Question

A process is carried out for the feed mixture of 80% air and 20% CO2, the compressor recovered 50% of CO2, what is the exit pressure of the compressor, if the partial pressure of CO2 is 15 mm Hg?

(a) 135 mm Hg

(b) 145 mm Hg

(c) 175 mm Hg

(d) 200 mm Hg

This question was posed to me by my college director while I was bunking the class.

Query is from Condensation in chapter Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

Answer 1

The correct choice is (a) 135 mm Hg

To explain I would say: Exit components, CO2: 0.2*0.5 = 0.1, air: 0.8, => yCO2 = 0.1/0.9 = 0.111, => Total exit pressure = 15/0.111 = 135 mm Hg.