2 replies to this topic

[harmelito]

He guys, I am a final year chemeng student at CPUT Cape Town South Africa. and my final year design project involves making hydrogen from natural gas. In the design procedure my natural gas has a CO2 content of 30% and i want to absorb it with a 15% MEA solution. Im fairly new to aspen and the built in amine program did not help. Can u pls tell me which route can i take because I am really lost and it is beginning to be really frustrating. Thanks for your help in advance. I am suppose to process 15 000 tons per day of natural gas.

PS: I will also need help in the urea process.

[Chellani]

Can you be more specific about the tool, are you using Aspen Plus or Aspen Hysys. For Aspen Plus refer to the below mentioned link and for Hysys; Amine / DBR amine package work fine (though they have some issues especially in dynamics, it shouldn't affect you).

http://www.cheresour...nit-simulation/

[Rock_Dock]

Can you be more specific about the tool, are you using Aspen Plus or Aspen Hysys. For Aspen Plus refer to the below mentioned link and for Hysys; Amine / DBR amine package work fine (though they have some issues especially in dynamics, it shouldn't affect you).

http://www.cheresour...nit-simulation/

Hey there,
i am modelling a C02 absorption process with mea in aspen dynamics and was wondering if someone can give me some advice?! I have modelled a simple absorber, but the pressure in the top stage is controlled through the manipulation of the flow rate of the off-gas. My question: Is it possible not to controll the flow rate, without the flow rate being fixed by aspen dynamics. If so, how? I have tried to fix the pressure of the off-gas and freeing the flow rate - Aspen dynamics fails to initialize (singular decomposition). Would be grateful for any help!

I am unfamiliar with Aspen Dynamics, but it sounds like the wrong simulator to use. Do you have another simulator you can use such as Hysys or ProMax? With that much CO2, I would use ProMax to model it, seeing as CO2 absorption in an amine is dependent on the residence time. I would also use aMDEA to pull out the CO2. If you use about 40w% MDEA with 3% piperazine, I think that would do the trick. Is that an option for you?

Edited by Rock_Dock, 28 May 2010 - 09:42 AM.