm/s, and 6.24 x10-4 mm/s respectively. Formulation with glycerol as carbonizing agent showed the lowest burning rate as compared to the other formulations. Additional formulation with glycidyl silane as coupling agent in glycerol formulation was also studied. The formation of chemical bonding between silane, glycerol, and epoxy glycerol was confirmed by Fourier Transform Infrared (FTIR) absorption peak at 767.25 cm-1. The burning rate was 1.44 x 10-5 mm/s after silane treatment. Thermal degradation of the silane-treated resin started at 220°C as measured by thermogravimetric analysis (TGA).

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Hu, Jianglin, Yanlong Gu, Zhenhong Guan, Jinjin Li, Wanling Mo, Tao Li y Guangxing Li. "An Efficient Palladium Catalyst System for the Oxidative Carbonylation of Glycerol to Glycerol Carbonate". ChemSusChem 4, n.º 12 (16 de noviembre de 2011): 1767–72. http://dx.doi.org/10.1002/cssc.201100337.

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Loomis, Shannon E., James M. Russell, Ana M. Heureux, William J. D’Andrea y Jaap S. Sinninghe Damsté. "Seasonal variability of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in a temperate lake system". Geochimica et Cosmochimica Acta 144 (noviembre de 2014): 173–87. http://dx.doi.org/10.1016/j.gca.2014.08.027.

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Tesis sobre el tema "Glycerol system"

1

Laudon, Meyer Eva. "Studies of lipolysis and neuroendocrine rhythms in cluster headache /". Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-845-2/.

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Ingfeldt, Isac. "Evaluation of Carbon Source Addition on Denitrification Efficiency : A study in a continuous biological leachate water treatment system". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278587.

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In 2014 SÖRAB constructed a continuous biological treatment system (KBR) to handle leachate waterfrom the landfill at the facility in Löt, north of Stockholm. The KBR is mainly focused on removal ofammonium nitrogen which would otherwise be released in to the recipient and contribute toeutrophication and damage to the environment. This project has focused on replacing the currentcarbon source in the process Brenntaplus VP1 and evaluating the efficiency of denitrification andeconomy of transitioning to a new carbon source. The carbon sources glycerol and ethanol wereevaluated and compared to Brenntaplus VP1 for the denitrification efficiency and microbial profile.The experiments were performed in laboratory conditions and in pilot scale using leachate water fromLöt. The reduction of ammonia was evaluated by chemical precipitation, addition of carbon sources bymeasuring ammonia-N and nitrate-N under aerobic (nitrification) and anaerobic (denitrification)conditions. The combination of ethanol and glycerol showed an enhanced denitrification and increasedmicrobial community both in lab and pilot scale studies with reduced hydraulic retention time. Therate of nitrate reduction was 0.23 mgNO3-N 1 -1 h -1 for ethanol/glycerol compared to 0.12-0.17mgNO 3- -N 1 -1 h -1 for Brenntaplus VP1 in pilot scale. The results indicate that using ethanol, glycerolor a mix of the two as a substitute for Brenntaplus VP1 is viable. This has been based on laboratoryand pilot scale studies. Each of the carbon sources examined during this project have showed a uniqueimpact on the process and its parameters such as: denitrification rate, microbial density and microbialcomposition. The carbon sources had an impact with temperature fluctuation and faster denitrificationcompared to the conventional KBR system. This implies that the carbon sources tested in this projectcan be advantageous and beneficial for Sörab depending on the carbon source availability and theseasonal variations.
Under 2014 konstruerade SÖRAB ett kontinuerligt biologiskt reningsverk (KBR) för att hanteralakvatten från deponin för ickefarligt avfall vid anläggningen i Löt, norr om Stockholm. KBR ärfrämst konstruerad för rening av ammoniumkväve som annars skulle släppas ut till recipienten ochbidra till övergödning och skador på miljön i området. Detta projekt har fokuserat på att ersätta dennuvarande kolkällan Brenntaplus VP1 som används i processen och utvärdera effektiviteten idenitrifieringen samt ekonomin vid övergång till en ny kolkälla. Kolkällorna glycerol och etanol varde kolkällor som valdes för utvärdering i detta projekt, dessa jämfördes med Brenntaplus VP1 i desseffekt på denitrifikationseffektivitet och mikrobiell sammansättning under laboratorieförhållanden ochi pilotskala. Möjligheten att reducera ammoniumkoncentrationen i lakvattnet utvärderades genomkemisk fällning och genom mätning av ammoniumkväve och nitratkväve under aeroba (nitrifikation)och anaeroba (denitrifikation) förhållanden. Kombinationen av etanol och glycerol indikerade enförbättrad denitrifikation och ökad mikrobiell densitet både i laboratorie- och pilotskala med reduceradhydraulisk retentionstid. Nitratreduktionshastigheten var 0,23 mgNO 3- -N 1 -1 h -1 för blandningen avetanol/glycerol jämfört med 0,12 - 0,17 mgNO 3- -N 1 -1 h -1 för Brenntaplus VP1 i pilotskala. Resultatenindikerar att användning av etanol, glycerol eller en blandning av de två har goda förutsättningar föratt ersätta Brenntaplus VP1. Var och en av de tre kolkällorna som undersöktes under detta projekt harvisat en unik inverkan på processen och dess parametrar såsom: denitrifikationshastighet, mikrobielldensitet och mikrobiell sammansättning. Genom att byta kolkälla i KBR kan prestandan ökas genomatt minska den hydrauliska retentionstiden samtidigt som systemet tycks bli mindre känsligt förtemperatursvängningar. Kolkällorna som utvärderats i detta projekt kan därför vara fördelaktiga för SÖRAB beroende på dess tillgänglighet och pris.

