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題名 | 以Langmuir等溫式解析共流與逆流多級吸附程序之研究=An Analysis of Cocurrent and Countercurrent Multi-Stage Adsorption with a Langmuir Isotherm |
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作者 | 曾如玲; 吳豐智; | 書刊名 | 技術學刊 |
卷期 | 12:3 1997.09[民86.09] |
頁次 | 頁445-456 |
分類號 | 445.46 |
關鍵詞 | 吸附; 粉狀吸附劑; 共流; 逆流; 吸附程序; Langmuir等溫式; Powder adsorbent; Cocurrent; Countercurrent; Adsorption process; Langmuir isotherm; |
語文 | 中文(Chinese) |
中文摘要 | 一般粉狀吸附劑都採單批式操作,吸附劑無法充分利用,造成吸附劑使用量偏 高之困擾。鑑此,本文作者曾以Freundlich等溫式為基礎提出兩篇論文,以探討共流多級 吸附程序和逆流多級吸附程序。本研究將繼續以Langmuir等溫式為基礎,分別利用共流與 逆流的階段平衡理論,進行理論解析,獲得二級、三級和∞級之吸附劑使用量及各級間濃 度之方程式,並將理論方程式經由數值方法運算加以繪圖,探討各變數(級數、吸附劑質 量比、各級間濃度比、溶液出入口濃度比、等溫常數aL)相互關係。結果顯示,多級程序 吸附劑使用量較單批式低,且兩者比值隨級數的增加,溶液出入口濃度比的降低和Langm ir常數aL的降低而下降。另外,比較相同級數共流與逆流吸附程序吸附劑使用量之差異。 解決了粉狀吸附劑在單批式吸附時,吸附容量偏低的困擾,提供選擇多級吸附程序之型態 和評估最佳操作級數之依據,並做為設計多級吸附程序之參考。 |
英文摘要 | An analysis of cocurrent and countercurrent multi-stage adsorption based on a Langmuir isotherm was investigated. Adsorbent dosages and equations for concentrations were set for each stage of two-stage, three-stage and infinite-stage processes. Theoretical equations are shown graphically using a numerical method. Interrelationships among various parameters (number of stages, ratio of adsorbent quantities, concentration ratio of each stage, concentration ratio of influent to effluent, isotherm constant, aL) are discussed. Results show that adsorbent dosage of a multi-stage process is less than that of a single-stage process; the ratio of both dosages is increased with stage number. The ratio of effluent to influent concentration decreases when Langmuir constant aL decreases. Asorbent dosages for cocurrent and countercurrent processes are compared. The results provied that the selection of the configurations for multi-stage adsorption processes can be used for the evaluation of the optimum operation stage number, which is useful for the design of multi-stage adsorption processes. |
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