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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 1
BKCSDE 31(1)
January 20, 2010 

 
Title
CO2 Solubilities in Amide-based Brønsted Acidic Ionic Liquids
Author
Jelliarko Palgunadi, Jinkyu Im, Je Eun Kang, Hoon Sik Kim*, Minserk Cheong*
Keywords
Brønsted acidic ionic liquids, Amide-based ionic liquids, Carbon dioxide, Solubility
Abstract
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.
Page
146 - 150
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