WO2014178353A1 - 熱サイクル用作動媒体 - Google Patents
熱サイクル用作動媒体 Download PDFInfo
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- WO2014178353A1 WO2014178353A1 PCT/JP2014/061767 JP2014061767W WO2014178353A1 WO 2014178353 A1 WO2014178353 A1 WO 2014178353A1 JP 2014061767 W JP2014061767 W JP 2014061767W WO 2014178353 A1 WO2014178353 A1 WO 2014178353A1
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- 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
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- 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
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- 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
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- 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
- C09K2205/22—All components of a mixture being fluoro compounds
Definitions
- the present invention relates to a working medium for heat cycle.
- CFC chlorofluorocarbons
- HCFC hydrochlorofluorocarbons
- CFCs and HCFCs have been pointed out as being affected by the stratospheric ozone layer and are now subject to regulation.
- CFCs and HCFCs have been pointed out as being affected by the stratospheric ozone layer and are now subject to regulation.
- the abbreviation of the compound is described in parentheses after the compound name, but in this specification, the abbreviation is used instead of the compound name as necessary.
- HFC-32 difluoromethane
- HFC-134 tetrafluoroethane
- HFC- 125 pentafluoroethane
- R410A a pseudo-azeotropic refrigerant mixture having a mass ratio of 1: 1 between HFC-32 and HFC-125
- GWP global warming potential
- HFOs hydrofluoroolefins
- Patent Document 1 proposes a composition containing trifluoroethylene (HFO-1123).
- HFO-1123 is used in combination with various HFCs and HFOs for the purpose of enhancing the nonflammability and cycle performance of the working medium.
- HFO-1123 is produced by various methods, and impurities are present in the product in any production method.
- HFO-1123 containing such impurities hereinafter also referred to as crude HFO-1123
- a working medium having excellent cycle performance may not be obtained.
- An object of the present invention is to provide a working medium for heat cycle that has little influence on the ozone layer, little influence on global warming, and excellent cycle performance and high productivity.
- the present invention has been made to simplify the process of reducing impurities from the crude HFO-1123.
- working media that can solve the above problems include working media that contain HFO-1123 and HFC-32 and have a low difluoroethylene content, and HFO-1123 and 2,3,3,3-tetrafluoropropene ( HFO-1234yf) and a low difluoroethylene content have also been found.
- the present invention provides a working medium for heat cycle, which contains HFO-1123 and difluoroethylene, and the ratio of the difluoroethylene to the total amount of the working medium is less than 1.5% by mass. Further, the present invention is a working medium for heat cycle containing trifluoroethylene, difluoroethylene and difluoromethane, wherein the ratio of the difluoroethylene to the total amount of the working medium is less than 1.5% by mass, and the total amount of the working medium The ratio of the total amount of the said trifluoroethylene and the said difluoromethane with respect to is 80 mass% or more, The working medium for thermal cycles characterized by the above-mentioned is provided.
- the present invention provides a working medium for heat cycle containing trifluoroethylene, difluoroethylene, and 2,3,3,3-tetrafluoropropene, wherein the ratio of the difluoroethylene to the total amount of the working medium is 1.5 mass. And a ratio of the total amount of the trifluoroethylene and the 2,3,3,3-tetrafluoropropene to the total amount of the working medium is 70% by mass or more. provide. Furthermore, the present invention also provides a working medium for heat cycle comprising trifluoroethylene, difluoroethylene, difluoromethane, and 2,3,3,3-tetrafluoropropene, wherein the difluoroethylene is used with respect to the total amount of the working medium. A working medium for heat cycle, characterized in that the ratio is less than 1.5% by mass.
- the working medium for heat cycle of the present invention (hereinafter also referred to as working medium) has little influence on the ozone layer and little influence on global warming.
- the content of difluoroethylene present as an impurity in the production of HFO-1123 is adjusted to less than 1.5% by mass with respect to the total amount of the working medium, the working medium for heat cycle having excellent cycle performance Is obtained.
- FIG. 2 is a cycle diagram in which a change in state of a working medium in the refrigeration cycle system of FIG. 1 is described on a pressure-enthalpy diagram.
- the working medium of the embodiment of the present invention contains HFO-1123 and difluoroethylene, and the ratio of difluoroethylene to the total amount of the working medium is less than 1.5% by mass.
- the working medium of the embodiment may further contain a compound described later in addition to HFO-1123 and difluoroethylene.
- HFO-1123 has a low global warming potential (GWP), has little impact on the ozone layer, and has little impact on global warming. Further, HFO-1123 is excellent in performance as a working medium, and particularly excellent in cycle performance (for example, a coefficient of performance and a refrigerating capacity required by a method described later).
- the content of HFO-1123 is preferably 20% by mass or more, more preferably 30% by mass or more, and further preferably 40% by mass or more with respect to the total amount (100% by mass) of the working medium from the viewpoint of cycle performance.
- HFO-1123 has a so-called self-decomposition property that causes a decomposition reaction when used alone when an ignition source is present at a high temperature or high pressure.
- the content of HFO-1123 is preferably 80% by mass or less, more preferably 70% by mass or less, and more preferably 60% by mass or less, based on the total amount of the working medium. Is most preferred.
- the self-decomposition reaction can be suppressed by mixing HFO-1123 with HFC-32 or the like to be described later to suppress the content of HFO-1123.
- the content ratio of HFO-1123 is 80% by mass or less, since it does not have self-decomposability under temperature and pressure conditions when applied to a heat cycle system, a highly safe working medium can be obtained.
- Difluoroethylene is a compound that is by-produced in the production of HFO-1123 and is present in the product composition as an impurity.
- difluoroethylene include 1,1-difluoroethylene (HFO-1132a) and E- and / or Z-1,2-difluoroethylene (HFO-1132).
- E- and / or Z- means a mixture of E-form and Z-form, and is also indicated as E / Z-.