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Bulnes, Kevin, Diego Paredes y Leonardo Vinces. "An Automatic Biodiesel Decanting System for the Optimization of Glycerin Separation Time by Applying Electric Field and Temperature". Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/653784.

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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.
During biodiesel production, crude biodiesel and glycerin are separated in resting tanks due to gravity and differences in density, glycerin accumulates at the base of the contender; such operation is called decantation. The decantation stage, within the production of biodiesel based on recycled oil, takes from 8 to 24 h to complete. Therefore, the development of an automatic biodiesel decanting system is presented in order to optimize the production time in the line of this bio-fuel. The process consists of applying an electric field through two electrodes at 9 kV and simultaneously applying temperature. The results of the implementation showed that the production time was reduced by up to 99% without affecting the quality of biodiesel, according to the parameters of the American Society for Testing and Materials (ASTM).
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4

Hadaoui, Abdellah. "Effets de taille et de concentration sur les propriétés thermiques et rhéologiques des nanofluides". Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00769934.

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Le travail présenté dans cette thèse porte sur la synthèse et les caractérisations thermiques et rhéologiques d'un nouveau type de nanofluide : le système Cu2O/Glycérol. La caractérisation est faite en fonction de la taille des particules mises en suspension, de la température et de la fraction volumique solide. Ce travail a nécessité la synthèse des nanoparticules et des nanofluides par la méthode de décomposition thermique des précuseurs organométalliques, qui présente un bon rendement en quantité de nanoparticules (17%). Et le montage d'un dispositif de caractérisation thermique utilisant la méthode 3ω. Finalement, nous avons passé à la caractérisation rhéologique et thermique de ces échantillons. Les résultats obtenus avec ce nouveau système sont intéressants, car l'augmentation de la conductivité thermique atteint des valeurs importantes : 120% et 35% respectivement pour des fractions volumiques aussi faibles que 0,625% et 0,078% de nanoparticules de 7 nm de diamètre, sans influence notable sur la viscosité du fluide hôte, permettant une bonne amélioration du bilan énergétique total. Nous avons observé que la concentration et la taille (surface) des nanoparticules sont des paramètres clefs du comportement de la conductivité thermique effective du nanofluide Cu2O/Glycérol. Nos mesures nous ont permis de déduire la prédominance des modifications de la surface des nanoparticules (par fonctionnalisation ou par réaction chimique secondaire) sur le mouvement brownien dans les transferts thermiques nanoparticules/ fluide hôte.

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5

Mubarok, Mahdi. "Valorization of beech wood through development of innovative and environmentally friendly chemical modification treatments". Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0141.

