Experimental and modeling study of isothermal VLE properties of the supercritical C₃H₈ + benzylamine mixture

Backgrounds: For the design and development of a method utilizing SC C₃H₈ for the chemical synthesis like the production of active pharma ingredients (pharmaceutical applications) and crop protection agents, it is essential to understand the solubility and other properties of benzylamine as an industrial important compound in the SC C₃H₈. Methods: A high-temperature and high-pressure optical cell has been used to measure the phase equilibrium properties (PTxy) of the binary SC C₃H₈ + benzylamine mixture. The experimental and modeling studies of the isothermal VLE properties (solubility, PTxy relationship) of benzylamine in the supercritical (SC) C₃H₈ along the four selected constant temperatures of (393.15, 413.15, 433.15, and 473.15) K over the pressure range from (0.9 to 9.5) MPa have been performed in the present work. Significant Findings: It was found the Perturbed-Chain Statistical Association Fluid Theory (PC-SAFT) is less accurate than its Critical Point-based revision (CP-PC-SAFT) in predicting the new VLE data in the C₃H₈ + benzylamine binary system with k₁₂ = 0. Both models substantially deviate from the bubble point data at pressures below 2 MPa.