1 reply to this topic

[Rahimzadeh]

Dears:

 

In our gas plant, gas sweetening is done using a DEA solution.

 

As per the plant design, the concentration of the DEA solution is 30 wt. percent.  However, at the present time our feed gas flow rate has been reduced to 50% of the normal design.

 

What are your comments on reducing the DEA solution concentration or reducing the solution circulation rate?

I would be very appreciative if you could send me or refer me to an article or any data.

 

Best Regards

 

M.R.Rahimzadeh

Edited by Art Montemayor, 19 October 2014 - 09:54 PM.
grammer, composition

[RockDock]

It really depends on your plant. Look at your ProMax model and see if the column flooding goes below 40%(or what your trays/packing has as a lower bound design) if you simply reduce the circulation rate while maintaining your previous rich loading (should be around 0.35 if you have carbon steel).

 

If the flooding is too low, decrease the concentration of DEA and increase the circulation rate until you are in an acceptable flooding range.

 

I don't have an article to show you, but this is a fairly standard. If you just decrease the concentration, you will be boiling a lot of water unnecessarily in the reboiler.