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A property of a Fluid Mixture represented by the
 junction point of Vapour Liquid Equilibrium (VLE) area on PT diagram of Fluid Mixture (see Fig. 1).

It is characterized by pseudo-critical temperature  T_{pc} and pseudo-critical pressure P_{pc}.

The simplest estimate  (also called Linear Blending Rule) of Pseudo-Critical Point ( T_{pc}, \, P_{pc} ) is the mole fraction weighted average of the critical temperature \{ T_{c, i} \} and  critical pressure \{ P_{c, i} \} of fluid components (which are pure substances) :

(1) T_{pc} = \sum_i x_i \, T_{c,i}
(2) P_{pc} = \sum_i x_i \, P_{c,i}



mole fraction of the i-th mixture component


critical temperature of the i-th mixture component


critical pressure of the i-th mixture component

There are other no-linear methods to blend the components  to estimate the 
Pseudo-Critical Point but many engineering applications use (1) and (2) as the seed and then fit the values to match lab test data.

In case the fluid composition is not known one can use empirical 
Pseudo-Critical Point Correlations to assess the Pseudo-Critical Point.

See also

Natural Science / Physics / Thermodynamics / Thermodynamic system 

Fluid Mixture ]

Pseudo-Critical Point (Tpc, Ppc) ][ Pseudo-Critical Temperature (Tpc) ][ Pseudo-Critical Pressure (Ppc)][ Pseudo-Critical Point Correlations @model ]

[ Critical Point (Tc, Pc) ][ Сritical Temperature  (Tc) ][ Critical Pressure (Pc) ]

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