Artykuły w czasopismach: „Water-ethanol mixture”

1

Ma, Sijia. "Inter-molecular interactions between water and ethanol". Advances in Engineering Technology Research 4, nr 1 (18.03.2023): 515. http://dx.doi.org/10.56028/aetr.4.1.515.2023.

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The structure and properties of alcohol-water mixtures are of great significance in the study of mass transfer theory and industrial applications. When dissolving in water, alcohols form hydrogen bonds with water, further complicating the properties of the binary mixture. The properties of the mixture they form are quite different from those of the corresponding pure substance. However, although ethanol-aqueous solutions have been widely used, the physical and chemical properties of ethanol-aqueous solutions have not been thoroughly explained. In this paper, various physical changes of ethanol and water after dissolution were observed by experiments, and the possible causes of these changes were analyzed from the perspective of molecular dynamics. It is of positive significance to further understand the molecular interaction between ethanol and water in mixtures and the properties of ethanol aqueous solution.

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2

Belšak, Grega, Saša Bajt i Božidar Šarler. "Numerical Study of the Micro-Jet Formation in Double Flow Focusing Nozzle Geometry Using Different Water-Alcohol Solutions". Materials 14, nr 13 (28.06.2021): 3614. http://dx.doi.org/10.3390/ma14133614.

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The purpose of this work is to determine, based on the computational model, whether a mixture of a binary liquid is capable of producing longer, thinner and faster gas-focused micro-jets, compared to the mono-constituent liquids of its components. Mixtures of water with two different alcohols, water + ethanol and water + 2-propanol, are considered. The numerical study of pre-mixed liquids is performed in the double flow focusing nozzle geometry used in sample delivery in serial femtosecond crystallography experiments. The study reveals that an optimal mixture for maximizing the jet length exists both in a water + ethanol and in a water + 2-propanol system. Additionally, the use of 2-propanol instead of ethanol results in a 34% jet length increase, while the jet diameters and velocities are similar for both mixtures. Pure ethanol and pure 2-propanol are the optimum liquids to achieve the smallest diameter and the fastest jets. However, the overall aim is to find a mixture with the longest, the smallest and the fastest jet. Based on our simulations, it appears that water + 2-propanol mixture might be slightly better than water + ethanol. This study reveals the dominant effect of liquid viscosity on the jet breakup process in a flow focusing nozzles operated under atmospheric conditions.

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Cerempei, Valerian. "Temperature Influence on Phase Stability of Ethanol-Gasoline Mixtures". Chemistry Journal of Moldova 6, nr 1 (czerwiec 2011): 69–72. http://dx.doi.org/10.19261/cjm.2011.06(1).10.

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The article investigates phase stability of ethanol-gasoline mixtures depending on their composition, water concentration in ethanol and ethanol-gasoline mixture and temperature. There have been determined the perfect functioning conditions of spark ignition engines fueled with ethanol-gasoline mixtures.

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Hoffmann, Ingo, Firoz Malayil Kalathil, Tobias Lopian, Didier Touraud, Orsolya Czakkel, Marie Plazanet i Christiane Alba-Simionesco. "Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water". EPJ Web of Conferences 272 (2022): 01003. http://dx.doi.org/10.1051/epjconf/202227201003.

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In view of getting a quantitative picture of the dynamics in mixtures of hydrogen-bonded liquids, in particular the ternary water-ethanol-octanol, we examine in this paper the dynamics of two binary systems: ethanol-water and ethanol-octanol. Our multiscale investigation includes quasi-elastic neutron scattering for the characterization of the dynamics at the molecular scale, completed by NMR at the mesoscopic scale and eventually compared with macroscopic viscosity properties. We highlight the decrease of diffusivity in pure alcohols when increasing the lengthscale and conjecture its relation with the two processes measured in dielectric spectroscopy. While the behaviour of ethanol-water is well understood, unexpected inversion of the slowest component between the micro and the mesoscale are evidenced in the ethanol-octanol mixture. This effect could be at the origin of the negative viscosity excess in the mixture of alcohols.

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5

Aazza, Smail. "Application of Multivariate Optimization for Phenolic Compounds and Antioxidants Extraction from Moroccan Cannabis sativa Waste". Journal of Chemistry 2021 (20.08.2021): 1–11. http://dx.doi.org/10.1155/2021/9738656.

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A statistical simplex centroid design methodology was applied to determine the effects of different solvents and their mixtures on the yield, total polyphenol content, 2′2-dipheny-l-picrylhydrazyl (DPPH) radical scavenging activity, and ferric reducing antioxidant power (FRAP) of extracts from the waste of Cannabis sativa. The different extractor solvents (ethanol, methanol, water, and hexane) and their binary and ternary combinations were evaluated. The experimental results and their response surface models showed that the highest TPC yield values occur with the binary interaction between water and ethanol around the proportion of (ethanol, 70%; water, 30%). The desirability function showed that the optimal conditions were for TPC extraction ternary mixtures which consisted of 75% ethanol, 12.5% methanol, and 12.5% water. Ternary mixtures including water and binary mixture (ethanol 50% to 75%) yielded extracts with the best DPPH antioxidant activity, whereas pure methanol was the best solvent for extracting molecules with FRAP antioxidant capacity. The desirability function including all responses showed that the optimal solvent mixture consisted of 25% ethanol and 75% methanol.

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Mekala, Mallaiah, Bhoopal Neerudi, Padma Rao Are, Raviteja Surakasi, G. Manikandan, Vighneswara Rao Kakara i Aditya Abhaykumar Dhumal. "Water Removal from an Ethanol-Water Mixture at Azeotropic Condition by Adsorption Technique". Adsorption Science & Technology 2022 (14.04.2022): 1–10. http://dx.doi.org/10.1155/2022/8374471.

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The separation of ethanol-water mixture is employed in the present work to produce pure ethanol, the present investigation on the separation of water from the ethanol to achieve pure ethanol by adsorption process. The different parameters like quantity of adsorbent, flow rate of feed mixture, and different adsorbents which are zeolite 3A, zeolite 4A, and silica gel are selected to study purification of ethanol by adsorption. The effect of process parameter for purification is also recorded and studied to evaluate the performance of adsorption equipment and adsorbent. The experiments are conducted at 30°C. The feed mixture is 95.6% (v/v) concentration of ethanol and 4.4% (v/v) of water. The designed adsorption column is suitable for purification of ethanol. The highest ethanol concentration 99.9443% obtained at 20 ml/min flow rate of feed mixture using 50 g of zeolite.

