METHOD FOR THE MANUFACTURE OF CONCENTRATED PHOSPHORUS ACID

METHOD FOR THE MANUFACTURE OF CONCENTRATED PHOSPHORUS ACID

The invention relates to a method for the manufacture of concentrated phosphorous acid, and particularly to a method for the manufacture of concentrated phosphorous acid starting from pure P4O6 is disclosed. The P4O6 is hydrolysed, preferably under stirring in water in the presence of a homogeneous...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: DEVAUX ALBERT, NOTTE PATRICK
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:The invention relates to a method for the manufacture of concentrated phosphorous acid, and particularly to a method for the manufacture of concentrated phosphorous acid starting from pure P4O6 is disclosed. The P4O6 is hydrolysed, 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%.