A multi-stage, counter current liquid-liquid extraction is used to separate solute C from a binary mixture (F) of A and C using solvent B. Pure solvent B is recov- ered from the raffinate R by distillation, as shown in the schematic diagram below. F R Extractor Distillation B B Locations of different mixtures for this process are indicated on the triangular diagram below. P is the sol- vent-free raffinate, E is the extract, F is the feed and A is the difference point from which the mass balance lines originate. The line PB intersect the binodal curve at U and T. The lines PA and FB intersect the bimodal at V and W respectively. F W E P V A B The raffinate coming out of the extractor is represented in the diagram by the point