Hydrocarbon cracking process employing zeolite catalysts with hybrid [A1,B]-zeolite additives
AssigneeTexaco Inc.
InventorsHsu-Hui Hsing, Roy E. Pratt, Chih-Hao M. Tsang, Chi-Lin O'Young
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Abstract
A hydrocarbon feedstock is catalytically cracked at an elevated temperature in a cracking zone with a zeolite cracking catalyst. The cracking catalyst employed comprises a crystalline aluminosilicate zeolite catalyst and a hybrid [Al,B]-zeolite catalyst. In this process the hydrocarbon feedstock is contacted with the zeolite catalyst in, for example, a fluidized bed catalytic cracking unit to yield cracked products containing increased amounts of C.sub.3 /C.sub.8 olefins.
Claims18
A process for catalytic cracking hydrocarbons comprising contacting a hydrocarbon feedstock at an elevated temperature in a cracking zone with a catalyst mixture comprising a conventional crystalline aluminosilicate zeolite catalyst and a hybrid [Al,B]-zeolite catalyst, said hybrid [Al,B]-zeolite being prepared by:
- (a) preparing a basic reaction mixture of at least about pH 9 comprising a silicon source, a boron source, an aluminum source and an organic template.
- (b) heating the reaction mixture in a closed vessel under conditions of temperature, autogenous pressure and time effective to produce a crystalline product containing boron and aluminum ions in the framework structure thereof;
- (c) recovering the crystalline product;
- and
- (d) calcining the crystalline product under conditions effective to remove the organic template without substantial damage to the framework structure of the crystalline product.
A process for catalytic cracking hydrocarbons comprising contacting a hydrocarbon feedstock at an elevated temperature in a cracking zone with a catalyst mixture comprising a conventional crystalline aluminositicate zeolite catalyst and a hybrid [Al,B]-zeolite catalyst wherein the catalyst mixture comprises about 0.5 to about 10 wt. % of the hybrid [A,B]-zeolite catalyst with the balance being the conventional crystalline aluminosilicate zeolite catalyst.
Dependencies are inferred from the claim text.