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Theoretical study of multicomponent continuous countercurrent chromatography based on connected 4-zone units.

Lars Christian Kessler1, Andreas Seidel-Morgenstern

  • 1Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstr. 1, D-39106 Magdeburg, Germany.

Journal of Chromatography. A
|June 9, 2006
PubMed
Summary

This study analyzes modified simulated moving bed (SMB) chromatography for separating complex mixtures. It evaluates multi-zone SMB units, demonstrating their effectiveness for ternary and quaternary separations using an equilibrium stage model.

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Area of Science:

  • Chemical Engineering
  • Separation Science
  • Chromatography

Background:

  • Simulated Moving Bed (SMB) chromatography is a key separation technology.
  • Conventional 4-zone SMB processes are limited to binary separations.
  • Isolating target components from multi-component mixtures requires process modification.

Purpose of the Study:

  • To evaluate the performance of multi-zone SMB units (8- and 12-zone) for ternary and quaternary mixture separation.
  • To apply an equilibrium stage model to analyze these advanced SMB configurations.
  • To investigate the necessity and impact of purge streams in integrated multi-zone SMB systems.

Main Methods:

  • Utilizing an equilibrium stage model to simulate SMB processes.
  • Analyzing configurations of two or three 4-zone SMB units in series or integrated into 8- and 12-zone units.

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  • Assuming linear adsorption isotherms for all components.

    • Main Results:

    • Demonstrated the potential of 8- and 12-zone SMB units for continuous separation of ternary and quaternary mixtures.
    • The equilibrium stage model effectively describes the performance of these multi-zone systems.
    • Identified the critical role of additional purge streams for successful operation of integrated 8- and 12-zone units.

    Conclusions:

    • Modified multi-zone SMB chromatography offers a viable solution for separating complex mixtures.
    • The equilibrium stage model provides a robust framework for analyzing advanced SMB designs.
    • Strategic implementation of purge streams is essential for optimizing multi-zone SMB performance.