Extraction Technologies for Medicinal and Aromatic ... - Capacity4Dev

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5 DECOCTION AND HOT CONTINUOUS EXTRACTION TECHNIQUES 5.5.1 Continuous Extraction For continuously operating extraction, percolation and immersion are used. 5.5.1.1 Percolation The solvent passes through the non-moving solid material and extracts the soluble active constituents. One advantage of this method is that the solid material requires little mechanical treatment because it does not need to move in the percolator while the product passes in the solution. Moreover, since self-fi ltration takes place, there is minimum content of fi ne solid particles in the extract. 5.5.1.2 Immersion In this process, the solid material dips completely into the solvent and is mixed with it. Therefore, no special percolation properties of the solid material are necessary. The disadvantage is that no self-fi ltration of the extract solution takes place. Therefore, a fi ltration step has to be added. 5.5.2 Continuous Extraction Equipment 5.5.2.1 Continuous Horizontal Extractor The solid material is placed in baskets and comes in contact with the solvent by percolation. The fl ow of solvent through the extractor is counter-current to the fl ow of solid material. Figure 5: Continuous horizontal extractor 98
EXTRACTION TECHNOLOGIES FOR MEDICINAL AND AROMATIC PLANTS 5.5.2.2 Hildebrandt Extractor The solid material is extracted according to the immersion method. Screw conveyors are installed in the extractor for transporting the solid material. Again, the solvent fl ows counter-current to the solid materials through the extractor. Figure 6: Hildebrandt extractor 99
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Extraction Technologies for Medicin
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CONTRIBUTORS Chapter 6 Aqueous Alco
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EXTRACTION TECHNOLOGIES FOR MEDICIN
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Extraction Technologies for Medicinal and Aromatic ... - Capacity4Dev

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