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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...

The design cases that I have seen all have any dehydration being performed after the 3rd stage of compression. As others have mentioned, the first three stages will be dehydrating the gas themselves. If you look at the saturation curve, the water content of the acid gas reaches a minimum...

AggieCHEN04, Here's a long one...but hang in there. I've looked at the system a bit more...I don't think that it is going to help you in your case. It's not going to increase the capacity of your amine system, especially if you already have a condenser for your regenerator column. If you...

AggieCHEN04, I've seen a case where this was done. There is no condenser on the stripper, and the overhead is sent around to a two stage stripper for the rich amine coming out of the contactor. The loading of the rich amine was not greatly affected (was reduced by about 0.03 mol/mol)...

Colourfulfigs, The answer is yes. But remember that steady state operation is something that is rarely seen in a plant, no matter what people say (depending on your definition of steady state that is). So you're probably not going to get the model to match to 1%, which is the change that you...

If there isn't any vaporization of the liquid you will often see an increase in temperature, albeit small. This is especially the case for water and is sometimes referred to as a "reverse JT effect". JT systems are typically used to lower temperature by vaporizing a portion of the liquid...

AggieCHEN04, The system that you have described above isn't likely to work well. You're not going to be able to use the acid gas from the top of the regenerator to strip the rich amine, unless I've misunderstood what you were describing. Depending on your absorber pressure, you may find more...