B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
18/768
B01J 2/20 (2006.01) B01D 9/00 (2006.01)
Patent
CA 1178010
A PROCESS FOR THE PRODUCTION OF GRANULATES OF ORGANIC SUBSTANCES PRESENT IN THE FORM OF A MELT ABSTRACT OF THE DISCLOSURE The organic substance present in the form of a melt is cooled below its solidification point in a twin-screw extruder so that it crystallises out. The crystallised material is then extruded through a breaker plate at the end of the screw extruder and further cooled. It is essential that the tempe- rature prevailing in the screw extruder, its rotational speed and the temperature of the breaker plate should be adjusted such that from 70 % to 99.5 % and preferably from 95 to 99.5 % of the material has solidified by the time it reaches the end of the screw, the non-crystallised liquid residue only crystallising out during the subsequent cooling operation. Accordingly, a small residue of melt is present during extrusion through the breaker plate. In addition, extrusion is facilitated if the breaker plate is kept at a temperature in the vicinity of the melting point of the material in question. Le A 20 770
392880
Muller Ernst-Willi
Rathjen Claus
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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