## (solution) Can you have me with part d) only? I solved part a, b, and c.

Can you have me with part d) only? I solved part a, b, and c. Please help me with part d) only.

An evaporation?crystallization process of the type described in Example 4.5-2 is used to obtain solidpotassium sulfate from an aqueous solution of this salt. The fresh feed to the process contains 19.6wt% K SO . The wet filter cake consists of solid K SO crystals and a 40.0 wt% K SO solution, in aratio 10 kg crystals/kg solution. The filtrate, also a 40.0% solution, is recycled to join the fresh feed.Of the water fed to the evaporator, 45.0% is evaporated. The evaporator has a maximum capacityof 175 kg water evaporated/s. a)Assume the process is operating at maximum capacity. Draw and label a flowchart and do thedegree-of-freedom analysis for the overall system, the recycle?fresh feed mixing point, the evaporator,and the crystallizer. Then write in an efficient order (minimizing simultaneous equations)the equations you would solve to determine all unknown stream variables. In each equation, circlethe variable for which you would solve, but don?t do the calculations. b) Calculate the maximum production rate of solid K SO , the rate at which fresh feed must besupplied to achieve this production rate, and the ratio kg recycle/kg fresh feed. c) Calculate the composition and feed rate of the stream entering the crystallizer if the process isscaled to 75% of its maximum capacity. d) The wet filter cake is subjected to another operation after leaving the filter. Suggest what it mightbe. Also, list what you think the principal operating costs for this process might be

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Sep 13, 2020

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