Question #233510

How do you choose minimum solvent required for the single stage extraction? Explain.

Expert's answer

n the case that carrier and solvent are immiscible, the concentration of solute in extract and raffinate can be graphically depicted with the equilibrium curve in the loading diagram. Together with the volumes of feed and solvent, the mass balance for the solute leads to the amount of solute that can be recovered.

Whenever the miscibility of the two phases varies and is dependent on concentration, a triangular diagram is employed . Here the three corners of the equilateral triangle stand for the pure components, the solvent S, the carrier T and the solute C. Each side of the triangle represents binary mixtures, each point within the triangle a ternary mixture. Since the sum of the perpendicular lines of any point in the triangle equals the height of the triangle, the length of these lines corresponds to the concentration of each component.

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