Abstract:
A continuous gas anti solvent apparatus has been constructed in this research. With hydroquinone acetone carbon dioxide system as a test background, GAS process using supercritical CO 2 is utilized to prepare super fine particles. Comparisons between our results and reference are made to check reliability of the apparatus and influences of solution concentration and flow rate on size and morphology of produced particles are investigated. The results obviously showed that a higher primary solution concentration lead to a decrease in size of the sample particles and a higher primary solution concentration to an increase. The prismatic crystals are formed at high flow rate (12.0mL/min) while the needles created at relatively low flow rate (2.0mL/min).