Abstract: The sulfur containing compounds distributions of various FCC gasoline fractions, sulfur containing compounds distributions of heavy fraction prior and post to selective hydrodesulfurization (HDS) were studied, as well as the effect of reaction temperature on the sulfur distribution. Test results show that sulfur containing compounds mainly distribute in the high boiling range fraction of FCC gasoline, existing as C2—C4 thiophens and benzothiophene. During the hydrogenation process, mercaptan, tetrahydrothiophene, benzothiophene are easy to be removed, yet the removal of 2-methylthiophene and C2 thiophene is a bit hard. The impact of reaction temperature is significant, above 265 ℃, the HDS rate reaches 99%, only a small amount of 2-methylthiophene and C2 thiophene remains in the hydrogenated gasoline; however, below 265 ℃, the HDS rate is low and it increases with the increase of reaction temperature.

Key words: FCC naphtha, hydrogenation, sulfur speciation distribution , reaction temperature