WO2011083639A1 - フッ素ガス生成装置 - Google Patents
フッ素ガス生成装置 Download PDFInfo
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- WO2011083639A1 WO2011083639A1 PCT/JP2010/071338 JP2010071338W WO2011083639A1 WO 2011083639 A1 WO2011083639 A1 WO 2011083639A1 JP 2010071338 W JP2010071338 W JP 2010071338W WO 2011083639 A1 WO2011083639 A1 WO 2011083639A1
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- WIPO (PCT)
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- gas
- fluorine gas
- hydrogen fluoride
- nitrogen
- fluorine
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/245—Fluorine; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/01—Electrolytic cells characterised by shape or form
- C25B9/015—Cylindrical cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
-
- 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
- C01B7/20—Fluorine
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/085—Removing impurities
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Definitions
- the present invention relates to a fluorine gas generator.
- JP2004-43885A is equipped with an electrolytic cell that electrolyzes hydrogen fluoride in an electrolytic bath made of a molten salt containing hydrogen fluoride, and generates a product gas containing fluorine gas as the main component in the first gas phase portion on the anode side.
- a fluorine gas generation device that generates a by-product gas mainly containing hydrogen gas in a second gas phase portion on the cathode side is disclosed.
- JP 2004-39740A discloses an apparatus that cools a fluorine gas component and a component other than the fluorine gas component and separates them using a difference in boiling points between the two.
- liquid nitrogen used as a refrigerant is released into the atmosphere during the purification process and is not used effectively.
- the present invention has been made in view of the above problems, and an object thereof is to effectively use a refrigerant used for purification of fluorine gas.
- the present invention is a fluorine gas generation device that generates fluorine gas by electrolyzing hydrogen fluoride in a molten salt, the main component being fluorine gas generated at an anode immersed in the molten salt.
- the first gas chamber into which the main gas is guided and the second gas chamber into which the by-product gas mainly composed of hydrogen gas generated at the cathode immersed in the molten salt is separated on the molten salt liquid surface.
- the hydrogen fluoride gas vaporized from the molten salt of the electrolytic cell and mixed with the main gas generated from the anode is solidified using a refrigerant and collected to collect fluorine gas.
- the refrigerant discharged and used for coagulation of hydrogen fluoride gas in the purifier is reused as a utility gas used in various parts of the fluorine gas generator .
- the refrigerant discharged and used for the solidification of the hydrogen fluoride gas in the refining device is reused as the utility gas used in various parts of the fluorine gas generating device.
- the refrigerant used can be used effectively.
- FIG. 1 is a system diagram showing a fluorine gas generator according to an embodiment of the present invention.
- FIG. 2 is a system diagram of the purification apparatus.
- FIG. 3 is a graph showing changes in pressure and temperature in the inner tube of the refining device with time, a solid line indicates the pressure, and a one-dot chain line indicates the temperature.
- FIG. 4 is a system diagram of the nitrogen recovery facility.
- FIG. 1 a fluorine gas generation apparatus 100 according to an embodiment of the present invention will be described.
- the fluorine gas generation device 100 generates fluorine gas by electrolysis and supplies the generated fluorine gas to the external device 4.
- the external device 4 is, for example, a semiconductor manufacturing device.
- fluorine gas is used as a cleaning gas, for example, in a semiconductor manufacturing process.
- the fluorine gas generation device 100 includes an electrolytic cell 1 that generates fluorine gas by electrolysis, a fluorine gas supply system 2 that supplies the fluorine gas generated from the electrolytic cell 1 to the external device 4, and the generation of fluorine gas. And a by-product gas processing system 3 for processing the generated by-product gas.
- a molten salt containing hydrogen fluoride (HF) is stored.
- a mixture (KF ⁇ 2HF) of hydrogen fluoride and potassium fluoride (KF) is used as the molten salt.
- the inside of the electrolytic cell 1 is partitioned into an anode chamber 11 and a cathode chamber 12 by a partition wall 6 immersed in the molten salt.
- the anode 7 and the cathode 8 are immersed, respectively.
- a main gas mainly composed of fluorine gas (F 2 ) is generated at the anode 7, and hydrogen gas (H 2 ) is generated at the cathode 8.
- F 2 fluorine gas
- H 2 hydrogen gas
- By-product gas as a main component is generated.
- a carbon electrode is used for the anode 7, and soft iron, monel, or nickel is used for the cathode 8.
- a first gas chamber 11a into which fluorine gas generated at the anode 7 is guided, and a second gas chamber 12a into which hydrogen gas generated at the cathode 8 is guided. are partitioned by the partition wall 6 so that the mutual gas cannot pass.
- the first air chamber 11a and the second air chamber 12a are completely separated by the partition wall 6 in order to prevent a reaction due to the contact of fluorine gas and hydrogen gas.
- the molten salt in the anode chamber 11 and the cathode chamber 12 is not separated by the partition wall 6 but communicates through the lower portion of the partition wall 6.
- each of the fluorine gas and the hydrogen gas generated from the anode 7 and the cathode 8 of the electrolytic cell 1 hydrogen fluoride is vaporized from the molten salt by the vapor pressure and mixed.
