Available Technology

Allyl-Containing Ionic Liquid Solvents for Co2 Capture

Research is active on the patent pending technology titled,“Sulfur Tolerant Ionic Liquid Solvent for Pre-combustion Carbon Capture.” This invention is available for licensing and/or further collaborative research from U.S. Department of Energy’s National Energy Technology Laboratory.
Patent Abstract: 
Low temperature, pre-combustion carbon dioxide (CO2) capture is typically accomplished using physical solvents such as Solexol™. This is due to the high partial pressure of CO2 in the flue gas stream which is sufficient to dissolve significant amounts of CO2 into the solvent without the need for additional chemical reactions. Regeneration of the solvent and release of CO2 can be accomplished with increased temperature and/or pressure reduction. However, there is a need to create solvents that are tolerant to sulfur, and water, which can operate at higher temperatures. In addition, the solvents need to have low viscosity, high CO2 solubility, and excellent CO2/hydrogen (H2) selectivity. This invention describes the use of allyl group containing ionic liquid solvents (ILs) for pre-combustion CO2 capture. The inclusion of allyl groups into ionic liquids structure produces ILs with lower viscosity and better CO2 solubility than their alkyl counterpart. In addition, these materials tend to be tolerant to sulfur and water. The ionic nature of these materials renders them with low vapor pressure, high thermal stability and high CO2/H2 selectivity.
ILs produced using this method are sulfur and water tolerant -ILs display lower viscosity and enhanced CO2 solubility -Superior CO2 and H2 selectivity
Patent Number: 
U.S. Patent Pending
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