8.17. Extraction of acetone from two feeds. Two feeds —F at 7,500 kg/h containin
ID: 511144 • Letter: 8
Question
8.17. Extraction of acetone from two feeds.
Two feeds —F at 7,500 kg/h containing 50 wt% acetone and 50 wt% water, and F' at 7,500 kg/h containing 25 wt% acetone and 75 wt% water —are to be extracted in a system with 5,000 kg/h of 1,1,2-trichloroethane at 25C to give a 10 wt% acetone rafnate.
Calculate the stages required and the stage to which each feed should be introduced using a right-triangle diagram. Equilibrium data is below
The tie-line data are:
Acetone, Weight Fraction Water, Weight Fraction Trichloroethane, Weight Fraction Extract .6 .13 .27 .5 .04 .46 .40 .03 .57 .30 .02 .68 .20 .015 .785 .10 .01 .89 Raffinate .55 .35 .10 .50 .43 .07 .40 .57 .03 .30 .68 .02 .20 .79 .01 .10 .895 .005Explanation / Answer
No.of equilibrium stages and feed locations ,using right traingled diagram.
Analysis : beacuase the flow rates and compositions ofboth feeds and solvents are given , the mixing point M with the following result :
component Feed Feed ,F solvent mixing point Acetone 3750 1875 0 5625 Water 3750 5625 0 9375 Trichloroethane 0 0 5000 5000 Total 7500 7500 5000 20000Related Questions
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