Abstract: The method for separation and determination of sulfur compounds in FCC liquid products by gas chromatography
with pulse flame photometry detector（GC-PFPD）is established. The qualitative and quantitative analysis of the main sulfide
are made based on the retention time of some pure sulfide and literatures. The results show that the main sulfide are thiophenes，
benzothiophenes and dibenzothiophenes. Different average correcting factors are used to quantify total sulfur and sulfur compounds
in gasoline and diesel oils fractions in FCC liquid products. The method is applied for determination of the contents of
total sulfur and sulfur compounds as a function of the ratio of catalyst to oil and reaction temperature.

Key words: gas chromatography with pulse flame photometry det, catalytic cracking, sulfide, liquid products, analysis