The choice of extraction method depends primarily on the physical properties of the basic material and its particle size.
THE CHOICE OF EXTRACTION METHOD
The
choice of extraction method depends primarily on the physical properties of the
basic material and its particle size. If this material is a coarse, rigid
powder, beds of high permeability will form and percolation can be adopted. The
expense of finer grinding is avoided and the subsequent separation of solids
and liquid is facilitated. The process can be conducted in such a way that a
con-centrated product is obtained. Other materials, such as fine powders or
com-pressible animal tissues, will not form permeable beds, and the alternative
method must be adopted. Some compensation for the difficulties of separation
and the dilution of the extract during washing may be found in a more rapid and
more complete extraction. This is due to the use of finer powders, intimate
contact between solids and liquid, and the absence of channeling.
The
use of pressure extends the application of percolation to materials that form
beds of low permeability. Alternatively, permeability may be increased by
grinding the solids with a supporting material such as glass wool.
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