Question

3. Three CSTR's are to be used in series. The second reactor has a volume twice that of the first and third reactors. The influent flow has a concentration of 150 mg/l of species A at 100 gal/min. The rate constant for the second order reaction is 0.007 l/mg-h. What is the mean residence time and volume in each reactor if 80% of A is converted in each reactor?

Answer 1

→ Joo -= +kt A 150 hor) Ao = 150 mg/L ; A = 80 x 150 = 120mg/L K = 0.007 lit = 0.0078103 t/hor . mg- hot hos Second order reaction. I to 120 = I +17)xt (tro) (ort) & t = 2.38 X 10 4 hars Corg = 0.0143 min Volume (V) = Qxt = 100 X 0.0143 -1.43 gallons (or) *V3, VI = 0.191 ft 3 Ve=2X0.191= 0.382 ft 3 3 8

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