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Equilibrium and dynamic investigations of organic acids adsorption onto ion-exchange resins

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Abstract

The aim of the study was to determine properties of selected ion-exchange resins for citric and lactic acids recovery, to define sorption isotherms for these acids at different temperatures (in the range of 20–60°C) and to determine diffusion coefficients inside sorbent particles. A mathematical model of the ion-exchange process in the chromatographic column and its experimental verification is also presented. During investigations 18 types of ion-exchange resins were tested. It was found that weakly basic resins were more suitable for the recovery process than strongly basic ones. The best resin for the separation of citric acid was Amberlite IRA-67 and for lactic acid Amberlite IRA-92. As a result of transient-state sorption experiments diffusion coefficients of the citric acid inside the sorbent particle at different temperatures were obtained. It was found that D p increased with the temperature by two times in the range of 20–60°C, and its value at 60°C was 7.2×10−10 m2/s. The proposed mathematical model was applied to identify bed operation parameters in the column for the needs of the simulated moving bed chromatography method.

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Abbreviations

b :

Equilibrium constant in Langmuir equation, [dm3/g]

c :

Acid concentration in the liquid phase inside the particle pores, [g/dm3]

C :

Acid concentration in the liquid, [g/dm3]

D L :

Axial dispersion coefficient, [m2/s]

D p :

Intraparticle diffusion coefficient, [m2/s]

k f :

Liquid film mass transfer coefficient, [m/s]

L :

Ion-exchanger bed height, [m]

q :

Acid concentration in the adsorbent phase, [g/dm3]

R p :

Particle radius, [m]

U :

Volumetric flow rate of the feeding solution, [dm3/s]

V :

Volume of the solution, [dm3]

W :

Weight of the wet resin particles, [g]

ε :

The ion-exchanger bed porosity, [-]

ε p :

Particle porosity, [-]

ν :

Linear liquid velocity, [m/s]

ρ :

Apparent density of the wet resin, [g/dm3]

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Acknowledgements

This research was supported by a grant of the Polish Committee for Scientific Research.

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Authors and Affiliations

  1. Faculty of Process and Environmental Engineering, Technical University of Lodz, ul. Wolczanska 213/215, 93-005, Lodz, Poland

    P. Gluszcz, T. Jamroz, B. Sencio & S. Ledakowicz

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  1. P. Gluszcz
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  2. T. Jamroz
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  3. B. Sencio
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  4. S. Ledakowicz
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Correspondence to P. Gluszcz.

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Gluszcz, P., Jamroz, T., Sencio, B. et al. Equilibrium and dynamic investigations of organic acids adsorption onto ion-exchange resins. Bioprocess Biosyst Eng 26, 185–190 (2004). https://doi.org/10.1007/s00449-003-0348-7

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  • DOI: https://doi.org/10.1007/s00449-003-0348-7

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