Method for the continuous preparation of stable aqueous ammonium

Details Method for the continuous preparation of stable aqueous ammonium Method for the continuous preparation of stable aqueous ammonium

1973-12-21

1976-04-13

Vertiz, Oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

71 43, C01B 1516, C01B 2526

Patent

active

039504956

ABSTRACT:
An improved method for the continuous production of stable aqueous ammonium polyphosphate compositions which are useful as fertilizers and fire retardants. Wet-process superphosphoric acid which is primarily in the orthophosphate form and anhydrous ammonia vapor are combined in a pipe reactor wherein the exothermic ammoniation of the acid and the conversion of a portion of the orthophosphate to polyphosphate caused by the heat liberated in the exothermic ammoniation reaction occur. A stream of the acid is introduced into the interior of a stream of ammonia vapor in the pipe reactor in order to avoid corrosion of the pipe reactor.
Water is added to the reaction mixture to quench the conversion reaction and to provide the amount of water that is required in the desired final composition. The resulting stream is combined with a cooler stream of the desired final stable aqueous ammonium polyphosphate wherein the polyphosphate is cooled and the ammoniation is completed rapidly.

REFERENCES:
patent: 3044851 (1962-07-01), Young
patent: 3459499 (1969-08-01), Mullen
patent: 3464808 (1969-09-01), Kearns
patent: 3503706 (1970-03-01), Legal
patent: 3695835 (1972-10-01), Kearns
patent: 3730700 (1973-05-01), Groenveld
patent: 3733191 (1973-05-01), Meline et al.
patent: 3734708 (1973-05-01), Burns
patent: 3775534 (1973-11-01), Meline
Pipe Reactor in Production of Liquid with Very High Polyphosphate Content Fortelzsibleutons 1972.

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