Determination of Critical Seed Loading Ratio for the Production of Crystals of Uni-Modal Size Distribution in Batch Cooling Crystallization of Potassium Alum
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概要
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Batch cooling crystallization of potassium alum in aqueous solution was conducted over a wide range of seed loading with various average seed sizes under the natural cooling condition. A solution of a low saturation temperature was used. In this dilute solution the supersaturation during crystallization did not become high so that agglomeration of the original seeds was avoided even for small seeds. The critical seed loading ratio Cs*, the critical value of the ratio of seed mass to the theoretical crystal yield, above which loading seed crystals were grown with no secondary nucleation, was determined. It was correlated as a second order equation of mean mass size Ls [μm], as Cs* = 2.17 × 10–6Ls2. The value of Cs* was confirmed, by comparing with previous data published by the present authors, not to change significantly with crystallizer volume, stirrer speed, the saturation temperature of the solution (i.e., the solution concentration) and the cooling mode. This correlation is shown to be conveniently used to determine the seed amount satisfying an optimal seeding condition of Cs ≥ Cs* for a given seed size. The mean mass size of product crystals and the volume of a crystallizer required for a desired production is easily determined for this optimal seed loading condition by the aid of a simple mass balance.
- 社団法人 化学工学会の論文
- 2002-07-01
著者
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DOKI Norihito
Department of Chemical Engineering, Iwate University
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Doki Norihito
Department Of Chemical Engineering Iwate University
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Yokota M
Department Of Chemical Engineering Iwate University
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Kubota Noriaki
Department Of Chemical Engineering Iwate University
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Kubota Noriaki
Department Of Applied Chemistry And Molecular Science Iwate University
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YOKOTA Masaaki
Department of Chemical Engineering, Iwate University
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CHIANESE Angelo
Department of Chemical Engineering, The University of Rome
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Yokota Masaaki
Department Of Chemical Engineering Iwate University
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Chianese Angelo
Department Of Chemical Engineering The University Of Rome
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Yokota Masaaki
Department Of Applied Chemistry And Materials Science Iwate University
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