Continuous stirred tank reactor component balance

In an ideal continuous stirred tank reactor, composition and temperature are uniform throughout just as in the ideal batch reactor. But this reactor also has a continuous feed of reactants and a continuous withdrawal of products and unconverted reactants, and the effluent composition and temperature are the same as those in the tank (Fig. 7-fb). A CSTR can be operated under transient conditions (due to variation in feed composition, temperature, cooling rate, etc., with time), or it can be operated under steady-state conditions. In this section we limit the discussion to isothermal conditions. This eliminates the need to consider energy balance equations, and due to the uniform composition the component material balances are simple ordinary differential equations with time as the independent variable ... 

EXAM PLE 2.5. The component balance equation for an irreversible /)th-order. non-isothermal reaction occurring in a constant-volume, variable-throughput continuous stirred-tank reactor (CSTR) is... 

If component i participates in several chemical reactions in a well-mixed continuous-stirred tank reactor (CSTR) with volume Vcstr, then the macroscopic mass balance at large mass transfer Peclet numbers is... 

The performance equation for a continuous stirred tank reactor (CSTR) was developed in Chapter 4. We use the same equation now but with a complex rate equation replacing the simpler one of the earlier chapter. We describe the method for any complex reaction consisting of N components and M reactions. The following material balances can be written for the different constituents of the complex reaction at hand (see Figure 11.2) ... 

The more complex case of the continuous stirred-tank reactor (CSTR) can be analyzed in a similar way as that of the plug-flow reactor (Section 6.2.3.2). Again considering the reversible exothermic reaction A B, the mole balance equation for component A at steady-state conditions is... 

Because component concentrations are uniform throughout a continuous stirred tank reactor, a mass balance can immediately be constructed over the entire reactor. At steady-state conditions, the following algebraic equation is obtained describing the mass balance equation for a component A over the entire continuous stirred tank reactor ... 

When the reactant ratio is unity (i.e., 0A= 1), the mass balance for component A in the continuous flow stirred tank reactor is... 

Employ the material-balance data to determine the reaction rate. In a continuous-flow stirred-tank reactor, the material balance for component A is as follows at steady state ... 

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