Compositions comprising 1,1-difluoroethene, trifluoromethane and a third component

Patent metadata

Field	Value
Publication number	US-11084962-B2
Application number	US-201615545420-A
Country	US
Kind code	B2
Filing date	Feb 1, 2016
Priority date	Jan 30, 2015
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

The present invention provides a composition, such as a refrigerant composition comprising 1, 1-difluoroethene (vinylidene fluoride, R-1132a); trifluoromethane (R-23); and one or more compound selected from hexafluoroethane (R-116), ethane (R-170) and carbon dioxide (R-744, CO2).

First claim

The invention claimed is:

1. A refrigeration system comprising a composition, the composition consisting of:
i) 1,1-difluoroethene (vinylidene fluoride, R-1132a);
ii) about 20% to about 60% by weight trifluoromethane (R-23); and
iii) about 4% to about 8% by weight carbon dioxide (R-744, CO 2 ) excluding compositions that additionally comprise hexafluoroethane (R-116);
wherein the refrigeration system cools a compartment to less than −70° C.

2. A refrigeration system according to claim 1 , wherein the composition has a temperature glide in an evaporator or condenser of less than 10 K.

3. A refrigeration system according to claim 1 , wherein the composition has a critical temperature of greater than 0° C.

4. A refrigeration system according to claim 1 , wherein the composition has a volumetric refrigeration capacity of at least 90% of that of R-508 at comparable cycle conditions and a compressor discharge temperature within 15 K of that of R-508 at comparable cycle conditions.

5. A refrigeration system according to claim 1 , further comprising a lubricant wherein the lubricant is selected from: mineral oil, silicone oil, polyalkyl benzenes (PABs), polyol esters (POEs), polyalkylene glycols (PAGs), polyalkylene glycol esters (PAG esters), polyvinyl ethers (PVEs), poly (alpha-olefins) and combinations thereof.

6. A refrigeration system according to claim 1 , further comprising a stabiliser wherein the stabiliser is selected from: diene-based compounds, phosphates, phenol compounds, epoxides, and mixtures thereof.

7. A refrigeration system according to claim 1 , further comprising a flame retardant, wherein the flame retardant is selected from: the group consisting of tri-(2-chloroethyl)-phosphate, (chloropropyl) phosphate, tri-(2,3-dibromopropyl)-phosphate, tri-(1,3-dichloropropyl)-phosphate, diammonium phosphate, various halogenated aromatic compounds, antimony oxide, aluminium trihydrate, polyvinyl chloride, a fluorinated iodocarbon, a fluorinated bromocarbon, trifluoro iodomethane, perfluoroalkyl amines, bromo-fluoroalkyl amines, and mixtures thereof.

8. A heat transfer device containing a composition, the composition consisting of:
i) 1,1-difluoroethene (vinylidene fluoride, R-1132a);
ii) about 20% to about 60% by weight trifluoromethane (R-23); and
iii) about 4% to about 8% by weight carbon dioxide (R-744, CO 2 ) excluding compositions that additionally comprise hexafluoroethane (R-116);
wherein the heat transfer device cools a compartment to less than −70° C.

9. A heat transfer device according to claim 1 wherein the heat transfer device is a refrigeration device selected from an ultra-low temperature refrigeration system and a cascade system.

10. A method for reducing the environmental impact arising from the operation of a product comprising an existing compound or composition, the method comprising replacing at least partially the existing compound or composition with a composition according to claim 1 .

11. A method according to claim 10 wherein the product is selected from a heat transfer device, a sprayable composition, a solvent or a mechanical power generation device.

12. A method according to claim 11 wherein the product is an ultra-low temperature refrigeration system, optionally wherein the existing compound or composition is selected from R-508A, R-508B, R-23 and R-1361.

13. A method for generating greenhouse gas emission credit comprising (i) replacing an existing compound or composition with a composition as defined in claim 1 , wherein the composition according to claim 1 has a lower GWP than the existing compound or composition; and (ii) obtaining greenhouse gas emission credit for said replacing step.

14. A method of claim 13 wherein the use of the composition of the invention results in a lower Total Equivalent Warming Impact, and/or a lower Life-Cycle Carbon Production than is attained by use of the existing compound or composition, optionally wherein the method is carried out on a product from the fields of air-conditioning, refrigeration, heat transfer, aerosols or sprayable propellants, gaseous dielectrics, flame suppression, solvents, cleaners, topical anesthetics, or expansion applications.

Assignees

• Mexichem Fluor Sa De Cv

Inventors

• Low Robert E
• Sharratt Andrew

Classifications

• C09K2205/128

  Perfluorinated hydrocarbons (C09K2205/124, C09K2205/126 take precedence) · CPC title

• C11D7/505

  Mixtures of (hydro)fluorocarbons · CPC title

• C09K5/045 Primary

  containing only fluorine as halogen · CPC title

• F01K23/08

  with working fluid of one cycle heating the fluid in another cycle · CPC title

• C09K3/30

  for aerosols (aerosol containers B65D83/14) · CPC title