doi:10.1002/cssc.202002700engSanchez-Lainez, J.Etxeberria-Benavides, M.David, O.Tellez, C.Coronas, J.Green Preparation of Thin Films of Polybenzimidazole on Flat and Hollow Fiber Supports: Application to Hydrogen SeparationART-2021-121608This work shows the preparation of thin films, with thickness from 70 nm to 1 mu m, of meta-polybenzimidazole (m-PBI) on polyimide P84 supports. Ethanolic solutions of m-PBI were used to coat flat and hollow fiber supports of asymmetric P84 with m-PBI in a process where the coating and drying was performed at room temperature. A solution of NaOH in EtOH allowed the dissolution of the m-PBI powder, providing the perfect coating solution to build thin films of m-PBI without damaging the polymeric support. It also meant a green alternative, avoiding the use of toxic solvents, such as dimethylacetamide. The resulting membranes have been tested for the separation of H-2 mixtures at high temperature at different setups to allow checking their reproducibility. With 100 nm thickness the membranes showed their best gas separation performance. For flat membranes at 180 degrees C and 3 bar feed pressure a H-2 permeance of 48.5 GPU was obtained, with respective H-2/CO2 and H-2/N-2 selectivities of 33.3 and 55.8. Besides, the hollow fibers under a feed pressure of 6 bar and tested at the same temperature showed near 90 GPU of H-2 with a H-2/CO2 selectivity of 13.5 in the one-fiber module and over 39 GPU of H-2 with a H-2/CO2 selectivity of 20.2 in the five-fiber module. Finally, the stability of the membranes was proved for 22 days at 180 degrees C.2021http://zaguan.unizar.es/record/10902510.1002/cssc.202002700http://zaguan.unizar.es/record/109025oai:zaguan.unizar.es:109025info:eu-repo/grantAgreement/ES/DGA-FSE/T43-17Rinfo:eu-repo/grantAgreement/ES/MINECO-AEI-FEDER/MAT2016-77290-Rinfo:eu-repo/grantAgreement/ES/MINECO-AEI/PID2019-104009RB-I00-AEI-10.13039-501100011033ChemSusChem 14, 3 (2021), 952-960All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess