Abstract
Vapor permeation (VaP) using cellophane membrane was compared with pervaporation (PV) for ethanol-water mixtures under isothermal conditions (Mode I). The selectivity of VaP was higher than that of PV through whole feed composition, while the permeation rate of VaP was lower than that of PV. It was observed that the membrane in PV was more swollen than in VaP. In the case (Mode II) which feed vapor was superheated in VaP under keeping downstream pressure constant, the selectivity increased remarkably and the permeation rate decreased. In another case (Mode III) which downstream temperature near the membrane was dropped and the temperature gradient was generated through the membrane in VaP, the permeation rate increased and the selectivity decreased. The influence of temperature to the permeation rate could be expressed by the Arrhenius' correlation only for Mode I. With regard to the influence of downstream pressure, the selectivity of Mode II showed only a slight decrease with downstream pressure, not so much decrease as the usual condition (Mode I).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
