A gas consisting only of CO and N2 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:

They yield a flue gas of composition: 12.8 mol-% CO, 3.7 mol-% CO', 5.4 mol-%, O2, 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?

Transcribed Image Text:

CO2 + C → 2CO and 2C+O2 → 2CO