COMPLETE SUSPENSION OF MICROCAPSULES IN BAFFLED AND UNBAFFLED STIRREDTANKS

The study of rotational speed for complete suspension have been carrie d out by varying different parameters: density ratio, stirrer diameter , clearance of stirrer, solid particle diameter, and particle concentr ation. The equations of correlation available in the literature were t ested in order to obtain the one giving the best prediction of experim ental values. The proposed correlation enables the determination of th e minimal rotational speed for complete suspension of microcapsules in a pilot reactor with a good accuracy. The results will be used for th e scale up of a microencapsulation process from laboratory to the pilo t stirred vessel, for which it is considered that the extrapolation fa ctor is the minimal rotational speed for complete suspension.