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Dans cette étude, l’amélioration des propriétés physiques et de sa durabilité aux agents de dégradation biologique du hêtre européen (Fagus sylvatica) a été réalisée au moyen de différents traitements. Les premiers types de traitements sont basés sur l'imprégnation de dérivés vinyliques de glycérol ou de polyglycérol en tant qu'additif suivi d’une étape de modification thermique réalisée dans un réacteur ouvert (OHT) ou fermé (HPS). Le deuxième type de traitement repose sur la poly-estérification in situ du sorbitol et de l'acide citrique à différentes concentrations et températures de durcissement en système ouvert. Diverses propriétés de durabilité physique, chimique, mécanique et biologique des bois modifiés ont été évaluées. Les résultats montrent que certains traitements peuvent améliorer de manière significative les propriétés de durabilité physique et biologique du bois contre les agents de pourriture blanche, brune et molle et surtout vis-à-vis de l’attaque des termites comparativement au bois non traité ou modifié thermiquement uniquement
In this study, improvement of physical and biological durability properties of European beech (Fagus sylvatica) has been performed through different bulking impregnation treatments. The first modification was based on the impregnation of vinylic derivatives of glycerol or polyglycerol as additive followed with different thermal modification conditions in the opened system (OHT) or in the closed system (HPS). The second modification was based on the in-situ polyesterification of sorbitol and citric acid at different concentrations and curing temperatures in the opened system. Various physical, chemical, mechanical, and biological durability properties of the modified woods were evaluated, including certain properties during modification. The results have disclosed that certain treatments can improve significantly physical and biological durability properties of wood against decay (white rot, brown rot, and soft rot fungi) and termites attacks in comparison to untreated wood or thermally modified woods

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6

Enrione, Javier. "Mechanical stability of intermediate moisture starch-glycerol systems". Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/11634/.

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There is conflicting information on the mechanical properties and ageing kinetics of starch-water-glycerol systems. This makes understanding the changes occurring on storage of edible products difficult to predict. The work described in this thesis looks at model systems consisting of thermomechanically extruded plasticized starches (waxy maize, rice and wheat) and commercial products. The objectives of the work were to evaluate how the presence of polyols effects glass transition temperature (Tg), sorption isotherms, diffusion rates and texture parameters and to create models that could be used to predict behaviour. Very similar results were obtained for the starch samples except that monolayer (ma) values were higher for the waxy maize starch than for the wheat and rice. The waxy maize also was more brittle at equivalent moisture content when compared to the other two starches. Glycerol had a major impact on the water absorption. For RHs > 70% more water absorbed up by samples containing glycerol while the opposite occurred at RHs <60%. Monolayer values for GAB and BET confirmed this finding. The behaviour could be predicted if an interaction factor <1 was used in weight fraction models. Tg of the samples was measured by DSC and also by using predictive models, where the ten-Brinke Karas equation was found to give the best predictions. A value that was found to be most beneficial for the prediction of retrogradation was (storage temperature minus Tg). Change in texture was associate with (T-Tg), although the brittle ductile transition occurred 40°C below T-Tg=O. Diffusivity values increased with plasticizer level up to 8*10 3 m'z/s. There was an apparent fall in values when the samples were above Tg. However, it is suggested that this is due to sample geometry change rather than a change in diffusion mechanism. The Tg values also were found to be a good predictor of the type of change occurring in the model systems and food products during storage. Below Tg physical aging (enthalpy relaxtion) could be seen in the samples and retrogradation of the starch occurred above Tg. The rates of retrogradation were not affected by glycerol content directly and knowledge of Tg and storage temperature were sufficient to predict the retrogradation. Products became stiffer on storage and this was associated with molecular reassociation of the starchy component, but control of the moisture was also critical as water still dominated product behaviour even in the presence of glycerol.

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7

Rodríguez, Rodríguez Marta. "Catalytic Systems Adapted to Glycerol Medium. Applications in Selective Processes". Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/402406.

