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Solubility of the Single Gases Carbon Monoxide and Oxygen in the Ionic Liquid [hmim][Tf2N]

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Department of Mechanical and Process Engineering, University of Kaiserslautern, P.O. Box 3049, D-67653 Kaiserslautern, Germany
†The experimental results for the solubility of carbon monoxide in [hmim][Tf2N] were presented at the Conference “THERMO International 2006 (16th Symposium on Thermophysical Properties, 19th International Conference on Chemical Thermodynamics, 61st Calorimetry Conference)”, held in Boulder, Colorado, July 30−August 04, 2006.
* Corresponding author. Tel.: +49 631 205 2410. Fax: +49 631 205 3835. E-mail: [email protected]
Cite this: J. Chem. Eng. Data 2009, 54, 3, 966–971
Publication Date (Web):February 10, 2009
Copyright © 2009 American Chemical Society

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    Experimental data for the solubility of the two single gases carbon monoxide and oxygen in the ionic liquid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([hmim][Tf2N]) are reported for temperatures between (293.25 and 413.2) K. The maximum pressure (the maximum gas molality) was 9.8 MPa (0.27 mol·kg−1) for carbon monoxide and 9.1 MPa (0.31 mol·kg−1) for oxygen. The experiments were performed using a high-pressure view-cell technique operating on the synthetic method. Oxygen shows a slightly higher solubility than carbon monoxide under all conditions investigated, but the solubility generally remains very low. Both gases become less soluble in [hmim][Tf2N] with increasing temperature; however, the effect is not very pronounced and becomes ambiguous for carbon monoxide above 373 K. An extension of Henry’s law is employed in correlating the solubility pressures. The final results for the Henry’s constant (at zero pressure) of carbon monoxide and oxygen in [hmim][Tf2N] (on the molality scale) are represented within the experimental uncertainty (1 % for both gases) by ln(kH,CO(0)/MPa) = 5.3954 − 364.2/(T/K) − 0.002356 (T/K) and ln(kH,O2(0)/MPa) = 5.7618 − 505.1/(T/K) − 0.002802 (T/K), respectively.

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