The ratio of propane to butane in a half-empty LPG cylinder changes as the gases are consumed. Initially mixed at 50% propane and 50% butane, the propane, having a higher vapor pressure, is utilized faster than butane. As a result, the remaining liquid in the cylinder becomes richer in butane. The vapor released will be an intimate mixture of both gases, with proportions approximated by Raoult's Law.
PREREQUISITESChemical engineers, gas industry professionals, and anyone involved in the handling or utilization of LPG mixtures.
The outtake of gas will be in gas-phase (Vapor)Bystander said:"Yes."
You will have to be more specific about conditions.
The outtake of gas will be in gas-phase (Vapor)Averagesupernova said:It depends on whether you are just using vapor off the top of the tank or taking liquid.
So, the gasses keep their own properties and will not be a combination of the two?Chestermiller said:The Propane has a higher vapor pressure than the Butane, so the propane will be used faster, and the liquid will become richer in butane.
The exit vapor will be an intimate mixture of butane and propane in proportions described approximately by Raolt's Law.Saint1968 said:So, the gasses keep their own properties and will not be a combination of the two?