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Feng, Shanghuan, Rufei Wei, Mathew Leitch i Chunbao Charles Xu. "Comparative study on lignocellulose liquefaction in water, ethanol, and water/ethanol mixture: Roles of ethanol and water". Energy 155 (lipiec 2018): 234–41. http://dx.doi.org/10.1016/j.energy.2018.05.023.

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Davletbaeva, Ilsiya M., Alexander V. Klinov, Alina R. Khairullina, Alexander V. Malygin i Nikolay V. Madaminov. "Vapor–Liquid Equilibrium in Binary and Ternary Azeotropic Solutions Acetonitrile-Ethanol-Water with the Addition of Amino Esters of Boric Acid". Processes 10, nr 10 (19.10.2022): 2125. http://dx.doi.org/10.3390/pr10102125.

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The effect of amino esters of boric acid (AEBA) on the conditions of vapor–liquid equilibrium in binary mixtures of acetonitrile–water, ethanol–acetonitrile and a three-component mixture of ethanol-acetonitrile-water was investigated. Residual curves and vapor–liquid phase equilibrium conditions (TPXY data) were experimentally measured at atmospheric pressure for a binary mixture of acetonitrile-AEBA and a triple mixture of acetonitrile-water-AEBA. Previously unknown energy binary parameters of groups B, CH2N with group CH3CN were determined for the UNIFAC model. The correction of the value of the binary parameter water—acetonitrile was carried out. On the basis of thermodynamic modeling, the degree of influence of AEBA on the relative volatility of acetonitrile in binary and ternary mixtures was analyzed. It is shown that the use of AEBA removes all azeotropic points in the studied mixtures. In this case, acetonitrile turns out to be a volatile component, and water is a non-volatile component in the entire concentration range.

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9

Tanimura, Shinobu, Shin-ichi Nakao i Shoji Kimura. "Ethanol-selective membrane for reverse osmosis of ethanol/water mixture". AIChE Journal 36, nr 7 (lipiec 1990): 1118–20. http://dx.doi.org/10.1002/aic.690360719.

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10

Choudhury, J. P., P. Ghosh i B. K. Guha. "Separation of ethanol from ethanol?water mixture by reverse osmosis". Biotechnology and Bioengineering 27, nr 7 (lipiec 1985): 1081–84. http://dx.doi.org/10.1002/bit.260270725.

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11

Wen, Jing, Hao Shen, Yan-Rong Zhai i Feng-Shou Zhang. "Simulation of DNA in water/ethanol mixture". Physica A: Statistical Mechanics and its Applications 450 (maj 2016): 515–22. http://dx.doi.org/10.1016/j.physa.2015.12.091.

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Steltenpohl, Pavol, Anna Holečková i Elena Graczová. "Modeling of transport properties of binary mixtures including ionic liquids based on their experimental estimation". Acta Chimica Slovaca 15, nr 1 (1.01.2022): 123–30. http://dx.doi.org/10.2478/acs-2022-0014.

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Abstract Transport properties of selected imidazolium ionic liquids (1-ethyl-3-methylimidazolium acetate, [emim][ac], and 1-butyl-3-methylimidazolium trifluoromethanesulfonate, [bmim][triflate]) as well as of binary mixtures of these ILs with water and ethanol were estimated experimentally. Density data were obtained within the temperature range of 293.15—333.15 K and used for the excess molar volume calculations. For the binary mixtures comprising selected ionic liquids and water/ethanol, partial molar volumes of mixture components were computed and the excess molar volume variation with the mixture composition was correlated using the Redlich-Kister equation. Dependence of viscosity on the binary mixture composition and temperature was described using the Jouyban-Acree model. These data form a base for the assessment of OPEX connected with transportation of mixtures containing these ionic liquids.

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13

Regragui, Anissa, Nadia Merzouk, Faissal Tarras, Najib Al Idrissi i Azzouz Essamri. "Experimental Dehydration of the Water-Ethanol Mixture by Pervaporation through Membranes Based on Polyvinyl Alcohol: What Conditions for Better Performance?" International Journal of Membrane Science and Technology 10, nr 1 (28.03.2023): 47–55. http://dx.doi.org/10.15379/ijmst.v10i1.1100.

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Abstract: The separation processes are of paramount importance in the industrial field. The techniques used to obtain separation membranes depend on the type of membrane and the applications envisaged. Aim: The objective of the study is to focus on the master membrane allowing better pervaporation of the water-ethanol mixture by varying various parameters such as the polymer content, the polyacrylic acid (PAA) content and the operating variables such as the drying temperature and the stay in the oven. Materials: We fabricated membranes to separate water-ethanol mixtures by the pervaporation process. First, films based on polyvinyl alcohol and acid polyacrylics were prepared using the appropriate solvent (water) with different PAA contents. We then characterized these films using the technique of infrared spectroscopy and the measurement of swelling of these membranes in water / ethanol mixtures. Pervaporation tests were carried out to measure the selectivity and flow of these films with respect to the mixture. Results: All the membranes exhibit a higher permeation flux than that of pure PVA, especially when the PAA content is high. The selectivity to water of these crosslinked membranes, represented by the water content in the permeate is appreciable. Conclusion: The addition of PAA to PVA makes possible the improvement of swelling, the flow is improved as well as the water selectivity and the permeability of the membrane which makes the PVA-PAA alloy a simple and effective method to ensure dehydration of the Water-Ethanol mixture.

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Regragui, Anissa, Nadia Merzouk, Faissal Tarras, Najib Al Idrissi i Azzouz Essamri. "Experimental Dehydration of the Water-Ethanol Mixture by Pervaporation through Membranes Based on Polyvinyl Alcohol: What Conditions for Better Performance?" Int. J. of Membrane Science and Technology 10, nr 1 (28.03.2023): 47–55. http://dx.doi.org/10.15379/2410-1869.2023.10.01.06.

