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Statistical analysis of CO2/N2 gas separation permeance and selectivity using taguchi method.

Ali A Abdulabbas1,2, Thamer J Mohammed2, Tahseen A Al-Hattab3

  • 1Department of Chemical Engineering and Petroleum Industries, Al-Amarah University College, Maysan, Iraq.

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|April 16, 2024
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Summary

This study optimized polysulfone membranes for carbon dioxide (CO2) separation from flue gases using a dry-wet phase inversion method. Optimal casting parameters were identified to enhance CO2 permeance and selectivity.

Keywords:
Flue gasesOptemaztion parametersPolysulfone (PSF)Solvent ratioTaguchi

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Carbon dioxide (CO2) separation from industrial flue gases is critical for mitigating climate change.
  • Membrane technology presents a viable and energy-efficient alternative to traditional gas separation methods.
  • Polysulfone (PSF) membranes are widely investigated for gas separation due to their favorable properties.

Purpose of the Study:

  • To investigate the effect of casting parameters on polysulfone membrane performance for CO2 separation.
  • To optimize the fabrication process for enhanced CO2 permeance and CO2/N2 selectivity.
  • To establish a correlation between casting conditions, membrane morphology, and separation performance.

Main Methods:

  • Polysulfone (PSF) membranes were prepared via a dry-wet phase inversion technique using N-methyl-2-pyrrolidone (NMP) and tetrahydrofuran (THF).
  • Casting parameters including PSF concentration, THF/NMP solvent ratio, and evaporation time were systematically varied.
  • Scanning Electron Microscopy (SEM) was used for morphological characterization.
  • Taguchi statistical analysis was employed to analyze experimental data and optimize performance metrics (CO2 permeance and CO2/N2 selectivity).

Main Results:

  • The prepared membranes exhibited CO2 permeance ranging from 1.25 to 8.47 GPU and CO2/N2 selectivity between 2.95 and 8.92.
  • Taguchi analysis revealed that PSF concentration had the most significant impact on membrane performance, followed by solvent ratio and evaporation time.
  • The optimal casting parameters were determined as 20 wt% PSF concentration, a 17.5/82.5 THF/NMP ratio, and a 4-minute evaporation time.

Conclusions:

  • The study successfully optimized polysulfone membrane fabrication for efficient CO2 separation.
  • The findings highlight the critical role of casting parameters in tailoring membrane morphology and performance.
  • The optimized membranes offer a promising solution for CO2 capture from flue gases.