WO2022185879A1 - フッ化水素ガス除去装置及びフッ化水素ガスの除去方法 - Google Patents
フッ化水素ガス除去装置及びフッ化水素ガスの除去方法 Download PDFInfo
- Publication number
- WO2022185879A1 WO2022185879A1 PCT/JP2022/005422 JP2022005422W WO2022185879A1 WO 2022185879 A1 WO2022185879 A1 WO 2022185879A1 JP 2022005422 W JP2022005422 W JP 2022005422W WO 2022185879 A1 WO2022185879 A1 WO 2022185879A1
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- WIPO (PCT)
- Prior art keywords
- hydrogen fluoride
- gas
- fluoride gas
- removal
- remover
- Prior art date
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- 239000007789 gas Substances 0.000 title claims abstract description 666
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 title claims abstract description 468
- 229910000040 hydrogen fluoride Inorganic materials 0.000 title claims abstract description 467
- 238000000034 method Methods 0.000 title claims abstract description 71
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 318
- 238000007599 discharging Methods 0.000 claims abstract description 16
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 41
- 235000013024 sodium fluoride Nutrition 0.000 claims description 20
- 239000011775 sodium fluoride Substances 0.000 claims description 20
- 229910052731 fluorine Inorganic materials 0.000 claims description 18
- 239000011737 fluorine Substances 0.000 claims description 18
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 16
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 15
- 239000003463 adsorbent Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 0.000 claims description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 9
- 239000011698 potassium fluoride Substances 0.000 claims description 9
- AHLATJUETSFVIM-UHFFFAOYSA-M rubidium fluoride Chemical compound [F-].[Rb+] AHLATJUETSFVIM-UHFFFAOYSA-M 0.000 claims description 9
- OMRRUNXAWXNVFW-UHFFFAOYSA-N fluoridochlorine Chemical compound ClF OMRRUNXAWXNVFW-UHFFFAOYSA-N 0.000 claims description 8
- QKCGXXHCELUCKW-UHFFFAOYSA-N n-[4-[4-(dinaphthalen-2-ylamino)phenyl]phenyl]-n-naphthalen-2-ylnaphthalen-2-amine Chemical compound C1=CC=CC2=CC(N(C=3C=CC(=CC=3)C=3C=CC(=CC=3)N(C=3C=C4C=CC=CC4=CC=3)C=3C=C4C=CC=CC4=CC=3)C3=CC4=CC=CC=C4C=C3)=CC=C21 QKCGXXHCELUCKW-UHFFFAOYSA-N 0.000 claims description 7
- 235000003270 potassium fluoride Nutrition 0.000 claims description 7
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 claims description 7
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 claims description 7
- NXHILIPIEUBEPD-UHFFFAOYSA-H tungsten hexafluoride Chemical compound F[W](F)(F)(F)(F)F NXHILIPIEUBEPD-UHFFFAOYSA-H 0.000 claims description 7
- SANRKQGLYCLAFE-UHFFFAOYSA-H uranium hexafluoride Chemical compound F[U](F)(F)(F)(F)F SANRKQGLYCLAFE-UHFFFAOYSA-H 0.000 claims description 7
- TVVNZBSLUREFJN-UHFFFAOYSA-N 2-(4-chlorophenyl)sulfanyl-5-nitrobenzaldehyde Chemical compound O=CC1=CC([N+](=O)[O-])=CC=C1SC1=CC=C(Cl)C=C1 TVVNZBSLUREFJN-UHFFFAOYSA-N 0.000 claims description 6
- KNSWNNXPAWSACI-UHFFFAOYSA-N chlorine pentafluoride Chemical compound FCl(F)(F)(F)F KNSWNNXPAWSACI-UHFFFAOYSA-N 0.000 claims description 6
- HLEOJHXJJVUGLR-UHFFFAOYSA-N heptafluoro-$l^{7}-bromane Chemical compound FBr(F)(F)(F)(F)(F)F HLEOJHXJJVUGLR-UHFFFAOYSA-N 0.000 claims description 6
- XRURPHMPXJDCOO-UHFFFAOYSA-N iodine heptafluoride Chemical compound FI(F)(F)(F)(F)(F)F XRURPHMPXJDCOO-UHFFFAOYSA-N 0.000 claims description 6
- VJUJMLSNVYZCDT-UHFFFAOYSA-N iodine trifluoride Chemical compound FI(F)F VJUJMLSNVYZCDT-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- QHMQWEPBXSHHLH-UHFFFAOYSA-N sulfur tetrafluoride Chemical compound FS(F)(F)F QHMQWEPBXSHHLH-UHFFFAOYSA-N 0.000 claims description 6
- FQFKTKUFHWNTBN-UHFFFAOYSA-N trifluoro-$l^{3}-bromane Chemical compound FBr(F)F FQFKTKUFHWNTBN-UHFFFAOYSA-N 0.000 claims description 6
- MZFRHHGRNOIMLW-UHFFFAOYSA-J uranium(4+);tetrafluoride Chemical compound F[U](F)(F)F MZFRHHGRNOIMLW-UHFFFAOYSA-J 0.000 claims description 6
- OYLGJCQECKOTOL-UHFFFAOYSA-L barium fluoride Chemical compound [F-].[F-].[Ba+2] OYLGJCQECKOTOL-UHFFFAOYSA-L 0.000 claims description 5
- 229910001632 barium fluoride Inorganic materials 0.000 claims description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 5
- 238000003682 fluorination reaction Methods 0.000 claims description 5
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 4
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 4
- CEBDXRXVGUQZJK-UHFFFAOYSA-N 2-methyl-1-benzofuran-7-carboxylic acid Chemical compound C1=CC(C(O)=O)=C2OC(C)=CC2=C1 CEBDXRXVGUQZJK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 description 73
- 238000011069 regeneration method Methods 0.000 description 73
- 239000011261 inert gas Substances 0.000 description 18
- 238000003860 storage Methods 0.000 description 11
- 230000001172 regenerating effect Effects 0.000 description 10
- 238000011049 filling Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 6
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000003795 desorption Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- 229910052770 Uranium Inorganic materials 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001512 metal fluoride Inorganic materials 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 150000003839 salts Chemical group 0.000 description 3
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 150000002221 fluorine Chemical class 0.000 description 2
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910016036 BaF 2 Inorganic materials 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910004014 SiF4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010332 dry classification Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- PJIYEPACCBMRLZ-UHFFFAOYSA-N iodine pentafluoride Chemical compound FI(F)(F)(F)F PJIYEPACCBMRLZ-UHFFFAOYSA-N 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000002627 tracheal intubation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/06—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/08—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds according to the "moving bed" method
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0446—Means for feeding or distributing gases
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- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
- B01D53/685—Halogens or halogen compounds by treating the gases with solids
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
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- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/046—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing halogens, e.g. halides
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
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- B01D2253/10—Inorganic adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
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- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
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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
- B01D2257/55—Compounds of silicon, phosphorus, germanium or arsenic
- B01D2257/553—Compounds comprising hydrogen, e.g. silanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D2258/02—Other waste gases
- B01D2258/0216—Other waste gases from CVD treatment or semi-conductor manufacturing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/30—Capture or disposal of greenhouse gases of perfluorocarbons [PFC], hydrofluorocarbons [HFC] or sulfur hexafluoride [SF6]
Definitions
- the present invention relates to a hydrogen fluoride gas removal device and a hydrogen fluoride gas removal method.
- Fluorine gas and chlorine trifluoride used in the manufacture of semiconductors, and uranium hexafluoride used in the manufacture of uranium fuel for nuclear power generation may contain hydrogen fluoride gas as an impurity, so remove it. Removal of hydrogen fluoride gas using an agent is performed.
- Patent Literatures 1, 2, and 3 disclose techniques for removing hydrogen fluoride gas from fluorine gas by allowing the hydrogen fluoride gas to be adsorbed on sodium fluoride.
- the present invention provides a hydrogen fluoride gas removal apparatus and a hydrogen fluoride gas removal apparatus in which adhesion of the removal agent is unlikely to occur when removing hydrogen fluoride gas from a mixed gas containing hydrogen fluoride gas using a removal agent.
- An object of the present invention is to provide a gas removal method.
- a hydrogen fluoride gas removal apparatus for removing hydrogen fluoride gas from a mixed gas containing hydrogen fluoride gas and another type of gas
- a removal agent for removing the hydrogen fluoride gas from the mixed gas can be accommodated, a gas introduction port into which the mixed gas is introduced, and the mixture subjected to processing to remove the hydrogen fluoride gas a gas outlet through which gas is discharged, and a hydrogen fluoride gas removal processor that performs a process of removing the hydrogen fluoride gas from the mixed gas by bringing the mixed gas into contact with the removing agent; a remover supplier that supplies the remover to the hydrogen fluoride gas removal processor; a remover mover for moving the remover housed in the hydrogen fluoride gas removal apparatus within the hydrogen fluoride gas removal apparatus; a removing agent discharger for discharging from the hydrogen fluoride gas removal treatment machine the used removal agent used in the treatment of removing the hydrogen fluoride gas
- the adsorbent is at least one selected from the group consisting of lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, cesium fluoride, magnesium fluoride, calcium fluoride, and barium fluoride.