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Abstract: The separation processes are of paramount importance in the industrial field. The techniques used to obtain separation membranes depend on the type of membrane and the applications envisaged. Aim: The objective of the study is to focus on the master membrane allowing better pervaporation of the water-ethanol mixture by varying various parameters such as the polymer content, the polyacrylic acid (PAA) content and the operating variables such as the drying temperature and the stay in the oven. Materials: We fabricated membranes to separate water-ethanol mixtures by the pervaporation process. First, films based on polyvinyl alcohol and acid polyacrylics were prepared using the appropriate solvent (water) with different PAA contents. We then characterized these films using the technique of infrared spectroscopy and the measurement of swelling of these membranes in water / ethanol mixtures. Pervaporation tests were carried out to measure the selectivity and flow of these films with respect to the mixture. Results: All the membranes exhibit a higher permeation flux than that of pure PVA, especially when the PAA content is high. The selectivity to water of these crosslinked membranes, represented by the water content in the permeate is appreciable. Conclusion: The addition of PAA to PVA makes possible the improvement of swelling, the flow is improved as well as the water selectivity and the permeability of the membrane which makes the PVA-PAA alloy a simple and effective method to ensure dehydration of the Water-Ethanol mixture.

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15

Chen, Hong Liang, Ji Song Yang, Yan Wang, Hui Ying Li, Xin Xin Li i Wei Shen Yang. "Preparation of Silicalite-1 Membranes with Seeding Method and its Separation Performance for Low Ethanol/Water Mixture". Advanced Materials Research 807-809 (wrzesień 2013): 591–95. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.591.

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High performance silicalite-1 membranes were successfully synthesized on silica tubes by seeding method after filling the tubes with water and glycerol mixtures. After seeding the silica tubes with 200 nm seeds, all the silicalite-1 membranes show acceptable separation performance towards ethanol/water mixture after 4-12 h hydrothermal synthesis, and the highest flux of membrane with 8 h hydrothermal synthesis reaches about 0.98 kg/m2.h and the separation factor reaches about 60 towards 3 wt.% ethanol/water mixture. This result shows that the as-synthesized silicalite-1 membrane can concentrate the ethanol from 3% to about 65%, and the ethanol can be obtained over 600 g/m2.h by using the silicalite-1 membrane, which shows that seeding method and suitable control of synthesis conditions is possible for preparing high-performance silicalite-1 membranes.

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16

Aydi, Abdelkarim, Cherifa Ayadi, Kaouther Ghachem, Abdulaal Al-Khazaal, Daniel Delgado, Mohammad Alnaief i Lioua Kolsi. "Solubility, Solution Thermodynamics, and Preferential Solvation of Amygdalin in Ethanol + Water Solvent Mixtures". Pharmaceuticals 13, nr 11 (16.11.2020): 395. http://dx.doi.org/10.3390/ph13110395.

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The equilibrium solubility of amygdalin in [ethanol (1) + water (2)] mixtures at 293.15 K to 328.15 K was reported. The thermodynamic properties (standard enthalpy ΔsolnH°, standard entropy ΔsolnS°, and standard Gibbs energy of solution ΔsolnG°) were computed using the generated solubility data via van’t Hoff and Gibbs equations. The dissolution process of amygdalin is endothermic and the driving mechanism in all mixtures is entropy. Maximal solubility was achieved in 0.4 mole fraction of ethanol at 328.15 K and the minimal one in neat ethanol at 293.15 K. Van’t Hoff, Jouyban–Acree–van’t Hoff, and Buchowski–Ksiazczak models were used to simulate the obtained solubility data. The calculated solubilities deviate reasonably from experimental data. Preferential solvation parameters of amygdalin in mixture solvents were analyzed using the inverse Kirkwood–Buff integrals (IKBI) method. Amygdalin is preferentially solvated by water in ethanol-rich mixtures, whereas in water-rich mixtures, there is no clear evidence that determines which of water or ethanol solvents would be most likely to solvate the molecule.

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Istiqomah, Ana Ulfa, Fitria Rahmawati i Khoirina Dwi Nugrahaningtyas. "REPLACING SODA ASH (NaOH) WITH KALIUM HYDROXYDE (KOH) IN DESTILATION OF BINARY ETHANOL-WATER MIXTURE". ALCHEMY Jurnal Penelitian Kimia 12, nr 2 (1.09.2016): 179. http://dx.doi.org/10.20961/alchemy.12.2.1876.179-189.

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Soda ash (NaOH) has been used in bioethanol production in the second step destillation to increase the purity up to 90%. The destillation process will produce waste water with a high sodium content. The soda ash itself serve as an electrolyte to modify the colligative properties of the water-ethanol mixture allowing the disappearance of azeotropic point. This research aims to study the replacement of NaOH with KOH, in which the kalium is a nutrient to maintain soil fertility. This research study the thermodynamics properties, vapor-liquid equilibrium, colligative properties and also its azeotropic point in the destillation of water-ethanol mixture when KOH and NaOH were used as the additive. A model of water-ethanol mixture at a various composition of 0-100 weight % of ethanol was used. The electrolyte addition was 0.1 mol electrolyte/total weight of ethanol-water. The result shows that the addition of electrolyte into ethanol-water mixture eliminate the azeotropic point and allows the ethanol molecules to separate from water. The enthalpy of mixing between water-ethanol is 239.601 kJ/mol. It becomes 259.796 kJ/mol and 264.793 kJ/mol after the addition of NaOH and KOH, respectively. It confirming the endothermic mixing process due to different polarity between water and ethanol. The presence of electrolyte even reduce more their molecular interaction. However, the change to irregularity result a high positive entropy values that result the negative Gibbs free energy. It confirms the spontaneity of mixing. The vaporization enthalpy, Hvap, of water-ethanol mixture is 76.229 kJ/mol and it becomes 235.366 kJ/mol and 126.189 kJ/mol after the addition of NaOH and KOH. It indicates that the presence of electrolyte inhibites vaporization of water as the major component and allowing ethanol molecules to vapor producing more high purity ethanol.

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Istiqomah, Ana Ulfa, Fitria Rahmawati i Khoirina Dwi Nugrahaningtyas. "REPLACING SODA ASH (NaOH) WITH KALIUM HYDROXYDE (KOH) IN DESTILATION OF BINARY ETHANOL-WATER MIXTURE". ALCHEMY Jurnal Penelitian Kimia 12, nr 2 (1.09.2016): 179. http://dx.doi.org/10.20961/alchemy.v12i2.1876.

