Effect of Initial Supersaturation on Mechanism of Purity Drop during Preferential Crystallization

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In order to understand the effect of initial supersaturation on the mechanism of purity drop during preferential crystallization, two sets of experiments were carried out with a threonine-water system. One set was the observation of the {210} faces of L-Thr seed crystals placed in solutions at various supersaturation levels of D-Thr, and the other was preferential crystallization on the basis of the observation results. From the observation, needle-like D-Thr crystals, which nucleated in the bulk solution, were observed in supersaturated DL-Thr solutions at supersaturation of D-Thr (<I>σ</I><SUB>D</SUB>) below 0.19, while thin plate-like D-Thr crystals were found to appear on the {210} faces when <I>σ</I><SUB>D</SUB> was above 0.21. During preferential crystallization for the solution of initial supersaturation of <I>σ</I><SUB>i</SUB> = 0.16, needle-like crystals nucleated in the bulk solution were observed and the bulk nucleation of D-Thr was the mechanism of the purity drop. On the contrary, when the initial supersaturation <I>σ</I><SUB>i</SUB> was 0.21, thin plate-like D-Thr crystals were found to appear by surface nucleation. The surface nucleation of D-Thr was the mechanism of the purity drop. On the basis of observations and preferential crystallization, the mechanisms of the purity drop were concluded to be dependent on the <I>σ</I><SUB>i</SUB> in solutions.

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  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 41(3), 174-181, 2008-03-01 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10021109835
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    9425269
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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