Phase behavior measurement for the binary mixture of CO2 + neopentyl glycol diacrylate and CO2 + neopentyl glycol dimethacrylate systems at high pressure

In this work, the solubility curves for the CO2 + neopentyl glycol diacrylate (NPGDA) and CO2 + 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 CO2 + di(meth)acrylate systems have continuous critical mixture (locus) curves that exhibit maximums in pressure–temperature space between the critical temperatures of CO2 and neopentyl glycol di(meth)acrylate. The solubility of CO2 in the CO2 + neopentyl glycol di(meth)acrylate mixture decreases as the temperature increases at a constant pressure. The CO2 + NPGDA and CO2 + NPGDMA systems exhibit type-I phase behavior. The experimental results for the CO2 + NPGDA and CO2 + 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.