Application of GC-FID/MS Method on the Investigation of Benzothiophene Transformation Under FCC Condition

By using relative quality response factor,a method was established to analyze sulfurcontaining compounds in liquid product by GC-FID/MS technology,and was applied to the investigation of benzothiophene transformation under FCC condition.The results showed that the method had high accuracy,and sulfur equilibrium exceeded 95% in benzothiophene cracking systems.Under FCC condition,it was very difficult for pure benzothiophene to be cracked into H2S.However,the conversion of benzothiophene and the selectivity of H2S were enhanced to a great extent after the addition of tetralin in reaction system,compared with pure benzothiophene system,and the sulfur content distributing in gasoline fraction decreased.