Process and plant for producing ammonium polyphosphate

Details Process and plant for producing ammonium polyphosphate Process and plant for producing ammonium polyphosphate

C - Chemistry, Metallurgy

01

B

C01B 25/28 (2006.01) B01J 10/00 (2006.01) C01B 25/40 (2006.01)

Patent

CA 2051857

HOE 90/H 031 Process and plant for producing ammonium polyphosphate Abstract of the disclosure For producing substantially water-insoluble, chain-type ammonium polyphosphate, equimolar quantities of diammo- nium phosphate and phosphorus pentoxide are reacted at temperatures from 170 to 350°C in a zone, which effects continuous mixing, kneading and comminution, in the presence of a stream of ammonia gas. In this process, the water is separated from the ammonia gas which leaves the zone and contains water vapor, and the dried ammonia gas is caused to flow again through the zone. A plant for producing substantially water-insoluble, chain-type ammonium polyphosphate can comprise a reactor (1) into which an ammonia feed pipe (8) and pipes for feeding phosphorus pentoxide (6) and diammonium phosphate (7) lead and from which an ammonium polyphosphate dis- charge pipe (9) and an exit gas pipe (10) start. The exit gas pipe (10) leads into a condenser (13) which is flow- connected via a pump (14) to a heat exchanger (15) An exit gas line (18) which leads into the ammonia feed pipe (8) starts from the heat exchanger (15).

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