隔壁萃取精馏分离环己烷-环己烯过程的模拟与优化  

SIMULATION AND OPTIMIZATION OF EXTRACTIVE DIVIDING WALL COLUMNFOR CYCLOHEXANE CYCLOHEXENE SEPARATION

作　　者：刘澳琦 李强 石晓青 周诚 师丽 Liu Aoqi;Li Qiang;Shi Xiaoqing;Zhou Cheng;Shi Li(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083)

机构地区：[1]中石化石油化工科学研究院有限公司,北京100083

出　　处：《石油炼制与化工》2024年第5期135-140,共6页Petroleum Processing and Petrochemicals

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CO_(2)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。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 cyclohexene was carried out by conventional extractive distillation and EDWC with dimethyl sulfoxide as extractant.The equivalent and strict models of conventional extractive distillation and EDWC three-column process 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 CO_(2) 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.

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 

分 类 号：TQ028.32[化学工程] TQ231