Simulation of packed bed absorption/distillation in HYSYS ?

[mohamedBER]

Hello,

I would like to simulate the operations of a packedbed amine absorption unit with HYSYS ?
I have simulated a plate absorption and the results were acceptable, but now I don't know if there's a procedure to follow ? considering that Hysys uses theoritical stages with along with a correlation to estimate the murphee efficiencies for each component ?

I am wondering if the same philosophy applies in case of packed columns ? if yes, how can I estimate the equivalent height ? I wish if the guyz who faced the same problem could help clarify this point ?

Thanks a lot,

 

[gcastan]

Hey Mohamed,
which components are present in the distillation?
Do you have any more information?

Thanks

Gabriel Castaneda, PE

http://www.gabcheminc.com

Gabriel Castaneda, P.E.

http://www.gabcheminc.com

 

[chengg29]

Do you have more information to share on your query other than what you have given? You have said that your results are acceptable. Hence I assume you had used a proper calculation / simulation procedure to arrive at the results. Therefore your concern is not understood.
Nevertheless, if you click / go to the RATING tab of your COLUMN/ABSORBER unit operation windown in your HYSYS flowsheet you will see details of tray / Packed sections for you to fill up. As far as I know< HYSYS does the HETP calculations in the background. However your good ol' college Mass Transfer textbook can come to your rescue if you are interested to do the HETP calculations manually (at least the basic steps).

If you are using ASPEN HYSYS Ver. 8.6 or higher, you will have an option of using the custom built ACID GAS Package template which is "tailor made" for Acid Gas unit simulations in which the typical unit operations viz. Amine / MDEA Absorber is already in-built. Further, upon clicking on ACID GAS parameter in the PARAMETER tab of the Amine Absorber unit operation on the flowsheet you will come to a page which has details of the Tray Geometry / Packed Bed Geometry for you to fill up for HYSYS to perform an adequately rigorous simulation of the absorber (A further rigour to the simulation could be added if you set the Calculation Type as ADVANCED MODELLING to advance for the simulation to a proper rate based simulation for amine absorption).

Not sure if the above helps but I could elaborate further if you need it.