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Journal articles on the topic 'Ethanol Dehydration'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 June 2025

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1

Uyazán, Ana María, Iván Dario Gil, Jaime Aguilar, Gerardo Rodríguez Niño, and Luis A. Caicedo Mesa. "Producing fuel alcohol by extractive distillation: Simulating the process with glycerol." Ingeniería e Investigación 26, no. 1 (2006): 39–48. http://dx.doi.org/10.15446/ing.investig.v26n1.14675.

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Downstream separation processes in biotechnology form part of the stages having most impact on a product's final cost. The tendency throughout the world today is to replace fossil fuels with those having a renewable origin such as ethanol; this, in turn, produces a demand for the same and the need for optimising fermentation, treating vinazas and dehydration processes. The present work approaches the problem of dehydration through simulating azeotropic ethanol extractive distillation using glycerol as separation agent. Simulations were done on an Aspen Plus process simulator (Aspen Tech version 11.1). The simulated process involves two distillation columns, a dehydrator and a glycerol recuperation column. Simulation restrictions were ethanol's molar composition in dehydrator column distillate and the process's energy consumption. The effect of molar reflux ratio, solvent-feed ratio, solvent entry and feed stage and solvent entry temperature were evaluated on the chosen restrictions. The results showed that the ethanol-water mixture dehydration with glycerol as separation agent is efficient from the energy point of view.

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2

Uyazán, Ana María, Iván Dario Gil, J. L. Aguilar, Gerardo Rodríguez Niño, and Luis Alfonso Caicedo. "Ethanol dehydration." Ingeniería e Investigación 24, no. 3 (2004): 49–59. http://dx.doi.org/10.15446/ing.investig.v24n3.14610.

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This review outlines ethanol dehydration processes and their most important characteristics. It also deals with the main operating variables and some criteria used in designing the separation scheme. A differentiation is made between processes involving liquid-steam balance in separation operations and those doing it by screening the difference in molecule size. The last part presents a comparison between the three main industrial processes, stressing their strengths and weaknesses from the operational, energy consumption and industrial services points of view.

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3

Muhali, Muhali, Hulyadi Hulyadi, and Faizul Bayani. "Evaluating Glycerol's Performance as a Sustainable Dehydrator in Ethanol Purification." Hydrogen: Jurnal Kependidikan Kimia 12, no. 6 (2025): 1529. https://doi.org/10.33394/hjkk.v12i6.14417.

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This research aims to evaluate the effectiveness of glycerol as a dehydrator in the process of purifying ethanol solutions. This study is a quantitative descriptive research aimed at analyzing the effectiveness of glycerol, derived from used cooking oil, as a water dehydrating agent in the ethanol purification process. Data obtained will be quantitative and statistically analyzed to evaluate glycerol's performance as a dehydrator. The research was conducted at the Chemistry Laboratory of Mandalika Education University (UNDIKMA) over a specific period according to the research schedule.Independent Variable is glycerol from used cooking oil as a dehydrating agent. The concentration of glycerol used is determined based on the percentage of glycerol in the ethanol solution. Dependent variable the effectiveness of ethanol purification, measured through the comparison of density and percentage of standard bioethanol and Controlled variables is Temperature and pressure during the dehydration process, duration of the purification process, and the initial ethanol concentration before purification. Data analysis uses a simple regression curve that follows Lambert Beer's law. In conclusion, the results obtained (increasing the ethanol concentration to 90.5%) show that glycerol is a very effective dehydrator in reducing water content, especially for solutions with high water content such as ethanol at an initial concentration of 23.3%.

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4

Tanaka, B., and L. Otten. "Dehydration of aqueous ethanol." Energy in Agriculture 6, no. 1 (1987): 63–76. http://dx.doi.org/10.1016/0167-5826(87)90023-4.

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5

Bui Tan, Loc, Tu Le Nguyen Quang, and Long Nguyen Quang. "Ethylene production via ethanol dehydration over desilicated ZSM-5 catalyst." Vietnam Journal of Catalysis and Adsorption 10, no. 4 (2021): 79–83. http://dx.doi.org/10.51316/jca.2021.072.

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The catalytic dehydration of ethanol is a potential alternative route to synthesize ethylene apart from the traditional method which depends on fossil fuels. This report successfully prepared modified ZSM-5 with mesopores using desilication methods to enhance ethanol catalytic dehydration performance and ethylene production at lower temperature. The modified zeolite have the external surface area increased by 3.5 times and a higher dehydration efficiency compared with the original sample especially at temperatures below 220°C. Increasing reaction temperatures and gas houly space velocity (GHSV) increased the dehydration efficiency while increasing the inlet ethanol concentration had opposite effect. Significantly, the ethanol conversion over modified zeolite remained above 90 % when the GHSV increased to 36000 h‑1 after the time-on-stream of 24 h.

