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Leaching and Extraction

The document discusses different types of leaching and extraction equipment and processes used to remove soluble materials from solids using solvents. It describes moving bed leaching, extraction batteries, the Shanks process, diffusion batteries, and various types of extractors like the Bollman, Hildebrandt, and fixed bed extractors.

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Earl Fred
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130 views1 page

Leaching and Extraction

The document discusses different types of leaching and extraction equipment and processes used to remove soluble materials from solids using solvents. It describes moving bed leaching, extraction batteries, the Shanks process, diffusion batteries, and various types of extractors like the Bollman, Hildebrandt, and fixed bed extractors.

Uploaded by

Earl Fred
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Leaching and Extraction Moving Bed Leaching

 Removing one constituent from a solid or  The solids are moved through the solvent
liquid by means of a liquid solvent with little or no agitation.
1. Leaching or solid extraction  Used widely in extracting oil from vegetable
- Used to dissolve soluble matter seeds as cottonseeds, peanuts and
from its mixture with an insoluble soybeans.
solid
2. Liquid Extraction Bollman Extractor
- Used to separate two miscible liquid  Contains a bucket elevator in a closed
by the use of a solvent that casing
preferentially dissolves one of them.
Leaching Half – Miscella
 Differs very little from the washing of filtered
solids  Intermediate solvent containing some
 The amount of soluble material removed is extracted oil and some small solid particles.
often rather greater than in ordinary filtration
Full – Miscella
washing and the properties of the solids may
change considerably during the leaching  Strong solution collected at the bottom.
operation.
Hildebrandt Extractor
TYPES OF LEACHING EQUIPMENT
 Consists of a U- shaped screw conveyor with
a separate helix in each section.
Extraction Battery – counter flow of solvent through
a battery of tank. Fixed Bed Extractor
 In this method, fresh solvent is fed to the
tank containing the solid that is most nearly  Based in beet sugar industry
extracted; it flows through the several tank in  Used for the extraction of tanning extracts
series and is finally withdrawn from the tank from the tanbark
that has been freshly charged.  For extraction of pharmaceuticals from barks
and solids and is often processes.
Shanks Process  Countercurrent operation is used in the
 The batteries are kept in countercurrent shanks system.
operation by advancing the inlet and draw off
Agitated Solid Leaching
tanks one at a time as the material is
changed and removed.  Finely ground solid at about 200 mesh
(0.074 mm)
Diffusion Battery

 A series of such pressure tanks operated


with countercurrent solvent flow.

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