Solubility of high-value compounds in environmentally friendly solvents–liquid poly(ethylene glycol) and ionic liquids: Experimental study and thermodynamic analysis

•Liquid poly(ethylene glycol) (PEG) and ionic liquids were tested as solvents for five high-value compounds.•Solubility of thymol, ferulic acid, vanillic acid, caffeic acid and caffeine, in liquid PEG and ionic liquids is studied.•Liquid PEG200 and PEG400 and ionic liquid [C4mim][OTf] showed as good...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics Vol. 70; pp. 154 - 159
Main Authors: Calado, Marta S., Branco, Adriana S.H., Najdanovic-Visak, Vesna, Visak, Zoran P.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-03-2014
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Summary:•Liquid poly(ethylene glycol) (PEG) and ionic liquids were tested as solvents for five high-value compounds.•Solubility of thymol, ferulic acid, vanillic acid, caffeic acid and caffeine, in liquid PEG and ionic liquids is studied.•Liquid PEG200 and PEG400 and ionic liquid [C4mim][OTf] showed as good solvents for the high value compounds. In this work the (solid+liquid) equilibria (SLE) of the solution of sustainable solvents with five high-value compounds, thymol, ferulic acid, vanillic acid, caffeic acid and caffeine, was investigated. The sustainable solvents studied were liquid poly(ethylene glycol) of average molecular mass 200 and 400 – (PEG200 and PEG400), respectively as well as imidazolium ionic liquids with bistriflamide and triflate anions ([C4mim][NTf2] and [C4mim][OTf]). The obtained SLE data were correlated using the semi-empirical equation proposed by Grant. The activity coefficients of the studied solutes were calculated. Based on these correlations and calculations as well as on the thermo-physical properties of the pure constituents, the SLE behavior of the studied solutions was analyzed and discussed.
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ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2013.10.036