Composite membranes for gas separation

Authors: Shahidi, Kazem
Advisor: Rodrigue, Denis
Abstract: In this work, an efficient method with a limited amount of solvent use is presented to produce high-performance flat sheet composite membranes for gas separation. In particular, a series of polydimethylsiloxane/low-density polyethylene (PDMS/LDPE) membranes were produced by coating an active PDMS layer on a microporous LDPE support via continuous extrusion and salt leaching using immersion in hot water. The proposed method is simple and cost-effective since it is based on inexpensive materials (LDPE and PDMS) and uses a low amount of an environmentally friendly solvent (water). To improve the composite membranes performance and properties, trimethylsiloxy grafted fumed silica (TFS) particles were incorporated into the PDMS layer to produce PDMS-TFS/LDPE nano-composite membranes. The membranes were then characterized in terms of morphology, porosity and pore size distribution, as well as thermal, mechanical, sorption and permeation properties. Since the membrane properties depend on the processing conditions, the composite membranes production was optimized for a different number of coatings, nano-particles loading and coating concentration. Membrane performance (permeability and selectivity) was studied under different operating conditions (temperature and pressure), and the results showed that the PDMSTFS10%/ LDPE nano-composite membrane is highly suitable for different industrial applications of higher hydrocarbon separations.
Document Type: Thèse de doctorat
Issue Date: 2018
Open Access Date: 22 November 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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