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Title: Transport and morphological characteristics of polyetherimide-based carbon molecular sieve membranes

Abstract

A new class of carbon molecular sieve membranes (CMSMs) has been prepared by carbonization of polyetherimide-coated mesoporous tubular supports. The membranes show higher permeance and better separation factors than other supported CMSMs reported in the literature for the CO{sub 2}/CH{sub 4} and H{sub 2}/CH{sub 4} binary mixtures as well as for the CO{sub 2}H{sub 2}/CH{sub 4} ternary mixture. CO{sub 2}/CH{sub 4} separation factors as high as 145 for the equimolar binary and 155 for the ternary mixture were obtained with a CO{sub 2} permeance about 0.15 (cm{sup 3}/cm{sup 2}{center_dot}psi{center_dot}min). The corresponding H{sub 2}/CH{sub 4} separation factors for the equimolar binary and ternary mixtures were 68 and 50, respectively, with a H{sub 2} permeance of 0.13 (cm{sup 3}/cm{sup 2}{center_dot}psi{center_dot}min). The membrane also shows good stability when tested with CO{sub 2} and Ar single gases, as well as with an equimolar mixture of CO{sub 2}/CH{sub 4}. To study the mechanism of permeation and separation in CMSMs, tests with single gases as well as with binary and ternary mixtures were performed at different temperatures, transmembrane pressure differences, and feed compositions. Elemental analysis, scanning electron microscopy, and gas adsorption were also employed to study the morphology of the resulting membranes. Elemental analysis shows thatmore » although the structure consists mostly of carbon, it also still contains oxygen, nitrogen and hydrogen. Scanning electron microscopy of the cross section of the carbonized membrane shows that the carbonized layer lies essentially within the mesoporous {gamma}-alumina layer, a result also verified by N{sub 2} adsorption analysis at 77 K. The experimental data were compared with simulation results with the same mixtures using a nonequilibrium molecular dynamics method.« less

Authors:
; ; ;  [1]
  1. Univ. of Southern California, Los Angeles, CA (United States). Dept. of Chemical Engineering
Publication Date:
OSTI Identifier:
697171
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 38; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 03 NATURAL GAS; MOLECULAR SIEVES; MEMBRANES; FABRICATION; PERMEABILITY; METHANE; CARBON DIOXIDE; HYDROGEN; SEPARATION PROCESSES; MORPHOLOGY; ENERGY EFFICIENCY

Citation Formats

Sedigh, M.G., Xu, L., Tsotsis, T.T., and Sahimi, M. Transport and morphological characteristics of polyetherimide-based carbon molecular sieve membranes. United States: N. p., 1999. Web. doi:10.1021/ie9806592.
Sedigh, M.G., Xu, L., Tsotsis, T.T., & Sahimi, M. Transport and morphological characteristics of polyetherimide-based carbon molecular sieve membranes. United States. doi:10.1021/ie9806592.
Sedigh, M.G., Xu, L., Tsotsis, T.T., and Sahimi, M. Wed . "Transport and morphological characteristics of polyetherimide-based carbon molecular sieve membranes". United States. doi:10.1021/ie9806592.
@article{osti_697171,
title = {Transport and morphological characteristics of polyetherimide-based carbon molecular sieve membranes},
author = {Sedigh, M.G. and Xu, L. and Tsotsis, T.T. and Sahimi, M.},
abstractNote = {A new class of carbon molecular sieve membranes (CMSMs) has been prepared by carbonization of polyetherimide-coated mesoporous tubular supports. The membranes show higher permeance and better separation factors than other supported CMSMs reported in the literature for the CO{sub 2}/CH{sub 4} and H{sub 2}/CH{sub 4} binary mixtures as well as for the CO{sub 2}H{sub 2}/CH{sub 4} ternary mixture. CO{sub 2}/CH{sub 4} separation factors as high as 145 for the equimolar binary and 155 for the ternary mixture were obtained with a CO{sub 2} permeance about 0.15 (cm{sup 3}/cm{sup 2}{center_dot}psi{center_dot}min). The corresponding H{sub 2}/CH{sub 4} separation factors for the equimolar binary and ternary mixtures were 68 and 50, respectively, with a H{sub 2} permeance of 0.13 (cm{sup 3}/cm{sup 2}{center_dot}psi{center_dot}min). The membrane also shows good stability when tested with CO{sub 2} and Ar single gases, as well as with an equimolar mixture of CO{sub 2}/CH{sub 4}. To study the mechanism of permeation and separation in CMSMs, tests with single gases as well as with binary and ternary mixtures were performed at different temperatures, transmembrane pressure differences, and feed compositions. Elemental analysis, scanning electron microscopy, and gas adsorption were also employed to study the morphology of the resulting membranes. Elemental analysis shows that although the structure consists mostly of carbon, it also still contains oxygen, nitrogen and hydrogen. Scanning electron microscopy of the cross section of the carbonized membrane shows that the carbonized layer lies essentially within the mesoporous {gamma}-alumina layer, a result also verified by N{sub 2} adsorption analysis at 77 K. The experimental data were compared with simulation results with the same mixtures using a nonequilibrium molecular dynamics method.},
doi = {10.1021/ie9806592},
journal = {Industrial and Engineering Chemistry Research},
number = 9,
volume = 38,
place = {United States},
year = {1999},
month = {9}
}