NDLI: Characterization of highly selective microporous carbon hollow fiber membranes prepared from a commercial co-polyimide precursor

Content Provider	Springer Nature Link
Author	Favvas, E. P. Kouvelos, E. P. Romas, G. E. Pilatos, G. I. Mitropoulos, A. Ch. Kanellopoulos, N. K.
Copyright Year	2007
Abstract	In this work, the preparation of gas separating carbon hollow fiber membranes based on a 3,3′4,4′- benzophenone tetracarboxylic dianhydride and 80% methylphenylene-diamine + 20% methylene diamine co-polyimide precursor (BTDA-TDI/MDI, Ρ84 Lenzing GmbH), their permselectivity properties as well as details of the carbon nanostructure are reported. Hollow fibers were initially prepared by the dry/wet phase inversion process in a spinning set-up, while the spinning dope consisted of P84 as polymer and NMP as solvent. The developed polymer hollow fibers were further carbonized in nitrogen at temperatures up to 1173 K. Thermogravimetric analysis was used to investigate the weight loss during the carbonization process. The nitrogen, methane and carbon dioxide adsorption capacity of the prepared materials was determined gravimetrically at 273 and 298 K and hydrogen adsorption experiments were performed at 77 K up to 1 bar. Scanning electron microscopy was used to elucidate the morphological characteristics and the nanostructure while H$_{2}$ sorption at 77 K was applied to evaluate the microporosity of the developed carbon hollow fiber membranes. In all cases, the permeability (Barrer) of He, H$_{2}$, CH$_{4}$, CO$_{2}$, O$_{2}$ and N$_{2}$ were measured at atmospheric pressure and temperatures 313, 333 and 373 K and were found higher than those of the precursor. Moreover, the calculated permselectivity values were significantly improved. The developed carbon fibers exhibit rather low H$_{2}$ permeance values (8.2 GPU or 2.74 × 10$^{−9}$ mol/m$^{2}$·s·Pa) with a highest H$_{2}$/CH$_{4}$ selectivity coefficient of 843 at 373 K.
Starting Page	625
Ending Page	633
Page Count	9
File Format	PDF
ISSN	13802224
Journal	Journal of Porous Materials
Volume Number	15
Issue Number	6
e-ISSN	15734854
Language	English
Publisher	Springer US
Publisher Date	2007-07-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Co-polyimide precursor Carbon hollow fibers Permselectivity Kinetic selectivity Physical Chemistry Characterization and Evaluation of Materials Catalysis
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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