- each of the fluorine gas generated at the anode 7 and guided to the first air chamber 11a and the hydrogen gas generated at the cathode 8 and guided to the second air chamber 12a includes hydrogen fluoride gas. Yes.
- the electrolytic cell 1 is provided with a liquid level gauge 13 as a liquid level detector for detecting the liquid level of the stored molten salt.
- the liquid level gauge 13 detects the back pressure when the nitrogen gas having a constant flow rate is purged into the molten salt through the insertion tube 13a inserted into the electrolytic cell 1, and the liquid level gauge 13 detects the liquid pressure from the back pressure and the liquid specific gravity of the molten salt. It is a back pressure type liquid level gauge that detects the surface level.
- a first main passage 15 for supplying fluorine gas to the external device 4 is connected to the first air chamber 11a.
- the first main passage 15 is provided with a first pump 17 for deriving and transporting fluorine gas from the first air chamber 11a.
- a positive displacement pump such as a bellows pump or a diaphragm pump is used.
- a purification device 16 that collects hydrogen fluoride gas mixed in the main raw gas and purifies the fluorine gas.
- the refining device 16 is a device that separates and removes hydrogen fluoride gas from fluorine gas by utilizing the difference in boiling point between fluorine and hydrogen fluoride.
- the purifier 16 includes two systems, a first purifier 16a and a second purifier 16b, provided in parallel, and is switched so that the fluorine gas passes through only one of the systems. That is, when one of the first refining device 16a and the second refining device 16b is in an operating state, the other is stopped or in a standby state.
- the purification device 16 will be described in detail later.
- a first buffer tank 21 for storing the fluorine gas transported by the first pump 17 is provided downstream of the first pump 17 in the first main passage 15.
- the fluorine gas stored in the first buffer tank 21 is supplied to the external device 4.
- a flow meter 26 for detecting the flow rate of the fluorine gas supplied to the external device 4 is provided downstream of the first buffer tank 21.
- the power source 9 controls the current value supplied between the anode 7 and the cathode 8 based on the detection result of the flow meter 26. Specifically, the amount of fluorine gas generated at the anode 7 is controlled so as to supplement the fluorine gas supplied to the external device 4.
- the fluorine gas supplied to the external device 4 is controlled to be replenished, and the internal pressure of the first buffer tank 21 is maintained at a pressure higher than the atmospheric pressure.
- the external device 4 side where fluorine gas is used is atmospheric pressure, if the valve provided in the external device 4 is opened, the pressure difference between the first buffer tank 21 and the external device 4 As a result, the fluorine gas is supplied from the first buffer tank 21 to the external device 4.
- a branch passage 22 is connected to the first buffer tank 21, and a pressure regulating valve 23 that controls the internal pressure of the first buffer tank 21 is provided in the branch passage 22.
- the first buffer tank 21 is provided with a pressure gauge 24 that detects the internal pressure.
- the pressure adjustment valve 23 controls the internal pressure of the first buffer tank 21 so as not to exceed a predetermined pressure based on the detection result of the pressure gauge 24. Specifically, when the internal pressure of the first buffer tank 21 exceeds 1.0 MPa, the valve is opened and the fluorine gas in the first buffer tank 21 is discharged.
- a second buffer tank 50 for storing the fluorine gas discharged from the first buffer tank 21 is provided downstream of the pressure regulating valve 23 in the branch passage 22. That is, when the internal pressure of the first buffer tank 21 exceeds a predetermined pressure, the fluorine gas in the first buffer tank 21 is discharged through the pressure adjustment valve 23, and the discharged fluorine gas is discharged to the second buffer tank 50. Led to.
- the second buffer tank 50 has a smaller volume than the first buffer tank 21.
- a pressure regulating valve 51 for controlling the internal pressure of the second buffer tank 50 is provided downstream of the second buffer tank 50 in the branch passage 22.
- the second buffer tank 50 is provided with a pressure gauge 52 that detects the internal pressure. Based on the detection result of the pressure gauge 52, the pressure adjustment valve 51 controls the internal pressure of the second buffer tank 50 to be a predetermined pressure.
- the fluorine gas discharged from the second buffer tank 50 through the pressure regulating valve 51 is rendered harmless by the abatement part 53 and released.
- a fluorine gas supply passage 54 for supplying fluorine gas to the purifier 16.
- a second main passage 30 for discharging hydrogen gas to the outside is connected to the second air chamber 12a.
- the second main passage 30 is provided with a second pump 31 for deriving and transporting hydrogen gas from the second air chamber 12a.
- the abatement part 34 is provided downstream of the second pump 31 in the second main passage 30, and the hydrogen gas transported by the second pump 31 is rendered harmless by the abatement part 34 and released.
- the fluorine gas generator 100 also includes a raw material supply system 5 that supplies hydrogen fluoride, which is a raw material of fluorine gas, into the molten salt of the electrolytic cell 1. Below, the raw material supply system 5 is demonstrated.
- the raw material supply system 5 includes a hydrogen fluoride supply source 40 in which hydrogen fluoride for replenishing the electrolytic cell 1 is stored.
- the hydrogen fluoride supply source 40 and the electrolytic cell 1 are connected via a raw material supply passage 41.
- Hydrogen fluoride stored in the hydrogen fluoride supply source 40 is supplied into the molten salt of the electrolytic cell 1 through the raw material supply passage 41.