- a hydrogen fluoride gas removal apparatus according to a certain [3]. [5] Described in [3] or [4], comprising a temperature control unit for a hydrogen fluoride gas removal processor that controls the temperature of the removing agent in the hydrogen fluoride gas removal treatment device to ⁇ 30° C. or higher and 100° C. or lower. of hydrogen fluoride gas removal equipment.
- the hydrogen fluoride gas remover according to any one of [1] to [5], wherein the removing agent is a powder having an average particle size of 10 ⁇ m or more and 10 mm or less.
- the other type of gas is fluorine gas, chlorine monofluoride, chlorine trifluoride, chlorine pentafluoride, bromine trifluoride, bromine pentafluoride, bromine heptafluoride, iodine trifluoride, pentafluoride At least one selected from the group consisting of iodine, iodine heptafluoride, uranium tetrafluoride, uranium hexafluoride, tungsten hexafluoride, silicon tetrafluoride, nitrogen trifluoride, and sulfur tetrafluoride [ 1] The hydrogen fluoride gas removal device according to any one of [6]. [8] The hydrogen fluoride gas remover according to any one of [1] to
- a hydrogen fluoride gas removal method for removing hydrogen fluoride gas from a mixed gas containing hydrogen fluoride gas and another type of gas comprising: a removing agent supply step of supplying a removing agent for removing the hydrogen fluoride gas from the mixed gas to a hydrogen fluoride gas removal processor that performs a process for removing the hydrogen fluoride gas from the mixed gas; The mixed gas is introduced into the gas inlet of the hydrogen fluoride gas removal processor containing the remover, and the remover is moved within the hydrogen fluoride gas removal processor to remove the hydrogen fluoride gas.
- the mixed gas is discharged from the gas outlet of the hydrogen fluoride gas removal processor to remove the hydrogen fluoride gas from the mixed gas.
- the adsorbent is at least one selected from the group consisting of lithium fluoride, sodium fluoride, potassium fluoride, rubidium fluoride, cesium fluoride, magnesium fluoride, calcium fluoride, and barium fluoride.
- the fluorination according to [11] or [12], wherein in the hydrogen fluoride gas removal treatment step, the temperature of the remover in the hydrogen fluoride gas removal treatment machine is -30 ° C. or higher and 100 ° C. or lower.
- a method for removing hydrogen gas is -30 ° C. or higher.
- the other type of gas is fluorine gas, chlorine monofluoride, chlorine trifluoride, chlorine pentafluoride, bromine trifluoride, bromine pentafluoride, bromine heptafluoride, iodine trifluoride, pentafluoride At least one selected from the group consisting of iodine, iodine heptafluoride, uranium tetrafluoride, uranium hexafluoride, tungsten hexafluoride, silicon tetrafluoride, nitrogen trifluoride, and sulfur tetrafluoride [ 9] The method for removing hydrogen fluoride gas according to any one of [14]. [16] The method for removing hydrogen fluoride gas according to any one of [14
- adhesion of the removing agent is less likely to occur when the removal treatment is performed to remove the hydrogen fluoride gas from the mixed gas containing the hydrogen fluoride gas using the removing agent.
- the hydrogen fluoride gas removal apparatus is a hydrogen fluoride gas removal apparatus that removes hydrogen fluoride gas from a mixed gas containing hydrogen fluoride gas (HF) and other types of gases.
- This hydrogen fluoride gas removal apparatus includes a hydrogen fluoride gas removal processor for removing hydrogen fluoride gas from a mixed gas, and a hydrogen fluoride gas removal treatment device for removing hydrogen fluoride gas from a mixed gas.
- a removing agent supply device that supplies the hydrogen fluoride gas to the machine, a removing agent moving device that moves the removing agent contained in the hydrogen fluoride gas removal treatment device within the hydrogen fluoride gas removal treatment device, and a removal agent mixing in the hydrogen fluoride gas removal treatment device and a removing agent discharger for discharging the used removing agent used in the process of removing hydrogen fluoride gas from the gas from the hydrogen fluoride gas removal processing device.
- the hydrogen fluoride gas removal processor can accommodate a removing agent, and has a gas inlet for introducing a mixed gas and a gas for discharging the mixed gas that has been subjected to a treatment to remove the hydrogen fluoride gas. and an outlet.
- the hydrogen fluoride gas removal processor can remove the hydrogen fluoride gas from the mixed gas by bringing the mixed gas into contact with the removing agent.
- the hydrogen fluoride gas removal apparatus is provided with the removing agent moving device, the hydrogen fluoride gas removing device is moved within the hydrogen fluoride gas removing device by the removing agent moving device.
- the removing agent moving device By bringing the mixed gas into contact with the removing agent, a process for removing the hydrogen fluoride gas from the mixed gas can be performed.
- remover movers include screw feeders and screw conveyors.
- the hydrogen fluoride gas removal method is a hydrogen fluoride gas removal method for removing hydrogen fluoride gas from a mixed gas containing hydrogen fluoride gas and other types of gases.
- This method for removing hydrogen fluoride gas includes supplying a remover for removing hydrogen fluoride gas from a mixed gas to a hydrogen fluoride gas removal processor that performs a process for removing hydrogen fluoride gas from a mixed gas.
- the mixed gas is introduced into the gas inlet of the hydrogen fluoride gas removal treatment machine containing the removing agent, and the removal agent is moved in the hydrogen fluoride gas removal treatment machine to remove the fluorinated gas.
- the removal process for removing hydrogen fluoride gas from a mixed gas containing hydrogen fluoride gas is performed using hydrogen fluoride gas. Since the removing agent can be moved in the gas removing apparatus, adhesion of the removing agent is less likely to occur during the removal treatment. As a result, clogging of the remover due to adhesion is less likely to occur, so that the mixed gas flow path in the hydrogen fluoride gas removal apparatus is always secured without clogging. In addition, since the removing agents are unlikely to block each other, it is easy to discharge the used removing agent from the hydrogen fluoride gas removal processor.
- the hydrogen fluoride gas removal apparatus and the hydrogen fluoride gas removal method according to the present embodiment can be used with fluorine gas (F 2 ), chlorine monofluoride (ClF), and chlorine trifluoride ( ClF 3 ), chlorine pentafluoride (ClF 5 ), bromine trifluoride (BrF 3 ), bromine pentafluoride (BrF 5 ), bromine heptafluoride (BrF 7 ), iodine trifluoride (IF 3 ), iodine fluoride ( IF5 ), iodine heptafluoride ( IF7 ), tungsten hexafluoride ( WF6 ), silicon tetrafluoride ( SiF4 ), nitrogen trifluoride (NF3) , and sulfur tetrafluoride ( SF 4 ), and uranium tetrafluoride (UF 4 ) and uranium hexafluoride (UF 6 ) used in the
- the removing agent is moved in the hydrogen fluoride gas removal processing machine, and mixed with the removal agent moving in the hydrogen fluoride gas removal processing machine.
- the removal agent is brought into contact with the gas, but the mode of movement of the removal agent is not particularly limited. You can move it in the shape of
- the movement of the remover in the hydrogen fluoride gas removal processor is controlled by the supply of the remover. It is preferable to move from the side of the removing agent supply port toward the side of the removing agent discharge port through which the removing agent is discharged.
- the speed of movement of the remover in the hydrogen fluoride gas removal processor should be adjusted to the space described later. It is more preferred to control the speed, and even more preferred to move the remover at a substantially constant speed as if a fluid is flowing.
- the moving speed of the removing agent moving in the hydrogen fluoride gas removal processor is preferably 0.05/h or more and 3000/h or less, and preferably 0.1/h or more and 1000/h or less, in space velocity. More preferably, it is 1/h or more and 200/h or less. If the space velocity of the removing agent is within the above range, adhesion of the removing agent is less likely to occur during the removing treatment.
- the type of remover is not particularly limited as long as it can remove hydrogen fluoride gas from the mixed gas. For example, it may be an adsorbent that adsorbs and removes hydrogen fluoride gas, It may be a reactive agent that reacts with hydrogen fluoride gas to be removed.
- adsorbents include activated carbon, silica gel, zeolite, molecular sieves, etc. Lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), rubidium fluoride (RbF ), cesium fluoride (CsF), magnesium fluoride (MgF 2 ), calcium fluoride (CaF 2 ), and barium fluoride (BaF 2 ). Since these metal fluorides such as sodium fluoride and hydrogen fluoride form a salt bonded by hydrogen bonding, the metal fluoride can be used as an adsorbent for hydrogen fluoride gas. Among the above metal fluorides, sodium fluoride and potassium fluoride are more preferred as adsorbents.
