Abstract

New experimental results are presented for the solubility of carbon monoxide in the ionic liquid 1-N-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) for temperatures from 293 to 373K and pressures up to about 10MPa. The experimental results reveal nearly no influence of temperature on the solubility of CO in [bmim][PF6]. The ionic liquid [bmim][PF6] is a poor solvent for carbon monoxide; for example, at 9MPa only about 0.15mole of the gas are dissolved in 1kg of the ionic liquid. The (extended) Henry's law is applied to correlate the solubility pressures.

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