变压精馏分离1,2-二氯乙烷和正庚烷共沸物  

Separation of 1,2-dichloroethane-n-heptane azeotrope by pressure swing distillation

作　　者：汪广恒[1] 赵泽高 李建伟[1] WANG Guang-heng;ZHAO Ze-gao;LI Jian-wei(College of Chemical and Chemical Engineering,Xi′an University of Science and Technology,Xi′an 710054,Shaanxi Province,China)

机构地区：[1]西安科技大学化工学院,陕西西安710054

出　　处：《化学工程》2021年第10期32-36,共5页Chemical Engineering(China)

基　　金：国土资源部煤炭资源勘查与综合利用重点实验室开放课题基金资助项目(6000190377)。

摘　　要：采用UNIQUAC活度系数模型关联文献报道的1,2-二氯乙烷(DCE)和正庚烷(HEP)体系气液相平衡数据,得到了二元交互作用参数。通过热力学分析,确定了DCE-HEP体系常压-负压变压精馏工艺。以年度总费用(TAC)为评价指标,基于AspenPlus的灵敏度分析结果,优化了2塔操作压力、理论板数、进料位置和回流比。结果表明:TAC随着负压塔操作压力降低而降低,精馏塔塔顶组成越接近共沸组成TAC越高,2塔回流比存在最优组合。Using UNIQUAC activity coefficient model,reported vapor-liquid equilibria data of 1,2-dichloroethane(DCE)and n-heptane(HEP)systems was correlated,and the binary parameters were obtained.Through thermodynamic analysis,an atmospheric-negative-pressure swing distillation process for the DCE-HEP system was determined.According to sensitivity analysis results of AspenPlus,the operating pressure,theoretical stage number,feed location and reflux ratio of the two columns were optimized based on the total annual cost(TAC).The results show that TAC decreases with the decrease of operating pressure of the negative pressure tower,and increases as the distillate composition gets closer to azeotrope.The reflux ratios of the two columns have an optimal combination.

关 键 词：1 2-二氯乙烷 正庚烷 共沸物 年度总费用 变压精馏 

分 类 号：TQ028.3[化学工程]