乙醇法丁二烯精制工艺的设计与模拟

Design and simulation of refining process of crude butadiene from ethanol

基于当前生产高纯度丁二烯的乙烯副产C4馏分抽提法,针对乙醇法粗丁二烯的具体组成,设计了一级萃取精馏精制乙醇法粗丁二烯的工艺流程。利用Aspen Plus对其中的萃取精馏塔和汽提塔进行了模拟和优化。通过模拟计算,得到了合适的腈烃比以及萃取精馏塔和汽提塔最优的进料位置、理论板数、回流比。在优化所得条件下,最终可得质量分数99.83%的丁二烯产品。

Basing on the current extractive distillation process for high purity butadiene from the by-product C4 of ethylene cracking,a new process containing one extractive distillation unit is proposed to refine crude butadiene from ethanol. Key section of this process,the extractive distillation system,is simulated using Aspen Plus. Through the simulation,the suitable mass ratio of acetonitrile to C4 mixture,the optimal parameters of the extractive distillation column and the stripping column are obtained. Under the optimum conditions,the final purity of butadiene can reach99. 83 wt%.