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采用MDS-H_2 O-KOH萃取剂体系对胜利炼油厂电精制前FCC汽油、碱洗后以及不同脱臭工艺脱臭后汽油的硫醇进行了分离,并通过气相色谱火焰光度检测器对硫醇进行鉴定.结果表明,脱臭前FCC汽油中共鉴定出C_3～C_9硫醇20多种,其中C_4以下低级硫醇含量较高;在脱臭后汽油中,主要含有中间分子量以上(C_5以上)的异构硫醇.汽油中不同结构硫酸脱臭难易次序为:C_5以上的异构硫醇最难被脱除,其次是高级正构硫醇,C_4以下硫醇较易脱除.提高FCC汽油脱臭深度的关键是提高对C_5以上异构硫醇的脱除率.
The MDS-H 2 O-KOH extractant system was used to separate the mercaptan from the gasoline refinery pre-refined FCC gasoline, caustic wash and gasoline deodorization after deodorization process, and the mercaptan was identified by gas chromatographic flame photometric detector The results showed that more than 20 kinds of C_3 ~ C_9 mercaptans were identified in the FCC gasoline before deodorization, among which the content of lower mercaptans below C_4 was higher. Among the gasoline after deodorization, the main mercaptans containing above intermediate molecular weight (above C_5) The order of deodorization of sulfuric acid with different structures in gasoline is the most difficult to remove the isomerization mercaptan with the above C_5 followed by the higher normal mercaptan and the mercaptan below C_4 is easier to remove.The key to improve the deodorization depth of FCC gasoline is Improve the C_5 above isomerization thiol removal rate.