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Cada día se usan grandes cantidades de disolvente para diferentes aplicaciones industriales. La búsqueda de nuevos disolventes que sean menos dañinos para el medio ambiente, biodegradables y menos tóxicos, con el fin de reemplazar los disolventes orgánicos convencionales, se ha convertido en un área de investigación importante, especialmente cuando estos disolventes se pueden reutilizar sin necesidad de reacondicionamiento. En este sentido, los disolventes procedentes de la biomasa se han convertido en una solución prometedora. En especial, el glicerol, producido hoy en día en grandes cantidades en las industrias de biodiesel, se presenta como un buen candidato. Sus características, tales como su bajo coste, su baja toxicidad, su alto punto de ebullición y su selectiva miscibilidad y solubilidad con compuestos orgánicos hacen que sea un disolvente interesante para su uso en catálisis. Esta Tesis trata sobre el desarrollo de nuevos sistemas catalíticos adaptados para el uso de glicerol como disolvente. En particular, en este trabajo demostramos cómo el glicerol puede facilitar la estabilización de nanopartículas de cobre(I) capaces de catalizar la cicloadición 1,3-dipolar de Huisgen entre alquinos terminales y azidas orgánicas (conocida como reacción click). Además, esta reacción puede llevarse a cabo también en ausencia de metal usando alquinos internos, esta vez trabajando con radiación microondas con otros disolventes (incluyendo próticos), probablemente por su habilidad para formar enlaces de hidrógeno, lo que favorece la interacción con la radiación de microondas acelerando el proceso. Con el objetivo de estudiar procesos estereoselectivos en este medio, hemos sintetizado por primera vez nuevos derivados de PTA (1,3,5-triaza-7- fosfaadamantano) enantiopuros y hemos estudiado su actividad en diferentes reacciones catalíticas asimétricas de interés.
Cada dia s’empren grans quantitats de dissolvent per a diferents aplicacions industrials. La recerca de nous dissolvents que siguin menys nocius per al medi ambient, biodegradables i menys tòxics, per tal de substituir els dissolvents orgànics convencionals, s'ha convertit en una àrea d'investigació important, especialment quan aquests dissolvents es poden reutilitzar sense necessitat de reacondicionament. En aquest sentit, els dissolvents procedents de la biomassa han esdevingut una solució prometedora. En particular, el glicerol, produït avui dia en grans quantitats en les indústries de biodièsel, es presenta com un bon candidat. Les seves característiques, com ara el seu baix cost, la seva baixa toxicitat, el seu alt punt d'ebullició i la seva miscibilitat i solubilitat selectiva envers compostos orgànics fan que sigui un dissolvent interessant per al seu ús en catàlisi. Aquesta Tesi tracta sobre el desenvolupament de nous sistemes catalítics adaptats per a l'ús de glicerol com a dissolvent. En particular, en aquest treball demostrem com el glicerol pot facilitar l'estabilització de nanopartícules de coure (I) capaces de catalitzar la cicloaddició 1,3-dipolar de Huisgen entre alquins terminals i azides orgàniques (coneguda com reacció click). A més, aquesta reacció es pot dur a terme també en absència de metall usant alquins interns, aquest cop treballant amb radiació de microones altres dissolvents (incloent-hi pròtics), probablement per la seva habilitat per formar enllaços d'hidrogen, fet que afavoreix la interacció amb la radiació de microones, tot accelerant el procés. Amb l'objectiu d'estudiar processos estereoselectius en aquest medi, hem sintetitzat per primera vegada nous derivats de PTA (1,3,5-triaza-7- fosfaadamantà) enantiopurs i hem estudiat la seva activitat en diferents reaccions catalítiques asimètriques d'interès
Solvents are needed in large scale for different industrial applications. The search for less harmful, biodegradable, non-toxic green alternatives able to replace conventional organic solvents is an active area of research, especially when these solvents can be reused without the need of reconditioning treatments. In this sense, solvents derived from biomass are emerging as very promising solutions. Glycerol, produced in high amounts as a side product in biodiesel production, represents a good candidate. Due to its low cost, low toxicity, high boiling point and selective solubility and miscibility with organic compounds, glycerol represents a good choice to be applied in chemical transformations, including catalytic ones. This Thesis deals with the development of new catalytic systems in glycerol medium. In particular, in this work we show how glycerol can facilitate the stabilization of copper(I) nanoparticles that are able to catalyze the 1,3-dipolar Huisgen cycloaddition between terminal alkynes and organic azides (known as click reaction). Moreover, this reaction can be carried out in the absence of copper using internal alkynes, working under microwave irradiation. Glycerol favours the process in comparison with other solvents (including protic ones), probably due to its ability to form hydrogen bonds, which favors the interaction with microwave irradiation (accelerating the process).

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Rodriguez, Rodriguez Marta. "Catalytic systems adapted to glycerol medium : applications in selective processes". Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30007.

