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Modeling, Simulation, and Membrane Wetting Estimation in Gas-Liquid Contacting Processes Including Shell-Side

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Summary

This study demonstrates high CO2 removal and CH4 recovery for biogas upgrading using a membrane contactor with diethanolamine. Optimal flow rates were identified, and a correlation was developed for predicting CO2 removal efficiency.

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Area of Science:

  • Chemical Engineering
  • Environmental Science
  • Separation Processes

Background:

  • Biogas upgrading is crucial for utilizing methane (CH4) as a renewable energy source.
  • Carbon dioxide (CO2) removal is a key step in biogas purification.
  • Membrane contactors offer a promising technology for gas-liquid separations.

Purpose of the Study:

  • To assess mass transfer models for CO2 removal in a gas-liquid membrane contactor.
  • To optimize operating conditions for efficient CO2 capture and CH4 recovery.
  • To develop a predictive correlation for CO2 removal based on experimental data.

Main Methods:

  • Experiments were conducted in a 3 M Liqui-Cel MM-1.7 × 5.5 membrane module.
  • An aqueous solution of 0.25 M diethanolamine (DEA) was used as the solvent.
  • Gas and liquid flow rates were systematically varied to evaluate CO2 removal and CH4 recovery.

Main Results:

  • CO2 removal efficiencies exceeding 67% and reaching 100% were achieved.
  • Optimal biogas and solvent flow rates were identified for maximum performance.
  • A correlation was developed to interpolate CO2 removal based on flow rates.
  • Wetting values were found to be dependent on liquid flow rate and less sensitive to gas flow rate.

Conclusions:

  • The study validates mass transfer models and provides insights into membrane wetting phenomena.
  • The developed correlation aids in predicting CO2 removal efficiency for biogas upgrading.
  • The choice of shell-side correlation significantly impacts the analysis of mass transfer and wetting.