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Pervaporative Dehydration of Alcohols by Carbonized Kapton ® Polyimide
Author(s) -
Sungpet A.,
Prapruddivongs C.
Publication year - 2010
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201000056
Subject(s) - polyimide , kapton , carbonization , dehydration , materials science , membrane , pyrolysis , chemical engineering , methanol , pervaporation , chemistry , composite material , organic chemistry , scanning electron microscope , permeation , biochemistry , layer (electronics) , engineering
Kapton® polyimide was carbonized at 873, 1073 and 1273 K with a heating rate of 1, 3 and 5 K min –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.