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Amine‐impregnated natural zeolite as filler in mixed matrix membranes for CO 2 /CH 4 separation
Author(s) -
Castruitade León Griselda,
YeverinoMiranda Claudia Y.,
MontesLuna Angel de J.,
MeléndezOrtiz Hector Iván,
AlvaradoTenorio German,
GarcíaCerda Luis Alfonso
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48286
Subject(s) - polysulfone , zeolite , barrer , thermogravimetric analysis , membrane , materials science , fourier transform infrared spectroscopy , polyethylenimine , chemical engineering , clinoptilolite , selectivity , adsorption , ethanolamine , amine gas treating , gas separation , desorption , polymer chemistry , nuclear chemistry , chemistry , organic chemistry , catalysis , transfection , biochemistry , engineering , gene
Flat mixed matrix membranes (MMMs) comprising polysulfone and clinoptilolite‐type natural zeolite were prepared by casting. Zeolite was modified with three alkylamines: ethanolamine (EA), bis(2‐hydroxypropyl)amine (BHPA), and polyethylenimine (PEI) by the impregnation method. Impregnated zeolite samples were characterized by X‐ray diffraction, Fourier transform infrared spectroscopy, and N 2 adsorption–desorption. The alkylamine loading extent determined by thermogravimetric analysis was 5.2, 4.8, and 8.5% for EA, BHPA, and PEI, respectively. Analyses of MMMs showed that the incorporation of impregnated zeolite affected the glass‐transition temperature ( T g ) and mixed‐gas transport properties. In this regard, a decreasing trend of the T g values from 185.5 °C for the polymeric membrane up to 176.6 °C for Clino‐EA‐based MMM was recorded. In addition, the gas separation performance was evaluated at two different feed pressures. At 50 psi, MMMs showed an enhancement up to 30% on the CO 2 permeability (22.79 Barrer) and 55% on the CO 2 /CH 4 selectivity (45.78) in comparison with the polymeric membrane (CO 2 permeability 17.34 Barrer; CO 2 /CH 4 selectivity 29.38). These values varied depending on the alkylamine, BHPA being the most selective. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48286.