| Supercritical Fluid Extraction (SFE) is a kind of newly technology of extractive separation. The research on SFE has its distinct significance and with favorable applied foreground. In recent years, the researches about SFE both on fundamental theory and practical application have made rapid progress. Presently, many researches have been emphasized on solubility and model of solid solute in supercritical carbon dioxide. While the diversification of many kinds of solute, the systematization of solubility measurement needs more work to do. Especially the solubility data with co-solvent still cannot meet the need of theoretical development. It needs to be more abundant and perfect. So the solubility measurement and phase equilibrium study on SFE is very important fundamental research work.The solubility of several kinds of solid solute (benzoic acid, α-naphthlcetic acid andβ-naphthol, phenylacetic acid, etc) has been measured with cosolvent such as ethanol, propanol, acetone and cyclohexane, etc. A self-founded continuous flow apparatus was applied in this work. We have systematically studied the solubility of benzoic acid andα-naphthlcetic with several kinds of cosolvent over the pressure range (8.0～35.0 MPa) , from the temperature 30℃ ～ 55℃. And we have also analyzed the affects of pressure, temperature and cosolvent on solubility. On the data, combining the data on literature, a semi-empirical liquid-model has been founded. Calculation on this model gets relative perfect calculative accuracy. Relative to the broad research on solubility on SFE, we domestic study on this is still not enough. It can be found to be original and a considerable contribute to abundance of fundamental data.
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