Provided are azeotropic and azeotrope-like compositions of 1,2,3,3,3-pentafluoropropene (HFO-1225ye) and water. Such azeotropic and azeotrope-like compositions are useful in isolating 1,2,3,3,3-pentafluoropropene from impurities during production. azeotropes of the instant invention are similarly useful in final compositions or manufacturing final compositions, such as blowing agent, propellants, refrigerants, diluents for gaseous sterilization and the like.
|
0. 87. A method, comprising:
forming an azeotropic composition consisting essentially of effective amounts of water and 1,2,3,3,3-pentafluoropropene;
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
1. An azeotropic or azeotrope-like composition consisting essentially of 1,2,3,3,3-pentafluoropropene (HFO-1225ye) and water wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent.
6. A method of forming an azeotropic or azeotrope-like composition comprising forming a blend consisting essentially of effective amounts of water and 1,2,3,3,3-pentafluoropropene, wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent.
0. 107. A method, comprising:
dehydrofluorinating 1,1,1,2,3,3-hexafluoropropane to produce 1,2,3,3,3-pentafluoropropene and water;
removing an azeotropic mixture of 1,2,3,3,3-pentafluoropropene and water;
separating the 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture; and
producing a hydrofluoroolefin from the 1,2,3,3,3-pentafluoropropene.
0. 101. A method, comprising:
dehydrofluorinating 1,1,1,2,3,3-hexafluoropropane to produce 1,2,3,3,3-pentafluoropropene and water;
removing an azeotropic mixture of 1,2,3,3,3-pentafluoropropene and water;
separating the 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
19. A method for isolating 1,2,3,3,3-pentafluoropropene from an azeotropic mixture containing 1,2,3,3,3-pentafluoropropene and water, comprising separating 1,2,3,3,3-pentafluoropropene from the water, wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent.
0. 89. A method, comprising:
hydrogenating hexafluoropropylene to produce 1,1,1,2,3,3-hexafluoropropane;
dehydrofluorinating the 1,1,1,2,3,3-hexafluoropropane to produce 1,2,3,3,3-pentafluoropropene and water;
providing an azeotropic mixture containing 1,2,3,3,3-pentafluoropropene and water; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 41. A method, comprising:
forming a blend consisting essentially of effective amounts of water and 1,2,3,3,3-pentafluoropropene;
wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 95. A method, comprising:
hydrogenating hexafluoropropylene to produce 1,1,1,2,3,3-hexafluoropropane;
dehydrofluorinating the 1,1,1,2,3,3-hexafluoropropane to produce 1,2,3,3,3-pentafluoropropene and water;
removing an azeotropic mixture of 1,2,3,3,3-pentafluoropropene and water;
separating the 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 57. A method, comprising:
providing an azeotropic mixture containing 1,2,3,3,3-pentafluoropropene and water;
separating 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture;
wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
11. A method for removing 1,2,3,3,3-pentafluoropropene from a mixture containing 1,2,3,3,3-pentafluoropropene and at least one impurity, comprising adding water to the mixture in an effective amount to form an azeotropic or azeotrope-like composition of the 1,2,3,3,3-pentafluoropropene and the water, and separating the azeotropic composition from the impurity, wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent.
