含盐二甲基甲酰胺溶液萃取精馏分离苯-正庚烷的研究  

Separation of n-Heptane from Benzene by Extractive Rectification with Salted Dimethylformamide

作　　者：董红星 刘剑[1] 王文浪[1] 黎亚明 裴健[1] 

机构地区：[1]哈尔滨工程大学化工学院,黑龙江哈尔滨150001

出　　处：《石油化工》2005年第4期360-363,共4页Petrochemical Technology

摘　　要：以含盐二甲基甲酰胺溶剂为萃取剂,利用加盐萃取精馏方法对苯-正庚烷的分离进行研究。实验考察了盐的类型、盐的含量、萃取剂与原料体积比、溶剂的滴加方式等因素对釜液中正庚烷含量的影响。实验结果表明,当原料液中正庚烷体积分数为10%、快速滴加萃取剂、V(萃取剂)∶V(原料)=1.2、KSCN的质量分数为12%的条件下,塔顶馏出物中正庚烷的质量分数可达95%,塔釜液中正庚烷的质量分数可降至0.8%。Separation of n-heptane from benzene by extractive rectification with salted liquid was studied. Salted dimethylformamide (DMF) was chosen as extractant. Influences of salt type, salt content, volume ratio of solvent to feed, manner of solvent adding on n-heptane content in bottom residue were investigated. When continuously adding of extractant, V(extractant): V(feed) = 1.2, mass fraction of KSCN salt selected, 12%, and volume fraction of n-heptane in feed 10%, n-heptane mass fraction in overhead product and bottom residue could reach 95% and 0.8% respectively.

关 键 词：苯 正庚烷 二甲基甲酰胺 加盐萃取精馏 

分 类 号：TQ330.34[化学工程—橡胶工业]