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La grande quantité des solvants utilisés dans l'industrie chimique représente un des problèmes les plus importants à aborder, d'un point de vue environnemental ainsi qu'économique. Les solvants communément utilisés sont volatiles, toxiques, inflammables et/ou corrosifs, et leur substitution par des autres moins nocifs est un objectif primordiale dans un cadre de développement durable. Le glycérol se présente comme un candidat prometteur pour remplacer les solvants organiques conventionnels. Il est généré comme produit concomitant dans la production de biodiesel. En conséquence, la valorisation du glycérol est devenue un enjeu majeur. Ce composé possède des propriétés très intéressantes pour être utilisé comme solvant en catalyse, telles que son innocuité, haut point d'ébullition, pression de vapeur négligeable, capacité de solubilisation de composés organiques et inorganiques, faible miscibilité avec autres solvants organiques et également son faible coût. Cette Thèse à pour objectif développer des nouveaux systèmes catalytiques dans un milieu glycérol. En particulier, dans ce travail nous montrons comme le glycérol promue la stabilisation de nanoparticules de cuivre (I) capables de catalyser la réaction de Huisgen 1,3-dipolaire entre alcynes terminaux et azotures organiques (connu comme la réaction click), de façon très efficace à température ambiante. Dans ce solvant, cette réaction peut aussi être réalisée en absence de cuivre avec alcynes internes non activés, en travaillant sous activation microondes. L'utilisation du glycérol favorise la réaction par rapport à des autres solvants (incluant ceux qui sont protiques), probablement grâce à sa capacité pour former liaisons d'hydrogène, favorisant l'interaction avec l'irradiation microondes (et ainsi accélérant la réaction). Avec le propos d'étudier des transformations stéréosélectives, nous avons préparé des nouveaux ligands énantiopures dérivés du PTA (1,3,5-triaza-7-phosphaadamantane). Ces composés innovants ont été utilisés en réactions énantiosélectives comme l'addition asymétrique de B2pin2 à N-Boc-imines (Cu) ou encore la alpha-amination (Cu), ou encore comme organocatalyseur (réaction de Morita-Baylis- Hillman)
Solvents are used in huge amounts in the chemical industry and this is one of the biggest problems to be solved not only from an environmental point of view, but also for economic reasons. The solvents commonly used in the industry are volatile, toxic, inflammable and/or corrosive; then, their replacement by others less harmful represents a crucial objective. Glycerol appears as a promising candidate to substitute the conventional organic solvents. It is produced in huge amounts as a waste in biodiesel industry. Consequently, the valorisation of glycerol becomes an important concern. This compound possesses very interesting properties to be used as solvent such as its non-toxicity, the wide range of temperature for its liquid state, negligible vapour pressure, capacity for solubilising organic and inorganic compounds, low miscibility with other organic solvents and also its low price. This Thesis deals with the development of new catalytic systems in glycerol medium. In particular, in this work we show how glycerol can facilitate the stabilisation of copper(I) nanoparticles that are able to catalyse the 1,3-dipolar Huisgen cycloaddition between terminal alkynes and organic azides (known as click reaction). The reaction proceeds at room temperature and it is very efficient. Moreover, this reaction can be carried out in the absence of copper using non-activated internal alkynes, working under microwave irradiation. Glycerol favours the process in comparison with other solvents (including protic ones), probably due to its ability to form hydrogen bonds, which favours the interaction with the microwave irradiation (accelerating the process). With the aim of studying stereoselective transformations, we have conceived new enantiopure ligands derived from PTA (1,3,5-triaza-7-phosphaadamantane). These innovative phosphines have been applied in enantioselective processes, such as pinacolboryl addition to N-Boc-imines (Cu) or alpha-amination (Cu), among others, or as organocatalyst (Morita-Baylis-Hillman reaction)

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Moreira, Soares Juliana. "ROLE OF GLYCEROL-3-PHOSPHATE PERMEASES IN PLANT DEFENSE". UKnowledge, 2018. https://uknowledge.uky.edu/plantpath_etds/23.

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Systemic acquired resistance (SAR) is a type of plant defense mechanism that is induced after a localized infection and confers broad-spectrum immunity against related or unrelated pathogens. During SAR, a number of chemical signals and proteins generated at the site of primary infection travel to the uninfected tissues and are thought to alert the distal sites against secondary infections. Glycerol-3-phosphate (G3P) is one of the chemical signals that play an important role in SAR. G3P is synthesized in the cytosol and chloroplasts via the enzymatic activities of G3P Dehydrogenase (G3Pdh) or Glycerol Kinase (GK). Interestingly, a mutation in three of the five G3Pdh isoforms or GK impairs SAR by lowering the pathogen induced G3P pool. This suggests that total cellular pool of G3P is critical for SAR. To determine factors contributing to G3P flux between various subcellular compartments I analyzed the role of putative G3P transporters in G3P flux and SAR. The Arabidopsis genome encodes five isoforms of G3P Permeases (G3Pp) and these transmembrane proteins are predicted to localize to plasma membrane, chloroplast or mitochondria. At least two G3Pp isoforms (G3Pp1 and G3Pp3) were able to complement the Escherichia coli mutant impaired in the uptake of G3P into the cytoplasm. Characterization of Arabidopsis G3Pp mutants showed that a mutation in G3Pp2, G3Pp3 and G3Pp4 compromised SAR but not local resistance. Furthermore, this SAR defect could only be complemented by exogenous application of G3P. The G3Pp mutants accumulated wild-type-like levels of G3P suggesting that the subcellular compartmentalization of G3P might contribute to the induction of SAR.

