Process for making aqueous alkali metal phosphate solutions

Details Process for making aqueous alkali metal phosphate solutions Process for making aqueous alkali metal phosphate solutions

1981-11-30

1983-05-24

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423305, 423307, 423308, C01B 1516, C01B 2526

Patent

active

043850413

ABSTRACT:
The invention relates to a process for making aqueous alkali metal phosphate solutions by subjecting aqueous alkali metal phosphite solutions to catalytic oxidation with oxygen or air. More particularly, oxygen or air in stoichiometric excess proportions is introduced into the aqueous alkali metal phosphite solution at about 30.degree. to 110.degree. C., at a pH-value of 0 to about 8, and in the presence of SiO.sub.2 or aluminum silicate containing at most 10 weight % Al.sub.2 O.sub.3, for as long as necessary to achieve conversion of the alkali metal phosphite to alkai metal phosphate. After completion of the oxidation, the aqueous solution is separated from the catalyst.

REFERENCES:
patent: 4278647 (1981-07-01), Jodden et al.
Gmelim, Hanbuch der Anorganischen Chemie, 8 ed., vol. Phosphorus, Part C, 1965, p. 129.

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