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6

Zhang, Minhua, and Yingzhe Yu. "Dehydration of Ethanol to Ethylene." Industrial & Engineering Chemistry Research 52, no. 28 (2013): 9505–14. http://dx.doi.org/10.1021/ie401157c.

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7

Hutahaean, L. S., W.-H. Shen, and V. Van Brunt. "Heat Integrated Ethanol Dehydration Flowsheets." Separation Science and Technology 30, no. 7-9 (1995): 1867–82. http://dx.doi.org/10.1080/01496399508010381.

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8

Meirelles, Antonio, Siegfried Weiss, and Herbert Herfurth. "Ethanol dehydration by extractive distillation." Journal of Chemical Technology & Biotechnology 53, no. 2 (2007): 181–88. http://dx.doi.org/10.1002/jctb.280530213.

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9

Cheng, You Shen, Huang Hsing Pan, Jian Long Syue, and Hsin Chen Chiang. "Effect of Free Water on Polarization and Piezoelectric Coefficients of Cement-Based Piezoelectric Composites during Manufacturing Process." Materials Science Forum 1150 (June 3, 2025): 113–24. https://doi.org/10.4028/p-5qsfns.

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Cement-based piezoelectric composites (PECs) consist of calcium aluminate cement (CAC) and lead zirconate titanate (PZT), each accounting for 50 vol.% that can be used for structural health monitoring (SHM) due to their excellent compatibility with cementitious structures. The presence of free water inside the specimen significantly affects the polarization difficulty and piezoelectricity of PEC. Four treatment methods include vacuum drying, ethanol dehydration, non-heat treatment (untreated), and heat treatment to reduce free water in specimens. Experimental results show that reducing the free water content of PEC specimens through vacuum drying, ethanol dehydration, and heat treatment during the manufacturing process can enhance PEC performance. The free water reduction effect of PEC specimens was most with the heat treatment, followed by ethanol dehydration, and least by vacuum drying. The specimen’s dielectric loss and relative permittivity before polarization decreased if heat treatment and ethanol dehydration were applied. Heat-treated specimens provide optimal relative permittivity and piezoelectric strain constant after polarization. For the piezoelectric voltage constant, ethanol dehydration of the specimen is better than other treatments. The treatment method affects the resonance frequency value and the electromechanical coupling coefficient of the specimen. Water removal of specimens is not a suitable treatment method to increase the electromechanical coupling coefficient.

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10

Mambetova, Manshuk, Gaukhar Yergaziyevna, and Kusman Dossumov. "Thermoconversion of ethanol on Al2O3 and SiO2 oxides." Chemical Bulletin of Kazakh National University, no. 1 (January 21, 2022): 22–29. http://dx.doi.org/10.15328/cb1227.

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This work is devoted to the study of the catalytic properties of Al2O3 and SiO2 in the process of thermal conversion of ethanol, as well as to the determination of the acid characteristics of these oxides The catalytic properties of oxides in the thermal conversion of ethanol were studied in a flow-through mode at a reaction temperature of 250°C and a space velocity of 0,5 h-1. The acidic characteristics of the Al2O3 and SiO2 oxides were determined by the method temperature-programmed desorption of ammonia (TPD-NH3). It has been established that the process of thermal conversion of ethanol includes the reactions of dehydration, dehydrogenation and dimerization. During the thermal conversion of ethanol on aluminum and silicon oxides, a dehydration reaction occurs with the formation of diethyl ether, with concentrations of 24,5 vol. % on Al2O3 and 19,6 vol. % on SiO2. It was determined that in parallel with the reaction of ethanol dehydration, its dehydrogenation with the formation of acetaldehyde takes place, but with a lower selectivity compared to dehydration. It was found that on Al2O3, which has a lower acidity in comparison with SiO2, the deformation of acetaldehyde occurs with the formation of butanol.

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11

Sato, Kiminori, Takehito Mizuno, and Takashi Nakane. "Concentration and Dehydration of Biomass Ethanol." MEMBRANE 31, no. 1 (2006): 20–21. http://dx.doi.org/10.5360/membrane.31.20.

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12

Szitkai, Z., Z. Lelkes, E. Rev, and Z. Fonyo. "Optimization of hybrid ethanol dehydration systems." Chemical Engineering and Processing: Process Intensification 41, no. 7 (2002): 631–46. http://dx.doi.org/10.1016/s0255-2701(01)00192-1.

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13

Tihmillioglu, Funda, and Semra Ulku. "Use of Clinoptilolite in Ethanol Dehydration." Separation Science and Technology 31, no. 20 (1996): 2855–65. http://dx.doi.org/10.1080/01496399608000832.

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14

Furzer, I. A. "Ethanol dehydration column efficiencies using UNIFAC." AIChE Journal 31, no. 8 (1985): 1389–92. http://dx.doi.org/10.1002/aic.690310818.