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Trombik, Tomasz. "Nemrznoucí teplonosné kapaliny na bázi glycerolu". Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-216789.

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This thesis is focused on proposition of non-freezing heat transfer fluid. Fluid will be based on mixture of propane-1,2,3-triol with water and modern corrosion inhibitors. Then will be investigate, if this new compound is competetive to common used liquids like ethylene glycol or propylene glycol.

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Capítulos de libros sobre el tema "Glycerol system"

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Zhang, Xu, Guibao Qiu y Xuewei Lv. "Simulation Study on Solution Foaming by Controlling Gas Generation Reaction in Water-Glycerol System". En 6th International Symposium on High-Temperature Metallurgical Processing, 413–20. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093381.ch52.

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Zhang, Xu, Guibao Qiu y Xuewei Lv. "Simulation Study on Solution Foaming by Controlling Gas Generation Reaction in Water-Glycerol System". En 6th International Symposium on High-Temperature Metallurgical Processing, 413–20. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48217-0_52.

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Persson, Gerd, Håkan Edlund y Göran Lindblom. "Phase behaviour of the 1-monooleoyl- rac-glycerol /n-octyl-β-D-glucoside/water system". En Trends in Colloid and Interface Science XVI, 36–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b11618.

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Persson, Gerd, Håkan Edlund y Göran Lindblom. "Phase behaviour of the 1-monooleoyl- rac-glycerol /n-octyl-β-D-glucoside/water system". En Trends in Colloid and Interface Science XVI, 36–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-36462-7_9.

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Al Basir, Fahad, Xianbing Cao, Sushil Kumar y Priti Kumar Roy. "Effect of Glycerol Kinetics and Mass Transfer During Enzymatic Biodiesel Production from Jatropha Oil". En Industrial Mathematics and Complex Systems, 305–17. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3758-0_22.

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Enrione, J., S. Hill, J. R. Mitchell y F. Pedreschi. "Sorption Behavior of Extruded Rice Starch in the Presence of Glycerol". En Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10, 483–89. Oxford, UK: Wiley-Blackwell, 2010. http://dx.doi.org/10.1002/9780470958193.ch40.

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Abouharim, Abdelhafid, Abdelghafour El moutarajji y Khalil El-Hami. "Effect of Multiwall Carbon Nanotube (MWCNT) Concentration on Thermal and Electrical Properties of Glycerol Nanofluid". En Advances in Intelligent Systems and Computing, 297–305. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36671-1_26.

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Maliger, Raju B., Peter J. Halley, Justin J. Cooper-White y Donna Dinnes. "Growth of Mesenchymal Stem Cells on Surface-Treated 2d Poly(Glycerol-Sebacate) Bio-Elastomers of Varying Stiffness". En Processing and Characterization of Multicomponent Polymer Systems, 43–62. Toronto : Apple Academic Press, 2019.: Apple Academic Press, 2019. http://dx.doi.org/10.1201/9780429469794-3.

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Woditsch, Isabelle y Karsten Schrör. "Glyceryl Trinitrate but not Spontaneous No Donors Preserve Myocardial Function and Cell Integrity in Ischemic Rabbit Hearts". En Mediators in the Cardiovascular System: Regional Ischemia, 189–94. Basel: Birkhäuser Basel, 1995. http://dx.doi.org/10.1007/978-3-0348-7346-8_27.

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Satterlee, James D. "Biophysical Characterization of Constituents of the Glycera dibranchiata Oxygen Transport and Utilization System: Erythrocytes and Monomer Hemoglobins". En Structure and Function of Invertebrate Oxygen Carriers, 171–77. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4612-3174-5_23.

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Actas de conferencias sobre el tema "Glycerol system"

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Chignell, Jeremy F. y Hong Liu. "Biohydrogen Production From Glycerol in Microbial Electrolysis Cells and Prospects for Energy Recovery From Biodiesel Wastes". En ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50274.