- the raw material supply passage 41 is provided with a flow rate control valve 42 for controlling the supply flow rate of hydrogen fluoride.
- the flow rate control valve 42 controls the supply flow rate of hydrogen fluoride based on the detection result of the level gauge 13 so that the liquid level of the molten salt in the electrolytic cell 1 becomes a predetermined level. That is, the flow rate control valve 42 controls the supply flow rate of hydrogen fluoride so as to replenish hydrogen fluoride electrolyzed in the molten salt.
- a carrier gas supply passage 46 that guides the carrier gas supplied from the carrier gas supply source 45 into the raw material supply passage 41 is connected to the raw material supply passage 41.
- the carrier gas supply passage 46 is provided with a cutoff valve 47 for switching between supply and cutoff of the carrier gas.
- the carrier gas is an accompanying gas for introducing hydrogen fluoride stored in the hydrogen fluoride supply source 40 into the molten salt of the electrolytic cell 1, and nitrogen gas which is an inert gas is used.
- the shut-off valve 47 is basically open, and nitrogen gas is supplied into the molten salt in the cathode chamber 12 of the electrolytic cell 1. The nitrogen gas is hardly dissolved in the molten salt and is discharged from the second air chamber 12a through the byproduct gas processing system 3.
- purifier 16b are the same structures, below, it demonstrates centering around the 1st refiner
- the same reference numerals are assigned and description thereof is omitted.
- the configuration of the first refining device 16a is distinguished by attaching “a” to the symbol, and the configuration of the second refining device 16b is appended with “b”.
- the first refining device 16a has an inner tube 61a as a gas inflow portion into which fluorine gas containing hydrogen fluoride gas flows, and hydrogen fluoride gas mixed in the fluorine gas solidifies, while fluorine gas passes through the inner tube 61a.
- a cooling device 70a that cools the inner tube 61a at a temperature not lower than the boiling point of fluorine and not higher than the melting point of hydrogen fluoride is provided.
- the inner tube 61a is a bottomed cylindrical member, and the upper opening is sealed with a lid member 62a.
- the lid member 62a of the inner tube 61a is connected to an inlet passage 63a that guides the fluorine gas generated by the anode 7 into the inner tube 61a.
- the inlet passage 63a is one of the two branches of the first main passage 15, and the other inlet passage 63b is connected to the inner tube 61b of the second purification device 16b.
- the inlet passage 63a is provided with an inlet valve 64a that allows or blocks the flow of fluorine gas into the inner tube 61a.
- the inner surface of the lid member 62a of the inner tube 61a is connected to a conduit 67a provided in the inner tube 61a.
- the conduit 67a is formed in such a length that the lower end opening is located near the bottom of the inner tube 61a.
- the upper end portion of the conduit 67a is connected to the lid member 62a and is connected to an outlet passage 65a for discharging the fluorine gas from the inner tube 61a. Therefore, the fluorine gas in the inner tube 61a flows out through the conduit 67a and the outlet passage 65a.
- the outlet passage 65a is provided with an outlet valve 66a that allows or blocks the outflow of fluorine gas from the inner tube 61a.
- the outlet passage 65a merges with the outlet passage 65b of the second refining device 16b and is connected to the first pump 17.
- the fluorine gas generated at the anode 7 flows into the inner tube 61a through the inlet passage 63a, and flows out of the inner tube 61a through the conduit 67a and the outlet passage 65a.
- the inlet valve 64a and the outlet valve 66a are in an open state, and when the first purification device 16a is in a stopped or standby state, the inlet valve 64a and the outlet valve 66a. Is closed.
- the inner tube 61a is provided with a thermometer 68a that detects the internal temperature through the lid member 62a.
- the inlet passage 63a is provided with a pressure gauge 69a that detects the internal pressure of the inner tube 61a.
- the cooling device 70a can partially accommodate the inner tube 61a and can store liquid nitrogen as a refrigerant therein, and a liquid nitrogen supply / discharge system 72a that supplies and discharges liquid nitrogen to and from the jacket tube 71a.
- a liquid nitrogen supply / discharge system 72a that supplies and discharges liquid nitrogen to and from the jacket tube 71a.
- the jacket tube 71a is a bottomed cylindrical member, and the upper opening is sealed with a lid member 73a.
- the inner tube 61a is accommodated coaxially in the jacket tube 71a with the upper side protruding from the lid member 73a. Specifically, about 80 to 90% of the inner tube 61a is accommodated in the jacket tube 71a.
- a liquid nitrogen supply passage 77a for guiding liquid nitrogen supplied from the liquid nitrogen supply source 76 into the jacket tube 71a is connected to the lid member 73a of the jacket tube 71a.
- the inner surface of the cover member 73a of the jacket tube 71a is connected to a conduit 82a provided in a manner hanging down in the jacket tube 71a, and the upper end of the conduit 82a is connected to the liquid nitrogen supply passage 77a. Accordingly, the liquid nitrogen supplied from the liquid nitrogen supply source 76 is guided into the jacket tube 71a through the liquid nitrogen supply passage 77a and the conduit 82a.
- the conduit 82a is formed in such a length that the lower end opening is located near the bottom of the jacket tube 71a.
