Characterization of highly selective microporous carbon hollow fiber membranes prepared from a commercial co-polyimide precursor (Journal article)

Favvas, E.P.Kouvelos, E.P.Romanos, G.E.Pilatos, G.I.Mitropoulos, A.C.Kanellopoulos, N.K.


 Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7309
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, H2, CH4, CO2, O2 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 H2 permeance values (8.2 GPU or 2.74 × 10-9 mol/m2•s•Pa) with a highest H 2/CH4 selectivity coefficient of 843 at 373 K. © 2007 Springer Science+Business Media, LLC.
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Subject classification: Carbon fibers
Keywords: Carbon hollow fibers;Co-polyimide precursor;Kinetic selectivity;Permselectivity
URI: http://hdl.handle.net/123456789/7309
Publisher: Δεν υπάρχει πληροφορία
Item type: journalArticle
General Description / Additional Comments: Volume 15, Issue 6, pp. 625-633
http://www.scopus.com/inward/record.url?eid=2-s2.0-55649124122&partnerID=40&md5=4c1141dc2aa28ea41d11063d96d3a4b7
Institute of Physical Chemistry, NCSR Demokritos, 153 10 Agia Paraskevi, Attikis, Greece
Department of Petroleum and Natural Gas Technology, Cavala Institute of Technology, 654 04 St. Lucas, Cavala, Greece
Subject classification: Carbon fibers
???metadata.heal.dateAvailable???: 2015-11-30T13:23:05Z
Item language: en
Item access scheme: free
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Publication date: 2008
Bibliographic citation: Δεν υπάρχει πληροφορία
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, H2, CH4, CO2, O2 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 H2 permeance values (8.2 GPU or 2.74 × 10-9 mol/m2•s•Pa) with a highest H 2/CH4 selectivity coefficient of 843 at 373 K. © 2007 Springer Science+Business Media, LLC.
Publisher: Δεν υπάρχει πληροφορία
Journal name: Journal of Porous Materials
Journal type: peer-reviewed
Appears in Collections:ΑΡΘΡΑ-ΜΕΛΕΤΕΣ

Files in This Item:
There are no files associated with this item.



This item is licensed under a Creative Commons License Creative Commons