汽油中有机硫化物的酸富集和结构分析

石油中发现的硫化物已超过250种，其中约有1／4存在于汽油中。由于汽油中每种硫化物的含量都很低，又有十分复杂的烃组分和含氮组分的干扰，单纯使用仪器方法对汽油中的有机硫化物进行结构分析是十分困难的。通常的做法是对汽油样品进行预处理，使硫化物从混合烃体系中分离出来，再通过仪器和相应标样进行类型分析或结构鉴定。目前研究者在此方面做了很多工作，花瑞香等用29种硫化物标样，采取GC／SCD辅以选择性化学反应对汽油馏分的硫化物形态分布研究。

Enrichment and structure analysis of organic sulfur compounds in gasoline

Enrichment of organic sulfur compounds in gasoline was investigated with acid extracting agent (sulfuric acid + phosphoric acid + water) and solvent n-hexane. Sulfides and thiophene derivatives in gasoline are extracted into n-hexane; the concentration of sulfur compounds enriched in n-hexane can be higher than 12 times of the sulfur concentration in gasoline sample. Thus, sulfides and thiophene derivatives enriched in n-hexane can be analyzed easily by using a gas chromatography with flame photometric detector (GC-FPD) and a gas chromatography mass spectrometry (GC-MS) because of less interference of hydrocarbon. In this work, 52 sulfur compounds were detected with GC-FPD, of which 14 sulfur compounds with determinate structures were identified with GC-MS.