- the liquid nitrogen supply passage 77a is provided with a flow rate control valve 78a for controlling the supply flow rate of liquid nitrogen.
- a pressure gauge 80a for detecting the internal pressure of the jacket tube 71a is provided downstream of the flow rate control valve 78a in the liquid nitrogen supply passage 77a.
- the inside of the jacket tube 71a consists of two layers of liquid nitrogen and vaporized nitrogen gas, and the liquid level of the liquid nitrogen is detected by a liquid level gauge 74a provided through the lid member 73a.
- a nitrogen gas discharge passage 79a for discharging the nitrogen gas in the jacket tube 71a is connected to the lid member 73a of the jacket tube 71a.
- the nitrogen gas discharge passage 79a is provided with a pressure adjustment valve 81a for controlling the internal pressure of the jacket tube 71a.
- the pressure regulating valve 81a controls the internal pressure of the jacket tube 71a to be a predetermined pressure based on the detection result of the pressure gauge 80a.
- the predetermined pressure is determined so that the temperature of the liquid nitrogen in the jacket tube 71a is not lower than the boiling point of fluorine ( ⁇ 188 ° C.) and not higher than the melting point of hydrogen fluoride ( ⁇ 84 ° C.).
- the pressure is set to 0.4 MPa so that the temperature of the liquid nitrogen in the jacket tube 71a is about ⁇ 180 ° C.
- the pressure regulating valve 81a controls the internal pressure of the jacket tube 71a to 0.4 MPa so that the temperature of liquid nitrogen in the jacket tube 71a is maintained at about ⁇ 180 ° C.
- the nitrogen gas discharged through the pressure regulating valve 81a is guided to a nitrogen buffer tank 210 (see FIG. 4) described later.
- the flow rate control valve 78a is supplied from the liquid nitrogen supply source 76 to the jacket tube 71a so that the liquid level of the liquid nitrogen in the jacket tube 71a is kept constant based on the detection result of the liquid level gauge 74a. Control the supply flow rate of liquid nitrogen.
- a heat insulating material or a heat insulating layer for heat insulation may be provided outside the jacket tube 71a.
- the inner tube 61a Since the inner tube 61a is cooled by the jacket tube 71a to a temperature not lower than the boiling point of fluorine and not higher than the melting point of hydrogen fluoride, only hydrogen fluoride mixed in the fluorine gas is solidified in the inner tube 61a. It passes through the inner tube 61a. Since fluorine gas is continuously guided from the electrolytic cell 1 into the inner tube 61a, the solidified hydrogen fluoride is accumulated in the inner tube 61a as time passes. When the accumulated amount of solidified hydrogen fluoride reaches a predetermined amount, the operation of the first purification device 16a is stopped, the second purification device 16b in the standby state is activated, and the operation of the purification device 16 is switched. . The operation switching will be described in detail later.
- Whether or not the accumulated amount of solidified hydrogen fluoride has reached a predetermined amount is determined by the detection result of the differential pressure gauge 86a provided across the inlet passage 63a and the outlet passage 65a of the inner tube 61a, that is, the inner tube 61a. It is determined based on the differential pressure between the inlet and outlet. When the differential pressure between the inlet and outlet of the inner tube 61a reaches a predetermined value, it is determined that the accumulated amount of solidified hydrogen fluoride in the inner tube 61a has reached a predetermined amount, and the first refining device 16a Stop.
- the differential pressure gauge 86a corresponds to an accumulation state detection unit that detects an accumulation state of hydrogen fluoride in the inner tube 61a. Instead of the differential pressure gauge, the accumulation state of hydrogen fluoride in the inner tube 61a may be detected by the pressure gauge 69a.
- the first refining device 16a is stopped by closing the inlet valve 64a and the outlet valve 66a of the inner tube 61a. After the first purification device 16a is stopped, it is necessary to discharge the solidified hydrogen fluoride accumulated in the inner tube 61a and put the first purification device 16a in a standby state. That is, it is necessary to perform the regeneration process of the first purification device 16a.
- a liquid nitrogen discharge passage 90a for discharging liquid nitrogen in the jacket tube 71a is connected to the bottom of the jacket tube 71a.
- the liquid nitrogen discharge passage 90a is provided with a discharge valve 91a capable of discharging the liquid nitrogen in the jacket tube 71a by opening the valve.
- the liquid nitrogen discharged through the discharge valve 91a is guided to the nitrogen buffer tank 210 (see FIG. 4).
- a nitrogen gas supply passage 93a that guides nitrogen gas supplied from the nitrogen gas supply source 92 into the jacket tube 71a is connected downstream of the flow rate control valve 78a in the liquid nitrogen supply passage 77a.
- the nitrogen gas supply passage 93a is provided with a shutoff valve 94a for switching between supply and shutoff of nitrogen gas to the jacket tube 71a.
- the supply of nitrogen gas from the nitrogen gas supply source 92 to the jacket tube 71a is performed in a state where the discharge valve 91a is fully opened and the flow rate control valve 78a is fully closed.
- Nitrogen gas is a normal temperature gas
- the jacket tube 71a is supplied with normal temperature nitrogen gas while discharging liquid nitrogen. As a result, the temperature of the inner tube 61a rises and the solidified hydrogen fluoride is dissolved.