- the amount of difluoroethylene in the present invention means the total amount of HFO-1132a and HFO-1132, but as a working medium of the present invention, it is easily produced as a by-product particularly in the production of HFO-1123. It is preferable that the amount of HFO-1132a that remains easily is small.
- the cycle performance is low.
- the content of difluoroethylene is less than 1.5% by mass with respect to the total amount of the working medium, a working medium having sufficiently excellent cycle performance can be obtained.
- the content of difluoroethylene is preferably 4 ppm or more, more preferably 50 ppm or more, and most preferably 100 ppm or more with respect to the total amount of the working medium. If the content is 4 ppm or more, there is an advantage that the process of purifying crude HFO-1123 and reducing difluoroethylene as an impurity can be simplified.
- the working medium of the present invention may further contain hydrofluorocarbon (HFC) and other hydrofluoroolefins (HFO) in addition to HFO-1123 and difluoroethylene.
- HFC hydrofluorocarbon
- HFO hydrofluoroolefins
- HFC-32 difluoromethane
- HFC-152a 1,1-difluoroethane
- HFC 1,1,1-trifluoroethane
- HFC-134 1,1,2,2-tetrafluoroethane
- HFC-134a 1,1,1,2-tetrafluoroethane
- pentafluoroethane HFC-125.
- HFCs may be used alone or in combination of two or more.
- HFC-32 is particularly preferable.
- HFOs are 2,3,3,3-tetrafluoropropene (HFO-1234yf), 2-fluoropropene (HFO-1261yf), 1,1 because they have little influence on the ozone layer and have excellent cycle characteristics.
- 2-trifluoropropene (HFO-1243yc) trans-1,2,3,3,3-pentafluoropropene (HFO-1225ye (E)), cis-1,2,3,3,3-pentafluoro Propene (HFO-1225ye (Z)), trans-1,3,3,3-tetrafluoropropene (HFO-1234ze (E)), cis-1,3,3,3-tetrafluoropropene (HFO-1234ze ( Z)), 3,3,3-trifluoropropene (HFO-1243zf) and the like.
- HFCs may be used alone or in combination of two or more.
- HFO-1234yf, HFO-1234ze (E), and HFO-1234ze (Z) are preferable, and HFO-1234yf is particularly preferable because of having a high critical temperature and excellent safety and cycle performance.
- HFC-32 When the working medium of the present invention contains HFC-32, the ratio of each content of HFO-1123 and HFC-32 is set so that the total of HFO-1123 and HFC-32 is 100% by mass, and HFO-1123 is 10%.
- HFC-32 is preferably 90 to 1 mass%
- HFO-1123 is preferably 20 to 99 mass%
- HFC-32 is more preferably 80 to 1 mass%
- HFO-1123 is 25 to 99 mass%
- 75 to 1% by mass of HFC-32 is particularly preferable.
- a composition in which the content ratio of HFO-1123 is 90% by mass and the content ratio of HFC-32 is 10% by mass has a very small difference in the composition ratio between the gas and liquid phases and becomes an azeotropic composition. So it has excellent stability.
- the total amount of HFO-1123 and HFC-32 is preferably 60% by mass or more, and more preferably 70% by mass or more with respect to the total amount of the working medium.
- the content of HFO-1123 is preferably 20% by mass or more and more preferably 40% by mass or more with respect to the total amount of the working medium.
- the ratio of the content of HFO-1123 to the total amount of HFO-1123 and HFO-1234yf is preferably 35 to 95% by mass, more preferably 40 to 95% by mass. Preferably, it is more preferably 50 to 90% by mass, still more preferably 50 to 85% by mass, and most preferably 60 to 85% by mass.
- the ratio of the total amount of HFO-1123 and HFO-1234yf to the total amount of working medium is preferably 70% by mass or more. 80 mass% or more is more preferable, 90 mass% or more is further more preferable, and 95 mass% or more is especially preferable.
- the content of HFO-1123 is preferably 20% by mass or more and more preferably 40% by mass or more with respect to the total amount of the working medium.
- the total amount of HFO-1123 and HFO-1234yf is within the above range, good cycle performance can be obtained by increasing the efficiency while maintaining a certain capacity when used for thermal cycling.
- the working medium of the present invention contains both HFC-32 and HFO-1234yf
- the total amount of HFO-1123, HFC-32, and HFO-1234yf exceeds 90% by mass with respect to the total amount of the working medium.
- the ratio of HFO-1123 to the total amount of HFO-1123, HFC-32, and HFO-1234yf is 20 mass% or more and less than 70 mass%, and the ratio of HFC-32 is 30 mass% or more and 75 mass% or less.
- the ratio of HFO-1234yf is preferably 50% by mass or less.
- the ratio of HFO-1234yf is more preferably 40% by mass or less, and most preferably 30% by mass.
- the working medium of the present invention may contain other components in addition to HFO-1123, HFC-32, HFO-1234yf and difluoroethylene.
- the content of other components is preferably less than 1.5% by mass, more preferably 1.4% by mass or less in terms of the total amount of difluoroethylene and other components, with the total amount of the working medium being 100% by mass.
- the other components are impurities (impurities in the raw materials, intermediate products, by-products, etc.) contained in the composition produced during the production of HFO-1123 (for example, the outlet gas from the reactor; the same applies hereinafter). The same applies hereinafter), impurities contained in the composition produced during the production of HFC-32, and impurities contained in the composition produced during the production of HFO-1234yf.
- Table 1 and Table 2 show the abbreviations, chemical formulas and names of the other component compounds. Tables 1 and 2 also show abbreviations, chemical formulas and names of HFO-1123, difluoroethylene (HFO-1132a and HFO-1132), HFC-32 and HFO-1234yf.
- HFO-1123 examples include (I) hydrogen reduction of chlorotrifluoroethylene (CTFE) (CFO-1113), and (II) chlorodifluoromethane (HCFC-22) and chlorofluoromethane (HCFC-). There are three methods: synthesis involving thermal decomposition with 31) and (III) catalytic reaction of 1,1,1,2-tetrafluoroethane (HFC-134a) with a solid reactant.
