Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 326, Issue 1, Pages 222-233Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2008.10.005
Keywords
Pervaporation; Dehydration; Dual-layer hollow fiber; Anti-swelling; Polyamide-imide
Categories
Funding
- A-Star [R-398-000-044-305]
- NUS [R-279-000-249-646]
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To circumvent the common swelling and deteriorated performance of integral asymmetric hollow fiber membranes for pervaporation dehydration, we have developed novel polyamide-imide (PAI)/polyetherimide (PEI) hollow fiber membranes with synergized performance with the aid of dual-layer spinning technology. Dehydration of C1-C4 alcohols has been conducted and the orders of their fluxes and permeances have been analyzed. The hollow fibers spun at 2 cm air gap and annealed at 75 degrees C exhibit the highest pervaporation performance: separation factors for t-butanol/water and isobutanol/water binary systems are greater than 50,000 with flux more than 700 g/m(2) h. A comparison with literature data shows that the newly developed membranes outperform most other polymeric membranes for the dehydration of IPA and butanols. The dual-layer hollow fiber membranes also exhibit good long-term stability up to 200 h. The superior performance can be attributed to (1) the balanced properties of PAI as the selective layer for dehydration pervaporation; (2) the low water uptake and less swelling characteristic of the PEI supporting layer; and (3) the desirable membrane morphology consisting of a fully porous inner layer, a porous interface, and an ultrathin dense-selective outer skin. (C) 2008 Elsevier B.V. All rights reserved.
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