Effect of hydrogen transfer reaction on quality of FCC gasoline

The production of gasoline with high octane number, low-sulfur and low-olefin contents from heavy sour crude is a challenge to catalytic cracking unit. Hydrogen transfer is one of the characteristics of catalytic cracking reaction. The profile of cracked products can be adjusted in a wide range by the degree of hydrogen transfer reaction. Close attentions has been paid by research personnel to the fact that the sulfur and olefin contents in FCC gasoline can be directly decreased by regulating hydrogen distribution via hydrogen transfer reaction. The hydrogen transfer reaction and its effects on the yield and octane number of gasoline were outlined. Research progress in regulating hydrogen distribution by taking advantages of hydrogen transfer reaction to reduce the sulfur and olefin contents in FCC gasoline was introduced and influences of operating conditions and catalyst were also analyzed and discussed.