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Soda ash (NaOH) has been used in bioethanol production in the second step destillation to increase the purity up to 90%. The destillation process will produce waste water with a high sodium content. The soda ash itself serve as an electrolyte to modify the colligative properties of the water-ethanol mixture allowing the disappearance of azeotropic point. This research aims to study the replacement of NaOH with KOH, in which the kalium is a nutrient to maintain soil fertility. This research study the thermodynamics properties, vapor-liquid equilibrium, colligative properties and also its azeotropic point in the destillation of water-ethanol mixture when KOH and NaOH were used as the additive. A model of water-ethanol mixture at a various composition of 0-100 weight % of ethanol was used. The electrolyte addition was 0.1 mol electrolyte/total weight of ethanol-water. The result shows that the addition of electrolyte into ethanol-water mixture eliminate the azeotropic point and allows the ethanol molecules to separate from water. The enthalpy of mixing between water-ethanol is 239.601 kJ/mol. It becomes 259.796 kJ/mol and 264.793 kJ/mol after the addition of NaOH and KOH, respectively. It confirming the endothermic mixing process due to different polarity between water and ethanol. The presence of electrolyte even reduce more their molecular interaction. However, the change to irregularity result a high positive entropy values that result the negative Gibbs free energy. It confirms the spontaneity of mixing. The vaporization enthalpy, Hvap, of water-ethanol mixture is 76.229 kJ/mol and it becomes 235.366 kJ/mol and 126.189 kJ/mol after the addition of NaOH and KOH. It indicates that the presence of electrolyte inhibites vaporization of water as the major component and allowing ethanol molecules to vapor producing more high purity ethanol.

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19

Iyota, Hidemi, i Kinsi Motomura. "Adsorption of 2-(Octylsulfinyl)ethanol at Ethanol–Water Mixture/Air Interface". Bulletin of the Chemical Society of Japan 62, nr 5 (maj 1989): 1446–50. http://dx.doi.org/10.1246/bcsj.62.1446.

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Al-yaqoobi, Atheer, David Hogg i William B. Zimmerman. "Microbubble Distillation for Ethanol-Water Separation". International Journal of Chemical Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/5210865.

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In the current study, a novel approach for separating ethanol-water mixture by microbubble distillation technology was investigated. Traditional distillation processes require large amounts of energy to raise the liquid to its boiling point to effect removal of volatile components. The concept of microbubble distillation by comparison is to heat the gas phase rather than the liquid phase to achieve separation. The removal of ethanol from the thermally sensitive fermentation broths was taken as a case of study. Consequently the results were then compared with those which could be obtained under equilibrium conditions expected in an “ideal” distillation unit. Microbubble distillation has achieved vapour compositions higher than that which could be obtained under traditional equilibrium conditions. The separation was achieved at liquid temperature significantly less than the boiling point of the mixture. In addition, it was observed that the separation efficiency of the microbubble distillation could be increased by raising the injected air temperature, while the temperature of the liquid mixture increased only moderately. The separation efficiency of microbubble distillation was compared with that of pervaporation for the recovery of bioethanol from the thermally sensitive fermentation broths. The technology could be controlled to give high separation and energy efficiency. This could contribute to improving commercial viability of biofuel production and other coproducts of biorefinery processing.

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Ghazoyan, Heghine H., i Shiraz A. Markaryan. "VOLUMETRIC PROPERTIES OF SOLUTIONS OF DIMETHYLSULFONE IN ETHANOL-WATER MIXTURE AT TEMPERATURES RANGE OF 298.15-323.15 K". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 60, nr 7 (24.08.2017): 27. http://dx.doi.org/10.6060/tcct.2017607.5564.

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This paper studies volumetric properties of ternary dimethylsulfone-ethanol-water systems. The biomedical and environmental significance for the fundamental investigations of aqueous solution of dimethylsulfone and influences of third component on volumetric behavior of this system arises from several reasons. In the global sulfur cycle dimethylsulfide is converted to dimethylsulfone leading to an annual atmospheric production of some million tones of dimethylsulfone, much of which would be deposited in rain and snow. In addition, dimethylsulfone has been extensively studied from a medical point of view. It was established that dimethylsulfone is contained in small amounts in human blood and urine. Also of interest is that methionine is transformed into dimethylsulfone in living organisms. In this work densities of solution of dimethylsulfone in ethanol-water mixtures with various compositions have been measured over available concentration range. As it is evident from experimental data, the increase in a temperature leads to the reduction of density. The apparent and partial molar volumes of solutions were determined over the 298.15–323.15K temperature range. As it follows from these data, the apparent molar volumes increase with increasing of temperature. The influence of ethanol on the volumetric behavior has been taken into account by changing the apparent molar volume compared with the apparent molar volume of the binary aqueous solutions of DMSO2. It is found also the effect of the amount of ethanol on the volumetric properties of these solutions. It is interesting that the effect of ethanol on the values of apparent molar volumes does not change monotone with increasing in quantity of ethanol in ethanol-water mixture. In dimethylsulfone+(ethanol-water) solutions the partial molar volume of dimethylsulfone increases when quantity of ethanol in ethanol-water mixture more than 0.5 molar fraction. The observed phenomena are explained by the presence of competition of intermolecular interactions. In the DMSO2-ethanol-water system the strongest interaction between ethanol and water molecules leads to the increase in partial molar volumes for DMSO2.For citation:Ghazoyan H.H., Markaryan S.A. Volumetric properties of solutions of dimethylsulfone in ethanol-water mixture at tempe-ratures range of 298.15-323.15 K. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 7. P. 27-33.

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Yamaguchi, Tsuyoshi, Song-Ho Chong i Norio Yoshida. "Phase equilibrium of three-component liquid systems composed of water, alcohol, and sodium chloride studied by the reference interaction-site model integral equation theory". Journal of Chemical Physics 158, nr 8 (28.02.2023): 084502. http://dx.doi.org/10.1063/5.0142256.

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A theoretical method for calculating the thermodynamic properties and phase equilibria of a binary liquid mixture using the reference interaction-site model (RISM) integral equation theory, which we had proposed recently, was extended to ternary liquid systems containing salt. A novel dielectric correction of the RISM theory for a mixture of solvents was also proposed. The theory was applied to mixtures composed of water, alcohol, and NaCl, where the alcohol was either methanol or ethanol. The decrease in NaCl solubility with increasing alcohol molar fractions in the solvent was calculated. In the ethanol system, the theory yielded salt-induced liquid–liquid phase separation, which was observed experimentally in a ternary mixture of water, 1-propanol, and NaCl. The phase diagram of the ternary system was determined theoretically.

