Effect of ionic liquids on (vapor+liquid) equilibrium behavior of (water+2-methyl-2-propanol)

Zhang, Lianzhong; Qiao, Bingbang; Ge, Yun; Deng, Dongshun; Ji, Jianbing

doi:10.1016/j.jct.2008.07.004

Cited by 34 publications

(31 citation statements)

References 11 publications

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“…Most of the studies were performed using 1-alkyl-3-methylimidazolium based ILs, the anions of which are carboxylate or halide. Zhang et al 15 Cl. These ILs were also used as entrainers to separate the methyl alcohol + water and ethyl alcohol + water azeotropic systems.…”

Section: ■ Introductionmentioning

confidence: 99%

Isobaric Vapor–Liquid Equilibrium of tert-Butyl Alcohol + Water + Triethanolamine-Based Ionic Liquid Ternary Systems at 101.3 kPa

Zhang

et al. 2015

J. Chem. Eng. Data

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Isobaric vapor−liquid equilibrium (VLE) data for the tert-butyl alcohol (t-BuOH) + water + triethanolamine (TEA), t-BuOH + water + triethanolamine formic acid ([TEA][Fc]), t-BuOH + water + triethanolamine acetic acid ([TEA][Ac]), and t-BuOH + water + triethanolamine lactic acid ([TEA][Lc]) ternary systems were measured at 101.3 kPa. The results indicated that all the three ILs produced a more obvious effect on the VLE behavior of t-BuOH + water system than TEA, and eliminated the azeotropic point in the whole concentration range. [TEA][Lc] was the best solvent for the separation of the t-BuOH + water system by extractive distillation among the three ILs investigated. The experimental VLE data for the ternary systems were correlated with the NRTL model equation, and good correlations were obtained with an average relative deviation of 2.4 %. ■ INTRODUCTIONExtractive distillation is a widely used way to separate azeotropic or close-boiling mixtures like alcohol + water. 1,2 For this method, the key is to select an effictive solvent (entrainer) to break the azeotrope. Organic solvents and solid salts are commonly used entrainers, but encounter many problems in use such as solvent loss, difficulty in recycling, and equipment blocking. 3,4 Ionic liquids (ILs) are a new class of compounds that are entirely composed of ions. Because of their ignorable vapor pressure, good chemical and thermal stability, and other designable physical−chemical properties, ILs instead of traditional organic solvents and solid salts have been increasingly employed as entrainers for separating azeotropes in recent years. 5−14 tert-Butyl alcohol (t-BuOH) is an important solvent in the chemical and medicine industry. A mixture of t-BuOH and water is often used for the production of pharmaceutical products by freeze-drying. The t-BuOH + water mixture presents a minimum boiling azetrope at 353.06 K at atmospheric pressure. Thus, it is impossible to separate this mixture by simple distillation. Extractive distillation is widely adopted to separate this mixture. The traditional solvent (entrainer) is ethylene glycol, which suffers the disadvantages of solvent loss and poor efficiency. ILs have been employed as new solvents to separate this azetrope in recent years. Most of the studies were performed using 1-alkyl-3-methylimidazolium based ILs, the anions of which are carboxylate or halide. Zhang et al. 15 studied the relative volatility of t-BuOH to water effected by the ILs composed of an anion chosen from [OAc] − or [Cl] − , and a cation from 1-ethyl-3-methylimidazolium ([EMIM] + ), or 1-butyl-3-methylimidazolium ([BMIM] + ), or 1-hexyl-3-methylimidazolium ([HMIM] + ), at a fixed t-BuOH mole fraction of 0.95. The effect of ILs on enhancement of the relative volatility list as [EMIM]Cl > [EMIM]OAc > [BMIM]Cl > [BMIM]OAc > [HMIM]OAc > [HMIM]Cl. These ILs were also used as entrainers to separate the methyl alcohol + water and ethyl alcohol + water azeotropic systems. 16−18 However, there is a paucity of studies on other kinds of ILs, so it is neces...

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Section: ■ Introductionmentioning

confidence: 99%

Isobaric Vapor–Liquid Equilibrium of tert-Butyl Alcohol + Water + Triethanolamine-Based Ionic Liquid Ternary Systems at 101.3 kPa

Zhang

et al. 2015

J. Chem. Eng. Data

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“…This is desirable since the screening of solvents for extraction distillation, a thermal separation process, would benefit from activity coefficient values for ionic liquids at higher temperatures [45][46][47]. A comparison of the results in the study of Banerjee and Khanna with results obtained herein (through interpolation) reveals that the data obtained in this work and that obtained in theirs are not in good agreement.…”

Section: Resultsmentioning

confidence: 62%

Activity coefficients at infinite dilution of organic solutes in the ionic liquid trihexyl(tetradecyl)phosphonium tetrafluoroborate using gas–liquid chromatography at T=(313.15, 333.15, 353.15, and 373.15)K

Tumba

Reddy

Naidoo

et al. 2011

The Journal of Chemical Thermodynamics

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“…(2)[25]. The ratio of saturated vapor pressures, insensitive to temperature holding constant at 1.25 to 1.37 in the present work, and makes almost no difference to the relative volatility, thus α 12 mainly depends on the ratio of γ 1 /γ 2 .…”

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confidence: 55%

Separation of methyl acetate+methanol azeotropic mixture using ionic liquids as entrainers

Zhang

et al. 2015

Fluid Phase Equilibria

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Effect of ionic liquids on (vapor+liquid) equilibrium behavior of (water+2-methyl-2-propanol)

Cited by 34 publications

References 11 publications

Isobaric Vapor–Liquid Equilibrium of tert-Butyl Alcohol + Water + Triethanolamine-Based Ionic Liquid Ternary Systems at 101.3 kPa

Isobaric Vapor–Liquid Equilibrium of tert-Butyl Alcohol + Water + Triethanolamine-Based Ionic Liquid Ternary Systems at 101.3 kPa

Activity coefficients at infinite dilution of organic solutes in the ionic liquid trihexyl(tetradecyl)phosphonium tetrafluoroborate using gas–liquid chromatography at T=(313.15, 333.15, 353.15, and 373.15)K

Separation of methyl acetate+methanol azeotropic mixture using ionic liquids as entrainers

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