环氧丁烷尾气溶剂吸收及精制工艺  

A process for offgas absorption and purification of 1,2-butylene oxide

作　　者：李木金 胡松 施德磐 赵鹏 高瑞 李进龙 LI Mujin;HU Song;SHI Depan;ZHAO Peng;GAO Rui;LI Jinlong(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,SINOPEC Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201208,China;School of Petrochemical Engineering,Changzhou University,Changzhou 213164,Jiangsu,China)

机构地区：[1]中石化(上海)石油化工研究院有限公司,绿色化工与工业催化国家重点实验室,上海201208 [2]常州大学石油化工学院,江苏常州213164

出　　处：《化工学报》2023年第4期1607-1618,共12页CIESC Journal

基　　金：国家自然科学基金项目(21878025);国家自然科学基金-企业联合基金项目(21875096,U19B60021005505)。

摘　　要：针对以过氧化氢乙苯法生产1,2-环氧丁烷(简称环氧丁烷)工艺中环氧丁烷尾气难回收问题,提出了以环氧丁烷精制单元萃取剂正辛烷为吸收剂和利用精制单元萃取精馏塔同时作为解吸塔的环氧丁烷回收新工艺。该工艺同时考虑无催化环氧丁烷水解生成1,2-丁二醇,利用1,2-丁二醇与正辛烷可形成最低温度非均相共沸物特性,侧线采出共沸物脱除1,2-丁二醇达到纯化循环萃取剂提高萃取效率的分离目标。选用NRTL热力学方法,对上述流程进行了全流程模拟和优化设计,分析了溶剂比、理论塔板数、吸收剂进料温度等主要工艺参数对分离的影响规律。结果表明:新工艺对环氧丁烷回收率达到99.99%(质量),对环氧丁烷工业装置产能提升、节能降耗和挥发性有机物(VOCs)治理具有实际应用价值。In view of the difficulty of recovering 1,2-butylene oxide(BO)contained in tail gas in ethylbenzene hydroperoxide 1,2-butylene oxide(EBHP)plant,a novel absorption process for BO recovery with extraction solvent and extractive distillation(as desorption column)was proposed in this work,in that the reaction of both BO noncatalyzed hydrolysis reaction was considered.Meanwhile,the separation efficiency affected from solvent was characterized and solved based on the characteristics of liquid-liquid split for 1,2-butylene glycol(12BDO)and extraction solvent mixture at certain condition.The simulation and design optimization for the full process using Aspen Plus package with NRTL thermodynamic model were carried out.The influence of the main technological parameters,such as solvent ratio,the number of theoretical plates and the feed temperature of solvent was discussed.The results show that the new process has a recovery rate of 99.99%(mass)for butylene oxide,which has practical application value for the production capacity improvement of butylene oxide industrial equipment,energy saving and consumption reduction,and volatile organic compounds(VOCs)treatment.

关 键 词：过氧化氢乙苯法 环氧丁烷 吸收 萃取精馏 

分 类 号：TQ028.8[化学工程]