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15

Puvion-Dutilleul, F., E. Pichard, M. Laithier, and E. H. Leduc. "Effect of dehydrating agents on DNA organization in herpes viruses." Journal of Histochemistry & Cytochemistry 35, no. 6 (1987): 635–45. http://dx.doi.org/10.1177/35.6.3033063.

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With routine procedures of Epon- or GMA-embedding and a stain specific for DNA, the nucleoid of mature herpes simplex virus-type 1 (HSV-1) assumes the well-known form of a short, compact, hollow cylinder or torus. A new, more complex organization of DNA filaments in encapsidated HSV-1 was found in infected cells after aldehyde fixation, methanol dehydration, and Lowicryl embedment. We have determined that it is the use of methanol as dehydrating agent that permits visualization of this internal structure. The same new spatial organization of DNA can be seen in Epon and GMA sections when methanol dehydration is used. This organization is lost in a methanol-ethanol sequence of dehydration but can be restored in an ethanol-methanol sequence. Dimethylsulfoxide (DMSO) is the only other agent among several reviewed here which resembles methanol in its effect on HSV-1 DNA. Methanol had the same effect on five subfamilies of the herpes group (HSV-1, HSV-2, CCV, CMV, CTHV) but did not alter the nucleoid ultrastructure in simian virus 40 (SV40) and adenovirus type 5 (Ad 5). Therefore, it may sometimes, but not always, provide additional information about the organization of biological structures.

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16

Gupta, Oindrila, Sagar Roy, Lingfen Rao, and Somenath Mitra. "Graphene Oxide-Carbon Nanotube (GO-CNT) Hybrid Mixed Matrix Membrane for Pervaporative Dehydration of Ethanol." Membranes 12, no. 12 (2022): 1227. http://dx.doi.org/10.3390/membranes12121227.

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The pervaporation process is an energy-conservative and environmentally sustainable way for dehydration studies. It efficiently separates close boiling point and azeotrope mixtures unlike the distillation process. The separation of ethanol and water is challenging as ethanol and water form an azeotrope at 95.6 wt.% of ethanol. In the last few decades, various polymers have been used as candidates in membrane preparation for pervaporation (PV) application, which are currently used in the preparation of mixed matrix membranes (MMMs) for ethanol recovery and ethanol dehydration but have not been able to achieve an enhanced performance both in terms of flux and selectivity. Composite membranes comprising of poly (vinyl alcohol) (PVA) incorporated with carboxylated carbon nanotubes (CNT-COOH), graphene oxide (GO) and GO-CNT-COOH mixtures were fabricated for the dehydration of ethanol by pervaporation (PV). The membranes were characterized with Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Raman spectroscopy, Raman imaging, contact angle measurement, and water sorption to determine the effects of various nanocarbons on the intermolecular interactions, surface hydrophilicity, and degrees of swelling. The effects of feed water concentration and temperature on the dehydration performance were investigated. The incorporation of nanocarbons led to an increase in the permeation flux and separation factor. At a feed water concentration of 10 wt.%, a permeation flux of 0.87 kg/m2.h and a separation factor of 523 were achieved at 23 °C using a PVA-GO-CNT-COOH hybrid membrane.

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17

Morávek, Vladimír, and Miloš Kraus. "Kinetics of individual steps in reaction network ethanol-diethyl ether-ethylene-water on alumina." Collection of Czechoslovak Chemical Communications 51, no. 4 (1986): 763–73. http://dx.doi.org/10.1135/cccc19860763.

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The rates of single reactions have been measured at 250 °C in the complex reaction of ethanol dehydration to ethylene and to diethyl ether involving also hydrolysis of the ether, its disproportionation to ethanol and ethylene and its dehydration to ethylene. The found dependences of the initial reaction rates on partial pressures of the reactants were correlated by semiempirical Langmuir-Hinshelwood type rate equations.

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18

Mahmudah, Rizqi, Aldino Javier Saviola, Sri Sudiono, Niko Prasetyo, and Karna Wijaya. "An Effective Synthesis of Phosphated Silica (PO<sub>4</sub>/SiO<sub>2</sub>) Catalyst and its Performance for Converting Ethanol into Diethyl Ether (DEE)." Solid State Phenomena 365 (November 11, 2024): 77–86. http://dx.doi.org/10.4028/p-6iurwp.

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Research on phosphated silica (PO4/SiO2) as a heterogeneous acid catalyst in the dehydration reaction of ethanol into diethyl ether has been carried out. The PO4/SiO2 was prepared from TEOS by a wet impregnation method with various concentrations of H3PO4 (1, 2, 3, 4 M) and calcination temperatures (400, 500, and 600 °C) to obtain it with an optimum acidity. Afterward, the catalysts were characterized by FTIR, XRD, SEM-EDX, SAA, and TG-DTA. Ethanol dehydration was run using a fixed-batch reactor with a flow of N2 gas, and GC determined the selectivity of diethyl ether. The PS-4-400 catalyst had the highest activity and selectivity in the ethanol dehydration to diethyl ether at a temperature of 225 °C, with a conversion of 58.00% and a DEE selectivity of 3.71%.

