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

Faiz Almansour, Monica Alberto, Rupesh S. Bhavsar, Xiaolei Fan, Peter M. Budd, Patricia Gorgojo

Research output: Journal PublicationArticlepeer-review

11 Citations (Scopus)


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. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)872-881
Number of pages10
JournalFrontiers of Chemical Science and Engineering
Issue number4
Publication statusPublished - Aug 2021
Externally publishedYes


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

ASJC Scopus subject areas

  • Chemical Engineering (all)


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