考虑不同产品选择性目标的乙醇胺反应精馏塔模拟与优化

Simulation and optimization of reactive distillation column for ethanolamine production considering different products selectivity

提出以环氧乙烷和液氨为原料,水为催化剂,反应精馏塔合成乙醇胺的工艺。分别以一乙醇胺(MEA)和二乙醇胺(DEA)的选择性最大为目标,探讨了在同一反应精馏塔中实现不同产物选择性目标的可行性和可达到的最大选择性。研究在Aspen Plus模拟软件上进行,通过考察操作压力、水进料量、进料氨烷比、再沸比、环氧乙烷进料位置等参数对反应精馏的影响规律,取得实现不同产物选择性目标的参数优化调节方法。研究表明,大的氨烷比、水进料量和再沸比有利于提高MEA选择性,小的氨烷比、水进料量和再沸比则有利于提高DEA选择性,在优化条件下,MEA选择性可达70.30%,DEA选择性可达41.89%。与文献方法比较,采用反应精馏合成乙醇胺具有明显的优越性和操作柔性。

A reactive distillation(RD) process for the production of ethanolamine from ethylene oxide(EO) and ammonia catalyzed by water was presented. The feasibility and maximum selectivity of different products selectivity in a reactive distillation column were discussed. Aspen Plus software package was used to simulate the process. The effects of operating pressure, water feed flow, molar feed ratio of NH3 to EO, boilup ratio and EO feed location on the RD column performance were investigated and the optimal operating parameters considering different product selectivities were obtained. The results showed that MEA selectivity could be increased with a larger NH3/EO ratio,water feed flow and boil up ratio, while DEA selectivity could be increased with a smaller NH3/EO ratio, water feed flow and boil up ratio. Under optimum conditions, the selectivity of MEA and DEA could reach 70.30% and41.89%, respectively. The studies indicated that the production of ethanolamine by RD had more operational flexibility and obvious advantages compared with the literature methods.