Non-ideal Vapor–Liquid Equilibrium

Binary VLE with Wilson/NRTL activity coefficients. Handles azeotropes (positive / negative deviation).

Activity model

Component 1 (lighter)

Component 2 (heavier)

Pressure

Overall mole fraction of component 1

Only curated binary pairs have interaction parameters; others are disabled.

Activity coefficients γ reflect non-ideality; γ=1 is ideal (Raoult).