- the shape of the removing agent is not particularly limited as long as it can maintain a solid state at the temperature of the removing agent during the hydrogen fluoride gas removal treatment step, but the average particle size is 10 ⁇ m or more and 10 mm or less. It is more preferable that the particles have an average particle size of 20 ⁇ m or more and 1 mm or less.
- the average particle size is 10 mm or less, the contact area between the hydrogen fluoride gas and the remover is sufficiently large, so the removal rate of the hydrogen fluoride gas tends to be high.
- the average particle diameter is 10 ⁇ m or more, the removing agent is less likely to be mixed into the mixed gas after removing the hydrogen fluoride gas.
- the average particle size of the remover can be measured by, for example, a laser diffraction particle size distribution analyzer or a dry classification method.
- the type of other gas contained in the mixed gas together with hydrogen fluoride gas is not particularly limited as long as it is a gas other than hydrogen fluoride gas, but examples include fluorine gas, chlorine monofluoride, chlorine trifluoride, chlorine pentafluoride, bromine trifluoride, bromine pentafluoride, bromine heptafluoride, iodine trifluoride, iodine pentafluoride, iodine heptafluoride, uranium tetrafluoride, uranium hexafluoride, At least one selected from the group consisting of tungsten hexafluoride, silicon tetrafluoride, nitrogen trifluoride, and sulfur tetrafluoride.
- the hydrogen fluoride gas can be removed from the mixed gas to obtain the other types of gases with high purity.
- the high-purity gas of the other kind can be used as a material gas for manufacturing semiconductors or as a gas for manufacturing uranium fuel for nuclear power generation.
- the concentration of the hydrogen fluoride gas in the mixed gas is not particularly limited, it is preferably 20% by volume or less, more preferably 10% by volume or less. If the mixed gas has a hydrogen fluoride gas concentration within the above range, the hydrogen fluoride gas can be removed economically without using a large-sized hydrogen fluoride gas remover.
- the temperature of the removing agent in the hydrogen fluoride gas removing apparatus in the hydrogen fluoride gas removing treatment step is not particularly limited as long as the removing agent can remove the hydrogen fluoride gas from the mixed gas.
- the temperature is preferably ⁇ 30° C. or higher and 100° C. or lower, more preferably ⁇ 10° C. or higher and 50° C. or lower. If the temperature is -30°C or higher, a small amount of energy is sufficient for cooling. Also, if the temperature is 100° C. or less, the hydrogen fluoride gas removal rate tends to be high.
- the temperature of the remover in the hydrogen fluoride gas removal processor can be controlled by the hydrogen fluoride gas removal processor temperature control unit provided in the hydrogen fluoride gas removal device.
- the method for measuring the temperature of the remover in the hydrogen fluoride gas removal processor is not particularly limited, but it can be measured, for example, by inserting a thermocouple in the hydrogen fluoride gas removal processor.
- the hydrogen fluoride gas removal apparatus shown in FIG. a removing agent supply device 20; a removing agent moving device that moves the removing agent contained in the hydrogen fluoride gas removing device 10 within the hydrogen fluoride gas removing device 10; A removing agent discharger that discharges the used removing agent used in the process of removing hydrogen fluoride gas from the mixed gas from the hydrogen fluoride gas removal processing device 10, and a removal that applies regeneration processing to the used removing agent.
- An agent regeneration processor 30 and a recycled removing agent transporter 40 for transporting the recycled removing agent and supplying it to the removing agent supply device 20 are provided.
- the hydrogen fluoride gas removal processor 10 has a cylindrical shape, and is capable of accommodating a removing agent inside.
- the hydrogen fluoride gas removal processor 10 also includes a rotary screw 13 in which a spirally continuous helical blade 11 protrudes radially outward from the outer peripheral surface of a rod-shaped rotary shaft member 12 .
- the rotating screw 13 is installed in the hydrogen fluoride gas removing device 10 so that the rotating shaft member 12 is coaxial with the central axis of the cylindrical hydrogen fluoride gas removing device 10 .
- the remover in the hydrogen fluoride gas removal processor 10 By rotating with , the remover in the hydrogen fluoride gas removal processor 10 can be stirred, and the remover in the hydrogen fluoride gas removal processor 10 can be stirred by It can be moved from one end side to the other end side in the central axis direction of the processing machine 10 .
- the rotating screw 13 and the motor 14 correspond to members constituting the remover mover.
- the hydrogen fluoride gas removal processor 10 is a moving bed type processor.
- the hydrogen fluoride gas removal processor 10 has a removing agent supply port 17 for supplying the removing agent and a removing agent discharge port 18 for discharging the removing agent.
- the removing agent supply port 17 is provided on one end side of the hydrogen fluoride gas removal apparatus 10 in the central axis direction, and the removing agent discharge port 18 is provided on the other side of the hydrogen fluoride gas removal apparatus 10 in the central axis direction. ing.
- the removing agent is supplied into the hydrogen fluoride gas removing apparatus 10 through the removing agent supply port 17 by the removing agent supply device 20.
- the removing agent supply device 20 will be described in detail later.
- the hydrogen fluoride gas removal processor 10 has a gas inlet 15 for introducing the mixed gas and a gas outlet 16 for discharging the mixed gas from which the hydrogen fluoride gas has been removed. ing.
- the gas inlet 15 is provided on the other end side of the hydrogen fluoride gas removal processor 10 in the central axis direction, and the gas discharge port 16 is provided on the one end side of the hydrogen fluoride gas removal treatment machine 10 in the central axis direction. .
- the removing agent is supplied into the hydrogen fluoride gas removing device 10 from the removing agent supply port 17 provided on the left end side of the hydrogen fluoride gas removing device 10, and the rotating screw 13 (that is, the removing agent mover) is sent toward the right end side of the hydrogen fluoride gas removal processor 10 .
- the mixed gas is introduced into the hydrogen fluoride gas removal processor 10 from a gas inlet 15 provided on the right end side of the hydrogen fluoride gas removal processor 10 and flows toward the left end side of the hydrogen fluoride gas removal processor 10. flow.
- the hydrogen fluoride gas removal processor 10 includes a hydrogen fluoride gas removal processor temperature control unit (not shown) for controlling the temperature of the remover in the hydrogen fluoride gas removal processor 10.
- the process for removing the hydrogen fluoride gas from the substrate can be performed at a desired temperature (for example, -30° C. or higher and 100° C. or lower).
- thermocouple for measuring the temperature of the remover in the hydrogen fluoride gas removal processor 10 is not particularly limited, but for example, the thermocouple may be inserted into the rotary shaft member 12 of the rotary screw 13 ( That is, the rotating shaft member 12 of the rotating screw 13 may be used as an internal tube for the thermocouple.).
- the removing agent and the mixed gas move in opposite directions (counterflow), but they may move in the same direction (cocurrent flow).
- the mixed gas (mainly fluorine gas) that has undergone a process to remove hydrogen fluoride gas is discharged from the gas outlet 16 to the outside of the hydrogen fluoride gas removal processor 10 .
- the used removing agent removing agent that has adsorbed the hydrogen fluoride gas
- the used remover is sent toward the right end of the hydrogen fluoride gas remover 10 by the rotating screw 13, and is discharged out of the hydrogen fluoride gas remover 10 through the remover outlet 18 as it is. be done.
- the rotating screw 13 and the motor 14 correspond to members constituting the removing agent discharger.
- the rotating screw 13 and the motor 14 serve as both a remover mover and a remover discharger.
- the removing agent moving device and the removing agent discharging device are configured to be the same device, but the removing agent moving device and the removing agent discharging device may be configured to be separate devices.
- the hydrogen fluoride gas removal processor 10 may have a structure that prevents the mixed gas from flowing backward from the removing agent supply port 17 and being discharged outside the hydrogen fluoride gas removal processor 10 .
- the hydrogen fluoride gas removal processor 10 has a structure that suppresses the removal agent discharged from the removal agent discharge port 18 from being accompanied by the mixed gas and discharged outside the hydrogen fluoride gas removal treatment device 10. You may have
- the used remover discharged from the remover discharge port 18 is transferred to the remover regeneration processor 30 .
- the removing agent regeneration processor 30 has a tubular shape, and is capable of containing the used removing agent inside. Further, the removing agent regeneration processor 30 has a rotating shaft member 32 in which spirally continuous spiral blades 31 protrude radially outward from the outer peripheral surface of a rod-shaped rotating shaft member 32, as in the hydrogen fluoride gas removing processor 10.
- a screw 33 is provided.
