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Parallel pore and surface diffusion of levulinic acid in basic polymeric adsorbents.

Baojian Liu¹, Yiwen Yang, Qilong Ren

¹National Laboratory of Secondary Resources Chemical Engineering, Zhejiang University, Hangzhou 310027, China.

Journal of Chromatography. A

|August 22, 2006

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This study details levulinic acid (LA) adsorption on polymeric materials. Adsorption rates were accurately modeled, revealing concentration-dependent diffusion crucial for adsorbent design.

Area of Science:

Chemical Engineering
Materials Science
Adsorption Science

Background:

Levulinic acid (LA) is a key platform chemical.
Efficient adsorption is vital for LA recovery and purification.
Polymeric adsorbents offer tunable properties for selective uptake.

Purpose of the Study:

To investigate the equilibrium and kinetics of levulinic acid (LA) adsorption.
To evaluate two distinct basic polymeric adsorbents: a highly porous gel (335) and a macroreticular resin (D315).
To model adsorption rates using diffusion models and isotherm equations.

Main Methods:

Batch adsorption experiments were conducted under various conditions.
Adsorption kinetics were analyzed using the parallel pore and surface diffusion model.

Related Experiment Videos

External mass transfer and nonlinear Toth isotherm were incorporated.

Film-pore diffusion model was applied to determine diffusivities.

Main Results:

The parallel pore and surface diffusion model accurately described experimental adsorption rates.
Apparent pore diffusivities for adsorbent 335 approached a constant value, identified as the accurate pore diffusivity.
Pore diffusivity for D315 was estimated from particle porosity.
Surface diffusivities decreased with increasing initial LA concentration for both adsorbents.
The inverse concentration dependence of surface diffusivity correlated with changes in isosteric heat of adsorption.

Conclusions:

The study successfully modeled LA adsorption kinetics on polymeric adsorbents.
Diffusion mechanisms and concentration-dependent surface diffusivity were elucidated.
Findings provide insights for optimizing adsorbent selection and process design for LA recovery.