Phase behavior measurement for the binary mixture of CO 2 + neopentyl glycol diacrylate and CO 2 + neopentyl glycol dimethacrylate systems at high pressure

Abstract

In this work, the solubility curves for the CO 2 + neopentyl glycol diacrylate (NPGDA) and CO 2 + neopentyl glycol dimethacrylate (NPGDMA) systems are measured in static method at five temperatures of (313.2, 333.2, 353.2, 373.2 and 393.2) K and pressures up to 25.28 MPa. Both CO 2 + di(meth)acrylate systems have continuous critical mixture (locus) curves that exhibit maximums in pressure–temperature space between the critical temperatures of CO 2 and neopentyl glycol di(meth)acrylate. The solubility of CO 2 in the CO 2 + neopentyl glycol di(meth)acrylate mixture decreases as the temperature increases at a constant pressure. The CO 2 + NPGDA and CO 2 + NPGDMA systems exhibit type-I phase behavior. The experimental results for the CO 2 + NPGDA and CO 2 + NPGDMA systems are correlated with Peng–Robinson equation of state using a mixing rule including two adjustable parameters. The critical properties of NPGDA and NPGDMA are predicted with Joback–Lyderson and Lee–Kesler method.