0. 82. A method, comprising:
dehydrofluorinating 1,1,1,2,3,3-hexafluoropropane to produce 1,2,3,3,3-pentafluoropropene and water;
removing an azeotropic mixture of 1,2,3,3,3-pentafluoropropene and water;
wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent;
separating the 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 67. A method, comprising:
hydrogenating hexafluoropropylene to produce 1,1,1,2,3,3-hexafluoropropane;
dehydrofluorinating the 1,1,1,2,3,3-hexafluoropropane to produce an azeotropic mixture of 1,2,3,3,3-pentafluoropropene and water;
wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent;
separating 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 77. A method, comprising:
hydrogenating hexafluoropropylene to produce 1,1,1,2,3,3-hexafluoropropane;
dehydrofluorinating the 1,1,1,2,3,3-hexafluoropropane to produce 1,2,3,3,3-pentafluoropropene and water;
removing an azeotropic mixture of 1,2,3,3,3-pentafluoropropene and water;
wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent
separating the 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 72. A method, comprising:
hydrogenating hexafluoropropylene to produce 1,1,1,2,3,3-hexafluoropropane;
dehydrofluorinating the 1,1,1,2,3,3-hexafluoropropane to produce 1,2,3,3,3-pentafluoropropene and water;
providing an azeotropic mixture containing 1,2,3,3,3-pentafluoropropene and water;
wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent; separating 1,2,3,3,3-pentafluoropropene from the water in the azeotropic mixture; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 46. A method, comprising:
removing 1,2,3,3,3-pentafluoropropene from a mixture containing 1,2,3,3,3-pentafluoropropene and at least one impurity, comprising:
adding water to the mixture in an effective amount to form an azeotropic or azeotrope-like composition of the 1,2,3,3,3-pentafluoropropene and the water;
wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent; and
separating the azeotropic composition from the impurity; and
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
3. The composition of
4. The composition of
5. The composition of
7. The method of
8. The method of
9. The method of
10. The method of
12. The method of
13. The method of
14. The method of
15. The method of
16. The method of
17. The method of
18. The method of
20. The method of
21. The method of
22. The method of
23. The method of claim 19 22, wherein the drying media is selected from the group consisting of a molecular sieve, silica alumina, and combinations thereof.
24. The method of
0. 25. The method of claim 6, further comprising:
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 26. The method of claim 11, further comprising:
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 27. The method of claim 11, wherein the mixture consists of water, 1,2,3,3,3-pentafluoropropene, and the impurity.
0. 28. The method of claim 11, wherein the azeotropic or azeotrope-like composition has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 29. The method of claim 11, wherein the azeotropic or azeotrope-like composition has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 30. The method of claim 11, wherein the azeotropic or azeotrope-like composition has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 31. The method of claim 11,
wherein the impurity comprises hydrogen fluoride.
0. 32. The method of claim 11,
wherein the impurity comprises 1,1,1,2,3,3-hexafluoropropane (HFC-236ea).
0. 33. The method of claim 11,
wherein the impurity comprises 1,1,1,2,3-pentafluoropropane (HFC-245eb).
0. 34. The method of claim 11,
wherein the impurity comprises hexafluoropropylene (HFP).
0. 35. The method of claim 11,
wherein the impurity comprises 1,1,1,2-tetrafluoropropene (HFO-1234yf).
0. 36. The method of claim 19, further comprising:
producing 2,3,3,3-tetrafluoro-1-propene from the 1,2,3,3,3-pentafluoropropene.
0. 37. The method of claim 19, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 38. The method of claim 19, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 39. The method of claim 19, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 40. The method of claim 19, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 42. The method of claim 41, wherein the blend consists of water and 1,2,3,3,3-pentafluoropropene.
0. 43. The method of claim 41, wherein the blend has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 44. The method of claim 41, wherein the blend has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 45. The method of claim 41, wherein the blend has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 47. The method of claim 46, wherein the azeotropic or azeotrope-like composition consists of water and 1,2,3,3,3-pentafluoropropene.
0. 48. The method of claim 46, wherein the azeotropic or azeotrope-like composition has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 49. The method of claim 46, wherein the azeotropic or azeotrope-like composition has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 50. The method of claim 46, wherein the azeotropic or azeotrope-like composition has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 51. The method of claim 46, wherein the impurity is selected from the group consisting of hydrogen fluoride; 1,1,1,2,3,3-hexafluoropropane (HFC-236ea); 1,1,1,2,3-pentafluoropropane (HFC-245eb); hexafluoropropylene (HFP); 1,1,1,2-tetrafluoropropene (HFO-1234yf); and combinations thereof.
0. 52. The method of claim 46,
wherein the impurity comprises hydrogen fluoride.
0. 53. The method of claim 46,
wherein the impurity comprises 1,1,1,2,3,3-hexafluoropropane (HFC-236ea).
