四烷基銨氨基酸離子液體水溶液應用於二氧化碳捕捉

Carbon Dioxide Capture with Tetra-Alkyl-Ammonium Amino Acid Ionic Liquid Aqueous Solution

李孟玲(Lee, Meng Ling)

指導教授 ： 汪上曉

國立清華大學/工學院/化學工程學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00058

摘要

由於石化燃料的大量使用，全球二氧化碳濃度逐年增高，造成溫室效應日益嚴重，使人類生存與生態環境面臨重大的威脅，二氧化碳的減排已是全球關注的議題。在二氧化碳捕捉的方法中，化學吸收捕捉二氧化碳為目前工業上最廣為使用的方法，商業化的吸收劑中又以醇胺水溶液最為常見。理想的吸收劑，應該在吸收過程不沉澱的情況下，具有高的吸收負載與快的吸收速率，脫附過程擁有高的循環負載量及少量的溶劑損失，最重要是低的再生能耗。本研究以30wt%乙醇胺水溶液作為吸收劑的標準品，四烷基銨如Tetramethylammonium ([N1111])、Tetraethylammonium ([N2222])、Methyl-triethylammonium ([N2221])、Methyl-tributylammonium ([N1444])及(1-Butyl)triethylammonium ([N2224])作為陽離子，氨基酸如L-丙氨酸(L-Alanine)、β-丙氨酸(β-Alanine)、甘氨酸(Glycine)、肌氨酸(Sarcosine)及脯氨酸(L-proline)作為陰離子，合成25 wt%四烷基銨氨基酸離子液體水溶液，進行二氧化碳的吸附及再生實驗，結果發現 [N1444][L-Ala]在80℃循環過程中不會有沉澱的問題，同時達到良好的吸收與脫附效率，再生能耗也很低，此吸收劑在二氧化碳捕捉上有很大潛力的應用。

關鍵字

二氧化碳 ； 離子液體 ； 氨基酸 ； 化學吸收

並列摘要

Increasing CO2 emissions from using fossil fuels and the resulting greenhouse effect have received extensive concerns, and the reduction of CO2 has become the global trend. One of the most important CO2 capture methods is the chemical absorption, which are widely applied to industrial plants. Amine-based solutions are considered as common absorbents to effectively capture CO2. Although these absorbents have high absorption reactivity, there are certain serious problems such as high energy cost during the regeneration process. An ideal absorbent should have high cyclic loading and low solvent consumption amount without suffering precipitation. Low regeneration energy penalty is the most important economic factor in a CO2 capture process. In this study, 30wt% monoethanolamine (MEA) solution was used as a basic standard to evaluate CO2 capture performance of new absorbents. Cations (tetramethylammonium [N1111], tetraethylammonium [N2222], methyl-triethylammonium[N2221], Methyl-tributylammonium [N1444], and (1-Butyl)triethylammonium [N2224]) and anions (L-Alanine, β-Alanine, Glycine, Sarcosine, and L-proline) were combined to yield 25 wt% tetra-alkyl-ammonium amino acid ionic liquid aqueous solutions, and then CO2 absorption and regeneration performances of new absorbents were investigated. The results show that [N1444][L- Alanine] have both high absorption and desorption efficiency without precipitation problem. Regeneration energy penalty of this absorbent is lower than heat of amine-based solutions. Thus, [N1444][L- Alanine] can be considered as a potential candidate for CO2 capture.

並列關鍵字

Carbon Dioxide ； Ionic Liquid ； Amino Acid ； Chemical Absorption

參考文獻

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