Process-Based Model of Mixed-Matrix Membrane

0381762 - ÚCHP 2013 CZ eng C - Konferenční příspěvek (zahraniční konf.)
Čapek, P. - Hejtmánek, Vladimír - Veselý, M. - Sysel, P. - Kočiřík, Milan - Brabec, Libor - Zikánová, Arlette - Bernauer, B. - Fíla, V.
Process-Based Model of Mixed-Matrix Membrane.
Final Program. Praha: Orgit, 2012, C7.2. ISBN 978-80-905035-1-9.
[International Congress of Chemical and Process Engineering CHISA 2012 and 15th Conference PRES 2012 /20./. Prague (CZ), 25.08.2012-29.08.2012]
Institucionální podpora: RVO:67985858 ; RVO:61388955
Klíčová slova: mixed-matrix membrane * composite material * gas separation processes
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství
www.chisa.cz/2012

The focus of this contribution was on the formulation and verification of a process-based model of the mixed-matrix membrane that consisted of the polyimide matrix synthesized from the monomers 4,4’-(hexafluoroisopropylidene)diphtalic anhydride and 4,4’-oxydianiline, and silicalite-1. When a solution of a polyimide precursor in N,N-dimethylformamide was ready, silicalite-1 particles were dispersed in the solution and the dispersion was subsequently cast on a Teflon support plate. An initial mass ratio of silicalite-1 and polyimide was about 1:1. After solvent removal, the films were heated in subsequent steps up to 230°C for two hour. From a process-based model point of view, a key operation of the entire synthesis was slow sedimentation of silicalite particles in the viscous solution. Preliminary observation of 2D cuts through the solid membrane in a scanning electron microscope revealed that there were a lot of contacts among the silicalite particles. Therefore, a sequential (ballistic) deposition algorithm, well representing sedimentation in a low-energy environment, was used to create an off-lattice model of spatial distribution of the silicalite particles in the polyimide matrix.
Trvalý link: http://hdl.handle.net/11104/0212157