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The manufacture of biodiesel generates 10 wt% of glycerol as a byproduct. Currently, the majority of this waste glycerol is treated in wastewater treatment plants or incinerated. In this study, single chamber, membrane-free microbial electrolysis cells (MECs) was evaluated to produce hydrogen from pure glycerol and waste glycerol. At an applied voltage of 0.6 V, a maximum current density of 7.5 ± 0.4 A/m2 (238.6 ± 12.7 A/m3) was observed, the highest reported current density for a microbial electrochemical system operating on glycerol. Maximum current densities on 0.5% waste glycerin were 0.1–0.2 A/m2, much lower than those on pure glycerol, possibly due to the high salt and soap concentration in the waste glycerol. The maximum hydrogen yield on 50 mM glycerol was 1.8 ± 0.1 mol hydrogen/mol glycerol at a hydrogen production rate of 1.3 ± 0.1 m3/day/m3. The presence of methanol in the waste glycerin reduced hydrogen yield by nearly 30%. The energy efficiency on 0.5% of waste glycerol reached 200% at an applied voltage of 0.6 V. Conversion of all of the waste glycerol currently generated annually in global biodiesel manufacture to hydrogen using optimized MEC technology could generate ∼ 180 million kg of H2, representing a value of nearly $540 million, or the amount of H2 required for the production of 4.8 billion kg of green diesel. This study indicates that the generation of useful products (such as hydrogen) from waste glycerol will greatly increase the viability of the growing biodiesel industry.

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Eggly, Gabriel M., Paulo H. G. D. Diniz, Rodrigo Santos, Marcelo F. Pistonesi, Mario C. U. Araujo y Beatriz Fernandez Band. "An Embedded System for Determining Free Glycerol Level in Biodiesel". En 2013 III Brazilian Symposium on Computing Systems Engineering (SBESC). IEEE, 2013. http://dx.doi.org/10.1109/sbesc.2013.44.

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Ko, Myung Joo, Hyun June Park, So Yeon Hong, Camila Flor Yagonia y Young Je Yoo. "Biodiesel Production using Membrane Bioreactor System for in situ Glycerol Separation". En 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_244.

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Yu, Kaihong, Ren Takahashi y Makoto Ohta. "Development of the Working Fluid With Blood Viscosity for Evaluating Ablation Catheter in In Vitro System". En ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65975.

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The purpose of this study was to develop a working fluid with the proper viscosity to mimic blood flow to evaluate an ablation catheter. We proposed a working fluid that matches the blood viscosity, using glycerol-saline solution or xanthan gum (XG)-saline solution. We compared the two solution mixtures at various concentrations (for glycerol-saline solution, 10%, 30%, and 50%; for XG-saline solution, 0.10%, 0.11%, 0.12%, and 0.13%) by measuring their temperature dependence on viscosity. To test the developed working fluids, RF ablations were performed with both solutions, and the flow around the catheter during ablation was observed by particle image velocimetry (PIV) method. In addition, to test the efficacy of the solution mixtures, myocardium was observed after it was soaked separately in the two solution mixtures. The viscosity of both kinds of solution mixtures increased at higher concentrations and decreased with increasing temperatures. At 37°C, the viscosities of 50% glycerol-saline solution and 0.11%–0.13% XG-saline solution were 3–4 mPa·s, a value that is similar to the viscosity of blood. The upward flow resulting from heat convection by ablation was observed around the catheter in the PIV analysis using an in vitro model without flow. The solution mixture with the higher viscosity flowed at a lower velocity around the catheter, and the myocardium soaked in 50% glycerol-saline solution shrunk into a black and tough tissue. On the other hand, the myocardium soaked in XG-saline solution showed no change in color or shape. In conclusion, the XG-saline solution is a superior option for evaluating ablation catheters.

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Win, Shwe Sin, Swati Hegde y Thomas A. Trabold. "Techno-Economic Assessment of Different Pathways for Utilizing Glycerol Derived From Waste Cooking Oil-Based Biodiesel". En ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49563.

