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AssigneeBayer Aktiengesellschaft
InventorsClaus Rathjen, Martin Ullrich
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The product which is present in the form of a melt is cooled and thereby crystallized in a double-shaft worm machine which has self-cleaning worm shafts rotating in the same direction. The crystallizing material is continually crushed in a repeatedly cutting manner during solidification and during the subsequent cooling operation, while maintaining the main transporting direction in the worm. In this manner, crystal agglomerates are prevented from forming which have only solidified on the surface, while still containing liquid portions inside. The process is carried out using a worm machine, the worm profile of which is repeatedly interrupted by introducing grooves, so that only small segment ridges remain.
In a process for the crystallization of melts of chemical products in a double-shaft, coolable worm machine with self-cleaning worm shafts rotating in the same direction, the improvement wherein:
In an apparatus for the crystallization of melts of chemical products having two self-cleaning, tightly threaded, hollow and coolable worm shafts rotatable in the same direction and a coolable housing, the improvement wherein:
Dependencies are inferred from the claim text.