Extractive distillation of methylal/methanol mixture using ethylene glycol as entrainer

被引：51

作者：

Dong, Yichun ^{[1
]}

Dai, Chengna ^{[1
]}

Lei, Zhigang ^{[1
]}

机构：

[1] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Energy Environm Catalysis, Box 266, Beijing 100029, Peoples R China

来源：

FLUID PHASE EQUILIBRIA | 2018年 / 462卷

基金：

中国国家自然科学基金;

关键词：

Methylal; Methanol; Ethylene glycol; Extractive distillation; UNIFAC model; COSMO-RS model; ANHYDROUS ETHANOL-PRODUCTION; COSMO-RS; IONIC LIQUIDS; VAPOR-LIQUID; PHASE-EQUILIBRIUM; SCREENING MODEL; REAL SOLVENTS; PLUS WATER; SEPARATION; METHYLAL;

D O I：

10.1016/j.fluid.2018.01.038

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Ethylene glycol (EG) is proposed as an entrainer for the separation of methylal and methanol by extractive distillation. The COSMO-RS model was used to screen the suitable entrainer in terms of selectivity and solvent capacity. EG is a suitable entrainer with a low environmental impact. Vapor-liquid equilibrium (VLE) experiments demonstrated that the relative volatility of methylal to methanol is significantly improved using EG as an entrainer. The new corresponding interaction parameters were obtained by correlating the VLE data using the UNIFAC model, and then they were introduced into the process simulation software. The extractive distillation process was simulated using the rigorous equilibrium stage model. The optimal operating conditions were obtained by sensitivity analysis. The simulation results showed that EG is effective and efficient for the separation of methylal and methanol. In addition, the COSMO-RS model provides some theoretical insights into the separation mechanism. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：172 / 180

页数：9

共 45 条

[1] Vapor-liquid and liquid-liquid equilibria in binary and ternary mixtures of water, methanol, and methylal [J].