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19

Święs, Aneta, Andrzej Kowalczyk, Barbara Gil, and Lucjan Chmielarz. "Dehydration of methanol and ethanol over ferrierite originated layered zeolites – the role of acidity and porous structure." RSC Advances 12, no. 15 (2022): 9395–403. http://dx.doi.org/10.1039/d2ra00334a.

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Opened porous structures of ITQ-6 and ITQ-36, are more effective in catalytic dehydration of ethanol to diethyl ether than microporous ferrierite. Surface acidity determines catalytic performance of the zeolite catalysts in alcohol dehydration.

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20

Schul’tsev, A. L. "Thermal dehydration of 2-(4-aminophenyl)ethanol." Russian Journal of General Chemistry 81, no. 11 (2011): 2300–2303. http://dx.doi.org/10.1134/s1070363211110132.

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21

YEH, AN-I., and LLOYD BERG. "THE DEHYDRATION OF ETHANOL BY EXTRACTIVE DISTILLATION." Chemical Engineering Communications 113, no. 1 (1992): 147–53. http://dx.doi.org/10.1080/00986449208936009.

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22

Lelkes, Z., Z. Szitkai, E. Rev, and Z. Fonyo. "Rigorous MINLP model for ethanol dehydration system." Computers & Chemical Engineering 24, no. 2-7 (2000): 1331–36. http://dx.doi.org/10.1016/s0098-1354(00)00407-5.

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23

Wu, Yi, Li Ding, Zong Lu, Junjie Deng, and Yanying Wei. "Two-dimensional MXene membrane for ethanol dehydration." Journal of Membrane Science 590 (November 2019): 117300. http://dx.doi.org/10.1016/j.memsci.2019.117300.

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24

Limlamthong, Mutjalin, Nithinart Chitpong та Bunjerd Jongsomjit. "Influence of Phosphoric Acid Modification on Catalytic Properties of γ-χ Al2O3 Catalysts for Dehydration of Ethanol to Diethyl Ether". Bulletin of Chemical Reaction Engineering & Catalysis 14, № 1 (2019): 1. http://dx.doi.org/10.9767/bcrec.14.1.2436.1-8.

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In this present work, diethyl ether, which is currently served as promising alternative fuel for diesel engines, was produced via catalytic dehydration of ethanol over H3PO4-modified g-c Al2O3 catalysts. The impact of H3PO4 addition on catalytic performance and characteristics of catalysts was investigated. While catalytic dehydration of ethanol was performed in a fixed-bed microreactor at the temperature ranging from 200ºC to 400ºC under atmospheric pressure, catalyst characterization was conducted by inductively coupled plasma (ICP), X-ray diffraction (XRD), N2 physisorption, temperature-programmed desorption of ammonia (NH3-TPD) and thermogravimetric (TG) analysis. The results showed that although the H3PO4 addition tended to decrease surface area of catalyst resulting in the reduction of ethanol conversion, the Al2O3 containing 5 wt% of phosphorus (5P/Al2O3) was the most suitable catalyst for the catalytic dehydration of ethanol to diethyl ether since it exhibited the highest catalytic ability regarding diethyl ether yield and the quantity of coke formation as well as it had similar long-term stability to conventional Al2O3 catalyst. The NH3-TPD profiles of catalysts revealed that catalysts containing more weak acidity sites were preferred for dehydration of ethanol into diethyl ether and the adequate promotion of H3PO4 would lower the amount of medium surface acidity with increasing catalyst weak surface acidity. Nevertheless, when the excessive amount of H3PO4 was introduced, it caused the destruction of catalysts structure, which resulted in the catalyst incapability due to the decrease in active surface area and pore enlargement. Copyright © 2019 BCREC Group. All rights reservedReceived: 28th March 2018; Revised: 7th August 2018; Accepted: 15th August 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Limlamthong, M., Chitpong, N., Jongsomjit, B. (2019). Influence of Phosphoric Acid Modification on Catalytic Properties of g-c Al2O3 Catalysts for Dehydration of Ethanol to Diethyl Ether. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 1-8 (doi:10.9767/bcrec.14.1.2436.1-8)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2436.1-8

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25

Anisa, Witri Sofiarani, and Rokhati Nur. "The Effect of Glutaraldehyde as Crosslinking Agent in the Sweet Potato Starch/Chitosan Membrane for Pervaporation Method." International Journal of Innovative Science and Research Technology 8, no. 1 (2023): 168–73. https://doi.org/10.5281/zenodo.7554204.

