Soluble acid polyphosphates and device for their production

Details Soluble acid polyphosphates and device for their production Soluble acid polyphosphates and device for their production

C - Chemistry, Metallurgy

01

B

C01B 25/41 (2006.01) A23C 19/082 (2006.01)

Patent

CA 2295687

The invention relates to a method for producing soluble acid polyphosphates with an Na/P ratio of 0.3 to 0.6, a P2O5 content of over 77 %wt., a Na2O content of under 20 % and a residual water content of 3-10 %. The invention is characterized in that an aqueous phosphate solution is dried in order to form chain-like polyphosphates with an average chain length of 10 to 30, and then fused for 30-180 minutes at temperatures of 400-600 ~C. The fusion is cooled, forming a vitreous product. During fusion, steam pressure of 0.1 to 0.5 bar is maintained in the atmosphere in contact with the fusion. The invention also relates to the polyphosphates produced by this method and to their use.

L'invention concerne un procédé de fabrication de polyphosphates acides solubles de rapport Na/P de 0,3 à 0,6, ayant une teneur en P¿2?O¿5? supérieure à 77 % en poids, une teneur en Na¿2?O inférieure à 20 % et une teneur en eau résiduelle de 3 à 10 %, caractérisé en ce qu'on sèche une solution aqueuse de phosphate en vue de former des polyphosphates en chaînes, de longueur de chaînes moyenne comprise entre 10 et 30, on effectue la fusion à des températures de 400 à 600 ·C pendant 30 à 180 minutes et on refroidit le composé fondu, ce qui donne lieu à la formation d'un produit vitreux, et en ce qu'on maintient, pendant la fusion, une pression de vapeur d'eau dans l'atmosphère en contact avec le composé fondu, comprise entre 0,1 et 0,5 bar. L'invention concerne également les polyphosphates fabriqués suivant ce procédé, ainsi que leur utilisation.

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