Preparation of phosphorous acid
AssigneeTenneco Canada Inc.
InventorsJames D. McGilvery, Helena Twardowska, Slawomir M. Cybulski
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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.
Claims20
A process for forming phosphorous acid, which comprises oxidizing phosphorus in the gaseous phase with water vapour predominately to P.sub.2 O.sub.3 at a temperature of about 1000.degree. to about 2500.degree. K., and dissolving the .sub.2 O.sub.3 so-formed in an agueous medium.
A process for forming phosphorus trioxide, which comprises oxidizing phosphorus in the gaseous phase with water vapor predominantly to P.sub.2 O.sub.3 at a temperature of about 1000.degree. to about 2500.degree. K., and rapidly cooling said P.sub.2 O.sub.3 to a temperature at which said P.sub.2 O.sub.3 may be recovered as a stable phase.
Dependencies are inferred from the claim text.