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Application of a hydrodynamic model to microencapsulation by coacervation
1Eurand International SpA, Pessano con Bornago,MI, Italy. ldobetti@eurand.it
Journal of Microencapsulation
|February 12, 2002
Summary
Hydrodynamic conditions significantly influence microcapsule characteristics during coacervation. Microcapsule size directly correlates with microeddy dimensions, confirming the proposed model for turbulent agitated systems.
Area of Science:
- Chemical Engineering
- Materials Science
- Fluid Dynamics
Background:
- Microcapsule production via coacervation is sensitive to process parameters.
- Understanding the influence of hydrodynamic conditions is crucial for controlling microcapsule properties.
Purpose of the Study:
- To investigate the role of hydrodynamic conditions in microcapsule formation during coacervation.
- To apply and validate a mass transfer model for microcapsules in turbulent agitated systems.
Main Methods:
- Utilized the Armenante and Kirwan model for mass transfer in turbulent agitated systems.
- Calculated microeddy dimensions based on physical properties and agitation power.
- Determined agitation power using Rushton et al. hydrodynamic rules.
Main Results:
- Experimental results confirmed the hypothesis that microcapsules form within microeddies.
- A strong correlation was observed between calculated microeddy size and measured microcapsule diameter.
- Distribution error in microcapsule size was found to be proportional to mean microcapsule and microeddy diameters.
Conclusions:
- Hydrodynamic conditions, specifically microeddy characteristics, are key determinants of microcapsule size and distribution.
- Agitation power directly impacts microeddy size and consequently, microcapsule uniformity.
- The study validates a model linking fluid dynamics to microcapsule properties in coacervation processes.