Production of aluminum polyphosphate

Details Production of aluminum polyphosphate Production of aluminum polyphosphate

1977-05-09

1979-04-03

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423305, C01B 1516, C01B 2526

Patent

active

041477588

ABSTRACT:
Aluminum polyphosphate is made. To this end, solid aluminum hydroxide and polyphosphoric acid which are used in proportions corresponding to an Al:P molar ratio of 1:2.5 to 1:3.5, are introduced separately from, but concurrently with, one another into a reaction zone kept at 150.degree. to 200.degree. C. A moist friable consistency of the starting materials is maintained in the reaction zone by continuously mixing, kneading and comminuting them over substantially the entire period during which they are introduced into the reaction zone. The reaction is continued until a dry sandy powder is formed; and the powder is annealed at 400.degree. to 600.degree. C. over a period sufficient to yield a product undergoing a 0.5 to 1% weight loss on ignition.

REFERENCES:
patent: 1654404 (1927-12-01), Blumenberg
patent: 3394987 (1968-07-01), Lee et al.
patent: 3650683 (1972-03-01), Hloch et al.
patent: 3801704 (1974-04-01), Kobayashi et al.
patent: 3943231 (1976-03-01), Wasel-Nielen et al.

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