基于双塔精馏的甲醇-碳酸二甲酯分离工艺

摘要

Two kinds of double-column distillation process, double effect heat integration distillation and separate heat pump distillation, for separation of methanol-dimethyl carbonate system were simulated based on the methanol-dimethyl carbonate system azeotropic character. The binary interaction parameters of Wilson equation were fitted against the reported experimental data of methanol-dimethyl carbonate system. Based on the minimum annual total cost, simulations for the two kinds of double-column distillation process were performed by Aspen Plus software to achieve the optimal condition. The simulation results showed that the two kinds of double-column distillation need lower energy consumption and less annual total fee. Compared with double effect heat integration distillation, separate heat pump distillation can save total capital fee by 2.69% and annual total fee by 17.33%.%基于甲醇和碳酸二甲酯体系的共沸特性,应用双效热集成和分割式热泵两种双塔精馏工艺进行该体系的分离研究。利用文献报道的实验数据对选用的Wilson物性方程中的二元交互作用参数进行回归修正。利用Aspen Plus模拟软件,以年运行总费用最小为目标函数,分别对提出的两种双塔精馏工艺进行模拟与优化,得到合适的工艺参数。模拟结果表明,两种双塔精馏工艺均比单塔加压精馏工艺其能耗更低、年运行总费用更少。就两种双塔精馏工艺而言,分割式热泵精馏工艺较双效热集成精馏工艺,可节约设备投资费用约2.69%,年运行总费用节约17.33%。