Preparation of phosphorous acid

Details Preparation of phosphorous acid Preparation of phosphorous acid

1990-03-30

1990-12-25

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423304, 423317, C01B 2516, C01B 2512

Patent

active

049801422

ABSTRACT:
Phosphorous acid is formed by gaseous phase oxidation of phosphorus with water vapour to form predominantly P.sub.2 O.sub.3 and dissolving the P.sub.2 O.sub.3 so-formed in water. The P.sub.2 O.sub.3 also can be recovered as the product by quenching the P.sub.2 O.sub.3 to a stable temperature using an inert cooling medium rather than water. Oxygen also may be used in conjunction with the water vapour. Sufficiently rapid quenching of reaction products may result in the formation of red amorphous phosphorus from unreacted phosphorus.

REFERENCES:
patent: 2613135 (1952-10-01), Shultz
patent: 3532461 (1970-10-01), Roberts et al.

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