Question

The vapor-liquid equilibrium (VLE) condition which may be expressed as?

(a) y = f (S, H, T)

(b) y = f (P, T, x)

(c) x = f (T, S)

(d) y = f (J, S)

The question was asked by my college director while I was bunking the class.

My doubt is from Extractive Distillation topic in portion Azeotropic and Extractive Distillation of Distillation Design

Answer 1

Right option is (b) y = f (P, T, x)

For explanation: Where x and y are the liquid and vapor compositions, and P and T are the system pressure and temperature, respectively T and x are not independent at the equilibrium state.