Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/02—Materials undergoing a change of physical state when used
  • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
  • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
  • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
  • C08J9/143—Halogen containing compounds
  • C08J9/144—Halogen containing compounds containing carbon, halogen and hydrogen only
  • C08J9/146—Halogen containing compounds containing carbon, halogen and hydrogen only only fluorine as halogen atoms
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/30—Materials not provided for elsewhere for aerosols
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/02—Materials undergoing a change of physical state when used
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
  • C09K5/02—Materials undergoing a change of physical state when used
  • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
  • C09K5/041—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems
  • C09K5/044—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds
  • C09K5/045—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for compression-type refrigeration systems comprising halogenated compounds containing only fluorine as halogen
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/50—Solvents
  • C11D7/5036—Azeotropic mixtures containing halogenated solvents
  • C11D7/504—Azeotropic mixtures containing halogenated solvents all solvents being halogenated hydrocarbons
  • C11D7/5063—Halogenated hydrocarbons containing heteroatoms, e.g. fluoro alcohols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2205/00—Foams characterised by their properties
  • C08J2205/04—Foams characterised by their properties characterised by the foam pores
  • C08J2205/052—Closed cells, i.e. more than 50% of the pores are closed
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2207/00—Foams characterised by their intended use
  • C08J2207/04—Aerosol, e.g. polyurethane foam spray
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
  • C09K2205/10—Components
  • C09K2205/12—Hydrocarbons
  • C09K2205/122—Halogenated hydrocarbons
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K2205/00—Aspects relating to compounds used in compression type refrigeration systems
  • C09K2205/10—Components
  • C09K2205/12—Hydrocarbons
  • C09K2205/126—Unsaturated fluorinated hydrocarbons

Definitions

• the present invention provides azeotrope-like compositions of 1,1,1,2- tetrafluoropropene and trifluoroiodomethane, and uses thereof.
• Fluorocarbon based fluids have found widespread use in industry in a number of applications, including as refrigerants, aerosol propellants, blowing agents, heat transfer media, and gaseous dielectrics. Because of the suspected environmental problems associated with the use of some of these fluids, including the relatively high ozone depletion potentials associated therewith, it is desirable to use fluids having low or even zero ozone depletion potential, such as hydrofluorocarbons ("HFCs"). Thus, the use of fluids that do not contain chlorofluorocarbons (“CFCs”) or hydrochlorofluorocarbons (“HCFCs”) is desirable.
• CFCs chlorofluorocarbons
• HCFCs hydrochlorofluorocarbons
• HFC fluids may have relatively high global warming potentials associated therewith, and it is desirable to use hydrofluorocarbon or other fluorinated fluids having as low global warming potentials as possible while maintaining the desired performance in use properties.
• hydrofluorocarbon or other fluorinated fluids having as low global warming potentials as possible while maintaining the desired performance in use properties.
• the use of single component fluids or azeotrope-like mixtures, which do not substantially fractionate on boiling and evaporation is desirable.
• the identification of new, environmentally-safe, non-fractionating mixtures is complicated due to the fact that azeotrope formation is not readily predictable.
• the industry is continually seeking new fluorocarbon based mixtures that offer alternatives, and are considered environmentally safer substitutes for CFCs and HCFCs.
• mixtures containing both hydrofluorocarbons and other fluorinated compounds both of very low or zero ozone depletion and low global warming potentials. Such mixtures and their uses are the subject of this invention.
• the present invention provides azeotrope-like compositions comprising 1,1,1,2-tetrafluoropro ⁇ ene ("HFO-1234yf ') and trifluoroiodomethane
• compositions of the invention tend both to be nonflammable and to exhibit relatively low global warming potentials ("GWPs”), preferably less than about 1000, more preferably less than about 500, and even more preferably less than about 150. Accordingly, applicants have recognized that such compositions can be used to great advantage in a number of applications, including as replacements for CFCs, such as dichlorodifluormethane (CFC-12), HCFCs, such as difluorochloromethane, (HCFC-22), HFCs, such as HFC- 134a, and combinations of HFCs and CFCs, such as the combination of CFC-12 and 1,1-difluorethane (HFC-152a) (the combination CFC-12:HFC-152a in a 73.8:26.2 mass ratio being known as R-500) in refrigerant, aerosol, and other applications.
• CFCs such as dichlorodifluormethane (CFC-12), HCFCs, such as difluorochloromethane, (HC
• HFO-1234 is used herein to refer to all tetrafluoropropenes. Among the tetrafluoropropenes is included HFO-1234yf and any and all stero- or geometric isomers thereof.
• HFO-1234yf and HFO-1234ze are used herein generically to refer to 1, 1, 1, 2-tetrafluoropropene and 1, 1, 1, 3- tetrafluoropropene, respectively, independent of its stero isometry. Although the properties of HFO-1234yf and HFO-1234ze differ in at least some respects, and while the present azeotrope-like compositions are based mainly on HFO-1234yf, it is contemplated that HFO-1234ze may be present in certain embodiments in amounts which do not negate the essential nature of the azeotrope-like composition. HFO-1234 compounds are known materials and are listed in Chemical Abstracts databases.
• EP 974,571 discloses the preparation of 1,1,1,3- tetrafluoropropene by contacting 1,1,1,3,3-pentafluoropropane (HFC-245fa) in the vapor phase with a chromium-based catalyst at elevated temperature, or in the liquid phase with an alcoholic solution of KOH, NaOH, Ca(OH) 2 or Mg(OH) 2
• HFC-245fa 1,1,1,3,3-pentafluoropropane
• azeotrope-like compositions of the present invention exhibits properties that make that make them advantageous for use as, or in, numerous applications, including as heat transfer compositions, including as refrigerants in automotive air conditioning and heat pump systems, and in stationary air conditioning, heat pump and refrigeration blowing agents, propellants and sterilizing agents. Accordingly, in yet other embodiments, the present invention provides compositions and methods associated with these and other uses.
