CO2 Solubilities in Amide-based Brønsted Acidic Ionic Liquids

• Published in: Bulletin of the Korean Chemical Society pp. 146 - 150
• Main Authors: Jelliarko Palgunadi, 임진규, Je Eun Kang, 김훈식, 정민석
• Format: Journal Article
• Language: English
• Published: 대한화학회 01.01.2010
• Subjects: 화학
• ISSN: 0253-2964; 1229-5949
• DOI: 10.5012/bkcs.2010.31.01.146

A distinguished class of hydrophobic ionic liquids bearing a Brønsted acidic character derived from amide-like compounds were prepared by a neutralization reaction of N,N-diethylformamide, N,N-dibutylformamide, 1-formylpiperidine, and ε-caprolactam with trifluoroacetic acid and physical absorptions of CO2 in these ionic liquids were demonstrated and evaluated. CO2 solubilities in these ionic liquids were influenced by the molecular structure of the cation and were apparently increased with the molar volume. Comparison based on a volume unit reveals that CO2 solubilities in these liquids are relatively higher than those in imidazolium-based ionic liquids. Henry’s coefficients calculated from low-pressure solubility tests at 313 to 333 K were used to derive the thermodynamics quantities. Enthalpy and entropy of solvation may share equal contributions in solubility KCI Citation Count: 10