文献类型：期刊文献

英文题名：Separation of Ethylene Glycol, 1,2-Butanediol and 1,2-Propanediol with Azeotropic Distillation

作者：Zhou, Jinghong[1]; Wang, Jia[1]; Shen, Rongchun[2]; Cao, Yueqiang[1]; Li, Wei[2]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220111642)

语种：英文

外文关键词：Binary mixtures - Computer software - Distillation - Ethylene glycol - Liquids - Phase equilibria - Polyols - Recovery

摘要：1,2-butanediol (1,2-BDO) and 1,2-propanediol (1,2-PDO) are inevitably side produced in the ethylene glycol (EG) production processes from non-petroleum routes, but very difficult to separate by ordinary distillation method because of the closeness of their boiling temperatures to EG, thus compromise the economy of these processes. The azeotropic distillation process using 1-octanol (CPO) as an entrainer to separate EG and 1,2-BDO with or without 1,2-PDO was studied in this paper. Four binary vapor-liquid equilibrium data of EG-1,2-BDO, EG-CPO, 1,2-BDO-CPO and 1,2-PDO-CPO were measured using an Ellis equilibrium kettle and regressed with NRTL thermodynamic model to obtain the corresponding binary interaction parameters. On this basis, azeotropic distillations with CPO as an entrainer were designed to separate EG and 1,2-BDO with or without 1,2-PDO. The complete separation processes, including CPO recovery process consisting of extraction with H2O and subsequent distillation, were simulated and optimized with Aspen Plus for both EG-1,2-BDO binary mixture and EG-1,2-BDO-1,2-PDO ternary mixture. The simulation results show that the azeotropic distillation method with CPO as an entrainer can effectively separate the mixture of EG-1,2-BDO and EG-1,2-BDO-1,2-PDO, achieving EG of 99.9% purity with 99.9% recovery and 1,2-BDO of 99.1% purity with 99.2% recovery for the binary mixture, and achieving EG of 99.9% purity with 99.8% recovery, 1,2-BDO of 99.3% purity with 99.4% recovery and 1,2-PDO of 90.6% purity with 94.4% recovery for the ternary mixture. These processes are promising for industrial application and can significantly improve the economy of non-petroleum EG production. ? 2022, The Authors. All rights reserved.