WO2018043711A1 - 二酸化塩素発生装置及び二酸化塩素発生方法 - Google Patents
二酸化塩素発生装置及び二酸化塩素発生方法 Download PDFInfo
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- WO2018043711A1 WO2018043711A1 PCT/JP2017/031599 JP2017031599W WO2018043711A1 WO 2018043711 A1 WO2018043711 A1 WO 2018043711A1 JP 2017031599 W JP2017031599 W JP 2017031599W WO 2018043711 A1 WO2018043711 A1 WO 2018043711A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
- A61L2/20—Gaseous substances, e.g. vapours
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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
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/083—Separating products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0005—Degasification of liquids with one or more auxiliary substances
- B01D19/001—Degasification of liquids with one or more auxiliary substances by bubbling steam through the liquid
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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
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/02—Oxides of chlorine
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C25B1/26—Chlorine; Compounds thereof
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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
- 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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
Definitions
- the present invention relates to a chlorine dioxide generator and a chlorine dioxide generation method, and more particularly to a chlorine dioxide generator and a chlorine dioxide generation method for generating chlorine dioxide by electrolyzing a solution containing chlorite.
- a chlorine dioxide generator that generates chlorine dioxide by electrolyzing an electrolyte containing chlorite.
- a chlorine dioxide generator described in Patent Document 1 includes an electrolytic bath provided with electrodes, and the electrolytic solution in the electrolytic bath in order to degas chlorine dioxide generated by electrolysis and dissolved in the electrolytic solution. Equipped with a deaeration pipe (a bubbling gas supply device) for supplying a degassing gas (bubbling gas) to the chlorine dioxide generated by electrolyzing the electrolytic solution by degassing it in the electrolytic cell
- a deaeration pipe a bubbling gas supply device
- chlorine dioxide is highly water-soluble, and when electrolyzing an electrolyte containing chlorite to generate chlorine dioxide, chlorine dioxide dissolves in the electrolyte immediately after it is generated on the electrode surface, particularly the anode surface. To do. For this reason, if the degassing efficiency is poor, the residence time of chlorine dioxide in the electrolytic solution becomes long, and the side reaction proceeds to reduce the recovery efficiency of chlorine dioxide.
- the electrolytic solution is difficult to circulate in the electrolytic cell, so that the concentration of chlorine dioxide in the electrolytic solution is reduced in the portion where bubbling is performed.
- the present invention has been made in view of such a point, and an object of the present invention is to quickly reduce the concentration of chlorine dioxide in the electrolytic solution to improve the generation efficiency of chlorine dioxide.
- the present invention is directed to an electrode for electrolyzing the electrolytic solution for a chlorine dioxide generator that generates chlorine dioxide by electrolyzing an electrolytic solution containing a chlorite aqueous solution.
- the bubbling gas supply unit for supplying bubbling gas to the electrolytic solution and bubbling the electrolytic solution by the bubbling gas supply device, the electrolytic unit, and the bubbling
- a gas recovery unit for recovering chlorine dioxide, which is located above the gas supply unit and degassed from the electrolyte by bubbling by the bubbling gas supply device; and the electrolysis unit and the gas recovery unit.
- a first flow path and a second flow path connecting the electrolysis section and the gas recovery section so as to form a circulation circuit through which the electrolytic solution circulates.
- the bubbling gas supply unit is located in the first flow path, and the bubbling by the bubbling gas supply device causes the electrolyte in the circulation circuit to pass through the first flow path from the electrolysis unit. It was set as the structure which is arrange
- the electrolyte solution circulates due to the gas lift effect of the bubbling gas supplied by the bubbling gas supply device.
- the electrolyte in the circulation circuit is supplied with a bubbling gas at a bubbling gas supply unit disposed at a position in the first flow path and contains bubbles, so that the apparent specific gravity is reduced. It flows so as to rise in one flow path.