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Claverie, Marie, François Martin, Christel Careme, Christophe Le Roux, Pierre Micoud, Olivier Grauby i Cyril Aymonier. "Flow supercritical synthesis of brucite and magnesian T-O, T-O-T phyllosilicates: an opportunity to tune the structure with the solvent composition". Clay Minerals 53, nr 3 (wrzesień 2018): 497–503. http://dx.doi.org/10.1180/clm.2018.36.

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ABSTRACTThis work presents the synthesis of minerals with a layered structure in supercritical water/ethanol mixtures to decrease the critical coordinates of the solvent regarding water. Depending on the water/ethanol ratio of the solvent, we obtained three different minerals adopting an octahedral brucitic sheet: (1) without a Si-tetrahedral sheet (O); (2) associated with one Si-tetrahedral sheet (T-O); or (3) intercalated between two Si-tetrahedral sheets (T-O-T). We have thus shown that ethanol in a supercritical water/ethanol mixture changes the solubility of silicon with a direct consequence on the formation of the tetrahedral silicon sheets and thus makes it possible to control the structure of the synthesized layered material.

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Sano, Tsuneji, Hiroshi Yanagishita, Yoshimichi Kiyozumi, Dai Kitamoto i Fujio Mizukami. "Separation of Ethanol/Water Mixture by Silicalite Membrane". Chemistry Letters 21, nr 12 (grudzień 1992): 2413–14. http://dx.doi.org/10.1246/cl.1992.2413.

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Amo, Yuko, i Yasunori Tominaga. "Low-frequency Raman study of ethanol–water mixture". Chemical Physics Letters 320, nr 5-6 (kwiecień 2000): 703–6. http://dx.doi.org/10.1016/s0009-2614(00)00304-3.

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Kanin, P. K., T. A. Gubanova, A. R. Zabirov i V. V. Yagov. "Investigating the effect of submerged impingement jet on heat transfer in water-alcohol mixtures". Journal of Physics: Conference Series 2057, nr 1 (1.10.2021): 012037. http://dx.doi.org/10.1088/1742-6596/2057/1/012037.

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Abstract This paper presents new results of experiments on spherical sample cooling with submerged impingement jet in subcooled water-alcohol mixtures. The influence of the ethanol concentration on the occurrence of intensive boiling regime is detected. Experiments are carried out on a stainless-steel sample in a water-ethanol mixture, in a wide range of concentrations and temperatures. The result includes an increase of the heat transfer intensity at exposure of the submerged impingement jet. The intensive boiling regime is detected with a higher ethanol content compared to experiments in a calm liquid.

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Stefan, Claudia Simona, Elena Roxana Chiriac, Oana Dragostin, Elena Lacramioara Lisa i Maria Cioroi. "Study of Benzoic Acid Solubility in Imidazolium Formate as Pure Ionic Liquid and Its Binary Aqueous Mixtures". Revista de Chimie 68, nr 10 (15.11.2017): 2256–60. http://dx.doi.org/10.37358/rc.17.10.5866.

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The determination of benzoic acid (BAc) solubility in pure imidazolium formate (ImForm) and their aqueous mixtures of [ImForm/water], was performed by the acid-base titration of the saturated solutions. [ImForm/water] solutions were tested using an ImForm concentration ranging from 1.66-4.33 g/L. The BAc solubility in pure ionic liquid was compared with that of some common organic solvents reported in literature, such as: ethanol, chloroform, cyclohexane. The highest solubility of BAc was for pure ImForm (from 1073 g/L at 293 K up to 2200 g/L at 323 K), the determined values being superior to BAc solubility in organic solvents mentioned. The results confirm that the polar solvents, such as ImForm and ethanol, present the highest BAc solubility values. At 293 K, the mole fraction of BAc in pure ImForm was 2.8 times higher than the mole fraction of BAc in ethanol. The BAc solubility in binary mixtures [ImForm/water] was compared with that determined in [NaCl/water] mixtures. At the same salt concentration, ranging from 1.66 to 4.33 g/L, at a constant working temperature (323 K), the increasing concentration of NaCl lowers the solubility of BAc. In opposite, the increasing of ImForm concentration determines a considerable increase in BAc solubility into the [ImForm/water] mixture. At 277 K, for 1.66 g/L salt concentration in water, the BAc solubility in [salt/water] solvents shows very similar values (~1.3 g/L) for both [ImForm/water] and [NaCl/water]. If the temperature increases to 323 K, the BAc solubility in [ImForm/water] mixture is about 1.5 times higher than that of solubility in distillated water and 2.5 times higher compared to that in [NaCl/water]. It was concluded that the benzoic acid presents a great solubility in pure ImForm and in its [ImForm/water] aqueous mixture.

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Morales-Moctezuma, Marissa D., i Sebastian G. Spain. "The effects of cononsolvents on the synthesis of responsive particles via polymerisation-induced thermal self-assembly". Polymer Chemistry 12, nr 32 (2021): 4696–706. http://dx.doi.org/10.1039/d1py00396h.

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Responsive nanogels were synthesised via RAFT-mediated polymerisation-induced thermal self-assembly in cononsolvent mixtures of water and ethanol. The solvent mixture affected the particle size, tacticity and thermal properties.

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Sharda, Sharda, i Rajayashree Pandey. "A Polarographic study of Pb (П) complexes with Bupropion hydrochloride in 40% ethanol-water mixture". International Journal of Scientific Research 3, nr 5 (1.01.2012): 43–45. http://dx.doi.org/10.15373/22778179/may2014/14.

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Karpova, M. O., N. V. Makarova, D. F. Ignatova i D. V. Budylin. "Determination of the type of solvent in the technology of production of tea extracts with antioxidant activity". Proceedings of the Voronezh State University of Engineering Technologies 82, nr 4 (20.01.2021): 169–78. http://dx.doi.org/10.20914/2310-1202-2020-4-169-178.

