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Diffusion model for fluidized-bed drying.

M A Zoglio, W H Streng, J T Carstensen

    Journal of Pharmaceutical Sciences
    |November 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    Fluid bed drying of granules shows particle segregation during drying. External water vapor diffusion, not internal, limits drying rates, impacting moisture distribution.

    Area of Science:

    • Chemical Engineering
    • Particle Technology
    • Drying Technology

    Background:

    • Understanding particulate motion and attrition is crucial for optimizing drying processes.
    • Granulation drying involves complex interactions between particle size, density, and moisture content.

    Purpose of the Study:

    • To investigate particulate motion and attrition in a fluid bed dryer using a sucrose-lactose-starch granulation.
    • To determine the rate-limiting step in fluid bed drying and propose a suitable model.
    • To establish quantitative relationships between moisture content and particle size in dried granules.

    Main Methods:

    • Utilized a sucrose-lactose-starch granulation within a fluid bed dryer.
    • Analyzed particle classification and segregation during the drying process.

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  • Developed and validated a model based on external water vapor diffusion using vapor-concentration curves and rate constants.

    • Main Results:

    • Observed particle classification, with finer particles drying faster and larger particles accumulating centrally.
    • Identified external water vapor diffusion as the rate-limiting step, supported by linear dependence on air velocity.
    • Established that larger particles retain higher moisture content post-drying, a trend consistent with countercurrent drying.

    Conclusions:

    • Fluid bed drying leads to particle segregation and non-uniform moisture distribution.
    • The proposed external diffusion model accurately describes the drying kinetics.
    • The observed moisture distribution poses challenges for both batch and continuous granulation production due to lack of equilibration upon storage.