LLE for (Water + Ionic liquid) Binary Systems using [Cxmim][BF4] (x = 6, 8 and 10) Ionic Liquids

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2009

Autores

Maria Eugénia Macedo (Autor) FEUP; Filipa Maia (Autor) Outra; Oscar Rodríguez (Autor) FEUP

Ata de Conferência Internacional

Título: VIII Iberoamerican Conference on Phase Equilibra and Fluid Properties for Process Design

VIII Iberoamerican Conference on Phase Equilibra and Fluid Properties for Process Design (EQUIFASE 2009)

Praia da Rocha, Portugal, 17-21 October 2009

Indexação

ISI Proceedings

Classificação Científica

CORDIS: Ciências Tecnológicas

FOS: Ciências da engenharia e tecnologias

Outras Informações

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 ([Cxmim][BF4] with x = 6 and 8). The gravimetric method was used to determine the equilibrium compositions at temperatures ranging from 278.15 to 340.15 K. Both systems present an upper critical solution temperature (UCST), which increases from [C6mim][BF4] to [C8mim][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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Notas: ISBN: 978-989-20-1694-8

Nº de páginas: 6