Separation of CO2/N2 by Means of a Carbon Membrane

The permeation and separation performance of an ultramicroporous carbon membrane for separation of CO2/N2 mixtures were investigated. The experiments were conducted using the steady‐state measurement method with pure gases (dead‐end mode) and a CO2/N2 gas mixture (20/80 mol.‐%) (cross‐flow mode) in...

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Bibliographic Details
Published in:Chemical engineering & technology 2012-03, Vol.35 (3), p.508-512
Main Authors: Wall, Y., Braun, G., Kaltenborn, N., Voigt, I., Brunner, G.
Format: Article
Language:English
Subjects:
Carbon membrane
Gas separation
Post combustion
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Summary:The permeation and separation performance of an ultramicroporous carbon membrane for separation of CO2/N2 mixtures were investigated. The experiments were conducted using the steady‐state measurement method with pure gases (dead‐end mode) and a CO2/N2 gas mixture (20/80 mol.‐%) (cross‐flow mode) in the temperature range from 293 K to 363 K and at feed pressures of up to 1.4 MPa and atmospheric pressure on the permeate side. The membrane exhibited a selectivity of about 25 and permeability of about 500 Barrer for CO2 in the mixture with N2. The single‐gas measurements do not reflect the membrane performance correctly. An adsorption‐selective effect is assumed to be the main separation mechanism. Moreover, membrane‐aging effects causing blocking due to pore constrictions through adsorption were observed. These pore constrictions lower the permeability, but they raise the selectivity. Operation at high temperatures leads to a reduction of aging effects. Carbon membranes have proved to be promising candidates for CO2 separation from flue gas streams. The permeation and separation performance of an ultra‐microporous carbon membrane for separation of CO2/N2 mixtures was studied with pure gases and a CO2/N2 gas mixture. The membrane provided high selectivity and permeability for CO2 in the mixture with N2.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201100433