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 H2 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, H2, CH4, CO2, O2 and N2 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 H2 permeance values (8.2 GPU or 2.74 × 10−9 mol/m2·s·Pa) with a highest H2/CH4 selectivity coefficient of 843 at 373 K.
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Acknowledgments
The authors would like to thank Dr. Theodore Steriotis for the very important contribution of this paper. The authors would like also to thank the “HYDROCELL–E22” research project of the Greek General Secretariat for Research and Technology and the 04–3–001/6 “Archimedes” Research Project of the Greek Ministry of National Education and Religious Affairs for the support of this work.
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Favvas, E.P., Kouvelos, E.P., Romanos, G.E. et al. Characterization of highly selective microporous carbon hollow fiber membranes prepared from a commercial co-polyimide precursor. J Porous Mater 15, 625–633 (2008). https://doi.org/10.1007/s10934-007-9142-2
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DOI: https://doi.org/10.1007/s10934-007-9142-2