Examination of the Potential of Ionic Liquids for Gas Separations

Supported ionic liquid phase (SILP) materials for removal of hazardous gas compounds – efficient and irreversible NH3 adsorption

“…In a first set of experiments the pure, hydrophobic ionic liquids, [C 8 28 the Henry coefficient for ammonia in the same IL was lowered by a factor of 10 indicating a much higher solubility of ammonia in this ionic liquid. Compared to the metal-free ILs, the ionic metal complex solutions showed again a significantly higher ammonia uptake, since the latter bind ammonia by physisorption and chemisorption.…”

Perspectives of Ionic Liquids Applications for Clean Oilfield Technologies

“…This process is expensive due to high energy consumption at desorption stage and loss of the amine during the treatment and amine recovery (Rao & Rbin, 2002). During the present century, a big number of studies have been performed to explore the prospects of ILs for gases separation and for founding the best prototypes for CO 2 capture (Bates et al, 2002, Baltus et al, 2004, Baltus et al, 2005, Shiflett & Yokozeki, 2005, Jacquemin et al, 2006, Hou & Baltus, 2007, . Schilderman et al, 2007, Yokozeki & Shiflett, 2007, Sánchez et al, 2007, Ventura et al, 2008, Camper et al, 2008, Soriano et al, 2008, Soriano et al, 2009, Heintz et al, 2009, a, b. Carvalho et al, 2009, Kuleman et al, 2010, Shokouhi et al, 2010 and also several discoveries have been patented (Brennecke & Maginn, 2002, Davis Jr., 2004, Chinn et al, 2006.…”

Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO2Absorbents

“…Several RTILs have been shown to selectively absorb CO2 and SO2 from mixtures of light alkanes, oxygen, hydrogen, nitrogen, or carbon monoxide. [3][4][5] A number of reports have been published on the CO2 solubility in RTILs and on the application of RTILs to the reversible CO2 absorption, but most of them are mainly focused on the use of dialkylimidazolium-based RTILs with costly fluorinated anions such as tetrafluoroborate ([BF4]), 1,3,6,7 hexafluorophosphate ([PF6]), 1,7,8 and bis(trifluoromethylsulfonyl)imide ([Tf2N]), 1,7,[9][10][11] apparently, due to their relatively strong affinities to CO2. 12 The weak Lewis acid-base interaction of CO 2 with the anion of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM] [BF4]) or 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) has been demonstrated by an in-situ ATR-IR study.…”

“…1,2 The separation of CO2 through physical interaction is particularly attractive because the stripping of CO2 from a RTIL can be operated at a much milder condition than that from a conventional aqueous amine-based solution, hence reducing the overall operation cost. Several RTILs have been shown to selectively absorb CO2 and SO2 from mixtures of light alkanes, oxygen, hydrogen, nitrogen, or carbon monoxide.…”