Computation of tricritical points in ternary systems

摘要: At tricritical points, four equations in the thermodynamic variables must be satisfied. Methods of evaluating functions and solving these have recently been developed (Michelsen Heidemann, 1988). A modified approach to evaluation a new solution procedure for calculation points equation state models are presented here. The is evaluated comparison previous ones, its application made using Peng-Robinson Soave-Redlich-Kwong state. proved capable locating variety systems with complex multiphase behavior. These included ternary single an ordinary critical point occurring at same composition as four-phase equilibria two points. Comparisons experimental data eight systems. calculations prove highly sensitive pure component binary parameters models. Features phase diagrams mixtures discussed well predictions several homologous series