离子液体反应萃取精馏合成乙酸乙酯

doi:10.11949/j.issn.0438-1157.20151227

摘要/Abstract

摘要：

采用离子液体1-磺酸丁基-3-甲基咪唑硫酸氢盐([HSO₃bmim][HSO₄])和1-丁基-3-甲基咪唑双三氟甲磺酰亚胺盐([BMIM][Tf₂N])分别作为催化剂和萃取剂,对乙酸甲酯与乙醇合成乙酸乙酯和甲醇的反应萃取精馏(RED)过程进行了模拟计算。在反应动力学和汽液相平衡分析基础上建立了反应萃取精馏流程,研究了理论板数、回流比、持液量、进料位置、溶剂比(萃取剂进料与原料进料摩尔流量的比值)、催化剂进料流量等参数对反应萃取精馏过程的影响。在优化的操作条件下,甲醇纯度为0.9922,乙酸乙酯纯度为0.9905,乙酸甲酯转化率为0.9922。

关键词: 离子液体, 反应萃取精馏, 乙酸甲酯, 甲醇, 共沸物, 模拟

Abstract:

Transesterification of methyl acetate with ethanol to produce ethyl acetate and methanol via reactive and extractive distillation (RED) was simulated, using ionic liquids, 1-sulfobutyl-3-methyllimidazolium hydrogensulfate [HSO₃bmin][HSO₄] and 1-butyl-3-methylimidazolium bis[(trifluoromethyl) sulfonyl]imide ([BMIM][Tf₂N], as catalyst and entrainer respectively. Based on the analysis of vapor-liquid equilibrium and reaction kinetics, a reactive and extractive distillation process was developed. The effects of number of theoretical stages, reflux ratio, liquid holdup, feed locations, entrainer ratio (the ratio of solvent mole flowrate to feed mole flowrates) and catalyst flowrate on RED process were investigated. The simulation results indicated that the purities of ethanol and ethyl acetate were 0.9922 and 0.9905 (mole fraction), respectively, and the conversion of methyl acetate was 0.9922 under the optimal operating and structural conditions.

Key words: ionic liquids, reactive and extractive distillation, methyl acetate, methanol, azeotrope, simulation

中图分类号:

TQ032.4

揭会民, 崔现宝, 彭艳枚, 李晓兵, 徐丽, 林瑞榕. 离子液体反应萃取精馏合成乙酸乙酯[J]. 化工学报, 2016, 67(2): 606-613.

JIE Huimin, CUI Xianbao, PENG Yanmei, LI Xiaobing, XU Li, LIN Ruirong. Synthesis of ethyl acetate via reactive and extractive distillation column using ionic liquids as catalyst and entrainer[J]. CIESC Journal, 2016, 67(2): 606-613.

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