Patent ID: 7686942
Filing Date: 2010-03-30
Classification: B01J,C10G

Abstract:
1. A method for preparation of ethylene and propylene by catalytic cracking in a fluid bed, said method uses a fluid-bed catalyst and comprises the steps of: providing a catalyst support, and providing a composition of the following chemical formula based on stoichiometric ratio: selecting A from at least one element of Groups VIII, IB, IIB, VIIB, VIB, IA and IIA; wherein the catalyst support is at least one of a composite molecular sieve, or a mixture of and further comprising the steps of: selecting the composite molecular sieve from least one of ZSM-5, Y, β, MCM-22, SAPO-34 and mordenite, and growing the composite molecular sieve, which is a composite, together from at least two molecular sieves of ZSM-5, Y, β, MCM-22, SAPO-34 and mordenite, and using an amount of the catalyst support from 20 to 80% by weight on the basis of the weight of the catalyst wherein a raw material, naphtha, is reacted with the catalyst at a temperature from 600° C.-650° C., with a load of the catalyst being from 0.5 to 2 g naphtha/g catalyst*h, the weight ratio of water to naphtha being from 1.5 to 3:1, and a reaction pressure being from 0-0.2 MPa.