- the rotating screw 33 is installed in the removing agent regeneration processor 30 so that the rotating shaft member 32 is coaxial with the central axis of the cylindrical removing agent regeneration processor 30 , and the rotating screw 33 is rotated by the motor 34 .
- the remover in the removing agent regeneration processor 30 can be agitated, and the remover in the removing agent regeneration processor 30 is moved toward the other end of the removing agent regeneration processor 30 in the central axis direction. can be moved toward one end side.
- the removing agent regeneration processor 30 has a used removing agent supply port 37 to which the used removing agent is supplied, and a recycled removing agent discharge port 38 to which the recycled removing agent is discharged. ing.
- the used removing agent supply port 37 is provided at the other end of the removing agent regeneration processor 30 in the central axis direction, and the recycled removing agent discharge port 38 is provided at one end of the removing agent regeneration processor 30 in the central axis direction. It is Since the removing agent discharge port 18 of the hydrogen fluoride gas removal processor 10 and the used removing agent supply port 37 of the removing agent regeneration processing device 30 are connected, the used removing agent discharged from the removing agent discharge port 18 is removed. The agent is supplied into the removing agent regenerating machine 30 from the used removing agent supply port 37 .
- the removing agent regeneration processor 30 includes a gas inlet 35 into which an inert gas such as nitrogen gas is introduced, and a hydrogen fluoride mixed inert gas in which the hydrogen fluoride gas desorbed from the removing agent and the inert gas are mixed. and a gas outlet 36 through which gas is discharged.
- the gas inlet port 35 is provided on one end side of the removing agent regeneration processor 30 in the central axis direction, and the gas discharge port 36 is provided on the other end side of the removing agent regeneration processor 30 in the central axis direction.
- the removing agent regeneration processor 30 is equipped with a removing agent regeneration processor temperature control unit that controls the temperature of the removing agent in the removing agent regeneration processor 30 .
- a heater 39 and a thermocouple are provided as a temperature control unit for the removing agent regeneration processor, so that the temperature of the removing agent in the removing agent regeneration processor 30 is controlled to a desired temperature. It is possible to do so.
- the thermocouple installation location is not particularly limited. It may also be used as an intubation.)
- the temperature of the remover in the remover regeneration processor 30 in the remover regeneration treatment step is not particularly limited as long as the used remover can be regenerated with improved hydrogen fluoride gas removal performance.
- the temperature is preferably 150° C. or higher and 400° C. or lower, more preferably 200° C. or higher and 350° C. or lower. If the temperature is 150° C. or higher, the hydrogen fluoride gas can be sufficiently desorbed from the adsorbent, so that the hydrogen fluoride gas removal performance of the used remover can be sufficiently improved. If the temperature is 400° C. or lower, the used removing agent can be economically regenerated, and the removing agent regeneration processor 30 is less likely to deteriorate.
- the used remover is supplied into the remover regeneration processor 30 from a used remover supply port 37 provided on the right end side of the remover regeneration processor 30, and is rotated by the rotating screw 33. It is sent toward the left end side of the remover regeneration processor 30 . Then, the used remover in the remover regeneration processor 30 is heated by the temperature control unit for the remover regeneration processor, and subjected to a regeneration process to improve the hydrogen fluoride gas removal performance (hydrogen fluoride gas desorbs from the remover).
- the inert gas is introduced into the removing agent regeneration processor 30 from a gas inlet 35 provided on the left end side of the removing agent regeneration processing device 30 and flows toward the right end side of the removing agent regeneration processing device 30 .
- the removing agent is regenerated in the removing agent regeneration processor 30, the hydrogen fluoride gas is desorbed from the removing agent, and the used removing agent becomes a regenerated removing agent.
- the removing agent and the inert gas move in opposite directions, but they may move in the same direction.
- the hydrogen fluoride gas detached from the remover is mixed with an inert gas to form a hydrogen fluoride mixed inert gas, which is discharged from the remover regenerator 30 through the gas outlet 36 .
- the regenerated removing agent is discharged from the regenerated removing agent discharge port 38 to the outside of the removing agent regenerating processor 30 .
- the removing agent regeneration processor 30 may have a structure that prevents the hydrogen fluoride mixed inert gas from flowing backward from the used removing agent supply port 37 and being discharged outside the removing agent regeneration processor 30 . . Further, in the removing agent regeneration processor 30, the regenerated removing agent discharged from the regenerated removing agent discharge port 38 is discharged out of the removing agent regeneration processing unit 30 together with the hydrogen fluoride mixed inert gas. You may have the structure which suppresses that.
- the regenerated removing agent discharged from the regenerated removing agent discharge port 38 is transported by the regenerated removing agent transporter 40 and supplied to the removing agent supply device 20 .
- the recycled removing agent transporter 40 connects the recovery tank 41 containing the recycled removing agent discharged from the recycled removing agent discharge port 38, the recovery tank 41 and the removing agent supply device 20, and performs regeneration. and a transport line 42 for transporting the treated removing agent from the collection tank 41 to the removing agent supplier 20 .
- the method of transporting the regenerated removing agent is not particularly limited.
- a method of pumping using a compressed gas such as compressed nitrogen gas or compressed air
- a screw feeder such as compressed nitrogen gas or compressed air
- a screw conveyor such as a screw conveyor
- a belt conveyor such as a belt conveyor
- a bucket conveyor A method of transporting using transport equipment such as.
- the regenerated removing agent can be transferred from the recovery tank 41 to the removing agent supplier 20 by flowing compressed nitrogen gas from the compressed gas source 43 through the transfer line 42 .
- the removing agent supply device 20 has a tubular shape and is capable of containing the removing agent inside. Further, in the removing agent supply device 20, similarly to the hydrogen fluoride gas removing device 10 and the removing agent regenerating device 30, the helical blades 21 continuous in a spiral shape extend radially outward from the outer peripheral surface of the rod-shaped rotary shaft member 22. It has a rotating screw 23 projecting in the direction. The rotating screw 23 is installed in the removing agent supplier 20 so that the rotating shaft member 22 is coaxial with the central axis of the cylindrical removing agent supplying device 20.
- the removing agent in the removing agent feeder 20 can be stirred, and the removing agent in the removing agent feeder 20 is moved from one end side toward the other end side in the central axis direction of the removing agent feeder 20. can be moved by pressing
- the removing agent supply device 20 has a removing agent supply port 27 for supplying the removing agent and a removing agent discharge port 28 for discharging the removing agent.
- the removing agent supply port 27 is provided on one end side of the removing agent supply device 20 in the central axis direction, and the removing agent discharge port 28 is provided on the other end side of the removing agent supply device 20 in the central axis direction.
- the removing agent supply machine 20 has a storage tank 25 for temporarily storing the removing agent, and the removing agent is supplied from the storage tank 25 to the removing agent supply port 27 of the removing agent supply machine 20 .
- the storage tank 25 may be provided with a window for visually confirming the amount of the remover contained therein.
- the remover supplied into the remover supplier 20 is fed by the rotary screw 23 from one end (the left end in FIG. 1) of the remover supplier 20 toward the other end (the right end in FIG. 1). be done.
- the removing agent discharge port 28 of the removing agent supply device 20 and the removing agent supply port 17 of the hydrogen fluoride gas removal processing device 10 are connected, the removing agent sent to the other end side of the removing agent supply device 20 is It is supplied to the hydrogen fluoride gas removal processor 10 through the removing agent outlet 28 and the removing agent supply port 17 .
- the supply speed of the remover supplied from the storage tank 25 into the hydrogen fluoride gas removal processor 10 must match the discharge speed of the used remover discharged from the hydrogen fluoride gas removal processor 10. . If the discharge speed of the used removing agent discharged from the hydrogen fluoride gas removing device 10 is faster, the filling rate of the removing agent in the hydrogen fluoride gas removing device 10 will decrease, so that the Hydrogen gas removal rate may be low. On the other hand, if the supply rate of the remover supplied from the storage tank 25 into the hydrogen fluoride gas removal processor 10 is higher, the filling rate of the remover in the hydrogen fluoride gas removal processor 10 will be higher. It is preferable to quantitatively withdraw the remover from the storage tank 25 using a rotary valve or the like. Instead of using the removing agent supply device 20, the removing agent may be supplied from the storage tank 25 into the hydrogen fluoride gas removal processing device 10 by the weight of the removing agent.
- the regenerated removing agent transported by the regenerated removing agent conveying machine 40 is put into the storage tank 25 of the removing agent supply machine 20, it is regenerated in the removing agent regenerating machine 30.
- the regenerated removing agent can be reused for removing hydrogen fluoride gas in the hydrogen fluoride gas removing apparatus 10 .
- both the unused removing agent and the regenerated removing agent can be supplied to the hydrogen fluoride gas removal treatment device. 10 can be used for removing hydrogen fluoride gas.
