首页|Preparation of defect-free hollow fiber membranes derived from PMDA-ODA polyimide for gas separation
Preparation of defect-free hollow fiber membranes derived from PMDA-ODA polyimide for gas separation
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Since PMDA-ODA polyimide is insoluble, its soluble precursor PMDA-ODA poly (amic acid) (PAA) is used to prepare hollow fiber membranes (HFMs). Due to the existence of -CO-NH- and -COOH groups, PAA is subject to form hydrogen bonds with water and consequently leads to a very slow phase inversion rate during the non-solvent induced phase inversion process. Therefore, the hollow fiber spinning has to be carried out with a low take-up speed that limits the productivity. In this paper, we increased the take-up speed of PAA hollow fiber to 60 m/min by simply adding LiCl into polymer dope. Moreover, an integrally skinned defectfree PMDA-ODA hollow fiber membrane was obtained at the high take-up speed where the gas permeances were 6.8 +/- 0.7, 2.2 +/- 0.2, 0.4 +/- 0.04 and 0.07 +/- 0.01 GPU for H-2, CO2, O-2 and N-2, respectively, with an ideal selectivity of 3.1 +/- 0.3, 31 +/- 3.0 and 5.7 +/- 0.6 for H-2/CO2, CO2/N-2 and O-2/N-2, respectively. These results indicated a dense PMDA-ODA layer of 1 mu m. To our best knowledge, this is the first time that a defect-free hollow fiber membrane for gas separation is prepared based on PMDA-ODA. (C) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.
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