- a discharge passage 95a for discharging the dissolved hydrogen fluoride to the outside is connected downstream of the inlet valve 64a in the inlet passage 63a.
- the discharge passage 95a is provided with a discharge pump 96 for sucking and transporting the dissolved hydrogen fluoride in the jacket tube 71a.
- a discharge valve 97a that opens when the hydrogen fluoride is discharged is provided upstream of the discharge pump 96.
- an abatement part 98 is provided downstream of the discharge pump 96 in the discharge passage 95a, and the hydrogen fluoride transported by the discharge pump 96 is rendered harmless by the abatement part 98 and released.
- a nitrogen gas supply passage 99a that guides nitrogen gas supplied from the nitrogen gas supply source 92 into the inner tube 61a is connected upstream of the outlet valve 66a in the outlet passage 65a.
- the nitrogen gas supply passage 99a is provided with a shutoff valve 87a for switching between supply and shutoff of nitrogen gas to the inner tube 61a.
- the supply of nitrogen gas from the nitrogen gas supply source 92 to the inner tube 61a is performed with the discharge valve 97a fully opened and the discharge pump 96 activated.
- the dissolved hydrogen fluoride is sucked in by the discharge pump 96 while supplying nitrogen gas at room temperature inside. Thereby, the hydrogen fluoride in the inner tube 61a is discharged.
- the exhaust pump 96 exhausts the inner tube 61a until the internal pressure of the inner tube 61a detected by the pressure gauge 69a is equal to or lower than the atmospheric pressure.
- the hydrogen fluoride in the inner tube 61a discharged by the discharge pump 96 may be returned to the hydrogen fluoride supply source 40 or the electrolytic cell 1 for most use.
- the inner tube 61a After discharging the hydrogen fluoride in the inner tube 61a, the inner tube 61a is filled with fluorine gas. This is because when the second purifier 16b is in operation and the accumulated amount of solidified hydrogen fluoride in the inner tube 61b reaches a predetermined amount, the first purifier 16a is quickly switched to. This is to make it possible.
- the filling of the fluorine gas into the inner tube 61a is performed through a fluorine gas supply passage 54 connected to the second buffer tank 50 and having a downstream end connected downstream of the inlet valve 64a in the inlet passage 63a.
- the fluorine gas supply passage 54 is provided with a shut-off valve 88a that opens when the inner tube 61a is filled with fluorine gas.
- the internal pressure of the second buffer tank 50 is controlled to a pressure higher than the atmospheric pressure by the pressure adjustment valve 51, the internal pressure is stored in the second buffer tank 50 by the differential pressure between the second buffer tank 50 and the inner tube 61a.
- the fluorine gas thus supplied is supplied to the inner tube 61a.
- the fluorine gas stored in the second buffer tank 50 is used for filling the inner tube 61a with the fluorine gas.
- the controller controls the operation of each valve and each pump based on the detection results of the thermometer 68a, the pressure gauge 69a, the liquid level gauge 74a, the pressure gauge 80a, and the differential pressure gauge 86a.
- the first purification device 16a is in an operating state and the second purification device 16b is in a standby state.
- the inlet valve 64a and the outlet valve 66a of the inner tube 61a are an open state, and the fluorine gas is continuously guide
- the second refining device 16b the inlet valve 64b and the outlet valve 66b of the inner tube 61b are closed, and the inner tube 61b is filled with fluorine gas.
- generated in the electrolytic cell 1 is supplied only to the 1st refinement
- Liquid nitrogen introduced through the liquid nitrogen supply passage 77a is stored in the jacket tube 71a of the first refining device 16a, and the inner tube 61a is cooled by the liquid nitrogen.
- the internal pressure of the jacket tube 71a is controlled to 0.4 MPa by the pressure adjustment valve 81a.
- the temperature of the liquid nitrogen in the jacket tube 71a is maintained at about ⁇ 180 ° C., which is not lower than the boiling point of fluorine and not higher than the melting point of hydrogen fluoride, so that only hydrogen fluoride solidifies in the inner tube 61a.
- the fluorine gas passes through the inner tube 61 a and is conveyed to the first buffer tank 21 by the first pump 17.
- the fluorine gas generated in the electrolytic cell 1 flows into the inner tube 61a through the inlet passage 63a, and flows out through the conduit 67a and the outlet passage 65a. Since the lower end opening of the conduit 67a is located near the bottom of the inner tube 61a, the fluorine gas flows in from the upper part of the inner tube 61a and flows out from the lower part of the inner tube 61a. Therefore, since the fluorine gas is sufficiently cooled while passing through the inner tube 61a, the hydrogen fluoride in the fluorine gas can be solidified reliably and the hydrogen fluoride can be completely removed.
- the first refining device 16a Is stopped, the second refining device 16b in the standby state is activated, and the operation of the refining device 16 is switched.
- regeneration process is performed after an operation stop.
- FIG. 3 is a graph showing the temporal change in pressure and temperature in the inner tube 61a of the first refining device 16a, where the solid line indicates the pressure and the alternate long and short dash line indicates the temperature.
