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<p>This study investigates the absorption of carbon dioxide (CO<sub>2</sub>) into methanol, a widely used physical solvent for CO<sub>2</sub> separation from gas streams. Experiments were conducted at 2.0 ± 0.1&#xa0;°C using the gradual pressure decay method to characterize the absorption behavior. A comprehensive mathematical model was developed based on the coupled continuity, species transport, and the momentum equations, with the Boussinesq approximation employed to simplify the momentum formulation. The governing equations were solved subject to appropriate initial and boundary conditions, and the molecular diffusion coefficient and volumetric expansion coefficient were simultaneously adjusted to achieve optimal agreement with experimental measurements. The values minimizing the absolute deviation between model predictions and experimental data were identified as the effective molecular diffusion and volumetric expansion coefficients of CO<sub>2</sub> in methanol at 2.0 ± 0.1&#xa0;°C. The results indicate that the molecular diffusion coefficient remains approximately constant at <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:3.3\times\:{10}^{-9}\text{\hspace{0.17em}}{\text{m}}^{2}\text{\hspace{0.17em}}{\text{s}}^{-1}\)</EquationSource> </InlineEquation>&#xa0;across the investigated pressure range, whereas the volumetric expansion coefficient exhibits a proportional dependence on the applied pressure gradient. These findings highlight the coupled influence of molecular diffusion and solutal natural convection on CO<sub>2</sub> absorption dynamics. Furthermore, temporal and spatial analyses of concentration fields and velocity components within the liquid column provide detailed insights into fluid motion and mass transfer mechanisms at different stages of the absorption process.</p>

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Evaluation of mass transfer parameters in the Co2–methanol system accounting for solutal natural convection via the pressure decay method

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Ali Samadi,
  • Shima Azizi,
  • Somayeh Tourani,
  • S. M. Peyghambarzadeh

摘要

This study investigates the absorption of carbon dioxide (CO2) into methanol, a widely used physical solvent for CO2 separation from gas streams. Experiments were conducted at 2.0 ± 0.1 °C using the gradual pressure decay method to characterize the absorption behavior. A comprehensive mathematical model was developed based on the coupled continuity, species transport, and the momentum equations, with the Boussinesq approximation employed to simplify the momentum formulation. The governing equations were solved subject to appropriate initial and boundary conditions, and the molecular diffusion coefficient and volumetric expansion coefficient were simultaneously adjusted to achieve optimal agreement with experimental measurements. The values minimizing the absolute deviation between model predictions and experimental data were identified as the effective molecular diffusion and volumetric expansion coefficients of CO2 in methanol at 2.0 ± 0.1 °C. The results indicate that the molecular diffusion coefficient remains approximately constant at \(\:3.3\times\:{10}^{-9}\text{\hspace{0.17em}}{\text{m}}^{2}\text{\hspace{0.17em}}{\text{s}}^{-1}\)  across the investigated pressure range, whereas the volumetric expansion coefficient exhibits a proportional dependence on the applied pressure gradient. These findings highlight the coupled influence of molecular diffusion and solutal natural convection on CO2 absorption dynamics. Furthermore, temporal and spatial analyses of concentration fields and velocity components within the liquid column provide detailed insights into fluid motion and mass transfer mechanisms at different stages of the absorption process.