Exclusion and tortuosity effects for alcohol/water separation by zeolite-filled PDMS membranes. [polydimethylsiloxane]
- Univ. of Twente (Netherlands)
A resistance model has been developed to describe the increased pervaporation flux and selectivity for the separation of ethanol/water mixtures with silicalite-filled silicone rubber (SR) membranes as compared to unfilled SR membranes. The model interprets the increased component flux for ethanol in terms of an increasing ethanol permeability of the membrane. Membrane permeability is given as a function of rubber and silicalite permeabilities and of the silicalite content of the membrane. It is shown that silicalite permeability varies with the type of alcohol and the alcohol concentration in the feed mixture. In the series methanol, ethanol propanol, and butanol, the alcohol permeability of silicalite varies with the length of the alcohol molecule, the lowest permeability being found for butanol. In the presence of propanol an butanol, the silicalite particles are impermeable to water and obstruct water transport through the membrane.
- OSTI ID:
- 5426924
- Journal Information:
- Separation Science and Technology; (United States), Vol. 26:4; ISSN 0149-6395
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BUTANOLS
SEPARATION PROCESSES
ETHANOL
MEMBRANES
PERFORMANCE TESTING
METHANOL
PROPANOLS
EQUATIONS
EXPERIMENTAL DATA
FLOW MODELS
MEMBRANE TRANSPORT
PERMEABILITY
QUANTITY RATIO
SILICONES
SILOXANES
THICKNESS
WATER
ZEOLITES
ALCOHOLS
DATA
DIMENSIONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MATHEMATICAL MODELS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
TESTING
090900* - Biomass Fuels- Processing- (1990-)