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The aim of this study was to investigate the dehydration of ethanol using the pervaporation process based on a sweet potato starch-chitosan membrane. The pervaporation process is an alternative to the energyintensive methods of ethanol dehydration, like distillation and crystallization. To improve the properties of the composite membrane by adding a crosslinking agent of glutaraldehyde (1% v/v) and a support membrane of polyethersulfone (PES) were added. The sweet potato starch-chitosan membrane was modified with various concentrations of 100:0, 80:40, 60:40, 50:50, 40:60, 20:80, and 0:100. The characterization of the composite membrane used tests such as swelling degree, permeability, mechanical properties, and SEM to evaluate the hydrophilicity, structure, and performance. The increase of hydrophilicity showed at the value of swelling degree of 204.16 to 226.52%, and permeability of 861.34 to 964.26 L/m2 .hr.bar. The structure of the membrane improved by the addition of glutaraldehyde, shown in the mechanical properties and SEM results. The best composition is a ratio of 50:50 with a crosslinking agent used for dehydration of ethanol with the pervaporation process. The process used ethanol composition (95 wt.%) and was observed for an hour. The value of selectivity in the pervaporation process is 15% with an ethanol concentration of 98%.

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26

Castro-Muñoz, Roberto, Francesco Galiano, Vlastimil Fíla, Enrico Drioli, and Alberto Figoli. "Mixed matrix membranes (MMMs) for ethanol purification through pervaporation: current state of the art." Reviews in Chemical Engineering 35, no. 5 (2019): 565–90. http://dx.doi.org/10.1515/revce-2017-0115.

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Abstract Over the last few decades, different polymers have been employed as materials in membrane preparation for pervaporation (PV) application, which are currently used in the preparation of mixed matrix membranes (MMMs) for ethanol recovery and ethanol dehydration. The ethanol-water and water-ethanol mixtures are, in fact, the most studied PV systems since the bioethanol production is strongly increasing its demand. The present review focuses on the current state of the art and future trends on ethanol purification by using MMMs in PV. A particular emphasis will, therefore, be placed on the enhancement of specific components transport and selectivity through the incorporation of inorganic materials into polymeric membranes, mentioning key principles on suitable filler selection for a synergistic effect toward such separations. In addition, the following topics will be discussed: (i) the generalities of PV, including the theoretical aspects and its role in separation; (ii) a general overview of the methodologies for the preparation of MMMs; and (iii) the most recent findings based on MMMs for both ethanol recovery and ethanol dehydration for better evolution in the field. From the last decade of literature inputs, the poly(vinyl alcohol) has been the most used polymeric matrix targeting ethanol dehydration, while the zeolites have been the most used embedded materials. Today, the latest developments on MMM preparation declare that the future efforts will be directed to the chemical modification of polymeric materials as well as the incorporation of novel fillers or enhancing the existing ones through chemical modification.

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27

Inmanee, Tharmmanoon, Piriya Pinthong та Bunjerd Jongsomjit. "Effect of Calcination Temperatures and Mo Modification on Nanocrystalline (γ-χ)-Al2O3 Catalysts for Catalytic Ethanol Dehydration". Journal of Nanomaterials 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/5018384.

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The mixed gamma and chi crystalline phase alumina (M-Al) catalysts prepared by the solvothermal method were investigated for catalytic ethanol dehydration. The effects of calcination temperatures and Mo modification were elucidated. The catalysts were characterized by X-ray diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), and NH3-temperature programmed desorption (NH3-TPD). The catalytic activity was tested for ethylene production by dehydration reaction of ethanol in gas phase at atmospheric pressure and temperature between 200°C and 400°C. It was found that the calcination temperatures and Mo modification have effects on acidity of the catalysts. The increase in calcination temperature resulted in decreased acidity, while the Mo modification on the mixed phase alumina catalyst yielded increased acidity, especially in medium to strong acids. In this study, the catalytic activity of ethanol dehydration to ethylene apparently depends on the medium to strong acid. The mixed phase alumina catalyst calcined at 600°C (M-Al-600) exhibits the complete ethanol conversion having ethylene yield of 98.8% (at 350°C) and the Mo-modified catalysts promoted dehydrogenation reaction to acetaldehyde. This can be attributed to the enhancement of medium to strong acid with metal sites of catalyst.

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28

Van der Borght, Alexopoulos, Toch, Thybaut, Marin, and Galvita. "First-Principles-Based Simulation of an Industrial Ethanol Dehydration Reactor." Catalysts 9, no. 11 (2019): 921. http://dx.doi.org/10.3390/catal9110921.

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The achievement of new economically viable chemical processes often involves the translation of observed lab-scale phenomena into performance in an industrial reactor. In this work, the in silico design and optimization of an industrial ethanol dehydration reactor were performed, employing a multiscale model ranging from nano-, over micro-, to macroscale. The intrinsic kinetics of the elementary steps was quantified through ab initio obtained rate and equilibrium coefficients. Heat and mass transfer limitations for the industrial design case were assessed via literature correlations. The industrial reactor model developed indicated that it is not beneficial to utilize feeds with high ethanol content, as they result in lower ethanol conversion and ethene yield. Furthermore, a more pronounced temperature drop over the reactor was simulated. It is preferred to use a more H2O-diluted feed for the operation of an industrial ethanol dehydration reactor.