• Azeotrope-like Compositions As used herein, the term "azeotrope-like" is intended in its broad sense to include both compositions that are strictly azeotropic and compositions that behave like azeotropic mixtures. From fundamental principles, the thermodynamic state of a fluid is defined by pressure, temperature, liquid composition, and vapor composition.
• An azeotropic mixture is a system of two or more components in which the liquid composition and vapor composition are equal at the stated pressure and temperature. In practice, this means that the components of an azeotropic mixture are constant-boiling and cannot be separated during a phase change.
• the azeotrope-like compositions of the invention may include additional components that do not form new azeotrope-like systems, or additional components that are not in the first distillation cut.
• the first distillation cut is the first cut taken after the distillation column displays steady state operation under total reflux conditions.
• One way to determine whether the addition of a component forms a new azeotrope-like system so as to be outside of this invention is to distill a sample of the composition with the component under conditions that would be expected to separate a non-azeotropic mixture into its separate components. If the mixture containing the additional component is non- azeotrope-like, the additional component will fractionate from the azeotrope-like components.
• azeotrope-like compositions there is a range of compositions containing the same components in varying proportions that are azeotrope-like or constant boiling. All such compositions are intended to be covered by the terms "azeotrope-like" and "constant boiling". As an example, it is well known that at differing pressures, the composition of a given azeotrope will vary at least slightly, as does the boiling point of the composition.
• an azeotrope of A and B represents a unique type of relationship, but with a variable composition depending on temperature and/or pressure. It follows that, for azeotrope-like compositions, there is a range of compositions containing the same components in varying proportions that are azeotrope-like. All such compositions are intended to be covered by the term azeotrope-like as used herein. It is well-recognized in the art that it is not possible to predict the formation of azeotropes. (See, for example, U.S. Patent No. 5,648,017 (column 3, lines 64-65) and U.S. Patent No. 5,182,040 (column 3, lines 62-63), both of which are incorporated herein by reference).
• the azeotrope-like compositions of the present invention comprise, and preferably consist essentially of, effective azeotrope-like amounts of HFO-1234yf and CF 3 I.
• effective azeotrope-like amounts refers to the amount of each component which upon combination with the other component, results in the formation of an azeotrope-like composition of the present invention.
• the present azeotrope-like compositions comprise, and preferably consist essentially of, from about 25 to less than 100 weight percent HFO-1234yf and from greater than zero to about 75 weight percent of CF 3 I.
• the azeotrope-like compositions comprise, and preferably consist essentially of, from about 30 to about 85 weight percent HFO-1234yf and from about 15 to about 70 weight percent of CF 3 I, more preferably from about 35 to about 70 weight percent HFO-1234yf and from about 30 to about 65 weight percent of CF 3 I, even more preferably from about 45 to about 70 weight percent HFO-1234yf and from about 30 to about 55 weight percent of CF 3 I, and even more preferably from about 50 to about 60 weight percent HFO-1234yf and from about 40 to about 50 weight percent of CF 3 I.
• the weight percents disclosed herein are based on the total weight of CF 3 I and HFO-1234yf in a composition.
• the azeotrope-like compositions described herein preferably have a boiling point of from about -28°C to about -31°C at a pressure of about 14.26 psia. In certain more preferred embodiments, the present azeotrope-like compositions have a boiling point of from about -29°C to about -31°C at a pressure of about 14.26 psia, and in even more preferred embodiments, from about -30°C to about -31°C at a pressure of about 14.26 psia.
• the azeotrope-like compositions of the present invention can be produced by combining effective azeotrope-like amounts of HFO-1234yf and CF 3 I.
• any of a wide variety of methods known in the art for combining two or more components to form a composition can be adapted for use in the present methods to produce an azeotrope-like composition.
• HFO-1234yf and CF 3 I can be mixed, blended, or otherwise combined by hand and/or by machine, as part of a batch or continuous reaction and/or process, or via combinations of two or more such steps.
• those of skill in the art will be readily able to prepare azeotrope-like compositions according to the present invention without undue experimentation.
• the azeotrope-like compositions of the present invention may further include any of a variety of optional additives including lubricants, stabilizers, metal passivators, corrosion inhibitors, flammability suppressants, and the like. According to certain embodiments, the azeotrope-like compositions of the present invention further comprise a stabilizer. Any of a variety of compounds suitable for stabilizing an azeotrope-like composition of the present invention may be used.
• stabilizer compositions comprising stabilizing diene-based compounds, and/or phenol compounds and/or epoxides selected from the group consisting of aromatic epoxides, alkyl epoxides, alkenyl epoxides, and combinations of two or more thereof.
• diiene-based compound refers to C3 - C5 dienes and to compounds formed by reaction of any two or more C3 - C5 dienes. In the case of diene-based compounds which are formed by a combination of C3- C5 dienes, the molecules which are combined can be the same or different.
• compositions comprise at least one diene-based compound in an amount effective under conditions of use to stabilize the iodocarbon against degradation.
• the type and nature of the diene-based compound(s) to be used may depend, to at least some degree, upon the particular iodocarbon compound(s) being used in the composition, the expected conditions of use of the compositions, and related factors. It is generally contemplated that the amount of the diene-based stabilizer used in the compositions of the present invention can vary widely, depending upon factors such as the type of iodocarbon in the composition, the expected conditions of use of the composition, among other factors. In general, it is preferred to use diene-based stabilizer in an effective amount relative to the iodocarbon being used.
• the term "effective amount” refers to an amount of diene-based compound(s) which, when added to a composition comprising the relevant iodocarbon compound, such as trifluoroiodomethane, results in a stabilized composition wherein the iodocarbon degrades more slowly and/or to lesser degree relative to the same composition, under the same, or similar, conditions, but in the absence of the diene-based compounds.
