EP4554708A1 - Procédé de purification du 1,1,1,2,3,3-hexafluoropropane - Google Patents
Procédé de purification du 1,1,1,2,3,3-hexafluoropropaneInfo
- Publication number
- EP4554708A1 EP4554708A1 EP23751052.4A EP23751052A EP4554708A1 EP 4554708 A1 EP4554708 A1 EP 4554708A1 EP 23751052 A EP23751052 A EP 23751052A EP 4554708 A1 EP4554708 A1 EP 4554708A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- hexafluoropropane
- mixture
- poly
- hydrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/08—Polysaccharides
- B01D71/12—Cellulose derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/26—Polyalkenes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
- B01D71/401—Polymers based on the polymerisation of acrylic acid, e.g. polyacrylate
- B01D71/4011—Polymethylmethacrylate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/52—Polyethers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/52—Polyethers
- B01D71/522—Aromatic polyethers
- B01D71/5223—Polyphenylene oxide, phenyl ether polymers or polyphenylethers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/58—Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
- B01D71/62—Polycondensates having nitrogen-containing heterocyclic rings in the main chain
- B01D71/64—Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
- C07C17/354—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction by hydrogenation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C19/00—Acyclic saturated compounds containing halogen atoms
- C07C19/08—Acyclic saturated compounds containing halogen atoms containing fluorine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/16—Hydrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/26—Halogens or halogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/206—Organic halogen compounds
- B01D2257/2066—Fluorine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7022—Aliphatic hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/26—Further operations combined with membrane separation processes
- B01D2311/263—Chemical reaction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/20—Specific permeability or cut-off range
Definitions
- the present invention relates to a process for purifying hydrofluoroalkanes.
- the present invention relates to a process for purifying hydrofluoroalkanes by membrane separation.
- 1,1,1,2,3,3-hexafluoropropane is a hydrofluorocarbon and has been described as a raw material to manufacture 1,1,1,2,3-pentafluoropropene or as an intermediate in the manufacture of 1,1,1,2,3-pentafluoropropane and/or 2,3,3,3-tetrafluoropropene.
- HFC-236ea is a hydrofluorocarbon and has been described as a raw material to manufacture 1,1,1,2,3-pentafluoropropene or as an intermediate in the manufacture of 1,1,1,2,3-pentafluoropropane and/or 2,3,3,3-tetrafluoropropene.
- 1,1,1,2,3,3-hexafluoropropane can also be prepared according to a process during which at least one tetrafluorochloropropene is obtained from the dechlorofluorination of 1,1,1,2,2-pentafluoro-3, 3-dichloropropane (HCFC-225ca) and/or 1,1,2,2,3-pentafluoro-1,3-dichloropropane (HCFC-225cb) with hydrogen in the presence of an oxide catalyst metallic.
- HCFO-1224yc 1.1.2.3-tetrafluoro-3-chloro-l-propene
- HFO-1225ye 1.2.3.3.3-pentafluoropropene (HFO-1225ye) with hydrogen fluoride at an elevated temperature, over a catalyst selected from the group consisting of aluminum fluoride, fluorinated aluminum oxide, fluoride-supported metals aluminum, fluorinated aluminum oxide supported metals and catalysts comprising trivalent chromium.
- 1,1,1,2,3,3-hexafluoropropane can in particular be prepared by catalytic hydrogenation of hexafluoropropene. This reaction is generally carried out in excess of hydrogen. Hydrogen is generally removed by several distillation steps and drying steps prior to distillation. 1,1,1,2,3,3-hexafluoropropane can be used as a cleaning agent in the semiconductor industry. In this type of application, 1,1,1,2,3,3-hexafluoropropane must be of high purity. There is therefore a need to provide a process for purifying 1,1,1,2,3,3-hexafluoropropane making it possible to eliminate certain contaminants resulting from the processes for its preparation.
- the present invention relates to a process for purifying 1,1,1,2,3,3-hexafluoropropane from a mixture comprising 1,1,1,2,3,3-hexafluoropropane and hydrogen; said method comprising a step (a) of bringing said mixture into contact with a membrane Ml to form a flow Fl comprising said 1,1,1,2,3,3- hexafluoropropane and a flow F2 comprising hydrogen characterized in that said membrane Ml is made of a material selected from the group consisting of polyolefin, polyether, polyimide, polyvinylidene fluoride, a cellulose-based material and poly(methyl methacrylate).
- said membrane Ml is made of a material selected from the group consisting of polyolefin and polyether.
- said membrane Ml is made of a material selected from the group consisting of polyethylene, polypropylene, polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)] and poly(phenylene oxide ).
