Research Article

Separation of CO2/N2 by Means of a Carbon Membrane

  1. Y. Wall1,
  2. G. Braun1,*,
  3. N. Kaltenborn2,
  4. I. Voigt2,
  5. G. Brunner3

Article first published online: 6 FEB 2012

DOI: 10.1002/ceat.201100433

Issue

Chemical Engineering & Technology

Chemical Engineering & Technology

Special Issue: Efficient Carbon Capture for Coal Power Plants

Volume 35, Issue 3, pages 508–512, March, 2012

Additional Information

How to Cite

Wall, Y., Braun, G., Kaltenborn, N., Voigt, I. and Brunner, G. (2012), Separation of CO2/N2 by Means of a Carbon Membrane. Chem. Eng. Technol., 35: 508–512. doi: 10.1002/ceat.201100433

Author Information

  1. 1

    Cologne University of Applied Sciences, Cologne, Germany

  2. 2

    Fraunhofer Institute for Ceramic Technologies and Systems, IKTS, Hermsdorf, Germany

  3. 3

    Hamburg University of Technology (TUHH), Hamburg, Germany

*Cologne University of Applied Sciences, Cologne, Germany

Publication History

  1. Issue published online: 27 FEB 2012
  2. Article first published online: 6 FEB 2012
  3. Manuscript Accepted: 5 DEC 2011
  4. Manuscript Revised: 10 OCT 2011
  5. Manuscript Received: 15 AUG 2011

Funded by

  • Federal Ministry of Education and Research
  • Fraunhofer IKTS

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Keywords:

  • Carbon membrane;
  • Gas separation;
  • Post combustion

Abstract

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.

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