摘要
基于NRTL模型,以乙二醇为萃取剂,用Aspen Plus软件对二氯甲烷-乙醇-水三元体系间歇萃取精馏过程进行模拟,分别考虑了溶剂比、回流比、塔板数、溶剂进料位置和溶剂进料温度对整个精馏过程的影响.原料为100 kg含95%二氯甲烷(质量分数)、3%水、2%乙醇的混合溶液.利用模拟结果对各工艺参数进行分析和优化,得出了最佳的操作条件:精馏塔塔板数为20块、溶剂进料位置在第2块塔板、溶剂进料温度为38℃、回流比为2.5、溶剂比为0.575.在该操作条件下,塔顶的二氯甲烷的质量分数可达99.8%以上,回收率为96.65%,满足溶剂回收再利用的要求.通过实验对该模拟结果进行验证,得到的二氯甲烷质量分数高达99.8%,回收率为90%左右,与模拟结果基本一致.
Using glycol as extraction agent, based on the non-random two-liquid （NRTL） model, Aspen Plus software is employed to simulate the batch extractive distillation process of dichlo- romethane-ethanol-water. The feed is 100 kg aqueous solution of dichloromethane-water-ethanol （mass ratio is 95： 3： 2）. Taking solvent ratio, reflux ratio, number of plates, solvent feeding position and solvent feeding temperature into consideration, the optimum operating conditions are obtained： The number of tower plates is 20 ; the solvent feeding position is the second tower plate; the solvent feed- ing temperature is 38 ~C ; the reflux ratio is 2.5 ; the solvent ratio is 0. 575. Under these circum- stances, the overhead fraction of dichloromethane is up to 99.8% and the recycling rate is up to 96.65 %, fulfilling the requests of recycle. To verify the simulation results, the experiment is carried out. The mass fraction of dichloromethane is up to 99.8% and the recycling rate is about 90%, which are basically the same as the simulation results.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第3期511-515,共5页
Journal of Southeast University：Natural Science Edition