- the bubbling gas is broken at the surface of the electrolyte and separated from the electrolyte (gas-liquid separation), so the electrolyte after the bubbling gas is separated is relatively The specific gravity increases and flows so as to descend in the second flow path. Thereby, circulation of the electrolyte can be generated in the circulation circuit.
- the bubble of the bubbling gas containing chlorine dioxide breaks at the liquid level in the gas recovery unit and moves upward in the gas recovery unit.
- the electrolyte from which the bubbles are removed flows toward the electrolysis section through the second flow path. As a result, chlorine dioxide can be recovered, while the electrolytic solution can be electrolyzed again.
- bubbling causes the electrolyte in the circulation circuit to flow from the electrolysis unit to the gas recovery unit through the first flow path, thereby circulating the entire electrolyte in the circuit. Since the electrolytic solution in which chlorine dioxide is dissolved can be quickly moved to the bubbling gas supply unit, it is possible to suppress an increase in the concentration of chlorine dioxide in the electrolytic solution in the electrolysis unit. In addition, the chlorine dioxide dissolved in the electrolyte is degassed from the bubbling gas supply unit to the gas recovery unit, and recovered as chlorine dioxide gas in the gas recovery unit, so that the electrolyte solution having a high chlorine dioxide concentration is obtained. However, it can suppress flowing into an electrolysis part again. As a result, the chlorine dioxide concentration in the electrolytic solution can be quickly reduced, and the production efficiency of chlorine dioxide can be improved.
- the bubbling gas supply unit is disposed at a position in the first flow path, an increase in the apparent electric resistance of the electrolytic solution due to bubbles entering between the electrodes and a side reaction due to an increase in the electrolytic voltage. Occurrence can be prevented.
- the circulation circuit is formed by connecting the upper end portions and the lower end portions of a pair of upper and lower pipes extending in the vertical direction through horizontal pipes extending in the horizontal direction.
- the first flow path includes at least one upper and lower pipes of the pair of upper and lower pipes and an upper horizontal pipe that connects upper ends of the pair of upper and lower pipes
- the second flow path includes: At least the other upper and lower pipes of the pair of upper and lower pipes, and the gas recovery unit is disposed at a connection portion between the other upper and lower pipes and the upper horizontal pipe, and the bubbling gas supply unit Are disposed in the central part in the vertical direction in the first flow path or in the part below the central part.
- the bubbling gas supply unit is disposed in the central portion in the vertical direction of the first flow path or in the lower portion of the central portion, the bubbling gas is supplied from the lowest possible position in the circulation circuit. It becomes easy to generate the flow of the electrolyte solution by the gas lift effect of the bubbling gas.
- the gas recovery unit is disposed at a connection portion between the other upper and lower pipes and the upper horizontal pipe, the electrolytic solution separated by gas and liquid in the gas recovery unit flows into the second flow immediately after the gas-liquid separation. It will pass through the upper and lower pipes forming the path, and the electrolyte will easily flow toward the electrolysis part via the second flow path. As a result, the generation efficiency of chlorine dioxide can be further improved.
- the circulation circuit is formed by a double tubular pipe having the first flow path as an inner pipe and the second flow path as an outer pipe.
- the heavy tubular pipe is disposed so as to extend in the vertical direction
- the electrolysis section is disposed at the lower end of the double tubular pipe
- the gas recovery section includes the two pipes.
- the bubbling gas supply unit is disposed at a portion near the electrolysis unit in the longitudinal direction of the first flow path.
- This configuration makes it possible to make the overall configuration of the apparatus compact in the horizontal direction.
- the bubbling gas supply unit is disposed at a position closer to the electrolysis unit in the longitudinal direction of the first flow path, the bubbling gas is supplied from the lowest possible position in the circulation circuit. Thus, the flow of the electrolyte due to the gas lift effect is easily generated.
- the bubbling gas supply device is configured to supply the bubbling gas at a flow rate of 1.5 L / min or more when the electrolytic solution is circulated in the circulation circuit. It is desirable.
