Liquid – Liquid extraction in a stirred column

Continuous process


  • 2 SS pumps, variable rate.
  • Glass decanter with light phase outlet, heavy phase feeding.
  • Glass column.
  • Stirring shaft, made of 20 SS Rushton type stirrer.
  • Glass decanter with heavy phase outlet, light phase feeding.
  • Inter-phase level setting by lateral crosshead.
  • Polyethylene storage tank, 10 L.


  • 2 flowmeters.


Dim : 140 x 60 x 240 cm – 120 kg
SS tubular framework 40 x 40mm


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The liquid liquid extraction

Liquid-liquid extraction is a fundamental material transfer operation based on the varying solubility of the

components of a mixture. It entails extracting a compound from a solution (solute dissolved in a diluent)

by selective transfer to a second liquid (solvent), non-miscible with the first and with different density.

A stirring device 9,  allows to stir the liquid in the column, increasing the contact between the

two phases and the mass transfer from one to another.


Study of a continuous liquid-liquid extraction

Process parameters

Interphase level determination


Ternary diagram

Mass balance

Column effiency determination (HUT/NUT)