Wetting Of Supports By Ionic Liquids Used In Gas Separation Processes

Physicochem. Probl. Miner. Process. 48(1), 2012, 129–140
Wetting Of Supports By Ionic Liquids Used In Gas Separation Processes
Monika Joskowska, Iwona Kopczynska, Bartosz Debski, Daria Holownia-Kedzia, Robert Aranowski, Jan Hupka
aran@chem.pg.gda.pl
Department of Chemical Technology, Chemical Faculty, Gdansk University of Technology, 80-952 Gdansk, Poland.
Abstract
Ionic liquids were found to be selective solvents for separation of gases. They are widely used in supported ionic liquid membranes (SILMs) technology, especially in gas separation and purification processes. This work has characterized commercially available porous membranes employed in such purposes. Characterization of supports and membrane phases was carried out in order to determine factors influencing membrane stability. Scanning electron microscopy (SEM) was used to determine morphology of membrane surface. In this work wetting of the polymeric support with [Emim][TfO], [Emim][Tf2N], [Bmim][TfO] and [Bmim][Tf2N] and swelling of the membrane impregnated with ionic liquids have been investigated.
Introduction
This work focused on the use of polymeric porous membranes which can be applied as support for liquid membranes. Experimental procedures based on capillary rise method are widely used for porous media characterization (i.e. pore radius, contact angle). Measurements of penetration distance and liquid mass increase are two main experimental methods, in which Washburn equation is a basic instrument to analyze the obtained results (Trong et al., 2005; 2006). Capillary rise method was used for contact angle determination for polymeric material wetted by ionic liquids. Influence of imidazolium-based ionic liquids composition on wettability of porous supports was investigated. The family of 1-alkyl-3-methylimidazolium compounds (Cnmim) with variable alkyl chain lengths in cation and changeable anions were taken into account.
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