Comparison of pure and mixed gas permeation of the highly fluorinated polymer of intrinsic microporosity PIM-2 under dry and humid conditions: experiment and modelling

Autor: Mariagiulia Longo, Marek Lanč, Elena Tocci, Pavel Izák, Chiara Muzzi, Ondřej Vopička, Tamer Uyar, Karel Friess, Bekir Satilmis, Alessio Fuoco, Maria Penelope De Santo, Marcello Monteleone, Johannes C. Jansen, Elisa Esposito
Přispěvatelé: Satılmış, Bekir, Uyar, Tamer, Kırşehir Ahi Evran Üniversitesi, Sağlık Hizmetleri Meslek Yüksekokulu, Tıbbi Hizmetler ve Teknikler Bölümü
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Journal of Membrane Science
Journal of membrane science
594 (2020). doi:10.1016/j.memsci.2019.117460
info:cnr-pdr/source/autori:A. Fuoco; B. Satilmis; T. Uyar; M. Monteleone; E. Esposito; C. Muzzi; E. Tocci; M. Longo; M.P. De Santo; M. Lanc; K. Friess; O. Vopicka; P. Izák; J.C. Jansen/titolo:Comparison of pure and mixed gas permeation of the highly fluorinated polymer of intrinsic microporosity PIM-2 under dry and humid conditions: Experiment and modelling/doi:10.1016%2Fj.memsci.2019.117460/rivista:Journal of membrane science (Print)/anno:2020/pagina_da:/pagina_a:/intervallo_pagine:/volume:594
DOI: 10.1016/j.memsci.2019.117460
Popis: This manuscript describes the gas separation performance of PIM-2, a partially fluorinated linear copolymer synthesized from 5,5',6,6'-tetrahydroxy-3,3,3',3'-tetramethylspirobisindane (TTSBI) and decafluorobiphenyl (DFBP). As one of the early members of the family of polymers of intrinsic microporosity, it had never been tested as a gas separation membrane because of insufficient mechanical resistance. This has been solved only recently, allowing the preparation of robust self-standing films. Molecular modelling studies demonstrated a high fractional free volume (34%) and an elevated surface area (642 m2 g-1), and the latter is in good agreement with experimental BET results. Pure gas permeabilities measured on a fixed-volume time-lag instrument at 1 bar compare well with the results of mixed separation tests on a variable volume setup from 1-6 bar(a). Molecular modelling and independent sorption measurements on a gravimetric sorption balance both show strong dual-mode sorption behaviour, especially for CO2 and to a lesser extent for CH4. Temperature-dependent pure gas permeation measurements show typical Arrhenius behaviour, with a clear increase in the activation energy for diffusion with the increasing molecular size of the gas, indicating high size-selectivity. This is in agreement with the highly rigid PIM structure, determined by AFM force spectroscopy measurements. The dual-mode behaviour results in a moderate pressure dependence of the CO2 permeability and the CO2/N2 and CO2/CH4 selectivity, all slightly decreasing with increasing pressure. The presence of humidity in the gas stream has a remarkable small effect on the membrane performance, which is probably due to the high fluorine content and the consequently low water vapour solubility in the polymer, as confirmed by gravimetric sorption measurements. The manuscript describes an extensive study on the structure-property relationships in PIM-2. © 2019 Elsevier B.V. European Commission, EC Grantová Agentura Ceské Republiky, GA Ä?R: 18-05484S --Research on biogas upgrading presented in this work was supported by EU structural funding in the frame of Operational Programme Research, Development and Education, project No. CZ.02.1.01./0.0/0.0/17_049/0008419 “COOPERATION”. This work was further supported by the CNR-CAS bilateral agreement 2016–2018 “Innovative polymeric membranes for pervaporation and advanced gas and vapour separations” and by the Czech Science Foundation (grant no. 18-05484S ). Appendix A
Databáze: OpenAIRE
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