煤焦油软沥青中多环芳烃的分离及其成分分析  

Separation of polycyclic aromatic hydrocarbons in soft pitch from coal tar and its compositions analysis

作　　者：罗道成[1,2] 刘俊峰[1] 郑李辉[1] 安静[1] 汪威[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201 [2]湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室,湖南湘潭411201

出　　处：《煤炭学报》2011年第11期1901-1905,共5页Journal of China Coal Society

基　　金：湖南省自然科学基金资助项目(05JJ30144);湖南省教育厅资助科研项目(07C290)

摘　　要：将煤焦油在380℃下蒸馏得到软沥青,在室温下用等体积的二硫化碳-丙酮混合溶剂对软沥青进行超声辐射萃取,软沥青中多环芳烃(PAHs)被混合溶剂萃取,用硅胶吸附萃取物,以环己烷、甲苯、石油醚为洗脱液分别洗脱硅胶,采用柱层析法对软沥青中多环芳烃进行了分离。在定量收取的洗脱液中分别析出了白色晶体、白色粉状物质和无色晶体(分别标记为P1、P2、P3),用气相色谱-质谱联用仪(GC/MS)分别对P1、P2、P3进行了分析。结果表明,P1主要为3个环的多环芳烃和杂环化合物,P2主要为4个环的多环芳烃和杂环化合物,P3全部为4～5个环的多环芳烃。Soft pitch was prepared by distilling coal tar at 380 ℃.Soft pitch was extracted with isometric carbon disulfide-acetone mixed solvent under ultrasonic radiation and room temperature.Polycyclic aromatic hydrocarbons（PAHs） in soft pitch were extracted by mixed solvent.The extracts were absorbed by silica gel.The silica gel was eluted with cyclohexane,methylbenzene and petroleum ether respectively,PAHs in soft pitch were separated by using column chromatographic method.A white crystal,a white powder and a colorless crystal（marked as P1,P2,P3 respectively） appeared in three eluents,and P1,P2 and P3 were analyzed with GC-MS respectively.The results show that P1 is mainly composed of 3-ring PAHs and heterocyclic compounds,P2 is mainly composed of 4-ring PAHs and heterocyclic compounds,and P3 is composed of 4-ring or 5-ring PAHs.

关 键 词：煤焦油沥青 二硫化碳-丙酮混合溶剂 柱层析法 GC-MS分析 

分 类 号：TQ522.63[化学工程—煤化学工程]