重油催化裂化汽油中含硫化合物的分析

Analysis of Sulfur Compounds in Residue Fluid Catalytic Cracking Gasoline

采用气相色谱法 ,分别利用火焰光度检测器 (FPD)和原子发射检测器 (AED)对中国石化北京燕山石油化工公司 (简称燕化 )炼油厂和石家庄炼油厂生产的重油催化裂化 (RFCC)汽油中的硫化物进行了分析。燕化炼油厂RFCC汽油中总硫只有 2 9 5mg/L ,采用FPD无法检测 ;石家庄炼油厂的RFCC汽油中总硫为 72 0 1mg/L。用标样和气相色谱 质谱法 (GC MS)定性 ,FPD分离检测出 19种硫化物 ,主要是硫醇、噻吩类硫化物 ,硫醚类硫化物和二硫化物均未检出。用AED鉴定出燕化炼油厂RFCC汽油中的硫化物 12种 ,主要是噻吩和四氢噻吩类、低碳硫醇和二硫化物 ;石家庄炼油厂的RFCC汽油中的硫化物 2 6种 ,也主要以噻吩类为主 ,另有少量的低碳硫醇、硫醚和二硫化物。结果表明 ,用AED检测RFCC汽油中的硫化物 ,其灵敏度和选择性都高于目前使用最普遍的FPD。

Sulfur compounds in residue fluid catalytic cracking (RFCC) gasolines from Refinery of SINOPEC Beijing Yanshan Company and Refinery of Shijiazhuang were analyzed by gas chromatograph connected with flame photometric detector (FPD) and atomic emission detector (AED). Twelve and 26 kinds of sulfur compounds were detected by AED in RFCC gasolines from Yanshan and Shi jiazhuang respectively. Only 0 and 19 kinds of sulfur compounds were found by FPD in these two gasolines respectively. The experimental results demonstrated that AED is more sensitive and selective to sulfur compounds than FPD. It also indicated that thiophenes were the major sulfur compounds in the RFCC gasoline. In addition, mercaptan, sulfoether and disulfide species were found.