Equipment selection impeller type

A qualified mixing equipment supplier can assist with process sizing, equipment selection, impeller options, capital versus operating cost evaluation, testing, reliability, and service. In this chapter we describe each type of support and its importance in the equipment selection process. Criteria for choosing a qualified supplier are identified. 

In practice, it is often not possible to calculate the selectivity for this type of process from first principles. Experimental studies have to be done under various conditions, leading to an empiricd optimum on a small scale. It has been shown in section 5.2.2 that the selectivity can be sensitive to the meso-mixe(hiess, and that these can both decrease on larger scales. It may be practical to study the reaction first in a well mixed semi-batch reactor, preferably equipped with an effective turbine impeller, or propeller. The feed tube should end in the exit flow of the impeller. With this equipment one measures the influence of the feed rate on the selectivity. It may be that a sufficiently high selectivity is obtained when the feeding time has a certain minimum value. The specific energy dissipation should be measured or calculated. 

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