2. A 0.5 m long column was packed with dry silica gel beads (true density = 1264 kg/m3) such that the bulk density of the packed bed was 670 kg/m3. Feed containing 0.00279 kg of solute per kg of solvent enters the bed at a rate of 10 kg solvent per second per m2 cross-sectional area. The density of the solvent is 866 kg/m3 while the equilibrium relationship can be approximated by CB = 3 Cv. Determine the breakthrough time if it is known that 90% of the bed capacity is utilized at the point of breakthrough.