Question

A process is carried out for the feed mixture of 50% air and 50% methane vapor, the compressor recovered 20% of methane, what is the exit pressure of the compressor, if the partial pressure of methane vapor is 25 mm Hg?

(a) 56.3 mm Hg

(b) 78.9 mm Hg

(c) 92.1 mm Hg

(d) 98.7 mm Hg

This question was addressed to me in homework.

The origin of the question is Condensation in portion Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

Answer 1

Correct option is (a) 56.3 mm Hg

To explain: Exit components, methane: 0.5*0.8 = 0.4, air: 0.5, => ymethane= 0.4/0.9 = 0.444, => Total exit pressure = 25/0.444 = 56.3 mm Hg.