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The effects of chemical modifications on morphology and performance of 6FDA-ODA/NDA hollow fiber membranes for CO2/CH4 separation by Jizhong Ren; Rong Wang; Tai-Shung Chung; Dong Fei Li; Ye Liu is a Engineering article available to read on EtoBox.

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We have studied the rheological characteristics, membrane formation and CO 2 -induced plasticization phenomenon of almost defect-free copoly(4,4 -diphenylene oxide/1,5-naphthalene-2,2 -bis(3,4-dicarboxylphenyl) hexafluoropropane diimide) (6FDA-ODA/NDA) hollow fiber membranes. Experimental results indicate that the dope rheology changes from a Newtonian to non-Newtonian fluid with elasticity when increasing shear rate. The asymmetric 6FDA-ODA/NDA hollow fiber membranes exhibit plasticization if the feed pressure is greater than 75 psi. Chemical cross-linking modifications with p-xylenediamine were conducted at ambient temperature in order to enhance anti-plasticization characteristics of 6FDA-ODA/NDA hollow fiber membranes. Chemical modified membranes show a significant reduction in CO 2 -induced plasticization at least up 550 psi (37.4 atm or 37.9 × 10 6 Pa) if the immersion time is great 1.5 min. However, deteriorations in permeance and permselectivity are clearly observed if the immerse time is greater than 5 min. FTIR spectra confirm that the 6FDA-ODA/NDA polyimide can be chemically cross-linked with p-xylenediamine, while wide-angle X-ray diffraction (WAXD) spectra imply the d-

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Author

Jizhong Ren; Rong Wang; Tai-Shung Chung; Dong Fei Li; Ye Liu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0376-7388)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)