Abstract: Biodesulfurization experiments were carried out to compare the sulfur removal rates of various oil products using cell engineering bacteria obtained by inter-kingdom protoplast fusion. Test results show that benzothiophene, dibenzothiophene, 4,6-dimethyl dibenzothiophene and diphenyl sulfide can be degradated by cell engineering bacteria simultaneously. Organic sulfur containing compounds in various oil products can be removed by cell engineering bacteria directly, especially, the removal of residue sulfur containing compounds in hydrotreated oil products was significant.

Key words: cell engineering bacteria, sulfur compound, petroleum products