Overview of Energy Balances

What is the plan In the following pages we manipulate Equation (11-9) in order to apply it to each of the reactor types we have been di.scussing batch. PER. PER, and CSTR. The end result of the application of the energy balance to each type of reactor is shown in Table 1 l-I. These equations can be used in Step 5 of the algorithm discussed in Example El 1-1. The equations in Table 11-1 relate temperature to conversion and to molar flow rates and to the system parameters, such as the overall heat-transfer coefficient and area. Ua, with the corresponding ambient temperature, Ta. and the heat of reaction, 

CSTR with heat exchanger, UA — tmd targe coolant Row rate. 

The equations in Table 11-1 are the ones we will use to solve reaction eiqpneeriiq problems with heat effects. 

I Nomenclature U = overall beat-uanster coeflicienL (J/m s K) 4 = CSTR heat-exchange area, (m ) a = PFR heat-exchange area per volume of reactor. (mVm ) Cp = mean heat capacity of species i, (J/mol/K) Cp = the heat capacity of the 

Examples of How to Use Table 11-1. We now couple the energy balance equations in Table II-1 with the appropriate reactor mole balance, rate law, and stoichiometry algorithm to solve reaction engineering problems with heat effects. For example, recall the rate law fcH a first-order reaction. Equation (El 1-1.5) in Example 11-1. 

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TABLE 5. Overview of energy balance data for re-using of a polyolefine fraction, acc.[10]... 

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