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Zi Hao Wang - One of the best experts on this subject based on the ideXlab platform.
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measurement and prediction of vapor pressure of binary and ternary systems containing 1 ethyl 3 methylimidazolium ethyl sulfate
Journal of Chemical & Engineering Data, 2007Co-Authors: Junfeng Wang, Zi Hao WangAbstract:Vapor pressure data were measured for water, methanol, and ethanol as well as their binary mixtures in the presence of the ionic liquid (IL) 1-ethyl-3-methylimidazolium ethyl sulfate ([EMIM][ES]) at different temperatures and IL-content ranging from mass fraction of (0.10 to 0.70) using a quasi-static ebulliometer method. The vapor pressure data of the IL-containing binary systems were correlated by the NRTL equation with an average absolute Relative deviation (ARD) within 0.0068. The binary NRTL parameter was used for the prediction of vapor pressure of ternary systems with fair accuracy. Furthermore, the isobaric vapor−liquid equilibrium data for water + ethanol and methanol + ethanol binary mixtures at 101.3 kPa and mass fraction of [EMIM][ES] of 0.5 were predicted. It is shown that the Relative Volatility of ethanol in both binaries is enhanced and that the azeotrope of the water + ethanol mixture was eliminated completely since the interaction energy between different solvents and IL follows the orde...
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measurement and prediction of vapor pressure of binary and ternary systems containing 1 ethyl 3 methylimidazolium ethyl sulfate
Journal of Chemical & Engineering Data, 2007Co-Authors: Junfeng Wang, Zi Hao WangAbstract:Vapor pressure data were measured for water, methanol, and ethanol as well as their binary mixtures in the presence of the ionic liquid (IL) 1-ethyl-3-methylimidazolium ethyl sulfate ([EMIM][ES]) at different temperatures and IL-content ranging from mass fraction of (0.10 to 0.70) using a quasi-static ebulliometer method. The vapor pressure data of the IL-containing binary systems were correlated by the NRTL equation with an average absolute Relative deviation (ARD) within 0.0068. The binary NRTL parameter was used for the prediction of vapor pressure of ternary systems with fair accuracy. Furthermore, the isobaric vapor−liquid equilibrium data for water + ethanol and methanol + ethanol binary mixtures at 101.3 kPa and mass fraction of [EMIM][ES] of 0.5 were predicted. It is shown that the Relative Volatility of ethanol in both binaries is enhanced and that the azeotrope of the water + ethanol mixture was eliminated completely since the interaction energy between different solvents and IL follows the orde...
Fengying Xing - One of the best experts on this subject based on the ideXlab platform.
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isobaric vapor liquid equilibrium for ethyl acetate ethanol 1 ethyl 3 methylimidazolium tetrafluoroborate
Journal of Chemical & Engineering Data, 2009Co-Authors: Jiguo Zhang, Zhigang Lei, Jiujuan Zhu, Fengying XingAbstract:Isobaric vapor−liquid equilibrium (VLE) data for ethyl acetate (1) + ethanol (2) containing ionic liquid (IL) 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]+[BF4]−) (3) at atmospheric pressure (101.32 kPa) were measured with a modified Othmer still. It was observed that the VLE data containing the IL were obviously different from that of the IL-free system. The IL investigated showed a notable salting-out effect, which enhanced the Relative Volatility of ethyl acetate to ethanol and gave rise to the elimination of the azeotropic point at a specific IL mole fraction. It was found that the salting-out effect followed the order of x3 = 0.30 > x3 = 0.20 > x3 = 0.07. The measured ternary data were correlated using the NRTL model.
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isobaric vapor liquid equilibrium for isopropanol water 1 ethyl 3 methylimidazolium tetrafluoroborate
Journal of Chemical & Engineering Data, 2008Co-Authors: Fengying Xing, Zhigang Lei, Baohua Wang, Qiulian ChangAbstract:Isobaric vapor–liquid equilibrium (VLE) data for the isopropanol (1) + water (2) system containing ionic liquid (IL) 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]+[BF4]−) at atmospheric pressure (101.32 kPa) were measured with a modified Othmer still. The results showed that the VLE of isopropanol + water in the presence of different contents of IL was obviously different from that of the IL-free system. The IL studied showed a salting-out effect, which gave rise to a change of the Relative Volatility of isopropanol and even to the elimination of the azeotropic point. It was found that the salting-out effect followed the order of x3′ = 0.30 > x3′ = 0.20 > x3′ = 0.10, which was probably attributed to the interaction between the ions resulting from the dissociation of IL and water.
