A polluted air stream flowing at 12,000 acfm at 90F and 1 atm has a concentration of 500 ppm of ethylbenzene (C3H10). Pilot plant studies of the adsorption process indicate that 11 lbm of ethylbenzene will be adsorbed per 100 lbm of carbon during normal everyday operations. Assume this carbon has a bulk density of 25 lb/ft? and the bed is 1.5 feet deep. If we use enough carbon to make the superficial gas velocity in bed equals 100 ft/min, what would be the run time of this bed? 47.4 hour 2830 hour 5.21 hour 312.5 hour According to the Union Carbide equation, for an activated-carbon bed, when the superficial gas velocity increases by 10%, the pressure drop across the activated-carbon bed will increase by more than 10% decrease by 10% not change decrease by more than 10% increase by 10%