HW11ChE 150B F2009

# HW11ChE 150B F2009 - o C in a continuous countercurrent...

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ChE 150B Problem Set 11 Due November 13, 2009 Problem 1 . (20 Points) Using the data below, construct the following graphs: (a) An equilateral ternary diagram of acetone as the solute, water as the carrier, and 1,1,2-trichloroethane as the solvent. Be sure to include the tie lines on the graph. (b) Compute the selectivity of the solute (pure acetone) for solvent (pure 1,1,2- trichloroethane) at each tie line. Then, plot selectivity versus the concentration of 1,1,2-trichloroethane in the carrier (pure water). Acetone-Water-1,1,2-Trichloroethane Compositions on Phase Boundary: Extract, wt% Raffinate, wt% Acetone Water Trichloroethane Acetone Water Trichloroethane 60 13 27 55 35 10 50 4 46 50 43 7 40 3 57 40 57 3 30 2 68 30 68 2 20 1.5 78.5 20 79 1 10 1 89 10 89.5 0.5 Tie-line Data: Extract, wt% Acetone Raffinate, wt% Acetone 56 44 40 29 18 12 Problem 2. (25 Points) One thousand kilograms per hour of a 45 wt% acetone-in-water solution is to be extracted at 25

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Unformatted text preview: o C in a continuous countercurrent system with pure 1,1,2-trichloroethane to obtain a raffinate containing 10 wt% acetone. Using equilateral ternary diagram from Problem 1 , determine the following: (a) the minimum flow rate of solvent, (b) the number of stages required for a solvent rate equal to 1.5 times the minimum, (c) the flow rate and composition of both the raffinate leaving the last stage and extract leaving the first stage, and (d) the flow rate and composition of the raffinate leaving the second stage. Problem 3. (20 Points) For the conditions of Problem 2, find the number of stages required for the separation using a McCabe-Thiele diagram. Plot the operating line for the extractor on the McCabe-Thiele diagram for the condition of minimum solvent-to-feed ratio. [Hint: Read section 8.4 of Seder and Henley to see how the McCabe-Thiele diagram is related to the equilateral triangle diagram.]...
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## This note was uploaded on 01/13/2010 for the course CHEM 1 taught by Professor Pines during the Winter '08 term at Berkeley.

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HW11ChE 150B F2009 - o C in a continuous countercurrent...

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