- the bubbling gas supply device supplies the bubbling gas at a flow rate of 4.0 L / min or more when the electrolytic solution is circulated in the circulation circuit. It is desirable to be configured as follows.
- the electrolytic solution can circulate in the circulation circuit by the gas lift effect of the bubbling gas. As a result, the generation efficiency of chlorine dioxide can be further improved.
- the chlorine dioxide generator further includes a waste liquid recovery device that is connected to the circulation circuit and recovers a part of the electrolytic solution circulating in the circulation circuit as a waste liquid, and the waste liquid recovery device has an activated carbon filter. It is desirable that the collected electrolytic solution is configured to be discharged outside after passing through the activated carbon filter.
- the concentration of chlorite ions which are the raw materials for chlorine dioxide, in the electrolyte solution becomes low. Therefore, it is necessary to newly add an electrolyte solution containing a predetermined concentration of chlorite ions. As a result, the amount of electrolyte in the circulation circuit increases, so that the amount of electrolyte in the circulation circuit needs to be discharged to the outside of the circulation circuit. Since the electrolyte discharged to the outside of the circulation circuit is then discharged into sewage, it is desirable to treat chlorite ions to lower the biochemical oxygen demand (BOD) below the sewage discharge standard. Thus, by using a waste liquid recovery device having an activated carbon filter and reducing the chlorite ions with the activated carbon filter, the electrolyte discharged outside the circulation circuit can be discharged into sewage.
- BOD biochemical oxygen demand
- Another aspect of the present invention is an invention of a chlorine dioxide generating method for generating chlorine dioxide by electrolyzing an electrolytic solution containing a chlorite aqueous solution. Electricity for electrolyzing the electrolytic solution is provided.
- a decomposition unit, a bubbling gas supply unit for bubbling the electrolyte solution, a gas recovery unit for recovering chlorine dioxide deaerated from the electrolyte solution by bubbling, and the bubbling gas supply unit are arranged. And a first flow path for connecting the electrolysis section and the gas recovery section, and a second flow path for connecting the electrolysis section and the gas recovery section separately from the first flow path.
- the above circulation A circulation step of circulating the electrolyte in the circuit; a step of electrolyzing the electrolyte to generate chlorine dioxide; a deaeration step of degassing the generated chlorine dioxide from the electrolyzed electrolyte; And a recovery step of recovering degassed chlorine dioxide.
- the concentration of chlorine dioxide in the electrolytic solution in the electrolysis unit is increased by circulating the entire electrolytic solution in the circulation circuit and quickly moving the electrolytic solution in which chlorine dioxide is dissolved to the bubbling gas supply unit. Therefore, it is possible to quickly reduce the concentration of chlorine dioxide in the electrolytic solution and improve the generation efficiency of chlorine dioxide.
- the electrolytic solution is circulated between the electrolysis unit and the gas recovery unit, and the bubbling gas supply device is used.
- the bubbling generates a flow of the electrolytic solution such that the electrolytic solution in the circulation circuit flows from the electrolysis unit to the gas recovery unit via the first flow path, so that chlorine dioxide generated by electrolysis is dissolved.
- chlorine dioxide generated by electrolysis and dissolved in the electrolyte is degassed from the electrolyte until it is recovered by the gas recovery unit, so that the electrolyte with a high chlorine dioxide concentration is electrolyzed again. It can suppress flowing into the part. As a result, the chlorine dioxide concentration in the electrolytic solution can be quickly reduced, and the production efficiency of chlorine dioxide can be improved.
- FIG. 1 It is the schematic which shows the structure of the chlorine dioxide generator which concerns on Embodiment 1 of this invention. It is a graph showing the production
- FIG. It is a graph showing the production
- FIG. 1 schematically shows a configuration of a chlorine dioxide generator 1 according to the first embodiment.
