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題名 | Internal and External Mass Transfer Effects for Commercial Acid Resin Catalysts in TAME Synthesis=商用樹脂觸媒於TAME合成反應之內外質傳阻力之探討 |
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作者 | 蘇維彬; 張仁瑞; 林棕斌; 沈宏俊; Su, Wei-bin; Chang, Jen-ray; Lin, Tzong-bin; Shen, Hung-chung; |
期刊 | Journal of the Chinese Institute of Chemical Engineers |
出版日期 | 20060500 |
卷期 | 37:3 民95.05 |
頁次 | 頁249-260 |
分類號 | 468.8 |
語文 | eng |
關鍵詞 | 樹脂; 觸媒; TAME合成反應; 質傳阻力; Resin catalysts; Internal diffusion; External diffusion; Etherification; |
中文摘要 | 為克服催化蒸餾塔內反應性填料的低催化性能之缺點,結合V型塔盤及固定床之裝置正進行開發。本研究探討以酸性樹脂為觸媒的TAME合成反應之內外質傳阻力,以得到觸媒床的設計基準。我們修飾Rihko及Krause提出之速率方程式以計算反應速率,結果指出TAME合成反應的內質傳阻力並不明顯,但對TAME解離反應則相當重要。在塔溫353 K時,TAME合成反應欲達到95%的催化性能,樹脂觸媒的粒徑應小於0.9 mm,孔隙度須大於0.4。以經驗關聯式計算外質傳係數,並由恆溫管狀反應器的反應測試確認其準確度。模式的計算指出,如果操作的空間流速低至0.06h-1時,計算之雷諾數為0.04,樹脂的外質傳阻力可以忽略不計。 |
英文摘要 | To overcome the drawback of low catalytic performance of reactive packing in a catalytic distillation column, an apparatus comparising an all-V tray and fixed catalyst bed has been developed. In this study, the effects of internal and external mass transfer resistance on the tert-amyl methyl ether (TAME) synthesis catalyzed by acid resin catalysts were investigated to obtain the design criteria in the catalyst bed. Rate equations modified from the work of Rihko and Krause (1995) were used to calculate the reaction rate. The results indicated that the effect of internal mass transfer resistance on TAME formation was insignificant, whereas its effect on TAME decomposition was very significant. At a temperature of 353 K, to achieve a 95% intrinisic rate of TAME formation, the diameter of the resin particles needed to be smaller than 0.9 mm, and the porosity larger than 0.4. Empirical correlation equations were used to calculate the external mass transfer coefficient, which was confirmed by test reactions performed in an isothermal tubular reactor. As suggested by the model calculation results, the external mass transfer resistance over resins could be neglected even if Reynolds number decreased to 0.04 under operation conditions that included a space velocity of 0.06h-1. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。