First-order reactions in CSTR

Figure 3.9. Straight-line plot for first-order reaction in CSTR, also showing curves given by reactions of higher and lower orders.

Figure 13.21 First-order reaction in CSTR-Separator-Recycle sensitivity analysis for different control structures...

FIGURE 1.8 Comparison of reactor volume required for a given conversion for a first-order reaction in a PFR and a CSTR. 

Example 4.8 Find the yield for a first-order reaction in a composite reactor that consists of a CSTR followed by a piston flow reactor. Assume that the mean residence time is ij in the CSTR and ti in the piston flow reactor. 

Solution The component balance for component A (styrene) for a first-order reaction in a constant-volume, constant-density CSTR is... 

Suppose there are two parallel, first-order reactions in a steady-state CSTR. Show that neither the fed-batch nor fast-fill-and-hold strategies can achieve a bumpless startup if the reactions have different rate... 

For a first-order reaction in a CSTR, compare the predicted performance for completely segregated flow with that for nonsegregated flow. 

From Example 14-4, we conclude that the performance for a first-order reaction in a CSTR is independent of the degree of segregation. This conclusion does not apply to any other order (value of n). The results for n = 0, 1, and 2 are summarized in Table 14.1, which includes equations 14.3-22 to -25. 

Figure 4-9 Comparison of Ca, C, and Cc for parallel first-order reactions in a PFTR (solid ciu es) and CSTR (dashed...

A reactant A in liquid will be converted to a product P by an irreversible first-order reaction in a CSTR or a PFR reactor with a reactor volume of 0.1 m . A feed solution containing 1.0 kmol m of A is fed at a flow rate of 0.01 m min", and the first-order reaction rate constant is 0.12 min . ... 

Fig. 6.2. The evolution of the reactant concentration towards its stationary-state value for a simple first-order reaction in a CSTR a0 = 0.1 mol dm-3, A, = 0.024 s" k, = 8 x 10 " 3 s ...

Fic. 6.3. The dependence of the reactant concentration and the reaction rate kIa5S at the stationary state on (a) flow rate and (b). residence time for a first-order reaction in a CSTR. Rate... 

Fig. 2.6 Time histories of Ca for a first-order reaction in a BR (continuous line) and in a CSTR (dotted line). Initial condition is Cao = 1 molm 3...

Figure 4.3 First-order reaction in a CSTR/separation/recycle system, (a) Conventional control structure, (b) Production rate F4 versus the reactor-inlet flow rate F,.

Figu re 4.4 First-order reaction in a CSTR/separation/recycle system. 

Figure 7.3 also compares the evolution of the concentrations of the intermediate Q and the product in case of two first-order reactions in series in a CSTR with that in a batch or plug flow reactor. For constant density, the mass balance for the reaction components in a CSTR are ... 

TABLE 7-3 Consecutive and Parallel First-Order Reactions in an Isothermal Constant-Volume Ideal CSTR... 

Figure 8.1 gives conversion curves for an isothermal, first-order reaction in various types of reactor. The curves for a PFR and CSTR are from Equations 1.38 and 1.49. The curve for laminar flow without diffusion is obtained from Equation 8.14 and the software of Example 8.2. Without diffusion, the laminar flow reactor performs better than a CSTR but worse that a PFR. Add radial diffusion and the performance improves. This is illustrated by the curve in Figure 8.1 that is between those for laminar flow without di ffusion and piston flow. The intermediate curve is one member of a family of such curves that depends on theparameter f// . IfL // is small, <... 

Figure 13.24 First-order reaction in adiabatic CSTR - Separator - Recycle system...

Figure 13.25 First-order reaction in adiabatic CSTR - Separator - Recycle system Effect of activation energy f) and adiabatic temperature rise (5) on the extent of feasibility region...

The average residence time in the CSTR is the volume V divided by the volumetric flow rate F, or l = V/F. The ratio of CSTR residence time to batch residence time is readily derived for simple kinetic models. For a first-order reaction in a CSTR, the steady-state material balance is... 

Estimate the conversion for the first order reaction in a nonideal tubular flow reactor. The residence time distribution is characterized by measured E function. The mean residence time can be calculated with Equation 3.14 applying the trapezoidal method. Compare the result with the conversion that could be obtained in ideal PER and CSTR for the same mean residence of 10 min. -El = k cf, k = O.lSmin" ... 

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