- said Ml membrane has a selectivity greater than 100; said selectivity being calculated by the ratio between the permeability of hydrogen and the permeability of said 1,1,1,2,3,3-hexafluoropropane through said membrane Ml; preferably the selectivity is greater than 250, in particular greater than 500.
- said mixture contains less than 100 ppm of water based on the total weight of said mixture.
- the mass content of hydrogen in said mixture is less than 25% by weight based on the total weight of said mixture.
- said mixture comes from a hydrogenation reaction of hexafluoropropene, optionally previously purified, preferably by distillation.
- the present invention relates to a process for producing 1,1,1,2,3,3-hexafluoropropane comprising the steps of: A) Gas phase hydrogenation of hexafluoropropene in the presence of hydrogen and a hydrogenation catalyst to form a stream Al comprising 1, 1,1, 2,3,3- hexafluoropropane and hydrogen n' not having reacted;
- the present invention relates to a process for purifying 1,1,1,2,3,3-hexafluoropropane from a mixture comprising 1,1,1,2,3,3-hexafluoropropane and at least one contaminant selected from the group consisting of nitrogen and oxygen or a mixture thereof; said method comprising a step (a) of bringing said mixture into contact with a membrane Ml' to form a flow Fl' comprising said 1,1,1,2,3,3- hexafluoropropane and a flow F2' comprising said at least one contaminant.
- said membrane Ml' is made of a material selected from the group consisting of polyolefin, polyether, polyimide, polyaramide, polyamide, polysulfone, polyvinylidene fluoride, poly(methyl methacrylate), polytetrafluoroethylene, polyvinyl fluoride, polychlorotrifluoroethylene, polyethylenetetrafluoroethylene or tetrafluoroethylene/perfluorovinylether copolymer optionally substituted with a SO3H group, in a cellulose-based material and in a material containing a siloxane functional group.
- said contaminant is oxygen and said membrane Ml' is made of a material selected from the group consisting of polyolefin, polyether, polyimide, polyvinylidene fluoride, a cellulose-based material, polyalkylsiloxane and poly(methacrylate methyl).
- said membrane Ml' is made of a material selected from the group consisting of polyethylene, polypropylene, polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)], poly(oxide of phenylene), cellulose acetate, polyimide and polydimethylsiloxane.
- said contaminant is nitrogen and said membrane Ml' is made of a material selected from the group consisting of polyolefin and polyether, preferably polyethylene, polypropylene, polymethylpentene, poly[oxy-(2,6- dimethyl-1,4-phenylene)] or poly(phenylene oxide); in particular polypropylene, poly(phenylene oxide), or polymethylpentene.
- the mass content of said contaminant in said mixture is less than 5% based on the total weight of said mixture, preferably less than 1% based on the total weight of said mixture.
- the present invention relates to a process for purifying 1,1,1,2,3,3-hexafluoropropane from a mixture comprising 1,1,1,2,3,3-hexafluoropropane, nitrogen, hydrogen and optionally oxygen; said method comprising a step (a) of bringing said mixture into contact with a membrane M2 to form a flow F3 comprising said 1,1,1,2,3,3-hexafluoropropane and a flow F4 comprising nitrogen, hydrogen and optionally oxygen; said membrane M2 being made of a material selected from the group consisting of polyethylene, polypropylene, polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)] and poly(phenylene oxide).
- the present invention relates to a process for purifying
- Said method comprises a step (a) of bringing said mixture into contact with a membrane Ml to form a flow Fl comprising said 1,1,1,2,3,3-hexafluoropropane and a flow F2 comprising hydrogen.
- said mixture comprises a molar hydrogen content of less than 50%, preferably less than 25%, in particular less than 15% based on the total mole quantity of the mixture.
- said mixture comprises a molar hydrogen content greater than 0.5%, preferably greater than 1% based on the total mole quantity of the mixture.
- said mixture is in gaseous form.
- the present process thus makes it possible to produce a flow Fl enriched in 1,1,1,2,3,3-hexafluoropropane compared to the initial mixture before contact with the membrane.
- said flow Fl has a reduced molar hydrogen content compared to said mixture.
- said flow Fl comprises at least 25% by weight of
- 1.1.1.2.3.3-hexafluoropropane advantageously at least 30% by weight of 1,1,1,2,3,3-hexafluoropropane, preferably at least 35% by weight of 1,1,1,2,3,3 -hexafluoropropane, more preferably at least 40% by weight of 1,1,1,2,3,3-hexafluoropropane, in particular at least 45% by weight of 1,1,1,2,3,3-hexafluoropropane, more particularly at least 50% by weight of 1,1,1,2,3,3-hexafluoropropane based on the total weight of said stream Fl.
