TY - JOUR
T1 - A novel time lag method for the analysis of mixed gas diffusion in polymeric membranes by on-line mass spectrometry: method development and validation
AU - Fraga, S. C.
AU - Monteleone, M.
AU - Lanč, M.
AU - Esposito, E.
AU - Fuoco, A.
AU - Giorno, L.
AU - Pilnáček, K.
AU - Friess, K.
AU - Carta, M.
AU - McKeown, N. B.
AU - Izák, P.
AU - Petrusová, Z.
AU - Crespo, J. G.
AU - Brazinha, C.
AU - Jansen, J. C.
N1 - European Union's Seventh Framework Program (FP7/2007-2013) under Grant agreement no. 608490.
project M4CO<INF>2</INF>.
CNR/FCT Italian/Portuguese Bilateral Project 2015-2016 "Advanced studies of the transport properties and gas separation by polymers of intrinsic microporosity (PIMs) and Ionic Liquid Gel Membranes via novel methods" and the CNR-CAS Bilateral Agreement 2016-2018 "Innovative polymeric membranes for pervaporation and advanced gas and vapour separations".
PY - 2018/9/1
Y1 - 2018/9/1
N2 - 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, PIM-EA-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.
AB - 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, PIM-EA-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.
KW - Diffusion coefficient
KW - Gas separation membrane
KW - Mixed gas diffusion
KW - On-line mass spectrometry
KW - Time lag method
UR - http://www.scopus.com/inward/record.url?scp=85047365249&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2018.04.029
DO - 10.1016/j.memsci.2018.04.029
M3 - Article
AN - SCOPUS:85047365249
VL - 561
SP - 39
EP - 58
JO - Journal of Membrane Science
JF - Journal of Membrane Science
SN - 0376-7388
ER -