Theoretical and Experimental Mass Transfer Coefficients of Permeating Components in Supported Ionic Liquid Membranes

0429231 - ÚCHP 2015 SK eng C - Conference Paper (international conference)
Izák, Pavel - Kárászová, Magda - Šimčík, Miroslav - Friess, K. - Sedláková, Zuzana - Růžička, Marek - Šolcová, Olga
Theoretical and Experimental Mass Transfer Coefficients of Permeating Components in Supported Ionic Liquid Membranes.
Proceedings. Bratislava: AXIMA Graphics Design & Printing Services, 2014 - (Markoš, J.), s. 91. ISBN 978-80-89475-13-1.
[International Conference of Slovak Society of Chemical Engineering /41./. Tatranské Matliare (SK), 26.05.2014-30.05.2014]
R&D Projects: GA TA ČR TE01020080; GA ČR GA14-12695S
Institutional support: RVO:67985858
Keywords : ionic liquid membrane * transport properties * trafer coefficients
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

A complex study of the operation of supported ionic liquid membranes from practical point of view was made. It was shown that supported ionic liquids are selective for the binary mixture of CH4/CO2. Unfortunately, the literature reports certain pure ionic liquid data, which are mainly focused on CO2 and there is lack of data for CH4. The main problem seems to be the lack of data of the diffusion coefficients of gases in ionic liquids and, consequently, there are no correlations avialable between the transport properties and the molecular properties of the gas and of the IL. A simple model of transport of gases through the liquid membrane in permeation cell was suggested. It showed that in the used pressure range (150-350kPa), the mass transfer coefficient may be assumed constant with reasonable accuracy. The model could be applied in the scale-up of the process because it takes into account the decrease of the driving force that occurs along the membrane. This decrease is not really significant in the lab scale process, where the membrane area is small, but it may be important in larger scale processes, especially when the high enrichment of retentate is required. Generally, it can be concluded that the ionic liquid membranes are convenient for gas separation processes, but it is necessary to rely on the data connected to the supported liquid membranes themselves rather than on the data of pure (free) ionic liquids. Acknowledgements: This research was supported by the Czech Republic Foundation for grant No. 14-12695S. The financial support from the Technology Agency of the Czech Republic (project TE01020080) is greatly appreciated.
Permanent Link: http://hdl.handle.net/11104/0234371