LLE for (water plus ionic liquid) binary systems using [C(x)mim][BF4] (x=6, 8) ionic liquids

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Filipa M. Maia (Author) FEUP; Oscar Rodríguez (Author) FEUP; Eugénia A. Macedo (Author) FEUP

Journal

Title: Fluid Phase Equilibria

Vol. 296

Pages: 184-191

ISSN: 0378-3812

Publisher: Elsevier

Indexing

ISI Proceedings

ISI Web of Knowledge - 38 Citations

ISI Web of Science

Scopus - 44 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-003-2S8

DOI: 10.1016/j.fluid.2010.05.003

Abstract (EN): Liquid-liquid equilibrium diagrams were determined for (IL + water) systems using the family of ILs 1-alkyl-3-methylimidazolium tetrafluoroborates, where the alkyl groups are hexyl and octyl ([C(x)mim][BF4] with x=6 and 8). The gravimetric method was used to determine the equilibrium compositions at temperatures ranging from 278.15 to 340.15K. Both systems present an upper critical solution temperature (UCST), which increases from [C(6)mim][BF4] to [C(8)mim][BF4]. The experimental data were correlated using the NRTL and eNRTL models. The binary interaction parameters were calculated for each system and model, and good agreement between experimental and calculated equilibrium compositions was obtained. Finally, the apparent Gibbs energy, enthalpy and entropy of water solution in the ILs were calculated using a modified van't Hoff equation. The three thermodynamic functions were found to be positive for both ILs.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8