- CFE chlorotrifluoroethylene
- HCFC-22 chlorodifluoromethane
- HCFC- chlorofluoromethane
- the ratio of CFO-1113 and hydrogen in the raw material composition is in the range of 0.01 to 4.0 moles of hydrogen per mole of CFO-1113.
- the pressure in the reactor is preferably normal pressure from the viewpoint of handleability.
- a palladium catalyst is preferable, and the palladium catalyst is used by being supported on a carrier such as activated carbon.
- the temperature of the catalyst layer is set to a temperature equal to or higher than the dew point of the raw material composition (mixed gas) containing CFO-1113 and hydrogen. A range of 220 ° C to 240 ° C is preferred.
- the contact time between the raw material compound CFO-1113 and the catalyst is preferably 4 to 60 seconds.
- a composition containing HFO-1123 can be obtained as the outlet gas of the reactor.
- compounds other than HFO-1123 contained in the outlet gas in addition to unreacted raw material CFO-1113, HFO-1132, HFO-1132a, HCFO-1122, HCFO-1122a, HFC-143, methane, HFC -152a, HCFC-142, HCFC-142b, HCFC-133, HCFC-133b, HCFC-123a, CFC-113, and CFO-1112.
- the raw material composition may be introduced into the reactor at room temperature, but may be introduced into the reactor after being heated in advance in order to increase the reactivity in the reactor.
- the temperature of HCFC-31 supplied to the reactor is preferably 0 to 600 ° C., and the temperature of HCFC-22 is preferably normal temperature (25 ° C.) or higher and 600 ° C. or lower.
- the heat medium is a medium in which thermal decomposition does not occur at the temperature in the reactor, and it is preferable to use a gas containing 50% by volume or more of water vapor and the balance being nitrogen and / or carbon dioxide.
- the supply amount of the heat medium is preferably 20 to 98% by volume with respect to the total supply amount of the heat medium and the raw material composition.
- the contact time of the heat medium and the raw material composition in the reactor is preferably 0.01 to 10 seconds, and the pressure in the reactor is preferably 0 to 2.0 MPa in terms of gauge pressure.
- a composition containing HFO-1123 can be obtained as the outlet gas of the reactor.
- compounds other than HFO-1123 contained in the outlet gas in addition to HCFC-22 and HCFC-31 which are unreacted raw materials, HFO-1132, HFO-1132a, HFO-1141, CFO-1113, HCFO-1122 , HCFO-1122a, HFC-143, FO-1114, HCFO-1131, HFO-1252zf, HFO-1243zf, HFO-1234yf, HFO-1234ze, FO-1216, HFC-125, HFC-134, HFC-134a, HFC -143a, HCFC-124, HCFC-124a, HFC-227ca, HFC-227ea, HFC-236fa, HFC-236ea, CFC-12, HFC-23, HFC-32, HFC-41, HCC-40, RC-318 And Emissions, and the
- the content of HFC-134a in the raw material gas (100 mol%) is preferably 5 to 100 mol%.
- the temperature in the reactor is preferably 200 to 500 ° C., and the pressure is preferably 0 to 2 MPa as a gauge pressure.
- a raw material containing HFC-134a in a layer of the solid reactant using a particulate solid reactant for example, potassium carbonate and / or calcium oxide
- a particulate solid reactant for example, potassium carbonate and / or calcium oxide
- the temperature at which HFC-134a is contacted with the solid reactant is preferably in the range of 100 ° C to 500 ° C.
- a composition containing HFO-1123 can be obtained as the outlet gas of the reactor.
- Compounds other than HFO-1123 and unreacted raw material component (HFC-134a) contained in the outlet gas include hydrogen fluoride, E / Z-HFO-1132, HFO-1132a, HFC-143, HFC-143a, Methane, ethane, ethylene, propane, propylene, butane, isobutane, 1-normal butene, 2-normal butene, isobutene, HFO-1141, HFO-1252zf, HFO-1243zf, HFO-1234yf, E / Z-HFO-1234ze, FO-1216, HFC-125, HFC-134, HFC-143a, HFC-227ca, HFC-227ea, HFC-236fa, HFC-236ea, HFC-32, HFC-23, and HFC-41.
- the difluoroethylene compound HFO-132a and / or HFO-132
- various compounds are used as the outlet gas from the reactor.
- an impurity in the product composition A compound obtained by removing the difluoroethylene compound, HFC-32 and HFO-1234yf from these impurities is the first compound described above.
- HFC-32 ⁇ Manufacture of HFC-32>
- dichloromethane (HCC-30) and hydrogen fluoride are mixed with an aluminum fluoride catalyst, a catalyst in which aluminum fluoride is mixed with a support, or chromium fluoride is supported on a support.
- An example is a method in which a gas phase reaction is performed at a temperature of 200 to 500 ° C. using a catalyst.
- HFC-31 is contained in the outlet gas of the reactor together with the target HFO-32. Unreacted HCC-30 is also contained.
- a fluorination catalyst such as HCC-30 and hydrogen fluoride, a mixture of antimony pentafluoride and antimony trifluoride, or a predetermined concentration of antimony pentafluoride.
- a liquid phase temperature of 80 to 150 ° C., pressure of 8 to 80 kg / cm 2 .
- HFC-31, HFC-23, and HCC-40 are generated as impurities in addition to HFC-32.
- HCC-30, HFC-31, HFC-23, and HCC-40 are generated as impurities. These impurities are the first compound described above.
- HFO-1234yf As a method for producing HFO-1234yf, (i) a method using an isomer mixture of dichloropentafluoropropane (HCFC-225) (method 225), (ii) hexafluoropropene (FO-1216) is used as a starting compound. Method (HFP method), (iii) Method using 1,1,2,3-tetrachloropropene (HCC-1230) as a starting material (TCP method), (iv) Thermal decomposition of the raw material composition in the presence of a heating medium And the like.
