Investigation on the transport mechanism of pervaporation
Date Issued
1999
Date
1999
Author(s)
DOI
882214E002011
Abstract
The present research explores the
permeation behavior of ethanol and water
through membranes in pervaporation,
vapor permeation, and liquid permeation.
The materials used to prepare the
membranes are TPX, polyurethane, and
Nylon-4, possessing different swelling
characteristics in ethanol-water solution. The results of pervaporation reveal that
the permeability of ethanol through the
membranes is strongly dependent on the
ethanol concentration in the feed. The
dependence can be well explained by the
swelling characteristics of the three
membranes. However, to account for the
behavior of water permeability,
clustering effect of water should also be
considered besides swelling
characteristics. The data from vapor and
liquid permeation also indicate that both
swelling characteristics and water
clustering should be taken into account to
describe the transport of ethanol and
water in membranes. In addition, the data
suggest that, for TPX membranes, the
feed penetrates the membrane in vapor
form during pervaporation, and for PU
and Nylon-4 membranes, both liquid and
vapor zones can be found in membranes
during pervaporation. Staining
experiments were performed to provide
direct evidence for the proposed
mechanism above.
Subjects
pervaporation
vapor and liquid permeations
swelling
membranes
Publisher
臺北市：國立臺灣大學化學工程學系暨研究所
Type
report
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