Jacket Zoning of a Batch Reactor

Consider the jacket zoning of a batch reactor to determine the times required for a temperature adjustment step [14], Wc is replaced by nzWz and the jacket outlet temperature t2 by tm in Equation 13-50. The heat balance for cooling is expressed by ... 

ASPECT RATIO (R) IN JACKET ZONING AND SCALE-UP OF A BATCH REACTOR ... 

To reduce the pressure drop, a batch reactor with a half-pipe jacket of length L and flowrate W can be partitioned into a two-zone jacket, each with a length L/2 and each supplied with W jacket flowrate. This doubles the jacket flow at a lower pressure drop in each zone. The flow in each zone can then be increased to increase the outside and overall heat transfer coefficients, which is similar to those of the single-zone jacket. 

Effect of jacket zoning in a scale-up batch reactor... 

The jacket of a pilot plant batch reactor is divided into three zones. Using the data in Example 13-2, determine the outlet temperature, the heat removed, and the cooling time for both pilot and full-scale batch reactors. 

Suspension polymerization of vinyl monomers is usually carried out in batch reactors. However, the feasibility of continuous suspension polymerization has been reported in some literature. A multiple-reactor system for continuous suspension polymerization of vinyl chloride is illustrated in Fig. 6 [15]. Monomer, water, initiator, and suspending agents are fed to a vertical tower reactor equipped with a multistage stirrer. The reaction mixture of about 10% conversion is then transferred to the second and third reactors, which contain blade stirrers. Each reactor is jacketed for heat removal. Plug flow of the polymerization mixture is maintained in the reaction zones. 

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