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Outstanding performance of PIM-1 membranes towards the separation of fluorinated refrigerant gases

Abstract: The recycling of depleted high global warming mixtures of fluorinated gases (F-gases) with close-boiling or azeotropic behavior requires advanced separation processes to obtain effectively the pure components. Herein, several types of PIM-1 membranes were tested for the first time towards the separation of hydrofluorocarbons and hydrofluoroolefins, showing extraordinarily high permeability coefficients for the value-added difluoromethane (R-32), up to 4100 barrer, coupled with high selectivity for the F-gas pairs of interest. Additionally, the solubility of selected F-gases in PIM-1 was measured and fitted to the dual-mode and Guggenheim, Anderson and de Boer sorption models. The separation performance of the standard PIM-1 and a highly branched PIM-1 was examined with the mixture R-410A (containing R-32 and pentafluoroethane R-125) to assess the influence of the membrane topology on the mixed-gas permeation properties over time (physical aging). Considering that the branched PIM-1 membrane was the least impacted by the aging phenomena, it was used to recover high purity R-32 (concentration in the permeate side as high as 98.9 vol % was achieved) from refrigerant gas mixtures R-410A and R-454B (mixture of R-32 and R-1234yf) in continuous long-term experiments. Results showed the great potential of PIM-1 membranes for the separation of R-32 from refrigerant mixtures collected from end-of-life equipment.

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 Autoría: Gutiérrez-Hernández S.V., Pardo F., Foster A.B., Gorgojo P., Budd P.M., Zarca G., Urtiaga A.,

 Fuente: Journal of Membrane Science, 2023, 675, 121532

Editorial: Elsevier

 Fecha de publicación: 05/06/2023

Nº de páginas: 9

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.memsci.2023.121532

ISSN: 0376-7388,1873-3123

Proyecto español: PID2019-105827RB-I00

Url de la publicación: https://doi.org/10.1016/j.memsci.2023.121532