Method for storing tetrafluoropropene and container for storing tetrafluoropropene
To provide a method for stably storing tetrafluoropropene filled in a container for e.g. storage or transportation, without occurrence of reaction such as polymerization. A method for storing tetrafluoropropene in a gaseous-liquid state composed of a gas phase and a liquid phase in a closed container, wherein the oxygen concentration (content) in the above gas phase is adjusted to at least 3 vol ppm and less than 3,000 vol ppm at a temperature of 25° C.
1. A method for storing tetrafluoropropene, the method comprising:
sealing the tetrafluoropropene in a gaseous-liquid state composed of a gas phase and a liquid phase in a closed container,
wherein an oxygen concentration in the gas phase is at least 3 vol ppm and less than 3,000 vol ppm at a temperature of 25° C.
2. The method according to claim 1 , wherein the oxygen concentration in the gas phase is at least 5 vol ppm and less than 1,000 vol ppm at the temperature of 25° C.
3. The method according to claim 1 , wherein the tetrafluoropropene is 2,3,3,3-tetrafluoropropene.
4. The method according to claim 1 , wherein the tetrafluoropropene is selected from the group consisting of trans-1,3,3,3-tetrafluoropropene, cis-1,3,3,3-tetrafluoropropene, trans-1,2,3,3-tetrafluoropropene, cis-1,2,3,3-tetrafluoropropene, 1,3,3-tetrafluoropropene, 1,1,2,3-tetrafluoropropene, and 2,3,3,3-tetrafluoropropene.
5. The method according to claim 1 , wherein the container is a pressure-resistant container or a filling cylinder.
6. The method according to claim 1 , wherein the container is made of a carbon steel, a manganese steel, a chromium-molybdenum steel, a stainless steel, or an aluminum alloy.
7. The method according to claim 1 , the method comprising:
pressurizing the tetrafluoropropene to form a liquid, and
injecting the liquid into the closed container which is preliminarily evacuated of air.
8. The method according to claim 7 , wherein the closed container comprises non-condensable gas in a total content not exceeding 15,000 vol ppm at the temperature of 25° C.