- the pressure shown in FIG. 3 is detected by the pressure gauge 69a, and the temperature is detected by the thermometer 68a.
- the first purification device 16a makes a second purification. Operation switching to the device 16b is performed (time t1). Specifically, after the inlet valve 64b and the outlet valve 66b of the inner tube 61b of the second purification device 16b are opened, the inlet valve 64a and the outlet valve 66a of the inner tube 61a of the first purification device 16a are closed. The Thereby, while the 2nd refiner
- liquid nitrogen is discharged from the jacket tube 71a.
- the discharge valve 91a is opened and the liquid nitrogen is discharged into the liquid nitrogen discharge passage. It is discharged into the nitrogen buffer tank 210 (see FIG. 4) through 90a.
- the pressure regulating valve 81a is opened to allow the nitrogen gas in the nitrogen buffer tank 210 to flow into the jacket tube 71a through the nitrogen gas discharge passage 79a. The discharge of liquid nitrogen from the jacket tube 71a may be facilitated.
- shut-off valve 94a of the nitrogen gas supply passage 93a is opened, and normal temperature nitrogen gas is supplied to the jacket tube 71a. Thereby, as shown in FIG. 3, the temperature in the inner tube 61a rises to about room temperature, and the hydrogen fluoride in the inner tube 61a is dissolved.
- the discharge valve 97a of the discharge passage 95a is opened and the discharge pump 96 is started.
- the dissolved hydrogen fluoride in the inner tube 61 b is sucked by the discharge pump 96 and conveyed to the abatement part 98.
- the shutoff valve 87a of the nitrogen gas supply passage 99a is opened to supply room temperature nitrogen gas into the inner tube 61a.
- the dissolved hydrogen fluoride is discharged while supplying nitrogen gas at room temperature.
- liquid nitrogen is supplied into the jacket tube 71a and fluorine gas is supplied into the inner tube 61b in order to place the first purification device 16a in a standby state. Is done. Specifically, with the discharge valve 91a and the shutoff valve 94a of the nitrogen gas supply passage 93a fully closed, the flow rate control valve 78a of the liquid nitrogen supply passage 77a is opened again to supply liquid nitrogen into the jacket tube 71a. (Time t3). Thereby, the internal temperature of the inner tube 61a falls.
- the internal pressure of the jacket tube 71a is controlled to 0.4 MPa by the pressure adjusting valve 81a, the internal temperature of the inner tube 61a is maintained at a level of about ⁇ 180 ° C.
- the shutoff valve 88a of the fluorine gas supply passage 54 is opened, and the fluorine gas in the second buffer tank 50 is supplied into the inner tube 61a (time t4).
- the supply of fluorine gas into the inner tube 61a increases the internal pressure of the inner tube 61a.
- the shutoff valve 88a is closed and supply of fluorine gas is stopped. In this manner, the fluorine gas is filled into the inner tube 61a.
- the regeneration process of the first purification device 16a is completed, and the first purification device enters a standby state (time t5).
- the second buffer tank 50 is a tank that stores the fluorine gas discharged as the internal pressure of the first buffer tank 21 is controlled. That is, in the regeneration step, fluorine gas that has been conventionally released from the first buffer tank 21 to the outside is stored in the second buffer tank 50, and the stored fluorine gas is used.
- a gas that has been conventionally released to the outside is used as the fluorine gas supplied into the inner tube 61a in the regeneration process.
- the stopped first refining device 16a is in a standby state in which the inner tube 61a is cooled to ⁇ 180 ° C. and the inner tube 61a is filled with fluorine gas. Therefore, when the differential pressure between the inlet and the outlet of the inner tube 61b in the operating second purifier 16b reaches a predetermined value, the operation of the second purifier 16b is stopped and the first purifier 16a is quickly activated. And the operation of the refining device 16 can be switched.
- the nitrogen recovery facility 200 recovers nitrogen gas and liquid nitrogen discharged and used for the solidification of hydrogen fluoride gas by the cooling devices 70 a and 70 b of the purification device 16, and uses the nitrogen gas for the fluorine gas generation device 100. It is supplied as utility gas used in various places.
- the nitrogen recovery facility 200 includes a nitrogen buffer tank 210 that recovers and temporarily stores the exhausted nitrogen gas and liquid nitrogen used for the solidification of the hydrogen fluoride gas by the cooling devices 70a and 70b of the purification device 16. Prepare.
- the nitrogen buffer tank 210 is connected to the downstream ends of the nitrogen gas discharge passages 79a and 79b and the downstream ends of the liquid nitrogen discharge passages 90a and 90b. Therefore, in the nitrogen buffer tank 210, the nitrogen gas discharged from the jacket tubes 71a and 71b is recovered through the nitrogen gas discharge passages 79a and 79b, and the liquid nitrogen discharged from the jacket tubes 71a and 71b is recovered as the liquid nitrogen discharge passage. It collects through 90a, 90b.
- the nitrogen buffer tank 210 Since the nitrogen buffer tank 210 is disposed below the jacket tubes 71a and 71b, the liquid nitrogen in the jacket tubes 71a and 71b is opened by opening the discharge valves 91a and 91b of the liquid nitrogen discharge passages 90a and 90b. Is discharged to the nitrogen buffer tank 210 by gravity.
