Preparation of medium density, fast-dissolving, tetrasodium pyro

Details Preparation of medium density, fast-dissolving, tetrasodium pyro Preparation of medium density, fast-dissolving, tetrasodium pyro

1990-05-02

1991-03-05

Langel, Wayne A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 25168

Patent

active

049976346

ABSTRACT:
Process for producing granular tetrasodium pyrophosphate having a bulk density of about 0.73 to about 0.84 g/ml and a dissolving time of about three minutes or less by heating crystalline disodium orthophosphate dihydrate at a slow heating rate, not over about 5.degree. C. per minute, until its temperature reaches about 130.degree. C. and then calcining it at about 350.degree. C. to about 550.degree. C. until it is converted to tetrasodium pyrophosphate.

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patent: 3230044 (1966-01-01), Edwards et al.
patent: 3361523 (1968-01-01), Yu Shen
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patent: 3652205 (1972-03-01), Kern et al.
patent: 3981974 (1976-09-01), Coad et al.
patent: 4873068 (1989-10-01), Hensler

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