Method of producing ammonium polyphosphate

Details Method of producing ammonium polyphosphate Method of producing ammonium polyphosphate

1975-06-27

1977-03-08

Vertiz, Oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423310, 71 43, 423305, C01B 1516, C01B 2526

Patent

active

040113000

ABSTRACT:
Phosphoric acids having H.sub.2 0/P.sub.2 O.sub.5 mole ratios of about 4.5 or less are converted to aqueous solutions of ammonium polyphosphates of which at least about 40 percent of the P.sub.2 O.sub.5 is present as acyclic polyphosphates. The reaction is conducted at 500.degree. to about 750.degree. F. sufficient to increase the polymeric P.sub.2 O.sub.5 content at least 10 percent by reacting a highly dispersed, unconfined acid spray with substantially anhydrous ammonia. High conversions to polymeric species are obtained while minimizing both reactor fouling when using impure wet-process acids, and corrosion occurring with either wet-process or "white" acids.

REFERENCES:
patent: 1869688 (1932-08-01), Heimann
patent: 1971563 (1934-08-01), Hirschkind et al.
patent: 3464808 (1969-09-01), Kearns

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