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Mapping of regimes for the key processes in wet granulation: foam vs. spray
The evaluation of foam and spray granulation mechanisms and their performances in achieving uniform liquid distribution in a high-shear mixer-granulator is presented. A regime map is presented to describe the granulation mechanisms for the foam and spray systems. Foam and spray granulation are shown to successfully create granules of well-distributed moisture at the end of wet massing despite there was a deviation from the theoretical moisture content at the end of binder addition. In the wetting and nucleation regime, spray granulation involves drop penetration nucleation outside of the drop-controlled regime, whereas foam granulation operates favorably in the mechanical dispersion regime. For foam granulation, mechanical dispersion produces more uniform granule-size distributions below the overwetting limit. Spray granulation exhibits steady granule growth, whereas foam granulation shows induction granule growth followed by rapid granule growth. The regime map provides a basis to customize formulations and compare the different foam and spray granulation mechanisms.
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Journal
AIChE journalVolume
59Issue
7Pagination
2328 - 2338Publisher
Wiley-BlackwellLocation
Chichester, Eng.Publisher DOI
ISSN
0001-1541eISSN
1547-5905Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2013, American Institute of Chemical EngineersUsage metrics
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