Project ForgeA multistage countercurrent liquid-liquid extractor separates solute C from a binary A-C feed using solvent B, with solvent recovered from raffinate R by distillation (giving solvent-free raffinate P). On the ternary diagram, line PB crosses the binodal at U and T. The raffinate coming out of the EXTRACTOR (before solvent removal) is represented by the point:
- AT
- U
- CV
- DW
Explanation
U lies on the raffinate-side branch of the binodal curve (the A-B-rich, low-C phase boundary), consistent with it being the physical raffinate-phase composition exiting the last equilibrium stage of the extractor, unlike T which lies on the extract-side branch.
Source: GATE CH 2015 (2015)
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