- said flow Fl comprises less than 20% by weight of hydrogen based on the total weight of said flow Fl.
- said flow Fl comprises less than 15% by weight of hydrogen, preferably less than 10% by weight, in particular less than 5% by weight, more particularly less than 1% by weight of hydrogen based on the total weight of said flow Fl.
- the flow F2 is enriched with hydrogen.
- said flow F2 has an increased molar hydrogen content compared to said mixture.
- said flow F2 comprises at least 25% by weight of hydrogen, more preferably at least 50% by weight of hydrogen, in particular at least 75% by weight of hydrogen, more particularly at least 80% by weight of hydrogen, preferably at least 95% by weight of hydrogen based on the total weight of said flow F2.
- the term membrane refers to a membrane which is selectively permeable to one or more compounds such that it allows different compounds to migrate therethrough at different flow rates.
- the membrane restricts the movement of molecules passing through it so that some molecules move more slowly than others or are excluded completely (i.e. impermeable).
- the membrane may be selectively permeable to hydrogen and impermeable (or weakly permeable) to 1,1,1,2,3,3-hexafluoropropane.
- the permeability of a membrane depends on its ability to limit or not the diffusion of these compounds through it.
- Membranes can selectively separate components over a wide range of solubility parameters and molecular sizes, from macromolecular materials to simple ionic or covalent compounds.
- the determining property for membrane performance is mainly selectivity.
- the membrane separation process is characterized by the fact that a feed stream is divided into two streams: retentate and permeate.
- the retentate is the part of the feed that does not (or barely) pass through the membrane, while the permeate is the part of the feed that passes through the membrane.
- the retentate can be one of the flows described depending on the membrane used and the compounds considered.
- membrane separation does not require phase separation, which generally provides significant energy savings compared to distillation processes.
- Investment costs can also be reduced because membrane separation processes generally have no moving parts, no complex control schemes and little auxiliary equipment compared to other separation processes known in the art.
- Membranes can be produced with extremely high selectivity for the components to be separated. In general, selectivity values are much higher than typical relative volatility values for distillation operations. Membrane separation processes may also be able to recover minor but valuable components from the main stream without substantial energy cost. Membrane separation processes are potentially better for the environment since the membrane approach requires the use of relatively simple and non-harmful materials.
- said membrane Ml is made of a material selected from the group consisting of polyolefin, polyether, polyimide, polyvinylidene fluoride, a material based on cellulose and poly(methyl methacrylate).
- said membrane Ml is made of a material selected from the group consisting of polyolefin and polyether.
- said membrane Ml is made of a material selected from the group consisting of polyethylene, polypropylene, polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)] and poly(phenylene oxide).
- polyether refers in particular to a polyaryl ether comprising the monomeric unit -[-O-Ar-]- or -[-Ar 1 -O-Ar 2 -]- in which Ar, Ar 1 and Ar 2 are, independently of each other, an aromatic ring comprising 6 to 12 carbon atoms optionally substituted by one or more C1-C10 alkyl functional groups; preferably Ar is a phenyl group optionally substituted by one, two, three or four C1-C3 alkyl functional groups.
- the polyether is poly[oxy-(2,6-dimethyl-1,4-phenylene)] or poly(phenylene oxide).
- the term cellulose refers to a polymer consisting of a linear chain of D-glucose units whose hydroxyl function is optionally, partially or not, substituted.
- the cellulose is preferably cellulose acetate.
- polyolefin refers in particular to polyethylene, polypropylene, polymethylpropene, polybutene, polypentene, polymethylpentene, polymethylbutene, polyhexene, polymethylpentene and polyethylbutene.
- selectivity is greater than 2.
- the process is particularly effective when the selectivity is greater than or equal to 5, preferably greater than or equal to 10, in particular greater than or equal to 20.
- selectivity [permeability of hydrogen] / [permeability of 1,1 ,1,2,3,3-hexafluoropropane]
- said membrane Ml has a selectivity greater than 4, advantageously greater than 5, preferably greater than 6, more preferably greater than 7, in particular greater than 8, more particularly greater than 9; said selectivity being calculated by the ratio between the permeability of hydrogen and the permeability of 1,1,1,2,3,3-hexafluoropropane therethrough.
- the selectivity of said membrane Ml may be greater than 10, or greater than 15, or greater than 20, or greater than 25, or greater than 30, or greater than 35, or greater than 40, or greater than 45, or greater than 50, or greater than 55, or greater than 60, or greater than 65, or greater than 70, or greater than 75, or greater than 80, or greater than 85 or greater than 90 or greater than 95 or greater than 100 or greater than 105 or greater than 110 or greater than 115 or greater than 120 or greater than 125 or greater than 130 or greater than 135 or greater than 140 or greater than 145 or greater than 150; said selectivity being calculated by the ratio between the permeability of hydrogen and the permeability of said 1,1,1,2,3,3-hexafluoropropane through said membrane Ml; preferably when it is made of polyolefin or polyether.
