Abstract
The combination of fluidized bed technology with supercritical carbon dioxide as fluidizing gas and as a solvent for the coating material enables the production of thin, even and solvent‐free coatings. However the successful operation of such a coating process requires detailed knowledge of fluidization at supercritical fluid conditions. The results of the experiments show that the minimum fluidization velocity at supercritical fluid conditions can be predicted with satisfactory accuracy. The coating of different solids with paraffin results in thin layers (0.7–2 μm), which are smooth and complete. Therefore, the coating of particles in fluidized beds operated with supercritical fluids can be considered as an alternative to existing coating technologies.
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