Process for the production of substantially water-insoluble line

Details Process for the production of substantially water-insoluble line Process for the production of substantially water-insoluble line

1974-06-03

1976-08-31

Thomas, Earl C.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

71 43, 423312, C01B 1516, C01B 2526

Patent

active

039781950

ABSTRACT:
Production of substantially water-insoluble linear ammonium polyphosphates of the general formula (NH.sub.4 PO.sub.3).sub.n, in which n is a number between 10 and 1000. To this end, substantially equimolecular proportions of ammonium orthophosphate and phosphorus pentoxide are reacted by heating them to temperatures within the range 170.degree. and 350.degree.C in the presence of gaseous ammonia. The reaction is effected while continuously and simultaneously mixing, kneading and comminuting the reaction material in a reactor. The reactor is closed, provided with means for the supply of solid feed material, a gas inlet and a gas outlet, a discharge opening for the removal of final product, and with mixing, kneading and comminuting implements which are rotatably secured to the inside of the reactor.

REFERENCES:
patent: 3503706 (1970-03-01), Legal
patent: 3653821 (1972-04-01), Heymer et al.

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