Method for storing tetrafluoropropene and container for storing tetrafluoropropene
View Patent ↗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 in a gaseous-liquid state composed of a gas phase and a liquid phase in a closed container, the method comprising
sealing oxygen in the closed container, and
subsequently filling the tetrafluoropropene,
wherein the oxygen concentration in the gas phase is at least 3 vol ppm and less than 3,000 vol ppm at 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 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 oxygen concentration in the gas phase is at least 6 vol ppm and at most 500 vol ppm at 25° C.
5. A closed container, containing tetrafluoropropene in a gaseous-liquid state comprising a gas phase and a liquid phase,
wherein
an oxygen concentration in the gas phase is at least 3 vol ppm and less than 3,000 vol ppm at 25° C., and
a total content of non-condensable gas in the closed container is 15,000 vol ppm at 25° C.
6. The closed container according to claim 5 , wherein the oxygen concentration in the gas phase is at least 5 vol ppm and less than 1,000 vol ppm at 25° C.
7. The closed container according to claim 5 , wherein the tetrafluoropropene is 2,3,3,3-tetrafluoropropene.
8. The closed container according to claim 5 , wherein the oxygen concentration in the gas phase is at least 6 vol ppm and at most 500 vol ppm at 25° C.