COMPOSITIONS

Abstract

A composition comprising: (i) 1,1-difluoroethene (vinylidene fluoride, R-1132a); (ii) carbon dioxide (CO.sub.2, R-744); (iii) pentafluoroethane (R-125); and (iv) one or more of trifluoromethane (R-23) and hexafluoroethane (R-116).

Claims

1. A composition comprising: (i) 1,1-difluoroethene (vinylidene fluoride, R-1132a); (ii) carbon dioxide (CO.sub.2, R-744); (iii) from about 5 to 25% by weight pentafluoroethane (R-125); and (iv) trifluoromethane (R-23).

2. The composition according to claim 1 comprising from 1 to 90% by weight R-1132a.

3. The composition according to claim 1 comprising from 1 to 90% by weight carbon dioxide.

4. The composition according to claim 1 comprising from 1 to 90% of trifluoromethane.

5. The composition according to claim 1 comprising from 20 to 40% by weight R-1132a, from 30 to 60% by weight carbon dioxide, and from 1 to 20% by weight R-23.

6. The composition according to claim 1, wherein the R-1132 is present in an amount of less than 50% by mol.

7. The composition according to claim 1 consisting essentially of: (i) 1,1-difluoroethene (vinylidene fluoride, R-1132a); (ii) carbon dioxide (CO.sub.2, R-744); (iii) from about 5 to 25% by weight pentafluoroethane (R-125); and (iv) trifluoromethane (R-23).

8. The composition according to claim 1 which is azeotropic or near-azeotropic.

9. The composition according to claim 1, wherein the composition (i) is less flammable; (ii) has a higher flammable limit; (iii) has a higher ignition energy; and/or (iv) has a lower flame velocity compared to R-1132 alone.

10. The composition according to claim 1 which is non-flammable.

11. The composition according to claim 1 which has a temperature glide in an evaporator or condenser of less than about 10 K.

12. The composition according to claim 1 which has a critical temperature of greater than about 0° C.

13. The composition according to claim 1 whose volumetric refrigeration capacity is at least 90% of that of R-23 at comparable cycle conditions.

14. The composition according to claim 1 whose cycle efficiency (Coefficient of Performance, COP) is at least 95% and/or within about 5% of the existing refrigerant fluid that the composition is replacing.

15. The composition according to claim 1 whose compressor discharge temperature is within 15 K of that of R-23 at comparable cycle conditions.

16. A composition comprising a lubricant, a stabilizer, and/or a flame retardant and the composition according to claim 1.

17. The composition according to claim 16, wherein the lubricant is selected from the group consisting of 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; wherein the stabilizer is selected from the group consisting of diene-based compounds, phosphates, phenol compounds, epoxides, and mixtures thereof; and 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-chloropropyl)-phosphate, diammonium phosphate, various halogenated aromatic compounds, antimony oxide, aluminum trihydrate, polyvinyl chloride, a fluorinated iodocarbon, a fluorinated bromocarbon, trifluoroiodomethane, perfluoroalkyl amines, bromo-fluoroalkyl amines, and mixtures thereof.

18. The composition according to claim 17, wherein the composition comprises a lubricant and pentane.

19. A heat transfer device comprising the composition according to claim 1.

20. The heat transfer device according to claim 19, wherein the heat transfer device is a refrigeration device.

21. The heat transfer device according to claim 19, wherein the heat transfer device comprises an ultra-low temperature refrigeration system and/or a cascade system.

22. A method for cooling an article which comprises condensing the composition according to claim 1 and thereafter evaporating the composition in the vicinity of the article to be cooled.

23. A method for heating an article which comprises condensing the composition according to claim 1 in the vicinity of the article to be heated and thereafter evaporating the composition.

24. A method of retrofitting a heat transfer device comprising removing an existing heat transfer composition, and introducing the composition according to claim 1.

25. The method according to claim 24, wherein the heat transfer device is a refrigeration device.

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

27. The composition according to claim 1 further comprising hexafluoroethane (R-116).

28. The method according to claim 25, wherein the existing heat transfer composition is a refrigerant selected from the group consisting of R-508A, R-508B, R-23, and R-1361.

