甲基丙烯酸甲酯/甲醇/水共沸体系变压精馏分离工艺的模拟与优化

Simulation and optimization of pressure swing distillation separation process for methyl methacrylate/methanol/water azeotropic system

对甲基丙烯酸甲酯/甲醇/水三元共沸混合物分离进行了常规变压精馏和双效热集成变压精馏模拟。以年总费用(TAC)为目标函数,对进料板位置、回流比、塔板数等参数进行了优化。在常规变压精馏工艺中,高压塔进料板位置最佳为第10块板、回流比为0.4、塔板数为23块,低压塔最佳进料板位置为第15块板、回流比为1.0、塔板数为60块,高压塔与低压塔的操作压力分别为300 kPa和10 kPa。在优化后的常规变压精馏基础上,提出了双效热集成变压精馏工艺,与常规变压精馏工艺相比,双效热集成变压精馏工艺的再沸器与冷凝器负荷分别下降34.81%和34.92%,TAC下降31.40%。

The separation simulation of methyl methacrylate/methanol/water ternary azeotropic mixture was carried out by pressure swing distillation and dual-effect heat integrated pressure swing distillation.With the total annual cost(TAC)as the objection function,the parameters such as feed plate,reflux ratio and plate number were optimized.In the conventional pressure swing distillation process,the feed plate,reflux ratio and plate number of the high-pressure tower is 10,0.4,and 23,respectively,and the low-pressure tower is 15,1.0,and 60,respectively.The operating pressure of the high-pressure tower and the low-pressure tower is 300 kPa and 10 kPa,respectively.Based on the optimized conventional pressure swing rectification,an improved dual-effect heat integrated pressure swing rectification process was proposed.Compared with the conventional pressure swing distillation,the load of reboiler and condenser of the dual-effect heat integrated pressure swing distillation process is reduced by 34.81%and 34.92%,respectively,and the TAC is reduced by 31.40%.