Homework 10

# Homework 10 - ChE 150B Problem Set 10 Due November 4 2009...

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ChE 150B Problem Set 10 Due November 4, 2009 Problem 1. It is desired to reduce the ammonia content of 0.05 m 3 /s of an ammonia-air mixture (300 K and 1 atm) from 5.0 to 0.04 mol% by water scrubbing. There is available a 0.3-m-diameter tower packed with 25-mm ceramic Raschig rings to a depth of 3.5 m. Is the tower satisfactory, and if so, what water rate should be used? At 300 K, ammonia- water solutions follow Henry’s law up to 5 mol%, with m = 1.414. Liquid: Density = 998 kg/m 3 Viscosity = 0.8 cp Diffusivity = 1.64 x10 -5 cm 2 /s Gas: Viscosity = 1.84x10 -5 Pa-s Diffusivity = 0.28 cm 2 /s Mass transfer is controlled in the liquid phase such that K y = k L c L /m, where K y is the overall gas- phase mass transfer coefficient, k L is the liquid-phase mass transfer coefficient, and c L is an empirical constant related to packing type. The value of k L can be calculated from the following expression: 5 . 0 757

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Homework 10 - ChE 150B Problem Set 10 Due November 4 2009...

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