Process for the synthesis of silicoaluminophosphate...

Details Process for the synthesis of silicoaluminophosphate... Process for the synthesis of silicoaluminophosphate...

2005-01-04

2005-01-04

Stoner, Kiley (Department: 1725)

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

From nonhydrocarbon feed

C585S638000, C585S639000

Reexamination Certificate

active

06838586

ABSTRACT:
The invention is directed to a method for making a silicoaluminophosphate (SAPO) molecular sieve from a reaction mixture comprising components present in amounts sufficient to form the SAPO, the reaction mixture having a first pH. The method comprises the steps of: adding an acid to the reaction mixture after the reaction mixture undergoes a change in pH from the first pH; and crystallizing the SAPO from the reaction mixture. The present invention is also directed to a silicoaluminophosphate molecular sieve made by this process.

REFERENCES:
patent: 4499327 (1985-02-01), Kaiser
patent: 4752651 (1988-06-01), Kaiser
patent: 4943424 (1990-07-01), Miller
patent: 5962762 (1999-10-01), Sun et al.
patent: 6004898 (1999-12-01), Sun
patent: 6040264 (2000-03-01), Sun et al.
patent: 6162415 (2000-12-01), Liu et al.
patent: 6514899 (2003-02-01), Mertens et al.

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