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題 名 | A Theoretical Model for Phase Transfer Catalyzed Reaction with the Third-Liquid Phase=第三液相相間轉移催化反應之理論模式 |
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作 者 | 楊鴻銘; | 書刊名 | 中國工程學刊 |
卷 期 | 21:4 1998.07[民87.07] |
頁 次 | 頁399-408 |
分類號 | 460.02 |
關鍵詞 | 觸媒; 第三液相; 相間轉移催化反應; Phase transfer catalysis; The third liquid phase; Mass transfer; |
語 文 | 英文(English) |
中文摘要 | 本文以有機液滴之質傳與反應數學模式來探討形成第三液相之相間轉移觸 媒的催化行為,其中第三液相在攪拌狀態下於水相/有機相界面形成包覆於有 機液滴之薄層。活性解媒中間體(qy)在觸媒相之擴散阻力及其在液滴顆粒與 水相之質傳阻力均一併探討,同時定義表面轉化因子(Ψ)與質量Biot數(Bi) 來描述質傳阻力對總反應速率之影響,系統方程式則以有限差分法與四階 Runge-Kutta法解之。由模擬結果顯示,有機相反應物之轉化率隨著Bi數之增 加及Ψ之降低而增加,總反應速率受到有機反應物之擴散係數及其表面反應速 率的影響。至於第三液相中QX與QY之擴散速率對總反應速率之效應則由於 其高度濃縮於觸媒相薄層的特性而顯得相對不重要。 |
英文摘要 | The behaviors of phase transfer catalysts under the formation of a third-liquid phase were analyzed in the present work. A mathematical model concerning mass transfer with reaction in an organic droplet was developed. The third-liquid phase was considered to form between the aqueous/organic interface. The diffusion resistance of active intermediate (QY) in the catalyst phase and mass transfer resistance between the droplet and the bulk aqueous phase were all considered. The surface conversion factor (Ψ) and mass Biot number (Bi) were defined to interpret their relative importance on the overall reaction rate. The system equations were solved by finite difference and fourth-order Runge-Kutta methods. From the simulation results, the conversion increases with increasing Bi and decreases with increasingΨ. The overall reaction rate is influenced not only by the diffusivity of organic reactant but also by its surface reaction rate. In addition, the diffusion rates of QY and QX in the third liquid phase are not important to the overall reaction rate because QY and QX are highly concentrated within the thin catalyst layer. These results exhibit the phenomena of phase transfer reaction catalyzed by the third-liquid phase. |
本系統中英文摘要資訊取自各篇刊載內容。