Crystallization of potassium sulfate

Fines Destruction. In the operation of industrial crystallizers, one would usually want to avoid the fines (i.e., small crystals) since they may cause difficulties in downstream processing equipment (e.g., filtration) and affect both product quality and process economics. Excessive fines may also require a relatively long batch run time to achieve the desired final size of the product crystals. Karpinski (1981) proposed a controlled dissolution of secondary nuclei in order to improve CSD from fluidized bed crystallizers. Jones et al. (1984) first described the application of fines destruction in batch crystallization of potassium sulfate solutions. Their study demonstrated the experimental feasibility of this technology to dramatically reduce the amount of fines in the final product CSD. Their theoretical predictions, obtained from population balance models, agreed with the experimental results. 

HjSOi upon gelatin. It is best prepared by acting upon glue with caustic potassa, NH. being liberated HjSOi is then added, and the crystals of potassium sulfate separated the liquid is evaporated, the residue dissolved in alcohol, from w hich solution the glycocol is allowed to crystallize. 

Ethyl sulfhydrate—Thioalcohol—Mercaptan—CHajCHjSH—is -best prepared by treating alcohol with HjSOi, as in the preparation of sulfovinic acid (q.v.) mixing the crude product with excess of potash separating from the crystals of potassium sulfate saturating with HjS and distilling. 

D. Jagadesh, N. Kubota, M. Yokota, N. Doki, and A. Sato. Seeding effect on batch crystallization of potassium sulfate under natural cooling mode and a simple design method of crystallizer. J. Chem. Eng. Jpn. 32 514-520,1999. 

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See also in sourсe #XX -- [ ]

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