High pressure phase behavior and modeling of CO2–propyl acrylate and CO2–propyl methacrylate systems

High pressure phase behavior are obtained for CO2–propyl acrylate system at 40, 60, 80, 100 and 120 °C and pressure up to 161 bar and for CO2–propyl methacrylate systems at 40, 60, 80, 100 and 120 °C and pressure up to 166 bar. The solubility of propyl acrylate and propyl methacrylate for the CO2–propyl acrylate and CO2–propyl methacrylate systems increases as the temperature increases at constant pressure. The CO2–propyl acrylate and CO2–propyl methacrylate systems have continuous critical mixture curves that exhibit maximums in pressure at temperatures between the critical temperatures of CO2 and propyl acrylate or propyl methacrylate. The CO2–propyl acrylate and CO2–propyl methacrylate systems exhibit type-I phase behavior with a continuous mixture critical curve. perimental results for CO2–propyl acrylate and CO2–propyl methacrylate systems are modeled using both the statistical associating fluid theory (SAFT) and Peng–Robinson equations of state. A good fit of the data are obtained with SAFT using two adjustable parameters for CO2–propyl acrylate and CO2–propyl methacrylate systems and Peng–Robinson equation using one and two adjustable parameter for CO2–propyl acrylate and CO2–propyl methacrylate system.