Increase in gas separation selectivity during physical aging of OH-containing polyimide

Gas transport characteristics of new polyimide (PI) containing hydroxyl groups in the diamine moiety for seven permanent gases have been investigated: H 2 , He, O 2 , N 2 , CO, CO 2 , and CH 4 . Changes in the gas separation properties of polyimide during its physical aging over a year have been exp...

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Bibliographic Details
Published in:Petroleum chemistry 2011-12, Vol.51 (7), p.514-518
Main Authors: Rusakova, O. Yu, Alentiev, A. Yu, Kukarkina, N. V.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Permeability
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Summary:Gas transport characteristics of new polyimide (PI) containing hydroxyl groups in the diamine moiety for seven permanent gases have been investigated: H 2 , He, O 2 , N 2 , CO, CO 2 , and CH 4 . Changes in the gas separation properties of polyimide during its physical aging over a year have been experimentally revealed. It has been shown that a slow decrease in the permeability coefficients of H 2 , He, and O 2 in the polyimide physical aging process and a sharp decrease in those of N 2 , CO, CO 2 , and CH 4 lead to an exponential increase in the selectivity of gas separation and a displacement of values in the permeability-selectivity plot beyond the upper limit in the case of the O 2 /N 2 gas pair.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544111070115