Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 449, Issue -, Pages 109-118Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2013.08.026
Keywords
Gas separation; RO membranes; Polyamide; Membrane pre-treatments; Temperature influence
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Funding
- Japan Society for the Promotion of Science, under the Post-doctoral Fellowship for Foreign Researchers [FY2012]
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Thin-film composite reverse osmosis membranes were dried under different membrane pre-treatment procedures and evaluated at increased temperatures by gas separation tests. The obtained permeance and selectivity values indicated the presence of highly-permeable regions in the dry samples of the commercial membranes. Treatment with ethanol-hexane in a solvent exchange process, as well as membrane immersion in t-butanol followed by freeze drying, increased the gas permeance by a factor of 1.8 to 9, and from 1.6 to 3.2, respectively, by comparison with room temperature and oven drying. Nevertheless, a Knudsen-diffusion transport mechanism was dominant after both pre-treatments. The permeation temperature remarkably influenced gas selectivity and permeance, and a maximum He/N-2 selectivity occurred at 150 degrees C with considerable high permeance results, which may suggest the use of polyamide membranes as alternative materials for high-temperature separation processes. The temperature-induced changes in the polymer structure and in the transport of compounds can be explained by Knudsen and activated diffusion mechanisms throughout a highly-permeable regions and a dense polyamide matrix, respectively. (C)) 2013 Elsevier B.V. All rights reserved.
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