Adiabatic Processes in the Vapor鈥揕iquid Two-Phase Region. 2. Binary Mixtures

详细信息    查看全文

• 作者：Attila R. Imre ; Sergio E. Qui帽ones-Cisneros ; Ulrich K. Deiters
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 1, 2015
• 年：2015
• 卷：54
• 期：25
• 页码：6559-6568
• 全文大小：582K
• ISSN：1520-5045

文摘

The phase equilibrium conditions and entropy balance equations for multicomponent fluid mixtures are expressed with a density-based formalism (鈥渋sochoric thermodynamics鈥?, and isentropes in the one- and two-phase region are computed from equations of state; here the Peng鈥揜obinson equation is used as an example. Griffiths鈥?theorem鈥攐ne- and two-phase isentropes meet at a maxcondenbar point (pressure maximum of an isopleth) with equal slopes鈥攃ould be confirmed. For chemically similar compounds at subcritical conditions, the resulting isentrope patterns are similar to those of pure fluids. If one of the components is supercritical, it is possible that, along a part of a two-phase isentrope, the liquid phase has a higher molar entropy than the vapor phase (鈥渆ntropic inversion鈥?. The phenomenon not only poses a numerical problem, but is also relevant for the question whether a two-phase isentrope can run into the llg three-phase curve.