0. 54. The method of claim 46,
wherein the impurity comprises 1,1,1,2,3-pentafluoropropane (HFC-245eb).
0. 55. The method of claim 46,
wherein the impurity comprises hexafluoropropylene (HFP).
0. 56. The method of claim 46,
wherein the impurity comprises 1,1,1,2-tetrafluoropropene (HFO-1234yf).
0. 58. The method of claim 57, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 59. The method of claim 57, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 60. The method of claim 57, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 61. The method of claim 57, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 62. The method of claim 57, wherein 1,2,3,3,3-pentafluoropropene is separated from water using a liquid-liquid phase separation.
0. 63. The method of claim 57, wherein 1,2,3,3,3-pentafluoropropene is separated from water using distillation.
0. 64. The method of claim 57, wherein 1,2,3,3,3-pentafluoropropene is separated from water using at least one drying media.
0. 65. The method of claim 64, wherein the drying media is selected from the group consisting of a molecular sieve, silica alumina, and combinations thereof.
0. 66. The method of claim 57, wherein water is removed first by liquid-liquid phase separation, then by a second method selected from the group consisting of distillation, one or more drying media, and combinations thereof.
0. 68. The method of claim 67, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 69. The method of claim 67, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 70. The method of claim 67, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 71. The method of claim 67, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 73. The method of claim 72, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 74. The method of claim 72, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 75. The method of claim 72, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 76. The method of claim 72, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 78. The method of claim 77, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 79. The method of claim 77, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 80. The method of claim 77, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 81. The method of claim 77, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 83. The method of claim 82, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 84. The method of claim 82, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 85. The method of claim 82, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 86. The method of claim 82, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 88. A method of claim 87, wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent.
0. 90. A method of claim 89, wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent in the azeotropic mixture.
0. 91. The method of claim 89, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 92. The method of claim 89, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 93. The method of claim 89, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 94. The method of claim 89, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 96. A method of claim 95, wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent in the azeotropic mixture.
0. 97. The method of claim 95, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 98. The method of claim 95, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 99. The method of claim 95, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 100. The method of claim 95, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 102. A method of claim 101, wherein water is provided in an amount from about 0.25 to about 11 weight percent and 1,2,3,3,3-pentafluoropropene is provided in an amount from about 89 to about 99.75 weight percent.
0. 103. The method of claim 101, wherein the azeotropic mixture consists of water and 1,2,3,3,3-pentafluoropropene.
0. 104. The method of claim 101, wherein the azeotropic mixture has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia.
0. 105. The method of claim 101, wherein the azeotropic mixture has a boiling point of about −20° C. at a pressure of about 14.3 psia.
0. 106. The method of claim 101, wherein the azeotropic mixture has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
0. 108. The method of claim 107,
wherein the hydrofluoroolefin is 2,3,3,3-tetrafluoro-1-propene.
|
|||||||||||||||||||||||||||||||
This application is related to and claims the priority benefit of U.S. provisional application Ser. No. 61/331,971, filed May 6, 2010, the contents of which are incorporated herein by reference.
The present invention pertains to azeotropic and azeotrope-like compositions of 1,2,3,3,3-pentafluoropropene (HFO-1225ye) and water.
Traditionally, chlorofluorocarbons (CFCs) like trichlorofluoromethane and dichlorodifluoromethane have been used as refrigerants, blowing agents and diluents for gaseous sterilization. In recent years, there has been universal concern that completely halogenated chlorofluorocarbons might be detrimental to the Earth's ozone layer. Therefore, stratospherically safer alternatives to these materials are desirable.
There is presently a worldwide effort to use fluorine-substituted hydrocarbons which contain fewer or no chlorine substituents. The production of HFCs, i.e. compounds containing only carbon, hydrogen and fluorine, has been the subject of interest to provide environmentally desirable products that could provide a substitute to CFCs. Such compounds are known in the art to be produced by reacting hydrogen fluoride with various hydrochlorocarbon compounds. While HFCs are considered to be much more environmentally advantageous than hydrochlorofluorocarbons (HCFCs) or chlorofluorocarbons (CFCs) because they are not non-ozone depleting, recent data indicates that they may also contribute to greenhouse global warming. Accordingly, alternatives to HFCs, HCFCs, and CFCs are also being explored.
