Recovery of free volume in PIM-1 membranes through alcohol vapor treatment

Abstract

Physical aging is currently a major obstacle for the commercialization of PIM-1 membranes for gas separation applications. A well-known approach to reversing physical aging effects of PIM-1 membranes at laboratory scale is soaking them in lower alcohols, such as methanol and ethanol. However, this procedure does not seem applicable at industrial level, and other strategies must be investigated. In this work, a regeneration method with alcohol vapors (ethanol or methanol) was developed to recover permeability of aged PIM-1 membranes, in comparison with the conventional soaking-in-liquid approach. The gas permeability and separation performance, before and post the regeneration methods, were assessed using a binary mixture of CO₂ and CH₄ (1:1, v:v). Our results show that an 8-hour methanol vapor treatment was sufficient to recover the original gas permeability, reaching a CO₂ permeability>7000 barrer.

Graphical abstract

Keywords

polymer of intrinsic microporosity (PIM) / PIM-1 / physical aging / gas separation / vapor-phase regeneration

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Acknowledgements

Faiz Almansour is grateful to the Department of Research & Development, Saudi Aramco for funding and supporting his Ph.D. studies. M. Alberto is grateful to EPSRC for funding under the research grant number EP/S032258/1 and R. Bhavsar to EPSRC under grant number EP/M001342/1.Open AccessƒThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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