Abstract
Phase equilibria of CO 2–Phenol–Poly(ethylene terephthalate) (PET) ternary system were investigated at 318.15 and 326.15 K and at pressures ranging from 6 to 17 MPa. The results show that the solubility of CO 2 in PET/phenol solution increases with pressure, and decreases with temperature. The solubility of PET in phenol (on CO 2-free basis) decreases significantly with pressure at pressures lower than 10 MPa at 318.15 K and 11 MPa at 326.15 K, but increases slightly with pressure at higher pressures. On the basis of the phase behavior studied, PET powders were produced by the gas anti-solvent (GAS) process, and the morphology of the precipitated PET was examined using scanning electron microscopy.
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