- the nitrogen buffer tank 210 may be disposed at the same level as the jacket tubes 71a and 71b or above the jacket tubes 71a and 71b. In that case, in order to discharge the liquid nitrogen in the jacket tubes 71a and 71b to the nitrogen buffer tank 210, it is necessary to provide a pump in the liquid nitrogen discharge passages 90a and 90b. Further, instead of providing a pump, the liquid nitrogen in the jacket tubes 71a and 71b may be discharged to the nitrogen buffer tank 210 by pressurizing the gas phase portions in the jacket tubes 71a and 71b.
- the downstream end of the branched liquid nitrogen supply passage 201 branched from the liquid nitrogen supply passage 77a (see FIG. 2) connected to the liquid nitrogen supply source 76 is also connected to the nitrogen buffer tank 210.
- the liquid nitrogen supply flow rate from the liquid nitrogen supply source 76 to the nitrogen buffer tank 210 is controlled to set the liquid level of liquid nitrogen stored in the nitrogen buffer tank 210 to a predetermined value.
- a flow control valve 202 is provided to control the level.
- the inside of the nitrogen buffer tank 210 consists of two layers of liquid nitrogen and nitrogen gas, and the liquid level of liquid nitrogen is detected by a liquid level gauge 203 as a liquid level detector.
- the flow rate control valve 202 controls the supply flow rate of liquid nitrogen so that the liquid level of liquid nitrogen in the nitrogen buffer tank 210 becomes a predetermined level based on the detection result of the liquid level gauge 203.
- the nitrogen gas discharge passages 79a and 79b are arranged so that the downstream ends are inserted into the liquid of the nitrogen buffer tank 210, the nitrogen gas recovered through the nitrogen gas discharge passages 79a and 79b is in the liquid. Since it is introduced, the liquid nitrogen liquid level in the nitrogen buffer tank 210 is shaken. Therefore, it becomes difficult to accurately detect the liquid level of liquid nitrogen in the nitrogen buffer tank 210 by the liquid level gauge 203. Therefore, the nitrogen gas discharge passages 79a and 79b are preferably arranged so that the nitrogen gas is introduced into the gas phase portion of the nitrogen buffer tank 210 as shown in FIG.
- the nitrogen buffer tank 210 is connected to a discharge passage 204 for releasing the internal nitrogen gas to the atmosphere.
- the discharge passage 204 is provided with a pressure gauge 205 that detects the internal pressure of the nitrogen buffer tank 210 and a pressure control valve 206 that controls the internal pressure of the nitrogen buffer tank 210.
- the pressure control valve 206 controls the internal pressure of the nitrogen buffer tank 210 to be a predetermined pressure based on the detection result of the pressure gauge 205.
- the internal pressure of the nitrogen buffer tank 210 is controlled to be 0.4 MPa, and when the internal pressure is 0.4 MPa or more, the valve is opened and the internal nitrogen gas is released to the atmosphere through the discharge passage 204. To do.
- the nitrogen buffer tank 210 collects and discharges nitrogen gas and liquid nitrogen discharged and used for the solidification of the hydrogen fluoride gas in the cooling devices 70a and 70b of the purification device 16. Gas and liquid nitrogen are stored in a state where the liquid level and internal pressure of the nitrogen buffer tank 210 are controlled.
- the nitrogen buffer tank 210 is connected to a utility gas supply passage 207 for supplying internal nitrogen gas as utility gas used in various places of the fluorine gas generation device 100.
- the utility gas supply passage 207 is formed to be branched into a plurality of parts on the way, and nitrogen gas is used in various places of the fluorine gas generator 100. The following is mentioned as a utilization place of nitrogen gas.
- the gas is supplied to the second air chamber 12a and reused as a dilution gas for preventing explosion that reduces the concentration of hydrogen gas (see FIG. 1).
- the supply destination of the dilution gas is not limited to the second air chamber 12a, and may be supplied to any by-product gas processing system 3.
- the nitrogen gas and liquid nitrogen temporarily stored in the nitrogen buffer tank 210 are reused as utility gas at various places in the fluorine gas generation apparatus 100.
- the exhausted nitrogen gas and liquid nitrogen used for the solidification of hydrogen fluoride gas in the purifier 16 are reused as utility gases used in various places of the fluorine gas generator 100 without being discharged to the outside. Is done. Therefore, liquid nitrogen used for purification of fluorine gas can be effectively used.
- the nitrogen gas and liquid nitrogen discharged from the cooling devices 70a and 70b of the purification device 16 are recovered by the nitrogen buffer tank 210, and then the nitrogen gas is removed at various points of the fluorine gas generation device 100. It is for reuse.
- the nitrogen gas and liquid nitrogen discharged from the cooling devices 70 a and 70 b may be directly reused at various points in the fluorine gas generation device 100. In that case, it is necessary to provide a heater on the downstream side of the liquid nitrogen discharge passages 90a and 90b and heat it to gasify the liquid nitrogen.
- the method of recovering the nitrogen gas and liquid nitrogen discharged from the cooling devices 70a and 70b in the nitrogen buffer tank 210 can stably supply the nitrogen gas to various places, so that it is more than the method of directly reusing it. desirable.
- liquid nitrogen is used as the refrigerant used in the purifier 16.
