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In deep hydrodesulfurization (HDS) of polyaromatic sulfur-containing compounds in light gas oil catalyzed by Co-Mo/Al2O3, the behavior of methyl-substituted benzothiophenes, monomethyldibenzothiophenes (C1-DBTs) and dimethyldibenzothiophenes (C2-DBTs) was traced under the following could be 2,3,7-trimethylbenzothiophene. The conversions of C1-DBTs other than 4-methyldibenzothiophene (4-MDBT) were very close to the conversion of nonsubstituted DBT.The behavior of three kinds of C2-DBTs other than 4,6-dimethyldibenzothiophene (4,6-DMDBT) was very similar to that of 4-MDBT.These C2-DBTs were deduced to be DBT substituted with a methyl group at 4-position. These results suggest that substitution only at 4-and 6-positions retards the HDS rate of DBT in light gas oil.

Hydrodesulfurization of polyaromatic sulfur-containing compounds in light oil was carried out by using Co-Mo/Al2O3 under experimental conditions representative of industrial practice. Alkyl-substituted dibenzothiophenes in light oil, especially 4,6-dimethyldibenzothiophene, were difficult to desulfurize even under deep desulfurization conditions.

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