Modelling of the influence of downstream pressure for highly selective pervaporation
- Resource Type
- Authors
- Quang Nguyen Trong
- Source
- Journal of Membrane Science. 34:165-183
- Subject
- Chromatography
Component (thermodynamics)
Chemistry
Diffusion
Evaporation
Thermodynamics
Flux
Filtration and Separation
Biochemistry
Membrane
Downstream (manufacturing)
Scientific method
General Materials Science
Pervaporation
Physical and Theoretical Chemistry
- Language
- ISSN
- 0376-7388
A model has been developed to describe the influence of downstream pressure on the pervaporation performance of the systems water-tetrahydrofuran-Cuprophan membrane and water-isopropanol-cellulose membrane. In this model, the diffusion coefficient of both permeants is assumed to be proportional to the exponential of the local concentration of the preferentially permeating component in the membrane. The model also includes the evaporation of the permeants from the membrane downstream interface as another rate-limiting step in the process. This model makes it possible to predict the increase of the flux of the non-preferential component permeant of the above systems when the downstream pressure increases. It could be used to simulate systems in which high selectivity for the least volatile component is obtained in pervaporation.