The multi-stage countercurrent extraction process of the laboratory centrifuge is that the feed liquid is added from the left side, the solvent is added from the right side, and the two-phase countercurrent flows. The composition of the two-phase changes step by step between stages. In the countercurrent extraction operation, the thickest product obtained from the left end can reach the concentration that is in equilibrium with the feed solution. Compared with multistage cross flow process, the amount of solvent is reduced and the concentration of solute in the solvent is increased.
In the multi-stage countercurrent extraction process of the laboratory centrifuge, the extracted components can obtain a high extraction rate, and two or more components in the extraction system with large difference in distribution coefficients may also be separated to a certain extent. Multi stage countercurrent extraction with laboratory centrifuge can improve production speed and product yield.