- a removing agent source 51 that supplies unused removing agent to the storage tank 25 of the removing agent supply device 20
- both the unused removing agent and the regenerated removing agent can be supplied to the hydrogen fluoride gas removal treatment device. 10 can be used for removing hydrogen fluoride gas.
- supplying the removed amount of removal agent from the removal agent source 51 to the storage tank 25 will restore the hydrogen fluoride gas removal apparatus.
- the amount of removing agent present in the entire system can be kept constant at all times.
- the process of removing hydrogen fluoride gas from the mixed gas and the process of regenerating the used removing agent can be performed in parallel. It is not necessary to stop the process of removing hydrogen fluoride gas from the mixed gas in order to perform the process of regenerating the used removing agent. Therefore, the process of removing the hydrogen fluoride gas from the mixed gas can be continuously performed over a long period of time without stopping.
- the removal process for removing the hydrogen fluoride gas from the mixed gas containing the hydrogen fluoride gas is performed while moving the remover in the hydrogen fluoride gas removal processor 10, Adhesion of the remover is less likely to occur in the hydrogen gas removal processor 10 . Therefore, clogging of the remover due to adhesion is less likely to occur, so that the flow path of the mixed gas in the hydrogen fluoride gas removal processor 10 is always secured without clogging.
- the removing agents are unlikely to block each other, it is easy to discharge the used removing agent from the hydrogen fluoride gas removing apparatus 10, and the removing treatment can be continuously performed for a long period of time without stopping. can.
- the hydrogen fluoride gas removal processor is a fixed-bed treatment device (that is, when the removing agent in the hydrogen fluoride gas removal processor 10 does not move during the removal treatment)
- the hydrogen fluoride gas removal treatment Among the removal agents in the machine, the removal agent placed near the gas inlet comes into contact with the mixed gas with a high concentration of hydrogen fluoride gas and adsorbs a large amount of hydrogen fluoride gas. change becomes greater. As a result, the removal agent placed in the vicinity of the gas inlet deteriorates quickly, and there is a possibility that the operation of the hydrogen fluoride gas removal apparatus will need to be stopped to frequently regenerate the removal agent.
- the hydrogen fluoride gas removal processor 10 shown in FIG. 1 is a moving bed type treatment device, a specific remover comes into contact with a mixed gas having a high concentration of hydrogen fluoride gas and removes a large amount of hydrogen fluoride gas. There is no adsorption. Therefore, the process of removing the hydrogen fluoride gas from the mixed gas can be continuously performed over a long period of time without stopping.
- the method of transporting the regenerated removing agent is pumping with compressed gas
- a gas extraction port 52 for discharging gas from the gas phase portion of the storage tank 25 .
- a filter 53 such as a bag filter on the pipe forming the gas extraction port 52 to remove fine particles from the gas discharged from the gas extraction port 52 to the outside of the hydrogen fluoride gas removal apparatus.
- the hydrogen fluoride gas removal processor 10 the rotating screw 13, the removing agent regeneration processor 30, the rotating screw 33, etc. come into contact with corrosive gases such as mixed gas and hydrogen fluoride gas, these gases It is preferable to form it with a material having corrosion resistance. Examples include stainless steel, Hastelloy (trademark), Monel (trademark), nickel, and the like.
- the inner diameter and length of the hydrogen fluoride gas removal processor 10 are not particularly limited, but the amount of the mixed gas supplied to the hydrogen fluoride gas removal processor 10 and the treatment to remove the hydrogen fluoride gas are performed. It is preferable to adjust based on the concentration of the hydrogen fluoride gas in the mixed gas before and the concentration of the hydrogen fluoride gas in the mixed gas after the treatment for removing the hydrogen fluoride gas.
- the concentration of hydrogen fluoride gas in the mixed gas before the treatment for removing hydrogen fluoride gas is 2% by volume or more and 15% by volume or less, and the mixture after the treatment for removing hydrogen fluoride gas is performed.
- the concentration of hydrogen fluoride gas in the gas is 1 ppm by volume or more and 100 ppm by volume or less, it is preferable that the following conditions are satisfied.
- the space volume V1 of the space between the removing agent supply port 17 and the removing agent discharge port 18 of the hydrogen fluoride gas removal processor 10 (unit is liter. However, the volume of the rotating screw 13 is subtracted from the volume ) is preferably a spatial volume V1 at which the space-time velocity (SV1) is 5/h or more and 600/h or less, more preferably 10/h or more and 200/h or less.
- SV1 space-time velocity
- the ratio of the inner diameter to the length (length/inner diameter) of the hydrogen fluoride gas removal processor 10 is preferably 5 or more and 500 or less, more preferably 10 or more and 50 or less.
- the inner diameter of the hydrogen fluoride gas removal processor 10 is not particularly limited as long as the rotating screw 13 can be installed, but is preferably 2 cm or more.
- the ratio V2/V1 (hereinafter sometimes referred to as "filling rate") between the volume V2 of the removing agent present in the space volume V1 and the space volume V1 is 0.3 or more and 0.9 or less. It is preferably 0.4 or more and 0.8 or less, and further preferably 0.6 or more and 0.8 or less.
- the hydrogen fluoride gas removal device Although it is possible to operate the hydrogen fluoride gas removal device even if each of the above values deviates from the respective preferable ranges, if the space-time velocity (SV1) is 5/h or more, the hydrogen fluoride gas removal device will not work. The size can be suppressed, and if the flow rate is 600/h or less, the hydrogen fluoride gas removal rate tends to increase.
- SV1 space-time velocity
- the hydrogen fluoride gas removal rate tends to be high. Since the length of the hydrogen gas removal processor 10 is suppressed, the rotation of the rotary screw 13 is less likely to be loaded. Furthermore, when the filling rate is 0.3 or more, the hydrogen fluoride gas removal rate tends to be high, and when it is 0.9 or less, the rotation of the rotary screw 13 is less likely to be loaded.
- the pressure in the hydrogen fluoride gas removal treatment device 10 in the hydrogen fluoride gas removal treatment step (hereinafter, pressure indicates absolute pressure unless otherwise specified) is preferably 0.01 MPa or more and 2 MPa or less, and 0 It is more preferably 0.05 MPa or more and 1 MPa or less, and further preferably 0.09 MPa or more and 0.15 MPa or less.
- the rotating shaft member 12 In order to rotate the rotating screw 13 by the motor 14, the rotating shaft member 12 passes through one end in the central axis direction of the hydrogen fluoride gas remover 10, so that the bearing portion of the rotating shaft member 12 generates hydrogen fluoride gas. In order to ensure airtightness inside the removal processor 10, it is desirable to prevent the pressure inside the hydrogen fluoride gas removal processor 10 from becoming too high.
- the pressure inside the hydrogen fluoride gas removal processor 10 can be measured, for example, with a pressure gauge installed inside the hydrogen fluoride gas removal processor 10 . Furthermore, by providing an opening adjustment valve at the gas discharge port 16 from which the mixed gas that has been subjected to the treatment to remove the hydrogen fluoride gas is discharged, and by interlocking the opening of the opening adjustment valve with the indication of the pressure gauge , the desired pressure can be maintained.
- the remover moves within the hydrogen fluoride gas removal processor 10, but the retention time of the remover in the hydrogen fluoride gas removal processor 10 is not particularly limited.
- the value obtained by dividing the flow F (1/h) of the removing agent by the spatial volume V1 (L) of the hydrogen fluoride gas removal processor 10 is 1/100 to 5 times the value of SV1 of the mixed gas. It is preferable to set the ratio as a guideline, and it is more preferable to set the ratio to 1/10 times or more and 1 time or less.
- the amount of hydrogen fluoride gas adsorbed by the removing agent in the vicinity of the gas inlet 15 of the hydrogen fluoride gas removal processor 10 becomes too large and is removed. The phenomenon that the agent adheres to the rotating screw 13 is less likely to occur.
- the value of SV1 of the mixed gas is five times or less, fine particles of the remover are less likely to be included in the mixed gas.
- the residence time of the removing agent can be determined based on the SV1 value of the mixed gas and the concentration of the hydrogen fluoride gas in the mixed gas. That is, the product of the SV1 value of the mixed gas and the concentration of the hydrogen fluoride gas in the mixed gas is the lower limit of the space-time velocity (SV2) of the removing agent, and the space-time velocity 10 times this lower limit is the removing agent is the preferred value of the space-time velocity (SV2).
- SV2 space-time velocity
- the size of the hydrogen fluoride gas removal processor 10 may be increased, or a plurality of hydrogen fluoride gas removal processors 10 may be used and installed in multiple stages (for example, two stages).
