Abstract: The reaction rules of hydrocarbons, sulfides and nitrides in S Zorb process were studied. It is shown that some of the olefins are hydrogenated, small amount of hydrocarbon cracking reactions and denitrification reactions occur during desulfurization reactions in S Zorb process. When the FCC gasoline with olefin of 22.83% and sulfur of 325 μg/g is used to produce clean gasoline with sulfur content less than 10 μg/g by S Zorb process, the olefin saturation rate is 15.16%, the hydrocarbon cracking rate is 1.19%, and RON loss is less than 0.8. The removal rate for both mercaptan and thioether is close to 100%. 2-methyl thiophene and 3-methyl thiophene are the main residual sulfur compounds in refined gasoline. The aniline compounds in FCC gasoline are the primary nitrides. Its removal rate is 32.4% for this feed in S Zorb process.

Key words: FCC gasoline, adsorption, desulfurization, octane number