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Silicalite/poly(dimethylsiloxane) nanocomposite pervaporation membranes for acetic acid/water separation

Published online by Cambridge University Press:  31 January 2011

Shih-Yuan Lu*
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 30043, Republic of China
Hsiang-Yuan Huang
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 30043, Republic of China
Kwen-Hua Wu
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu, Taiwan 30043, Republic of China
*
a) Address all correspondence to this author. e-mail: sylu@che.nthu.edu.tw
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Abstract

Composite separation membranes of poly(dimethylsiloxane) (PDMS) containing well-dispersed silicalite particles of 50 nm were successfully prepared and applied to the preferential pervaporation of acetic acid over water. The nanocomposite membranes showed improvement on both separation factor and permeation flux for the pervaporation process, as compared to plain PDMS membranes and composite membranes containing silicalite particles of 5 μm. The improvement can be attributed to higher readily accessible specific surface area and higher sorption selectivity toward acetic acid of the nano-size silicalite particles. Improvement on membrane thermal stability was also acquired through incorporation of nano-size silicalite particles.

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Copyright
Copyright © Materials Research Society 2001

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Silicalite/poly(dimethylsiloxane) nanocomposite pervaporation membranes for acetic acid/water separation
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