Patent ID: 8298300

Claim:
Continuous process for preparing large crystal products of a crystalline product in a fluid bed crystallizer, said fluid bed crystallizer comprising a crystallization vessel and means for mechanically impacting of crystals; and connected to the crystallization vessel (i) a feed line; (ii) an external circulation circuit comprising means for determining the properties of the slurry in the external circulation circuit and a heat exchanger; and (iii) a product withdrawal line, said process being characterized in that, for any specific crystalline product and at any flow rate chosen in the external circulation circuit, the weight percentage of crystals of the crystalline product in the slurry in the external circulation circuit, ECCWPC, before the heat exchanger, is controlled by said means for determining properties of the slurry within a specified and predetermined narrow range having a maximum and minimum value not more apart than at most 25% by weight and falling within the range of from 1 to 50% by weight.