NEXARTM-coated hollow fibers for air dehumidification

Abstract
Air conditioning is one of the essential requirements for households as well as work stations. Dehumidification in air conditioning is the highest energy-consuming component, where membranes could play a crucial role. In this work, we propose the coating of NEXARTM, a commercial pentablock copolymer in tetrahydrofuran on polyetherimide hollow fiber support for separation of water vapor from humidified air. The block copolymer in tetrahydrofuran forms a lamellar/parallel cylindrical structure separated by equidistance during the morphological transformation process giving its unique characteristics with higher water vapor transfer efficiency. Both vacuum and sweep gas modes of membrane dehumidification strategies are investigated along with the detailed study of the morphological transformation process under a controlled environment, which is supported by comprehensive scanning electron microscopic and atomic force microscopic imaging. The membrane has shown water vapor permeance up to 9089 GPU with water vapor to nitrogen selectivity up to 3870. The membrane can reduce the relative humidity from 80% to 41% proving one of the competitive materials for membrane dehumidification.

Citation
Upadhyaya, L., Gebreyohannes, A. Y., Akhtar, F. H., Falca, G., Musteata, V., Mahalingam, D. K., … Nunes, S. P. (2020). NEXARTM-coated hollow fibers for air dehumidification. Journal of Membrane Science, 118450. doi:10.1016/j.memsci.2020.118450

Acknowledgements
This work was sponsored by King Abdullah University of Science and Technology (KAUST), grants REP/1/3988-06-01 and REP/1/3988-09-01. The authors thank Prof. Klaus-Viktor Peinemann, Dr. Jiangtao Li, Prof. William Worek, Prof. Omar Abdel Aziz and Dr. Rory Jordan for valuable discussion in the frame of the KAUST Cooling Initiative.

Publisher
Elsevier BV

Journal
Journal of Membrane Science

DOI
10.1016/j.memsci.2020.118450

Additional Links
https://linkinghub.elsevier.com/retrieve/pii/S0376738820310279

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