公开(公告)号：DE4024240A1

公开(公告)日：1992-02-06

申请号：DE4024240

申请日：1990-07-31

Applicant: HOECHST AG

Inventor： STAFFEL THOMAS DR ,  ADRIAN RENATE DIPL ING ,  BECKER WOLFGANG DIPL ING

IPC: C01B25/40

Abstract: To produce essentially water-insoluble, chain-form ammonium polyphosphate from equimolar amounts of diammonium phosphate and phosphorus pentoxide in the presence of ammonia at temperatures of 170 to 350 DEG C with continuous mixing, kneading and comminution, diammonium phosphate and phosphorus pentoxide are at least partly replaced by partially ammoniated polyphosphoric acid. An installation for carrying out this process can be composed of a sealed reactor (1), 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 also with a pipe for waste gas. In the interior of the reactor (1), rotatable mixing, kneading and comminution tools are mounted. Furthermore, a heatable stirrer container (11), into which polyphosphoric acid can be passed via a feed pipe (13), is provided, with the aid of which steam and ammonia can be eliminated from the waste gas flowing to the reactor (1) via the pipe (20) and from which partially ammoniated polyphosphoric acid may be introduced into the reactor (1) via an outlet pipe (17).

公开(公告)号：DE4032133A1

公开(公告)日：1992-04-16

申请号：DE4032133

申请日：1990-10-10

Applicant: HOECHST AG

Inventor： STAFFEL THOMAS DR ,  GRADL REINHARD DIPL CHEM DR ,  BECKER WOLFGANG DIPL ING ,  FUCKER GREGOR

IPC: C01B25/40

Abstract: To prepare substantially water-insoluble, chain-type ammonium polyphosphate, equimolar quantities of diammonium phosphate and phosphorus pentoxide are reacted at temperatures from 170 to 350 DEG C in the presence of a stream of ammonia gas in a zone which effects continuous mixing, kneading and comminution. The water is separated from the water vapour-containing ammonia gas leaving the zone and the dried ammonia gas is allowed to flow again through the zone. … An installation for the preparation of substantially water-insoluble, chain-type ammonium polyphosphate can consist of a reactor (1) into which lead an ammonia feed pipe (8) and pipes for feeding phosphorus pentoxide (6) and diammonium phosphate (7) and from which start an ammonium polyphosphate discharge pipe (9) and an exit gas pipe (10). The exit gas pipe (10) leads into a cooler (13) which is flow-connected via a pump (14) to a heat exchanger (15), from which an exit gas line (18) starts which leads into the ammonia feed pipe (8). … …

公开(公告)号：DE4133811A1

公开(公告)日：1993-04-15

申请号：DE4133811

申请日：1991-10-12

Applicant: HOECHST AG

Inventor： STAFFEL THOMAS DR ,  BECKER WOLFGANG DIPL ING ,  NEUMANN HERBERT DIPL ING

IPC: C01B25/40