Patent ID: 8608944
Filing Date: 2013-12-17
Classification: C07C,C10G,Y02P

Abstract:
1. A catalytic conversion process for increasing light olefin yield, comprising the steps of: bringing a hydrocarbon oil feedstock comprising vacuum gas oil into contact with a catalytic conversion catalyst in a catalytic conversion reactor, wherein the catalyst is introduced through a catalyst inlet and comprises a medium pore shape-selective zeolite having an average pore diameter less than about 0.7 nanometers and the catalytic conversion reactor comprises one or more reaction zones; injecting an inhibitor into the catalytic conversion reactor through one or more injection sites wherein the inhibitor inhibits a conversion of propylene in the catalytic conversion reactor; maintaining in said catalytic conversion reactor an outlet temperature of 500-700° C., a reaction time of 0.5-10 seconds, and a weight ratio of said inhibitor to the hydrocarbon oil feedstock of 0.001-15 wt %; and obtaining a coke deposited catalyst and a product stream containing ethylene and propylene, wherein the step of injecting the inhibitor increases the yield of propylene in the product stream.