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Type: Artigo de periódico
Title: Liquid-liquid equilibrium of ternary systems 1-butyl-3-methylimidazolium hexafluorophosphate plus aromatic plus aliphatic
Author: Maduro, RM
Aznar, M
Abstract: Liquid-liquid equilibrium data for the ternary systems nonane + benzene + [bmim][PF6], nonane + toluene + [bmim][PF6], nonane + m-xylene + [bmim][PF6], undecane + benzene + [bmim][PF6], undecane + toluene + [bmim][PF6], undecane + m-xylene + [bmim][PF6]) were determined at 298.15 K. Binodal curves were obtained by the cloud point method, while tie-line compositions were obtained by density and UV spectrophotometry measurements. In all cases the two-phase region is large and wide. The values of distribution coefficients and selectivities indicate that the ionic liquid [bmim][PF6] is a good solvent for the extraction of aromatic from aliphatic compounds. The consistency of the tie-line data was ascertained by applying the Othmer-Tobias correlation. The experimental LLE data were correlated through the well-known NRTL model for the activity coefficient, with estimation of new interaction energy parameters, using the Simplex minimization method and a composition-based objective function. The results, analyzed in terms of root mean square deviations between experimental and calculated compositions, were considered satisfactory. (c) 2008 Elsevier B.V. All rights reserved.
Subject: liquid-liquid equilibrium
ionic liquids
imidazoliurn cation
Country: Holanda
Editor: Elsevier Science Bv
Citation: Fluid Phase Equilibria. Elsevier Science Bv, v. 265, n. 41671, n. 129, n. 138, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.fluid.2008.01.007
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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