从喹啉釜残液中提取高品质吲哚的工艺研究  

Study on the Extraction of High Quality Indoles From Quinoline Still Residue

作　　者：田兆伟 冯博 周小野 李路浩 TIAN Zhao-wei;FENG Bo;ZHOU Xiao-ye;LI Lu-hao(Huanghua Xinnuo Lixing Fine Chemical Co.,Ltd.,Huanghua Hebei 061100,China)

机构地区：[1]黄骅市信诺立兴精细化工股份有限公司,河北黄骅061100

出　　处：《当代化工》2020年第8期1679-1682,共4页Contemporary Chemical Industry

摘　　要：吲哚是重要的精细有机化工品,以喹啉釜残液为原料,通过质量分数12%的硫酸洗涤去除喹啉、异喹啉、2-甲基喹啉等组分;利用双溶剂萃取原理去除α-甲基萘、β-甲基萘等非极性物质,将吲哚质量分数提高至97.66%;对萃取液进行减压蒸馏,吲哚质量分数提高至99.73%;利用乙醇-环己烷混合溶剂对吲哚馏分进行溶剂结晶,吲哚质量分数提高至99.99%;吲哚提纯工艺的单程收率为47.68%。Indole is important fine organic chemical.In this paper,indole was obtained from quinoline still residue through removing quinoline,isoquinoline and 2-methylquinoline components by 12%sulfuric acid washing.Then the indole purity was increased to 97.66%through removing non-polar substances of alpha-methylnaphthalene and beta-methylnaphthalene by double solvent extraction.The purity of indole was again increased to 99.73%by vacuum distillation.The indole was crystallized by ethanol-cyclohexane mixture,the purity of indole was finally increased to 99.99%.The single-pass yield of indole purification was 47.68%.

关 键 词：喹啉釜残液 双溶剂萃取 减压精馏 溶剂结晶 

分 类 号：TQ251.34[化学工程—有机化工]