Process and plant for the preparation of ammonium polyphosphate

C - Chemistry – Metallurgy – 01 – B

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C01B 25/28 (2006.01) C01B 25/40 (2006.01)

Patent

CA 2046841

HOE 90/H 021 Process and plant for the preparation of ammonium polyphosphate Abstract of the disclosure: To prepare essentially water-insoluble, chain-form ammonium polyphosphate from equimolar amounts of di- ammonium phosphate and phosphorus pentoxide in the presence of ammonia at temperatures of from 170 to 350°C with constant mixing, kneading and comminution, at least some of the diammonium phosphate and phosphorus pentoxide is replaced by partially ammoniated polyphosphoric acid. A plant for carrying out this process can comprise a sealed reactor (l) which is provided with metering devices (2, 3) and feed tubes (4, 5) for phosphorus pentoxide and diammonium orthophosphate, an ammonia feed tube (8), an ammonium polyphosphate discharge tube (9) and a line for offgas. Rotatable mixing r kneading and comminution elements are provided inside the reactor (1). Furthermore, a heatable stirred tank (11) which can be charged with polyphosphoric acid via a feed line (13) is provided and can be used to remove water vapor and ammonia from the offgas flowing from the reactor (1) via the line (20) and from which partially ammoniated poly- phosphoric acid can be introduced into the reactor (1) via an outlet line (17).

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