Xin Gao - One of the best experts on this subject based on the ideXlab platform.
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predicting microwave induced Relative Volatility changes in binary mixtures using a novel dimensionless number
Chemical Engineering Science, 2021Co-Authors: Zhenyu Zhao, Guanlun Sun, Xinhui Tang, Xin GaoAbstract:Abstract Microwave (MW) irradiation is known to selectively interact with polar molecules in a homogeneously mixed liquid solution and change their Relative volatilities; this phenomenon has been observed experimentally in various binary mixtures. However, the lack of theoretical analysis and quantitative modeling hinders the further development of novel MW-assisted separation techniques. A novel dimensionless number ZMW was derived in the present study based on an assumption involving molecular radiators to explore the effect of dielectric and thermodynamic properties of the materials as well as the MW field intensity on the microwave-induced Relative Volatility change (MIRVC). Moreover, a quantitative correlation was established between MIRVC and ZMW, whose model parameters were determined by fitting experimental data obtained from mixtures under MW irradiation. The correlation was also employed to predict MIRVC in data obtained from previous studies. The error range between the predicted and experimental values was within ±6%, indicating the validity of the proposed quantitative correlation.
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predicting microwave induced Relative Volatility change by a novel dimensionless number
Authorea Preprints, 2020Co-Authors: Zhenyu Zhao, Guanlun Sun, Xinhui Tang, Xin GaoAbstract:Microwave (MW) can selectively interact with polar molecules in homogeneous mixture liquid solution and therefore change their Relative Volatility, which has been previously observed in experimental results for various binary mixtures. However, the lack of theoretical analysis and quantitative modeling hinders the further development of novel MW-assisted separation techniques. Hence, this study derived a novel dimensionless number ZMW based on the assumption of molecular irradiation to explore the effect of the dielectric and thermodynamic properties of materials as well as MW field intensity on the microwave-induced Relative Volatility change (MIRVC). Furthermore, a quantitative correlation between MIRVC and ZMW was established, whose model parameters were determined by fitting experimental data under MW irradiation. The correlation was also utilized to predict MIRVC in the previously published literature and the error range between predictive values and experimental values was within ± 6%, indicating great validity of the proposed quantitative correlation.
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understanding the influence of microwave on the Relative Volatility used in the pyrolysis of indonesia oil sands
Chinese Journal of Chemical Engineering, 2018Co-Authors: Peng Shi, Xin Gao, Xiaolei FanAbstract:Abstract In this paper, pyrolysis of Indonesian oil sands (IOS) was investigated by two different heating methods to develop a better understanding of the microwave-assisted pyrolysis. Thermogravimetric analysis was conducted to study the thermal decomposition behaviors of IOS, showing that 550 °C might be the pyrolysis final temperature. A explanation of the heat–mass transfer process was presented to demonstrate the influence of microwave-assisted pyrolysis on the liquid product distribution. The heat–mass transfer model was also useful to explain the increase of liquid product yield and heavy component content at the same heating rate by two different heating methods. Experiments were carried out using a fixed bed reactor with and without the microwave irradiation. The results showed that liquid product yield was increased during microwave induced pyrolysis, while the formation of gas and solid residue was reduced in comparison with the conventional pyrolysis. Moreover, the liquid product characterization by elemental analysis and GC–MS indicated the significant effect on the liquid chemical composition by microwave irradiation. High polarity substances (e > 10 at 25 °C), such as oxy-organics were increased, while Relatively low polarity substances (e
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reversible reaction assisted intensification process for separating the azeotropic mixture of ethanediol and 1 2 butanediol reactants screening
Industrial & Engineering Chemistry Research, 2018Co-Authors: Rui Wang, Xin GaoAbstract:The feasibility of employing reversible reactions to convert the separation of ethanediol (EG) and 1,2-butanediol (1, 2-BDO) azeotropic system was analyzed in our previous work. This article aims at systematically screening the feasible reactants for the reaction-assisted separation process. A screening principle was brought up and applied. Through preliminary screening, acetic acid, acrylic acid, acetaldehyde, propionaldehyde, propanol and butanone were obtained as potential reactants. Propionaldehyde was chosen as the proper one after fully comparing the reaction selectivity difference and conversion of EG and 1,2-BDO in reaction process, the separation efficiency in purification process as well as final EG yield. The separation efficiency was predicted based on the Relative Volatility of EG, 1,2-BDO and their corresponding products and was verified by distillation experiments. The stratification appeared in the reaction was found beneficial to the coupling of reaction and separation.
