Leaching Kennedy extractor

The Kennedy extractor (Fig. 18-87), also requiring little head-room, operates substantially as a percolator that moves the bed of solids through the solvent rather than the conventional opposite. It comprises a nearly horizontal line of chambers through each of which in succession the solids being leached are moved by a slow impeller enclosed in that section. There is an opportunity for drainage between stages when the impeller lifts sohds above the liquid level before dumping them into the next chamber. Solvent flows countercur-rently from chamber to chamber. Because the solids are subjected to mechanical action somewhat more intense than in other types of... 

The Kennedy extractor [38], a modem arrangement of which is indicated schematically in Fig. 13.19, is another stagewise device which has been in use since 1927, originally for leaching tannins from tanbark. It is now used for oilseed and other chemical leaching operations. The solids are leached in a series... 

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