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Reactor Design 387

Table 7.9 Calculation Procedure for Sizing Batch Reactors_______

1. Calculate the reaction volume, Vr, from Equations 7.8.3,7.8.5,7.8.6, and 7.8.21.
2. Select a standard reactor size (rated capacity) from Equation 7.8.7

3. Calculate the initial heat-transfer rate, Q Ro, from Equations 7.8.1, 7.8.2, 7.8.4, 7.8.18 to
7.8.20.

4. Determine if the jacket area, Aj, is sufficient.
5. Calculate the jacket heat-transfer rate, Qj, from Equations 7.8.8 to 7.8.10 and Equation
7.8.22.

6. Determine if Qj is sufficient from Equation 7.8.11.

7. If not, determine if the coil area, AC, is sufficient.
8. Calculate coil heat-transfer rate, Q c, from Equations 7.8.12 to 7.8.14 and Equation 7.8.23.

9. Determine if Qc is sufficient from Equation 7.8.15.

10. If not, determine if the jacket + a coil areas are sufficient.
11. Calculate the jacket + coil heat-transfer rate, Qj + Qc-

12. Determine if Qj + Q c is sufficient from Equations 7.8.15.
13. If not, then an external heat exchanger is necessary. The area may be estimated by using
the approximate method outlined in Chapter 4.
14. Calculate the mixer power required from Equations 7.8.16 and 7.8.17.

Table 7.10 Cycle Times for a Batch Polymerization Reactor. (Source
Ref. 16)._________________________________

Activity Time, h

Charge feed to the reactor 1.5-3.0
Heat to reaction temperature 1.0-2.0
Carry out reaction. Varies
Empty and clean reactor 0.5-1.0

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