Edward J Powers

US Patent:

42242940, Sep 23, 1980

Filed:

Jan 15, 1979

Appl. No.:

6/003323

Inventors:

Edward J. Powers - Harrison NY

Assignee:

Stauffer Chemical Company - Westport CT

International Classification:

C01B 2530

US Classification:

423309

Abstract:

A mixture of disodium and monosodium orthophosphate in a 2:1 mole ratio is prepared by sequentially reacting phosphoric acid with monohydrate process soda ash and caustic soda in a semi-solid reaction medium. Milled monohydrate process soda ash is contacted in less than stoichiometric proportions with phosphoric acid and the resultant orthophosphate containing reaction mixture is brought to a sodium to phosphorus mole ratio of about 1. 67:1 by subsequent reaction with caustic soda. The final reaction product of mixed disodium and monosodium orthophosphate is suitable feedstock for conversion to sodium tripolyphosphate.