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29

Bates, Jason S., Brandon C. Bukowski, Jeffrey Greeley, and Rajamani Gounder. "Correction: Structure and solvation of confined water and water–ethanol clusters within microporous Brønsted acids and their effects on ethanol dehydration catalysis." Chemical Science 11, no. 31 (2020): 8323–24. http://dx.doi.org/10.1039/d0sc90162h.

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Correction for ‘Structure and solvation of confined water and water–ethanol clusters within microporous Brønsted acids and their effects on ethanol dehydration catalysis’ by Jason S. Bates et al., Chem. Sci., 2020, 11, 7102–7122, DOI: 10.1039/D0SC02589E.

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30

Carreño-Díaz, Luz A. "Dehydration of bioethanol with both pure ionic liquids and an ionic liquid anchored to mesoporous silica: A comparative study." CT&F - Ciencia, Tecnología y Futuro 8, no. 1 (2018): 113–19. http://dx.doi.org/10.29047/01225383.98.

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Bioethanol is produced by the fermentation of different raw materials; anhydrous ethanol is used as biofuel. This article reports the study of the dehydration of bioethanol by breaking the azeotrope, using ionic liquids as entrainers. Three ionic liquids (LIs) [EMIM][Cl], [EMIM][OAc], and [BMIM][Cl] were tested as entrainers; the behavior of ternary mixes of bioethanol-water-LI were evaluated through the activity coefficients and the relative volatility of bioethanol at 80°C and atmospheric pressure. In this first study it was concluded that the [EMIM][Cl] was the most effective IL for dehydration purposes: bioethanol (93.45 % v/v) after three cycles of extraction was (99.20 % v/v) when a mass ratio bioethanol-IL of 0.55 was used. Based on the first study, a composite was prepared by anchoring the LI 1-ethyl-(3-trimethoxysilil) propyl imidazolium chloride to mesoporous SiO2. The composite was characterized and it has been confirmed that there is a covalent bond between the IL and the matrix. The material was tested as dehydrating agent; results of these two studies were compared and showed that the pure ionic liquids could be used as entrainers in extractive distillations, breaking water-ethanol azeotrope, also showing the same ionic liquids able to be anchored to matrices as solid composites for dehydration, offering additional advantages such as selectivity, less time consuming, recyclability, and significantly diminishes (84%), the requirement for the amount of the IL.

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31

Duque Salazar, Ana Catalina, Miguel Ángel Gómez García, Javier Fontalvo, Marcin Jedrzejczyk, Jacek Michal Rynkowski, and Izabela Dobrosz-Gómez. "Ethanol dehydration by pervaporation using microporous silica membranes." Desalination and Water Treatment 51, no. 10-12 (2013): 2368–76. http://dx.doi.org/10.1080/19443994.2012.728053.

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32

Gomis, Vicente, Ricardo Pedraza, Olga Francés, Alicia Font, and Juan Carlos Asensi. "Dehydration of Ethanol Using Azeotropic Distillation with Isooctane." Industrial & Engineering Chemistry Research 46, no. 13 (2007): 4572–76. http://dx.doi.org/10.1021/ie0616343.

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33

Huang, Yu, Jennifer Ly, Dung Nguyen, and Richard W. Baker. "Ethanol Dehydration Using Hydrophobic and Hydrophilic Polymer Membranes." Industrial & Engineering Chemistry Research 49, no. 23 (2010): 12067–73. http://dx.doi.org/10.1021/ie100608s.

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34

Zhang, Xiwang, Ziyao Ning, David K. Wang, and João C. Diniz da Costa. "A novel ethanol dehydration process by forward osmosis." Chemical Engineering Journal 232 (October 2013): 397–404. http://dx.doi.org/10.1016/j.cej.2013.07.106.

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35

Bedia, J., R. Barrionuevo, J. Rodríguez-Mirasol, and T. Cordero. "Ethanol dehydration to ethylene on acid carbon catalysts." Applied Catalysis B: Environmental 103, no. 3-4 (2011): 302–10. http://dx.doi.org/10.1016/j.apcatb.2011.01.032.

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36

Conde-Mejía, Carolina, and Arturo Jiménez-Gutiérrez. "Analysis of ethanol dehydration using membrane separation processes." Open Life Sciences 15, no. 1 (2020): 122–32. http://dx.doi.org/10.1515/biol-2020-0013.

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AbstractAfter the biomass pretreatment and fermentation processes, the purification step constitutes a major task in bioethanol production processes. The use of membranes provides an interesting choice to achieve high-purity bioethanol. Membrane separation processes are generally characterized by low energy requirements, but a high capital investment. Some major design aspects for membrane processes and their application to the ethanol dehydration problem are addressed in this work. The analysis includes pervaporation and vapor permeation methods, and considers using two types of membranes, A-type zeolite and amorphous silica membrane. The results identify the best combination of membrane separation method and type of membrane needed for bioethanol purification.

