Xiang–Deiters generalized corresponding states theory
This EOS is based on a four-parameter corresponding-states approach. It uses the critical temperature, the critical molar volume, the acentric factor, and the aspherical factor (a function of the critical compression factor) as parameters.
The EOS is, in principle, a Sun–Ely EOS with 14 parameters . But here the parameters are not given individually for each substance, but calculated from a linear function of the acentric factor and the aspherical factor; the coefficients of this linear function are constants.
The EOS is well suited for noble gases, small alkanes, refrigerants, and even ammonia or water. It gives good results for pVT data, vapour pressure curves, and caloric data .
The EOS cannot be used for metastable states.
adjustable parameters: 4
 L. Sun, J. F. Ely, Fluid Phase Equilib. 222 (2004) 107–118.
 H.-W. Xiang, U. K. Deiters, Chem. Eng. Sci. 63 (2008) 1490–1496.
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