The solubilities of azobenzene, p- hydroxyazobenzene, and p- dimethylaminoazobenzene which were suitable for dyeing from supercritical carbon dioxide (SC-CO 2 ) were measured at 308.2 K and 318.2 K over the pressure range from 9.1 MPa to 25.3 MPa by a flow type apparatus. The solubilities were determined from the mass of solute trapped by decompression and the volume of released CO 2 . Solubility data were correlated by a solution model based on the regular solution concept.
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Maeda et al. (2001) studied this question.
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