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Green Chemistry Vol - 9 Issue - 3

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Influence of high pressure on solubility of ionic liquids: experimental data and correlation

Content Provider	Royal Society of Chemistry (RSC)
Author	Domańska, Urszula Morawski, Piotr
Copyright Year	2007
Abstract	The solid–liquid phase equilibrium (SLE) in binary mixtures that contain a room-temperature ionic liquid, IL, and an organic solvent: {1-ethyl-3-methylimidazolium tosylate, [EMIM][TOS] (1) + cyclohexane, or benzene (2)} and {1,3-dimethylimidazolium methylsulfate, [MMIM][CH3SO4] (1) + hexan-1-ol (2)} have been measured under very high pressures up to about 900 MPa at the temperature range from T = 328 to 363 K. The termostatted apparatus for the measurements of transition pressures from the liquid to the solid state was used. The pressure–temperature–composition relation of the high pressure solid–liquid phase equilibria polynomial based on the Yang model was satisfactorily used. The freezing and melting temperatures at a constant composition increase monotonously with pressure. The high pressure experimental results obtained at isothermal conditions (p–x) were interpolated to well known T–x diagrams. Additionally, the SLE of binary systems {[EMIM][TOS] (1) + cyclohexane, or benzene (2)} at normal pressure have been measured by a dynamic method from 270 K to the melting point of the IL. Experimental solubility results are compared with values calculated by means of the non-random, two-liquid equation (NRTL) utilizing parameters derived from SLE and liquid–liquid equilibria (LLE) results. The experimental results at high pressures were compared for every system to these at normal pressure. The paper includes thermophysical basic characterization of pure ionic liquids obtained via differential scanning calorimetry (DSC), temperatures and enthalpies of melting. The influence of the interaction between the IL and solvent on the solubility at 0.1 MPa and high pressure up to 900 MPa was discussed.
Starting Page	361
Ending Page	368
Page Count	8
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	9
Issue Number	4
Journal	Green Chemistry
DOI	10.1039/b608059f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	NRTL DSC Ionic liquid Solvent Tosyl Cyclohexane Benzene Polynomial Isothermal process Non-random two-liquid model Differential scanning calorimetry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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