Extraction Technologies for Medicinal and Aromatic ... - Capacity4Dev

EXTRACTION TECHNOLOGIES FOR MEDICINAL AND AROMATIC PLANTS
made into a series with any of vessels as the fi rst of the series. The use
of an extraction battery is illustrated in Figure 3, which shows the simplest
arrangement of three vessels.
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S 4 3 2 F 1
A B C
3 2
A B C
E 4
P 1
2 F 1 S 4 3
A B C
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3
A B C
P 1 E 4
3 2 F 1 S 4
A B C
3 2
A B C
P 1 E 4
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Figure 3: Extraction battery
3.6 Percolation (Exhaustive Extraction)
3.6.1 General Process of Percolation
In this process, an organized vegetable drug, in a suitably powdered
form, is packed in a percolator and the solvent is allowed to percolate
through it. Although some materials (e.g. ginger) may be packed directly into
the percolator in a dry state, this may cause difficulties with other drugs. With
the addition of solvent, the dry material swells and this swelling increases
with increasing aqueous nature of the solvent. This swelling reduces or blocks
the flow of the solvent, thus seriously affecting the extraction process. Fur-
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