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Isothermal vapor−liquid equilibrium data for the binary mixture of 1,1,1,2-tetrafluoroethane (HFC-134a) + normal butane (R600) were measured at 273.15, 283.15, 293.15, 303.15, 313.15, and 323.15 K, respectively. The experiments were carried out using a continuous circulation-type equilibrium apparatus to measure temperature, pressure, and the compositions of the liquid and vapor phases. The experimental data were correlated with the Peng−Robinson equation of state (PR EOS) using the Wong−Sandler (W−S) mixing rule. Calculated results showed good agreement with experimental data. It was found that this system has very strong positive azeotropes for all the temperature ranges studied here.

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High-pressure phase behavior is obtained for CO 2 (1) + benzyl acrylate (2) and CO 2 (1) + benzyl methacrylate (2) systems at (313.2, 333.2, 353.2, 373.2, and 393.2) K and pressures up to 24.43 MPa. The solubility of monomers for the CO 2 (1) + benzyl acrylate (2) and CO 2 (1) + benzyl methacrylate (2) systems increases as the temperature increases at constant pressure. The CO 2 (1) + benzyl acrylate (2) and CO 2 (1) + benzyl methacrylate (2) systems exhibit type-I phase behavior. The experimental results for CO 2 (1) + benzyl acrylate (2) and CO 2 (1) + benzyl methacrylate (2) systems are correlated with the Peng-Robinson equation of state using a van der Waals one-fluid mixing rule including two adjustable parameters. Critical constants (P c , T c , and ω) are predicted with the Joback method and the Lee-Kesler method.