• the relevant iodocarbon compound such as trifluoroiodomethane
• trifluoroiodomethane one of the important potential breakdown products under certain severe conditions is trifluoromethane, which is formed by the substitution of hydrogen for iodine in the CF 3 I molecule.
• the amount of the diene-based compound(s) is sufficient to result in a stabilized composition wherein at least one of the iodocarbon compound(s) therein degrades more slowly and/or to a lesser degree relative to the same composition but in the absence of the diene-base compound, when tested according to SAE J1662 (issued June 1993) and/or ASHRAE 97-1983R standard tests.
• the amount of breakdown product, that is product formed by the substitution of hydrogen for iodine in the iodocarbon is less than about 0.9 wt. % after the composition is maintained at about 300°F for about two weeks.
• the diene-based compounds are present in the composition in amounts of from about 0.001 % to about 10 % by weight, more preferably from about 0.01 wt. % to about 5 wt. %, and even more preferably from about 0.3 wt. % to about 4 wt. %, based on the total weight of refrigerant composition that is comprised of the iodocarbon.
• the diene-based compounds are selected from the group consisting of allyl ethers, propadiene, butadiene, isoprene, terpenes such as myrcene, te ⁇ ene derivatives and combinations of any two or more of these.
• each of the compounds identified in the immediately preceding list is intended to include both substituted and unsubstituted forms of the identified compounds.
• the diene-based compounds comprise in major proportion, and even more preferably consist essentially of, propadiene.
• the diene-based compounds comprise in major proportion, and even more preferably consist essentially of, te ⁇ enes, te ⁇ ene derivatives or combinations of these.
• te ⁇ ene means a compound, which is comprised of at least ten carbon atoms and contains at least one, and preferably at least two isoprene moieties.
• isoprene moiety refers to any portion of a molecule, which includes a radical, which can be formed from substituted or unsubstituted isoprene. In certain preferred embodiments, unsubstituted te ⁇ enes are preferred.
• the te ⁇ ene compound of the present invention comprises at least one head-to-tail condensation product of modified or unmodified isoprene molecules. It is contemplated that any one or more te ⁇ ene compounds are adaptable for use in accordance with the present invention and that those skilled in the art will be able, in view of the teachings contained herein, to select the number and type of te ⁇ ene compound(s) for any particular application without undue experimentation.
• the preferred te ⁇ enes of the present invention are hydrocarbons having molecular formula (C 5 H 8 ) n in a cyclic or acyclic, saturated or unsaturated, substituted or unsubstituted structure, with n preferably being from 2 to about 6, and even more preferably 2 to 4.
• Te ⁇ enes according to the present invention having the formula C ⁇ oH ⁇ 6 (including substituted forms) are sometimes referred to herein as monote ⁇ enes, while te ⁇ enes having the formula Ci 5 H 24 (including substituted forms) are sometimes referred to herein as sesquite ⁇ enes.
• Te ⁇ enes according to the present invention having the formula C 20 H 32 are sometimes referred to herein as dite ⁇ enes, while te ⁇ enes having the formula C 3 oH 4 (including substituted forms) are sometimes referred to as trite ⁇ enes, and so on.
• Te ⁇ enes containing 30 or more carbons are usually formed by the fusion of two te ⁇ ene precursors in a regular pattern. While it is contemplated that all such te ⁇ enes are adaptable for use in accordance with the present invention, the use of monote ⁇ enes is generally preferred.
• the te ⁇ ene compound(s) of present compositions comprise, preferably in major proportion, and even more preferably consist essentially of, one or more acyclic te ⁇ ene compounds.
• acyclic te ⁇ enes it is contemplated that such compounds may be within the class of compounds identified as head-to-tail linked isoprenoids or within the class of compounds that are not joined in that manner.
• Acyclic te ⁇ enes which are preferred for use in accordance with certain aspects of the present invention include myrcene (2-methyl-6-methyleneocta-l,7-diene), allo-cimene, beta- ocimene.
• the te ⁇ ene compounds of the present invention may comprise cyclic te ⁇ ene compounds.
• cyclic te ⁇ enes mono-, bi-, tri-, or tetracyclic compounds having varying degrees of unsaturation are contemplated for use in accordance with the present invention.
• te ⁇ ene derivatives in accordance with the present invention include oxygen-containing derivatives of te ⁇ enes such as alcohols, aldehydes or ketones containing hydroxyl groups or carbonyl groups, as well as hydrogenated derivates.
• the diene-based compounds of the present invention comprise the te ⁇ enoid Carnosic acid.
• Carnosic acid is a phenolic dite ⁇ ene that corresponds to the empirical formula C2028O4. It occurs naturally in plants of the Libiatae family. For instance, carnosic acid is a constituent of the species Salvia officinalis (sage) and Rosmarinus officinalis (rosemary) where it is mainly found in the leaves. Carnosic acid is also found in thyme and marjoram. It was discovered by Linde in Salvia officinalis [Helv.
• the weight ratio of the diene-based compound(s) to other stabilizer compound(s) is in the range of from about 1 :99 to about 100:0.
• the weight ratio of diene-based compound(s) to the optional stabilizers is from about 10:1 to about 1:1, more preferably from about 2: 1 to about 1 : 1, and even more preferably about 1:1.
• Preferred te ⁇ ene stabilizers are disclosed in U.S. Provisional Patent Application No. 60/638,003, filed on December 12, 2004, which is inco ⁇ orated herein by reference. Any of a variety of phenol compounds and/or epoxides is also suitable for use as stabilizers in the present compositions.
• phenol compound refers generally to any substituted or unsubstituted phenol.
