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US 4,846,409 AGranted
Process for the preparation of granules
AssigneeBayer Aktiengesellschaft
InventorsVaclav Kaspar, Manfred Baecker, Horst Brandt, Friedrich Grimmelijkhuizen, Karlheinz Wolf
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Abstract
Low-dust, storage-stable granules are obtained in a continuous operating process in which the powder to be granulated is granulated in succession in a high-speed and low-speed mixing granulator, with the addition of a granulating liquid, and is then dried in a fluidized bed into which a liquid containing a binder is sprayed. The process is particularly suitable for the preparation of dyestuff granules which can easily be dispersed in the use medium.
Claims8
A process for the continuous preparation of granules comprising:
- providing pulverulent material to be granulated,
- granulating the material with a granulating liquid in a high-speed mixing granulator with a shaft rotating at 800-3000 rpm,
- continuously feeding the product obtained from the granulator directly to a slow-speed mixing granulator for subsequent granulation and thereafter
- continuously drying the product in a fluidized bed drier while simultaneously spraying with a forming auxiliary, wherein the amount of granulating liquid added is 10 to 50% by weight in the high speed mixing granulator and 0 to 10% by weight in the slow speed mixing granulator.
1 more element
Dependencies are inferred from the claim text.