Abstract
Among technologies used to remove carbon dioxide and hydrogen sulfide from natural gas and flue gas emissions, absorption processes based on amine solvents are the most common. This study investigated the potential of new hybrid amine solutions to absorb carbon dioxide compared to conventional solvents. The solubility of carbon dioxide in hybrid solvents with different mixtures of diglycolamine, water, n-methyl-2-pyrrolidone, 1-butyl-3-methylimidazolium trifluoromethanesulfonate and 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide was measured at temperatures of (∼298.15 and ∼313.15) K by a static-synthetic method. Furthermore, the viscosity, density, sound velocity and evaporation rate for the mixtures were measured. Although the addition of an ionic liquid to the solvents increased the viscosity of the solution and decreased the solubility with the aqueous diglycolamine solvents, the replacement of water with a mixture of n-methyl-2-pyrrolidone and ionic liquid increased the solubility. The exception however was observed at lower pressures.
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