29. The method according to claim 26, wherein the existing compound or composition is a refrigerant selected from the group consisting of R-508A, R-508B, R-23, and R-1361.

Description

EXAMPLES

Compositions of R-1132a, R-744, R-125 and R-23

[0105] The performance of quaternary compositions of the invention were modelled and the results are provided in the following Tables. The tables list the GWP, condenser and evaporator glide, capacity and COP relative to R-23, the difference in discharge temperature and condenser pressure, The Tables provide the contents as weight percentages, unless otherwise specified.

[0106] The cycle conditions used in the modelling are as Table 1.

TABLE-US-00001 Cycle conditions for modelling Reference fluid for cycle calculation is R-23 Condensing temperature ° C. −20 Evaporating temperature ° C. −70 Suction gas temperature ° C. −50 Isentropic efficiency 0.65 Subcooling K 5 Evaporator superheat K 5 Cooling duty kW 1 Clearance ratio 0.03 Suction line diameter for PD calculation mm 22 Cycle calculation results R-23 reference Pressure ratio 7.20 Volumetric efficiency 89.3% Condenser glide K 0.0 Evaporator glide K 0.0 Evaporator inlet temperature ° C. −70.0 Condenser exit temperature ° C. −25.0 Condenser pressure bar 13.95 Evaporator pressure bar 1.94 Refrigeration effect kJ/kg 174.1 Coefficient of Performance 1.90 Discharge temperature ° C. 86.4 Mass flow rate kg/hr 20.7 Volumetric flow rate m3/hr 2.72 Volumetric capacity kJ/m3 1322 Suction line pressure drop kPa/m 8.75 Suction line density kg/m3 7.59 Condenser inlet density kg/m3 58.94 Capacity relative to R-23 100.0% COP relative to R-23 100.0% Discharge temperature difference K 0.0 Condenser pressure difference bar 0.00 Pressure ratio relative to that of R-23 100.0%

[0107] The thermodynamic model used for the mixture calculations uses a cubic equation of state to model the vapour phase, with a Gibbs free energy correlation (the Wilson equation) to model the liquid phase and temperature correlations of the component vapour pressures. The binary interaction parameters for the fluids were correlated to measured phase equilibrium data where available.

[0108] Many compositions have been identified that have volumetric capacity significantly higher than that of R-23 and may be better suited to a new system design to take advantage of the fluid properties.

