完全热集成变压精馏分离乙酸乙酯和甲醇的模拟  

Simulation of pressure-swing distillation with full heat integration for separation of acetic ether and methanol

作　　者：刘乔[1] 高瑞昶[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《现代化工》2016年第11期188-192,194,共6页Modern Chemical Industry

摘　　要：采用Aspen Plus软件及NRTL模型对乙酸乙酯-甲醇物系进行了完全热集成变压精馏模拟操作。以乙酸乙酯和甲醇的质量分数为约束函数,以塔釜的热负荷为目标,对两塔的理论板数、进料位置以及回流比进行了优化。基于完全热集成工艺的优化结果为高压T1塔理论板数16块,原料进料位置为第8块板,循环物料进料位置第4块板,回流比为4;常压T2塔理论板数28块,进料位置为第11块板,回流比为5.7。T1高压塔塔底得到的乙酸乙酯和T2常压塔塔底甲醇质量分数都能达到99.5%的分离要求,与传统的变压精馏相比完全热集成变压精馏能耗降低49%。通过实验室的间歇变压精馏小试实验验证,可以分离得到高纯度的乙酸乙酯和甲醇,对实际工艺操作和设备改造有一定的指导意义。The simulation is performed by the Aspen Plus software using the NRTL model in this study. The effects of stage numbers, feed location and reflux ratio on the product yield and energy consumption of tower T1 and T2 are analyzed. The results show that EA-MeOH can be efficiently separated by full heat integration pressure-swing distillation, and the optimal conditions are obtained. For the high pressure tower T1, the theoretical stage number, the feed location, the recycle feed location and the reflux ratio are 16,8,4 and 4 respectively. For the atmospheric tower T2 ,the theoretical stage number, the feed location and the reflux ratio are 28,11 and 5.7 respectively. The purity of EA and MeOH can both reach 99. 5 % of the standard samples. Meanwhile, pressure-swing distillation with full heat integration can save 49% of energy, compared with the conditional pressure-swing distillation. High purity ethyl acetate and methanol can be attained through batch pressure-swing distillation experiment in laboratory, which has significant guide for the actual process operation and equipment modification.

关 键 词：完全热集成 变压精馏 乙酸乙酯 甲醇 

分 类 号：TQ028[化学工程]