The Continuous Crystallization of Aluminum Potassium Sulphate in an Agitated Vessel.

摘要

A continuous flow, mixed-suspension, mixed-product-removal crystallizer was constructed. The apparatus was shown to satisfy the assumptions necessary for the calculation of crystal sizes produced under various operating conditions. Although the growth velocities were of the same order-of-magnitude as those observed in single crystal studies, the crystallization kinetics obtained for the growth of potassium alum in this suspension crystallizer differed. Solution trapping due to occlusion formation during crystal growth was also investigated. Previous workers have found significant amounts of trapped solvent at various growth velocities in single crystals grown in flow crystallizers. Although some of these same growth velocities were attained in this study, no conclusive evidence of solution trapping was noted in the crystals grown in the suspension crystallizer. Several reasons for this discrepancy are also postulated. (Author)