Hydrofluoroolefins (“HFOs”) have been proposed as possible replacements. Two such HFOs are 1,2,3,3,3-pentafluoropropene (HFO-1225ye) and 2,3,3,3-tetrafluoropropene (HFO-1234yf). As disclosed in US 20090234165, the contents of which are incorporated herein by reference, HFO-1225ye is known to be produced as an intermediate in the production of HFO-1234yf. Each of these HFOs have been well characterized as effective refrigerant, heat transfer medium, propellant, foaming agent, blowing agent, gaseous dielectric, sterilant carrier, polymerization medium, particulate removal fluid, carrier fluid, buffing abrasive agent, displacement drying agent and power cycle working fluid.
It is, nevertheless, generally known that HFOs are best used as a single component fluid or azeotropic mixture, neither of which fractionate upon boiling and evaporation. The identification of such compositions is difficult due, at least in part, to the relative unpredictability of azeotrope formation. Therefore, industry is continually seeking new HFO-based mixtures that are acceptable and environmentally safer substitutes for CFCs, HCFCs, and HFCs. This invention satisfies these needs among others.
The invention provides an azeotropic or azeotrope-like composition of 1,2,3,3,3-pentafluoropropene (HFO-1225ye) and water. The compositions of the instant invention provide environmentally desirable replacements for currently used CFCs, HFCs and HCFCs, since HFO-1225ye and water have little to no ozone depletion potential. Additionally, a composition containing such an azeotrope exhibits characteristics that make it better than CFCs, HFCs, and HCFCs substitutes, as well as either HFO-1225ye or water alone.
The invention further provides a composition and method of forming an azeotropic or azeotrope-like composition which comprises a blend of from about 0.1 to about 50 weight percent water and about 50 to 99.9 weight percent HFO-1225ye. In further embodiments, the azeotropic or azeotrope-like composition comprises a blend of from about 0.1 to about 25 weight percent water and about 75 to 99.9 weight percent HFO-1225ye, and in even further embodiments it comprises a blend of from about 0.25 to about 11 weight percent water and about 89 to 99.75 weight percent HFO-1225ye. The resulting azeotrope has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3 psia±2 psia. In further embodiments, the azeotrope has a boiling point of about −20° C. at a pressure of about 14.3 psia, and in even further embodiments, the azeotrope has a boiling point of about −20.3° C. at a pressure of about 14.39 psia.
The instant invention also relates to a method for removing 1,2,3,3,3-pentafluoropropene from a mixture containing 1,2,3,3,3-pentafluoropropene and at least one impurity by adding water to the mixture in an effective amount to form an azeotropic or azeotrope-like composition in accordance with the foregoing. This azeotrope is then separated from impurities using standard methods known in the art, such as but not limited to, distillation. Impurities may include a halocarbon or hydrogen fluoride, which may or may not be miscible with 1,2,3,3,3-pentafluoropropene. Examples of halocarbons include, but are not limited to, 1,1,1,2,3,3-hexafluoropropane (HFC-236ea); 1,1,1,2,3-pentafluoropropane (HFC-245eb); hexafluoropropylene (HFP); 1,1,1,2-tetrafluoropropene (HFO-1234yf); and combinations thereof. In further embodiments, the impurities may or may not also form an azeotropic mixture 1,2,3,3,3-pentafluoropropene, water or a mixture of 1,2,3,3,3-pentafluoropropene and water.
The instant invention also relates to a method for isolating 1,2,3,3,3-pentafluoropropene from an azeotropic mixture of 1,2,3,3,3-pentafluoropropene and water, by separating 1,2,3,3,3-pentafluoropropene from the water. Separation methods may include any one or combination of methods known in the art or otherwise discussed herein. For example, 1,2,3,3,3-pentafluoropropene may be separated using a liquid-liquid phase separation. In alternative embodiments, 1,2,3,3,3-pentafluoropropene may be separated using distillation and/or one or more drying media (e.g. a molecular sieve, silica alumina, or the like). In further embodiments, separation methods may include a combination of liquid-liquid phase separation and a second method selected from distillation and/or one or more drying media.
