Question: Problem 1: In a chromate crystal production process, a solution that is one-third K,Cr, by mass is joined by a recycle stream containing 36.4% K
Problem 1: In a chromate crystal production process, a solution that is one-third K,Cr, by mass is joined by a recycle stream containing 36.4% K Cron, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K,Cr0s; this stream is fed into a crystallizer in which it is cooled (causing crystals of K Cr0to come out of solution) and then filtered. The filter cake consists of K CrO crystals and a solution that contains 36.4% K_Cro, by mass; the crystals account for 95% of the total mass of the filter cake. The solution that passes through the filter, also 36.4% K Cro,, is the recycle stream. Proposed flowchart is shown below to produce crystals from 4500 kg/hr of feed solution (mo). Solve for the following: m2 ma mo m my Crystallizer Evaporator & X = 0.33 ** = 0.494 Filter ms x, = 0.67 x = 0.364 h x = 0.364 a) Complete process flow chart b) Determine process unknowns (m, and x) in all streams c) Determine the recycle ratio d) Determine the crystallization & filtration unit efficiency e) Amount of crystals that will be produced if the fresh feed flowrate is reduced to 1000 kg/hr f) Suggest two, at least, approaches to enhance the rate of crystal production. g) Determine rate of crystals production with the same feed flowrate ( 4500 kg/hr) if no recycle is considered h) Suggest two, at least, approaches to enhance the rate of crystal production i) Determine rate of crystals production with the same feed flowrate (4500 kg/hr) if no recycle is considered
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