C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
8/47
C09B 67/06 (2006.01) B01J 2/00 (2006.01) C09B 67/00 (2006.01)
Patent
CA 1278151
METHOD FOR IMPROVING STRENGTH OF DRY DYE PARTICLES AND REDUCING EXPLOSION HAZARDS Abstract of the Disclosure 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 fires are removed during the drying stage in the exit air steam 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.
519707
Hinson James W.
Roe Diane H.
Ciba-Geigy Investments Ltd.
Fetherstonhaugh & Co.
Hinson James W.
Roe Diane H.
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