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Related Experiment Videos

Fluid bed agglomeration with a narrow droplet size distribution.

S H Schaafsma1, P Vonk, N W Kossen

  • 1Industrial Pharmacy, University of Groningen, A. Deusinglaan 1, Groningen, The Netherlands.

International Journal of Pharmaceutics
|December 22, 1999
PubMed
Summary

A novel nozzle enables precise control over droplet size in fluid bed agglomeration, optimizing granule growth. This advancement facilitates studying droplet wetting and granule development for improved process control.

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Area of Science:

  • Chemical Engineering
  • Particle Technology
  • Materials Science

Background:

  • Liquid distribution significantly impacts agglomerate growth in fluid bed agglomeration.
  • Controlling droplet size is crucial for predictable granule formation.

Purpose of the Study:

  • To develop and evaluate a new nozzle for uniform droplet generation in fluid bed agglomeration.
  • To investigate the influence of droplet characteristics on granule growth and development.

Main Methods:

  • Development of a novel nozzle for controlled droplet size independent of airflow.
  • Analysis of spray rate, mixing, and nucleation ratio effects on granule size.
  • Utilizing tracer mass to study granule mass accumulation and distribution.

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Main Results:

  • The new nozzle produces uniform droplets, allowing independent control of droplet size.
  • Spray rate and mixing in the spray zone dictate average granule size.
  • A linear relationship exists between granule volume and constituent droplet number in early stages.
  • Nucleation ratio is a material-dependent parameter indicating binder liquid efficiency.
  • Reduced granule growth rate is linked to insufficient granule rewetting.
  • Tracer mass shows a linear correlation with granule mass in early stages, independent of tracer solubility.

Conclusions:

  • The developed nozzle is effective for studying droplet wetting and granule growth dynamics.
  • Precise control over liquid distribution enhances understanding and optimization of fluid bed agglomeration.