- HFO-1234yf is produced using an isomer mixture of HCFC-225.
- 1,1-dichloro-2,2,3,3,3-pentafluoropropane (HCFC-225ca) in the raw material is selectively defluorinated according to the reaction pathway shown in [Chemical Formula 4] below. Hydrogenation produces 1,1-dichloro-2,3,3,3-tetrafluoropropene (CFO-1214ya), and the resulting CFO-1214ya is reduced to produce HFO-1234yf.
- the following compounds may be mentioned as impurities obtained together with HFO-1234yf. That is, examples of the impurities contained in the raw material include HCFC-225ca and its isomers HCFC-225cb and HCFC-225aa. Examples of intermediate products include CFO-1214ya, HCFO-1224yd, and the like. Further, as a by-product, HFC-254eb, which is a reduced form of HCFC-225ca, and HFO-1225zc and HFO-1243zf, which are hyperreduced forms of HFO-1234yf, obtained by reduction after HCFC-225aa is dehydrochlorinated. , HFO-1252zf and the like.
- HFO-1234yf is produced by the reaction route shown in the following [Chemical Formula 5].
- examples of impurities obtained together with HFO-1234yf include FO-1216, HFO-1225ye, and HFO-1234ze.
- HFO-1234yf can be produced by the reaction route shown in the following [Chemical Formula 6] using 1,2,3-trichloropropane as a raw material compound.
- HFC-245cb becomes an organic impurity.
- HFO-1234yf is produced. That is, according to the reaction route shown in the following [Chemical Formula 7], HCC-1230 is fluorinated with hydrogen fluoride to 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), and then this HCFO -1233xf is reacted with hydrogen fluoride to give 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb), and HCFC-244bb is dehydrohalogenated to produce HFO-1234yf.
- HCFO-1233xf, HCFC-244bb, HFO-1234ze, HFO-1243zf, 1,1,1,2,3-pentafluoropropane (HFC-245eb) and the like are generated as impurities.
- the raw material composition a compound that can be decomposed by contact with a heat medium in a reactor to generate difluorocarbene (F 2 C :), and chloromethane or methane are mixed and used. Specifically, a raw material composition containing the following compounds (iv-1) to (iv-6) is used. In addition to the HFO-1234yf and unreacted raw material components, the compounds shown in the respective items are obtained as components (impurities) of the outlet gas from the reactor.
- HFO-1234yf and HFO-1132a and unreacted raw material components contained in the outlet gas of the reactor include methane, ethylene, FO-1114, FO-1216, CFO-1113, HFO-1123, RC- 318, HFO-1234ze), HFO-1132, and the like.
- HCFC-22, HCC-40 and FO-1114 HCFC-22, HCC-40, and FO-1114 are premixed or separately supplied to the reactor, retained in the reactor for a predetermined time, a heat medium is supplied to the reactor, and a raw material is supplied in the reactor. The composition and the heat medium are brought into contact. Then, HFO-1234yf and HFO-1132a are generated by a synthesis reaction involving thermal decomposition.
- the temperature in the reactor is set to 400 to 1200 ° C.
- the main reaction in the reactor is shown in the following [Chemical 9].
- HFO-1234yf and HFO-1132a are produced from a raw material composition containing R318 and HCC-40 in the presence of a heat medium by a synthesis reaction involving thermal decomposition.
- Compounds other than HFO-1234yf and HFO-1132a and unreacted raw material components contained in the outlet gas of the reactor include methane, ethylene, HFC-22, FO-1114, FO-1216, CFO-1113, HFO- 1123, HFO-1234ze, HFO-1132, and the like.
- HFO-1234yf and HFO-1132a are produced from a raw material composition containing FO-1216 and HCC-40 in the presence of a heat medium by a synthetic reaction involving thermal decomposition.
- Compounds other than HFO-1234yf and HFO-1132a and unreacted raw material components contained in the outlet gas of the reactor include methane, ethylene, HFC-22, HFC-23, FO-1114, FO-1216, CFO- 1113, RC318, HFO-1123, HFO-1234ze, HFO-1132, and the like.
- HFO-1234yf is synthesized from a raw material composition containing HFC-22 and / or FO-1114 and methane by a synthesis reaction involving thermal decomposition. And HFO-1132a are manufactured.
- compounds other than HFO-1234yf and HFO-1132a and unreacted raw material components contained in the outlet gas of the reactor methane, ethylene, FO-1114, FO-1216, CFO-1113, RC318, HFO-1123, HFO-1243zf etc. are mentioned.
- HFO-1234yf is produced from a raw material composition containing FO-1114 and HCC-40 in the presence of a heat medium by a synthesis reaction involving thermal decomposition.
- the temperature in the reactor to which the raw material composition and the heat medium are supplied is 400 to 870 ° C.
- compounds other than HFO-1234yf and unreacted raw material components contained in the reactor outlet gas include methane, ethylene, FO-1216, CFO-1113, RC318, HFO-1132a, HFO-1123, HFO-1243zf, etc. Is mentioned.
- the productivity as the working medium is high.
- the working medium of the present invention has little influence on the ozone layer and little influence on global warming, and has excellent cycle performance, and is useful as a working medium for a heat cycle system.
- Specific examples of the heat cycle system include refrigeration / refrigeration equipment, air conditioning equipment, power generation systems, heat transport devices, secondary coolers, and the like.
- the air conditioner include room air conditioners, packaged air conditioners (store packaged air conditioners, building packaged air conditioners, facility packaged air conditioners, etc.), gas engine heat pumps, train air conditioners, automobile air conditioners, and the like.
- Specific examples of the refrigeration / refrigeration equipment include showcases (built-in showcases, separate showcases, etc.), commercial freezers / refrigerators, vending machines, ice makers, and the like.
