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- Title
Preparation of defect-free hollow fiber membranes derived from PMDA-ODA polyimide for gas separation.
- Authors
Chen, Mingyang; Yang, Rui; Li, Pei
- Abstract
• For the first time, defect-free PMDA-ODA hollow fiber gas separation membranes are prepared. • Fast spinning of PMDA-ODA hollow fiber is realized by adding LiCl. • A skin layer of 1 μm is obtained after thermal imidization. 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 defect-free 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 , CO 2 , 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 /CO 2 , CO 2 /N 2 and O 2 /N 2 , respectively. These results indicated a dense PMDA-ODA layer of 1 μm. 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.
- Subjects
HOLLOW fibers; SEPARATION of gases; GAS separation membranes; AMIC acids; MEMBRANE separation; CARBON dioxide; HYDROGEN bonding
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2022, Vol 179, p154
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2022.01.017