Process for the production of fine granules

Details Process for the production of fine granules Process for the production of fine granules

B - Operations, Transporting

01

J

B01J 2/00 (2006.01) B01J 2/10 (2006.01)

Patent

CA 2120659

Process for the production of fine granules Abstract In a process for the production of fine granules, a product melt (M) from a melt tank (2) is preferably supercooled, and then metered or sprayed into a high-speed mixer (5) and there brought into contact with dry powder, powder mixtures or also with centrifuged and then washed crystallisate (P) from a silo (6). During that operation, granules are formed by crystallisation, which are discharged from the high-speed mixer (5), subsequently dried and/or cooled in a drier (8), for example a moving bed drier or a fluidised bed drier, and then removed from the drier (8). Prior to cooling, the product melt (M) is mixed with a solvent (S), as a result of which its viscosity is greatly reduced and its wetting capacity in respect of the powder, the crystallisate or the powder mixtures (P) is substantially increased. The product melt/solvent mixture is then supercooled preferably to within the metastable range of the solubility curve so that very rapid crystallisation commences in the high-speed mixer (5). During that operation, the temperature of the product melt/- solvent mixture is so regulated that the mixture does not boil at the spray outlet (20) in the high-speed mixer (5). (Fig.)

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