Solvation parameter model and thermodynamic parameters in a dicationic ionic liquid based on pyrrolidinium

• Novel dicationic ionic liquid based pyrrolidinium was synthesized ([C9(2MNPTpy)2][(NTf2)2]).
• Interactions between the solutes and solvent were measured in this ionic liquid by using Abraham solvation parameter model.
• Activity coefficient at infinite dilution has been determined in this IL for 26 polar and non-polar compounds.
• The [C9(2MNPTpy)2][(NTf2)2] has a good potential for separation of the aromatic and aliphatics.

The activity coefficient at infinite dilution, γ∞γ∞ has been determined for 26 solutes (alkanes, alcohols, amines, aromatics, chloroalkanes, ketones, ethers) in a newly developed dicationic ionic liquid 1,9-di(N-naphthalen-2-ylmethylpyrrolidinium)nonanebis[(trifluoromethyl)sulfonyl]imide ([C9(2MNPTpy)2][(NTf2)−2]) by inverse gas chromatography at four different temperatures (T = 313, 323, 333 and 343 K). Solvation interactions between solvents and solute molecules have been estimated at T = (313, 343 and 373) K using Abraham solvation parameter. The experiments were carried out at various stationary phase loadings of (5 to 18)%. The selectivity values for cyclohexane/aromatics, octane/linear alcohols, octane/polar solutions were extracted from experimental activity coefficient data at T = 313 K. Compared with other ionic liquids from the literatures, this ionic liquid can be utilized as an efficient solvent for (aromatic + aliphatic) separation.

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