TABLE-US-00002 TABLE 2 R744 60 R1132a 30 R-23 5 R125 5 Global Warming Potential (AR4 basis) 916 Cycle calculation results Condenser glide K 2.5 Evaporator glide K 2.8 Capacity relative to R-23 126.4% COP relative to R-23 97.2% Discharge temperature difference K 18.1 Condenser pressure difference bar 3.78 50 50 50 50 45 45 45 30 25 25 25 40 35 35 10 15 10 5 10 15 10 10 10 15 20 5 5 10 1831 2571 2006 1441 1656 2396 1831 4.5 4.3 6.1 7.8 2.9 2.7 4.6 4.8 4.6 6.5 8.4 2.8 2.7 4.8 114.4% 113.1% 108.0% 103.4% 119.7% 118.6% 112.7% 96.9% 95.9% 96.9% 98.1% 97.4% 96.5% 97.4% 14.1 16.7 14.6 12.3 9.3 11.8 10.1 2.58 2.66 1.91 1.18 2.98 3.08 2.28 45 43 43 43 43 43 43 25 35 30 30 30 27 25 5 7 10 7 5 8 10 25 15 17 20 22 22 22 1616 1562 2076 1737 1511 1955 2251 9.4 6.4 6.9 8.0 8.6 8.5 8.4 9.7 6.8 7.2 8.3 9.0 8.7 8.6 96.6% 106.3% 103.5% 100.7% 99.0% 98.4% 98.0% 98.9% 98.2% 97.7% 98.4% 98.9% 98.3% 97.9% 8.3 7.6 9.2 7.8 6.8 8.3 9.3 0.29 1.43 1.23 0.80 0.52 0.58 0.62 40 35 35 35 35 35 35 25 50 45 40 35 45 40 10 5 5 5 5 10 10 25 10 15 20 25 10 15 2356 1091 1266 1441 1616 1831 2006 9.3 5.0 6.6 8.1 9.5 4.8 6.4 9.3 5.1 6.9 8.5 9.8 4.9 6.6 93.9% 109.2% 103.3% 97.9% 92.9% 108.7% 102.8% 98.5% 99.2% 99.3% 99.6% 100.0% 98.4% 98.5% 6.8 0.5 0.8 0.8 0.6 2.6 2.9 0.08 1.45 0.83 0.23 −0.35 1.59 0.95 60 55 55 50 50 50 50 25 30 25 40 35 35 30 10 10 10 5 10 5 15 5 5 10 5 5 10 5 1656 1656 1831 916 1656 1091 2396 2.4 2.6 4.3 2.9 2.7 4.7 2.6 2.8 2.8 4.8 2.9 2.8 5.1 2.7 124.6% 123.2% 115.9% 122.8% 121.5% 115.6% 120.2% 96.1% 96.5% 96.4% 98.0% 97.0% 97.8% 96.0% 21.1 17.0 18.1 10.5 13.1 11.5 15.8 3.85 3.59 2.86 3.20 3.30 2.48 3.39 45 45 45 45 45 45 45 35 30 30 30 30 25 25 5 15 10 7 5 15 10 15 10 15 18 20 15 20 1266 2571 2006 1667 1441 2746 2181 6.5 4.4 6.3 7.3 8.0 6.0 7.8 6.9 4.6 6.6 7.7 8.4 6.2 8.0 107.4% 111.6% 106.4% 103.6% 101.8% 105.4% 100.7% 98.4% 96.5% 97.4% 98.1% 98.6% 96.5% 97.6% 8.2 12.6 10.6 9.3 8.4 13.1 10.9 1.51 2.37 1.61 1.17 0.89 1.70 0.98 40 40 40 40 40 40 40 35 35 35 30 30 30 25 15 10 5 20 15 10 15 10 15 20 10 15 20 20 2571 2006 1441 3311 2746 2181 2921 4.6 6.4 8.1 4.4 6.2 7.9 7.7 4.6 6.6 8.5 4.4 6.3 8.1 7.7 110.0% 104.7% 99.9% 109.1% 103.9% 99.1% 98.2% 97.0% 98.0% 99.1% 96.2% 97.1% 98.2% 97.3% 8.6 6.7 4.6 10.9 9.0 6.9 9.2 2.05 1.29 0.57 2.13 1.39 0.67 0.76 35 35 35 35 35 35 35 30 40 35 30 25 10 10 15 15 15 15 20 25 10 15 20 25 2181 2356 2571 2746 2921 3096 7.9 9.3 4.7 6.3 7.7 9.1 8.1 9.4 4.6 6.3 7.7 8.9 97.3% 92.3% 108.2% 102.2% 96.7% 91.5% 98.8% 99.1% 97.6% 97.8% 98.0% 98.3% 3.0 2.8 4.7 5.0 5.1 5.0 0.34 −0.25 1.70 1.05 0.44 −0.16

Compositions of R-1132a, R-744, R-125 and R-116

[0109] The performance of quaternary compositions of the invention were modelled and the results are provided in the following Tables. The tables list the GWP, condenser and evaporator glide, capacity and COP relative to R-23, the difference in discharge temperature and condenser pressure, the maximum VDF in vapour and liquid, the molar percentage of R-1132a. The Tables show the contents as weight percentages, unless otherwise specified.

[0110] The conditions used are as set out in Table 1.

