6 replies to this topic

[saxn]

Hi all,

I am new to this forum but have visited it many times. I would like to know if any one of you have successfully simulated a selexol stripper in Aspen hysys. The problem I have faced is that the converged solution that I get is not correct.
Selexol is proprietary physical solvent used for acid gas treating and is modeled as DEPG. But it seems that the DBR amine package that is used for the thermo package does not properly define the thermal properties of DEPG.
If any one of you can provide me any clues, please let me know

Thanks,

Atul

[Technical Bard]

The DBR Amine package is for amines, which are chemical solvents. DEPG is a physical solvent. Aspen does not have data on the VLE properties of DEPG in any of their property packages. VMGSim and ProMax have DEPG VLE paramaters. UOP/Dow and Clariant have their own models. Without a bunch of VLE data and a regression effort, you won't be able to model Selexol in HYSYS.

[mattb]

you should be able to do VLE with Peng-Robinson,
Selexol has been in use for many years now,
see this paper
www.winsim.com/news/feb1982.pdf

[Technical Bard]

Peng-Robinson could do the VLE if you have interaction parameters for Selexol and the other species in your simulator. As I mentioned before, this data is proprietary. A standard off the shelf simulator (e.g. Aspen Plus, Unisim, etc) won't have that data.

That ChemShare paper indicates that access to their Selexol model (in 1982) required the approval of the intellectual property owner, Allied Chemical (now part of Dow Chemical).

Edited by Technical Bard, 13 November 2012 - 01:00 AM.

[Padmakar Katre]

Hi,
For physical solvents, use rate bases simulation models. I will recommend Pro-Treat. You can use Aspen Plus with rate based.

[RockDock]

I've modeled many Selexol units with ProMax (a rate-based simulator), so a standard off the shelf simulator CAN model it. You just want to be sure to use a Polar Property Package (most simulators don't have one).

Attached is a standard model of a Selexol unit in .pdf format.

As you can see, it does a good job of removing sour gasses and is a viable option for gas treating.

Attached Files

•  Acid Gas Removal with DEPG.pdf   179.63KB   239 downloads

Edited by RockDock, 11 January 2013 - 03:39 PM.

[mskashed]

hi dears

I am working on simulation of selexol and purisol processes with hysys.

the problem is that, I need industrial data for the accuracy of the results.

I would like to ask  if anyone have the data of the industrial acid gas removal unit working with selexol or purisol process.

if no hysys file is available, others such as promax can be useful, too

 

 

thanks indeed