FIELD: chemistry.
SUBSTANCE: invention can be used in chemical industry. Concentrated phosphorous acid is obtained by mixing pure P4O6 and reaction medium, containing water and Bronsted acid. In reaction medium pH is supported lower than 5, and content of free water after completion of P4O6 hydrolysis is in the range from 0 to 40%.
EFFECT: claimed invention makes it possible to obtain concentrated phosphorous acid, possessing high degree of purity.
13 cl
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