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The solubility of carbon dioxide in poly (ethylene terephthalate) (PET) at high pressure and elevated temperature conditions was investigated for a better understanding of the phase equilibrium characteristics of supercritical CO 2 /PET binary system and useful data for the process development of the supercritical fluid dyeing. Based on the principle of pressure decaying, a novel experimental apparatus suitable to high pressure and high temperature measurement was established. The solubilities of CO 2 in PET were measured with the apparatus at temperatures of 110, 120, and 1308C and pressures up to 30.0 MPa. The results show that the solubility of CO 2 in PET increases with the increase of pressure and CO 2 density, respectively, at a constant temperature, whereas it decreases with the increase of temperature at a constant pressure. The Sanchez-Lacombe equation of state (S-L EOS) was used to correlate the experimental data. The calculated results are in good agreement with the experimental ones. The average absolute relative derivation (AARD) is less than 3.91%.

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