A pilot-scale tower packed to a height of 6.0 ft with 5/8- inch ceramic Raschig rings is

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A pilot-scale tower packed to a height of 6.0 ft with 5/8- inch ceramic Raschig rings is used to study the absorption of carbon disulfide (CS2, solute A) from nitrogen gas (N2) into a liquid absorbent solution at 24°C. The diameter of the tower is 0.50 ft. An inlet gas stream of total molar flow rate 2.0 lbmole/h and composition of 3.0 mole% CS2 enters the bottom of tower. The outlet gas composition of CS2 is 0.50 mole%. Pure solvent (molecular weight of 180 g/mole) of total molar flow rate 1.0 lbmole/h enters the top of the tower. The composition of CS2 in the outlet liquid is 4.8 mole%. Over the concentration range of operation, Henry’s law is valid with PA = Hx*A, where H = 0.46 atm at 24°C. The total system pressure in the tower is 14.7 psig (gage pressure). Additional data: gas density, ρG = 0.16 lbm/ft3; liquid density, ρL ˆ 75 lbm/ft3; liquid viscosity, µL = 2.0 cP. 

a. Determine the minimum solvent flow rate ALs,min

b. Based on the conditions of operation, estimate the Kya required for the packed-tower height of 6.0 ft. 

c. At the conditions of operation, it can be calculated that the tower operates at 26% of the flooding velocity (G' = 0.26 G'f) . Recommend a new size of ceramic Raschig ring packing, which will bring the gas velocity within the range of 40–45% of the flooding velocity at the fixed tower diameter of 0.5 ft.

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Fundamentals Of Momentum Heat And Mass Transfer

ISBN: 9781118947463

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

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