3 replies to this topic

[shahad]

I want to do a flash calculation on a reflux drum with a known temperature and pressure, so first I need to calculate the svp using antoine coefficients to then get the K values. 

 

My issue is that I have hydrogen, h2s, methane, ethane and propane, and the antoine coefficents are out of the temperature range, so is there another way to calculate the K values?

 

Also, I have a range of pseudo components (NBP54-154) so can I assume it is hexane/pentane?

[breizh]

Hi,

You may consider the calculator attached to support your work together with an excel sheet used to calculate a flash based on EOS (Peng Robinson) . You will find a way to get access to Ki's in the document.

 

On top of that you may consider this web application offered by Quest :

Other Thermodynamic Properties – Quest Consultants

Good luck,

Breizh

[latexman]

Here is an ancient resource - https://en.wikipedia...ePriester_chart

 

It may not have all your components, but I wanted to point it out.  I suspect with Hydrogen you may have to utilize some Henry's Law data/method.

[SilverShaded]

For accurate results you really need to use a simualtor as there will be significant intreactions between those compounds.  The Heavier hydrocabons will for example sponge the lighter compounds to some extent so using pure component vapour pressure won't be very accurate and could lead to significant error.

Edited by SilverShaded, 14 April 2021 - 02:12 AM.