Method for the manufacture of concentrated phosphorous acid

Details Method for the manufacture of concentrated phosphorous acid Method for the manufacture of concentrated phosphorous acid

C - Chemistry, Metallurgy

01

B

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

Patent

CA 2721875

A method for the manufacture of concentrated phosphorous acid starting from pure P4O6 is disclosed. The P4O6 is hydro lysed, preferably under stirring in water in the presence of a homogeneous Broensted acid catalyst while maintaining in the hydrolysis/reaction medium a pH below 5 whereby the free water level, at the completion of the hydrolysis, is in the range from 0 to 40 %.

Linvention concerne un procédé de fabrication dacide phosphoreux concentré à partir de P4O6 pur. Le P4O6 est hydrolysé, de préférence sous agitation dans de leau en présence dun catalyseur acide de Brönsted homogène, tout en maintenant dans le milieu dhydrolyse/de réaction un pH inférieur à 5, le niveau deau libre, à la fin de lhydrolyse, étant dans la plage allant de 0 à 40 %.

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