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Modelling of an annular photocatalytic reactor

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Abstract

This work deals with the photocatalytic oxidation of toluene at room temperature and atmospheric pressure in the gas phase. The differential equations of the reactor model are solved numerically with simultaneous estimation of the model parameters. Estimation of the kinetic data is performed using a modified differential method of data analysis and a Nelder–Mead method of nonlinear optimization for parameter estimation. The reaction is performed in an annular photoreactor using UVA black light blue fluorescent lamp. The experiments are carried out at different total flow rates of the reaction feed (20–160 cm3 min−1), two different inlet concentrations of toluene (2.67 and 5.24 g m−3) and at constant relative humidity (25%). A good agreement between the experimental data and theoretical predictions is obtained, supporting the applicability of the proposed models to describe the investigated process performed in laboratory annular photoreactor.

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Abbreviations

a :

Geometric surface area (m2)

A R :

Surface area of reactor (annulus) cross-section (m2)

C A :

Toluene concentration (g m−3)

C A,0 :

Inlet toluene concentration (g m−3)

CA,g :

Toluene concentration in the fluid phase (g m−3)

CA,s :

Toluene concentration at the solid phase (g m−3)

\( \overline{C}_{A ,t} \) :

Average toluene concentration in the fluid phase (g m−3)

D A :

Molecular diffusion coefficient of toluene in air (m2 s−1)

k A :

Reaction rate constant (min−1)

k g :

Interphase mass transfer coefficient (m h−1)

N :

Number of the experimental points (dimensionless)

r :

Radial reactor coordinate (m)

r A :

Reaction rate (mol h−1 kg−1)

R :

Diameter of reactor annulus (m)

SD:

Root of the mean square deviation (dimensionless)

u :

Superficial fluid velocity (m h−1)

um :

Mean superficial fluid velocity (m h−1)

v 0 :

Volume flow rate (m3 h−1)

V :

Reactor volume (m3)

X A :

Toluene conversion (dimensionless)

z :

Axial reactor coordinate (m)

Z:

Length of the reactor (m)

κ :

Ratio of inner and outer reactor diameter (dimensionless)

τ:

Space time (min)

Re:

Reynolds number (dimensionless)

Sc:

Schmidt number (dimensionless)

Sh:

Sherwood number (dimensionless)

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Acknowledgments

The authors highly appreciate the financial support that the Ministry of Science, Education and Sport of Republic of Croatia has given for this study.

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Authors and Affiliations

  1. Department of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia

    M. Marečić

  2. Department of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia

    F. Jović, V. Kosar & V. Tomašić

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  1. M. Marečić
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  2. F. Jović
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  3. V. Kosar
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  4. V. Tomašić
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Correspondence to V. Tomašić.

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Marečić, M., Jović, F., Kosar, V. et al. Modelling of an annular photocatalytic reactor. Reac Kinet Mech Cat 103, 19–29 (2011). https://doi.org/10.1007/s11144-011-0299-y

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