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Lopes, Juliana F., Juliana C. M. Silva, Maurício T. M. Cruz, José Walkimar de M. Carneiro, and Wagner B. De Almeida. "DFT study of ethanol dehydration catalysed by hematite." RSC Advances 6, no. 46 (2016): 40408–17. http://dx.doi.org/10.1039/c6ra08509a.

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Yang, Dong, Jie Li, Zhongyi Jiang, Lianyu Lu, and Xue Chen. "Chitosan/TiO2 nanocomposite pervaporation membranes for ethanol dehydration." Chemical Engineering Science 64, no. 13 (2009): 3130–37. http://dx.doi.org/10.1016/j.ces.2009.03.042.

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Grisales Díaz, Víctor Hugo, and Gerard Olivar Tost. "Ethanol and isobutanol dehydration by heat-integrated distillation." Chemical Engineering and Processing: Process Intensification 108 (October 2016): 117–24. http://dx.doi.org/10.1016/j.cep.2016.07.005.

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Ibnu Abdulwahab, M., A. Khamkeaw, B. Jongsomjit, and M. Phisalaphong. "Bacterial Cellulose Supported Alumina Catalyst for Ethanol Dehydration." Catalysis Letters 147, no. 9 (2017): 2462–72. http://dx.doi.org/10.1007/s10562-017-2145-y.

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Armor, John N. "Dehydration of ethanol with a novel membrane reactor." Applied Catalysis A: General 108, no. 1 (1994): N7. http://dx.doi.org/10.1016/0926-860x(94)85184-0.

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Rajadurai, S., and T. M. Geetha. "Dehydration of ethanol on filtrol and modified filtrols." Materials Chemistry and Physics 15, no. 2 (1986): 173–83. http://dx.doi.org/10.1016/0254-0584(86)90122-7.

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Alviany, Riza, Arifuddin Wahyudi, Ignatius Gunardi, Achmad Roesyadi, Firman Kurniawansyah, and Danawati Hari Prajitno. "Diethyl Ether Production as a Substitute for Gasoline." MATEC Web of Conferences 156 (2018): 06003. http://dx.doi.org/10.1051/matecconf/201815606003.

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Diethyl ether is one of alternative fuel that could be used as a significant component of a blend or as a complete replacement for transportation fuel. The aim of this research is to produce diethyl ether through dehydration reaction of ethanol with fixed bed reactor using nanocrystalline γ-Al2O3 catalyst. Nanocrystalline γ-Al2O3 catalyst was synthesized by precipitation method using Al(NO3)3.9H2O as precursors and NH4OH as the precipitating agent. Dehydration reaction was performed at temperature range of 125 to 225°C. The result shows that synthesized γ-Al2O3 catalyst gave higher ethanol conversion and diethyl ether yield than that of commercial Al2O3 catalyst. The use of synthesized γ-Al2O3 catalyst could reach ethanol conversion as high as 94.71% and diethyl ether yield as high as 11,29%.

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Bermudez Jaimes, John Hervin, Mario Eusebio Torres Alvarez, Elenise Bannwart de Moraes, Maria Regina Wolf Maciel, and Rubens Maciel Filho. "Separation and Semi-Empiric Modeling of Ethanol–Water Solutions by Pervaporation Using PDMS Membrane." Polymers 13, no. 1 (2020): 93. http://dx.doi.org/10.3390/polym13010093.

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High energy demand, competitive fuel prices and the need for environmentally friendly processes have led to the constant development of the alcohol industry. Pervaporation is seen as a separation process, with low energy consumption, which has a high potential for application in the fermentation and dehydration of ethanol. This work presents the experimental ethanol recovery by pervaporation and the semi-empirical model of partial fluxes. Total permeate fluxes between 15.6–68.6 mol m−2 h−1 (289–1565 g m−2 h−1), separation factor between 3.4–6.4 and ethanol molar fraction between 16–171 mM (4–35 wt%) were obtained using ethanol feed concentrations between 4–37 mM (1–9 wt%), temperature between 34–50 ∘C and commercial polydimethylsiloxane (PDMS) membrane. From the experimental data a semi-empirical model describing the behavior of partial-permeate fluxes was developed considering the effect of both the temperature and the composition of the feed, and the behavior of the apparent activation energy. Therefore, the model obtained shows a modified Arrhenius-type behavior that calculates with high precision the partial-permeate fluxes. Furthermore, the versatility of the model was demonstrated in process such as ethanol recovery and both ethanol and butanol dehydration.

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Rokhati, Nur, Asep Muhamad Samsudin, Aji Prasetyaningrum, Ishlahuddin Al Madany, and Muchammad Farhan. "CARRAGEENAN AND CHITOSAN MEMBRANES FOR ETHANOL PERVAPORATION." International Journal of Applied Science and Engineering Review 05, no. 06 (2024): 19–31. https://doi.org/10.52267/ijaser.2024.5602.

