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Received October 30, 2021
Accepted February 18, 2022
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Copyright © KIChE. All rights reserved.
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Effect of air gap interval on polyvinylidene fluoride hollow fiber membrane spinning for CO2 and CH4 gas separation
1Department of Chemical Engineering, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia 2CO2 Research Centre (CO2RES), Institute of Contaminant Management, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia 3Department of Chemical, Polymer and Composite Materials Engineering, University of Engineering and Technology Lahore (New-Campus), Pakistan
Korean Journal of Chemical Engineering, September 2022, 39(9), 2499-2504(6), 10.1007/s11814-022-1087-2
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Abstract
Improper control of air gap interval during hollow fiber membranes (HFMs) spinning may lead to structural defects such as inner lumen deformations and macrovoids. In the current work, PVDF HFMs were prepared by manipulating air gap intervals at 5, 10, 15, 20, and 25 cm, using dry-wet spinning mechanism. The changes in its properties, including contact angle, mechanical strength, and most importantly the morphological structure that is usually crucial for gas separation performance have been determined. The morphology was evaluated using SEM, and the inner lumen defects of HFMs were reduced with the increment of air gap interval during the spinning process. Subsequently,_x000D_
the CO2 gas permeance was observed to increase from 5 to 15 cm air gap distance and almost constant at 20 cm air gap interval, then increase tremendously beyond this point. Furthermore, CO2/CH4 ideal selectivity was observed to be improved and reached the highest end at PVDF-AG15 and dropped beyond this point. Therefore, varying air gap distance is considered as a practical approach for better gas separation. However, macrovoids will form if the air gap length is overlong. Thus, optimum air gap length during PVDF HFMs spinning is vital for morphology and gas separation performance.
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