萃取精馏分离苯/环己烷共沸体系模拟与优化

doi:10.11949/j.issn.0438-1157.20150781

化工学报 ›› 2015, Vol. 66 ›› Issue (9): 3570-3579.DOI: 10.11949/j.issn.0438-1157.20150781

萃取精馏分离苯/环己烷共沸体系模拟与优化

翟建¹, 刘育良¹, 李鲁闽¹, 王秋圆², 孙兰义¹

1 中国石油大学(华东)重质油国家重点实验室, 山东青岛 266580;
2 青岛碱业新材料科技有限公司, 山东青岛 266043

收稿日期:2015-06-01 修回日期:2015-07-04 出版日期:2015-09-05 发布日期:2015-09-05
通讯作者: 孙兰义
基金资助:
国家自然科学基金项目(21276279,21476261);中央高校基本科研业务费专项资金项目(14CX05030A,14CX06108A)。

Simulation and optimization of extractive distillation for separation of azeotropic benzene/cyclohexane system

ZHAI Jian¹, LIU Yuliang¹, LI Lumin¹, WANG Qiuyuan², SUN Lanyi¹

1 State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Qingdao 266580, Shandong, China;
2 Qingdao Soda Ash Industrial New Material and Technology Company Limited, Qingdao 266043, Shandong, China

Received:2015-06-01 Revised:2015-07-04 Online:2015-09-05 Published:2015-09-05
Supported by:
supported by the National Natural Science Foundation of China (21276279, 21476261) and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (14CX05030A, 14CX06108A).

摘要/Abstract

摘要：

以糠醛作为萃取剂分别使用常规萃取精馏、隔壁塔萃取精馏和差压热集成萃取精馏对苯和环己烷体系进行分离研究,使用流程模拟软件Aspen Plus V8.4进行模拟分析,对初步设计的三稳态流程,分别进行灵敏度分析,使用多目标遗传算法对过程进行整体优化以获得最优结构参数。结果表明,隔壁塔萃取精馏和差压热集成萃取精馏相对于常规萃取精馏所需再沸器热负荷可分别减小21.5%和15.7%。对三工艺流程进行经济性分析,发现与常规流程相比,隔壁塔萃取精馏的年总费用下降了6.0%,而差压热集成萃取精馏年总费用增加了50.8%,为萃取精馏分离苯/环己烷共沸体系工业化设计提供了理论依据和设计参考。

关键词: 萃取, 隔壁塔, 差压热集成, 遗传算法, 节能, 优化

Abstract:

The separation of benzene and cyclohexane with furfural as entrainer was studied using conventional extractive distillation, extractive dividing wall column distillation and heat integrated pressure-swing extractive distillation. The three whole processes were simulated by commercial process simulator Aspen Plus V8.4. The sensitive analyses of all steady-state designs were carried out and the optimal flow sheets with minimum energy requirements have been established using the multi-objective genetic algorithm with constrains. Compared with the conventional configuration, the extractive dividing wall column distillation and heat integrated pressure-swing extractive distillation process with minimum heat duty of the reboiler presented the energy savings of 21.5% and 15.7%, respectively. The economic analysis was carried out to evaluate the economic feasibility of the three processes. The results clearly demonstrated that when compared with the conventional extractive distillation process, the total annual cost was reduced by 6.0% in the extractive dividing wall column and increased by 50.8% in the heat integrated pressure-swing extractive distillation, which provided a theory basis and design reference for the industrial design for extractive distillation process to separate azeotropic benzene and cyclohexane system.

Key words: extraction, dividing wall column, heat integrated pressure-swing, genetic algorithm, energy savings, optimization

中图分类号:

TQ028.1

翟建, 刘育良, 李鲁闽, 王秋圆, 孙兰义. 萃取精馏分离苯/环己烷共沸体系模拟与优化[J]. 化工学报, 2015, 66(9): 3570-3579.

ZHAI Jian, LIU Yuliang, LI Lumin, WANG Qiuyuan, SUN Lanyi. Simulation and optimization of extractive distillation for separation of azeotropic benzene/cyclohexane system[J]. CIESC Journal, 2015, 66(9): 3570-3579.

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萃取精馏分离苯/环己烷共沸体系模拟与优化

Simulation and optimization of extractive distillation for separation of azeotropic benzene/cyclohexane system

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