- said membrane Ml has a selectivity greater than 200, advantageously greater than 250, preferably greater than 300, more preferably greater than 400, in particular greater than 500; said selectivity being calculated by the ratio between the permeability of hydrogen and the permeability of said 1,1,1,2,3,3-hexafluoropropane through said membrane Ml; preferably when it is made of polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)] and poly(phenylene oxide).
- the mixture of step (a) has a mass water content of less than 1000 ppm, advantageously 500 ppm, preferably less than 200 ppm, more preferably less than 100 ppm, in particular less than 50 ppm, more particularly less than 10 ppm based on the total weight of the mixture.
- said mixture of step a) comes from a hydrogenation reaction of hexafluoropropene, optionally previously purified, preferably by distillation. This is detailed below in the section concerning the production of 1,1,1,2,3,3-hexafluoropropane.
- said membrane Ml is chosen from a film, a laminated structure, hollow fibers and coated fibers.
- Step (a) can be implemented over a wide range of temperature and pressure.
- step (a) of bringing said mixture into contact with said membrane Ml is carried out at a pressure of 0.1 bara to 30 bara, advantageously of 0.2 bara to 25 bara, preferably of 0. 3 bara to 20 bara, more preferably from 0.4 bara to 15 bara, in particular from 0.5 bara to 10 bara, more particularly from 0.5 bara to 5 bara.
- step (a) of bringing said mixture into contact with said membrane Ml is carried out at a temperature of 0°C to 150°C, advantageously of 0°C to 125°C, preferably of 5°C. C to 100°C, more preferably from 10 to 75°C, in particular from 10 to 50°C.
- a pressure difference is observed between the inlet of the membrane and the outlet of the membrane.
- the differential pressure expressed here corresponds to the pressure difference existing between the inlet and outlet of said membrane.
- the differential pressure is 1 to 3000 kPa, preferably 50 to 2000 kPa, in particular 100 to 1000 kPa, more particularly 100 to 500 kPa.
- a process for purifying 1,1,1,2,3,3-hexafluoropropane from a mixture comprising 1,1,1,2,3,3-hexafluoropropane and at least one contaminant selected from the group consisting of nitrogen and oxygen or a mixture thereof is provided.
- said membrane Ml' may be made of a material selected from the group consisting of polyolefin, polyether, polyimide, polyaramide, polyamide, polysulfone, polyvinylidene fluoride, poly(methyl methacrylate), polytetrafluoroethylene, polyvinyl fluoride, polychlorotrifluoroethylene, polyethylenetetrafluoroethylene or tetrafluoroethylene/perfluorovinylether copolymer optionally substituted with a SO3H group, in a cellulose-based material and in a material containing a siloxane functional group.
- said at least one contaminant is nitrogen.
- said membrane Ml' is preferably made of a material selected from the group consisting of polyolefin and polyether.
- polyolefin and polyether are as defined above.
- said membrane Ml' is made of a material selected from the group consisting of polyethylene, polypropylene, polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)] or poly(phenylene oxide).
- said membrane Ml' is made of a material selected from the group consisting of polypropylene or polymethylpentene.
- Said membrane Ml' preferably has a selectivity greater than 5; said selectivity being calculated by the ratio between the permeability of nitrogen and the permeability of said 1,1,1, 2,3,3- hexafluoropropane through said membrane Ml'.
- said membrane Ml' has a selectivity greater than 10, preferably greater than 20, more preferably greater than 50, in particular greater than 75; said selectivity being calculated by the ratio between the permeability of nitrogen and the permeability of said 1,1,1,2,3,3-hexafluoropropane through said membrane Ml'.
- said at least one contaminant is oxygen.
- said membrane Ml' preferably has a selectivity greater than 5; said selectivity being calculated by the ratio between the permeability of oxygen and the permeability of said 1,1,1,2,3,3-hexafluoropropane through said membrane Ml'.
- said membrane Ml' has a selectivity greater than 10, preferably greater than 20, more preferably greater than 50, in particular greater than 75; said selectivity being calculated by the ratio between the permeability of oxygen and the permeability of said 1,1,1,2,3,3-hexafluoropropane through said membrane Ml'.
- said membrane Ml' is made of a material selected from the group consisting of polyolefin, polyether, polyimide, polyvinylidene fluoride, a cellulose-based material, polyalkylsiloxane and poly(methyl methacrylate).
