A Study of Solute Incorporation into Ice-layer on Freeze Concentration with Ice-lining.

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  • YAMAZAKI YUTAKA
    Fujisawa Manufacture Technology Laboratories, Fujisawa Pharmaceutical Co., Ltd. Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University
  • SHINOZAKI KATSUHIKO
    Fujisawa Manufacture Technology Laboratories, Fujisawa Pharmaceutical Co., Ltd.
  • HIRATA YUSHI
    Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University

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  • アイスライニング凍結濃縮法における氷晶層中への溶質取り込みに関する研究
  • アイスライニング トウケツ ノウシュクホウ ニ オケル ヒョウショウソウ チュ

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Abstract

The mechanism of solute incorporation into an ice-layer in freeze concentration with ice-lining was studied by changing the impeller speed N and the difference between the brine temperature and the freezing point of the feed solution ΔT in 10 kg/m3 CCNa solution. The effect of N on the apparent partition coefficient of the solute K, is more serious than that of ΔT. The growth rate of the ice layer is 10-710-6 m/s under the condition of ΔT = 2.87.9°C and N = 20400 min-1. The growth rate had a little effect on solute incorporation into the ice-layer. K values depended on the surface condition of the ice layer, which is effected by the mixing speed of the impeller. The ice layer formed at low mixing speed has a complex rough shape, and has much solute because of adhesion to a large surface area. Therefore, it is recommended that freeze concentration is performed by making an ice layer with smooth surface at high mixing speed.

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