Compressed liquid densities for the binary mixture [Emim] chloride + octane and for the ternary mixture [Emim] chloride + octane + CO₂

Ionic liquids have been applied for the removing of sulfur and nitrogen compounds from fuels. One of the issues to solve is the regeneration of the ionic liquid after the extraction process. CO₂ has been proposed for such regeneration. However, basic information about phase equilibria and volumetric behavior data are scarce for mixtures involving ionic liquids, sulfur compounds, fuel compounds, and CO₂ for the understanding of all the phenomena involved in the mentioned separations. Thus, compressed liquid densities were measured for the binary mixtures composed by 1-ethyl-3-methylimidazolium [Emim] chloride + octane and for ternary mixtures composed by [Emim] chloride + octane + CO₂ at 313-363 K and ≤ 25 MPa. Experimental densities were correlated using two empirical equations. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 10/30/2005-11/4/2005).