Vapor–Liquid Equilibria for 2-Propanol Dehydration through Extractive Distillation Using Mixed Solvent of Ethylene Glycol and Choline Chloride,Journal of Chemical & Engineering Data

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Vapor–Liquid Equilibria for 2-Propanol Dehydration through Extractive Distillation Using Mixed Solvent of Ethylene Glycol and Choline Chloride
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2018-06-18 , DOI: 10.1021/acs.jced.8b00162
Lianzhong Zhang ₁ , Mingyang Lan ₁ , Xuejiao Wu ₁ , Yichi Zhang ₁

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The mixed solvent of ethylene glycol (EG) and choline chloride (ChCl) was tested as an entrainer for 2-propanol dehydration by extractive distillation. Isobaric vapor–liquid equilibrium (VLE) data were measured at 101.3 kPa for the quaternary system water + 2-propanol + EG + ChCl. The NRTL equation was used for the modeling of the quaternary VLE. Mean absolute deviations were 0.26 K and 0.0036 for equilibrium temperature and vapor mole fraction of 2-propanol, respectively. As compared with EG alone, the existence of ChCl in the solvent significantly decreases the activity coefficient of water and increases the activity coefficient of 2-propanol, both enhancing the relative volatility of 2-propanol to water. The azeotrope of water +2-propanol can be removed with the addition of the deep eutectic mixture EG + ChCl 2:1 at a solvent mass fraction of 0.157. The mixed solvent may be readily applied in extractive distillation of 2-propanol and water, replacing the frequently used mixed solvent of ethylene glycol and potassium acetate.

中文翻译：

使用乙二醇和氯化胆碱的混合溶剂通过萃取蒸馏进行2-丙醇脱水的汽液平衡

测试了乙二醇（EG）和氯化胆碱（ChCl）的混合溶剂作为通过萃取蒸馏进行2-丙醇脱水的夹带剂。对于四元系统水+ 2-丙醇+ EG + ChCl，在101.3 kPa下测量了等压气液平衡（VLE）数据。NRTL方程用于四元VLE的建模。2-丙醇的平衡温度和蒸气摩尔分数的平均绝对偏差分别为0.26 K和0.0036。与单独的EG相比，溶剂中ChCl的存在显着降低了水的活度系数并增加了2-丙醇的活度系数，均增强了2-丙醇对水的相对挥发性。可以通过添加溶剂质量分数为0的深共晶混合物EG + ChCl 2：1除去水+ 2-丙醇的共沸物。

更新日期：2018-06-18

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