• Suitable phenol compounds include phenols comprising one or more substituted or unsubstituted cyclic, straight-chain, or branched aliphatic substituent group, such as, alkylated monophenols including: 2,6-di-tert-butyl-4-methylphenol; 2,6-di- tert-butyl-4-ethylphenol; 2,4-dimethyl-6-tert-butylphenol; tocopherol; and the like, hydroquinone and alkylated hydroquinones including: t-butyl hydroquinone; other derivatives of hydroquinone; and the like, hydroxylated thiodiphenyl ethers including: 4,4'-thiobis (2-methyl-6-tert-butylphenol); 4,4'-thiobis (3 -methyl-6- tert-butylphenol); 2,2'-thiobis (4-methyl-6-tert-butylphenol); and the like, alkylidene-bisphenols including: 4,4'-m
• alpha. -dimethylamino- p-cresol 4,4-thiobis(6-tert-butyl-m-cresol); and the like; acylaminophenols; 2,6- di-tert-butyl-4(N,N'-dimethylaminomethylphenol); sulfides including: bis(3- methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4- hydroxybenzyl)sulfide; and the like; as well as, phenolic UV absorb and light stabilizers. Certain preferred phenols include alkylated monophenols such as tocopherol, BHT, hydroquinones, and the like.
• Certain particularly preferred phenols include tocopherol, and the like. Most phenols are commercially available. A single phenol compound and/or mixtures of two or more phenols may be used in the present compositions. Any of a variety of epoxides are suitable for use in the compositions of the present invention. While applicants do not wish to be bound by or to any theory of operation, it is believed that the epoxides of the present invention act as acid scavengers in the CF 3 I compositions and thereby tend to increase the stability of such compositions. A single aromatic epoxide and/or mixtures of two or more aromatic epoxides may be used in the present compositions. Examples of suitable aromatic epoxides include those defined by the formula I below:
• R is hydrogen, hydroxyl, alkyl, fluoroalkyl, aryl, fluoroaryl, or O / ⁇ — O— CH 2 -CH— CH 2 ;
• Ar is a substituted or unsubstituted phenylene or napthylene moiety.
• Certain preferred aromatic epoxides of Formula I include those wherein Ar is phenylene or phenylene substituted with one or more substituents including alkyls, alkenyls, alkynyls, aryls, alkylaryls, halogens, halogenated alkyls, halogenated alkenyls, halogenated alkynyls, halogenated aryls, halogenated arylalkyls, hydroxyls, heteroatom moieties, and the like.
• Examples of suitable compounds of Formula I wherein Ar is an unsubstituted or substituted phenylene include butylphenylglycidyl ether; pentylphenylglycidyl ether; hexylphenylglycidyl ether; heptylphenylglycidyl ether; octylphenylglycidyl ether; nonylphenylglycidyl ether; decylphenylglycidyl ether; glycidyl methyl phenyl ether; 1,4-diglycidyl phenyl diether; 4-methoxyphenyl glycidyl ether; derivatives thereof; and the like.
• Certain other preferred aromatic epoxides of Formula I include those wherein Ar is napthylene or napthylene substituted with one or more substituents including alkyls, alkenyls, alkynyls, aryls, alkylaryls, halogens, halogenated alkyls, halogenated alkenyls, halogenated alkynyls, halogenated aryls, halogenated arylalkyls, hydroxyls, heteroatom moieties, and the like.
• Examples of suitable compounds of Formula I wherein Ar is an unsubstituted or substituted napthylene include naphthyl glycidyl ether; 1,4-diglycidyl naphthyl diether; derivatives thereof; and the like.
• Examples of other suitable aromatic epoxides include bisoxiranes, such as, 2,2'[[[5-heptadecafluorooctyl]l,3phenylene]bis[[2,2,2trifluoromethyl]ethylidene] oxymethylenejbisoxirane; and the like.
• the aromatic epoxides for use in the present invention comprise an epoxide of Formula I wherein Ar is phenylene, substituted phenylene, napthylene, or substituted napthylene. More preferably, the aromatic epoxides comprise an epoxide of Formula I wherein Ar is phenylene or substituted phenylene. Examples of certain more preferred aromatic epoxides include butylphenyl glycidyl ether, and the like. Any of a variety of alkyl and/or alkenyl epoxides are suitable for use in the present compositions. Examples of suitable alkyl and alkenyl epoxides include those of Formula II: O / ⁇ R a ]k-OCH 2 -CH-CH 2
• R a ik is a substituted or unsubstituted alkyl or alkenyl group.
• Certain preferred epoxides of Formula II comprise alkyl epoxide compounds wherein R a i is an alkyl group having from about 1 to about 10 carbon atoms, more preferably from about 1 to about 6 carbon atoms, and wherein the alkyl may be unsubstituted or further substituted with one or more substituents including alkyls, alkenyls, alkynyls, aryls, alkylaryls, halogens, halogenated alkyls, halogenated alkenyls, halogenated alkynyls, halogenated aryls, halogenated arylalkyls, hydroxyls, heteroatom moieties, and the like.
• alkyl epoxides of Formula II include n-butyl glycidyl ether, isobutyl glycidyl ether, hexanediol diglycidyl ether, and the like, as well as, fluorinated and perfluorinated alkyl epoxides, and the like.
• Certain more preferred alkyl epoxides comprise hexanediol diglycidyl ether, and the like.
• Certain other preferred epoxides of Formula II comprise alkenyl epoxide compounds wherein R a i k is an alkenyl group having from about 1 to about 10 carbon atoms, more preferably from about 1 to about 6 carbon atoms, and wherein the alkenyl may be unsubstituted or further substituted with one or more substituents including alkyls, alkenyls, alkynyls, aryls, alkylaryls, halogens, halogenated alkyls, halogenated alkenyls, halogenated alkynyls, halogenated aryls, halogenated arylalkyls, hydroxyls, heteroatom moieties, and the like.