- This chlorine dioxide generator 1 is a device that generates chlorine dioxide (ClO 2 ) by electrolyzing an electrolytic solution containing an aqueous solution of sodium chlorite (NaClO 2 ) as a chlorite. It is arranged in a sterilization apparatus installed in a place where an unspecified number of people gather, or in a sterilization apparatus installed in a place where sterilization is necessary such as a pharmaceutical factory.
- the chlorine dioxide generator 1 is provided for electrolyzing the electrolytic solution 11 and electrodes 31 and 32, and for deaerating chlorine dioxide from the electrolytic solution electrolyzed by the electrolytic unit 11. Further, a bubbling gas supply unit 12 for supplying a bubbling gas to the electrolytic solution, a pH measuring unit 13 for measuring the pH of the electrolytic solution, and a gas for recovering chlorine dioxide deaerated from the electrolytic solution And a collection unit 14.
- Each of the sections 11 to 14 includes a plurality of pipes 15 so that a circulation circuit 10 in which the electrolytic solution circulates through the electrolysis section 11, the bubbling gas supply section 12, the pH measurement section 13, and the gas recovery section 14 is formed.
- a circulation circuit 10 in which the electrolytic solution circulates through the electrolysis section 11, the bubbling gas supply section 12, the pH measurement section 13, and the gas recovery section 14 is formed.
- the electrolysis unit 11 and the bubbling gas supply unit 12 are connected by the first pipe 15, the bubbling gas supply unit 12 and the pH measurement unit 13 are connected by the second pipe 16, and the pH measurement unit 13
- the gas recovery unit 14 is connected by a third pipe 17, and the gas recovery unit 14 and the electrolysis unit 11 are connected by a fourth pipe 18.
- the circulation circuit 10 is formed by the parts 11 to 14 acting as joints between the pipes.
- the circulation circuit 10 is formed so that the axes of the pipes 15 to 18 are arranged in the same vertical plane, and the electrolysis unit 11 and the bubbling gas supply unit 12 are provided with the circulation circuit.
- the pH measurement unit 13 and the gas recovery unit 14 are disposed at an upper position in the circulation circuit 10.
- the gas recovery unit 14 is disposed at the highest height position of the circulation circuit 10 so that chlorine dioxide can be recovered including bubbling gas.
- the first pipe 15 is disposed so as to extend in the lateral direction so that the electrolysis unit 11 and the bubbling gas supply unit 12 are located at substantially the same height.
- the pipe (second pipe 16 and third pipe 17) that connects the bubbling gas supply unit 12 and the gas recovery unit 14 has bubbles formed from the bubbling gas supplied from the bubbling gas supply unit 12.
- the second pipe 16 is arranged to extend vertically upward from the bubbling gas supply unit 12 toward the pH measurement unit 13, while the third pipe 16 17 is disposed so as to extend in the lateral direction from the pH measurement unit 13 toward the gas recovery unit 14.
- the fourth pipe is arranged to extend vertically downward from the gas recovery unit 14 toward the electrolysis unit 11 so that the electrolyte flows from the gas recovery unit 14 toward the electrolysis unit 11.
- the electrolysis part 11 is arrange
- the upper ends of the second pipe 16 and the fourth pipe 18 are connected to each other through the joint that forms the pH measurement unit 13 and the joint that forms the gas recovery unit 14.
- Horizontal piping upper horizontal piping
- the lower ends of the second piping 16 and the fourth piping 18 are connected to each other via a joint that forms the electrolysis portion 11 and a joint that forms the bubbling gas supply portion 12.
- each of the parts 11 to 14 and each of the pipes 15 to 18 is located at the apex portion and each of the parts 11 to 14
- the pipes 15 to 18 are arranged in a substantially rectangular shape when viewed from the front so that the pipes 15 to 18 are located at the side portions.
