化工进展 ›› 2016, Vol. 35 ›› Issue (S2): 56-60.DOI: 10.16085/j.issn.1000-6613.2016.s2.009

• 化工过程与装备 • 上一篇    下一篇

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

胡子益1, 李洪波1, 谭宇鑫2, 陈跃洋2, 李砚硕1, 杨维慎1   

  1. 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
  • 收稿日期:2016-09-01 修回日期:2016-09-08 出版日期:2016-12-31 发布日期:2016-12-22
  • 通讯作者: 杨维慎,研究员,博士生导师,主要从事高性能无机膜材料的优化设计与合成。E-mail:yangws@dicp.ac.cn。
  • 作者简介:胡子益(1983-),男,工程师,主要从事分子筛膜应用研究。E-mail:huziyi@dicp.ac.cn。

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

HU Ziyi1, LI Hongbo1, TAN Yuxin2, CHEN Yueyang2, LI Yanshuo1, YANG Weishen1   

  1. 1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, Dalian 116023, Liaoning, China;
    2. Dalian HST Co., Ltd, Dalian 116023, Liaoning, China
  • Received:2016-09-01 Revised:2016-09-08 Online:2016-12-31 Published:2016-12-22

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。

关键词: 费托合成, 混合醇, 萃取精馏, 分子筛膜, 渗透汽化

Abstract: 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.

Key words: Fischer-Tropsch synthesis, mixed alcohols, extractive distillation, zeolite membrane, pervaporation

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