Hydrocarbon Dew Point
Hydrocarbon Dew Point
(OP)
Does anyone know how to calculate (simply) the dew point of a natural gas mixture given its composition?
There was a very informative thread798-142881: Hydrocarbon dewpoint (HDP) now closed about cricondentherm etc.
I seem to have a basic misunderstanding which is:
Our client states a cricondentherm temp of 4-10degC for a gas mixture (at 65Barg). However the gas is composed of about 5% Propane and C3+. I have checked vapour pressure charts and see that Propane is liquid at 12Bar (30degC) and Butane at about 3 Bar (30 degC).
I don't understand why these fractions don't 'drop out' of the gas as these pressures are reached. Our client insists that temp needd to drop to below the Cricondentherm temp before any liquifaction. Do the components behave differently when in a mixture? Or am I oversimplifying my understanding of vapour pressure charts?
Help please.
There was a very informative thread798-142881: Hydrocarbon dewpoint (HDP) now closed about cricondentherm etc.
I seem to have a basic misunderstanding which is:
Our client states a cricondentherm temp of 4-10degC for a gas mixture (at 65Barg). However the gas is composed of about 5% Propane and C3+. I have checked vapour pressure charts and see that Propane is liquid at 12Bar (30degC) and Butane at about 3 Bar (30 degC).
I don't understand why these fractions don't 'drop out' of the gas as these pressures are reached. Our client insists that temp needd to drop to below the Cricondentherm temp before any liquifaction. Do the components behave differently when in a mixture? Or am I oversimplifying my understanding of vapour pressure charts?
Help please.





RE: Hydrocarbon Dew Point
Non-polar hydrocarbons in mixtures show these critical properties.
You could see some P-T diagrams at the end of
http://w
and some explanation in:
htt
RE: Hydrocarbon Dew Point
A lot of thoughs have then gone into trying to determine exactly how much
Best regards
Morten
RE: Hydrocarbon Dew Point
The biggest problem is not with the equation and solving it (a similator program like WinSim, Hysys, and Prosim will do this in 100 nano seconds), its defining exactly what all the componets are down to the C10's.
Search around www.gasprocessors.com for papers written over the last three years on this topic.