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The liquid-liquid extraction is achieved by feeding the top and the bottom of the column respectively with the heavy and light phases by means of a pump.


This procedure consists in bringing a feed solute into contact with a more akin solvent.
The extraction column is provided with a stirrer throughout its length. The stirrer is powered by a variable speed motor. At the top of the column, an azeotropic separator provides the separation of the two phases.

Teaching objectives

- Determination of the transfer units

- Height of a unit of transfer

- Efficiency of extraction

- Mass balance

- Calculation of the material exchange coefficient

- Calculation of the theoretic number of stages

- Concentration profile in the column

- Practices on a system with three partially miscible components :

- Acetic acid – toluene – water

- Acetic acid – isopropyl ether – water

- Acetic acid – ethyl acetate – water


Technical specifications

- Extraction column in borosilicate glass, H = 600 mm
- 1 Disk stirrer, stainless steel AISI 316 execution variable speed reducer 0-800 rpm - power 300 W
- 2 decanters DN 100, in borosilicate glass
- 4 tanks in polythene, capacity : 30 l ( 2 for feeding and 2 for the refined and extracted product )
- 2 gear pumps with manual control, stainless steel body AISI 316, flow range 0- 40 l/h with check valve
- Speed driver with display
- Solvent flowmeter, in stainless steel and glass, scale : 4 to 40 l/h
- Solution flowmeter, in stainless steel and glass, scale : 4 to 40 l/h
- Electric cabinet, IP 55, with transformers, start/stop switch, emergency stop, security device and synoptic.
- Technical manual



1800 x 800 x 2000 mm


Essential requirements

Power supply : 220 V - 50 Hz