Mechanism of gas permeation through polymer membranes. Progress report, June 1, 1979-March 31, 1980
The objective is to assess the validity of a free-volume model of gas permeation through nonporous polymeric membranes (5-7). During the past report period, diffusion and solubility coefficients for CO/sub 2/, C/sub 2/H/sub 4/, and C/sub 3/H/sub 8/ in polyethylene rods have been measured at temperatures from 5/sup 0/ to 35/sup 0/C and at pressures of up to 30 atm. Characteristic free-volume parameters were determined from these data by means of an improved computational technique. The parameters were used to predict permeability coefficients for the transport of the above gases through polyethylene membranes. The theoretical permeability coefficients were found to be in very satisfactory agreement with experimental values obtained from independent permeability measurements. Rates of permeation have also been measured for 50% CO/sub 2/-50% C/sub 2/H/sub 4/, 74.9% CO/sub 2/-25.1% C/sub 2/H/sub 4/, and 50% CO/sub 2/-50% C/sub 3/H/sub 8/ mixtures between 20 and 50/sup 0/C and at pressures of up to 28 atm. The permeability coefficients for the components of the mixtures were found to be higher than those of the pure gases, as predicted by the free-volume model.
- Research Organization:
- Syracuse Univ., NY (USA). Dept. of Chemical Engineering and Materials Science
- DOE Contract Number:
- AS02-78ER05015
- OSTI ID:
- 5214230
- Report Number(s):
- DOE/ER/05015-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
04 OIL SHALES AND TAR SANDS
36 MATERIALS SCIENCE
GASES
PERMEABILITY
MEMBRANES
CARBON DIOXIDE
ETHYLENE
MEMBRANE TRANSPORT
OSMOSIS
POLYMERS
PROPANE
SOLUBILITY
ALKANES
ALKENES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DIFFUSION
FLUIDS
HYDROCARBONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
040201 - Oil Shales & Tar Sands- Site Geology- (-1989)
360400 - Polymers & Plastics- (-1987)