Method for storing tetrafluoropropene and container for storing tetrafluoropropene

Patent metadata

Field	Value
Publication number	US-10759725-B2
Application number	US-201916562483-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Apr 27, 2012
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

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.

First claim

What is claimed is:

1. A method for storing tetrafluoropropene, the method comprising
storing the tetrafluoropropene in a gaseous-liquid state comprising a gas phase and a liquid phase in a closed container,
wherein
the gas phase has an oxygen concentration ranging from 3 vol ppm to less than 3,000 vol ppm at 25° C. and a total content of non-condensable gas of 15,000 vol ppm or less at 25° C.

2. The method according to claim 1 , wherein the oxygen concentration in the gas phase is adjusted to 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. A closed container for storing tetrafluoropropene in a gaseous-liquid state of comprising a gas phase and a liquid phase, wherein
the gas phase has an oxygen concentration ranging from 3 vol ppm to less than 3,000 vol ppm at 25° C. and a total content of non-condensable gas of 15,000 vol ppm or less at 25° C., and
the closed container is made of at least one material selected from the group consisting of a carbon steel, a manganese steel, a chromium-molybdenum steel, a stainless steel, and an aluminum alloy.

5. The closed container according to claim 4 , wherein the oxygen concentration in the gas phase is at least 5 vol ppm and less than 1,000 vol ppm at 25° C.

6. The closed container according to claim 4 , wherein the tetrafluoropropene is 2,3,3,3-tetrafluoropropene.

Assignees

• Agc Inc

Inventors

• Fukushima Masato
• Tsuzaki Masaaki
• Shigematsu Maki

Classifications

• C07C17/38 Primary

  Separation; Purification; Stabilisation; Use of additives · CPC title

• F17C5/00

  Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures (adding propellants to aerosol containers B65B31/00) · CPC title

• F17C1/00

  Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge (pressurised apparatus for purposes other than storage, see the relevant subclasses such as A62C, B05B; associated with vehicles, see the appropriate subclass of classes B60 - B64; pressure vessels in general F16J12/00 {; autoclaves B01J3/04; tank vehicles B60P3/22; railway tank wagons for carrying fluent materials B61D5/00; accumulators for supplying fluid under pressure F15B1/04; liquefied gas stoves F24C3/00}) · CPC title

• F17C2203/0643

  Stainless steels · CPC title

• C07C21/18 Primary

  containing fluorine · CPC title