Additional embodiments and advantages of the instant invention will be apparent to one of ordinary skill in the art, based on the disclosure provided herein.
In one aspect of the instant invention, an azeotropic or azeotrope-like composition is provided of 1,2,3,3,3-pentafluoropropene (HFO-1225ye) and water. This composition provides environmentally desirable replacements for currently used CFCs, HFCs, and HCFCs, since HFO-1225ye and water have little to no ozone depletion potential. Additionally, a composition containing such an azeotrope exhibits characteristics that make it better than CFC, HFC, and HCFC substitutes, as well as HFO-1225ye or water alone. In another aspect of the instant invention, the azeotrope or azeotrope-like composition of HFO-1225ye and water is used to isolate a purified form of HFO-1225ye. As used in this invention, “HFO-1225ye” refers to either the “E” or the “Z” isomers individually or a mixture thereof.
For purposes of this invention, azeotrope or azeotrope-like mixtures of HFO-1225ye and water, include those compositions or mixtures that behave like azeotropes. The thermodynamic state of a fluid is defined by its pressure, temperature, liquid composition and vapor composition. For a true azeotropic composition, the liquid composition and vapor phase are essentially equal at a given temperature and pressure range. In practical terms this means that the components cannot be separated during a phase change. For the purpose of this invention, an azeotrope is a liquid mixture that exhibits a maximum or minimum boiling point relative to the boiling points of surrounding mixture compositions. An azeotrope or an azeotrope-like composition is an admixture of two or more different components which, when in liquid form under given pressure, will boil at a substantially constant temperature, which temperature may be higher or lower than the boiling temperatures of the components and which will provide a vapor composition essentially identical to the liquid composition undergoing boiling. For the purpose of this invention, azeotropic compositions are defined to include azeotrope-like compositions which means a composition that behaves like an azeotrope, i.e., has constant-boiling characteristics or a tendency not to fractionate upon boiling or evaporation. Thus, the composition of the vapor formed during boiling or evaporation is the same as or substantially the same as the original liquid composition. Hence, during boiling or evaporation, the liquid composition, if it changes at all, changes only to a minimal or negligible extent. This is in contrast with non-azeotrope-like compositions in which during boiling or evaporation, the liquid composition changes to a substantial degree. Accordingly, the essential features of an azeotrope or an azeotrope-like composition are that at a given pressure, the boiling point of the liquid composition is fixed and that the composition of the vapor above the boiling composition is essentially that of the boiling liquid composition, i.e., essentially no fractionation of the components of the liquid composition takes place. Both the boiling point and the weight percentages of each component of the azeotropic composition may change when the azeotrope or azeotrope-like liquid composition is subjected to boiling at different pressures. Thus, an azeotrope or an azeotrope-like composition may be defined in terms of the relationship that exists between its components or in terms of the compositional ranges of the components or in terms of exact weight percentages of each component of the composition characterized by a fixed boiling point at a specified pressure.
Accordingly, the invention provides azeotrope-like compositions having effective amounts of HFO-1225ye and water. As used herein, “effective amounts” means an amount of each component that, on combination with the other component, results in the formation of an azeotrope-like composition. In certain embodiments, the azeotropic or azeotrope-like composition comprises a blend of from about 0.1 to about 50 weight percent water and about 50 to 99.9 weight percent HFO-1225ye. In further embodiments, the azeotropic or azeotrope-like composition comprises a blend of from about 0.1 to about 25 weight percent water and about 75 to 99.9 weight percent HFO-1225ye, and in even further embodiments azeotropic or azeotrope-like composition comprises a blend of from about 0.25 to about 11 weight percent water and about 89 to 99.75 weight percent HFO-1225ye. The azeotropic mixture of the present invention has a boiling point of about −20° C.±0.5° C. at a pressure of about 14.3±2 psia. In further embodiments, azeotropic mixture of the present invention has a boiling point of about −20° C. at a pressure of about 14.3. In an even further embodiment, the azeotrope has a boiling point of from about −20.3° C. at a pressure of from about 14.39 psia.
