Combustion exercise:
7. The exit gas from a phosphate reduction furnace analyses P4: 8%, CO : 89%,
N2: 3%. This gas is burnt with air under conditions selectively to oxidise
phosphorus. From the flue gas, the oxides of P precipitate on cooling and is
separated from the remaining gas. Analysis of latter shows CO2: 0.9%, CO :
22.5%, N2: 68% and O2: 8.6%. Assume oxidation of P is complete and that P
exists in the flue gas partly as P4O6and partly as P4O10. Calculate the following
(a) % of CO entering the furnace that is oxidised to CO2(b) % of P4that is
oxidised to P4O10.
