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

被引：16
作者：
Baj, Stefan [1 ,2 ]
Krawczyk, Tomasz [1 ]
Dabrowska, Aleksandra [1 ]
Siewniak, Agnieszka [1 ]
Sobolewski, Aleksander [2 ]
机构：
[1] Silesian Tech Univ, Fac Chem, Dept Chem Organ Technol & Petrochem, PL-44100 Gliwice, Poland
[2] Inst Chem Proc Coal, Zabrze, Poland
来源：
KOREAN JOURNAL OF CHEMICAL ENGINEERING | 2015年 / 32卷 / 11期
关键词：
Absorption; Carbon Dioxide; Carboxylate Ionic Liquids; Solubility; Water Content; SELECTIVE CHEMICAL-SEPARATION; CO2; ABSORPTION; CAPTURE; CHEMISORPTION; WATER; TEMPERATURE; SOLUBILITY;
D O I：
10.1007/s11814-015-0082-2
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
引用
收藏
页码：2295 / 2299
页数：5
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