- the working medium is heated by geothermal energy, solar heat, waste heat in the middle to high temperature range of about 50 to 200 ° C in the evaporator, and the working medium turned into high-temperature and high-pressure steam is expanded.
- An example is a system in which power is generated by adiabatic expansion by a machine, and a generator is driven by work generated by the adiabatic expansion.
- a latent heat transport device is preferable.
- the latent heat transport device include a heat pipe and a two-phase sealed thermosyphon device that transport latent heat using phenomena such as evaporation, boiling, and condensation of a working medium enclosed in the device.
- the heat pipe is applied to a relatively small cooling device such as a cooling device for a heat generating part of a semiconductor element or an electronic device. Since the two-phase closed thermosyphon does not require a wig and has a simple structure, it is widely used for a gas-gas heat exchanger, for promoting snow melting on roads, and for preventing freezing.
- Examples 1 to 3, 5, 7, and 9 are examples, and examples 4, 6, 8, and 10 are comparative examples.
- Examples 1 to 10 A working medium containing HFO-1123 and HFC-32 and / or HFO-1234yf in the ratio shown in Table 3 and containing HFO-1132a in the ratio shown in the same table was manufactured. And about these working media, the refrigerating cycle performance (henceforth refrigeration capacity Q) was measured with the following method.
- the refrigeration capacity Q means the ability to freeze the load fluid, and the higher the Q, the more work can be done in the same system. In other words, a large Q indicates that the target performance can be obtained with a small amount of working medium, and the system can be miniaturized.
- the refrigeration capacity Q is measured by applying a working medium to the refrigeration cycle system 10 shown in FIG. 1, and the thermal cycle shown in FIG. 2, that is, adiabatic compression by the compressor 11 in the AB process, and isobaric pressure by the condenser 12 in the BC process. This was performed for cooling, isoenthalpy expansion by the expansion valve 13 during the CD process, and isobaric heating by the evaporator 14 during the DA process.
- a refrigeration cycle system 10 shown in FIG. 1 includes a compressor 11 that compresses a working medium (steam), a condenser 12 that cools the steam of the working medium discharged from the compressor 11 to form a liquid, and a condenser 12.
- the expansion valve 13 that expands the working medium (liquid) discharged from the gas generator and the evaporator 14 that heats the liquid working medium discharged from the expansion valve 13 to vapor are provided.
- the temperature of the working medium rises from the inlet to the outlet of the evaporator 14 during evaporation, and conversely decreases during condensation from the inlet to the outlet of the condenser 12.
- the evaporator 14 and the condenser 12 are configured by exchanging heat with a heat source fluid such as water or air that flows facing the working medium.
- the heat source fluid is indicated by “E ⁇ E ′” in the evaporator 14 and “F ⁇ F ′” in the condenser 12 in the refrigeration cycle system 10.
- the measurement conditions are: the average evaporating temperature of the working medium in the evaporator 14 is 0 ° C., the average condensing temperature of the working medium in the condenser 12 is 40 ° C., and the degree of supercooling (SC) of the working medium in the condenser 12 is 5 ° C.
- the superheat degree (SH) of the working medium in the vessel 14 was set to 5 ° C.
- fluorine-based brine (Asahi Clin AE-3000: manufactured by Asahi Glass Co., Ltd.) is used as the heat source fluid, and the refrigeration capacity Q of the working medium is determined from the temperature and flow rate of the heat source fluid before and after heat exchange in the evaporator 14. Asked.
- Table 3 shows the evaluation results of the refrigerating capacity Q.
- the refrigeration capacity Q is 1 when the content of HFO-1132a in each working medium composition is 0 ppm
- the relative capacity value is 1 or more, ⁇ (excellent), 0.9 to 1 or more Is evaluated as ⁇ (good), 0.7 to 0.9 is evaluated as ⁇ (slightly poor), and less than 0.7 is evaluated as x (defective).
- the working medium for heat cycle of the present invention includes refrigeration / refrigeration equipment (built-in showcase, separate-type showcase, commercial refrigeration / refrigerator, vending machine, ice maker, etc.), air conditioning equipment (room air conditioner, store packaged air conditioner). , Building packaged air conditioners, facility packaged air conditioners, gas engine heat pumps, train air conditioners, automotive air conditioners, etc.), power generation systems (waste heat recovery power generation, etc.), heat transport devices (heat pipes, etc.) .
- refrigeration / refrigeration equipment built-in showcase, separate-type showcase, commercial refrigeration / refrigerator, vending machine, ice maker, etc.
- air conditioning equipment room air conditioner, store packaged air conditioner.
- power generation systems waste heat recovery power generation, etc.
- heat transport devices heat pipes, etc.
