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Effect of feed pressure and long-term separation performance of Pebax-ionic liquid membranes for the recovery of difluoromethane (R32) from refrigerant mixture R410A

Abstract: The R410A refrigerant blend (GWP = 2088), a near azeotropic and equimass mixture of difluoromethane (R32, GWP = 675) and pentafluoroethane (R125, GWP = 3500), has been included in the HFC phase down road map established worldwide. In this context, the recovery of value-added R32 from R410A using membrane technology would be a breakthrough in the refrigeration and air conditioning sector, given that conventional distillation cannot be applied to this separation. For the first time, this work has taken advantage of the combination of ionic liquids and polymeric membranes for the separation of the constituents of the R410A mixture. Results show a remarkable improvement in terms of R32 permeability and R32/R125 selectivity in the composite membranes containing 40 wt % [C2mim][SCN] (R32/R125 up to 14.5) and [C2mim][BF4] (aR32/R125 up to 11.0) with respect to the neat polymer membranes (aR32/R125 up to 6.9). Besides, the long-term stability was successfully tested for 25 days under high pressure conditions (7 and 12 bar), which makes these composite membranes excellent candidates for the development of membrane-based R32 separation and recovery processes.

 Autoría: Pardo F., Zarca G., Urtiaga A.,

 Fuente: Journal of Membrane Science, 2021, 618, 118744

 Editorial: Elsevier

 Fecha de publicación: 15/01/2021

 Nº de páginas: 8

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.memsci.2020.118744

 ISSN: 0376-7388,1873-3123

 Proyecto español: PID2019-105827RB-I00

 Url de la publicación: https://doi.org/10.1016/j.memsci.2020.118744