A Novel Time Lag Method for the Analysis of Mixed Gas Diffusion in Polymeric Membranes by On-Line Mass Spectrometry: Method Development and Validation.

0493318 - ÚCHP 2019 RIV NL eng J - Článek v odborném periodiku
Fraga, S. - Monteleone, M. - Lanč, M. - Esposito, E. - Fuoco, A. - Giorno, L. - Pilnáček, K. - Friess, K. - Carta, M. - McKeown, N.B. - Izák, Pavel - Petrusová, Zuzana - Crespo, J. - Braziniha, C. - Jansen, J.C.
A Novel Time Lag Method for the Analysis of Mixed Gas Diffusion in Polymeric Membranes by On-Line Mass Spectrometry: Method Development and Validation.
Journal of Membrane Science. Roč. 561, SEP 1 (2018), s. 39-58. ISSN 0376-7388. E-ISSN 1873-3123
GRANT EU: European Commission(XE) 608490
Institucionální podpora: RVO:67985858
Klíčová slova: gas separation membrane * mixed gas diffusion * time lag method
Obor OECD: Chemical process engineering
Impakt faktor: 7.015, rok: 2018

A novel method to determine the individual diffusion coefficients of gases in a mixture during their permeation through polymeric membranes is described. The method was developed in two independent laboratories, using rubbery Pebax® and glassy Hyflon® AD60X membrane samples as standards, and validated using the Tröger s base containing Polymer of Intrinsic Microporosity, PIMEA-TB. Monitoring of the permeate composition in real time by a quadrupole mass spectrometer allowed the analysis of the permeation transient for gas mixtures. Two operation modes, either with a vacuum in the permeate and a direct connection to the mass spectrometer via a heated restriction, or using a sweeping gas and a heated capillary sample inlet, give excellent agreement with the traditional time lag method for single gases. A complete overview of the method development, identification of the critical parameters, instruments calibration, data elaboration and estimation of the experimental accuracy are provided. Validation with PIM-EA-TB, shows that the method can also successfully detect anomalous phenomena, related to pressure and concentration dependency of the transport properties, physical aging or penetrant-induced dilation. Rapid online analysis of the permeate composition makes the method also very suitable for routine mixed gas permeability measurements.
Trvalý link: http://hdl.handle.net/11104/0286696