- said membrane Ml' is made of a material selected from the group consisting of polypropylene, polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)], poly(phenylene oxide).
- Step (a) can be implemented over a wide range of temperature and pressure.
- step (a) of bringing said mixture into contact with said membrane Ml' is carried out at a pressure of 0.1 bara to 30 bara, advantageously of 0.2 bara to 25 bara, preferably of 0 .3 bara to 20 bara, more preferably from 0.4 bara to 15 bara, in particular from 0.5 bara to 10 bara, more particularly from 0.5 bara to 5 bara.
- step (a) of bringing said mixture into contact with said membrane Ml' is carried out at a temperature of 0°C to 150°C, advantageously of 0°C to 125°C, preferably of 5 °C to 100°C, more preferably from 10 to 75°C, in particular from 10 to 50°C.
- a pressure difference is observed between the inlet of the membrane and the outlet of the membrane.
- the differential pressure expressed here corresponds to the pressure difference existing between the inlet and outlet of said membrane.
- the differential pressure is 1 to 3000 kPa, preferably 50 to 2000 kPa, in particular 100 to 1000 kPa, more particularly 100 to 500 kPa.
- the mixture of step (a) is in anhydrous form.
- anhydrous refers to a mass water content of less than 1000 ppm, advantageously 500 ppm, preferably less than 200 ppm, in particular less than 100 ppm based on the total weight of the mixture.
- said membrane Ml' is chosen from a film, a laminated structure, hollow fibers and coated fibers.
- the mass content of said contaminant in said mixture subjected to step (a) is less than 15% based on the total weight of said mixture, advantageously less than 10%, preferably less than 5%, in particular less than 1% based on the total weight of said mixture.
- the mass content of 1,1,1,2,3,3-hexafluoropropane in said mixture subjected to step (a) is greater than 50% based on the total weight of said mixture, advantageously greater at 70%, preferably greater than 80%, in particular greater than 90% based on the total weight of said mixture.
- said mixture is in gaseous form.
- the present process thus makes it possible to produce a flow Fl' enriched in 1,1,1,2,3,3-hexafluoropropane compared to the initial mixture before contact with the membrane Ml'.
- said flow Fl' has a reduced molar content of said contaminant compared to said mixture.
- said flow Fl' comprises at least 60% by weight of 1,1,1,2,3,3-hexafluoropropane, advantageously at least 70% by weight of 1,1,1,2,3 ,3-hexafluoropropane, preferably at least 80% by weight of 1,1,1,2,3,3- hexafluoropropane, more preferably at least 90% by weight of 1,1, 1,2, 3, 3- hexafluoropropane, in particular at least 95% by weight of 1,1,1,2,3,3-hexafluoropropane based on the total weight of said stream Fl'.
- said flow Fl' comprises less than 10% by weight of said contaminant based on the total weight of said flow Fl'.
- said flow Fl' comprises less than 5% by weight of said contaminant, preferably less than 1% by weight, in particular less than 0.5% by weight, more particularly less than 0.1% by weight of said contaminant based on the total weight of said flow Fl'.
- the flow F2' is enriched in said contaminant.
- said flow F2' has an increased molar hydrogen content compared to said mixture.
- said flow F2' comprises at least 25% by weight of said contaminant, more preferably at least 50% by weight of said contaminant, in particular at least 75% by weight of said contaminant, more particularly at least 80% by weight in said contaminant, preferably at least 95% by weight of said contaminant based on the total weight of said flow F2'.
- the present invention provides a process for purifying 1,1,1,2,3,3-hexafluoropropane from a mixture comprising 1,1,1,2,3,3-hexafluoropropane, nitrogen, hydrogen and optionally oxygen.
- said method comprising a step (a) of bringing said mixture into contact with a membrane M2 to form a flow F3 comprising said 1,1,1,2,3,3-hexafluoropropane and a flow F4 comprising nitrogen , hydrogen and optionally oxygen.
- said membrane M2 is made of a material selected from the group consisting of polyolefin and polyether.
- said membrane M2 is made of a material selected from the group consisting of polyethylene, polypropylene, polymethylpentene, poly[oxy-(2,6-dimethyl-1,4-phenylene)] and poly(phenylene oxide ).
- Step (a) can be implemented over a wide range of temperature and pressure.
- step (a) of bringing said mixture into contact with said membrane M2 is carried out at a pressure of 0.1 bara to 30 bara, advantageously of 0.2 bara to 25 bara, preferably of 0. 3 bara to 20 bara, more preferably from 0.4 bara to 15 bara, in particular from 0.5 bara to 10 bara, more particularly from 0.5 bara to 5 bara.
