PROCESS FOR CRYSTALLIZATION IN A DRAFT TUBE BAFFLE CRYSTALLIZER

摘要

In a continuous crystallization process employing an evaporative draft tube baffle (DTB) crystallizer apparatus to produce crystal product, the improvement which is feeding at constant rate to the body of slurry a suspension of crystals in a solution at a temperature no greater than the operating temperature of the DTB crystallizer vessel, said suspension of crystals comprising solute and 6 to 24 % by volume, based on total volume of the suspension, of crystals with at least 35 % of the crystals larger than 14 mesh (1.2 mm) in size, in an amount whereby the weight of crystals is 4 to 25 percent of the weight of the product withdrawn, whereby cycling in the particle size distribution of the product withdrawn is reduced and rate of production of granular size crystals is increased.