Direct detection of double retrograde behavior in binary systems for equation of state models

In this work, a straightforward methodology is proposed to establish at a glance, for binary systems, whether a model of the equation of state type predicts the occurrence of double retrograde behavior (DRB), and to also establish what the ranges of conditions of DRB existence are. This is accomplished by computing three hyper-lines, which usually are highly non linear. One of them is the vapor-liquid critical line. The other two are loci of cricondenbar points and of cricondentherm points. Each line is efficiently calculated in a single computer run by resorting to a robust numerical continuation method.