PURIFICATION BY SWEATING OF ORGANIC SOLID SOLUTIONS BY LAYER AND SUSPENSION TYPE MELT CRYSTALLIZATION OPERATIONS

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著者

    • MATSUOKA Masakuni
    • Department of Chemical Engineering, Tokyo University of Agriculture and Technology(TUAT)
    • FUKUDA Toshihiko
    • Department of Chemical Engineering, Tokyo University of Agriculture and Technology(TUAT)
    • TAKAGI Yoshiki
    • Department of Chemical Engineering, Tokyo University of Agriculture and Technology(TUAT)
    • TAKIYAMA Hiroshi
    • Department of Chemical Engineering, Tokyo University of Agriculture and Technology(TUAT)

抄録

In order to provide a quantitative basis to discuss the efficiency of purification of organic mixtures achieved by layer or suspension type melt crystallization operations, experiments of purification by sweating were carried out with naphthalene-benzothiophene solid solution mixtures. The rate and the degree of composition changes were analyzed for crude crystals prepared either as a layer on a cold surface or as a suspension in a supercooled melt. The purification by sweating was conducted at constant temperatures (isothermal sweating) and the rate of composition change was evaluated by the purification rate coefficient <I>k<SUB>p</SUB></I>, which was defined as the ratio of the purification rate to the excess amount of the impurity in the crude crystal phase. The values of the purification rate coefficient for the layer type were found to be always lower than those for the suspension type, while the amount of impurities unable to be removed by sweating from the layer was larger than that for the suspension crystals. Consequently, it is concluded that purification by isothermal sweating in terms of the rate and the attainable purity was higher for the suspension type than the layer one in the present experiments. These results and the significance of the purification rate coefficient were discussed quantitatively.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 28(5), 562-569, 1995-10 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10002134447
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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