METHOD OF ADDING ZSM-5 CONTAINING CATALYST TO FLUID BED CATALYTIC CRACKING UNITS

摘要

METHOD OF ADDING ZSM-5 CONTAINING CATALYST TO FLUID BED CATALYTIC CRACKING UNITS ZSM-5 additive catalyst is added to the equilibrium catalyst in an FCC unit in a programmed manner so that an immediate boost in gasoline product octane number, typically 1/2-2.0 octane number, is achieved. Thereafter, ZSM-5 addition at a reduced rate is continued to maintain product octane number.