Continuous process for preparing sodium orthophosphate slurries

Details Continuous process for preparing sodium orthophosphate slurries Continuous process for preparing sodium orthophosphate slurries

1988-03-21

1989-08-01

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423313, 423315, C01B 2530

Patent

active

048532002

ABSTRACT:
Unmilled commercially available granular "natural" soda ash is reacted with orthophosphoric acid to produce a highly concentrated slurry at a molar Na:P ratio of about 1.5 in a continuous process. Problems associated with incomplete reaction are solved and the slurry can be dried to the double salt Na.sub.3 H.sub.3 (PO.sub.4).sub.2 or reacted with aqueous sodium hydroxide to produce a superior precursor for manufacturing sodium tripolyphosphate.

REFERENCES:
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patent: 3409392 (1968-11-01), Shaver
patent: 3441374 (1969-04-01), Shen
patent: 3591334 (1971-07-01), Hudson et al.
patent: 4224294 (1980-09-01), Powers
patent: 4299803 (1981-11-01), Schrodter et al.
patent: 4661331 (1987-04-01), Stahlheber et al.

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