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Packed Columns Simplified Design Methods For Absorption of Dilute Gas Mixtures in Packed and Trays Towers

The document discusses simplified design methods for absorption towers used in chemical and petrochemical engineering. It provides equations for calculating the height of packed columns and tray towers. An example problem is also included where the height of a tower used to scrub hydrogen sulfide from a gas stream using a triethanolamine solvent is calculated based on the inlet and outlet concentrations, gas and liquid flow rates, and absorption coefficient. The required height is determined to be 15 meters.

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رائد عبد العزيز فرحان
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61 views1 page

Packed Columns Simplified Design Methods For Absorption of Dilute Gas Mixtures in Packed and Trays Towers

The document discusses simplified design methods for absorption towers used in chemical and petrochemical engineering. It provides equations for calculating the height of packed columns and tray towers. An example problem is also included where the height of a tower used to scrub hydrogen sulfide from a gas stream using a triethanolamine solvent is calculated based on the inlet and outlet concentrations, gas and liquid flow rates, and absorption coefficient. The required height is determined to be 15 meters.

Uploaded by

رائد عبد العزيز فرحان
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Chemical and Petrochemical Eng Dept.

Equipment Design
PACKED COLUMNS
Simplified Design Methods for Absorption
of Dilute Gas Mixtures in Packed and Trays Towers
1. Packed Tower

Z = H OG N OG
If equilibrium is linear

2. Tray Tower

Z :- heigh of tower
N :- number of trays
ℓ :- distance between two trays = 0.5 m
If the equilibrium is liner Y∗ = mX

Example :Gas, from a petroleum distillation column, has its concentration of H2S reduced from 0.03
kmol H2S/kmol of inert hydrocarbon gas to 1 per cent of this value, by scrubbing with a triethanolamine-
water solvent in a countercurrent tower, operating at 300 K and at atmospheric pressure. H2S is soluble
in such a solution and the equilibrium relation may be taken as Y = 2X . The solvent enters the tower
free of H2S and leaves containing 0.013 kmol of H2S/kmol of solvent. If the flow of inert hydrocarbon
gas is 0.015 kmol/m2s and the liquid rate is 1.7 times the minimum , calculate height of tower is required
if the overall coefficient for absorption KOG.a may be taken as 0.04 kmol/sm3 .
Solution

M.Sc. Abdulrazzaq S. Abdullah 1

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