Mutual solubilities between water and ionic liquids

I&EC 121

M. G. Freire, mmartins@dq.ua.pt1, P. J. Carvalho, quijorge@ua.pt1, A. M. A. Dias, adias@dq.ua.pt1, A. J. Queimada, antonioq@dq.ua.pt1, L. M. N. B. F. Santos, lbsantos@fc.up.pt2, Ana M. Fernandes, afernandes@dq.ua.pt3, I. M. Marrucho, imarrucho@dq.ua.pt1, and J. A. P. Coutinho, jcoutinho@dq.ua.pt1. (1) CICECO, Department of Chemistry, University of Aveiro, Campus Universitario de Santiago, Aveiro, 3810-193, Portugal, (2) Centro de Investigação em Química, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre 687, Porto, 4169-007, Portugal, (3) Department of Chemistry, University of Aveiro, Campus Universitario de Santiago, Aveiro, 3810-193, Portugal
For ionic liquids (ILs) to be used effectively as solvents in liquid-liquid extraction, it is important to know the mutual solubilities between ILs and the second liquid phase. This study focuses on hydrophobic imidazoliums and phosphoniums based ILs presenting low water solubilities. The influence of the anion and cation substitution on the solubility was studied. The IL content in the water-rich phase was analyzed using UV-vis spectroscopy for the imidazolium based ILs and Mass Spectrometry for the imidazolium and phosphonium based ILs. A qualitative comparison between both methods providing quantitative data was obtained. The solubility of water in the ILs was measured in temperature interval between 288 and 318 K and at p=0.1 MPa, using a methodology based in the analyses of water content by Karl Fischer titration. The COSMO-RS quantum chemical based method was applied to describe the mutual solubilities of ILs-water system.
 

Ionic Liquids: Not Just Solvents Anymore OR Ionic Liquids: Parallel Futures (Sponsored by Green Chemistry and Engineering, Separation Science and Technology and Novel Chemistry with Industrial Applications Sub-Divisions)
8:00 PM-10:00 PM, Sunday, 26 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster

Division of Industrial and Engineering Chemistry

The 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006