In one embodiment, the methods of the instant invention include the steps for generating the HFO-1225ye and HFO-1225ye/water azeotrope and for isolating the azeotrope from impurities. The instant methods also include steps for purifying HFO-1225ye from the azeotropic mixture, which are discussed in greater detail below. HFO-1225ye may be produced using one or more methods that are known in the art. In one non-limiting example, 1,2,3,3,3-pentafluoropropene (HFO-1225ye) is produced as an intermediate in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf) which is well known in the art as described in US Application No. 20090234165, the specifications of which are incorporated herein by reference. More specifically, HFO-1225ye may be produced by the initial hydrogenation of a hexafluoropropylene (HFP) to produce 1,1,1,2,3,3-hexafluoropropane (HFC-236ea). This is then used as a reactant in a dehydrohalogenation reaction to produce HFO-1225ye.
The first step in removing HFO-1225ye from this mixture, or any other mixture containing HFO-1225ye and an impurity, is by adding water in an effective amount, as defined herein, to form an azeotropic composition of the HFO-1225ye and water. Thereafter, the azeotropic composition is separated from the impurity using standard separation techniques, such as, but not limited to, distillation, scrubbing, or other art recognized separating means. In one embodiment, the impurity itself does not form an azeotropic mixture with HFO-1225ye, water or a mixture of HFO-1225ye and water. In another embodiment, the impurity does form an azeotropic mixture with HFO-1225ye, water or a mixture of HFO-1225ye and water. Typical impurities of HFO-1225ye include, but are not limited to, other halocarbons which may be miscible with HFO-1225ye such as, but not limited to, 1,1,1,2,3,3-hexafluoropropane (HFC-236ea); 1,1,1,2,3-pentafluoropropane (HFC-245eb); hexafluoropropylene (HFP); 1,1,1,2-tetrafluoropropene (HFO-1234yf); and combinations thereof. In further embodiments, the impurity is hydrogen fluoride.
This purified azeotrope meets the need in the art for HFO mixtures that have no ozone depletion potential and are negligible contributors to greenhouse global warming and are nonflammable. Such a mixture may be utilized in a wide range of uses such as, but not limited, refrigerants, blowing agents, propellants and diluents for gaseous sterilization. The azeotrope may be provided in combination with other useful additives or ingredients for such purposes.
Post-purification, it also may be desirable to separate component parts of the HFO-1225ye and water azeotrope to a purified form HFO-1225ye. Separation methods may include any method generally known in the art. In one embodiment, for example, the excess water can be removed from the HFO-1225ye by liquid-liquid phase separation. The remaining water can then be removed from the HFO-1225ye by distillation and/or one or more drying media (e.g. molecular sieves silica alumina, and the like). Purified HFO-1225ye may be used as an end product (i.e. as a refrigerant, blowing agent, propellant, diluents for gaseous sterilization, or the like), or it may be further processed for the production of alternative HFOs or similar compounds.
The following non-limiting examples serve to illustrate the invention.
A glass vacuum insulated vessel fitted with a dry ice cooled condenser is initially charged with HFO-(Z)-1225ye. Water is then added incrementally and the temperature of the mixture is recorded. The temperature of the mixture reaches a minimum values and then flattens indicating the formation of a heterogeneous azeotrope. The ambient pressure during the measurements was 14.3 psia. The measured temperatures are shown in Table 1.
TABLE 1
Ebulliometer measurements of HFO-(Z)-1225ye and water at 14.39 psi
water, wt %
Temp, ° C.
