工业醋酸脱水过程五元体系非均相共沸精馏的流程模拟  

Process simulation of industrial acetic acid dehydration system via heterogeneous azeotropic distillation

作　　者：邢建良[1] 黄秀辉[2] 袁渭康[1] 

机构地区：[1]华东理工大学化工学院化学工程联合国家重点实验室,上海200237 [2]华东理工大学化工过程先进控制和优化技术教育部重点实验室,上海200237

出　　处：《化工学报》2012年第9期2681-2687,共7页CIESC Journal

基　　金：国家自然科学基金项目重点基金(U1162202);国家自然科学基金项目(61174118);国家高技术研究发展计划项目(2012AA040307);上海市基础研究重点项目(10JC1403400);高等学校学科创新引智计划项目(B08021)~~

摘　　要：针对以醋酸正丙酯为共沸剂的醋酸脱水过程,考虑醋酸溶剂中未反应的前体对二甲苯以及反应的副产物醋酸甲酯的影响及回收利用,分别选用HOC和UNIQUAC模型来修正体系中五元混合物系的汽液非理想性,通过拟合醋酸甲酯-对二甲苯和醋酸正丙酯-对二甲苯两体系的二元汽液平衡实验数据获得了该两组体系UNIQUAC模型的二元交互作用参数,借助模拟软件Aspen Plus,结合软件内置其他二元体系参数,对工业醋酸脱水塔系包括溶剂脱水塔、PX回收塔、共沸剂回收塔在内的三塔体系进行系统的分析模拟,得到了与工艺数据误差小于±6%的能正确描述工业醋酸脱水塔系操作特性的工艺机理稳态模型,为工业醋酸脱水过程工艺的进一步研究提供理论基础和依据。Considering the unreacted reactant p-xylene and by-product methyl acetate as feed impurities in the industrial acetic acid dehydration process using n-propyl acetate as entrainer,HOC and UNIQUAC models were chosen respectively to compute the strong nonideality of vapor and liquid phase of the quinary system.The binary parameters in the UNIQUAC model of methyl acetate-p-xylene and n-propyl acetate-p-xylene systems were obtained by regressing the phase equilibrium data from experiment.Combining with binary parameters of the other binary systems built-in simulation software,the mechanism model of heterogeneous azeotropic distillation was developed and the simulation of the industrial HAc dehydration process including dehydration column,PX pure column and entrainer recovered column was conducted with Aspen Plus.The simulation results of key parameters agree well with the process data with the errors within ±6%.Thus,the model can describe the HAc dehydration process accurately,and it lays a solid foundation for the further study of industrial acetic acid dehydration process.

关 键 词：醋酸脱水 参数拟合 非均相共沸精馏 流程模拟 

分 类 号：TQ028.4[化学工程]