Fluid-phase behavior of {1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, [C(6)mim][NTf2], plus C-2-C-8 n-alcohol} mixtures: Liquid-liquid equilibrium and excess volumes

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In the frame of the IUPAC Project entitled Thermodynamics of ionic liquids, ionic liquid mixtures, and the deVelopment of standarized systems, 1- hexyl- 3- methylimidazolium bis( trifluoromethylsulfonyl) imide, [C(6)mim][ NTf2], was selected as the "model" ionic liquid to perform round-robin measurements on a series of ionic liquid properties. In this work, the temperature- composition liquid-liquid equilibria of this ionic liquid with linear alkan-1- ols, CnH(2(n)+ 1) OH, with n) 4, 5, 6, and 8, were determined at a nominal pressure of 0.1 MPa and up to 50 MPa for n) 4, 5, and 6. Excess molar volumes, V-E, of mixtures of this same ionic liquid with linear alkan1- ols, CnH(2n+1)OH, with n ranging from 2 to 5, were measured at a nominal pressure of 0.1 MPa. The consistency between the two sets of experimental data ( phase diagrams and VE) was analyzed from a theoretical perspective; we noticed that as the alkyl chain length, n, of the linear alcohol varies both the pressure dependence of the phase diagrams and the critical excess molar volume change sign.
Original languageUnknown
Pages (from-to)2215-2221
JournalJournal of Chemical and Engineering Data
Issue number6
Publication statusPublished - 1 Jan 2006

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