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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 8
BKCSDE 30(8)
August 20, 2009 
 
Title
 Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO2 Absorbents
Author
 Jelliarko Palgunadi, Je Eun Kang, Minserk Cheong, Honggon Kim, Hyunjoo Lee*, Hoon Sik Kim*
Keywords
 CO2 solubility, Room temperature ionic liquids, Dialkylimidazolium dialylphosphate, Dialkylimidazolium alkylphosphite
Abstract
 Solubilities of carbon dioxide (CO2) in a series of fluorine-free room temperature ionic liquids (RTILs), dialkylimidazolium dialkylphosphates and dialkylimidazolium alkylphosphites, were measured at 313∼333 K and pressures up to 5 MPa. Henry’s law coefficients as the solubility parameter of CO2 in RTILs were derived from the isotherm of fugacity versus CO2 mole fraction. The CO2 solubility in a phosphorus-containing RTIL was found to increase with the increasing molar volume of the RTIL. In general, dialkylimidazolium dialkylphosphate exhibited higher absorption capacity than dialkylimidazolium alkylphosphite as long as the RTILs possess an identical cation. Among RTILs tested, 1-butyl-3-methylimidazolium dibutylphosphate [BMIM][Bu2PO4] and 1-butyl-3-methylimidazolium butylphosphite [BMIM][BuHPO3] exhibited similar Henry’s law coefficients to 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([BMIM][Tf2N]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), respectively. The Krichevsky-Kasarnovsky equation was employed to derive the CO2 solubility parameter (Henry’s law coefficient) from the solubility data measured at elevated pressures.
Page
 1749 - 1754
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