Question: A liquid mixture of 27 wt% acetone and 73 wt% water is to be separated at 25 o C into a raffinate and extract by

A liquid mixture of 27 wt% acetone and 73 wt% water is to be separated at 25^oC into a raffinate and extract by multistage, steady-state, countercurrent liquid-liquid extraction with a solvent of pure 1, 1, 2-trichloroethane. Phase equilibrium data are given in Exercise 8.11. Determine:

(a) The minimum solvent-to-feed ratio to obtain a raffinate that is essentially free of acetone.

(b) The composition of extract at the minimum solvent-to-feed ratio.

(c) The composition of the extract stream leaving stage 2 (see Figure), if a large number of equilibrium stages is used with the minimum solventrate.

Solvent S Extract EN-1 EN En +1 Ез En E, E2 N-1 п Figure 8.13 Countercurrent-flow, N-equilibrium-stage liquid-liquid

Solvent S Extract EN-1 EN En +1 En E, E2 N-1 Figure 8.13 Countercurrent-flow, N-equilibrium-stage liquid-liquid extraction cascade. RN-1 Raffinate R, Rp-1 R2 R1 RN-2 RN Feed

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Subject Extraction of acetone A from water C by 1 1 2trichloroethane S at 25 o C Given Liquid mixture of 27 wt A and 73 wt C Liquidliquid equilibrium ... View full answer

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