基于隔壁精馏塔的甲醇制烯烃分离新工艺及Aspen实现

Design and Aspen implementation of a new separation process for methanol to olefins based on dividing wall column

对甲醇制烯烃粗产物的分离,设计一套基于隔壁精馏塔的分离新工艺。利用1个隔壁精馏塔,首先实现C-1、C2和C+3的清晰分割,然后经乙烯精馏塔、C3和C+4分离塔,丙烯精馏塔、C4和C+5分离塔,得到聚合级的乙烯和丙烯产品。利用Aspen plus软件对各精馏塔进行模拟和优化,得到各塔的塔参数和操作条件,进而对分离工艺进行全流程模拟。结果显示,乙烯和丙烯产品的质量分数分别达到99.99%和99.80%,满足聚合级的要求,说明本研究建立的基于隔壁精馏塔的甲醇制烯烃分离新工艺在技术上是可行的。

A new separation process for methanol to olefins based on dividing wall column was designed. First, a clear separation of C1 , C2 and C3 was achieved using a dividing wall column. And then polymeri zation grade ethylene and propylene was obtained through ethylene rectifier, separation column of C3 and C4＋ , propylene rectifier, separation column of C4 and C5＋ in turn. Every column was simulated and opti mized by Aspen plus software in order to obtain the column parameters and operating condition. Further more ,full process simulation of the new separation was carried out by Aspen. The results showed that the product＇s mass fraction of ethylene and propylene by the new separation process could reach 99.99% and 99.80% respectively, which achieved the requirement of polymerization. This shows that the new sep aration process for methanol to olefins based on dividing wall column designed which is feasible in tech nology.