塩化ナトリウム2水和物の生成におよぼす添加物の影響  [in Japanese] Effect of Additives on Precipitation of Sodium Chloride Dihydrate  [in Japanese]

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Author(s)

    • 党 弘之 TO Hiroyuki
    • 財団法人塩事業センター海水総合研究所 Sea Water Science Research Laboratory, The Salt Industry Center of Japan

Abstract

添加物による塩化ナトリウム2水和物の生成抑制メカニズムを明らかにし, 低温固結防止法を確立するために試験を実施し, 次の結果を得た.<BR>1) 塩化ナトリウム溶解度は, 添加物濃度の上昇とともに減少し, その効果は水和エンタルピーが大きいほど大きかった.<BR>2) 塩化ナトリウム2水和物生成量は, 温度が-5℃以下に低下すると急激に増加した.<BR>3) 塩化ナトリウム2水和物生成量は, 添加物濃度の上昇とともに減少し, その効果は水和エンタルピーが大きいほど大きかった.<BR>4) ナトリウムイオンよりも水和エンタルピーの大きい添加物によって低温固結を防止することができ, その効果は水和エンタルピーが大きなものほど大きかった.

We have stadied the inhibitive properties of sodium chloride dihydrate precipitation and established a preventive method for caking at freezing temperature using these additives.<BR>1) The solubility of sodium chloride decreased in proportion to the increase in concentration of the additives. This effect was significant since the hydration enthalpy also increased.<BR>2) Sodium chloride dihydrate precipitates increased in proportion to the decrease in temperature. In particular, it showed a rapid rate of increase below -5°C.<BR>3) Sodium chloride dihydrate precipitates decreased in proportion to the increase in concentration of the additives. This effect was significant since the hydration enthalpy also increased.<BR>4) Caking at freezing temperature was prevented by the additives whose hydration enthalpy was greater than that of the sodium ion. This effect was significant since the hydration enthalpy also increased.

Journal

  • Bulletin of the Society of Sea Water Science, Japan

    Bulletin of the Society of Sea Water Science, Japan 50(5), 356-362, 1996-10

    The Society of Sea Water Science, Japan

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Codes

  • NII Article ID (NAID)
    10008280186
  • NII NACSIS-CAT ID (NCID)
    AN0018645X
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    03694550
  • NDL Article ID
    4045616
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山) // ZP8(科学技術--化学・化学工業--無機化学・無機化学工業)
  • NDL Call No.
    Z15-47
  • Data Source
    CJP  NDL  J-STAGE 
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