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Reversible Reaction-Assisted Intensification Process for Separating the Azeotropic Mixture of Ethanediol and 1,2-Butanediol: Reactants Screening
2017Co-Authors: Rui Wang, Xin GaoAbstract:The feasibility of employing reversible reactions to convert the separation of ethanediol (EG) and 1,2-butanediol (1,2-BDO) azeotropic system was analyzed in our previous work. This article aims at systematically screening the feasible reactants for the reaction-assisted separation process. A screening principle was brought up and applied. Through preliminary screening, acetic acid, acrylic acid, acetaldehyde, propionaldehyde, propanol, and butanone were obtained as potential reactants. Propionaldehyde was chosen as the proper one after fully comparing the reaction selectivity difference and conversion of EG and 1,2-BDO in the reaction process, the separation efficiency in the purification process, and final EG yield. The separation efficiency was predicted based on the Relative Volatility of EG, 1,2-BDO, and their corresponding products and was verified by distillation experiments. The stratification appeared in the reaction was found beneficial to the coupling of reaction and separation
Honglai Liu - One of the best experts on this subject based on the ideXlab platform.
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experimental determination of vapor liquid equilibrium for methanol methyl propionate 1 butyl 3 methylimidazo lium bis trifluoromethylsulfonyl imide at atmospheric pressure
The Journal of Chemical Thermodynamics, 2019Co-Authors: Changjun Peng, Honglai LiuAbstract:Abstract Ionic liquid (IL) was selected as extractive distillation entrainer to separate the binary mixture of methanol and methyl propionate with the lowest azotropic temperature. Experimental determination of isobaric vapor-liquid equilibrium for the system of methanol + methyl propionate + 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf2]) was made at atmospheric pressure with an all-glass dynamic recirculating still. The results show that the addition of [BMIM][NTf2] can produce an obvious salting-out effect and well enhances the Relative Volatility of methanol to methyl propionate, and the azeotropy of the investigated binary system is ultimately eliminated by increasing the concentration of IL to a certain value in liquid phase. Additionally, the experimental data were well fitted with the NRTL model and the binary parameters were obtained.
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Optimization of pre-concentration, entrainer recycle and pressure selection for the extractive distillation of acetonitrile-water with ethylene glycol
Chemical Engineering Science, 2018Co-Authors: Xinqiang You, Vincent Gerbaud, Changiun Peng, Honglai LiuAbstract:We optimize the extractive distillation process for separating the acetonitrile – water azeotropic mixture with ethylene glycol by using a multi-objective genetic algorithm for minimizing under purity constraints the total cost, the energy consumption and the separation efficiency. For the first time we have shown the interest of five aspects by considering them simultaneously 1) the pre-concentration column has been included and 2) there is no need to set a distillate composition constraint (like being at the azeotropic composition) in the pre-concentration column. 3) The operating pressure should be lower than 1 atm because it enhances the Relative Volatility for 1.0-1a class system. 4) A closed loop optimization must be run, to handle the effect of impurity in the entrainer recycle since too much impurity limits the main product recovery and purity from the extractive column. 5) All three columns process must be optimized together rather than sequentially and with multiple objectives. The studied system belongs to class 1.0-1a and the impurity of the recycled entrainer has strong effect on the purity of acetonitrile product. Overall, 17 variables are optimized; column trays, all feed locations, refluxes, entrainer flow rate and all distillate products; under purity constraints for the acetonitrile and water product and for the entrainer recycle impurity. Among nearly 400 designs satisfying the purity specifications, the design case 3 shows an energy consumption and TAC reduced by more than 20% than a literature reference case, thanks to smaller entrainer flow rate, a reduction of 32 trays and lower operating pressures. The best design is a trade-off between first a feasibility governed by thermodynamics through composition profiles and Relative Volatility maps and second process cost and energy demands.
