The Wong–Sandler mixing rule is a thermodynamic mixing rule used for vapor–liquid equilibrium and liquid-liquid equilibrium calculations.[1]

Summary

The first boundary condition is

which constrains the sum of a and b. The second equation is

with the notable limit as (and ) of

The mixing rules become

The cross term still must be specified by a combining rule, either

or

See also

Vapor–liquid equilibrium
Equation of state

References

  1. Wong, D. S. H. & Sandler, S. I. (1992). "A theoretically correct mixing rule for cubic equations of state". AIChE Journal. 38 (5): 671–680. doi:10.1002/aic.690380505.


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