单(2-羟乙基)铵甲酸盐离子液体用于乙醇水溶液萃取精馏的过程模拟  

Process simulation for the extractive distillation of ethanol aqueous solution using 2-hydroxy ethylammonium formate as an ionic liquid extractive solvent

作　　者：李雪梅[1,2] 李春喜[1,2] 

机构地区：[1]化工资源有效利用国家重点实验室,北京100029 [2]北京化工大学化学工程学院,北京100029

出　　处：《现代化工》2012年第6期100-103,共4页Modern Chemical Industry

基　　金：国家自然科学基金(21076005);高等学校博士点专项科研基金(20090010110001)

摘　　要：利用Aspen Plus模拟软件,模拟研究了由乙醇质量分数为95%的工业酒精通过常压萃取精馏制取无水乙醇的工艺过程,并对单(2-羟乙基)铵甲酸盐离子液体和乙二醇传统萃取剂的分离性能进行了比较分析。考察了原料和萃取剂的进料位置、萃取剂用量、回流比等参数对分离效果的影响,获得了优化的操作条件,即精馏塔塔板数28,原料进料板为第17块,萃取剂进料板为第2块,溶剂比为0.6,摩尔回流比为1.6。在优化操作条件下,塔顶产品中乙醇的质量分数可达99.98%,与乙二醇为萃取剂的传统萃取精馏过程相比,再沸器热负荷降低28%,具有明显的节能效果。The extractive distillation process at atmospheric pressure for the production of anhydrous ethanol is simulated using Aspen Plus simulation software ,where the 95% （wt） industrial grade ethanol aqueous solution is used as feedstock, and 2-hydroxy ethylammonium formate is used as an ionic liquid extractive solvent. The separation performance of ionic liquid and conventional glycol solvent is compared and analyzed in terms of product purity and energy consumption. Effects of some operation parameters, viz. the feeding position of raw materials and extractive solvent, the mass ratio of solvent to feed, and reflux ratio, on the separation performance is investigated, and the optimum process condition is obtained as follows：theoretical plate number 28, feeding raw materials at plate 17 and extractive solvent at plate 2, the mass ratio of solvent to feed 0. 6, and mole reflux ratio 1.6. The results show that under the optimum conditions, the purity of the distillate, i. e. the mass fraction of ethanol, can reach 99.98%, meanwhile the heat duty of the reboiler using ionic liquid solvent decreases about 28% in comparison with the conventional glycol solvent, showing a promising energy saving effect.

关 键 词：单(2-羟乙基)铵甲酸盐 离子液体 萃取精馏 无水乙醇 ASPEN Plus 流程模拟 

分 类 号：TQ028[化学工程]