Question

Answer #1

Data provided in problem statement

Raschig rings nominal size ( d_{n} ) = 25 mm

Operating Tempearure ( T ) = 300 K

Height of column ( l ) = 6 m

Gas flowrate ( G ) = 0.95 kg/ m2s

Air density ( ) can be given as

= ( MW /
V_{stp} ) * ( T_{stp} / T )

Here

MW = molecular weight of air = 29 kg / kmol

V_{stp} = Ideal gas volume at STP = 22.4 L

T_{stp} = Temperature STP = 273 K

= ( 29 / 22.4 ) * ( 273 / 300 ) = 1.178 kg / m3

so

Velocity of air ( u) = G / = ( 0.95 kg/ m2s ) / ( 1.178 kg / m3 ) = 0.806 m /s

Voidage ( e) = 0.71

Specific surface are ( S) = 190 m2/ m3

Now Carman correlation for flow through packed bed can be given as

Wet pressure drop across the column = 411.7084 N/ m2

Estimate the diameter of packed column and percentage flooding
for a system with the following properties:
Vapour rate 2000 m3/h
Vapour density 45kg/m3
Liquid rate 5.0 m3/min L
iquid density 475 kg/m3
Liquid viscosity 7.2 ? 10-5 Pa.s
Consider 2 in. plastic Pall rings and a pressure drop of 80 mm
H2O/m packing. {Hint: Be careful with the units of the
flowrates}.

4.1A membrane made of 0.1 mm thick soft rubber separates pure O2
at 1 atm and 25oC from air at 1.2 atm pressure. Determine the mass
flow rate of O2 through the membrane per unit area and the
direction of flow.
Molar flow rate of oxygen is given by: ???? = ???????? / ???
(????1 ? ????2 )
where S is solubility of oxygen in rubber.
The mass diffusivity of oxygen in rubber at 298 K is DAB = 2.1...

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