Experimental and computational phase behavior investigation for the CO₂ + 1H, 1H-perfluorooctyl acrylate and CO₂ + 1H, 1H-perfluorooctyl methacrylate systems at high pressure

The solubility information of fluoro-monomer (meth) acrylate in organic solvents is an important factor affecting their use in numerous engineering practices. This study investigated the phase equilibria of 1H, 1H-perfluorooctyl acrylate (PFOA) and 1H, 1H-perfluorooctyl methacrylate (PFOMA) in supercritical CO₂ using optical fiber and contact lenses. The solubility curves investigations were conducted at different temperatures (313.2 to 393.2) K and pressures (3.31 to 16.84) MPa, and the mole fraction of (0.032 to 0.630). Results revealed that the PFOA + S_C-CO₂ and PFOMA + S_C-CO₂ systems exhibited a type-I behavior. The RMSD (%) for the PFOA + S_C-CO₂ [k_ij = 0.075, η_ij = 0.0], and PFOMA + S_C-CO₂ [k_ij = 0.075, η_ij = 0.0] models using two factors determined at 353.2 K evaluated with the alterable parameters at each T were 5.08 %, and 5.36 %, respectively. The correlation of the experimental response for the PFOA + S_C-CO₂ and PFOMA + S_C-CO₂ two component models were examined using Peng-Robinson (PR) equation of state (EOS) involving two parameters (k_ij η_ij) base on a fluid mixture rule. Additionally, the critical properties (p_c, T_c and ω) and vapor pressure of PFOA and PFOMA were assessed using the Joback-Lyderson group impact.