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Effect of air gap on gas permeance/selectivity performance of BTDA‐TDI/MDI copolyimide hollow fiber membranes
Author(s) -
Favvas Evangelos P.,
Papageorgiou Sergios K.,
Nolan John W.,
Stefanopoulos Konstantinos L.,
Mitropoulos Athanasios Ch.
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39677
Subject(s) - permeance , selectivity , membrane , materials science , phase inversion , fiber , spinning , fabrication , polymer chemistry , chemical engineering , analytical chemistry (journal) , chemistry , composite material , chromatography , organic chemistry , medicine , alternative medicine , biochemistry , pathology , engineering , catalysis
Fabrication, morphology evaluation , and permeance/selectivity properties of three asymmetric BTDA‐TDI/MDI copolyimide hollow fiber membranes (HFM s ) are reported. The asymmetric HFM s were spun using the dry/wet phase inversion process. The effect of one of the major spinning parameters, the air gap, on the permeance/selectivity properties of the produced HFM was investigated. Scanning e lectron m icroscopy was used to evaluate the morphological characteristics and the macroscopic structure of the developed HFM. The permeance values of He, H 2 , CH 4 , CO 2 , O 2 , and N 2 gases were measured by the variable pressure method at different feed pressures and temperatures and the permselectivity coefficients were calculated. The higher selectivity values were evaluated for the Μ1 membrane and were found to be 49.33, 2.99, 5.13, 5.57 , and 9.61 for H 2 /CH 4 , O 2 /N 2 , CO 2 /CH 4 , CO 2 /N 2 , and H 2 /CO 2 gas mixtures , respectively. The selectivity experiments of H 2 /CH 4 , CO 2 /CH 4 , and O 2 /N 2 mixtures were performed at 25 ° C. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4490–4499, 2013