Production of phosphorous acid

Details Production of phosphorous acid Production of phosphorous acid

C - Chemistry, Metallurgy

01

B

23/71

C01B 25/163 (2006.01)

Patent

CA 1120688

PRODUCTION OF PHOSPHOROUS ACID ABSTRACT OF THE DISCLOSURE: The invention relates to a process for making aqueous phosphorous acid solutions by admixing an aqueous sodium phosphite solution with hydrochloric acid. More specifi- cally, phosphorous acid solutions substantially free from sodium in hydrochloric acid are produced by introducing hydrogen chloride into the sodium phosphite solution un- til the latter is saturated therewith and separating pre- cipitating sodium chloride from the resulting phosphorous acid solution in hydrochloric acid.

331431

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