Preparation of sodium orthophosphate mixtures

Details Preparation of sodium orthophosphate mixtures Preparation of sodium orthophosphate mixtures

1979-01-15

1980-09-23

Langel, Wayne A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423315, C01B 2530

Patent

active

042242940

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.

REFERENCES:
patent: 3081151 (1963-03-01), Marty
patent: 3086844 (1963-04-01), Beltz et al.
patent: 3409392 (1968-11-01), Shaver
patent: 3764655 (1973-10-01), Ehlers et al.
patent: 4112118 (1978-09-01), Cussons et al.
Hou, Manufacture of Soda, Second Edition, Reinhold Publishing Corp., (1942), p. 182.
Babor, Basic College Chemistry, Second Edition, Thomas Y. Crowell Co., (1953), pp. 255-257.

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