Absorption of carbon dioxide in aqueous solutions of imidazolium ionic liquids with carboxylate anions

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• 作者：Stefan Baj ; Tomasz Krawczyk ; Aleksandra Dąbrowska…
• 关键词：Absorption ; Carbon Dioxide ; Carboxylate Ionic Liquids ; Solubility ; Water Content
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：32
• 期：11
• 页码：2295-2299
• 全文大小：231 KB
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• 作者单位：Stefan Baj (1) (2)
  Tomasz Krawczyk (1)
  Aleksandra Dąbrowska (1)
  Agnieszka Siewniak (1)
  Aleksander Sobolewski (2)
  
  1. Department of Chemical Organic Technology and Petrochemistry, Faculty of Chemistry, Silesian University of Technology, Krzywoustego 4, 44-100, Gliwice, Poland
  2. Institute for Chemical Processing of Coal, Zabrze, Poland
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

The solubility of carbon dioxide at atmospheric pressure in aqueous mixtures of 1,3-alkyl substituted imidazolium ionic liquids (ILs) containing carboxylic anions was studied. The ILs showed increased solubility of CO₂ with decreasing water concentration. The relationship between the CO₂ concentration in solution and the mole fraction of water in the ILs describes a sigmoidal curve. The regression constants of a logistic function were used to quantitatively assess the absorbent capacity and the effect of water on CO₂ absorption. ILs containing the most basic anions, such as pivalate, propionate and acetate, had the best properties. It was observed that the impact of water on absorption primarily depended on the cation structure. The best absorption performance was observed for 1,3-dibutylimidazolium pivalate and 1-butyl-3-methyl imidazolium acetate.