- the first pipe 15, the joint that forms the bubbling gas supply unit 12, the second pipe 16, the joint that forms the pH measurement unit 13, and the third pipe 17 form the first flow path 80.
- the fourth pipe 18 constitutes the second flow path 81.
- the position of the bubbling gas supply unit 12 in the circulation circuit 10 is the position of the apex in the circulation circuit 10, that is, the connection between the first pipe 15 and the second pipe 16. It may not be a part, and may be in the 2nd piping 16 if it is a position below the central part of the up-and-down direction of the 1st channel 80, or this central part, for example.
- the position of the electrolysis part 11 does not necessarily need to be the position below the gas recovery part 14 vertically, and if it is a position below the gas recovery part 14, for example, the first pipe 15 and the second pipe 16 may be the position of the joint part connecting the When the electrolysis unit 11 is disposed at a joint portion connecting the first pipe 15 and the second pipe 16, the electrolysis unit 11 and the bubbling gas supply unit 12 are disposed at the same position in the circulation circuit 10. In order to prevent this, the bubbling gas supply unit 12 needs to be disposed in the second pipe 16.
- the position of the gas recovery part 14 is the highest position in the circulation circuit 10, it is not necessarily the apex part in the circulation circuit having a substantially rectangular shape in front view, that is, the fourth pipe 18 as the upper and lower pipes and the upper side. It may not be a connection part with the 3rd piping 17 as piping.
- the electrolysis unit 11 is provided with an anode 31 and a cathode 32 for electrolyzing the electrolytic solution to generate chlorine dioxide.
- the anode 31 and the cathode 32 are respectively connected to a DC power supply 30, and current and voltage are supplied from the DC power supply 30.
- Known materials can be used as the material of the anode 31 and the cathode 32.
- the material of the anode 31 is a material in which noble metal or a noble metal oxide is coated on titanium, and is more preferable.
- a metal coated as a catalyst for the reaction at the anode 31 is used, and the material of the cathode 32 is stainless, more preferably titanium.
- the bubbling gas supply unit 12 faces a part of a bubbling gas supply device 40 that supplies bubbling gas to the electrolytic solution and performs bubbling on the electrolytic solution.
- the bubbling gas supply device 40 includes a gas tank 41 that stores bubbling gas, a bubbler 43 that faces the bubbling gas supply unit 12 and supplies the bubbling gas in the form of foam into the electrolyte, and the gas tank 41 and the bubbler 43. And an air supply pipe 42 to be connected.
- air air
- the bubbling gas is supplied into the gas tank 41 from the outside.
- the gas supply port 43a through which bubbling gas is supplied into the electrolytic solution is formed in a fine hole shape so that the bubbling gas is supplied into the electrolytic solution in the form of bubbles as fine as possible.
- the gas tank 41 is provided with an air pump (not shown). By the air pump, the air in the gas tank 41 is supplied from the gas tank 41 to the electrolyte at a predetermined flow rate via the air supply pipe 42. ing.
- an inert gas such as an argon gas can be used in addition to air.
- the bubbling gas supply device 40 generates a flow in the electrolytic solution in the circulation circuit 10 by bubbling the electrolytic solution. Specifically, in the circulation circuit 10, the electrolyte flows from the electrolysis unit 11 toward the bubbling gas supply unit 12 and then flows from the bubbling gas supply unit 12 toward the gas recovery unit 14 (that is, In FIG. 1, a flow that flows in the clockwise direction in the circulation circuit 10 is generated. As will be described in detail later, the flow rate of the bubbling gas by the bubbling gas supply device 40 is set to a flow rate capable of generating the above flow.
- the pH measuring unit 13 is provided with a pH sensor 50 for detecting the pH of the electrolytic solution. Since a known sensor can be used as the pH sensor 50, detailed description thereof is omitted.
- a partition wall 13a extending in a horizontal plane is provided in the pH measurement unit 13 at a position above the upper edge of the third pipe 17, and the tip of the pH sensor 50 penetrates the partition wall 13a. And facing the electrolyte.
