Question

Methanol vapor is burned with excess air in a catalytic combustion chamber. Liquid methanol initially at 25 ◦C is vaporized at 1.1 atm and heated to 100 ◦C; the vapor is mixed with air that has been preheated to 1100 ◦C, and the combined stream is fed to the reactor at 100 ◦C and 1 atm. The reactor effluent emerges at 300 ◦Cand 1atm. Analysis of the product gas yields a dry-basis composition of 4.8% CO2, 14.3% O2, and 80.9% N2. (a) Calculate the percentage excess air supplied and the dew point of the product gas. (b) Taking a basis of 1 mole of methanol burned, calculate the heat (kJ) needed to vaporize and heat the methanol feed, and the heat (kJ) that must be transferred to or from the reactor.

Answer 1