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Q#1 GATE CH 2015 MCQ +2 marks -0.66 marks

A multi-stage, counter-current liquid-liquid extractor is used to separate solute C from a binary mixture (  ) of  and  using solvent . Pure solvent  is recovered from the raffinate  by distillation, as shown in the schematic diagram below.

original image


Locations of different mixtures for this process are indicated on the triangular diagram below. P is the solvent-free raffinate, E is the extract, F is the feed and  is the difference point from which the mass balance lines originate. The line PB intersects the binodal curve at U and T. The lines  and FB intersect the binodal at V and W respectively.

                 original image

The raffinate coming out of the extractor is represented in the diagram by the point:

T

U

V

W

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