?A gas consisting only of CO and \(N_{2}\) is made by passing a mixture of flue gas and

Chapter 4, Problem 4.43

(choose chapter or problem)

A gas consisting only of CO and \(N_{2}\) is made by passing a mixture of flue gas and air through a bed of incandescent coke (assume pure carbon). The two reactions that occur both go to completion:

\(CO_{2}  + C → 2CO and 2C +  O_{2}  → 2CO\)

The flue gas composition is 12.8 mol-% CO, 3.7 mol-% CO2, 5.4 mol-% \(O_{2}\), and 78.1 mol-% N2. The flue gas/air mixture is so proportioned that the heats of the two reactions cancel, and the temperature of the coke bed is therefore constant. If this temperature is 875°C, if the feed stream is preheated to 875°C, and if the process is adiabatic, what ratio of moles of flue gas to moles of air is required, and what is the composition of the gas produced?

Text Transcription:

N_2

CO_2  + C → 2CO and 2C +  O_2  → 2CO

O_2