Preparation of phosphorous acid

Details Preparation of phosphorous acid Preparation of phosphorous acid

C - Chemistry, Metallurgy

01

B

23/324, 23/60, 2

C01B 25/023 (2006.01) C01B 25/12 (2006.01) C01B 25/163 (2006.01)

Patent

CA 2013221

Phosphorous acid is formed by gaseous phase oxidation of phosphorus with water vapour to form predominantly P2O3 and dissolving the P2O3 so-formed in water. The P2O3 also can be recovered as the product by quenching the P2O3 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.

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