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The Redlich–Kwong equation is very similar to the Van der Waals equation, with only a slight modification being made to the attractive term, giving that term a temperature dependence. At high pressures, the volume of all gases approaches some finite volume, largely independent of temperature, that is related to the size of the gas molecules.
The Soave–Redlich–Kwong equation of state describes the vapor densities of pure components and mixtures quite well, but the deviations of the liquid-density prediction are high. For the VLE prediction of mixtures with components that have very differing sizes (e. g. ethanol, C 2 H 6 O, and eicosane, C 20 H 42) larger systematic errors are ...
The cubic-plus-association (CPA) equation of state combines the Soave–Redlich–Kwong equation with the association term from SAFT [21] [22] based on Chapman's extensions and simplifications of a theory of associating molecules due to Michael Wertheim. [23]
His new formula revolutionized the study of equations of state, and was the starting point of cubic equations of state, which most famously continued via the Redlich–Kwong equation of state [7] and the Soave modification of Redlich-Kwong. [8] The van der Waals equation of state can be written as
Kwong returned to 3M in 1951 as a senior chemical engineer in the Chemical Division, working there until retirement in 1980, at the age of 64. The development of the Redlich-Kwong equation was the last significant theoretical treatment of thermodynamics. He died of pneumonia in Saint Paul, Minnesota, on January 4, 1998, at the age of 81.
DWSIM is an open-source CAPE-OPEN compliant chemical process simulator for Windows, Linux and macOS.DWSIM is built on top of the Microsoft .NET and Mono Platforms and features a graphical user interface (GUI), advanced thermodynamics calculations, reactions support and petroleum characterization / hypothetical component generation tools.
The virial expansion is a model of thermodynamic equations of state.It expresses the pressure P of a gas in local equilibrium as a power series of the density.This equation may be represented in terms of the compressibility factor, Z, as = + + + This equation was first proposed by Kamerlingh Onnes. [1]
VTPR is a group contribution equation of state. [3] This is class of prediction methods combine equations of state (mostly cubic) with activity coefficient models based on group contributions like UNIFAC. [4] The activity coefficient model is used to adapt the equation of state parameters for mixtures by a so-called mixing rule. [5]