کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
231652 1427445 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Computation and modeling of tricritical phenomena in ternary and quaternary mixtures using the Perturbed Chain—Statistical Associating Fluid Theory equation of state
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Computation and modeling of tricritical phenomena in ternary and quaternary mixtures using the Perturbed Chain—Statistical Associating Fluid Theory equation of state
چکیده انگلیسی

Tricritical points (TCPs), contained in two-phase holes in three-phase surfaces, are of great importance in industrial applications of near-critical and supercritical technology because they occur in a range of temperatures, pressures and compositions where the technological processes are carried out. Their predictions are also important for mapping the transitions between different types of fluid phase behavior, when using molecular parameters in theoretical thermodynamic models, since these parameters take into account the different molecular interactions in the phase transition. In ternary systems, the tricritical point (TCP) has zero degrees of freedom; in other words, it exists only at a unique condition of pressure, temperature and composition. On the other hand, in quaternary systems, the tricritical state has one degree of freedom, and a line of tricritical points may exist. In this work, a theoretical procedure was developed and implemented using the theoretical, non-cubic Perturbed Chain-Statistical Associating Fluid Theory (PC-SAFT) equation of state (EoS) for computing and predicting the tricritical points of various ternary systems with single tricritical points, and tricritical lines of quaternary systems (involving n-alkanes, branched alkenes, alcohols, water, carbon dioxide, nitrogen and hydrogen sulfide) without fitting the binary interaction parameter. The results were compared with experimental tricritical data obtained from literature and an excellent agreement was obtained within a range of temperatures and pressures of practical interest in engineering.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 49, Issue 2, June 2009, Pages 135–142
نویسندگان
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