Acetic Acid Process Catalyzed by Ionically Immobilized Rhodium Complex to Solid Resin Support

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The concept to immobilize homogeneous catalyst to a solid support has received considerable attention, as it simplifies the separation of catalyst from products and also it solves the loss of expensive metal complexes such as rhodium in the separation area.<BR>Since a rhodium carbonyl iodide complex as a methanol carbonylation catalyst is an anion, the ionic bond immobilization to a pyridinium cation resin support was studied. Virtually all rhodium was immobilized, because the ion exchange equilibrium is understood to favor extremely the pyridinium cation resin. The reaction mechanism was exactly the same as that by homogeneous catalyst and the activity per rhodium was rather increased equivalent to that promoted by addition of iodide additives under low water condition. Therefore, the rhodium complex anion is ionically immobilized as the same formula in the liquid phase and also promoted with surrounding pyridinium iodide back bones. Reaction time or catalyst concentration did not directly affect the rhodium leaching, but the water concentration of the product controlled the rhodium leaching through iodide anions to be exchanged with rhodium complex anions.<BR>The catalyst stability for 2,000 hours operation was confirmed using CSTR and no rhodium leaching was demonstrated with 0.3 wt-ppm of co-feed of equilibrium rhodium concentration.

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  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 37(4), 536-545, 2004-04-01

    公益社団法人 化学工学会

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各種コード

  • NII論文ID(NAID)
    10013340161
  • 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
    6929650
  • 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  NDL  J-STAGE 
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