Patent ID: 7594995
Filing Date: 2009-09-29
Classification: B01J,C10G

Abstract:
1. A process for the fluidized cracking of a hydrocarbon feedstock having a boiling point above 300° C. at a temperature from 500° C. to 800° C. and a pressure from 103.3 kPa to 6.89×10 3 kPa to produce more than 15% of C 2-4 olefins, and gasoline and diesel cuts as co-products, and having a coke make of less than 18% comprising contacting the feedstock with a catalyst prepared by a process comprising forming a slurry of from 15 to 55 weight % of a matrix component selected from the group consisting of clays, synthetic matrix other than pillared clay, and mixtures thereof and from 10 to 20 weight % of a sol or gel of a binder selected from the group consisting of oxides of aluminum, silicon, and mixtures thereof and from 0 to 15 weight % of an oxide of a grouo IVB or VB metal adding thereto from 10 to 75 weight % of a mixture of one or more zeolites selected from the group consisting of: (i) not less than 10 weight %, based on the total weight of zeolites, of a zeolite having a silica to alumina ratio from 25 to 200 and up to 12 rings in a structural unit which has been treated with less than 0.5 molar alkaline solution at a temperature from 20° C. to 350° C. to reduce the silica to alumina ratio to less than 45, said alkaline treated zeolite having a meso-large pore BET surface area of greater than 50 m (ii) a zeolite having a silica alumina ratio from 10 to 70 and up to 12 rings in a structural unit and a meso large pore size BET surface area less than 40 m (iii) a beta zeolite having a structure in which the silica to aluminum ratio is less than 100; (iv) a Y-faujasite type zeolite having a structure in which silica to alumina ratio is less than 30; the sum of components (i), (ii), (iii) and (iv) adding up to 100 weight % of the zeolite components in said catalysts, wherein one or more of said zeolite components have been subjected to one or more of the following treatments forming particulates of said catalyst having a size from 0.001 to 0.8 mm.