隔壁萃取精馏分离环己烷-环己烯过程的模拟与优化

石油炼制与化工 ›› 2024, Vol. 55 ›› Issue (5): 135-140.

隔壁萃取精馏分离环己烷-环己烯过程的模拟与优化

刘澳琦,李强,石晓青,周诚,师丽

中石化石油化工科学研究院有限公司

收稿日期:2023-11-07 修回日期:2024-01-17 出版日期:2024-05-12 发布日期:2024-05-06
通讯作者: 李强 E-mail:liq.ripp@sinopec.com

SIMULATION AND OPTIMIZATION OF EXTRACTIVE DIVIDING WALL COLUMN FOR CYCLOHEXANE/CYCLOHEXENE SEPARATION

Received:2023-11-07 Revised:2024-01-17 Online:2024-05-12 Published:2024-05-06
Contact: Qiang Li E-mail:liq.ripp@sinopec.com

摘要/Abstract

摘要： 针对苯部分加氢制环己烯产物中环己烷和环己烯的分离问题，在常规萃取精馏的基础上提出了隔壁萃取精馏（EDWC）方案。通过萃取剂筛选，确定以二甲基亚砜作为萃取剂，分别采用常规萃取精馏和EDWC技术对环己烷-环己烯进行分离。利用化工流程模拟软件Aspen Plus搭建常规萃取精馏流程及EDWC三塔流程等效严格模型，通过单变量分析得到模拟计算初值。基于多目标遗传算法（NSGA-Ⅱ）对EDWC流程进行多目标优化，输出Pareto解集，筛选年总成本（TAC）和CO₂排放量均较小的一组解与常规萃取精馏流程进行对比。模拟计算结果表明，与常规萃取精馏流程相比，EDWC流程可以节约TAC 9.46%，减少碳排放17.25%，说明采用EDWC技术进行环己烷-环己烯的分离是一种有效的节能降碳方法。

关键词: 萃取精馏, 隔壁塔, 多目标算法, 环己烷, 环己烯, 二甲基亚砜

Abstract: In view of the separation of cyclohexane and cyclohexene in the product of partial hydrogenation of benzene to cyclohexene, an extractive dividing wall column(EDWC) process based on conventional extractive distillation process was proposed. The separation of cyclohexane and cyclohexenewas carried out by conventional extractive distillation and EDWCwith dimethyl sulfoxide as extractant.The equivalent and strict models of conventional extractive distillation and EDWC three-columnprocess were established by using Aspen Plus software, and the univariate analysis was carried out to obtain initial values for simulation. Based on multi-objective evolutionary algorithm (NSGA-Ⅱ),the multi-objective optimization of EDWC process was carried out, Pareto optimal solutions were obtained, and a set of solutions with the minimum annual total cost (TAC) and CO₂ emission were selected and compared with the conventional extraction distillation process. The simulation calculation results showed that compared with the conventional extraction distillation process, EDWC process could save TAC by 9.46% and reduce carbon emission by 17.25%. The results also revealed that the EDWC process was an effective energy-saving and carbon reduction method for separating cyclohexane and cyclohexene.

Key words: extraction distillation, dividing wall column, multi-objective algorithm, cyclohexane, cyclohexene, dimethyl sulfoxide

刘澳琦李强石晓青周诚师丽. 隔壁萃取精馏分离环己烷-环己烯过程的模拟与优化[J]. 石油炼制与化工, 2024, 55(5): 135-140.

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