An activated-carbon bed that is used in a benzene recovery system. The system is online for one hour and is regenerated for one hour. The influent gas stream contains 5000ppm benzene (by volume) at 1.0 atm and 35C. The operating capacity of the bed is 5kg Benzene 50kg carbon. The physical properties of the carbon are as follows: Bulk density = 550kg/m3 , void fraction = 0.4, and particle size = 4x10 (0.003m). Determine the pressure drop across the bed from EQ 1, EQ 2 and Figure 1.

Superficial velocity, m/s D(1)G2Pgc3dpg=dpG150(1)+1.75 where = void fraction, ft3 void /ft3 packed bed dp= particle diameter, ft g= gas density, lbm/ft3 D= bed depth, ft G= gas superficial mass flux, lbm/hrft2 = gas viscosity, lbm/hrft P=0.37D(100V)1.56 where P= bed pressure drop, in. H2O D= bed depth, in . V= superficial gas velocity, ft/min