- step (a) of bringing said mixture into contact with said membrane M2 is carried out at a temperature of 0°C to 150°C, advantageously of 0°C to 125°C, preferably of 5°C. C to 100°C, more preferably from 10 to 75°C, in particular from 10 to 50°C.
- a pressure difference is observed between the inlet of the membrane and the outlet of the membrane.
- the differential pressure expressed here corresponds to the pressure difference existing between the inlet and outlet of said membrane.
- the differential pressure is 1 to 3000 kPa, preferably 50 to 2000 kPa, in particular 100 to 1000 kPa, more particularly 100 to 500 kPa.
- the mixture of step (a) is in anhydrous form.
- anhydrous refers to a mass water content of less than 1000 ppm, advantageously 500 ppm, preferably less than 200 ppm, in particular less than 100 ppm based on the total weight of the mixture.
- said membrane M2 is chosen from a film, a laminated structure, hollow fibers and coated fibers.
- Said membrane M2 preferably has a selectivity greater than 5, advantageously greater than 10, preferably greater than 20, more preferably greater than 50, in particular greater than 75; said selectivity being calculated by the ratio between the permeability of nitrogen or hydrogen or oxygen and the permeability of said 1, 1,1, 2,3,3- hexafluoropropane through said membrane M2; as demonstrated above.
- the present invention provides a process for producing 1,1,1,2,3,3-hexafluoropropane. Said method comprises the steps of:
- hydrogenation step A) is carried out in the presence of a catalyst.
- a catalyst mention may in particular be made of metals such as Pd, Ru, Pt, Rh, Ir, Fe, Co, Ni, Cu, Ag, Re, Os, Au, Ge, Te which may be supported.
- metals such as Pd, Ru, Pt, Rh, Ir, Fe, Co, Ni, Cu, Ag, Re, Os, Au, Ge, Te which may be supported.
- a support mention may be made in particular of carbon, alumina, fluorinated alumina, AIF3, oxides, oxyfluorides and fluorides of Cr, Ti, Zr, Mg, Zn, silica and silicon carbide.
- the quantity of metals present in the catalyst, when it is supported can be between 0.001 and 10% by weight, preferably between 0.001 and 1.0% by weight, in particular from 0.01 to 0.2 % in weight.
- the hydrogenation step is advantageously carried out in the presence of Pd supported on alumina, preferably in the alpha polymorphic form.
- said hydrogenation catalyst may comprise Pd supported on alumina in the alpha polymorphic form; palladium representing between 0.001 and 1.0% by weight, preferably 0.01 to 0.2% based on the total weight of the catalyst.
- the hydrogenation step can be carried out both in the liquid phase and in the gas phase.
- the gas phase is however preferred.
- Hydrogenation step A) is carried out in the presence of hydrogen, advantageously with a hydrogen/hexafluoropropene molar ratio of between 1 and 50, and very particularly between 2 and 15.
- the hydrogenation step A) is preferably carried out at a temperature between 50 and 200°C, preferably between 80 and 120°C.
- the temperature at the reactor inlet of hydrogenation step A) is between 30 and 100° C., advantageously between 40 and 80° C.
- the contact time of the hydrogenation step A defined as the ratio of the volume of the catalytic bed to the volume flow rate of the total flow under normal conditions of temperature and pressure, is preferably between 0.1 s and 20 s and advantageously between 0.5 and 5 s.
- the hydrogenation step A) is preferably carried out at an absolute pressure of between 0.5 and 20 bar and advantageously of between 1 and 5 bar.
- the hydrogenation step A) is carried out in the presence of a diluent which can be co-introduced with the reagents into the reaction medium.
- the diluent is an inert gas which does not react under the conditions of the hydrogenation step.
- a diluent we can cite nitrogen, helium or argon.
- the molar ratio of diluent/reagents at the reactor inlet of hydrogenation step A) can be between 100:1 and 1:1, preferably between 75:1 and 1:1, advantageously between 50:1 and 1:1.
- the diluent can be the hydrogenation product which is HFC-236ea.
- part of the gaseous effluent from the reactor comprising HFC-236ea, unreacted hydrogen and possibly unreacted hexafluoropropene is recycled and the other part of the gaseous effluent from the reactor is subjected to a separation and/or purification step.
- the gas flow comprising the recycling loop and the reagents can be preheated before introduction into the reactor.
- the part of the gaseous effluent recycled to the reactor preferably represents at least 90% by volume of the total effluent leaving the reactor, advantageously at least 93% by volume. Of particularly preferred way, the part of the effluent recycled to the reactor represents between 94 and 98% by volume of the total effluent at the reactor outlet.
- the Al current can be purified before carrying out step C).
