Preparation of composite membranes with polyimides and poly (amide-imide)s skin via interfacial condensation for air separation
✍ Scribed by Yaw-Terng Chern; Bae-Shyang Wu
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 215 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Composite membranes were prepared by the interfacial condensation of water-soluble diamines with an organic solvent (dichloromethane)-soluble dicarbomethoxy terephthaloyl chloride or carbomethoxy terephthaloyl chloride on top of a porous aluminum oxide support. The morphology of skin on the composite membranes is different in the two different procedures. The polyimide composite membranes with 40-times coatings provide a high gas permeation rate of oxygen and good permselectivity [a(0 2 /N 2 )]. The composite membrane with the polyimides skin at 40-times coatings had a gas permeation rate of oxygen range from 83 1 10 05 to 130 1 10 05 cm 3 (STP) s 01 cm 02 cmHg 01 , and a permselectivity [a(O 2 /N 2 )] range of 3.57 to 5.60. The composite membrane with poly(amide-imide)s skin at 40-times coatings had a gas permeation rate of oxygen range from 102 1 10 05 to 146 1 10 05 cm 3 (STP) s 01 cm 02 cmHg 01 , and the permselectivity (a(O 2 /N 2 )) range from 3.20 to 4.96.