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The aim of the study was to determine the type of solvent that allows the most complete extraction of antioxidant substances from white, black and green tea (Camellia sinensis). The objects of the study were extracts of three types of tea obtained using various solvents: water, a mixture of water-ethanol (75% vol./25% vol.), A mixture of water-ethanol (50% vol./50% vol.), A mixture of water -ethanol (25% vol./75% vol.) and ethanol (96%). In extracts of white, black and green tea, the total content of phenolic substances, flavonoids, antiradical activity by the DPPH method, and the restoring force by the FRAP method were determined. The maximum values of the total content of phenolic substances were found in the extract of white tea based on ethanol and a water-ethanol solvent system (50/50), black tea when extracted with water, green tea with a water-ethanol solvent ratio (50/50). High values of the total content of flavonoids were established for white tea extract based on a water-ethanol solvent system (50/50), black tea when extracted with water, green tea, when using ethanol as a solvent. Low antiradical activity was found in white tea extract based on a water-ethanol solvent system (50/50), in ethanol-based black tea, and green tea showed low values when extracted with water. The highest index of restorative power was found in white tea extract based on a water-ethanol solvent system (25/75), in black and green tea when extracted with water. Thus, as a result of the study of extracts of white, black and green tea, it was found that when the white tea is extracted with a water-ethanol (50/50) solvent system, the largest amount of antioxidant substances is extracted. The maximum amount of antioxidants from black and green tea is extracted using water as a solvent.

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Le Van, Hieu, Hue Thi Nguyen, Quang Ho Dinh i Van Cao Long. "Influence of Temperature And Concentration of Ethanol on Properties of Borosilicate Glass Photonic Crystal Fiber Infiltrated by Water – Ethanol Mixture". Communications in Physics 28, nr 1 (26.03.2018): 61. http://dx.doi.org/10.15625/0868-3166/28/1/11084.

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In this paper, we present a numerical simulation of the properties of a photonic crystal fiber (PCF) made of borosilicate glass infiltrated by the water-ethanol mixture. We examine the influence of temperature and ethanol concentration for the refractive index, dispersion properties, effective mode area and confinement loss of the fundamental mode by a Lumerical simulation method. We also calculate the fundamental mode of the fiber infiltrated with a water-ethanol mixture with the concentration range of ethanol from 0% to 100% in the temperature range from 10°C to boiling point of ethanol. The results show that all fibers infiltrated with water-ethanol mixture have flat dispersion characteristics in the infrared range above 1.32. The best flatness exists for pure ethanol. Furthermore, it is possible to shift the zero-dispersion wavelength and modify fundamental properties of PCFs by both temperature and concentration of ethanol. The results obtained are important because of that we not only use their reasonable parameters for the design and manufacture but also use them in nonlinear phenomena and nonlinear applications of fibers as supercontinuum generation.

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32

Close, D. J., M. K. Peck, R. F. White i K. J. Mahoney. "Buoyancy-Driven Heat Transfer and Flow Between a Wetted Heat Source and an Isothermal Cube". Journal of Heat Transfer 113, nr 2 (1.05.1991): 371–76. http://dx.doi.org/10.1115/1.2910571.

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This paper describes flow visualization and heat transfer experiments conducted with a heat source inside an isothermal cube filled with a saturated or near-saturated gas/vapor mixture. The mixture was formed by vaporizing liquid from the surface of the heat source, and allowing it to condense on the surfaces of the cube, which was initially filled with a noncondensing gas. Visualization studies showed that for air and ethanol below 35°C, and for air and water, the flow patterns were similar with the hot plume rising from the source. For air and ethanol above 35° C the flow pattern reversed with the hot plume flowing downward. For temperatures spanning 35° C, which is the zero buoyancy temperature for the ethanol/water azeotrope and air, no distinct pattern was observed. Using water, liquid droplets fell like rain throughout the cube. Using ethanol, a fog of droplets moved with the fluid flow. Heat transfer experiments were made with water and air, and conductances between plate and cube of around 580 W·m−2·K−1 measured. Agreement between the similarity theory developed for saturated gas/vapor mixtures, and correlations for single component fluids only, was very good. Together with qualitative support from the visualization experiments, the theory developed in a earlier paper deriving a similarity relationship between single fluids and gas/vapor mixtures has been validated.

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Suarta, I. Made, I. N. G. Wardana, Nurkholis Hamidi i Widya Wijayanti. "The Role of Molecule Clustering by Hydrogen Bond in Hydrous Ethanol on Laminar Burning Velocity". Journal of Combustion 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/5127682.

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The role of hydrogen bond molecule clustering in laminar burning velocities was observed. The water in hydrous ethanol can change the interaction between water-ethanol molecules. A certain amount of water can become oxygenated which increases the burning velocity. The hydrogen bond interaction pattern of ethanol and water molecules was modeled. Based on the molecular model, azeotropic behavior emerges from ethanol-water hydrogen bond, which is at a 95.1%v composition. The interaction with water molecule causes the ethanol molecule to be clustered with centered oxygenated compound. So, it supplies extra oxygen and provides intermolecular empty spaces that are easily infiltrated by the air. In the azeotropic composition, the molecular bond chain is the shortest, so hypothetically the burning velocity is anticipated to increase. The laminar burning velocity of ethanol fuel was tested in a cylindrical explosion bomb in lean, stoichiometric, and rich mixtures. The experimental result showed that the maximum burning velocity occurred at hydrous ethanol of 95.5%v composition. This discrepancy is the result of the addition of energy from 7.7% free ethanol molecules that are not clustered. At the rich mixture, the burning velocity of this composition is higher than that of anhydrous ethanol.

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Baránková, Hana, Ladislav Bardos i Adela Bardos. "Non-Conventional Atmospheric Pressure Plasma Sources for Production of Hydrogen". MRS Advances 3, nr 18 (2018): 921–29. http://dx.doi.org/10.1557/adv.2018.103.

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ABSTRACTThe atmospheric pressure plasma sources with a coaxial geometry were used for generation of the radio frequency, microwave and pulsed dc plasmas inside water and aqueous solutions. Pulsed dc plasma generated in ethanol-water mixtures leads to production of the hydrogen-rich synthesis gas with hydrogen content up to 65 %. The effect of various plasma generation regimes on the performance of plasma, on the hydrogen production efficiency and on the hydrogen-rich synthesis gas production was examined. A role of the composition of the ethanol-water mixture was investigated.

