BUCHI Extraction Unit E-816 SOX - Manual (Page 19)

4 Description of function
19 E-812/816 Soxhlet Operation Manual, Version B
4 .2 Functional principle of a Soxhlet extraction
The Extraction Unit E-812/816 Soxhlet is designed to extract fat quickly and product-friendly from
food and feed. Thereby the sample is extracted in running cycles. The extraction process consists of 3
steps decribed in the following.
1
2
3
4
1
5
6
7
a Cooling water
b Receiving funnel
c Solvent tank connection d Optical sensor
e Soxhlet extraction chamber with glass sample tube
f Magnetic glass valve
g Beaker
Fig. 4.2: Schematic overview over an extraction position
4 .2 .1 Step 1 - extraction
The solvent evaporates and the vapor rises up to the condenser. From there the condensed solvent
flows into the 10 ml receiving funnel. When the receiver is full, the solvent flows back into the sample
through the 5 holes of the receiving funnel.
The tank valve and the glass valve are closed.
The solvent level increases up to the optical sensor. The sample is extracted.
The optical sensor detects the solvent level and opens the glass valve. The solvent containing the
extract flows back into the solvent beaker.
When the programmed number of cycles is reached and /or if the extraction time is over the system
goes to the next step.