Patent ID: 6083379
Filing Date: 2000-07-04
Classification: C10G

Abstract:
A process for desulfurizing a cracked gasoline feedstock comprising at least about 20 ppmw sulfur, said process comprising:separating said cracked gasoline feedstock into a light fraction comprising at least one hydrocarbon having less than 8 carbon atoms per molecule and a heavy fraction comprising at least one hydrocarbon having more than 7 carbon atoms per molecule;contacting said light fraction with a catalyst composition comprising a zeolite, under reaction conditions for aromatizing hydrocarbons, to produce an intermediate product stream such that the combined total octane of said heavy fraction and said intermediate product stream exceeds the total octane of said cracked gasoline feedstock;separating said intermediate product stream into an overhead stream comprising a light olefin and a bottoms stream comprising an aromatic; andcontacting at least a portion of said bottoms stream and at least a portion of said heavy fraction with a hydrodesulfurization catalyst composition, under reaction conditions for desulfurizing sulfur containing hydrocarbons, to produce a desulfurized product stream having less than about 10 ppmw sulfur such that the combined total octane of the remaining portion of said bottoms stream, the remaining portion of said heavy fraction, the overhead stream, and the desulfurized product stream is at least the same as the total octane of said cracked gasoline feedstock.