Process and apparatus for preparation of phosphorus oxyacids...

C - Chemistry – Metallurgy – 01 – B

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C01B 25/20 (2006.01) B01J 8/00 (2006.01) B01J 19/18 (2006.01) B01J 19/24 (2006.01) C01B 25/16 (2006.01) C07F 9/38 (2006.01)

Patent

CA 2322740

A process for the preparation of an oxyacid of phosphorus comprising contacting elemental phosphorus with water in the presence of a catalyst effective to promote oxidation of phosphorus by reaction with water. The use of a noble metal catalyst such as Pd under moderate agitation and low severity conditions is effective for the preparation of P(III) oxyacid in high selectivity. Other platinum metals, and oxides, salts, phosphides and coordination compounds of platinum metals, Group IB metals and Group VIII metals, may also be used as catalysts. Various apparatus and process schemes for the preparation of phosphoric and phosphorous acid are also disclosed.

L'invention concerne un procédé de préparation d'un oxyacide de phosphore consistant à mettre en contact du phosphore élémentaire et de l'eau, en présence d'un catalyseur efficace pour induire l'oxydation du phosphore par réaction avec l'eau. L'utilisation d'un catalyseur de métal noble, tel que du palladium, dans des conditions d'agitation modérée et de sévérité réactionnelle faible, se révèle efficace dans la préparation d'un oxyacide de P(III), à grande sélectivité. On peut utiliser également en tant que catalyseurs d'autres métaux à base de platine, et des oxydes, sels, phosphures et composés de coordination de métaux à base de platine, de métaux du groupe IB et du groupe VIII. L'invention concerne aussi divers dispositifs et procédés de réalisation, servant à la préparation d'acide phosphorique et phosphoreux.

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