- the partition wall 13 a is provided to facilitate the flow of the electrolyte and the bubbling gas from the pH measurement unit 13 toward the gas recovery unit 14.
- the pH measurement unit 13 is not necessarily provided, and the pH sensor 50 may be disposed in the gas recovery unit 14 or the like, and the pH measurement unit 13 may be omitted from the circulation circuit 10.
- the gas recovery section 14 faces a gas recovery pipe 61 through which chlorine dioxide that has been degassed from the electrolyte by bubbling by the bubbling gas supply device 40 passes.
- One end of the gas recovery pipe 61 faces the gas recovery section 14, and the other end is connected to a duct (not shown) provided separately from the chlorine dioxide generator 1.
- the duct communicates with a place where chlorine dioxide is to be sprayed (in the above-described sterilization apparatus or the like), and chlorine dioxide is discharged through the duct to a place where chlorine dioxide is to be sprayed.
- the gas recovery unit 14 is connected to an electrolytic solution supply unit 20 for supplying a new electrolytic solution into the circulation circuit 10 through an electrolytic solution supply pipe 21.
- the electrolyte solution supply unit 20 includes a NaClO 2 tank 22 in which a sodium chlorite aqueous solution as a main component of the electrolyte solution is stored, and a pH adjuster tank 23 in which a pH adjuster for adjusting the pH of the electrolyte solution is stored. have.
- One end side of the electrolyte solution supply pipe 21 faces the gas recovery unit 14, while the other end side branches into two in the middle, and one of the branched pipes is connected to the NaClO 2 tank 22.
- the other of the branched pipes is connected to the pH adjuster tank 23.
- As the pH adjusting agent for example, an aqueous solution of sodium bicarbonate (NaHCO 3) is used.
- the bubbling gas supplied by the bubbling gas supply device 40 reaches the gas recovery unit 14 from the bubbling gas supply unit 12.
- the chlorine dioxide is sufficiently degassed until it is recovered by the gas recovery unit 14.
- the circulation circuit 10 is connected to a waste liquid recovery unit 70 that recovers a part of the electrolyte flowing in the circulation circuit 10 as a waste liquid.
- the waste liquid recovery unit 70 includes a pump 71, an activated carbon filter 72, and a waste liquid tank 73.
- the circulation circuit 10 and the pump 71 are connected by a first waste liquid pipe 74, and the pump 71 and the activated carbon filter 72 are connected to each other.
- the activated carbon filter 72 and the waste liquid tank 73 are connected by the third waste liquid pipe 76 while being connected by the second waste liquid pipe 75.
- the waste liquid recovery unit 70 is connected to the fourth pipe 18 by the first waste liquid pipe 74.
- the waste liquid recovery unit 70 can be connected to any position of the circulation circuit 10 as long as it can recover the electrolyte circulating in the circulation circuit 10, but after chlorine dioxide is recovered. From the viewpoint of recovering the electrolyte solution, it is desirable to be connected to the fourth pipe 18.
- the activated carbon filter 72 is a filter for reducing chlorite ions (ClO 2 ⁇ ) in the electrolytic solution and chlorine dioxide dissolved in the electrolytic solution.
- the amount of activated carbon in the activated carbon filter 72 and the size of the activated carbon filter 72 are set to such an amount and size that the biochemical oxygen demand (BOD) of the waste liquid is reduced to a value that satisfies a predetermined standard. Yes.
- the operations of the electrolyte supply unit 20, the DC power supply 30, the bubbling gas supply device 40, and the pump 71 are controlled by control units (not shown).
- an aqueous solution of sodium chlorite and an aqueous solution of sodium hydrogen carbonate as a pH adjuster are supplied from the electrolyte supply unit 20 into the circulation circuit 10.
