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Amine Sweetening - ProMax

Amine Sweetening - ProMax

Dear Friends,

I am currently doing a simulation on CO2 removal unit using ProMax program. I have some issues in simulating my stripper column.

I have simulated the absorber column, but when it goes to stripper column it's unsolved

below is the message I got from ProMax:

Error: The outer loop failed due to an error in the Kb parameters
Failed blocks:

I tried to go though the model but I have got the clue to it. Could anyone help me out with this problem?



RE: Amine Sweetening - ProMax

Honestly this is a new one. I've been running this software for decades and haven't seen this error - you need to contact their helpdesk to see what's going on.

RE: Amine Sweetening - ProMax

It's a numerical failure in the Boston-Sullivan Kb method. First, double check your inputs. Incorrect inputs or unrealistic scenarios are the most common causes of convergence failure. Example: setting up a system in a way that the purity of the bottoms product (lean amine in this case) is less than the feed.

If you believe that your inputs are correct, the column pressure, reboiler duty, rich amine quality, etc. are good, then try changing convergence methods. Switch from Boston-Sullivan to Composition-Dependent. See if that helps.

Ammonia accumulation in the regenerator can also cause convergence issues.

If all else fails, as maddocks said, contact BR&E support.

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