Pervaporative dehydration of alcohols by carbonized kaptonฎ polyimide
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Publication Details
Author list: Sungpet A., Prapruddivongs C.
Publisher: Wiley
Publication year: 2010
Journal: Chemical Engineering & Technology (0930-7516)
Volume number: 33
Issue number: 9
Start page: 1537
End page: 1542
Number of pages: 6
ISSN: 0930-7516
eISSN: 1521-4125
Languages: English-Great Britain (EN-GB)
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Abstract
Kaptonฎ polyimide was carbonized at 873, 1073 and 1273Kwith a heating rate of 1, 3 and 5 Kmin-1 and applied to the dehydration of methanol, ethanol and isopropanol by pervaporation. Lowering the heating rate or increasing the carbonization temperature resulted in higher selectivity and a decrease in permeability. X-ray diffraction data revealed that when carbonized at high temperature or with a low heating rate, the membrane had lower interplanar spacing, which corresponded to a reduction in pore size. It was also found that the carbonization temperature had a greater influence on the membrane structure than the heating rate. A comparison between permeability observed from single-component and bi-component feeds indicated that the separation mechanism involved more than molecular sieving alone. ฉ 2010 WILEY-VCH Verlag GmbH & Co.
Keywords
Carbon membranes, Pervaporation, Separation
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