Abstract
Abstract Fluidized bed combined with RESS process in supercritical carbon dioxide (SC-CO 2 ) is a promising technology for coating heat-sensitive materials of high added value. This work presents a study of the most influencing operation parameters (temperature, pressure and flow) of the two steps of the process (saturation and coating). As a model system, glass beads particles ( d p,s = 176 μm) were encapsulated with paraffin ( T m = 52–54 °C). Two different ways of injecting the coating solution of paraffin in the SC-CO 2 in the fluidized bed were tested, bottom and top spray. The operation variables were kept in the following ranges for the saturation step: pressure from 18 to 22 MPa and temperature from 35 to 55 °C. In the coating process the pressure range from 8 to 10 MPa and temperature from 35 to 50 °C. Yields of the global process up to 70% were achieved. SEM-images of the achieved coatings show complete coating films with no agglomeration in the top spray experiments.
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