High pressure phase behavior are obtained for CO2-propyl acrylate system at 40, 60, 80, 100 and 120 degreesC and pressure up to 161 bar and for CO2-propyl methacrylate systems at 40, 60, 80, 100 and 120 degreesC 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-l phase behavior with a continuous mixture critical curve. The experimental 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 CO-propyl methacrylate system.