• alkenyl epoxides of Formula II examples include allyl glycidyl ether, fluorinated and perfluorinated alkenyl epoxides, and the like. More preferred alkenyl epoxides include allyl glycidyl ether, and the like. A single alkyl epoxide or alkenyl epoxide and/or combinations of two or more thereof may be used in the present compositions. In certain other preferred embodiments, the alkyl epoxide for use as an acid scavenger in the present composition comprises polypropylene glycol diglycidyl ether.
• the epoxide for use in the present invention comprises combinations of two or more aromatic, alkyl, and/or alkenyl substituents. Such epoxides are referred to generally as "multisubstituted epoxides.”
• the stabilizer for use in the present invention comprises one or more diene-based compounds, preferably a te ⁇ ene and/or a te ⁇ ene-based compound.
• the stabilizer comprises such diene-based compound(s) in a combination with at least one phosphite compound, and/or at least one phenol compound and/or at least one aromatic, alkyl, or alkenyl epoxide.
• suitable combinations phenols and epoxides include stabilizers comprising: tocopherol and allyl glycidyl ether, BHT and glycidyl butyl ether, and the like.
• Certain particularly preferred combinations include stabilizers comprising: tocopherol and allyl glycidyl ether, and the like.
• the preferred stabilizers comprise at least one diene-based compound in combination with at least one phosphite compound.
• any suitable relative amount of the at least one phenol compound and the at least one aromatic, alkyl, or alkenyl epoxide may be used in the preferred stabilizers.
• the weight ratio of phenol compound(s) to aromatic or fluorinated alkyl epoxide(s) can be varied from about 1:99 to about 99:1.
• the weight ratios of phenol compound(s) to aromatic, alkyl, alkenyl, multisubstituted, or fluorinated alkyl epoxide(s) is from about 30 to about 1, more preferably from about 7 to about 1, more preferably from about 2 to about 1, and even more preferably about 1:1.
• any suitable effective amount of stabilizer may be used in the trifluoroiodomethane compositions of the present invention.
• the term "effective stabilizing amount” refers to an amount of stabilizer of the present invention which, when added to a composition comprising trifluoroiodomethane, results in a stabilized composition wherein the trifluoroiodomethane therein degrades more slowly and/or to a lesser degree relative to the original composition, under the same, or similar, conditions.
• an "effective stabilizing amount" of stabilizer comprises an amount which, when added to a composition comprising trifluoroiodomethane, results in a stabilized composition wherein the trifluoroiodomethane therein degrades more slowly and/or to a lesser degree relative to the original composition under the conditions of at least one, or both, of the standards tests SAE J1662 (issued June 1993) and/or ASHRAE 97-1983R.
• an "effective stabilizing amount" of stabilizer comprises an amount which, when added to a composition comprising trifluoroiodomethane, results in a composition having a stability that is at least as good as, if not better, than the stability of a comparable composition comprising dichlorodifluoromethane (R-12) in mineral oil, under at least one of the standard tests SAE J1662 (issued June 1993) and/or ASHRAE 97-1983R.
• compositions of the present invention further comprise a lubricant.
• a lubricant Any of a variety of conventional and unconventional lubricants may be used in the compositions of the present invention. An important requirement for the lubricant is that, when in use in a refrigerant system, there must be sufficient lubricant returning to the compressor of the system such that the compressor is lubricated.
• suitability of a lubricant for any given system is determined partly by the refrigerant/lubricant characteristics and partly by the characteristics of the system in which it is intended to be used.
• suitable lubricants which are generally those commonly used in refrigeration machinery using or designed to use hydrofluorocarbon (HFC) refrigerants, chlorofluorocarbon refrigerants and hydrochlorofluorocarbons refrigerants, include mineral oil, silicone oil, polyalkyl benzenes (sometimes referred to as PABs), polyol esters (sometimes referred to as POEs), polyalkylene glycols (sometimes referred to as PAGs), polyalkylene glycol esters (sometimes referred to as PAG esters), polyvinyl ethers (sometimes referred to as PVEs), poly(alpha-olefin) (sometimes referred to as PAOs), and halocarbon oils, particularly poly(chlorotrifluorethylene) and the like.
• HFC hydrofluorocarbon
• PABs
• Mineral oil which comprises paraffin oil or naphthenic oil, is commercially available.
• mineral oils include Witco LP 250 (registered trademark) from Witco, Zerol 300 (registered trademark) from Shrieve Chemical, Sunisco 3GS from Witco, and Calumet R015 from Calumet.
• polyalkyl benzene lubricants include Zerol 150 (registered trademark).
• esters include neopentyl glycol dipelargonate which is available as Emery 2917 (registered trademark) and Hatcol 2370 (registered trademark).
• PAGs include Motorcraft PAG Refrigerant Compressor Oil, available from Ford, with similar products being available from Dow.
• PAOs include CP-4600 from CPI Engineering.
• PVEs are available from Idemitsu Kosan.
• PAG esters are available from Chrysler.
• Other useful esters include phosphate esters, dibasic acid esters, and fluoroesters.
• lubricants for refrigeration systems using or designed to use HFCs, it is generally preferred to use as lubricants PAGs, PAG esters, PVEs, and POEs, particularly for systems comprising compression refrigeration, air-conditioning (especially for automotive air conditioning) and heat pumps.
• lubricants mineral oil or PAB For refrigeration systems using or designed to use CFCs or HCFCs, it is generally preferred to use as lubricants mineral oil or PAB.
• the lubricants of this invention are organic compounds which are comprised of carbon, hydrogen and oxygen with a ratio of oxygen to carbon and are included to provide, in combination with the amounts used, effective solubility and/or miscibility with the refrigerant to ensure sufficient return of the lubricant to the compressor.
• This solubility or miscibility preferably exists at least one temperature from about - 30°C and 70°C.
• PAGs and PAG esters are highly preferred in certain embodiments because they are currently in use in particular applications such as original equipment mobile air-conditioning systems.