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amino acid based ionic liquids as additives for the separation of an acetonitrile and water azeotropic mixture cosmo rs prediction and experimental verification
Industrial & Engineering Chemistry Research, 2015Co-Authors: Qing Yang, Hairong Ding, Changjun Peng, Honglai LiuAbstract:The effects of 18 different amino acid based ionic liquids (AAILs) on the phase behavior of an acetonitrile + water mixture were predicted through the COSMO-RS method, indicating that all investigated AAILs could enhance the Relative Volatility of acetonitrile and break the azeotrope, in which 1-ethyl-3-methylimidazolium proline ([EMIM][Pro]) was the most effective at a given condition. Furthermore, the properties of the interaction energy, charge-density profiles, and excess enthalpy were obtained, showing that the stronger interactions between AAIL and water lead to improvement of the separation efficiency. To verify the feasibility, the isobaric vapor–liquid equilibrium data for two ternary mixtures of acetonitrile + water + [EMIM][Pro] and + 1-ethyl-3-methylimidazolium acetate ([EMIM][OAC]) at fixed IL mole fraction (0.05 and 0.10) were measured at atmospheric pressure. The experimental results show that the two ILs can effectively enhance the Relative Volatility of acetonitrile and break the azeotrop...
Zhigang Zhang - One of the best experts on this subject based on the ideXlab platform.
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separation of methanol dimethyl carbonate azeotropic mixture using ionic liquids as entrainers
Fluid Phase Equilibria, 2017Co-Authors: Zhigang Zhang, Qinqin Zhang, Aidi ZhangAbstract:Abstract Isobaric vapor-liquid equilibrium (VLE) data of methanol + dimethyl carbonate, methanol + dimethyl carbonate + 1-Ethyl-3-Methylimidazolium Bromide ([EMIM][Br]) and methanol + dimethyl carbonate + 1-Butyl-3-Methylimidazolium Chloride ([BMIM][Cl]) were measured by a modified Othmer still at 101.3 kPa. The two investigated ionic liquids produced significant effects on the separation of the methanol and dimethyl carbonate azeotropic system. The Relative Volatility of dimethyl carbonate to methanol was enhanced with the addition of ionic liquid. The two ionic liquids could both eliminate the azeotropic point as their concentration increased to a certain value, but [BMIM][Cl] showed a greater separation effect on methanol and dimethyl carbonate azeotropic system than [EMIM][Br]. Furthermore, the measured data were well correlated with the nonrandom two-liquid (NRTL) model.
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separation of methyl acetate methanol azeotropic mixture using ionic liquids as entrainers
Fluid Phase Equilibria, 2015Co-Authors: Zhigang Zhang, Tao Zhang, Qinqin Zhang, Mingyao Sun, Dezhang SunAbstract:Abstract Three ionic liquids (ILs), namely 1-butyl-3-methylimidazolium chloride ([C4MIM][Cl]), 1-(2-chloroethyl)-3-methylimidazolium chloride ([ClC2MIM][Cl]) and 1-butyl-3-methylimidazolium bromide ([C4MIM][Br]), were investigated as entrainers for the separation of azeotropic mixture of methyl acetate and methanol. Isobaric vapor–liquid equilibrium (VLE) data for the ternary systems containing ILs were measured in a recirculating still at 101.3 kPa. It was found that all the three ILs produced a salting-out effect on methyl acetate, thus enhancing the Relative Volatility of methyl acetate to methanol. The salting-out effect of the ILs employed in this study follows the order: [C4MIM][Cl] > [ClC2MIM][Cl] > [C4MIM][Br]. Moreover, [C4MIM][Cl] could eliminate the azeotropic point at a mole fraction of 0.134. The experimental data were well correlated with the nonrandom two-liquid (NRTL) model.
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entrainer selection for separating tetrahydrofuran water azeotropic mixture by extractive distillation
Separation and Purification Technology, 2014Co-Authors: Zhigang Zhang, Donghao Huang, Peng Jia, Dezhang SunAbstract:Abstract The mixture of tetrahydrofuran (THF) and water is a minimum boiling azeotrope due to the strong hydrogen bond effect. Some entrainers with different molecular structures which can potentially disrupt hydrogen bonds have been used to improve the Relative Volatility of THF–water system. After cautiously screening, we find that dimethyl sulfoxide (DMSO) as a hydrogen bond breaker is more effective to break the azeotrope than 1, 2-propanediol proposed by Songlin Xu etc. To validate our viewpoint, the vapor–liquid equilibrium (VLE) data of the two ternary systems: THF (1) + water (2) + 1, 2-propanediol (3) and THF (1) + water (2) + DMSO (3) were measured at 101.32 kPa. And these data are also valuable for the design of extractive distillation process. The nonrandom two-liquid (NRTL) model was applied to correlate the binary and ternary VLE data.