Method of preparing a molecular sieve composition

Details Method of preparing a molecular sieve composition Method of preparing a molecular sieve composition

2007-01-26

2010-11-09

Brunsman, David M (Department: 1793)

Chemistry of inorganic compounds

Zeolite

C423S702000, C423S706000

Reexamination Certificate

active

07829062

ABSTRACT:
A method of preparing a crystalline molecular sieve is provided, which method comprises(a) providing a reaction mixture comprising at least one source of ions of tetravalent element Y, at least one source of alkali metal hydroxide, water, optionally at least one seed crystal, and optionally at least one source of ions of trivalent element X, said reaction mixture having the following mole composition:Y:X2=10 to infinityOH−:Y =0.001 to 2M+:Y =0.001 to 2wherein M is an alkali metal and the amount of water is at least sufficient to permit extrusion of said reaction mixture;(b) extruding said reaction mixture to form a pre-formed extrudate; and(c) crystallizing said pre-formed extrudate under vapor phase conditions in a reactor to form said crystalline molecular sieve whereby excess alkali metal hydroxide is removed from the pre-formed extrudate during crystallization. The crystalline molecular sieve product is useful as catalyst in hydrocarbon conversion processes.

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