A packed tower compared to a plate tower for a particular mass transfer operation

Related MCQs

• The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives
• Pressure drop through plate tower as compared to that through packed tower, for the same duty will be
• At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
• In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit).
• For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
• In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
• H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is
• For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower)
• JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
• Operating velocity in a packed tower is usually __________ the flooding velocity.