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EP-4227380-B1 - COMPOSITION CONTAINING REFRIGERANT, AND METHOD FOR STABILIZING COMPOSITION CONTAINING REFRIGERANT

EP4227380B1EP 4227380 B1EP4227380 B1EP 4227380B1EP-4227380-B1

Inventors

  • GOTOU, Tomoyuki
  • YOSHIMURA, TAKASHI
  • USUI, TAKASHI
  • ITO, Yuuko
  • WATANABE, YUKA

Dates

Publication Date
20260513
Application Date
20211007

Claims (8)

  1. A composition comprising - a refrigerant comprising at least one compound selected from trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), 1,1-difluoroethylene (HFO-1132a), trifluoroethylene (HFO-1123) and tetrafluoroethylene (FO-1114), and - carbon particles which is at least one selected from carbon fibers, carbon nanotubes, graphene, graphite, and amorphous carbon.
  2. The composition of claim 1, which comprises ≥ 1 ppm by we weight of the carbon particles, based on the refrigerant.
  3. The composition of claim 1 or 2, further comprising 10-100 ppm by weight of water.
  4. The composition of any of claims 1-3, which further comprises a refrigeration oil.
  5. The use of the composition of claim 4 as a refrigeration oil-containing working fluid.
  6. A method for stabilizing a composition comprising a refrigerant comprising at least one compound selected from trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), 1,1-difluoroethylene (HFO-1132a), trifluoroethylene (HFO-1123) and tetrafluoroethylene (FO-1114), comprising incorporating, into the composition, carbon particles which is at least one selected from carbon fibers, carbon nanotubes, graphene, graphite, and amorphous carbon.
  7. The method of claim 6, wherein ≥ 1 ppm by weight of the carbon particles is incorporated, based on the refrigerant.
  8. The method of claim 6 or 7, further comprising incorporating 10-100 ppm by weight of water into the composition.

Description

Technical Field The present disclosure relates to a composition comprising a refrigerant and a method for stabilizing a composition comprising a refrigerant. Background Art JP-A-2011-220594 discloses a refrigeration cycle comprising an electric compressor, a condenser, an expansion valve, and an evaporator, as well as a circulation path that communicates with these components, wherein, in the refrigeration cycle, a refrigerant, such as 2,3,3,3-tetrafluoropropene (HFO-1234yf), and a lubricating oil are circulated in the circulation path, wherein the circulation path comprises an acid-neutralizing adsorber provided with a neutralizer that neutralizes an acid generated in the circulation path and an adsorbent that adsorbs moisture, and wherein the adsorbent for use is zeolite, activated carbon, alumina, or silica gel. Summary of Invention Technical Problem An object of the present disclosure is to provide a composition having excellent stability of a refrigerant. Solution to Problem The present invention provides a composition comprising a refrigerant comprising at least one compound selected from trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), 1,1-difluoroethylene (HFO-1132a), trifluoroethylene (HFO-1123) and tetrafluoroethylene (FO-1114), andcarbon particles which is at least one selected from carbon fibers, carbon nanotubes, graphene, graphite, and amorphous carbon. Also, the present invention provides the use of the above composition as a refrigeration oil-containing working fluid. Yet further, the present invention provides a method for stabilizing a composition comprising a refrigerant comprising at least one compound selected from trans-1,2-difluoroethylene (HFO-1132(E)), cis-1,2-difluoroethylene (HFO-1132(Z)), 1,1-difluoroethylene (HFO-1132a), trifluoroethylene (HFO-1123) and tetrafluoroethylene (FO-1114), comprising incorporating, into the composition, carbon particles which is at least one selected from carbon fibers, carbon nanotubes, graphene, graphite, and amorphous carbon. Preferred embodiments of the invention are as defined in the appended dependent claims and/or in the following detailed description. Advantageous Effects of Invention The composition according to the present disclosure has excellent stability of a refrigerant. Description of Embodiments The present inventors conducted extensive research to improve the stability of a refrigerant, and found that the object can be achieved when at least one component selected from HFO-1132 (E/Z), HFO-1132a, HFO-1123, and FO-1114 as a refrigerant is present together with carbon particles which is at least one selected from carbon fibers, carbon nanotubes, graphene, graphite, and amorphous carbon. The inventors found that the stability of a refrigerant is further improved by allowing carbon to be present together when a composition contains water. Below, embodiments encompassed by the present disclosure will be described in detail. Definition of Terms Herein, the term "refrigerant" includes at least compounds that are specified in ISO 817 (International Organization for Standardization), and that are given a refrigerant number (ASHRAE number) representing the type of refrigerant with "R" at the beginning; and further includes refrigerants that have properties equivalent to those of such refrigerants, even though a refrigerant number is not yet given. Refrigerants are broadly divided into fluorocarbon compounds and non-fluorocarbon compounds in terms of the structure of the compounds. Fluorocarbon compounds include hydrochlorofluorocarbons (HCFC) and hydrofluorocarbons (HFC). Examples of non-fluorocarbon compounds include propane (R290), propylene (R1270), butane (R600), and isobutane (R600a). Herein, the phrase "composition comprising a refrigerant" at least includes (1) a refrigerant itself (including a mixture of refrigerants (refrigerant mixtures)), (2) a composition that further comprises other components and that can be mixed with at least a refrigeration oil to obtain a working fluid for a refrigerating machine, and (3) a working fluid for a refrigerating machine containing a refrigeration oil (refrigeration working fluid). Of these three embodiments, the composition (2) is referred to herein as a "refrigerant composition" so as to distinguish it from a refrigerant itself (including a mixture of refrigerants). Further, the working fluid for a refrigerating machine (3) is referred to herein as a "refrigeration oil-containing working fluid" (working fluid containing refrigeration oil) so as to distinguish it from the "refrigerant composition." Herein, when the term "alternative" is used in a context in which the first refrigerant is replaced with the second refrigerant, the first type of "alternative" means that equipment designed for operation using the first refrigerant can be operated using the second refrigerant under optimum conditions, optionally with changes of only a few parts (at least one of the follow