苯-环己烯-环己烷物系的萃取精馏工艺模拟及优化  

Simulation and optimization of extractive distillation process of benzene-cyclohexene-cyclohexane system

作　　者：佟瑞鑫 米万良[1] 乐恺[1] 陆平[2] 白芳[2] 华超[2] 

机构地区：[1]北京科技大学机械工程学院,北京100183 [2]中国科学院过程工程研究所绿色过程与工程重点实验室,北京100190

出　　处：《天然气化工—C1化学与化工》2013年第6期54-58,共5页Natural Gas Chemical Industry

摘　　要：为了优化操作参数,利用Aspen plus的NRTL热力学模型对以N,N-二甲基乙酰胺为萃取剂的苯-环己烯-环己烷三元物系的萃取精馏分离工艺进行了模拟。确定了第一萃取精馏塔的最佳工艺条件,当此塔采用36块理论板数,原料进料位置在第12块理论板处,溶剂进料位置在第5块理论板处,回流比为2.33,溶剂比为3.2,溶剂进料温度为65℃时,全塔满足分离工艺要求,塔釜产物环己烯和环己烷的总质量分数小于0.01%,塔釜苯的质量回收率大于99.9%,塔顶产物苯的质量分数小于0.01%,并且能耗得到降低。To optimize operation conditions, the NRTL thermodynamic model in Aspen Plus was used to sinmlate the extractive distillation process of benzene （BZ）-cyclohexene （HE）-cyclohexane （HA） system with N,N-dimethyl acetamide as extractant. The optimum operation parameters for the first extractive distillation column were determined as follows： theoretical stage number of 36, feedstock feeding at stage 12, solvent feeding at stage 5, reflux ratio of 2.33, solvent/feedstock mass ratio of 3.2 and solvent inlet temperature of 65℃. Under above optimized conditions, the requirement for industrial separation of BZ-HE-HA could be satisfied the total mass fraction of HE and HA in the column bottom product is lower than 0.01%, the recovery rate of BZ is over 99.9% and the mass fraction of BZ in the column top product is below 0.01%, and the enerzv consumption could be reduced.

关 键 词：萃取精馏 苯 环己烯 环己烷 模拟 

分 类 号：TQ028.3[化学工程]