• Polyol esters are highly preferred in other certain embodiments because they are currently in use in particular non- mobile applications such as residential, commercial, and industrial air conditioning and refrigeration. Of course, different mixtures of different types of lubricants may be used.
• the present compositions have utility in a wide range of applications.
• one embodiment of the present invention relates to heat transfer compositions, such as refrigerant compositions, comprising the present azeotrope- like compositions.
• the heat transfer compositions of the present invention are generally adaptable for use in heat transfer applications, that is, as a heating and/or cooling medium.
• the compositions of the present invention may include the present azeotrope-like composition in combination with one or more other compounds or combinations of compounds in widely ranging amounts, it is generally preferred that heat transfer compositions of the present invention, including refrigerant compositions, consist essentially of, and in some embodiments consist of the present azeotrope-like compositions.
• the heat transfer compositions of the present invention may be used in any of a wide variety of refrigeration systems including air-conditioning (including both stationary and mobile air conditioning systems), refrigeration, heat-pump systems, and the like.
• the compositions of the present invention are used in refrigeration systems originally designed for use with an HFC refrigerant, such as, for example, HFC- 134a, or an HCFC refrigerant, such as, for example, HCFC-22.
• compositions of the present invention tend to exhibit many of the desirable characteristics of HFC- 134a and other commonly used HFC refrigerants, including a GWP that is as low, or lower than that of conventional HFC refrigerants and a capacity that is substantially similar to or substantially matches, and preferably is as high as or higher than such refrigerants.
• a GWP that is as low, or lower than that of conventional HFC refrigerants and a capacity that is substantially similar to or substantially matches, and preferably is as high as or higher than such refrigerants.
• Heat transfer compositions of the present invention are particularly preferred as replacements forHFC-32, HFC-125, HFC-134a, HFC-143a, HFC-152a, HFC-22, R-12 and R-500.
• the present compositions are also believed to be suitable as replacements for the above noted compositions in other applications, such as aerosols, blowing agents and the like.
• the present compositions are used in heat transfer systems in general, and refrigeration systems in particular, originally designed for use with a CFC-refrigerant.
• Preferred refrigeration compositions of the present invention may be used in refrigeration systems containing a lubricant used conventionally with CFC -refrigerants, such as mineral oils, polyalkylbenzene, polyalkylene glycols, and the like, or may be used with other lubricants traditionally used with HFC refrigerants.
• a lubricant used conventionally with CFC -refrigerants, such as mineral oils, polyalkylbenzene, polyalkylene glycols, and the like, or may be used with other lubricants traditionally used with HFC refrigerants.
• refrigeration system refers generally to any system or apparatus, or any part or portion of such a system or apparatus, which employs a refrigerant to provide cooling.
• Such refrigeration systems include, for example, air conditioners, electric refrigerators, chillers (including chillers using centrifugal compressors), transport refrigeration systems, commercial refrigeration systems and the like.
• Many existing refrigeration systems are currently adapted for use in connection with existing refrigerants, and the compositions of the present invention are believed to be adaptable for use in many of such systems, either with or without system modification.
• the compositions of the present invention may provide an advantage as a replacement in smaller systems, which are currently based on certain refrigerants, for example those requiring a small refrigerating capacity and thereby dictating a need for relatively small compressor displacements.
• compositions of the present invention particularly compositions comprising a substantial proportion of, and in some embodiments consisting essentially of the present azeotrope-like compositions, as a replacement for existing refrigerants, such as: HFC-134a; HCFC-12; HCFC-22; HFC-152a; combinations of pentfluoroethane (HFC- 125), trifluorethane (HFC- 143a) and tetrafluoroethane (HFC- 134a) (the combination HFC-125:HFC-143a:HFC134a in approximate 44:52:4 weight ratio is referred to as R-404A); combinations of HFC-32, HFC-125 and HFC-134a (the combination HFC-
• the present compositions may also be beneficial to use the present compositions in connection with the replacement of refrigerants formed from the combination HFC-32:HFC-125:HFC134a in approximate 20:40:40 weight ratio, which is referred to as R-407A, or in approximate 15: 15:70 weight ratio, which is referred to as R-407D.
• the present compositions are also believed to be suitable as replacements for the above noted compositions in other applications, such as aerosols, blowing agents and the like.
• the refrigerants of the present invention potentially permit the beneficial use of larger displacement compressors, thereby resulting in better energy efficiency than other refrigerants, such as HFC-134a.
• the refrigerant compositions of the present invention provide the possibility of achieving a competitive advantage on an energy basis for refrigerant replacement applications. It is contemplated that the compositions of the present also have advantage (either in original systems or when used as a replacement for refrigerants such as CFC-12, HCFC-22, HFC- 134a, HFC-152A, R-500 and R-507A), in chillers typically used in connection with commercial air conditioning and refrigeration systems. In certain of such embodiments it is preferred to including in the present compositions from about 0.5 to about 30%, and in certain cases more preferably from about 0.5 to about 15%, and in certain cases even more preferably from about 0.5 to about 5% on a weight basis of a supplemental flammability suppressant.
• CF 3 I and HFO-1234 component of the present compositions may in certain embodiments act as flammability suppressants with respect to other components in the composition.
• CF 3 I is believed to function to suppress the flammability of HFO-1234yf.
• HF01234-yf and CF 3 I may each function to suppress the flammability of such other component.
• components other than HF01234- yf and CF 3 I which have flammability suppressant functionality in the composition will sometimes be referred to herein as a supplemental flammability suppressant.
• the CF 3 I component of the present compositions may in certain embodiments act as lubricant, and therefore components other than CF3I which have lubrication functionality will sometime be referred to herein as a supplemental lubricants.
• the present methods, systems and compositions are thus adaptable for use in connection with automotive air conditioning systems and devices, commercial refrigeration systems and devices, chillers, including systems which utilize centrifugal compressors, residential refrigerator and freezers, general air conditioning systems, heat pumps, and the like.