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Lee, Young Moo, Sang Yong Nam i Dong Jin Woo. "Pervaporation Performance of β-Chitosan Membrane for Water/Alcohol Mixtures". Journal of Polymer Engineering 18, nr 1-2 (1.03.1998): 131–46. http://dx.doi.org/10.1515/polyeng-1998-1-211.

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Abstract Composite membranes made of β-chitosan extracted from squid were prepared and crosslinked with sulfuric acid with various crosslinking times. Dehydration performance of the water/ethanol and water/isopropanol mixtures by pervaporation experiments using β-chitosan composite membranes was investigated. Crosslinking and deacetylation degree of the membrane were confirmed by ATR-FT-IR and elemental analysis (EA), respectively. Pervaporation experiments were investigated under various feed concentrations and temperatures. β-Chitosan showed a higher degree of swelling in water than a-chitosan, resulting in a higher flux of β-Chitosan than that of α-chitosan. β-Chitosan composite membranes showed good dehydration performance in pervaporation of a water/alcohol mixture. For water/ethanol mixtures, separation factor (α) - 270; flux (J) - 700 g/m2hr, for water/isopropanol, α - 150; J -1800 g/m2hr, respectively.

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Fanari, Fabio, Giacomo Muntoni, Chiara Dachena, Renzo Carta i Francesco Desogus. "Microwave Heating Improvement: Permittivity Characterization of Water–Ethanol and Water–NaCl Binary Mixtures". Energies 13, nr 18 (17.09.2020): 4861. http://dx.doi.org/10.3390/en13184861.

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Microwave heating offers a lot of advantages compared to conventional heating methods in the chemical reactions field due to its positive effects on reaction time and selectivity. Dielectric properties, and in particular permittivity, of substances and mixtures, are important for the optimization of microwave heating processes; notwithstanding this, specific databases are poor and far from being complete, and in the scientific literature very little data regarding these properties can be found. In this work, impedance measurements were carried out using a specially designed system to get the real and imaginary parts of the dielectric constant. The apparatus was tested in the estimation of permittivity of water–ethanol and water–NaCl mixtures, varying their composition to obtain a wide range of permittivity values. The results were compared to literature data and fitted with available literature models to verify the correspondence between them, finding that permittivity dependence on mixture composition can be effectively described by the models.

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37

Reddy, R. P., i J. H. Lienhard. "The Peak Boiling Heat Flux in Saturated Ethanol–Water Mixtures". Journal of Heat Transfer 111, nr 2 (1.05.1989): 480–86. http://dx.doi.org/10.1115/1.3250702.

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The present work provides original measurements of the burnout heat flux in saturated ethanol–water mixtures, over the full range of concentrations. These data were obtained at atmospheric pressure on horizontal cylinders, ranging from 0.51 to 2.16 mm in diameter. They reveal significant improvements of the peak heat flux for mixtures, over that which would be expected from pure fluids with the properties of the mixture. This improvement is most pronounced at low ethanol mass fractions. McEligot has suggested that the improved heat flux results from a subcooling created by selective distillation at the liquid–vapor interface. Combining this idea with a recent correlation of subcooled burnout, we estimate the extent of effective subcooling qualitatively and discuss the use of this estimate to correlate burnout in binary mixtures. Two dimensionless groups are proposed to characterize this effective subcooling, both based on appropriate characterizations of the phase equilibrium diagram.

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Yan, Junjie, Jinshi Wang, Shenhua Hu, Daotong Chong i Jiping Liu. "MARANGONI CONDENSATION HEAT TRANSFER OF WATER-ETHANOL MIXTURE VAPOR". Journal of Enhanced Heat Transfer 18, nr 4 (2011): 325–43. http://dx.doi.org/10.1615/jenhheattransf.v18.i4.60.

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Lee, Y. K., I. S. Sohn, E. J. Jeon i S. C. Kim. "IPN Membranes for the Pervaporation of Ethanol/Water Mixture". Polymer Journal 23, nr 5 (maj 1991): 427–33. http://dx.doi.org/10.1295/polymj.23.427.

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Mukherjee, Saumyak, Ashish A. Deshmukh, Sayantan Mondal, Balasubramanian Gopal i Biman Bagchi. "Destabilization of Insulin Hexamer in Water–Ethanol Binary Mixture". Journal of Physical Chemistry B 123, nr 49 (14.11.2019): 10365–75. http://dx.doi.org/10.1021/acs.jpcb.9b07689.

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CHEN, S., R. LIOU, C. HSU, D. CHANG, K. YU i C. CHANG. "Pervaporation separation water/ethanol mixture through lithiated polysulfone membrane". Journal of Membrane Science 193, nr 1 (31.10.2001): 59–67. http://dx.doi.org/10.1016/s0376-7388(01)00478-1.

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Wang, Zeng, Xiao-Feng Peng, Arun S. Mujumdar, Ay Su i Duu-Jong Lee. "Evaporation of Ethanol-Water Mixture Drop on Horizontal Substrate". Drying Technology 26, nr 6 (12.05.2008): 806–10. http://dx.doi.org/10.1080/07373930802046526.

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Klinov, A. V., A. R. Fazlyev, A. R. Khairullina, K. A. Alekseev i D. R. Latypov. "EXTRACTIVE RECTIFICATION OF ETHANOL-WATER MIXTURE USING ETHYLENE GLYCOL". Herald Of Technological University 26, nr 1 (2023): 44–47. http://dx.doi.org/10.55421/1998-7072_2023_26_1_44.

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Ooi, Chin Hong, Edward Bormashenko, Anh V. Nguyen, Geoffrey M. Evans, Dzung V. Dao i Nam-Trung Nguyen. "Evaporation of Ethanol–Water Binary Mixture Sessile Liquid Marbles". Langmuir 32, nr 24 (9.06.2016): 6097–104. http://dx.doi.org/10.1021/acs.langmuir.6b01272.

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Makarov, A. A., I. I. Protasevich, N. P. Bazhulina i N. G. Esipova. "Heat denaturation of pepsinogen in a water-ethanol mixture". FEBS Letters 357, nr 1 (2.01.1995): 58–61. http://dx.doi.org/10.1016/0014-5793(94)01308-n.

