Question

A 1000lb-mol/hr stream of gaseous sulfur dioxide is combined with a stoichiometric amount of oxygen at 1000 K and 1 bar.

a) How much heat (in BTU/hr) must be added or removed to keep the mixture isothermal if 40% of the sulfur dioxide reacts to form sulfur trioxide.

b) calculate the final temperature if the reaction is done in an adiabatic reactor and only 10% of the sulfur dioxide reacts.

Answer 1

Note (Assumption): 1) Heat of Formation at 298K for SO₂ and SO₃ are not given in this question ... it is assumed for calculation purpose and 2) C_p as function of Temperature (T) for SO₂ , O₂ and SO₃ are not given in this question ... it is assumed for calculation purpose.

Working methodology remains same ............

After substituting above values, a cubic equaiton will be obtained ....then you have to solve the cubic equation to get the roots (three roots). The one which is positive and real root is the final temperature.