• the compositions of the present invention may include other components for the pu ⁇ ose of enhancing or providing certain functionality to the composition, or in some cases to reduce the cost of the composition.
• refrigerant compositions according to the present invention include a supplemental lubricant, generally in amounts of from about 5 to about 50 percent by weight of the composition.
• the present compositions may also include a compatibilizer, such as propane, for the pu ⁇ ose of aiding compatibility and/or solubility of the lubricant.
• a compatibilizer such as propane, for the pu ⁇ ose of aiding compatibility and/or solubility of the lubricant.
• Such compatibilizers including propane, butanes and pentanes, are preferably present in amounts of from about 0.5 to about 5 percent by weight of the composition.
• Combinations of surfactants and solubilizing agents may also be added to the present compositions to aid oil solubility, as disclosed by U.S. Patent No. 6,516,837, the disclosure of which is inco ⁇ orated by reference.
• co-refrigerants including for example HFCs, HCFCs and CFCs may be included in the heat transfer compositions of the present invention, including one or more of the following compounds, including any and all isomers thereof: Trichlorofluoromethane (CFC-11) Dichlorodifluoromethane (CFC-12) Difluoromethane (HFC-32) Pentafluoroethane (HFC-125) 1 , 1 ,2,2-tetrafluoroethane (HFC- 134) 1,1,1 ,2-Tetrafluoroethane (HFC- 134a) Difluoroethane (HFC- 152a) 1,1,1 ,2,3,3,3-Heptafluoro ⁇ ropane (HFC-227ea) 1,1,1 ,3,3,3-hexafluoropropane (HFC-236fa) 1,1,1 ,3 ,3-pentafluoropropane (HFC-245f
• any of the above noted components, as well as any additional components which may be included in present compositions, may be inco ⁇ orated into the present composition in amounts depending on the particular application for the composition, and all such relative amounts are considered to be within the scope hereof, provided preferably that such components do not negate the azeotrope-like nature of the HFO-1234 and CF 3 I described herein.
• Any of a wide range of methods for introducing the present heat transfer compositions to a refrigeration or heating system can be used in the present invention. For example, one method comprises attaching a refrigerant container to the low-pressure side of a refrigeration system and turning on the refrigeration system compressor to pull the refrigerant into the system.
• the refrigerant container may be placed on a scale such that the amount of refrigerant composition entering the system can be monitored. When a desired amount of refrigerant composition has been introduced into the system, charging is stopped.
• a wide range of charging tools known to those of skill in the art, is commercially available. Accordingly, in light of the above disclosure, those of skill in the art will be readily able to introduce the refrigerant compositions of the present invention into refrigeration systems according to the present invention without undue experimentation.
• the present invention provides refrigeration systems comprising a refrigerant of the present invention and methods of producing heating or cooling by sensible heat transfer and/or by condensing and/or evaporating a composition of the present invention.
• the methods for cooling comprise condensing a refrigerant composition comprising an azeotrope-like composition of the present invention and thereafter evaporating said refrigerant composition in the vicinity of the fluid or body to be cooled.
• body is intended to refer not only to inanimate objects but also to living tissue, including animal tissue in general and human tissue in particular.
• certain aspects of the present invention involve application of the present composition to human tissue for one or more therapeutic pu ⁇ oses, such as a pain killing technique, as a preparatory anesthetic, or as part of a therapy involving reducing the temperature of the body being treated.
• the application to the body comprises providing the present compositions in liquid form under pressure, preferably in a pressurized container having a one-way discharge valve and/or nozzle, and releasing the liquid from the pressurized container by spraying or otherwise applying the composition to the body. As the liquid evaporates from the surface being sprayed, the surface cools.
• Certain preferred methods for heating a fluid or body comprise condensing a refrigerant composition comprising an azeotrope-like composition of the present invention in the vicinity of the fluid or body to be heated and thereafter evaporating said refrigerant composition.
• the azeotrope-like compositions of this invention may be used as propellants in sprayable compositions, either alone or in combination with known propellants.
• the propellant composition comprises, more preferably consists essentially of, and, even more preferably, consists of the azeotrope-like compositions of the invention.
• the active ingredient to be sprayed together with inert ingredients, solvents, and other materials may also be present in the sprayable mixture.
• the sprayable composition is an aerosol. Suitable active materials to be sprayed include, without limitation, cosmetic materials such as deodorants, perfumes, hair sprays, cleaning solvents, and lubricants, as well as medicinal materials such as anti-asthma and other medications.
• a blowing agent comprising one or more azeotrope-like compositions of the invention.
• the blowing agent may include the azeotrope-like compositions of the present invention in widely ranging amounts. It is generally preferred, however, that the blowing agents comprise the present azeotrope-like compositions in amounts at least about 5 % by weight, and even more preferably at least about 15 % by weight, of the blowing agent.
• the blowing agent comprises at least about 50% by weight of the present compositions, and in certain embodiments the blowing agent consists essentially of or consists of the present azeotrope - like compositions.
• the blowing agent includes, in addition to the present compositions, one or more of co-blowing agents, fillers, vapor pressure modifiers, flame suppressants, stabilizers and like adjuvants.
• the invention provides foamable compositions.
• the foamable compositions of the present invention generally include one or more components capable of forming foam having a generally cellular structure and a blowing agent in accordance with the present invention.
• the one or more components comprise a thermosetting composition capable of forming foam and/or foamable compositions.
• thermosetting compositions include polyurethane and polyisocyanurate foam compositions, and also phenolic foam compositions.
• one or more of the present compositions are included as or part of a blowing agent in a foamable composition, or as a part of a two or more part foamable composition, which preferably includes one or more of the components capable of reacting and/or foaming under the proper conditions to form a foam or cellular structure.
• the one or more components comprise thermoplastic materials, particularly thermoplastic polymers and/or resins.
