The reaction of order 1 A ------> B takes place in the gas phase in a tubular reactor. The desired conversion rate at the exit is 90%. We wish to operate the reactor in an adiabatic regime, however product B degrades at a temperature exceeding 500K.If adiabatic operation is not possible, we will use two tubular reactors in series. The first operating in adiabatic operation up to a temperature of 500K and the second in isothermal operation.

Calculate the amount of heat that must be added or removed from the second reactor to be able to work in an isothermal regime.

Additionnal data: The feed consists of pure A, T0 = 300K, P0 = 10atm, FA0 = 2 kmol/hr, MA = 50kg/kmol, Cp(average) = 3.09 kJ/kg.K, deltaH = -41900kJ /kmole, k0 = 3.27. 106 -h-1 and an activation energy Ea=37700 kJ/kmol. The values of the constant R are R= 8.314 J/mol.K and R = 82.06 atm.cm3/mol.K. The reaction takes place at constant pressure.