反应精馏隔壁塔制甲缩醛过程模拟与分析

Simulation and analysis of reactive dividing-wall column for methylal production process

甲缩醛(methylal)是一种重要的化工基本原料,广泛应用于化工中间体、溶剂、涂料及燃料添加剂等的生产中。目前,反应精馏技术是用于以甲醇和甲醛为原料制取甲缩醛的主要方法。利用Aspen Plus过程模拟软件模拟了常规的双进料甲缩醛反应精馏工艺流程,同时提出并模拟了反应精馏隔壁塔(RDWC)工艺制备甲缩醛的流程,通过对比来探究RDWC流程的优越性。结果表明,采用RDWC制备甲缩醛可避免中间组分在塔内的返混效应,同时可使年度总费用降低8.09%,显著提高过程的经济性。

Methylal is an important raw material used for the production of chemical intermediates, solvents, paints and fuel additives, etc. At present, reactive distillation technology is the main method for preparing methylal from methanol and formaldehyde. In this work, the reactive distillation with a dividing-wall column for producing methylal was proposed and simulated. The results show that the preparation of methylal by such a process can avoid the back mixing effect of the middle component in the column and reduce the total cost by 8.09% annually, then significantly improve the economics of the process.