- the refrigerant is not limited to liquid nitrogen, and liquid argon or the like may be used.
- the gas stored in the second buffer tank 50 is used as the fluorine gas used in the regeneration process.
- the fluorine gas stored in the first buffer tank 21 may be used as the fluorine gas used in the regeneration step.
- the fluorine gas supply passage 54 is connected to the first buffer tank 21.
- the pressure of the first buffer tank 21 is likely to fluctuate, and the pressure of the fluorine gas supplied to the external device 4 may fluctuate. Therefore, it is preferable to use the fluorine gas stored in the second buffer tank 50 as the fluorine gas used in the regeneration process as in the above embodiment.
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Abstract
Description
Claims (3)
- 溶融塩中のフッ化水素を電気分解することによって、フッ素ガスを生成するフッ素ガス生成装置であって、
溶融塩が貯留され、溶融塩に浸漬された陽極にて生成されたフッ素ガスを主成分とする主生ガスが導かれる第1気室と、溶融塩に浸漬された陰極にて生成された水素ガスを主成分とする副生ガスが導かれる第2気室とが溶融塩液面上に分離して区画された電解槽と、
前記電解槽の溶融塩から気化して前記陽極から生成された主生ガスに混入したフッ化水素ガスを冷媒を使用して凝固させて捕集してフッ素ガスを精製する精製装置と、を備え、
前記精製装置にてフッ化水素ガスの凝固のために使用され排出された前記冷媒は、フッ素ガス生成装置の各所で使用されるユーティリティガスとして再利用されるフッ素ガス生成装置。 - 請求項1に記載のフッ素ガス生成装置であって、
前記精製装置は、フッ化水素ガスの凝固のために使用され排出された前記冷媒を回収して一時的に保存するバッファタンクを備えるフッ素ガス生成装置。 - 請求項1に記載のフッ素ガス生成装置であって、
前記精製装置は、
フッ化水素ガスを含む主生ガスが流入するガス流入部と、
主生ガスに混入したフッ化水素ガスが凝固する一方、フッ素ガスは前記ガス流入部を通過するように、フッ素の沸点以上かつフッ化水素の融点以下の温度で前記ガス流入部を前記冷媒を用いて冷却する冷却装置と、を備え、
前記冷却装置から排出された前記冷媒がユーティリティガスとして再利用されるフッ素ガス生成装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US13/520,237 US8864961B2 (en) | 2010-01-05 | 2010-11-30 | Fluorine gas generating apparatus |
EP10842154A EP2522761A1 (en) | 2010-01-05 | 2010-11-30 | Fluorine gas generation apparatus |
CN2010800607527A CN102713009A (zh) | 2010-01-05 | 2010-11-30 | 氟气生成装置 |
KR1020127014864A KR101410861B1 (ko) | 2010-01-05 | 2010-11-30 | 불소 가스 생성 장치 |
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JP2010000532A JP5577705B2 (ja) | 2010-01-05 | 2010-01-05 | フッ素ガス生成装置 |
JP2010-000532 | 2010-01-05 |
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US (1) | US8864961B2 (ja) |
EP (1) | EP2522761A1 (ja) |
JP (1) | JP5577705B2 (ja) |
KR (1) | KR101410861B1 (ja) |
CN (1) | CN102713009A (ja) |
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Cited By (2)
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WO2013092773A1 (en) * | 2011-12-22 | 2013-06-27 | Solvay Sa | Liquid level control in an electrolytic cell for the generation of fluorine |
CN113217817A (zh) * | 2021-04-29 | 2021-08-06 | 中国人民解放军63796部队 | 一种大流量低压在线供气系统 |
Families Citing this family (3)
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KR101411733B1 (ko) * | 2012-07-02 | 2014-06-25 | 최병구 | 삼불화질소 제조 방법 |
JP7367681B2 (ja) * | 2018-09-03 | 2023-10-24 | 株式会社レゾナック | フッ素ガス含有ガスの供給方法及び供給設備 |
US11602815B2 (en) * | 2019-01-31 | 2023-03-14 | Fusion Coolant Systems, Inc. | Machining systems utilizing supercritical fluids |
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- 2010-01-05 JP JP2010000532A patent/JP5577705B2/ja not_active Expired - Fee Related
- 2010-11-30 KR KR1020127014864A patent/KR101410861B1/ko not_active IP Right Cessation
- 2010-11-30 EP EP10842154A patent/EP2522761A1/en not_active Withdrawn
- 2010-11-30 WO PCT/JP2010/071338 patent/WO2011083639A1/ja active Application Filing
- 2010-11-30 US US13/520,237 patent/US8864961B2/en not_active Expired - Fee Related
- 2010-11-30 CN CN2010800607527A patent/CN102713009A/zh active Pending
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JP2011140680A (ja) | 2011-07-21 |
CN102713009A (zh) | 2012-10-03 |
US20130008781A1 (en) | 2013-01-10 |
US8864961B2 (en) | 2014-10-21 |
JP5577705B2 (ja) | 2014-08-27 |
KR20120093341A (ko) | 2012-08-22 |
KR101410861B1 (ko) | 2014-06-23 |
EP2522761A1 (en) | 2012-11-14 |
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