Abstract
Fine benzoic acid and phenanthrene crystals were produced by expansion of a supercritical carbon dioxide solution through a small capillary nozzle. The produced crystals had a size of 2 to 10 μm. Similar trends for the number average particle size were observed for both compounds. A higher pre-expansion pressure leads to smaller particles at the same entrance mole fraction. At a given pre-expansion pressure, the average particle size first increases at higher entrance mole fractions until a maximal value is reached, and then the particle size starts to lower again. Models are presented for the pressure and temperature profiles in the nozzle, which allow calculation of the supersaturation profiles along the nozzle to be carried out.
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