2- A tubular flow reactor is to be designed to produce butadiene from butene by dehydrogenation (gas-phase reaction). The first-order reaction rate expression is written in terms of the partial pressure of butene as CH, CH + H2 (-cats)-kPcalls mol/L. h The constant k has units of mol(hr L.atm). The reaction is endothermic, the reactor is often operated adiabatically; therefore, steam is often added to the feed to provide thermal energy for the reaction. For this reactor, the feed is a mixture of 10 mol of steam for each mole of butene. The reactor pressure is 2 atm and the feed temperature is 650° C. Values of the rate constant at different temperatures are given in the following table: T(K) 922 A 900 11.0 4.90 877 2.04 855 832 0.85 0.32 Assume that the heat of reaction is a constant 1.1 x 10' J/mol butene. The heat capacity of the feed stream may be considered constant at 2.1 kJ/kg K. a. Calculate the reactor volume for a 20% conversion of butene if the reactor is operated isothermally at 650° C with a total inlet molar flow rate of 11000 mol/h. b. Determine the reactor volume for 20% conversion of butene for a total inlet molar feed rate of 11000 mol/hr in an adiabatic reactor.