Simultaneous determination of intraparticle diffusivities from ternary component uptake curves using the shallow bed...

Area of Science:

• Chemical Engineering
• Adsorption Science

Background:

• Accurate modeling of fixed-bed reactors is essential for design and operation.
• Determining intraparticle diffusivity is straightforward for single-component systems but complex for multi-component systems.

Purpose of the Study:

• To propose a simplified shallow bed technique for determining intraparticle diffusivities in multi-component systems.
• To investigate ternary component systems of phenol (PH), benzoic acid (BA), and p-nitro-phenol (PNP).

Main Methods:

• Utilizing a shallow bed technique to simplify the determination of intraparticle diffusivities.
• Converting adsorption uptake curves of different components into a single theoretical uptake curve (TUC) using dimensionless groups.
• Matching the dimensionless experimental uptake curve (DEUC) with the TUC.

Main Results:

• Successfully determined the intraparticle diffusivities for phenol (8.00 x 10⁻⁸ cm²/s), benzoic acid (5.92 x 10⁻⁸ cm²/s), and p-nitro-phenol (5.05 x 10⁻⁸ cm²/s).
• Obtained values showed good agreement with simulated experimental data.
• Demonstrated the effectiveness of the shallow bed technique for simultaneous diffusivity determination.

Conclusions:

• The shallow bed technique offers a simplified and effective method for simultaneous determination of intraparticle diffusivities in multi-component systems.
• This approach is valuable for the accurate modeling and design of fixed-bed reactors handling complex mixtures.