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Abstract
Description
なお、本明細書において、ハロゲン化炭化水素については、化合物名の後の括弧内にその化合物の略称を記すが、本明細書では必要に応じて化合物名に代えてその略称を用いる。
HFO-1123は各種の方法により製造されるが、どの製造方法を採る場合にも、生成物中に不純物が存在する。そして、このような不純物を含むHFO-1123(以下、粗HFO-1123ともいう。)をそのまま用いた場合には、サイクル性能に優れる作動媒体が得られない場合があった。
また本発明は、トリフルオロエチレンとジフルオロエチレンとジフルオロメタンとを含む熱サイクル用作動媒体であって、作動媒体の全量に対する前記ジフルオロエチレンの割合が1.5質量%未満であり、作動媒体の全量に対する前記トリフルオロエチレンと前記ジフルオロメタンの合計量の割合が80質量%以上であることを特徴とする熱サイクル用作動媒体を提供する。
さらに本発明は、トリフルオロエチレンとジフルオロエチレンと2,3,3,3-テトラフルオロプロペンとを含む熱サイクル用作動媒体であって、作動媒体の全量に対する前記ジフルオロエチレンの割合が1.5質量%未満であり、作動媒体の全量に対する前記トリフルオロエチレンと前記2,3,3,3-テトラフルオロプロペンの合計量の割合が70質量%以上であることを特徴とする熱サイクル用作動媒体を提供する。
さらに、また、本発明は、トリフルオロエチレンとジフルオロエチレンとジフルオロメタンと2,3,3,3-テトラフルオロプロペンとを含む熱サイクル用作動媒体であって、作動媒体の全量に対する前記ジフルオロエチレンの割合が1.5質量%未満であることを特徴とする熱サイクル用作動媒体を提供する。
本発明の実施形態の作動媒体は、HFO-1123とジフルオロエチレンを含有し、作動媒体の全量に対するジフルオロエチレンの割合が1.5質量%未満である。
実施形態の作動媒体は、HFO-1123とジフルオロエチレンの他に、後述する化合物をさらに含有してもよい。
HFO-1123は、地球温暖化係数(GWP)が低く、オゾン層への影響が少なく地球温暖化への影響が少ない。また、HFO-1123は、作動媒体としての能力に優れ、特にサイクル性能(例えば、後述する方法で求められる成績係数および冷凍能力)に優れている。
HFO-1123の含有量は、サイクル性能の点から、作動媒体の全量(100質量%)に対して20質量%以上が好ましく、30質量%以上がより好ましく、40質量%以上がさらに好ましい。
本発明の作動媒体においては、HFO-1123を、後述するHFC-32等と混合してHFO-1123の含有量を抑えることで、自己分解反応を抑えることができる。HFO-1123の含有割合を80質量%以下とした場合、熱サイクルシステムに適用する場合の温度や圧力条件下では自己分解性を有しないため、安全性の高い作動媒体を得ることができる。
ジフルオロエチレンは、HFO-1123の製造の際に副生し、不純物として生成組成物中に存在する化合物である。ジフルオロエチレンとしては、1,1-ジフルオロエチレン(HFO-1132a)と、E-および/またはZ-1,2-ジフルオロエチレン(HFO-1132)を挙げることができる。なお、E-および/またはZ-は、E体とZ体の混合物を意味し、E/Z-とも示す。
本発明におけるジフルオロエチレンの量はHFO-1132aとHFO-1132の合計量を意味するが、本発明の作動媒体としては特にHFO-1123の製造の際に副生し易く、不純物として生成組成物中に残存しやすいHFO-1132aが少ないことが好ましい。
なお、ジフルオロエチレンの含有量は、作動媒体の全量に対して4ppm以上とすることが好ましく、50ppm以上がさらに好ましく、100ppm以上が最も好ましい。含有量が4ppm以上であれば、粗HFO-1123を精製し不純物としてのジフルオロエチレンを低減する工程が簡略化できるという利点がある。
本発明の作動媒体は、HFO-1123およびジフルオロエチレン以外に、ヒドロフルオロカーボン(HFC)、およびその他のヒドロフルオロオレフィン(HFO)をさらに含むことができる。
本発明の作動媒体がHFC-32を含有する場合、HFO-1123とHFC-32の各含有量の割合は、HFO-1123とHFC-32との合計を100質量%として、HFO-1123を10~99質量%、HFC-32を90~1質量%が好ましく、HFO-1123を20~99質量%、HFC-32を80~1質量%がより好ましく、HFO-1123を25~99質量%、HFC-32を75~1質量%が特に好ましい。特に、HFO-1123の含有割合が90質量%であり、HFC-32の含有割合が10質量%である組成物は、気液両相の組成比の差が極めて小さく、共沸組成物となるので安定性に優れている。
本発明の作動媒体がHFO-1234yfを含有する場合、HFO-1123とHFO-1234yfの合計量に対するHFO-1123の含有量の割合は、35~95質量%が好ましく、40~95質量%がより好ましく、50~90質量%がさらに好ましく、50~85質量%がよりさらに好ましく、60~85質量%が最も好ましい。
HFO-1123とHFO-1234yfの合計量の作動媒体の全量に対する割合は、70質量%以上が好ましい。80質量%以上がより好ましく、90質量%以上がさらに好ましく、95質量%以上が特に好ましい。HFO-1123の含有量は、作動媒体の全量に対して20質量%以上であることが好ましく、40質量%以上であることがより好ましい。HFO-1123とHFO-1234yfの合計量が上記範囲内であれば、熱サイクルに用いた際に一定の能力を維持しながら効率をより高めることで、良好なサイクル性能が得られる。
HFO-1123をはじめとする各成分の割合を前記範囲内にすることで、地球温暖化への影響を抑えつつ、熱サイクルに用いた際に実用上十分なサイクル性能が得られる作動媒体とすることができる。
本発明の作動媒体には、HFO-1123、HFC-32、HFO-1234yfおよびジフルオロエチレン以外に、その他の成分を含有してもよい。その他の成分の含有量は、作動媒体の全量を100質量%として、ジフルオロエチレンとその他の成分の合計量で1.5質量%未満が好ましく、1.4質量%以下がより好ましい。
