Extraction Technologies for Medicinal and Aromatic ... - Capacity4Dev

5 DECOCTION AND HOT CONTINUOUS EXTRACTION TECHNIQUES
5.5.2.3 Bonotto Extractor
The Bonotto extractor is used for counter-current extraction according
to the immersion method. The solid material is transported by the
mixer on a tray until it reaches the open sector where it falls onto the next
tray. The screw conveyor at the outlet withdraws the extracted solid material
(underfl ow) and prevents the solution from fl owing out of the extractor.
5.5.2.4 Bollmann Extractor
Figure 7: Bonotto extractor
The fresh solvent is added during the upward movement of the
baskets so that this part operates in counter current. The already preloaded
solution is withdrawn from the bottom of the extractor and enters the
downward-moving baskets so that this part of the extractor operates in a
co-current way. The full miscella is withdrawn at the bottom of the extractor.
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