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Pervaporation is an energy-efficient membrane-based separation process that effectively separates azeotropic mixtures without requiring additives. Hydrophilic membranes are particularly suitable for ethanol dehydration. This study explores the pervaporation-dehydration of ethanol using a carrageenanchitosan composite membrane supported by polyethersulfone (PES) and crosslinked with glutaraldehyde. The membrane's hydrophilicity enables selective water permeation, which is evaluated through swelling degree measurements. Results indicate that membranes without chitosan exhibit the highest swelling degree, while increasing chitosan content reduces swelling. Scanning electron microscopy (SEM) reveals distinct structural differences between the carrageenan-chitosan layer and the PES support, with crosslinked membranes displaying compact bonding between layers. Optimal pervaporation performance was achieved with a carrageenan-to-chitosan ratio of 1:1, a glutaraldehyde concentration of 1%, and an immersion time of 2 hours.

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Eagan, Nathaniel M., Benjamin M. Moore, Daniel J. McClelland, et al. "Catalytic synthesis of distillate-range ethers and olefins from ethanol through Guerbet coupling and etherification." Green Chemistry 21, no. 12 (2019): 3300–3318. http://dx.doi.org/10.1039/c9gc01290g.

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Xing, Ruisi, Fusheng Pan, Jing Zhao, et al. "Enhancing the permeation selectivity of sodium alginate membrane by incorporating attapulgite nanorods for ethanol dehydration." RSC Advances 6, no. 17 (2016): 14381–92. http://dx.doi.org/10.1039/c5ra26757a.

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Hasegawa, Yasuhisa, Chie Abe, and Ayumi Ikeda. "Pervaporative Dehydration of Organic Solvents Using High-Silica CHA-Type Zeolite Membrane." Membranes 11, no. 3 (2021): 229. http://dx.doi.org/10.3390/membranes11030229.

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A high-silica chabazite (CHA) type zeolite membrane was prepared on the porous α-Al2O3 support tube by the secondary growth of seed particles. The dehydration performances of the membrane were determined using methanol, ethanol, 2-propanol, acetone, acetic acid, methyl ethyl ketone (MEK), tetrahydrofuran (THF), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and N-methyl-2-pyrolidone (NMP) at 303–373 K. As a result, the dehydration performances of the membrane were categorized to following three types: (1) 2-propanol, acetone, THF, and MEK; (2) ethanol and acetic acid; and (3) methanol, DMF, and DMSO, and NMP. The adsorption isotherms of water, methanol, ethanol, and 2-propanol were determined to discuss the influences of the organic solvents on the permeation and separation performances of the membrane. For 2-propanol, acetone, MEK, and THF solutions, the high permeation fluxes and separation factors were obtained because of the preferential adsorption of water due to molecular sieving. In contrast, the permeation fluxes and separation factors were relatively low for methanol, DMF, and DMSO, and NMP solutions. The lower dehydration performance for the methanol solution was due to the adsorption of methanol. The permeation fluxes for ethanol and acetic acid solution were ca. 1 kg m−2 h−1. The significantly low flux was attributed to the similar molecular diameter to the micropore size of CHA-type zeolite.

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Muna, Izza Aliyatul, Firman Kurniawansyah, Mahfud Mahfud та Achmad Roesyadi. "Temperature and Cr-Co ratio on Production of Diethyl Ether from Ethanol Dehydration using Cr-Co/γ-Al2O3 Catalyst". Bulletin of Chemical Reaction Engineering & Catalysis 19, № 4 (2024): 658–67. https://doi.org/10.9767/bcrec.20237.

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The running down of fossil fuels and rising environmental concerns, there is an increasing emphasis on identifying eco-friendly alternative energy sources. Diethyl ether (DEE) is considered one such additive fuel that can replace fossil fuels. In this study, DEE was synthesized through the reaction dehydration of ethanol using γ-alumina catalysts impregnated with chromium and cobalt. The dehydration of ethanol performed in a fixed bed reactor using Cr-Co/γ-Al2O3catalysts loading. The effect of metal ratio of Cr-Co was examined. Catalyst characterization was carried out using XRD, BET, and SEM-EDX analyses. The dehydration reaction was conducted in a fixed-bed reactor at temperatures 100 to 200 ºC, with nitrogen gas flowrates between 200 and 600 mL/min as the carrier gas. The findings revealed that the increase chromium contents, and the temperature were augmenting the diethyl ether yield. And the increase of nitrogen flow rate is slightly increasing the yield of DEE and conversion of ethanol. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Deng, Li, Shaobo Han, Di Zhou, Yong Li та Wenjie Shen. "Morphology dependent effect of γ-Al₂O₃ for ethanol dehydration: nanorods and nanosheets". CrystEngComm 24, № 4 (2022): 796–804. http://dx.doi.org/10.1039/d1ce01316e.

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