The solubility of CO 2 in two biodegradable ionic liquids tris(2-hydroxyethyl)methylammonium methylsulfate [THMA][MeSO 4 ] and 2-hydroxyethyl-trimethylammonium lactate [2HETMA][Lac] has been studied experimentally. A synthetic method was used to measure bubble-point pressures up to 8 MPa for a temperature range of 313 K to 363 K. The solubility of CO 2 in [2HETMA][Lac] is much higher than in [THMA][MeSO 4 ], but the solubility increment is lower at higher CO 2 concentrations. The solubility of CO 2 in [THMA][MeSO 4 ] is much lower compared to ionic liquids containing the same anion, but lacking hydroxyl-groups in the cation. The hydroxyl-groups required for the biodegradability of the IL have a detrimental effect on the CO 2 solubility. [THMA][MeSO 4 ] and [2HETMA][Lac] are not suitable for CO 2 capture and can be considered as an example of a contradictive design where the biodegradability is improved upon introducing hydroxyl-groups, while the CO 2 solubility is reduced significantly. The experimental data has been modeled with good accuracy using the Peng–Robinson equation of state in combination with the Wong–Sandler mixing rules.
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Bazhenov et al. (2014) studied this question.
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