利用中空纖維薄膜接觸器結合醇胺水溶液吸收二氧化碳之研究

Absorption of Carbon Dioxide in PVDF Hollow Fiber Membrane Contactor by Amine Solutions

謝濬帆(Chun-Fan Hsieh)

指導教授 ： 李夢輝

中原大學/工學院/化學工程學系/碩士(2008年)

https://doi.org/10.6840/cycu200800313

摘要

本研究主要探討利用中空纖維薄膜接觸器（PVDF hollow fiber membrane contactor），結合醇胺水溶液來捕捉二氧化碳，選用吸收液為AMP/ PZ及MDEA/ PZ，溫度控制為30 ℃。探討重點包括：（1）探討氣體流速、液體流速對有效氣液接觸面積之影響；（2）操作參數之效能評估，包括氣體流率、液體流率、吸收液的種類及PZ的濃度對二氧化碳吸收率之影響；（3）建立質傳基本資料，包括修改氣相質傳關係式 及計算吸收液滲入膜孔之比例；（4）質傳阻力之分析，分析主要的阻力落於哪一相，於不同操作條件下，探討各相質傳阻力之消長。結果顯示混合醇胺水溶液可有效降低膜相及液相之阻力（< 25 %）並擷取兩種醇胺水溶液之特性優點，包括PZ對二氧化碳的高吸收速率及AMP、MDEA對二氧化碳的高度吸收負載；結果其最適化（高二氧化碳吸收率及低 值）之吸收液配比為PZ濃度0.30 kmol• m-3加入AMP或MDEA中。
薄膜分離程序可以大量且快速地吸收二氧化碳，吸收液之黏度及和薄膜間之關係更為影響效能最重要的因素之ㄧ。本研究之結果可做為設計薄膜接觸器吸收二氧化碳之基礎資料，更可以做為日後相關研究的參考。

關鍵字

二氧化碳 ； 醇胺水溶液 ； 中空纖維膜

並列摘要

This research tested the performance of CO2 absorption from simulated flue gas stream in microporous PVDF hollow fiber membrane contactor using mixed amine solutions as absorbents. The research objectives including: (1) The influence of gas and liquid flow rates on the effective gasliquid contact area; (2) Efficiency test about the effect of operational parameters on CO2 absorption rate; (3) Structure the model to correlate the mass transfer including the effects of wetting ratio and modify the correlation to predict the gas phase mass transfer; (4) Analyze the resistance of mass transfer. Experiments were conducted at various gas flow rates (200 ~ 500 ml/min), liquid flow rates (200 ~ 500 ml/min) and absorbents (AMP system and MDEA system). The fractional resistance of the membrane increases when using PZ as promoter but it is still below 25% ol the total. For maximum absorption rate with minimal wetting ratio, the recommendation concentration for PZ in AMP or MDEA is 0.3 kmol/ m-3.
Gas absorption membrane process were shown to be an effective technology for absorbing CO2 from simulated flue gas streams, but the viscosity and solventmembrane relationship (wetting ratio) were critical factors that can significantly affect system performance.

並列關鍵字

hollow fiber ； carbon dioxide ； amine solution

參考文獻

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