萃取精馏法精制1,2-环氧丁烷的研究  

Purification of 1,2-butylene oxide by extractive distillation

作　　者：辜乌根[1] 胡松[1] 李木金[1] 杨卫胜[1] 

机构地区：[1]中国石化上海石油化工研究院,上海201208

出　　处：《石油化工》2016年第7期834-840,共7页Petrochemical Technology

摘　　要：1-丁烯催化环氧法生产的1,2-环氧丁烷(BO)粗溶液中含有水、甲醇、丙醛、丙酮等杂质,这些杂质与BO的相对挥发度接近于1,用普通精馏难以得到高纯度的BO产品。用萃取精馏法,以3-甲基辛烷为萃取剂,应用流程模拟软件Aspen Plus数据库中NRTL模型对BO的萃取精馏过程进行了全流程模拟计算,确定了较优化的工艺参数:BO粗溶液进料量为1 000 kg/h,溶剂比(萃取剂与BO粗溶液的质量比)为4,萃取塔理论塔板数为40块,粗BO原料进料位置为第21块塔板,萃取剂进料温度为42℃,塔顶有机相回流量为89 kg/h,塔顶水加入量为62 kg/h;产品塔理论塔板数为16块,进料位置为第12块塔板,回流比为0.9。在上述工艺条件下,BO的产品纯度达到99.79%(w),水含量低于200×10-6(w),醛含量低于50×10-6(w),可用作聚合单体。The crude 1,2-butylene oxide（BO） which was produced with the catalytic epoxidation of 1-butylene contained water,methanol,propanal,acetone and other impurities. The relative volatilities of these impurities to BO were close to 1,so it was hard to separate the impurities by the conventional distillation to obtain high purity BO. The extractive distillation approach was applied to purify BO with the selected extraction solvent 3-methyloctane. The extractive distillation process was simulated and investigated by using NRTL model in Aspen Plus,and the condition was obtained as follow：crude BO flowrate of 1 000 kg/h, solvent ratio of 4,theoretical plate number of the extractive distillation column of 40,crude BO feed stage of 21st,feed temperature of extraction solvent of 42℃,organic reflux flowrate and water flowrate of the extractive distillation column of 89 kg/h and 62 kg/h respectively,theoretical plate number of the product column of 16,feed stage of 12th, reflux ratio of 0.9. The results demonstrated that the purity of BO product can reach 99.79%（w） with the proposed extractive distillation process, and the water and aldehydes mass fraction of BO product were less than 200×10-6（w） and 50×10-6（w） respectively,which can be used as the polymeric monomer.

关 键 词：1 2-环氧丁烷 萃取精馏 流程模拟 

分 类 号：TQ028[化学工程]