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Díaz, Juan Camilo, Iván Darío Gil-Chávez, Liliana Giraldo i Juan Carlos Moreno-Piraján. "Separation of Ethanol-Water MixtureUsing Type-A Zeolite Molecular Sieve". E-Journal of Chemistry 7, nr 2 (2010): 483–95. http://dx.doi.org/10.1155/2010/597346.

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This paper presents an experimental procedure for the synthesis of a type-A zeolite molecular sieve, usable in the separation of an ethanol-water mixture. The type-A zeolite molecular sieve is obtained from a reactive mixture formed by a source of alumina, a source of silica and a promoter. Characterization of the molecular sieves obtained in this work was undertaken using X-ray diffraction (XRD), adsorption isotherms and scanning electron microscopy (SEM). The results from the characterization procedures showed that part of the product presented a pore diameter suitable for the separation of an ethanol-water mixture.

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47

Martinez-Frias, Joel, Salvador M. Aceves i Daniel L. Flowers. "Improving Ethanol Life Cycle Energy Efficiency by Direct Utilization of Wet Ethanol in HCCI Engines". Journal of Energy Resources Technology 129, nr 4 (29.06.2007): 332–37. http://dx.doi.org/10.1115/1.2794768.

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Homogeneous charge compression ignition (HCCI) is a new engine technology with fundamental differences over conventional engines. HCCI engines are intrinsically fuel flexible and can run on low-grade fuels as long as the fuel can be heated to the point of ignition. In particular, HCCI engines can run on “wet ethanol:” ethanol-in-water mixtures with high concentration of water. Considering that much of the energy required for processing fermented ethanol is spent in distillation and dehydration, direct use of wet ethanol in HCCI engines considerably shifts the energy balance in favor of ethanol. The results of the paper show that a HCCI engine with efficient heat recovery can operate on a mixture of 35% ethanol and 65% water by volume while achieving a high brake thermal efficiency (38.7%) and very low NOx (1.6ppm, clean enough to meet any existing or oncoming emissions standards). Direct utilization of ethanol at a 35% volume fraction reduces water separation cost to only 3% of the energy of ethanol and coproducts (versus 37% for producing pure ethanol) and improves the net energy gain from 21% to 55% of the energy of ethanol and coproducts. Wet ethanol utilization is a promising concept that merits more detailed analysis and experimental evaluation.

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Sarafraz, M. M., S. M. Peyghambarzadeh i Alavi Fazel. "Experimental studies on nucleate pool boiling heat transfer to ethanol/MEG/DEG ternary mixture as a new coolant". Chemical Industry and Chemical Engineering Quarterly 18, nr 4-1 (2012): 577–86. http://dx.doi.org/10.2298/ciceq111116033s.

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In this paper, nucleate pool boiling heat transfer coefficient of ternary mixtures of ethanol, monoethylene glycol (MEG) and diethylene glycol (DEG) as a new coolant with higher heat transfer coefficient has been investigated. Therefore, at varied concentrations of MEG and DEG and also at different heat fluxes, pool boiling heat transfer coefficients, have been experimentally measured. Results demonstrated the higher heat transfer coefficient in comparison with Water/MEG/DEG ternary mixture. In particular, at high heat fluxes, for ethanol/MEG/DEG mixture, higher boiling heat transfer coefficient is reported. Besides, experimental data were compared to well-known existing correlations. Results of this comparison express that the most accurate correlation for predicting the heat transfer coefficient of ethanol/MEG/DEG is modified Stephan - Preu?er which has been obtained in our earlier work.

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Abubaker, Muhammad, Muhammad Ali, Fahad Noor, Muhammad Imran i Tehmina Ambreen. "Condensate retention of water-ethanol mixture on horizontal enhanced condensing tubes". Thermal Science 23, nr 6 Part A (2019): 3493–500. http://dx.doi.org/10.2298/tsci170629236a.

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Condensate retention has been found an important parameter for heat transfer on horizontal enhanced condensing tubes. In this research, five pin-fin (varying in circumferential pin spacing) and three integral-fin horizontal tubes are investigated for condensate retention angle (which is measured from the top of tooth to the fully flooded flank) using water-ethanol mixture. An attempt was made to find the optimum concentration of ethanol in water for maximum retention angle. Concentration of ethanol was varied in between 0.5% to 1.5% by weight. Data revealed the importance of integral-fin tube over pin-fin tube as significant increase in retention angle was observed for integral-fin tube ((having same longitudinal spacing, tooth thickness, tooth height, inner and outer diameter) while retention angle for pin-fin tubes remain unchanged. Optimum ethanol concentration was observed to be 0.75%.

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Tan, Huanshu, Christian Diddens, Pengyu Lv, J. G. M. Kuerten, Xuehua Zhang i Detlef Lohse. "Evaporation-triggered microdroplet nucleation and the four life phases of an evaporating Ouzo drop". Proceedings of the National Academy of Sciences 113, nr 31 (14.07.2016): 8642–47. http://dx.doi.org/10.1073/pnas.1602260113.

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Evaporating liquid droplets are omnipresent in nature and technology, such as in inkjet printing, coating, deposition of materials, medical diagnostics, agriculture, the food industry, cosmetics, or spills of liquids. Whereas the evaporation of pure liquids, liquids with dispersed particles, or even liquid mixtures has intensively been studied over the past two decades, the evaporation of ternary mixtures of liquids with different volatilities and mutual solubilities has not yet been explored. Here we show that the evaporation of such ternary mixtures can trigger a phase transition and the nucleation of microdroplets of one of the components of the mixture. As a model system, we pick a sessile Ouzo droplet (as known from daily life—a transparent mixture of water, ethanol, and anise oil) and reveal and theoretically explain its four life phases: In phase I, the spherical cap-shaped droplet remains transparent while the more volatile ethanol is evaporating, preferentially at the rim of the drop because of the singularity there. This leads to a local ethanol concentration reduction and correspondingly to oil droplet nucleation there. This is the beginning of phase II, in which oil microdroplets quickly nucleate in the whole drop, leading to its milky color that typifies the so-called “Ouzo effect.” Once all ethanol has evaporated, the drop, which now has a characteristic nonspherical cap shape, has become clear again, with a water drop sitting on an oil ring (phase III), finalizing the phase inversion. Finally, in phase IV, all water has evaporated, leaving behind a tiny spherical cap-shaped oil drop.

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