Temperature Effects in a CSTR

Although the assumption of perfect mixing in the CSTR implies that the reactor contents will be at uniform temperature (and thus the exit stream will be at this temperature), the reactor inlet may not be at the same temperature as the reactor. If this is the case and/or it is necessary to determine the heat transferred to or from the reactor, then an energy balance is required. 

The energy balance for a CSTR can be derived from Equation (9.2.7) by again carrying out the reaction isothermally at the inlet temperature and then evaluating sensible heat effects at reactor outlet conditions, that is. 

The nitration of aromatic compounds is a highly exothermic reaction that generally uses catalysts that tend to be corrosive (e.g., HNO3/H2SO4). A less corrosive reaction employs N2O5 

If this reaction is conducted in an adiabatic CSTR, what is the reactor volume and space time necessary to achieve 35 percent conversion of N2O5 The reaction rate is first order in A and second order in B. 

The reaction occurs in the liquid-phase and the concentrations are dilute so that mole change with reaction does not change the overall density of the reacting fluid. Thus, 

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