- the aqueous solution of sodium hydrogen carbonate is supplied so that the pH of the electrolytic solution obtained by mixing the aqueous solution of sodium chlorite and the aqueous solution of sodium bicarbonate is about 9.
- the pH may be lower than 9, but if the pH is lower than 7, the chemical reaction may be promoted between sodium chlorite and the pH adjuster. desirable.
- the bubbling gas supply device When the electrolytic solution reaches the upper edge of the third pipe 17 and is filled in the circulation circuit 10 to such an extent that the pH of the electrolytic solution can be detected by the pH sensor 50, then the bubbling gas supply device The air as the bubbling gas is supplied to the electrolytic solution in the circulation circuit 10 by 40. Thereby, in the circulation circuit 10, the electrolyte solution circulates due to the gas lift effect of the bubbling gas supplied by the bubbling gas supply device 40. That is, the electrolyte in the circulation circuit 10 is supplied with the bubbling gas from the bubbling gas supply unit 12 and contains bubbles, so that the apparent specific gravity is reduced.
- the third pipe 17 so as to rise from the height position of the electrolysis section 11 (substantially the same as the height position of the bubbling gas supply section 12) to the height position of the gas recovery section 14.
- the gas recovery unit 14 bubbles of the bubbling gas are broken at the surface of the electrolytic solution and the bubbling gas is separated from the electrolytic solution. Therefore, the electrolytic solution after the bubbling gas is separated has a relative specific gravity.
- Increases and flows in the fourth pipe 18 so as to descend from the height position of the gas recovery section 14 to the height position of the electrolysis section 11.
- the electrolytic solution flows from the electrolysis unit 11 to the gas recovery unit 14 via the first flow path 80, and again from the gas recovery unit 14 via the second flow path 81 to the electrolysis unit. 11 can be generated such that the electrolyte flows.
- the bubbling gas supply device 40 has a flow rate at which the above-described electrolyte flow is generated in the circulation circuit 10, specifically, a flow rate of 4.0 L / min or more. Supply air.
- the flow rate of the bubbling gas is appropriately changed according to the diameter of the first to fourth pipes 15 to 18. Specifically, the flow rate is increased as the diameters of the first to fourth pipes 15 to 18 are increased.
- the electrolytic solution After a flow of the electrolytic solution is generated in the circulation circuit 10 and the electrolytic solution circulates in the circulation circuit, current and voltage are supplied from the DC power source to the anode 31 and the cathode 32 in the electrolysis unit 11. In the electrolysis unit 11, electrolysis of the electrolytic solution is started.
- the current and voltage are set to values at which chlorine dioxide is easily generated at the anode 31. For example, the current is set to about 0.3 A and the voltage is set to about 3 to 4V.
- the electrolytic solution contains an aqueous solution of sodium chlorite, chlorite ions and sodium ions (Na + ) are present in the electrolytic solution in the electrolysis unit 11. Therefore, when direct current is supplied from the direct current power source 30 to the electrolytic solution in the electrolysis unit 11, chlorite ions emit electrons (e ⁇ ) at the anode 31, as shown in the following formula (1). Chlorine dioxide is generated at the anode 31.
- the chlorine dioxide produced at the anode 31 is dissolved in the electrolyte due to its high solubility.
- Chlorine dioxide dissolved in the electrolytic solution flows from the electrolysis unit 11 to the bubbling gas supply unit 12 through the first pipe 15 by the flow of the electrolytic solution in the circulation circuit 10.
- chlorine dioxide dissolved in the electrolytic solution reaches the bubbling gas supply unit 12
- the chlorine dioxide is converted into chlorine dioxide gas as chlorine dioxide gas in accordance with the vapor-liquid equilibrium relationship by the bubbling gas supplied from the bubbling gas supply unit 12. Is degassed.
- Bubbles made of the bubbling gas supplied from the bubbling gas supply unit 12 are transferred from the bubbling gas supply unit 12 to the pH measurement unit through the second pipe 16 by the flow of the electrolytic solution in the circulation circuit 10 together with the degassed chlorine dioxide. It flows to 13.
