分子筛膜-精馏耦合用于费托合成水相副产物混合醇回收的工艺流程模拟  

Zeolite membrane dehydration and distillation coupling process simulation of F-T water by-product recovery

作　　者：胡子益 李洪波[1] 谭宇鑫 陈跃洋 李砚硕[1] 杨维慎[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023 [2]大连海斯特科技有限公司,辽宁大连116023

出　　处：《化工进展》2016年第B11期56-60,共5页Chemical Industry and Engineering Progress

摘　　要：费托合成油水相副产物混合醇的回收多采用萃取精馏的分离方法,此方法需要配置7个精馏塔和5路循环回路。通过分析发现,流程冗长的关键因素在于混合醇中除甲醇外各个组分均与水产生共沸,而分子筛膜渗透汽化技术不受汽液平衡的限制,因此可以利用分子筛膜渗透汽化技术将混合醇中的水分先脱除,然后再利用精馏技术对混合醇各组分进行分离。本文完成了精馏-膜分离耦合工艺分离混合醇的全流程模拟,并与传统的萃取精馏工艺流程进行对比。精馏-膜分离耦合工艺大幅简化了原有萃取精馏工艺流程,整体能耗降低30%。并根据此流程在陕西延长石油(集团)有限公司建成了国内第一套膜分离-精馏耦合工艺的1000t/a低碳混合醇回收和分离的工业示范装置。Extractive distillation could be used for recovery of by-product mixed alcohols from waste water of F-T process. This process contains 7 columns and 5 circles. The reason of the complexity of this process is the formation of azeotropes between water and alcohols except methanol. Zeolite membrane based pervaporation is an advanced separation technology that is not restricted by vapor liquid equilibrium. Therefore, it would be feasible to use zeolite membrane pervaporation to dewater the mixed alcohol solution first, and then to separate the mixed alcohol components using distillation technology. This paper reports the whole process simulation of the pervaporation-distillation integrated process, and compared with traditional extractive distillation process. The pervaporation-distillation integrated process greatly simplifies the mixed alcohol recovery process. The overall energy consumption could be reduced by 30% . Based to this process design, cooperating with Shanxi Yanchang Petroleum （group） Co., Ltd, we built the first industrial demonstration unit of pervaporation-distillation integrated process for recovery of mixed alcohols from F-T waste water with a capacity of 1000t/a.

关 键 词：费托合成 混合醇 萃取精馏 分子筛膜 渗透汽化 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]