- Purification can be a drying step.
- the drying step can be carried out by bringing said stream into contact with a solid absorbent agent.
- Said solid absorbent may comprise an agent absorbing acid molecules and/or a water absorbing agent.
- Said water absorbent agent may be an inorganic salt such as magnesium sulfate, calcium sulfate, calcium chloride or may be a molecular sieve of type 3A, 4A, 5A, AW500, XH-7, XH-9 or 13X, silica gel, activated carbon or a mixture thereof.
- Said agent absorbing acidic molecules may be a metal oxide such as aluminum oxide, the oxide of an alkaline earth metal, the oxide of an alkali metal or the hydroxide of a metal such as aluminum hydroxide, alkaline earth metal hydroxide, alkali metal hydroxide, aluminosilicates such as andalusite, kyanite, silimanite, calcium aluminosilicate, sodium aluminosilicate or silica or a mixture of these this.
- a metal oxide such as aluminum oxide, the oxide of an alkaline earth metal, the oxide of an alkali metal or the hydroxide of a metal such as aluminum hydroxide, alkaline earth metal hydroxide, alkali metal hydroxide, aluminosilicates such as andalusite, kyanite, silimanite, calcium aluminosilicate, sodium aluminosilicate or silica or a mixture of these this.
- the purification comprises a step of condensation of the Al stream.
- the Al stream at the end of the hydrogenation step A) can be subjected to a condensation step under conditions such as hydrogen unreacted is not condensed and a portion of HFC-236ea formed in step A) is condensed.
- the condensation step is carried out at a temperature between 0 and 50°C and at a pressure between 0.5 and 20 bar absolute, advantageously between 1 and 5 bar absolute.
- the condensation step is carried out under conditions such that between 1 and 30% of HFC-236ea leaving the reactor is condensed and advantageously between 2 and 10% is condensed.
- the non-condensed fraction can then be recycled to the hydrogenation step A) after possible heating.
- the non-condensed fraction can be subjected to step C) of the present process.
- the uncondensed fraction includes 1,1,1,2,3,3-hexafluoropropane and hydrogen.
- the condensed fraction thus recovered and purified, can then be evaporated before being sent to step C).
- the condensed fraction can be said purified stream A2.
- the condensed fraction Before carrying out step C), the condensed fraction can be purified and/or dried. Fraction condensed includes 1,1,1,2,3,3-hexafluoropropane and hydrogen. Hydrogen is, however, preferably present in small proportions.
- step B) can be a distillation step to recover a stream A2 comprising 1,1,1,2,3,3-hexafluoropropane and hydrogen, said stream A2 being enriched in 1 ,1,1,2,3,3-hexafluoropropane relative to the Al current.
- a distillation step can be carried out after step C).
- the flow Fl as defined in the present application can be distilled.
- the permeability of a gaseous compound through a polymer is measured using a MET Crossflow Filtration Cell from Evonik (with an internal diameter of 52 mm and an active surface area of 14 cm 2 ) for polymers in the form of film or a commercial module for polymers in fiber form.
- the polyimide film is a Dupont Kapton HN film
- the polymethylpentene film has the reference MX004
- the silicone has the reference USP class VI.
- the films are provided by Goodfellow.
- the membranes tested are in the form of a film with an active surface area of 14 cm 2 and the thickness of which is shown in table 1 below.
- PMP polymethylpentene
- PMMA polymethyl methacrylate
- PPO poly(phenylene oxide)
- Permeability is generally expressed in Barrer (10 10 .cm 3 (STP).cm.cm 2 .s _1 .cm Hg 1 ) according to the conversion:
- the permeability of a compound through a material from the material data (surface area, thickness), the pressure difference across the membrane and the measurement of the permeate flow rate through the membrane .
- Permeability is thus measured by maintaining a compound under pressure upstream of the membrane in the absence of an outlet on the retentate side, and measuring the flow rate of this same compound at atmospheric pressure on the permeate side.
- the pressure difference corresponds to the difference between the pressure upstream of the membrane and the pressure downstream of it, here the atmospheric pressure.
- the tests are carried out at a temperature of 25°C except for silicone, the tests of which were carried out at 35°C. The tests are repeated several times possibly at different pressures to obtain a more precise permeability value. Unless otherwise stated, the permeability remains constant whatever the DeltaP (i.e. the pressure difference across the membrane).
- H2 hydrogen
- HFC-236ea 1,1,1,2,3,3-hexafluoropropane
- the membrane used is polypropylene, polymethylpentene, poly(phenylene oxide), polyimide.
- the results are shown in table 2 below.
- the permeability value is expressed in Barrer.
