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How to Compress Propane Vapor to Liquid

Propane is a colorless, odorless gas that is typically used in its vapor form. The reason for this is that propane has a very low boiling temperature of -45 degrees. If propane is compressed, however, the boiling point can be raised. To compress propane from a vapor to a liquid, the storage container must either be brought below -45 degrees or stored at a higher pressure. Unless the propane is poured into a container at the same pressure or temperature, however, it will revert back to a liquid when leaving the pressurized or chilled container.

Propane canister

Instructions

- 1
  Bring the propane canister into a walk-in freezer that is set to a constant temperature lower than -45 degrees. This is below the boiling point of propane so it will compress into a liquid naturally. The canister can be opened and the liquid propane poured out into an open container.
- 2
  Increase the pressure of the canister. Check that the one you are using can handle high pressures, then fill it with propane until the PSI reaches 257. At this temperature, the tank would have to reach 130 degrees before the propane inside boiled.
- 3
  Increase the pressure of the tank according to the temperature outside. If your propane is stored in an area with reliable constant temperature, such as a shady area that never reaches 100 degrees, you could store the propane at 172 PSI. It would always remain in a compressed liquid state (see the "References" section to find temperatures needed for propane to boil at when stored at different pressures).

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