Solubility of vitamine C, diphnic acid, benzoic acid and 1 naphthalene acetic acid in SC CO 2 with and without cosolvent was experimentally determined. The experimental results show that the solubilities of vitamine C and diphnic acid in SC CO 2 are very low with and without cosolvent. It is also shown that the solubility of solids of benzoic acid and 1 naphthalene acetic acid increases with increase in pressure. And the relationship between the solubility of solids and the system temperature was also...