The Microcapsules Production by Supercritical Fluid Impinging Technology Combines with Fluidized Bed

Abstract

The supercritical fluid impinging technology combined with fluidized bed (SFIT-FB) process is a novel technique to prepare microcapsules. The process was performed using ultra-fine glass beads as the core particle and paraffin the coating material. The influences of operation parameters, including the pressure and the temperature of mixing vessel and the impinging distance on the microcapsule morphology, size distribution and coating rate were investigated. The microcapsule characteristics could be controlled by adjusting the operation conditions. A number of techniques were used for the characterisation of the microcapsules. A scanning electron microscope (SEM) was used to examine the morphology of particle surface. A laser particle size analyzer (LPSA) was used to measure the particle size distribution, and differential scanning calorimeter (DSC) measurements were conducted to determine the apparent coating rates of microcapsules. The advantages of SFIT lies in enhancing the mass transfer and heat transfer, which prevent particles agglomeration.