Bubble and dew-point measurement of mixtures of 1H,1H,2H-perfluoro-1-octene and 1H,1H,2H,2H-perfluoro-1-octanol in supercritical CO2

Abstract

In this article, solubility data are presented for the fluoro-monomer (meth)acrylate, which plays an important role as an organic solvent in several industrial processes. High-pressure phase equilibria for 1H,1H,2H-perfluoro-1-octene + supercritical CO₂ (PFOe + Sc-CO₂), and 1H,1H,2H,2H-perfluoro-1-octanol + Sc-CO₂ (PFOl + Sc-CO₂) models were assessed in a static device at different temperatures starting from 313.2 to 393.2 K and maximum pressure of about 17.22 MPa. Temperature–pressure (T–p) diagrams of the PFOe + Sc-CO₂ and PFOl + Sc-CO₂ systems show mixture-critical curves between the critical temperatures of CO₂ and PFOe or CO₂ and PFOl. The solubility of PFOe and PFOl in the two systems gradually increases with increasing temperature at constant pressure. The experimental curves for the PFOe + Sc-CO₂ and PFOl + Sc-CO₂ binary models show phase behavior of curve type-I. Correlations of experimental results for the PFOe + Sc-CO₂ and PFOl + Sc-CO₂ models are compared with the P–R EOS using mixing rules with two parameters (κ_ij, η_ij). The root mean squared deviation (RMSD) percentages (%) for the two systems using the optimum factors evaluated at 353.2 K were 2.19% for PFOl + Sc-CO₂ and 5.30% for PFOe + Sc-CO₂. The RMSD (%) for the PFOl + Sc-CO₂ model evaluated by the alterable factor at each temperature was 2.78%.