2 replies to this topic

[Verdurer]

Dear ladies and gentilemen,

Hi.I am an chemical enginnering student and I recently met some problems in my project of Amine scrubbing. As I am sizing the regenerator,which is assumed to be a distillation column in Aspen hysys, I should start by using some shortcut method such as mccabe thiele. And the xy-plot for CO2 and MEA seems like a mess. Thus, I stopped at the first step of internal sizing. I wonder what should I do to estimate the applicable VLE data.

Thank you

[Pilesar]

McCabe Thiele shortcut method is not appropriate for modeling CO2 removal using MEA as you found out. You should use a rigorous distillation model. There is an acid-base reaction taking place. Hysys should have a thermodynamic method specially for amines -- probably using the Kent Eisenberg approach to account for the reactions. For a primary amine such as MEA, this method gives good results. You model the regenerator in a rigorous column using the special amine package. The regenerator does not need many stages-- perhaps seven theoretical stages total. If you use too many stages, convergence can be more elusive. You will want a partial condenser. Do not concern yourself with sizing internals until after you get an accurate converged model.

[breizh]

Hi,

You may find pointers in the links attached.

https://www.aidic.it/cet/13/32/309.pdf

https://www.ijcce.ac...7001f296984.pdf

More info using your favorite search engine

key words: Kent Eisenberg CO2 MEA model

Breizh