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[tongyan]

Hii everyone
Can anyone help me with my problem in HYSYS? I just simulated a regenerator column with acid gas cleaning MDEA amine to regenerate back the lean amine. I

 

n switching to dynamic mode, HYSYS gave this error: "a possible flipping of the liquid phases has occurred in operation main Reboiler @col2. if a spike or discontinuity has also occurred in your dynamic simulation, it is recommended to change to the user specified primary components method on the phase order tab of the relevant fluid package view"...

 

After that it gave this error "Negative pressures have been detected!"...could anyone help me with it? I don't know what the problem is?