Computation and modeling of critical phenomena with the perturbed chain-statistical associating fluid theory equation of state

摘要: Abstract Critical phenomena such as co-solvency, miscibility windows and two-phase holes in the three-phase surfaces can be of great importance industrial applications near-critical supercritical technology, since they occur a range temperatures, pressures compositions where technological processes are carried out. They also very important for mapping transitions between different types fluid phase behavior. In this work, perturbed chain-statistical associating theory (PC-SAFT) equation state was used to model critical various ternary systems their respective binary subsystems (which include n -alkanes, -alkanols, aromatic alcohols carbon dioxide) by fitting interaction parameters ( k ij ). The experimental data covered temperatures practical interest engineering. Results were compared with obtained from literature an excellent agreement obtained. An algorithm calculate numerically double endpoints tricritical points according thermodynamic definitions developed.