Anomalous Phenomena Occurring during Permeation and Sorption of C-1-C-6 Alcohol Vapors in Teflon AF 2400

0396055 - ÚCHP 2014 RIV US eng J - Journal Article
Friess, K. - Jansen, J. C. - Poživil, J. - Hanta, V. - Hynek, V. - Vopička, O. - Zgažar, M. - Bernardo, P. - Izák, Pavel - Drioli, E.
Anomalous Phenomena Occurring during Permeation and Sorption of C-1-C-6 Alcohol Vapors in Teflon AF 2400.
Industrial and Engineering Chemistry Research. Roč. 52, č. 31 (2013), s. 10406-10417. ISSN 0888-5885
R&D Projects: GA ČR GAP106/10/1194
Grant - others:ECSFP(XE) NMP3-SL-2009-228631
Institutional support: RVO:67985858
Keywords : intrinsic microporosity * gas separation * organic vapors
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.235, year: 2013

This paper reports on the anomalous diffusion of C-1-C-6 alcohol vapors in the high-free-volume, amorphous glassy perfluoropolymer Teflon AF 2400. In this material, during time lag measurements, the transient in the pressure increase curve of aliphatic alcohols exhibits a quite unusual behavior, different from the previously reported diffusion of permanent gases and that of other vapors (such as hydrocarbons, acetone, dichloromethane, etc.). In addition, we present a novel method for the treatment of raw sorption kinetic data recorded by a gravimetric sorption apparatus equipped with a calibrated quartz (McBain's) spiral balance. The mentioned treatment allows one to eliminate overlapping mechanical oscillations of the spiral balance (caused by the initial charging of the sample gas/vapor into the evacuated measuring chamber) and successfully reconstruct the real elongation of the spiral caused by gas/vapor sorption into a polymer material. This allows to calculate accurate values of the gas/vapor diffusion coefficients, even from highly noisy sorption data.
Permanent Link: http://hdl.handle.net/11104/0223938