HFO-1123を製造する方法としては、例えば、(I)クロロトリフルオロエチレン(CTFE)(CFO-1113)の水素還元と、(II)クロロジフルオロメタン(HCFC-22)とクロロフルオロメタン(HCFC-31)との熱分解を伴う合成、および(III)1,1,1,2-テトラフルオロエタン(HFC-134a)と固体反応剤との接触反応の3つの方法を挙げることができる。
CFO-1113と水素とを、触媒担持担体が充填された触媒層を有する反応器内で気相で反応させ、HFO-1123を含むガスを生成する。
この方法では、反応器内で[化1]の反応式に示す反応が行われる。
HCFC-22とHCFC-31を含む原料組成物を用い、熱媒体の存在下で熱分解を伴う合成反応によりHFO-1123を製造する。
この製造方法では、HCFC-22の1モルに対してHCFC-31を0.01~4.0モルの割合で予め混合し、または別々に反応器に供給して反応器内に滞留させ、一方熱媒体を反応器に供給し、反応器内で前記原料組成物と接触させる。反応器内の温度は、400~1200℃とすることが好ましい。
熱媒体は、反応器内の温度で熱分解が生じない媒体であり、水蒸気を50体積%以上含み、残部が窒素および/または二酸化炭素である気体の使用が好ましい。熱媒体の供給量は、熱媒体と前記原料組成物の供給量の合計に対して20~98体積%が好ましい。熱媒体と原料組成物との反応器内での接触時間は、0.01~10秒間とするのが好ましく、反応器内の圧力は、ゲージ圧で0~2.0MPaとするのが好ましい。
HFC-134aを含む原料ガスと固体反応剤とを反応器内で接触させて反応させ、HFO-1123を含む組成物(ガス)を生成する。固体反応剤としては、例えば、粒子状の酸化カルシウムを使用することができる。
この態様における反応器内の主な反応を、[化3]の式に示す。
HFC-32を製造する方法としては、ジクロロメタン(HCC-30)とフッ化水素とを、フッ化アルミニウム触媒、またはフッ化アルミニウムを担体と混合成型した触媒、あるいはフッ化クロムを担体に担持させた触媒を用い、200~500℃の温度で気相反応させる方法を挙げることができる。この方法では、反応器の出口ガスに、目的とするHFO-32とともに、HFC-31が含有される。また、未反応のHCC-30も含有される。
HFO-1234yfを製造する方法としては、(i)ジクロロペンタフルオロプロパン(HCFC-225)の異性体混合物を用いる方法(225法)、(ii)ヘキサフルオロプロペン(FO-1216)を原料化合物とする方法(HFP法)、(iii)1,1,2,3-テトラクロロプロペン(HCC-1230)を出発物質とする方法(TCP法)、(iv)熱媒体存在下、原料組成物を熱分解を伴う合成反応させる方法等を挙げることができる。
HCFC-225の異性体混合物を用いてHFO-1234yfを製造する。この方法では、以下の[化4]に示す反応経路の通り、原料中の1,1-ジクロロ-2,2,3,3,3-ペンタフルオロプロパン(HCFC-225ca)を選択的に脱フッ化水素させて1,1-ジクロロ-2,3,3,3-テトラフルオロプロペン(CFO-1214ya)を製造し、得られるCFO-1214yaを還元してHFO-1234yfを製造する。
HCC-1230を出発物質として、HFO-1234yfを生成する。すなわち、以下の[化7]に示す反応経路の通り、HCC-1230をフッ化水素でフッ素化して2-クロロ-3,3,3-トリフルオロプロペン(HCFO-1233xf)とした後、このHCFO-1233xfをフッ化水素と反応させて2-クロロ-1,1,1,2-テトラフルオロプロパン(HCFC-244bb)とし、さらにHCFC-244bbを脱ハロゲン化水素してHFO-1234yfを生成する。
熱媒体存在下、原料組成物から熱分解を伴う合成反応によりHFO-1234yfを製造する。熱媒体としては、水蒸気、窒素、二酸化炭素等が使用される。水蒸気を50体積%以上含み、残部が窒素および/または二酸化炭素である気体の使用が好ましい。
具体的には、以下の(iv-1)~(iv-6)に示す化合物を含む原料組成物が使用される。そして、それぞれの項に示す化合物が、HFO-1234yfおよび未反応の原料成分以外に、反応器からの出口ガスの成分(不純物)として得られる。
HCFC-22とHCC-40を所定の割合で混合して、または別々に反応器に供給するとともに、反応器に熱媒体を供給し、反応器内でHCFC-22とHCC-40を含む原料組成物と熱媒体とを接触させ、熱分解を伴う合成反応により、HFO-1234yfとHFO-1132aを生成する。反応器内の温度は、400~1200℃とする。反応器内の主な反応を以下の[化8]に示す。
HCFC-22とHCC-40とFO-1114を、予め混合してまたは別々に反応器に供給し、反応器内に所定の時間滞留させ、熱媒体を反応器に供給し、反応器内で原料組成物と熱媒体とを接触させる。そして、熱分解を伴う合成反応により、HFO-1234yfとHFO-1132aを生成する。反応器内の温度は、400~1200℃とする。反応器内の主な反応を以下の[化9]に示す。
熱媒体存在下、R318とHCC-40を含む原料組成物から、熱分解を伴う合成反応によりHFO-1234yfおよびHFO-1132aを製造する。反応器の出口ガスに含有されるHFO-1234yfとHFO-1132aおよび未反応の原料成分以外の化合物としては、メタン、エチレン、HFC-22、FO-1114、FO-1216、CFO-1113、HFO-1123、HFO-1234ze、HFO-1132等が挙げられる。
熱媒体存在下、FO-1216とHCC-40を含む原料組成物から、熱分解を伴う合成反応によりHFO-1234yfおよびHFO-1132aを製造する。反応器の出口ガスに含有されるHFO-1234yfとHFO-1132aおよび未反応の原料成分以外の化合物としては、メタン、エチレン、HFC-22、HFC-23、FO-1114、FO-1216、CFO-1113、RC318、HFO-1123、HFO-1234ze、HFO-1132等が挙げられる。
熱媒体存在下、HFC-22および/またはFO-1114と、メタンを含む原料組成物から、熱分解を伴う合成反応によりHFO-1234yfとHFO-1132aを製造する。反応器の出口ガスに含有されるHFO-1234yfとHFO-1132aおよび未反応の原料成分以外の化合物としては、メタン、エチレン、FO-1114、FO-1216、CFO-1113、RC318、HFO-1123、HFO-1243zf等が挙げられる。
