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Reversible ionic liquids as double-action solvents for efficient CO<inf>2</inf> capture

Abstract:

The application of single-component reversible ionic liquids derived from siloxylated amines and CO2 was described. Reversible solvents improved upon conventional ionic liquids by enabling a dual capture mechanism. Specifically, they function not only as physical absorbents but also as chemical adsorbents for CO2, offering high selectivity of CO2/N2 in dilute flue gas streams. Two moles of solvent reacted with one mole of CO2 to form the ionic liquid, which then acted as a solvent to physically absorb additional CO2. The novel solvents produced a clean CO2 stream upon reversal. The solvent properties, such as regeneration temperature, can be tuned by simple structural modifications. These changes could result to meeting the desired goals, e.g., high adsorption and absorption capacity, low energy use for CO2 desorption and precursor regeneration, low viscosity, low corrosion, and low cost. This is an abstract of a paper presented at the AiChE Spring National Meeting & 5th Global Congress on Process Safety (Tampa, FL 4/26-30/2009).