- the selectivity mentioned in the table corresponds to the ratio between the permeability measured for the two species considered.
- polyolefin or polyether membranes are more permeable to hydrogen than to 1,1,1,2,3,3-hexafluoropropane.
- Polyolefin (polypropylene, polyethylene or polymethylpentene) or polyether type membranes therefore make it possible to effectively separate hydrogen from HFC-236ea.
- polyolefin membranes are permeable to nitrogen or oxygen rather than 1,1,1,2,3,3-hexafluoropropane. Similar results were obtained with a PPO membrane.
- polyolefin and polyether membranes make it possible to separate nitrogen and oxygen from 1,1,1,2,3,3-hexafluoropropane.
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Abstract
Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2207139A FR3137845B1 (fr) | 2022-07-12 | 2022-07-12 | Procédé de purification du 1,1,1,2,3,3-hexafluoropropane |
| PCT/FR2023/051033 WO2024013443A1 (fr) | 2022-07-12 | 2023-07-05 | Procédé de purification du 1,1,1,2,3,3-hexafluoropropane |
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| Publication Number | Publication Date |
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| EP4554708A1 true EP4554708A1 (fr) | 2025-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| EP23751052.4A Pending EP4554708A1 (fr) | 2022-07-12 | 2023-07-05 | Procédé de purification du 1,1,1,2,3,3-hexafluoropropane |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4554708A1 (fr) |
| KR (1) | KR20250037466A (fr) |
| CN (1) | CN119486799A (fr) |
| FR (1) | FR3137845B1 (fr) |
| WO (1) | WO2024013443A1 (fr) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118108570A (zh) * | 2024-01-24 | 2024-05-31 | 浙江衢化氟化学有限公司 | 一种由1,1,2,3,3,3-六氟丙烯生产2,3,3,3-四氟丙烯的方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US539600A (en) | 1895-05-21 | Automatic stud-turning machine | ||
| JP3158440B2 (ja) | 1992-06-05 | 2001-04-23 | ダイキン工業株式会社 | 1,1,1,2,3−ペンタフルオロプロペンの製造方法及び1,1,1,2,3−ペンタフルオロプロパンの製造方法 |
| JP3369604B2 (ja) | 1992-09-04 | 2003-01-20 | ダイキン工業株式会社 | 1,1,1,2,3,3−ヘキサフルオロプロパンの製造方法及びテトラフルオロクロロプロペンの製造方法 |
| US5563304A (en) | 1994-05-26 | 1996-10-08 | E. I. Du Pont De Nemours And Company | Production of 1,2-dihydro and 2,2-dihydro hexafluoropropanes and azeotropes thereof with HF |
| JP3543863B2 (ja) * | 1994-12-16 | 2004-07-21 | ダイキン工業株式会社 | 1,1,1,2,3,3−ヘキサフルオロプロパンの製造方法 |
| FR2731701B1 (fr) | 1995-03-17 | 1997-04-30 | Atochem Elf Sa | Procede de fabrication de fluoroalcanes |
| ATE548624T1 (de) | 2008-05-30 | 2012-03-15 | Diehl Bgt Defence Gmbh & Co Kg | Waffensystem mit hülsenloser munition |
| FR2948362B1 (fr) | 2009-07-23 | 2012-03-23 | Arkema France | Procede de preparation de composes fluores |
| MX2016000125A (es) * | 2013-07-12 | 2016-05-31 | Arkema Inc | Metodo de separacion de compuestos organofluorados utilizando membrana. |
| FR3067347B1 (fr) * | 2017-06-09 | 2020-07-24 | Arkema France | 1,1,1,2,3,3-hexafluoropropane de haute purete, son procede de fabrication et utilisation |
| JP2021523884A (ja) * | 2018-05-16 | 2021-09-09 | エスアールエフ リミテッド | 1234yfを含むオレフィン供給物の精製のための方法 |
-
2022
- 2022-07-12 FR FR2207139A patent/FR3137845B1/fr active Active
-
2023
- 2023-07-05 CN CN202380051981.XA patent/CN119486799A/zh active Pending
- 2023-07-05 KR KR1020257000953A patent/KR20250037466A/ko active Pending
- 2023-07-05 EP EP23751052.4A patent/EP4554708A1/fr active Pending
- 2023-07-05 WO PCT/FR2023/051033 patent/WO2024013443A1/fr not_active Ceased
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| Publication number | Publication date |
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| CN119486799A (zh) | 2025-02-18 |
| KR20250037466A (ko) | 2025-03-17 |
| FR3137845A1 (fr) | 2024-01-19 |
| FR3137845B1 (fr) | 2025-07-18 |
| WO2024013443A1 (fr) | 2024-01-18 |
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