Original title:
Process-Based Model of Mixed-Matrix Membrane
Authors:
Čapek, P. ; Hejtmánek, Vladimír ; Veselý, M. ; Sysel, P. ; Kočiřík, Milan ; Brabec, Libor ; Zikánová, Arlette ; Bernauer, B. ; Fíla, V. Document type: Papers Conference/Event: International Congress of Chemical and Process Engineering CHISA 2012 and 15th Conference PRES 2012 /20./, Prague (CZ), 2012-08-25 / 2012-08-29
Year:
2012
Language:
eng Abstract:
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.
Keywords:
composite material; gas separation processes; mixed-matrix membrane Host item entry: Final Program, ISBN 978-80-905035-1-9 Note: Související webová stránka: www.chisa.cz/2012
Rights: This work is protected under the Copyright Act No. 121/2000 Coll.