Method for improving strength of dry dye particles and reducing

Details Method for improving strength of dry dye particles and reducing Method for improving strength of dry dye particles and reducing

1985-10-04

1987-05-12

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 12, 241 17, F26B 308

Patent

active

046638598

ABSTRACT:
A process for preparing dry dye granules is disclosed. The process involves the preparation of a controlled moisture content slurry of the dye. Then introducing the slurry into a turbogranulator to form solid spherical particles whose size is controlled by the moisture content of the slurry. Then drying the particles in a fluidized bed dryer by heated air. Most of the fines are removed during the drying stage in the exit air stream from the dryer. The remaining fines and over sized particles are recovered on screening and are combined and ground and used to control the moisture content of the initial slurry. The final solid granules have good strength as compared to the previously marketed spray-dried materials which were in the form of porous hollow spheres. They are more readily dispersible and more rapidly dissolving.

REFERENCES:
patent: 3748745 (1973-07-01), Sachs et al.
patent: 3879855 (1975-04-01), Weiser et al.
patent: 4327998 (1982-05-01), Sandefur et al.

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