Preparation of sodium tripolyphosphate

Details Preparation of sodium tripolyphosphate Preparation of sodium tripolyphosphate

1977-11-03

1979-03-27

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423309, 423313, 423321R, C01B 1516, C01B 2526, C01B 2516

Patent

active

041465750

ABSTRACT:
The purity grade of sodium tripolyphosphate obtained by neutralization with sodium hydroxide of aqueous phosphoric acid obtained by the wet method, removal of the precipitate formed, evaporation to dryness of the resulting solution and calcination of the evaporation residue, is improved by carrying out the neutralization at a temperature not exceeding 85.degree. C., maturing the neutralization product at 70.degree.-85.degree. C. for at least one hour before separating the precipitate, concentrating the sodium phosphate solution, if necessary, to a sodium phosphate content of at least 40 wt.%, and heat treating the solution at 100.degree.-200.degree. C. and at boiling point or under to precipitate the magnesium compounds, prior to the evaporation step.

REFERENCES:
patent: 1825965 (1931-10-01), Lang
patent: 1998182 (1935-04-01), Anable et al.
patent: 3081151 (1963-03-01), Marty
patent: 3421845 (1969-01-01), Peterson
patent: 3423170 (1969-01-01), Edwards

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