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Prebe 563 We plan to move to the press ramby absoplion in water which te B Chemicals A and Brea in the liquid as follows Al-BD)--RID). ACal B has a negligible vapor pressure, hence des into the bus phase We plan to do this absorption in the packed hed nor an agitated tank contacto ) What volume of ontactor is uceded? (b) Where does the resistance of absruption reaction lie! Data For the gas stream: F,- 90 000 mol/hrala 10 Pa Pa = 1000 Pa PAos= 100 Pa Physical data -3.6 X 10 5in /hr Cu = 55 556 mol H,O/m' liquid, at all. Cs For the packed bed F = 900 000 molhr Cu = 55.56 molim ka = 0.36 mol/hr-m'. Pa K-72 hr- 1 = 110 mm - V/V = 0.06 For the agitated tank F-9000 mol/hr C = 5556 mol/m (about 10% B) k4 = 0.72 mol/hr.m. Pa = 144 hr! a = 200 mm - V.V 0.9 Note that F, and Cpa are very different in packed beds and can contactors, and here is the reason why. Packed columns need F/F - 10 for satisfactory operations. This means large and so as not to waste reactant B, it is introduced in low concentration. On the other hand, tank contactors do not have this flow restriction. Thus we can use low and inghias long as we introduce sufficient B to react with A