solvent
phase (RCS=20/80) and lactic acid aqueous solution were mixed
(RSF=1/1) and stirred for 60 min at 20-50 oC. The results are in
Fig. 3, which shows that the highest extraction efficiency (86.3%)
was obtained at 30 oC. Further increase of temperature caused the
decrease of extraction efficiency. This result was caused by the equilibrium
between diffusion and interactions of extraction. The diffusion
of lactic acid increased with increasing the temperature, but
the interactions between lactic acid and tertiary amine decreased.
Although the highest extraction efficiency was obtained at 30 oC,
the 20 oC with moderate extraction efficiency was adopted, considering
the energy consumption.