Kiihni column

Some examples of mechanically agitated contactors are the rotating-disk contactor (RDC), Karr, Oldshue-Rushton, Scheibel, and Kiihni columns shown in Figure 11. 

The Kiihni column employs radial flow impellers located between perforated plates for compartmentalization. The first Scheibel column used wire mesh zones to promote coalescence and limit backmixing between turbine-agitated mixing zones. A later Scheibel column used a shrouded radial impeller and multiple ring baffles to direct most of the rotor s energy towards dispersion and away from axial mixing. 

Kiihni Column Like the Scheibel column, the Kiihni column uses shrouded (closed) turbine impellers as mixing elements on a central shaft (Fig. 15-49). Perforated partitions or stator plates extend... 

In Kiihni columns mixing zones (with centrifugal mixers) are separated by perforated plates where the opening ratio (free cross-sectional area) may be adjusted to the desired operating conditions. Possible operating are mixer-settler mode and dispersion mode. 

II Separation efficient of a QVF-MCE and Kiihni column as a function of the mixer revolutions n and the total load B. 

Rotating-Impeller Columns A number of different rotating-impeller column extractors have been proposed and built over the years. Only the Scheibel and Kiihni designs are reviewed here. For information about the Oldshue-Rushton design, see the previous edition of this handbook. Also see Oldshue, Chap. 13.4 in Handbook of... 

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