熱媒体存在下、FO-1114とHCC-40を含む原料組成物から、熱分解を伴う合成反応によりHFO-1234yfを製造する。原料組成物および熱媒体が供給される反応器内の温度は400~870℃とする。反応器の出口ガスに含有されるHFO-1234yfおよび未反応の原料成分以外の化合物としては、メタン、エチレン、FO-1216、CFO-1113、RC318、HFO-1132a、HFO-1123、HFO-1243zf等が挙げられる。
冷凍・冷蔵機器として、具体的には、ショーケース(内蔵型ショーケース、別置型ショーケース等)、業務用冷凍・冷蔵庫、自動販売機、製氷機等が挙げられる。
発電システムとして、具体的には、蒸発器において地熱エネルギー、太陽熱、50~200℃程度の中~高温度域廃熱等により作動媒体を加熱し、高温高圧状態の蒸気となった作動媒体を膨張機にて断熱膨張させ、該断熱膨張によって発生する仕事によって発電機を駆動させ、発電を行うシステムが例示される。
熱輸送装置としては、潜熱輸送装置が好ましい。潜熱輸送装置としては、装置内に封入された作動媒体の蒸発、沸騰、凝縮等の現象を利用して潜熱輸送を行うヒートパイプおよび二相密閉型熱サイフォン装置が挙げられる。ヒートパイプは、半導体素子や電子機器の発熱部の冷却装置等、比較的小型の冷却装置に適用される。二相密閉型熱サイフォンは、ウィッグを必要とせず構造が簡単であることから、ガス-ガス型熱交換器、道路の融雪促進および凍結防止等に広く利用される。
HFO-1123と、HFC-32および/またはHFO-1234yfを表3に示す割合で含み、かつ作動媒体に対してHFO-1132aを同表に示す割合で含有する作動媒体を作製した。そして、これらの作動媒体について、以下の方法で、冷凍サイクル性能(以下、冷凍能力Qという。)を測定した。
なお、冷凍能力Qは負荷流体を冷凍する能力を意味しており、Qが高いほど同一のシステムにおいて、多くの仕事ができることを意味している。言い換えると、大きなQを有する場合は、少量の作動媒体で目的とする性能が得られることを表しており、システムの小型化が可能となる。
冷凍能力Qの測定は、図1に示す冷凍サイクルシステム10に作動媒体を適用して、図2に示す熱サイクル、すなわちAB過程で圧縮機11による断熱圧縮、BC過程で凝縮器12による等圧冷却、CD過程で膨張弁13による等エンタルピ膨張、DA過程で蒸発器14による等圧加熱を実施した場合について行った。
なお、2013年4月30日に出願された日本特許出願2013-095491号および2014年2月20日に出願された日本特許出願2014-030855号の明細書、特許請求の範囲、図面及び要約書の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (14)
- トリフルオロエチレンとジフルオロエチレンを含有し、作動媒体の全量に対する前記ジフルオロエチレンの割合が1.5質量%未満であることを特徴とする熱サイクル用作動媒体。
- 前記ジフルオロエチレンが1,1-ジフルオロエチレンである、請求項1に記載の熱サイクル用作動媒体。
- 作動媒体の全量に対する前記トリフルオロエチレンの割合が20質量%以上である、請求項1または2に記載の熱サイクル用作動媒体。
- さらに、ヒドロフルオロカーボンおよび/またはヒドロフルオロオレフィンを含む、請求項1~3のいずれか一項に記載の熱サイクル用作動媒体。
- 前記ヒドロフルオロカーボンがジフルオロメタンである、請求項4に記載の熱サイクル用作動媒体。
- 前記ヒドロフルオロオレフィンが2,3,3,3-テトラフルオロプロペンである、請求項4または5に記載の熱サイクル用作動媒体。
- トリフルオロエチレンとジフルオロエチレンとジフルオロメタンとを含む熱サイクル用作動媒体であって、作動媒体の全量に対する前記ジフルオロエチレンの割合が1.5質量%未満であり、作動媒体の全量に対する前記トリフルオロエチレンと前記ジフルオロメタンの合計量の割合が80質量%以上であることを特徴とする熱サイクル用作動媒体。
- 前記ジフルオロエチレンが1,1-ジフルオロエチレンである、請求項7に記載の熱サイクル用作動媒体。
- 作動媒体の全量に対する前記トリフルオロエチレンの割合が20質量%以上である、請求項7または8に記載の熱サイクル用作動媒体。
- トリフルオロエチレンとジフルオロエチレンと2,3,3,3-テトラフルオロプロペンとを含む熱サイクル用作動媒体であって、作動媒体の全量に対する前記ジフルオロエチレンの割合が1.5質量%未満であり、作動媒体の全量に対する前記トリフルオロエチレンと前記2,3,3,3-テトラフルオロプロペンの合計量の割合が70質量%以上であることを特徴とする熱サイクル用作動媒体。
- 前記ジフルオロエチレンが1,1-ジフルオロエチレンである、請求項10に記載の熱サイクル用作動媒体。
- 作動媒体の全量に対する前記トリフルオロエチレンの割合が20質量%以上である、請求項10または11に記載の熱サイクル用作動媒体。
- トリフルオロエチレンとジフルオロエチレンとジフルオロメタンと2,3,3,3-テトラフルオロプロペンとを含む熱サイクル用作動媒体であって、作動媒体の全量に対する前記ジフルオロエチレンの割合が1.5質量%未満であることを特徴とする熱サイクル用作動媒体。
- 作動媒体の全量に対して、前記トリフルオロエチレンの割合が20質量以上70質量%未満であり、ジフルオロメタンの割合が30質量%以上75質量%以下であり、2,3,3,3-テトラフルオロプロペンの割合が50質量%以下である、請求項13に記載の熱サイクル用作動媒体。
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CN105164228A (zh) | 2015-12-16 |
US20150376486A1 (en) | 2015-12-31 |
CN105164228B (zh) | 2019-06-11 |
JPWO2014178353A1 (ja) | 2017-02-23 |
EP2993212A4 (en) | 2016-12-28 |
EP2993212A1 (en) | 2016-03-09 |
US10053607B2 (en) | 2018-08-21 |
EP2993212B1 (en) | 2019-08-28 |
JP6384475B2 (ja) | 2018-09-05 |
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