- a mixed gas having a hydrogen fluoride gas concentration higher than 15% by volume is supplied to the first stage hydrogen fluoride gas removal processor on the upstream side. 10 to reduce the concentration of hydrogen fluoride gas in the mixed gas to 15% by volume or less, and the mixed gas passed through the hydrogen fluoride gas removal treatment device 10 in the first stage is subjected to fluorination in the second stage on the downstream side.
- the hydrogen gas removal processor 10 By passing through the hydrogen gas removal processor 10, it is possible to obtain a mixed gas in which the concentration of hydrogen fluoride gas is reduced to 1 volume ppm or more and 100 volume ppm or less.
- the regenerated remover is supplied to the second stage hydrogen fluoride gas removal processor 10, and the second stage fluorination is performed.
- the remover discharged from the hydrogen gas removal processor 10 may be supplied to the first-stage hydrogen fluoride gas removal processor 10 without being subjected to regeneration treatment.
- hydrogen fluoride after cooling the mixed gas to reduce the concentration of hydrogen fluoride gas in the mixed gas or reducing the concentration of hydrogen fluoride gas in the mixed gas by distillation, hydrogen fluoride according to the present embodiment
- a gas removal device and a hydrogen fluoride gas removal method may be applied.
- the inner diameter and length of the removing agent regenerating device 30 are not particularly limited, but the amount of hydrogen fluoride contained in the used removing agent and the inert gas supplied to the removing agent regenerating device 30 and the temperature of the remover in the remover regenerator 30 .
- the removal speed of hydrogen fluoride gas in the hydrogen fluoride gas removal treatment step and the desorption speed of hydrogen fluoride gas in the remover regeneration treatment step may be made equal.
- the simplest example is:
- the hydrogen fluoride gas removal processor 10 and the removing agent regeneration treatment device 30 are made to have the same dimensions, the residence time of the removal agent in the hydrogen fluoride gas removal treatment device 10 and the removal agent regeneration treatment device 30 are made the same, and the fluorination In the mixed gas supplied to the hydrogen gas removal processor 10, the flow rate of the components other than hydrogen fluoride (that is, the other type of gas) and the flow rate of the inert gas supplied to the removing agent regeneration processor 30 are the same, and are removed. If the temperature of the remover in the agent regeneration processor 30 is 150° C. or higher and 400° C. or lower, the hydrogen fluoride gas removal rate in the hydrogen fluoride gas removal treatment step and the removal of the hydrogen fluoride gas in the remover regeneration treatment step are improved. Release velocity can be equalized.
- the flow rate of the inert gas supplied to the removing agent regeneration processor 30 is not particularly limited, and is compared with the flow rate of the components other than hydrogen fluoride in the mixed gas supplied to the hydrogen fluoride gas removal processor 10. may be equal, greater, or less, preferably less.
- the flow rate of the inert gas supplied to the removing agent regeneration processor 30 is 1/100 to 5 times the flow rate of the components other than hydrogen fluoride in the mixed gas supplied to the hydrogen fluoride gas removal processor 10. preferably 1/10 times or more and 1 time or less. If it is 1/100 times or more, the concentration of desorbed hydrogen fluoride gas contained in the hydrogen fluoride-mixed inert gas does not become too high, so the rate of desorption of hydrogen fluoride gas tends to increase. On the other hand, if it is 5 times or less, fine particles of the remover are less likely to be contained in the hydrogen fluoride mixed inert gas, so the amount of loss of the remover is reduced.
- the dimensions of the removing agent regeneration processor 30 are not particularly limited, and may be the same as or different from the dimensions of the hydrogen fluoride gas removal processor 10 . If the inner diameter is the same as that of the hydrogen fluoride gas removal treatment device 10 and the length is longer than that of the hydrogen fluoride gas removal treatment device 10, the removing agent can be regenerated more sufficiently. If the inner diameters of the hydrogen fluoride gas removal processor 10 and the removing agent regeneration processor 30 are the same, and the dimensions of the rotary screws 13 and 33 are also the same, the rotational speeds of the rotary screws 13 and 33 can be synchronized. can easily control the moving speed of the remover.
- the ratio of the inner diameter to the length (length/inner diameter) of the removing agent regeneration processor 30 is preferably 5 or more and 500 or less, and 10 or more and 50 or less, similarly to the hydrogen fluoride gas removal processor 10. is more preferred.
- the inner diameter of the removing agent regeneration processor 30 is not particularly limited as long as the rotating screw 33 can be installed, but is preferably 2 cm or more.
- the filling rate of the removing agent in the removing agent regeneration processor 30 is also preferably 0.3 or more and 0.9 or less, similar to the case of the hydrogen fluoride gas removal processor 10, and preferably 0.4 or more and 0.9. It is more preferably 8 or less, and further preferably 0.6 or more and 0.8 or less. It is preferable that the hydrogen fluoride gas removal processor 10 and the removal agent regeneration treatment device 30 have approximately the same filling rate of the removal agent.
- the ratio is 500 or less, the desorption rate of the hydrogen fluoride gas tends to be high, and if the ratio is 500 or less, the length of the removing agent regeneration processor 30 can be suppressed, so that the rotation of the rotary screw 33 is less likely to be subjected to a load. Further, when the filling rate is 0.3 or more, the desorption rate of hydrogen fluoride gas tends to increase, and when it is 0.9 or less, the rotation of the rotary screw 33 is less likely to be loaded.
- the removing agent moves inside the removing agent regeneration processor 30, but the retention time of the removing agent in the removing agent regeneration processing unit 30 is not particularly limited. However, it is preferably 0.5 to 2 times, more preferably 0.8 to 1.5 times, the residence time of the removing agent in the hydrogen fluoride gas removal apparatus 10. preferable. If it is 0.5 times or more, hydrogen fluoride gas can be sufficiently desorbed from the removing agent at a relatively low temperature, and if it is 2 times or less, a large-sized hydrogen fluoride gas removal device can be used. Since there is no need to use the removing agent, the recycling treatment of the removing agent can be performed economically.
- the pressure in the removing agent regeneration treatment machine 30 in the removing agent regeneration treatment step is preferably 0.01 MPa or more and 2 MPa or less, more preferably 0.05 MPa or more and 1 MPa or less, and 0.09 MPa or more and 0.15 MPa or less. is more preferable.
- the rotating shaft member 32 passes through the other end of the removing agent regeneration processor 30 in the central axis direction. In order to ensure the airtightness inside 30, it is desirable to prevent the pressure inside remover regenerator 30 from becoming too high.
- the pressure inside the removing agent regenerating machine 30 can be measured, for example, with a pressure gauge installed inside the removing agent regenerating machine 30. Furthermore, a desired pressure is maintained by providing an opening adjustment valve at the gas discharge port 36 from which the hydrogen fluoride mixed inert gas is discharged and interlocking the opening of the opening adjustment valve with the indication of the pressure gauge. be able to.
- the pressure difference is preferably 0.01 MPa or more and 1 MPa or less, more preferably 0.01 MPa or more and 0.5 MPa or less, and even more preferably 0.01 MPa or more and 0.1 MPa or less.
- Conditions for the regeneration process such as the flow rate of the inert gas supplied to the removing agent regeneration processor 30 and the temperature of the removing agent in the removing agent regeneration processor 30, are the same as the regeneration treated gas discharged from the removing agent regeneration processor 30. may be adjusted by sampling and analyzing the remover. For example, the regenerated removing agent is sampled from the regenerated removing agent outlet 38, the mass of the sample is measured, and the sample is put into pure water to extract the hydrogen fluoride contained in the removing agent into the pure water. Alternatively, the amount of hydrogen fluoride contained in the regenerated removing agent may be obtained by measuring the amount of hydrogen fluoride contained in the pure water by neutralization titration.
- the fluoride contained in the regenerated remover can be determined. Hydrogen content may be determined.
- the content of hydrogen fluoride contained in the regenerated remover is preferably 1% by mass or less, more preferably 0.5% by mass or less, and 0.1% by mass or less. is more preferred.
- the remover regenerate processor 30 is operated to raise the temperature of the remover in the remover regenerator 30. It is preferable to adjust the conditions of the regeneration treatment, such as increasing the amount of supplied inert gas.
- the material of the recovery tank 41 is not particularly limited, but stainless steel or the like can be used, and the inner surface thereof may be lined with a resin such as fluorine resin.
- the size of the recovery tank 41 is not particularly limited, it is preferably large enough to store the entire amount of the remover that can be accommodated in the hydrogen fluoride gas remover 10 and the remover regenerator 30 . Normally, hydrogen fluoride gas removal is operated while the removal agent is stored in an amount of about 30 to 50% of the capacity of the recovery tank 41 .
- the inner diameter of the hydrogen fluoride gas removal processor was 150 mm, the length was 3 m, and the internal volume of the hydrogen fluoride gas removal processor after subtracting the volume of the rotating screw was 34 L.
