Patent ID: 6713658
Filing Date: 2004-03-30
Classification: B01J,C10G

Abstract:
A process for the catalytic cracking of olefins in a hydrocarbon feedstock which is selective towards light olefins in the effluent, the process compromising contacting a hydrocarbon feedstock containing olefins having a first composition of at least one olefinic component with a MFI crystalline silicate catalyst having a silicon/aluminum atomic ratio of from 180 to 1000, to produce an effuent having a second composition of at least one olefinic component, with the feedstock and the effluent having substantially the same olefin content by weight therein, the catalyst having been produced by heating the catalyst in steam to remove aluminum from a crystalline silicate framework of the catalyst and extracting aluminum from the catalyst by contacting the catalyst with a complexing agent for aluminum to remove, from pores of the framework, aluminum deposited therein during the steaming step, thereby to increase the silicon/aluminum atomic ratio of the catalyst, and calcining the catalyst at elevated temperature.