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Crude (i.e., unrefined) glycerol is the major by-product of biodiesel production, based on the homogeneous alkaline catalytic transesterification reaction. Currently, global biodiesel production capacity has been rising rapidly due to the overall growth of renewable energy demand. The amount of glycerol is increasing in parallel, and there is presently little market value for crude glycerol. In addition, disposing of this material via conventional methods becomes one of the major environmental issues and a burden for biodiesel manufacturers. Thus, utilization of purified glycerol in value-added applications such as food processing, cosmetics, soap and pharmaceuticals is critical to achieve economic scale of biodiesel production. In this paper, various pathways available to community-based biodiesel producers have been modeled to inform the decision-making process. A case study at Rochester Institute of Technology (RIT) was selected to evaluate the proposed system. Different pathways of utilizing crude glycerol were investigated, and economic feasibility of each pathway was analyzed. Purification of crude glycerol from waste cooking oil-based-biodiesel production was performed at small bench scale. Various recipes with different raw materials and purified glycerol as an ingredient were created for different kinds of saponification processes and applications. The resulting data from this preliminary assessment showed that producing biodiesel and high-quality soap is the most profitable option for RIT.

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Soenandi, Iwan Aang y Taufik Djatna. "A real time simulation model of production system of Glycerol Esterification with self optimization". En 2014 International Conference on Advanced Computer Science and Information Systems (ICACSIS). IEEE, 2014. http://dx.doi.org/10.1109/icacsis.2014.7065864.

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BONIN OKASAKI, FERNANDO, PABLO SEBASTIAN FERNANDEZ, LEONARDO P. ZUCOLO y MATHEUS B.C. DE SOUZA. "Improvement and utilization of a HPLC system for studies of electro-oxidation of Glycerol." En XXIV Congresso de Iniciação Científica da UNICAMP - 2016. Campinas - SP, Brazil: Galoa, 2016. http://dx.doi.org/10.19146/pibic-2016-51610.

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Fisher, Brian T., Michael R. Weismiller, Steven G. Tuttle y Katherine M. Hinnant. "Effects of Fluid Properties on Spray Characteristics of a Flow-Blurring Atomizer". En ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63135.

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In order to understand the reasons for the apparent benefits of using a flow-blurring (FB) atomizer in a combustion system, it is necessary to first examine fundamental spray characteristics under non-reacting conditions. Previous work on FB atomizers, however, has mostly involved only water and a relatively narrow range of parameters. In this study, a phase Doppler anemometry instrument was used to characterize FB atomizer sprays and determine the effects of varying surface tension and viscosity of the liquid. Operating at room pressure and temperature (i.e., a “cold spray”), droplet sizes and velocities were measured for water, a water/surfactant mixture (lower surface tension), a water/glycerol mixture (higher viscosity), and glycerol (much higher viscosity). For all of the tested fluids, with the exception of pure glycerol, the FB atomizer produced small droplets (below 50 μm) whose size did not vary significantly in the radial or axial direction, particularly above a characteristic distance from the atomizer exit. Results show that the spray is essentially unaffected by a 4.5x decrease in surface tension or a 7x increase in viscosity, and that Sauter mean diameter (SMD) only increased by approximately a factor of three when substituting glycerol (750x higher viscosity) for water. The results suggest that the FB atomizer can effectively atomize a wide range of liquids, making it a useful fuel-flexible atomizer for combustion applications.

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Wang, Lei, Enmin Feng y Zhilong Xiu. "Nonlinear Stochastic Dynamical System of Bio-Dissimilation of Glycerol to 1,3-Propanediol in Batch Culture and Its Viable Set". En 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5163119.

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Wahyuningtyas, Dewi y Arwitra Dinata. "Combination of carboxymethyl cellulose (CMC) - Corn starch edible film and glycerol plasticizer as a delivery system of diclofenac sodium". En HUMAN-DEDICATED SUSTAINABLE PRODUCT AND PROCESS DESIGN: MATERIALS, RESOURCES, AND ENERGY: Proceedings of the 4th International Conference on Engineering, Technology, and Industrial Application (ICETIA) 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5042952.

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Informes sobre el tema "Glycerol system"

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BOSTON UNIV MA SCHOOL OF MEDICINE. Rejuvenation and Freezing of Additive-Preserved Red Blood Cells in the 1000 ML-600 ML Polyvinyl Chloride Freezing Bay System Stored for Up to 42 Days at 4 C Prior to Rejuvenation and Glycerolization Using 40% W/V Glycerol and Storage at -80 C, Washed in the Haemonetics Blood Processor 115, and Stored at 4 C for up to 24 Hours Prior to Transfusion. Fort Belvoir, VA: Defense Technical Information Center, agosto de 1997. http://dx.doi.org/10.21236/ada360394.

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