离子液体萃取精馏分离乙酸甲酯-甲醇共沸物  

Extractive Distillation of Methyl Acetate-Methanol Azeotrope with Ionic Liquid

作　　者：田征[1] 崔现宝[1] 彭艳枚[1] 薛乐星[1] 包振宇[1] 

机构地区：[1]天津大学化工学院化学工程联合国家重点实验室,天津300072

出　　处：《石油化工》2013年第5期537-541,共5页Petrochemical Technology

摘　　要：以离子液体1-乙基-3-甲基咪唑醋酸盐([EMIM][Ac])为萃取剂,对乙酸甲酯-甲醇共沸体系的萃取精馏过程进行了模拟。研究了原料进料位置、理论板数、萃取剂进料位置、回流比、溶剂比(萃取剂进料与原料进料摩尔流量的比值)等参数对萃取精馏过程的影响。模拟结果表明,乙酸甲酯的纯度随理论板数的增加先增加后趋于恒定,随萃取剂进料位置由塔顶向下移动而减小,原料进料位置、回流比和溶剂比存在最优值。利用模拟计算结果,获得了萃取精馏分离乙酸甲酯-甲醇共沸物的优化操作条件:理论板数27块,原料进料位置为第18块理论板,离子液体进料位置为第1块理论板,回流比为0.3,溶剂比为0.26。在此条件下,乙酸甲酯的纯度达到0.996 6。The extractive distillation with an ionic liquid, 1-ethyl-3-methylimidazolium acetate （EEMIMI EAc] ）, as the solvent for the separation of methyl acetate-methanol azeotrope was simulated. The effects of feed location, theoretical plate number, solvent feeding location, reflux ratio and solvent ratio（the ratio of solvent mole flowrate to feed mole flowrate） on the extractive distillation were investigated. The simulation results indicate that the purity of methyl acetate increases then tends to be stable with increasing the theoretical plate number and decreases with changing downward the solvent feeding location. The purity of methyl acetate is 0.996 6 under the optimal conditions of the theoretical plate number 27, feed location 184 plate, solvent feeding location 1^st plate, reflux ratio 0.3 and solvent ratio 0.26.

关 键 词：萃取精馏 乙酸甲酯 甲醇 共沸物 离子液体 CHEMCAD软件 

分 类 号：TQ028.31[化学工程]