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The solubility of ferulic acid in supercritical carbon dioxide (SC-CO 2 ), both pure and ethanol modified, was measured using a flow type apparatus. The mass of solute trapped after decompression was determined spectrophotometrically. The solubility was measured at (313.2, 323.2, and 333.2) K over the pressure range from (12 to 28) MPa. Solubility data in pure SC-CO 2 were correlated by the Chrastil equation. When ethanol cosolvent was added to SC-CO 2 in concentrations from (0.2 to 3.6) mass %, the solubility increase was proportional to the product w et 1.08 S 0.6, where w et is the mass fraction of ethanol in CO 2 and S is the mass fraction solubility of ferulic acid in pure SC-CO 2 .
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Helena Sovová (2001) studied this question.
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