0.00
−20.19
0.25
−20.31
0.75
−20.32
1.74
−20.31
3.65
−20.31
7.26
−20.31
10.61
−20.31
13.73
−20.32
16.64
−20.32
Pham, Hang T., Kopkalli, Haluk, Hulse, Ryan
| Patent | Priority | Assignee | Title |
| 11286222, | Jun 16 2017 | Daikin Industries, Ltd | Azeotrope or azeotropic composition containing pentafluoropropane and water, and method for producing pentafluoropropane |
| 11724975, | Jun 16 2017 | Daikin Industries, Ltd. | Azeotrope or azeotropic composition containing pentafluoropropane and water, and method for producing pentafluoropropane |
| Patent | Priority | Assignee | Title |
| 7794618, | Dec 13 2007 | Honeywell International Inc. | Azeotrope-like compositions of pentafluoropropene and 1,1,1,2,2-pentafluoropropane |
| 8288597, | Sep 05 2006 | THE CHEMOURS COMPANY FC, LLC | Dehydrofluorination process to manufacture hydrofluoroolefins |
| 8410325, | Dec 19 2006 | MEXICHEM AMANCO HOLDING S A DE C V | Process for the preparation of C3-7 fluoroalkenes by base-mediated dehydrohalogenated C3-7 fluoroalkenes |
| 20060106263, | |||
| 20070099811, | |||
| 20070100173, | |||
| 20080011678, | |||
| 20080051611, | |||
| 20080051612, | |||
| 20090012336, | |||
| 20090151365, | |||
| 20090234165, | |||
| 20100048961, | |||
| 20100119460, | |||
| 20100162738, | |||
| 20110160500, | |||
| 20110172472, | |||
| 20110190554, | |||
| 20110275723, | |||
| 20110275724, | |||
| 20120056122, | |||
| 20120065435, | |||
| 20120128964, | |||
| 20120283339, | |||
| 20130060069, | |||
| FR2935702, | |||
| GB2439209, | |||
| WO2100506, | |||
| WO2006094303, | |||
| WO2007144632, | |||
| WO2008024508, | |||
| WO2008030444, | |||
| WO2008033568, | |||
| WO2011139945, |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Feb 10 2017 | THE CHEMOURS COMPANY FC, LLC | (assignment on the face of the patent) | / | |||
| Mar 20 2017 | THE CHEMOURS COMPANY FC, LLC | JPMORGAN CHASE BANK, N A , AS ADMINISTRATIVE AGENT | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 041730 | /0706 | |
| Mar 20 2017 | THE CHEMOURS COMPANY TT, LLC | JPMORGAN CHASE BANK, N A , AS ADMINISTRATIVE AGENT | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 041730 | /0706 | |
| Apr 03 2018 | THE CHEMOURS COMPANY FC, LLC | JPMORGAN CHASE BANK, N A , AS ADMINISTRATIVE AGENT | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 045846 | /0011 | |
| Apr 03 2018 | JPMORGAN CHASE BANK, N A , AS ADMINISTRATIVE AGENT | THE CHEMOURS COMPANY FC, LLC | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 045845 | /0913 |
| Date | Maintenance Fee Events |
| Aug 02 2018 | M1551: Payment of Maintenance Fee, 4th Year, Large Entity. |
| Jul 20 2022 | M1552: Payment of Maintenance Fee, 8th Year, Large Entity. |
| Date | Maintenance Schedule |
| Jul 03 2021 | 4 years fee payment window open |
| Jan 03 2022 | 6 months grace period start (w surcharge) |
| Jul 03 2022 | patent expiry (for year 4) |
| Jul 03 2024 | 2 years to revive unintentionally abandoned end. (for year 4) |
| Jul 03 2025 | 8 years fee payment window open |
| Jan 03 2026 | 6 months grace period start (w surcharge) |
| Jul 03 2026 | patent expiry (for year 8) |
| Jul 03 2028 | 2 years to revive unintentionally abandoned end. (for year 8) |
| Jul 03 2029 | 12 years fee payment window open |
| Jan 03 2030 | 6 months grace period start (w surcharge) |
| Jul 03 2030 | patent expiry (for year 12) |
| Jul 03 2032 | 2 years to revive unintentionally abandoned end. (for year 12) |