Thermodynamic prerequisites for the organization of the technological process of petroleum product processing via high-speed heating of feedstock, as well as preheating followed by a pressure release, are considered. These regimes are designed to bring the processing parameters (temperature and pressure) close to the boundary of thermodynamic stability for the most thermally stable components, where the boundary is defined by setting the second derivative of one of the thermodynamic potentials equal to zero. Relationships that make it possible to determine the regimes of feedstock preparation for processing under given conditions were obtained.