- the filling rate of the removing agent was set to 0.7. Therefore, the amount of remover in the hydrogen fluoride gas remover is 24L.
- the rotational speed of the rotating screw was 1 rpm, the geared motor speed reduction ratio was 1/1500, the frequency was 50 Hz, and the removal agent supply rate to the hydrogen fluoride gas removal processor was 83 L/h.
- the hydrogen fluoride gas removal equipment was operated in the same way as described above, and the used removal agent was regenerated.
- the hydrogen fluoride gas removing apparatus was operated for 1000 hours while circulating the removing agent using the regenerated removing agent transporter, but the hydrogen fluoride gas removing performance of the removing agent did not deteriorate. In addition, clogging of the hydrogen fluoride gas removal processor due to adhesion of the remover did not occur.
- Example 2 First, a molten salt of potassium fluoride/hydrogen fluoride (KF/2HF) was subjected to constant-current electrolysis with a direct current of 2000 A to generate fluorine gas from the anode. As a result, 0.753 m 3 /h of fluorine gas was generated in terms of standard conditions (0° C., 0.101325 MPa). The concentration of hydrogen fluoride gas in this fluorine gas was calculated from the results of analysis using FT-IR to be 10% by volume, and the flow rate of hydrogen fluoride gas was 0.084 m 3 /h.
- KF/2HF potassium fluoride/hydrogen fluoride
- a hydrogen fluoride gas remover having the same configuration as the hydrogen fluoride gas remover shown in FIG. 1 was used, and the hydrogen fluoride gas remover was operated in the same manner as described above to generate A process for removing hydrogen fluoride gas from fluorine gas was performed in the same manner as in Example 1.
- the remover used is the same as in Example 1.
- the hydrogen fluoride gas removal equipment was operated in the same way as described above, and the used removal agent was regenerated.
- the hydrogen fluoride gas removing apparatus was operated for 1000 hours while circulating the removing agent using the regenerated removing agent transporter, but the hydrogen fluoride gas removing performance of the removing agent did not deteriorate. In addition, clogging of the hydrogen fluoride gas removal processor due to adhesion of the remover did not occur.
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Abstract
Description
本発明は、フッ化水素ガスを含有する混合ガスから除去剤を用いてフッ化水素ガスを除去する除去処理を行う際に、除去剤の癒着が生じにくいフッ化水素ガス除去装置及びフッ化水素ガスの除去方法を提供することを課題とする。
[1] フッ化水素ガスと他種のガスとを含有する混合ガスから前記フッ化水素ガスを除去するフッ化水素ガス除去装置であって、
前記混合ガスから前記フッ化水素ガスを除去する除去剤を収容可能となっているとともに、前記混合ガスが導入されるガス導入口と、前記フッ化水素ガスを除去する処理が施された前記混合ガスが排出されるガス排出口と、を有し、前記除去剤に前記混合ガスを接触させることにより前記混合ガスから前記フッ化水素ガスを除去する処理を行うフッ化水素ガス除去処理機と、
前記除去剤を前記フッ化水素ガス除去処理機に供給する除去剤供給機と、
前記フッ化水素ガス除去処理機内に収容されている前記除去剤を、前記フッ化水素ガス除去処理機内において移動させる除去剤移動機と、
前記フッ化水素ガス除去処理機において前記混合ガスから前記フッ化水素ガスを除去する処理に使用された使用済みの前記除去剤を、前記フッ化水素ガス除去処理機から排出する除去剤排出機と、
を備えるフッ化水素ガス除去装置。
[3] 前記除去剤が、前記フッ化水素ガスを吸着する吸着剤である[1]又は[2]に記載のフッ化水素ガス除去装置。
[5] 前記フッ化水素ガス除去処理機内の前記除去剤の温度を-30℃以上100℃以下に制御するフッ化水素ガス除去処理機用温度制御部を備える[3]又は[4]に記載のフッ化水素ガス除去装置。
[7] 前記他種のガスが、フッ素ガス、一フッ化塩素、三フッ化塩素、五フッ化塩素、三フッ化臭素、五フッ化臭素、七フッ化臭素、三フッ化ヨウ素、五フッ化ヨウ素、七フッ化ヨウ素、四フッ化ウラン、六フッ化ウラン、六フッ化タングステン、四フッ化ケイ素、三フッ化窒素、及び四フッ化硫黄からなる群より選ばれる少なくとも1種である[1]~[6]のいずれか一項に記載のフッ化水素ガス除去装置。
[8] 前記除去剤移動機がスクリューフィーダー又はスクリューコンベアである[1]~[7]のいずれか一項に記載のフッ化水素ガス除去装置。
前記混合ガスから前記フッ化水素ガスを除去する除去剤を、前記混合ガスから前記フッ化水素ガスを除去する処理を行うフッ化水素ガス除去処理機に供給する除去剤供給工程と、
前記除去剤が収容された前記フッ化水素ガス除去処理機のガス導入口に前記混合ガスを導入するとともに、前記除去剤を前記フッ化水素ガス除去処理機内において移動させ、前記フッ化水素ガス除去処理機内を移動する前記除去剤に前記混合ガスを接触させた後に、前記フッ化水素ガス除去処理機のガス排出口から排出して、前記混合ガスから前記フッ化水素ガスを除去する処理を行うフッ化水素ガス除去処理工程と、
前記フッ化水素ガス除去処理工程において前記混合ガスから前記フッ化水素ガスを除去する処理に使用された使用済みの前記除去剤を、前記フッ化水素ガス除去処理機から排出する除去剤排出工程と、
を備えるフッ化水素ガスの除去方法。
[11] 前記除去剤が、前記フッ化水素ガスを吸着する吸着剤である[9]又は[10]に記載のフッ化水素ガスの除去方法。
[13] 前記フッ化水素ガス除去処理工程においては、前記フッ化水素ガス除去処理機内の前記除去剤の温度を-30℃以上100℃以下とする[11]又は[12]に記載のフッ化水素ガスの除去方法。
[15] 前記他種のガスが、フッ素ガス、一フッ化塩素、三フッ化塩素、五フッ化塩素、三フッ化臭素、五フッ化臭素、七フッ化臭素、三フッ化ヨウ素、五フッ化ヨウ素、七フッ化ヨウ素、四フッ化ウラン、六フッ化ウラン、六フッ化タングステン、四フッ化ケイ素、三フッ化窒素、及び四フッ化硫黄からなる群より選ばれる少なくとも1種である[9]~[14]のいずれか一項に記載のフッ化水素ガスの除去方法。
[16] スクリューフィーダー又はスクリューコンベアを用いて前記除去剤を前記フッ化水素ガス除去処理機内において移動させる[9]~[15]のいずれか一項に記載のフッ化水素ガスの除去方法。
本実施形態に係るフッ化水素ガス除去装置及びフッ化水素ガスの除去方法においては、除去剤をフッ化水素ガス除去処理機内において移動させ、フッ化水素ガス除去処理機内を移動する除去剤に混合ガスを接触させるが、除去剤の移動の態様は特に限定されるものではなく、フッ化水素ガス除去処理機内を直線状に移動させてもよいし、螺旋状、円状、楕円状等の曲線状に移動させてもよい。
