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Simulation of hydrogen sulphide absorption in alkaline solution using a packed column.

Mohamed Azizi1, Pierre-François Biard, Annabelle Couvert

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A new simulation tool enhances hydrogen sulfide (H₂S) removal in packed columns. Higher alkalinity, pH, and temperature significantly boost H₂S removal efficiency in alkaline solutions.

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Area of Science:

  • Chemical Engineering
  • Environmental Engineering
  • Process Simulation

Background:

  • Hydrogen sulfide (H₂S) is a toxic gas requiring efficient removal.
  • Packed columns with alkaline solutions are common for H₂S abatement.
  • Mass transfer in H₂S scrubbing is influenced by chemical reactions and operating conditions.

Purpose of the Study:

  • Develop a simulation tool for H₂S removal in packed columns.
  • Investigate the impact of chemical conditions (pH, alkalinity), temperature, and L/G ratio on H₂S removal efficiency.
  • Provide a tool for optimizing H₂S treatment processes.

Main Methods:

  • Developed a countercurrent packed column simulation model.
  • Incorporated mass-transfer enhancement from reversible H₂S reactions with alkaline species.
  • Performed numerical simulations varying key parameters like pH, alkalinity, temperature, and L/G ratio.

Main Results:

  • H₂S removal efficiency increases with liquid-to-gas mass flow rate ratio (L/G), pH, and alkalinity.
  • Temperature surprisingly enhances H₂S removal efficiency.
  • Alkalinity significantly improves removal by enhancing mass transfer and buffering pH changes.

Conclusions:

  • The simulation tool accurately models H₂S removal in packed columns.
  • Optimizing alkalinity, pH, and temperature is crucial for efficient H₂S abatement.
  • The tool aids designers and researchers in understanding and optimizing H₂S treatment systems.