Document Detail


Effect of Water on the Carbon Dioxide Absorption by 1-Alkyl-3-Methylimidazolium Acetate Ionic Liquids.
MedLine Citation:
PMID:  23145571     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The absorption of carbon dioxide by the pure ionic liquids 1-ethyl-3-methylimidazolium acetate ([C1C2Im][OAc]) and 1-butyl-3-methylimidazolium acetate ([C1C4Im][OAc]) was studied experimentally from 303 K to 343 K. As expected, the mole fraction of absorbed carbon dioxide is high (0.16 at 303 K and 5.5 kPa and 0.19 at 303 K and 9.6 KPa for [C1C2Im][OAc] and [C1C4Im][OAc], respectively), does not obey Henry's law and is compatible with the chemisorption of the gas by the liquid. Evidence of a chemical reaction between the gas and the liquid was found both by NMR and by molecular simulation. In the presence of water, the properties of the liquid absorber significantly change, especially the viscosity that decreases by as much as 25% (to 78 mPas) and 30% (to 262 mPas) in presence of 0.2 mole fraction of water for [C1C2Im][OAc] and [C1C2Im][OAc] at 303 K, respectively. The absorption of carbon dioxide decreases when the water concentration increases - a decrease of 83% in CO2 absorption is found for [C1C4Im][OAc] with 0.6 mole fraction of water at 303 K. It is proved in this work, by combining experimental data with molecular simulation, that the presence of water not only renders the chemical reaction between the gas and the ionic liquid less favorable but it also lowers the (physical) solubility of the gas as it competes by the same solvation sites of the ionic liquid. The lowering of the viscosity of the liquid absorbent largely compensates these apparent drawbacks and the mixtures of [C1C2Im][OAc] and [C1C2Im][OAc] with water seem promising to be used for carbon dioxide capture.
Authors:
Stephane Stevanovic; Ajda Podgorsek; Agilio A H Padua; Margarida F Costa Gomes
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-13
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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