TABLE-US-00003 TABLE 3 R744 60 R1132a 30 R116 5 R125 5 Global Warming Potential (AR4 basis) 786 Cycle calculation results Condenser glide K 2.9 Evaporator glide K 3.3 Capacity relative to R-23 130.8% COP relative to R-23 98.7% Discharge temperature difference K 12.9 Condenser pressure difference bar 4.05 50 50 50 45 45 45 43 20 20 20 40 35 35 35 20 15 10 10 15 10 7 10 15 20 5 5 10 15 2791 2356 1921 1396 2006 1571 1380 5.3 7.2 8.8 3.4 3.5 5.4 7.1 6.9 8.7 10.0 3.8 4.0 6.2 8.0 126.1% 117.0% 108.9% 126.8% 129.4% 119.3% 110.5% 99.9% 99.9% 99.9% 100.0% 100.3% 99.9% 100.0% −0.2 2.6 5.1 −0.2 −2.5 0.8 1.2 3.71 2.66 1.69 3.40 3.75 2.68 1.68 43 43 43 40 40 40 40 25 25 25 35 35 35 30 14 12 10 15 10 5 20 18 20 22 10 15 20 10 2339 2165 1991 2181 1746 1311 2791 8.4 9.0 9.6 5.6 7.3 8.7 5.6 9.8 10.3 10.7 6.6 8.3 9.5 6.9 110.0% 106.9% 104.0% 119.0% 110.4% 102.8% 121.1% 100.7% 100.8% 100.8% 100.6% 100.5% 100.5% 100.8% −2.0 −1.1 −0.2 −5.0 −2.3 0.0 −7.3 1.71 1.33 0.97 2.61 1.64 0.73 2.93 35 35 35 35 35 35 35 40 35 30 40 35 30 25 10 10 10 15 15 15 15 15 20 25 10 15 20 25 1746 1921 2096 2181 2356 2531 2706 7.3 9.0 10.6 5.7 7.5 9.2 10.9 8.2 10.0 11.6 6.5 8.7 10.5 12.2 107.8% 102.3% 97.4% 116.1% 109.8% 104.2% 99.1% 100.9% 101.4% 102.0% 101.0% 101.3% 101.8% 102.4% −5.8 −5.9 −6.2 −8.4 −8.1 −8.3 −8.6 1.24 0.63 0.04 2.19 1.52 0.89 0.28 50 50 50 50 50 50 40 35 30 30 25 25 5 10 15 10 15 10 5 5 5 10 10 15 786 1396 2006 1571 2181 1746 3.2 3.3 3.3 5.2 5.3 7.1 3.4 3.7 4.0 6.2 6.6 8.3 126.7% 129.3% 131.9% 121.5% 123.9% 114.8% 99.4% 99.7% 99.9% 99.5% 99.7% 99.6% 5.6 3.3 1.0 4.4 2.1 4.9 3.42 3.77 4.13 3.03 3.37 2.34 45 45 45 45 43 43 43 35 30 30 30 25 25 25 5 15 10 5 20 18 16 15 10 15 20 12 14 16 1136 2181 1746 1311 2861 2687 2513 7.0 5.5 7.2 8.6 6.3 7.1 7.8 7.8 6.6 8.3 9.5 7.8 8.6 9.2 110.5% 121.5% 112.7% 104.9% 119.8% 116.4% 113.1% 99.7% 100.2% 100.1% 100.0% 100.6% 100.6% 100.7% 3.5 −1.5 1.2 3.7 −5.0 −3.9 −2.9 1.70 3.01 2.00 1.07 2.89 2.48 2.09 40 40 35 35 35 35 35 30 30 50 45 40 35 45 15 10 5 5 5 5 10 15 20 10 15 20 25 10 2356 1921 961 1136 1311 1486 1571 7.4 9.0 5.4 7.1 8.7 10.2 5.6 8.7 10.1 5.8 7.7 9.4 10.9 6.2 112.5% 104.8% 111.7% 105.8% 100.4% 95.5% 113.9% 100.8% 100.9% 100.3% 100.5% 100.9% 101.4% 100.7% −4.6 −2.3 −3.8 −3.5 −3.6 −3.9 −6.1 1.93 1.01 1.60 0.97 0.36 −0.22 1.89

[0111] In summary, the compositions of the invention exhibit an unexpected combination of advantageous properties such as (i) low- or non-flammability, (ii) low GWP compared to existing ultra-low temperature refrigerants (e.g. R-23) and (iii) comparable or improved refrigeration performance at suitable operating temperatures and pressures compared to existing ultra-low temperature refrigerants (e.g. R-23) in terms of, for example, low glide and/or cooling capacity and/or energy efficiency.

[0112] Preferences and options for a given aspect, feature or parameter of the invention should, unless the context indicates otherwise, be regarded as having been disclosed in combination with any and all preferences and options for all other aspects, features and parameters of the invention.

[0113] The invention is defined by the following claims.