LPG mixture vapour pressure
LPG mixture vapour pressure
(OP)
It appears that the vapour pressure of propane and propylene vary considerably (ie by maybe 40psi +, propylene being higher). I have a situation with a liquid LPG burner where the supply is supposedly 95%+ propane. I am having premature vapourisation problems because I think that there may be a significant proportion of propylene in the mix. Hence to keep it a liquid prior to the nozzle exit I think I will need to raise the supply pressure considerably.
Would anyone have a graph of vapour pressure Vs temperature for propane/propylene mixtures?
Thanks in advance.
Would anyone have a graph of vapour pressure Vs temperature for propane/propylene mixtures?
Thanks in advance.
Rod Nissen.
Combustion & Engineering Diagnostics





RE: LPG mixture vapour pressure
Good luck,
Latexman
RE: LPG mixture vapour pressure
Here's a blog I did a while back on this issue, although it's for the much more demanding application of grilling beef:
http://www.kele.com/templates/blog.aspx?id=5336&am...
Good on ya,
Goober Dave
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RE: LPG mixture vapour pressure
There is plenty of info and graphs on propane butane mixtures, whose individual vapour pressures vary considerably. We have issues here in Australia where commercial propane may contain up to 60% propylene. This has caused problems with how the gas burns in vapour burners (ie soot formation). Now it loks like it could have a bearing on liquid LPG burners. I was just hoping there may have been a similar graph to the propane/butane mix already.
If not will try your recommendations.
Rod Nissen.
Combustion & Engineering Diagnostics
RE: LPG mixture vapour pressure
there are VLE charts but I prefer to use a software (in my case Prode Properties with Excel), a EOS as SRK or PR should give accurate estimates.
RE: LPG mixture vapour pressure
Up to 60% propylene in commercial propane? Wow, that really surprises me. Yes, I would expect sooting in a burner designed for propane. You need an adjustable air mixture on the burner.
RE: LPG mixture vapour pressure
I agree with compositepro about the percentage of propylene...
RE: LPG mixture vapour pressure
Rod Nissen.
Combustion & Engineering Diagnostics
RE: LPG mixture vapour pressure
RE: LPG mixture vapour pressure
Rod Nissen.
Combustion & Engineering Diagnostics
RE: LPG mixture vapour pressure
The 'apparent icing' may actually be "LPG hydrate formation" generally looking similar to ice;
if the point local conditions favor this physical bondage of moisture with LPG!
Hopefully this also indicates another possibility of ice like appearance 'in near vicinity of' or 'around' burner tips.
Best Regards
Qalander(Chem)
RE: LPG mixture vapour pressure
RE: LPG mixture vapour pressure
Your inference seems reasonable to me as, in all fairness
'propylene' should be costlier than 'straight run LPG' mixtures commonly available/marketed!
Best Regards
Qalander(Chem)