Equilibrio de fases en mezclas asimétricas de interés para la industria de Petróleo a partir de ecuaciones de estado incluyendo efectos asociativos.

Abstract

Phase Equilibrium Engineering involves the use of thermodynamic knowledge of phase behavior in different types of mixtures, and its quantification through mathematical models, to contribute to the development of processes, whether these chemical (with reaction), separation, Extraction, etc. In particular, the application of thermodynamics assumes a fundamental role in the development of processes where the supercritical fluids are present due to the multiple and the degree of complexity of the types of phase behavior that are observed in the mixtures with supercritical fluids at high pressures, Which depending on the case may prove beneficial or limiting for a given technological problem. In this context, it is essential for the hydrocarbon exploitation to have calculation tools that allow to distinguish in the regions in a phase as a function of pressure and temperature, immiscibility and miscibility according to a state equation (EoS) to obtain the description Quantitative composition of equilibrium phases over wide ranges of conditions. Therefore, an algorithm capable of predicting phase equilibria in asymmetric mixtures of interest to the petroleum industry was developed from state equations including associative effects, where the Pen-Robinson equations of state were used. RKPR for asymmetric CO2 + mixtures (phenanthrene, anthracene, pyrene, chrysene, triphenylene, n-tetracosan, n-octacosane, n-dotricontane) and analyzed the importance of a third parameter in the structure of an state of equation as well as the need To implement binary interaction parameters. Deviations were obtained in the molar fraction of precipitation of the solids other than CO2, for the CO 2 + phenanthrene, anthracene, pyrene series between 5% and 19% and for CO2 + chrysene, triphenylene between 2% and 9%. The series of CO 2 + ntetracosan, n-octacosane, n-dotricontane yielded deviations between 5% and 7% in molar fraction of the precipitate, in general for the two models of state equations implemented in this work.