除去剤の種類は、混合ガスからフッ化水素ガスを除去することができるならば特に限定されるものではなく、例えば、フッ化水素ガスを吸着して除去する吸着剤であってもよいし、フッ化水素ガスと反応して除去する反応剤であってもよい。
除去剤の平均粒径は、例えば、レーザー回折式粒度分布測定装置や乾式分級法で測定可能である。
また、フッ化水素ガス除去処理機内の除去剤の温度の測定方法は特に限定されるものではないが、例えば、フッ化水素ガス除去処理機内に熱電対を挿入することによって測定することができる。
なお、除去剤供給機20を用いる代わりに、除去剤の自重によって貯蔵タンク25から除去剤がフッ化水素ガス除去処理機10内に供給されるようにしてもよい。
フッ化水素ガス除去処理機10の内径及び長さは特に限定されるものではないが、フッ化水素ガス除去処理機10への混合ガスの供給量と、フッ化水素ガスを除去する処理を施す前の混合ガス中のフッ化水素ガスの濃度と、フッ化水素ガスを除去する処理が施された後の混合ガス中のフッ化水素ガスの濃度とに基づいて調整することが好ましい。
さらに、充填率が0.3以上であればフッ化水素ガスの除去率が高くなりやすく、0.9以下であれば回転スクリュー13の回転に負荷がかかりにくい。
除去剤再生処理機30の内径及び長さは特に限定されるものではないが、使用済みの除去剤が含有しているフッ化水素の量と、除去剤再生処理機30に供給する不活性ガスの量と、除去剤再生処理機30内の除去剤の温度とに基づいて調整することが好ましい。
回転スクリュー33をモーター34で回転させるために、回転軸部材32が除去剤再生処理機30の中心軸方向他端部を貫通しているので、回転軸部材32の軸受部で除去剤再生処理機30内の気密性を確保するためには、除去剤再生処理機30内の圧力は高くなり過ぎないようにすることが望ましい。
再生処理済みの除去剤に含有しているフッ化水素の含有量の測定値が高かった場合には、除去剤再生処理機30内の除去剤の温度を上昇させる、除去剤再生処理機30に供給する不活性ガスの量を多くするなど、再生処理の条件を調整するとよい。
〔実施例1〕
まず、フッ化カリウム・フッ化水素(KF・2HF)の溶融塩を、3000Aの直流電流で定電流電気分解することにより、陽極からフッ素ガスを発生させた。その結果、標準状態換算(0℃、0.101325MPa)で1.13m3/h(以下、特に断りがない限りガスの流量は標準状態換算した値を示す。)のフッ素ガスが発生した。そして、このフッ素ガス中のフッ化水素ガスの濃度を、FT-IRを用いた分析結果から算出したところ12体積%であり、フッ化水素ガスの流量は0.154m3/hであった。
まず、フッ化カリウム・フッ化水素(KF・2HF)の溶融塩を、2000Aの直流電流で定電流電気分解することにより、陽極からフッ素ガスを発生させた。その結果、標準状態換算(0℃、0.101325MPa)で0.753m3/hのフッ素ガスが発生した。そして、このフッ素ガス中のフッ化水素ガスの濃度を、FT-IRを用いた分析結果から算出したところ10体積%であり、フッ化水素ガスの流量は0.084m3/hであった。
混合ガスのSVは24.6/h(=(0.753+0.084)×1000/34)である。また、除去剤の時空速度は2.4/h(=83/34)であり、混合ガスのSVの0.01倍(=2.4/24.6)である。
フッ化水素ガス除去処理機から回転スクリューを取り外して、フッ化水素ガス除去処理機の中心軸方向中央部分に平均粒径3mmのフッ化ナトリウムのペレットを24L充填した。そして、充填したフッ化ナトリウムのペレットの中心軸方向両端部を、ニッケル製のメッシュで押さえた。さらに、除去剤供給口及び除去剤排出口を閉鎖して、フッ化水素ガス除去処理機を固定床式の処理装置とした。これらの点以外は実施例1と同様にして、混合ガスからフッ化水素ガスを除去する処理を行った。
13・・・回転スクリュー
15・・・ガス導入口
16・・・ガス排出口
17・・・除去剤供給口
18・・・除去剤排出口
20・・・除去剤供給機
30・・・除去剤再生処理機
33・・・回転スクリュー
35・・・ガス導入口
36・・・ガス排出口
37・・・使用済み除去剤供給口
38・・・再生処理済み除去剤排出口
39・・・加熱器
40・・・再生処理済み除去剤輸送機
41・・・回収タンク
42・・・輸送ライン
Claims (16)
- フッ化水素ガスと他種のガスとを含有する混合ガスから前記フッ化水素ガスを除去するフッ化水素ガス除去装置であって、
前記混合ガスから前記フッ化水素ガスを除去する除去剤を収容可能となっているとともに、前記混合ガスが導入されるガス導入口と、前記フッ化水素ガスを除去する処理が施された前記混合ガスが排出されるガス排出口と、を有し、前記除去剤に前記混合ガスを接触させることにより前記混合ガスから前記フッ化水素ガスを除去する処理を行うフッ化水素ガス除去処理機と、
前記除去剤を前記フッ化水素ガス除去処理機に供給する除去剤供給機と、
前記フッ化水素ガス除去処理機内に収容されている前記除去剤を、前記フッ化水素ガス除去処理機内において移動させる除去剤移動機と、
前記フッ化水素ガス除去処理機において前記混合ガスから前記フッ化水素ガスを除去する処理に使用された使用済みの前記除去剤を、前記フッ化水素ガス除去処理機から排出する除去剤排出機と、
を備えるフッ化水素ガス除去装置。 - 前記除去剤移動機は、前記フッ化水素ガス除去処理機内において前記除去剤を0.05/h以上3000/h以下の空間速度で移動させる請求項1に記載のフッ化水素ガス除去装置。
- 前記除去剤が、前記フッ化水素ガスを吸着する吸着剤である請求項1又は請求項2に記載のフッ化水素ガス除去装置。
- 前記吸着剤が、フッ化リチウム、フッ化ナトリウム、フッ化カリウム、フッ化ルビジウム、フッ化セシウム、フッ化マグネシウム、フッ化カルシウム、及びフッ化バリウムからなる群より選ばれる少なくとも1種である請求項3に記載のフッ化水素ガス除去装置。
- 前記フッ化水素ガス除去処理機内の前記除去剤の温度を-30℃以上100℃以下に制御するフッ化水素ガス除去処理機用温度制御部を備える請求項3又は請求項4に記載のフッ化水素ガス除去装置。
- 前記除去剤は、平均粒径が10μm以上10mm以下の粉粒体である請求項1~5のいずれか一項に記載のフッ化水素ガス除去装置。
- 前記他種のガスが、フッ素ガス、一フッ化塩素、三フッ化塩素、五フッ化塩素、三フッ化臭素、五フッ化臭素、七フッ化臭素、三フッ化ヨウ素、五フッ化ヨウ素、七フッ化ヨウ素、四フッ化ウラン、六フッ化ウラン、六フッ化タングステン、四フッ化ケイ素、三フッ化窒素、及び四フッ化硫黄からなる群より選ばれる少なくとも1種である請求項1~6のいずれか一項に記載のフッ化水素ガス除去装置。
- 前記除去剤移動機がスクリューフィーダー又はスクリューコンベアである請求項1~7のいずれか一項に記載のフッ化水素ガス除去装置。
- フッ化水素ガスと他種のガスとを含有する混合ガスから前記フッ化水素ガスを除去するフッ化水素ガスの除去方法であって、
前記混合ガスから前記フッ化水素ガスを除去する除去剤を、前記混合ガスから前記フッ化水素ガスを除去する処理を行うフッ化水素ガス除去処理機に供給する除去剤供給工程と、
前記除去剤が収容された前記フッ化水素ガス除去処理機のガス導入口に前記混合ガスを導入するとともに、前記除去剤を前記フッ化水素ガス除去処理機内において移動させ、前記フッ化水素ガス除去処理機内を移動する前記除去剤に前記混合ガスを接触させた後に、前記フッ化水素ガス除去処理機のガス排出口から排出して、前記混合ガスから前記フッ化水素ガスを除去する処理を行うフッ化水素ガス除去処理工程と、
前記フッ化水素ガス除去処理工程において前記混合ガスから前記フッ化水素ガスを除去する処理に使用された使用済みの前記除去剤を、前記フッ化水素ガス除去処理機から排出する除去剤排出工程と、
を備えるフッ化水素ガスの除去方法。 - 前記フッ化水素ガス除去処理工程においては前記フッ化水素ガス除去処理機内を移動する前記除去剤の空間速度が0.05/h以上3000/h以下である請求項9に記載のフッ化水素ガスの除去方法。
- 前記除去剤が、前記フッ化水素ガスを吸着する吸着剤である請求項9又は請求項10に記載のフッ化水素ガスの除去方法。
- 前記吸着剤が、フッ化リチウム、フッ化ナトリウム、フッ化カリウム、フッ化ルビジウム、フッ化セシウム、フッ化マグネシウム、フッ化カルシウム、及びフッ化バリウムからなる群より選ばれる少なくとも1種である請求項11に記載のフッ化水素ガスの除去方法。
- 前記フッ化水素ガス除去処理工程においては、前記フッ化水素ガス除去処理機内の前記除去剤の温度を-30℃以上100℃以下とする請求項11又は請求項12に記載のフッ化水素ガスの除去方法。
- 前記除去剤は、平均粒径が10μm以上10mm以下の粉粒体である請求項9~13のいずれか一項に記載のフッ化水素ガスの除去方法。
- 前記他種のガスが、フッ素ガス、一フッ化塩素、三フッ化塩素、五フッ化塩素、三フッ化臭素、五フッ化臭素、七フッ化臭素、三フッ化ヨウ素、五フッ化ヨウ素、七フッ化ヨウ素、四フッ化ウラン、六フッ化ウラン、六フッ化タングステン、四フッ化ケイ素、三フッ化窒素、及び四フッ化硫黄からなる群より選ばれる少なくとも1種である請求項9~14のいずれか一項に記載のフッ化水素ガスの除去方法。
- スクリューフィーダー又はスクリューコンベアを用いて前記除去剤を前記フッ化水素ガス除去処理機内において移動させる請求項9~15のいずれか一項に記載のフッ化水素ガスの除去方法。
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