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[SHAH RUKH KAMIL]

I am trying to do the simulations in Aspen Plus at high pressure (gas absorption and stripping case). The absorption is going on normally. However, the results of stripping or desorption are quite uncertain.

 

For example:

Case 1: The reboiler duty is 0.4 MW, it will converge and give the normal results.

Case 2: The reboiler duty is 0.41 MW, it will not converge, or converge with errors and totally different results.

Case 3: The reboiler duty is 0.39 MW, it will not converge, or converge with errors and totally different results..

 

This is very uncertain. A slight change in reboiler duty totally results in the deviation from normal results. What can be the reason for that. Need opinions/suggestions. Thanks!