exam Q4

Question 4 A fixed-bed column (10.16 cm diameter) is used in the adsorption of n-butanol from air. The column contains 300 g carbon corresponding to a bed length of 8 cm. Using the data given below on effluent concentration versus time, first plot C/Co versus t and then, estimate the saturation capacity of the carbon and the fraction of the bed used at 0.05 [20%). C Assumption: The C/Co vs time curve is symmetric about C/Co = 0.50, NB. You should first construct the C/Co vs time curve using the data provided. Data for n-butanol on Columbia JXC 4/6 carbon: = No = 58 cm/s (superficial velocity of fluid) Co = 365 ppm T = 25 C P = 737 mm Hg = 0.37 cm (particle diameter) S = 1,194 m/g (internal surface area of solid particles) Po = 0.461 g/cm (bulk density of bed) E = 0.457 (external void fraction of bed) Dp t(h) 1 1.5 2 2.4 2.8 3.3 4 5 C/C 0.005 0.01 0.027 0.050 0.10 0.20 0.29 0.56