甲苯-乙醇共沸体系分离的模拟计算  

Simulation Calculation of Separation of Toluene-Ethanol Azeotropic System

作　　者：邢跃军[1] 汪文睿[1] 景昆 郭峰[1] 李传峰[1] XING Yue-jun;WANG Wen-rui;JING Kun;GUO Feng;LI Chuan-feng(Nanjing Research Institute of Sinopec Yangzi Petrochemical Co.,Ltd.,Nanjing,Jiangsu 210048,China)

机构地区：[1]中国石化扬子石油化工有限公司南京研究院,江苏南京210048

出　　处：《浙江化工》2022年第6期35-40,共6页Zhejiang Chemical Industry

摘　　要：在Aspen Plus流程模拟软件中,采用NRTL物性方法,对甲苯-乙醇二元最低共沸物进行变压精馏工艺流程的模拟与优化。计算结果表明:由230 kPa高压塔和常压塔串联组成的双塔变压精馏工艺流程可以将甲苯-乙醇共沸物进行较好的分离,塔底所得甲苯和乙醇的质量分数均可达到99.9%。两塔的优化参数为:高压塔理论塔板数为30块,常压塔理论塔板数为35块,进料位置均在第23块板,回流比均为2.5。对变压精馏采用热集成的节能方法,再沸器可节能约39.7%,冷凝器节能约41.9%。The software Aspen Plus was used to simulate the pressure-swing distillation process of tolueneethanol azeotrope with NRTL property method.The results showed that the dual columns pressure-swing distillation process composed of 230 kPa high pressure column and atmospheric column can better separate the toluene-ethanol azeotrope,and all of the mass fraction of toluene and ethanol in the bottom of columns can reached 99.9%.The optimization parameters of the two columns were as follows:the numbers of theoretical stages of high-pressure column and atmospheric column were 30 and 35,all the feed-stream was above 23rd stage,and both the mass reflux ratio were 2.5.With the energy-saving plan of thermal integration was adopted for pressureswing distillation process,the reboilers can save 39.7%of energy,and the condensers saved energy by about41.9%.

关 键 词：甲苯 乙醇 共沸物 变压精馏 模拟计算 

分 类 号：TQ028.31[化学工程]