• thermoplastic foam components include polyolefins, such as polystyrene (PS), polyethylene (PE), polypropylene (PP) and polyethyleneterepthalate (PET), and foams formed therefrom, preferably low- density foams.
• the thermoplastic foamable composition is an extrudable composition. It will be appreciated by those skilled in the art, especially in view of the disclosure contained herein, that the order and manner in which the blowing agent of the present invention is formed and/or added to the foamable composition does not generally affect the operability of the present invention.
• the various components of the blowing agent, and even the components of the present composition be not mixed in advance of introduction to the extrusion equipment, or even that the components are not added to the same location in the extrusion equipment.
• blowing agent two or more components of the blowing agent are combined in advance and introduced together into the foamable composition, either directly or as part of premix which is then further added to other parts of the foamable composition.
• the invention also relates to foam, and preferably closed cell foam, prepared from a polymer foam formulation containing a composition of the invention, preferably as part of blowing agent.
• dispersing agents, cell stabilizers, surfactants and other additives may also be inco ⁇ orated into the blowing agent compositions of the present invention.
• Surfactants are optionally but preferably added to serve as cell stabilizers.
• DC- 193, B-8404, and L-5340 are, generally, polysiloxane polyoxyalkylene block co-polymers such as those disclosed in U.S. Patent Nos. 2,834,748, 2,917,480, and 2,846,458, each of which is inco ⁇ orated herein by reference.
• blowing agent mixture may include flame retardants or suppressants such as tri(2-chloroethyl)phosphate, tri(2- chloropropyl)phosphate, tri(2,3-dibromopropyl)-phosphate, tri(l ,3- dichloropropyl) phosphate, diammonium phosphate, various halogenated aromatic compounds, antimony oxide, aluminum trihydrate, polyvinyl chloride, and the like.
• flame retardants or suppressants such as tri(2-chloroethyl)phosphate, tri(2- chloropropyl)phosphate, tri(2,3-dibromopropyl)-phosphate, tri(l ,3- dichloropropyl) phosphate, diammonium phosphate, various halogenated aromatic compounds, antimony oxide, aluminum trihydrate, polyvinyl chloride, and the like.
• Example 1 An ebulliometer consisting of vacuum jacketed tube with a condenser on top which is further equipped with a Quartz Thermometer K96S4771 is used. About 18 g HFO-1234yf is charged to the ebulliometer and then CF 3 I is added in small, measured increments. Temperature depression is observed when CF 3 I is added to HFO-1234yf, indicating a binary minimum boiling azeotrope is formed. From greater than about 0 to about 75 weight percent CF 3 I, the boiling point of the composition changed by about 2°C or less. The binary mixtures shown in Table 1 were studied and the boiling point of the compositions changed by about 2°C or less. The compositions exhibit azeotrope and/or azeotrope-like properties over this range.
• Example 2 The coefficient of performance (COP) is a universally accepted measure of refrigerant performance, especially useful in representing the relative thermodynamic efficiency of a refrigerant in a specific heating or cooling cycle involving evaporation or condensation of the refrigerant. In refrigeration engineering, this term expresses the ratio of useful refrigeration to the energy applied by the compressor in compressing the vapor.
• the capacity of a refrigerant represents the amount of cooling or heating it provides and provides some measure of the capability of a compressor to pump quantities of heat for a given volumetric flow rate of refrigerant. In other words, given a specific compressor, a refrigerant with a higher capacity will deliver more cooling or heating power.
• a refrigeration /air conditioning cycle system is provided with a specified condenser temperature (CT) and evaporator temperature (ET) under nominally isentropic compression with a specified compressor inlet temperature.
• CT condenser temperature
• ET evaporator temperature
• COP is determined for a composition of the present invention comprising 75% by weight of HFO-1234yf and 25% by weight of CF 3 I over a series of condenser and evaporator temperatures as reported in Table 2 below, based upon HFC- 134a having a COP value of 1.00, a capacity value of 1.00 and a discharge temperature of 175°F.
• This example illustrates the excellent performance of the present compositions as replacements for HFC- 134a in four categories of refrigerant systems.
• the first system is one have an evaporator temperature (ET) of about 20°F and condenser temperature (CT) of about 130°F (Example 2A).
• such heat transfer systems that is, systems having an ET of from about 0°F to about 35°F and a CT of from about 80°F to about 130°F
• the second system is one have an ET of about -10°F and a CT of about 110°F (Example 2B).
• such heat transfer systems that is, systems having an evaporator temperature of from about -20°F to about 20°F and a CT of from about 80°F to about 130°F, are referred to herein as "refrig/freezer" systems.
• the third system is one have an ET of about of 35°F and a CT of about 150°F (Example 2C).
• heat transfer systems that is, systems having an evaporator temperature of from about 30°F to about 60°F and a CT of from about 90°F to about 200°F, are referred to herein as "automotive AC" systems.
• the fourth system is one have an ET of about of 40°F and a CT of about 95 °F (Example 2D).
• the present invention provides retrofitting methods which comprise replacing the refrigerant in an existing system with a composition of the present invention, without substantial modification of the system.
• the replacement step is a drop-in replacement in the sense that no substantial redesign of the system is required and no major item of equipment needs to be replaced in order to accommodate the refrigerant of the present invention.
• the methods comprise a drop-in replacement in which the capacity of the system is at least about 70%, preferably at least about 85%, and even more preferably at least about 90% of the system capacity prior to replacement.
• the methods comprise a drop-in replacement in which the suction pressure and/or the discharge pressure of the system, and even more preferably both, is/are at least about 70%, more preferably at least about 90% and even more preferably at least about 95% of the system capacity prior to replacement.
• the methods comprise a drop-in replacement in which the mass flow of the system is at least about 80%, and even more preferably at least 90% of the system capacity prior to replacement.

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