2. Here is a problem from when I took this course as an undergraduate. The fundamentals do not change over the decades! Salt is processed in the five units shown on the flow diagram. Feed stream F, consisting of brine (salt and water) is fed to a centrifuge at a rate of 800 kg/h. The water-rich stream L from the centrifuge is mixed with a water-rich stream R recycled from the filter press. This mixture M is sent to an evaporator where water is removed. The wet solids stream T from the centrifuge, leaving at a rate of 320 kg/h, is mixed with the concentrate N from the evaporator and fed to the filter press, where product stream P is filtered from the recycle stream R. a) Perform a degrees-of-freedom analysis for each of the five units as well as the overall process. b) Calculate the flow rate and composition of the product stream P. Answer: 500 kg/h; 96 mass% salt and 4 mass% water Problem 2 F = 800 kg/hr (*'p=0.60 (xwp= 0.40 M (x) =.0.312 (x) = 0.668 #3 #2 Mixer #1 Centrifuge V Evaporatoi L (*S'L = 0.40 (xx) = 0.60 (xs'y = 0.00 (xy = 1.00 R T = 320 kg/t (*s't (*'R = 0.10 (xw'R = 0.90 (xwT N (*S'N = 0.558 = 0.442 (X'N #1 Mixer K #5 Filter (XSK (*w'K P (xsp (xw'P S = salt W = water