Raining-bucket contactor

Kuhni column Graesser raining-bucket contactor... 

FIGURE 14 Graesser raining-bucket contactor. [Reprinted by permission of Chem. Eng. 75(18), 76 (1968).]... 

Mechanical rotation Mixer-Settler RDC Oldshue-Rushton Column ARD Column Ktkhni Column Raining Bucket Contactor... 

Raining Bucket Contactor. This contactor consists of a series of scoops located on a slowly rotating, baffled rotor within a horizontal cylindrical vessel (Fig. 21). An interface is maintained near the middle, and the scoops capture and then allow one phase to rain through the other, and vice versa, once each revolution. 

There is little, if any, control of droplet size, but the raining bucket contactor is the only one that disperses each phase in the other. If the flow ratio differs greatly from unity, backmixing of the low flow phase can be serious, and line out with changed operating conditions can take a long time. 

Proprietary Extractors. Manufacturers or proprietary design extraction equipment (such as the Podbielniak Centrifugal Extractor or the RTL (raining bucket) Contactor) provide catalogs listing the relative capacities of the various sizes of equipment which are offered. Pilot equipment is usually available for determining extraction performance, and the manufacturer utilizes both the pilot data and experience with similar systems to provide assured commercial designs. 

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