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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.
In 1972 G. Soave [4] replaced the term of the Redlich–Kwong equation with a function α(T,ω) involving the temperature and the acentric factor (the resulting equation is also known as the Soave–Redlich–Kwong equation of state; SRK EOS).
Critical isotherm for Redlich-Kwong model in comparison to van-der-Waals model and ideal gas (with V 0 =RT c /p c) The Redlich–Kwong equation is another two-parameter equation that is used to model real gases. It is almost always more accurate than the van der Waals equation, and often more accurate than some equations with more than two ...
Otto Redlich (November 4, 1896 – August 14, 1978) was an Austrian physical chemist who is best known for his development of equations of state like the Redlich-Kwong equation. [ 1 ] [ 2 ] Redlich also made numerous other contributions to science.
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
Almost all subsequent equations of state are derived from the van der Waals equation, like those from Dieterici, [7] Berthelot, [8] Redlich-Kwong, [9] and Peng-Robinson [10] suffer from the singularity introduced by 1/(v - b). Other equations of state, started by Beattie and Bridgeman, [11] are more closely related to virial equations, and show ...
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 ...
I'm then going to talk about some of the modifications that have been made to the equation over the years. The expansion is a work in progress right now (28 April 2012). I'm open to advice, but it would be nice if I could have a few days to do what I'm going to do. I also created an article on Joseph Neng Shun Kwong, who doesn't currently have one.