Wong–Sandler mixing rule

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

Summary

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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

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Vapor–liquid equilibrium
Equation of state

References

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  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.