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Sieve Tray Efficiencies In Physical Solvent/light Hydrocarbon Gas Abso

sieve tray sieve tray efficiency efficiencies tray efficiency sieve tray efficiency absorber column tower

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#1 hudsonhawke

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Posted 11 March 2014 - 05:20 PM

Hello I have a quick question about sieve tray efficiencies in absorber columns. I am working on a design project as part of my engineering degree and need to specifiy a sieve tray efficiency for our absorber column.

 

The absorber has a light hydrocarbon gas stream coming into the column under the bottom tray, and contains various mercaptans and disulphides to be removed via a physical solvent, specifically purisol (NMP or N-methyl-2Pyrrolidone). We have decided on 24" tray spacing, 2" weir height, 9.5mm hole sizing with approximately 6% open hole fractional area in the active (bubbling) area of the sieve tray.

 

Flows are approximately 125 000 kg/h of Liquid and 48 000 kg/h of vapor per tray. The pressure of the system is approximately 6000 kPa and the temperature is between 20-30 °C depending on the stage.

 

What I am curious about are typical sieve tray efficiencies for a process similar to this, along with links to literature backing up this value.

 

Any help on this matter is very appreciated, thanks.

 

 



#2 a.aryan

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Posted 09 April 2014 - 06:24 AM

The modeling and prediction of tray efficiency is a complex subject worthy of a PhD in itself.

 

In the first instance I would recommend you use the O'Connell correlation for plate absorbers. Reference given below:

 

H E O’Connell

Plate Efficiency of Fractionation Columns and Absorbers

Trans AIChE, Vol 46, p-741-755, 1946



#3 RockDock

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Posted 15 April 2014 - 11:19 AM

This may be helpful:

 

http://www.bre.com/p...val REVISED.pdf






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