Green Preparation of Thin Films of Polybenzimidazole on Flat and Hollow Fiber Supports: Application to Hydrogen Separation

Sanchez-Lainez, J. ; Etxeberria-Benavides, M. ; David, O. ; Tellez, C. (Universidad de Zaragoza) ; Coronas, J. (Universidad de Zaragoza)

Resumen: This 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.

Idioma: Inglés

DOI: 10.1002/cssc.202002700

Año: 2021

Publicado en: ChemSusChem 14, 3 (2021), 952-960
ISSN: 1864-5631

Factor impacto JCR: 9.14 (2021)

Categ. JCR: GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY rank: 11 / 47 = 0.234 (2021) - Q1 - T1
Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 30 / 180 = 0.167 (2021) - Q1 - T1

Factor impacto CITESCORE: 14.1 - Materials Science (Q1) - Chemical Engineering (Q1) - Energy (Q1) - Environmental Science (Q1)

Factor impacto SCIMAGO: 2.096 - Energy (miscellaneous) (Q1) - Materials Science (miscellaneous) (Q1) - Chemical Engineering (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/T43-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-AEI-FEDER/MAT2016-77290-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-AEI/PID2019-104009RB-I00-AEI-10.13039-501100011033

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)