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US-12623984-B2 - Azeotropic or azeotrope-like composition containing trifluoroethylene

US12623984B2US 12623984 B2US12623984 B2US 12623984B2US-12623984-B2

Abstract

Provided are a novel azeotropic or azeotrope-like composition, and a separation method using the composition. An object is to provide a novel azeotropic or azeotrope-like composition, and a separation method using the composition. A solution to achieve the object is to provide an azeotropic or azeotrope-like composition containing trifluoroethylene and at least one compound selected from the group consisting of 1,1-difluoroethylene, fluoroethylene, and trifluoromethane.

Inventors

  • Kazuhiro Takahashi

Assignees

  • DAIKIN INDUSTRIES, LTD.

Dates

Publication Date
20260512
Application Date
20210927
Priority Date
20190328

Claims (4)

  1. 1 . An azeotropic or azeotrope-like composition consisting of (a) trifluoroethylene, (b) at least one compound selected from the group consisting of fluoroethylene and trifluoromethane, and (c) at least one additional compound selected from the group consisting of fluoroethane, 2-chloro-1,1,1-trifluoroethane, 2,2-dichloro-1,1,1-trifluoroethane, and 1,2-difluoroethane, wherein the additional compound (c) is contained in an amount of 0.1 mass % or more and less than 1 mass % based on the entire azeotropic or azeotrope-like composition.
  2. 2 . The azeotropic or azeotrope-like composition according to claim 1 , wherein the trifluoroethylene in present in an amount of 50 mass % or more based on the entire azeotropic or azeotrope-like composition.
  3. 3 . The azeotropic or azeotrope-like composition according to claim 1 , which is for use as a heat transfer medium.
  4. 4 . The azeotropic or azeotrope-like composition according to claim 2 , which is for use as a heat transfer medium.

Description

TECHNICAL FIELD The present disclosure relates to an azeotropic or azeotrope-like composition containing trifluoroethylene (“HFO-1123” below). BACKGROUND ART A refrigerant is proposed that contains trifluoroethylene (CHF═CF2) as HFO (hydrofluoroolefin), which is HFC of an olefin with low global warming potential (PTL 1). Trifluoroethylene can be produced by, for example, subjecting 1,1,1,2-tetrafluoroethane to an HF elimination reaction in the presence of a catalyst (PTL 2). Trifluoroethylene can also be produced by reducing 1-chloro-2,2,2-trifluoroethylene with hydrogen (PTL 3). CITATION LIST Patent Literature PTL 1: WO2012/157764APTL 2: WO2009/010472APTL 3: WO2012/000853A SUMMARY Item 1. An azeotropic or azeotrope-like composition comprising trifluoroethylene (HFO-1123) and at least one compound selected from the group consisting of 1,1-difluoroethylene (HFO-1132a), fluoroethylene (HFO-1141), and trifluoromethane (HFC-23). Advantageous Effects The present disclosure provides a novel azeotropic or azeotrope-like composition, and a separation method using the azeotropic or azeotrope-like composition. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows an example of the process of separation by distillation using an azeotropic or azeotrope-like composition. DESCRIPTION OF EMBODIMENTS Definition of Terms In the present specification, 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 chlorofluorocarbons (CFC), hydrochlorofluorocarbons (HCFC), and hydrofluorocarbons (HFC). Non-fluorocarbon compounds include propane (R290), propylene (R1270), butane (R600), isobutane (R600a), carbon dioxide (R744), ammonia (R717), and the like. In the present specification, the phrase “composition comprising a refrigerant” at least includes (1) a refrigerant itself (including a mixture of refrigerants); (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. In the present specification, of these three embodiments, the composition (2) is referred to 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 as a “refrigeration oil-containing working fluid” so as to distinguish it from the “refrigerant composition.” In the present specification, the term “azeotrope-like composition” refers to a composition that can be handled in substantially the same manner as azeotropic compositions. Specifically, in the present specification, the term “azeotrope-like composition” means a mixture composed of two or more substances that behave substantially as a single substance with a constant boiling point, or substantially a constant boiling point. A feature of an azeotrope-like composition is that vapor generated by evaporating or distilling the composition in liquid form has a formulation substantially unchanged from the formulation of the liquid. Specifically, in the present specification, a mixture that can be boiled, distilled, or refluxed without a substantial compositional change is referred to as an “azeotrope-like composition.” Specifically, a composition having a difference between the bubble-point pressure and the dew-point pressure of 3 percent or less (based on the bubble-point pressure) at a specific temperature is defined as an azeotrope-like composition in the present disclosure. In the present specification, 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 following: refrigeration oil, gasket, packing, expansion valve, dryer, and other parts) and equipment adjustment. In other words, this type of alternative means that the same equipment is operated with an alternative refrigerant. Embodiments of this type of “alternative” include “drop-in alternative,” “nearly drop-in alternative,” and “retrofit,” in the order in which the extent of changes and adjustment necessary for replacing the first refrigerant with the second refrigerant is smaller. The term “alternative” also includes a second type of “