×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Gas Solubility calculations with Aspen Plus

Gas Solubility calculations with Aspen Plus

Gas Solubility calculations with Aspen Plus

(OP)
I am running a simulation with Aspen Plus to study gas solubility in  alcohols, the gas feed is compose by H2 O2 N2, the operation conditions are P= 90-150 bar (high pressure) and low temperatures (30-70 ÂșC). I would like to know what property method of those available in Aspen could calculate the gas solubility in alcohol more accurate, because I have tried with several of then (PRWS, RKSMHV2, RKSWS, PSRK, RKSMHV2) and there are big  differences between then.

Thanks

RE: Gas Solubility calculations with Aspen Plus

I don't think you will get precise results with generalized correlations. you need correlations built on specific lab data .



RE: Gas Solubility calculations with Aspen Plus

at least you should choose the property method by evaluating against lab results. take the one with the best fit to real data.
thats more or less all advice i'm able to offer...

RE: Gas Solubility calculations with Aspen Plus

Unless you can get a response from someone who has specific experience with your system, you may want to try Aspen technical support center.  
http://support.aspentech.com/SupportPublic/AllFrameDef.html

Your key info may be the Henry's Law data for your system.  I'm not sure if that would vary between the thermodynamic methods you mentioned but how the different methods use that data could vary.

As previously mentioned, it would be a good idea to validate your simulations against either lab data or actual operating data.

RE: Gas Solubility calculations with Aspen Plus

You need to invoke the Henry's law package in the Apsen screen where you choose the overall Thermopackage.  From there it will prompt you to review the Henry's law constants.

Can you provide some details about what you are trying to model?  I modelled the degassing of hydrogen from alcohol in atmospheric storage tanks for my previous employer and found that hydrogen will accumulate and form an flammable mixture.  Also I know of a plant in Italy a few years ago that had an explosion and fatality because of degassing in the storage tank.

RE: Gas Solubility calculations with Aspen Plus

As per previous guidence you should use an activity coef method (ideal or other) and henry's- none of these EOS methods can be trusted for your system (esp if no RKS-ij params are being used). If you have solubility at 2 temps, regress henry-1/2 yourself. Use the available databank henry's data for lower MW alcohols (butanol, etc) as a reality check for your data. What alcohols?- May have some data applicable for your system.

pmureiko, write me: sean.shepherd@sasol.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources