An experimental and PC-SAFT modeling study of the equilibrium behavior of trimethoxyvinylsilane + CO 2 and triethoxyvinylsilane + CO 2 mixtures

A synthetic methodology was applied to investigate the phase behavior of solution mixtures containing trimethoxyvinylsilane and triethoxyvinylsilane in supercritical carbon dioxide under high-pressure conditions, spanning temperatures up to 393.2 K and pressures up to 20.53 MPa. Critical mixture curves were distinctly observed in both binary systems, exhibiting a maximum within the pressure–temperature domain situated between the critical temperatures of CO 2 and the respective constituent. Notably, both systems displayed type-I phase behavior. Solubility curves were generated using the perturbed chain-statistical associating fluid theory (PC-SAFT) equation of state in theoretical analysis. Comparative analysis between the projected and experimental outcomes for the CO 2 + trimethoxyvinylsilane and CO 2 + triethoxyvinylsilane systems revealed substantial agreement, affirming the efficacy of the PC-SAFT equation of state.