Question 3 The flowchart of a steady-state process to recover crystalline chromate (K_CO) from an aqueous solution of th

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Question 3 The Flowchart Of A Steady State Process To Recover Crystalline Chromate K Co From An Aqueous Solution Of Th 1 (389.58 KiB) Viewed 10 times

Question 3 The flowchart of a steady-state process to recover crystalline chromate (K_CO) from an aqueous solution of this salt is shown below: 4500 kg/h 33.3% K,Cro EVAPORAT 49.4% K Cro OR Filtrate 36.4% K,Cro, solution Filter cake CRYSTALIZER K Cro, solid AND FILTER 36.4% K,CrO, solution (the crystals constitute 95% by mass of the filter cake) The process is steady-state. 4500 kg/h of a solution that is 1/3 K-CrO4 by mass is joined by a recycle stream containing 36.4 % K,CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K,CrOs, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of K Cr0to precipitate. The crystals are then filtered out of the solution. The “filter cake” consists of K Cro4 crystals and a solution that contains 36.4 % K-CrO4 by mass, such that the crystals account for 95 % of the total mass of the filter cake. The “filtrate" solution that passes through the filter also contains 36.4 % K_CrO4, and is recycled. Use (K) to denote K,CrO2, and (W) to denote water. What are the (i) mass rate of evaporation, (ii) the mass rate of production of K Cro4 crystals, (iii) the mass feed rates that the evaporator and the crystallizer must handle, and (iv) the recycle ratio? The recycle ratio = (mass of recycle)/(mass of fresh feed). What would be the mass production rate of the crystals if the filtrate was discarded instead of recycled?