Thread Content
Dear marine professionals, in order to help everyone learn the ProII process simulation software better – so that beginners can acquire knowledge and experienced users can refresh their skills – we are launching the \"Make Progress Every Day\" series of courses on the basics of ProII. Since I primarily use Aspen Plus/Hysys in my work, I have not studied ProII software systematically; therefore, the knowledge I offer might be quite basic. I hope fellow users will provide valuable suggestions and opinions, and actively participate in the discussions. True or False: 3. The following statement regarding the types and characteristics of thermodynamic models is correct; if it is incorrect, please provide the reason: 1) Ideal approach – calculating the properties of a mixture based on the specific gravities of the individual pure substances. The estimation of enthalpy and density is relatively accurate, but the estimation of phase equilibrium constants has a large error. 2) General correlation method — some empirical or semi-empirical correlations established based on the corresponding state principle. It generally does not contain adjustable binary interaction parameters. For example: Braunk-10, Grayson-Streed (GS). 3) Equation of state method (EOS) — mathematical expressions relating fluid density, temperature, pressure, and composition. It is possible to calculate the phase equilibrium constants, excess values of enthalpy and entropy of components, and so on. The most common equations of state: ideal gas equation, van der Waals equation, RK equation, SRK equation, PR equation ； Mainly used in: light hydrocarbon systems, hydrogen-rich systems (reformers, hydrogenation, dehydrogenation reactors). 4) Activity coefficient method (LACT) — The activity coefficient is calculated based on the excess Gibbs free energy of the liquid phase mixture. Most commonly used equations: NRTL, UNIQUAC ； It is mainly used for: non-ideal chemical systems, aromatic extraction, etc. 5) Electrolyte system – used when an electrolyte is present in the system. Primary equation: E-NRTL equation. 6) Polymer system — Used in polymer systems. Main equations: Flory-Huggins, UNIFAC Free Volume, Advanced Lattice model. 7) Special systems — various property packages. These mainly include: Glycol package (SRKM), Sour package (GPA), Amine package, Alcohol package (NRTL). Answer key: 1)–7) All correct