- the electrolytic solution collides with the partition wall 13 a and changes the flow direction so as to flow from the pH measurement unit 13 toward the gas recovery unit 14. Therefore, bubbles of bubbling gas containing chlorine dioxide also flow from the pH measurement unit 13 toward the gas recovery unit 14 according to the flow of the electrolytic solution.
- Chlorine dioxide dissolved in the electrolytic solution continues to be degassed from the electrolytic solution until the bubble of the bubbling gas reaches the gas recovery unit 14 from the bubbling gas supply unit 12 via the pH measurement unit 13.
- the recovered chlorine dioxide flows from the gas recovery unit 14 to the duct, and is released to the outside through the duct to a place where chlorine dioxide is to be sprayed.
- the concentration of chlorite ions in the electrolytic solution decreases, so a new electrolytic solution is constantly added from the electrolytic solution supply unit 20.
- the electrolytic solution in the circulation circuit 10 increases. Therefore, it is necessary to constantly discharge the electrolytic solution from the circulation circuit 10 by an amount corresponding to the increase in the electrolytic solution. Therefore, a part of the increased electrolytic solution is recovered by the waste liquid recovery unit 70. Specifically, first, a part of the electrolytic solution in the circulation circuit 10 is recovered as waste liquid from the circulation circuit 10 by the pump 71. Next, the recovered waste liquid is made to reach the activated carbon filter 72 through the second waste liquid pipe 75, and the activated carbon filter 72 reduces chlorite ions contained in the waste liquid. Chlorite ions are reduced according to the following formulas (3) and (4).
- the waste liquid after the reduction of chlorite ions flows to the waste liquid tank 73 through the third waste liquid pipe 76 and is stored in the waste liquid tank 73.
- the waste liquid in the waste liquid tank is discharged outside the chlorine dioxide generator 1 by the operator.
- chlorine dioxide is generated by the chlorine dioxide generator 1 and released as chlorine dioxide gas.
- the bubbling gas supply unit 12 is disposed at substantially the same height as the electrolysis unit 11 with the first pipe 15 interposed therebetween, that is, at a position in the first flow path 80. Then, the bubbling by the bubbling gas supply device 40 generates a flow in the electrolytic solution so that the electrolytic solution in the circulation circuit 10 flows from the electrolysis unit 11 to the gas recovery unit 14 via the first flow path 80. Therefore, by performing bubbling by the bubbling gas supply device 40, the flow of the electrolyte can be generated by the gas lift effect of the bubbling gas.
- the electrolysis unit Since the chlorine dioxide generated by electrolysis and dissolved in the electrolyte can be quickly moved to the bubbling gas supply unit 12 by the flow of the electrolyte and deaerated by the bubbling gas, the electrolysis unit It can suppress that the density
- the electrolysis unit 11, the bubbling gas supply unit 12, and the gas recovery unit 14 are separated from each other without performing electrolysis and deaeration in one tank, and the respective units are connected by piping. By doing so, it becomes easy to form the flow of the electrolytic solution by the bubbling gas, and the generation efficiency of chlorine dioxide can be further improved.
- the circulation circuit 10 is formed so that the axes of the pipes 15 to 18 are arranged in the same vertical plane.
- the parts 11 to 14 and the pipes 15 to 18 are arranged in a rectangular shape so that the part 13 and the gas recovery part 14 are located at the apex part and the pipes 15 to 18 are located at the sides. Since the bubbling gas supply unit 12 is disposed in the lower part of the circulation circuit 10, the bubbles made of the bubbling gas supplied by the bubbling gas supply unit 12 can easily spread over the entire radial direction of the second pipe 16. Thus, chlorine dioxide dissolved in the electrolytic solution can be efficiently degassed. As a result, the generation efficiency of chlorine dioxide can be further improved.
- the gas recovery unit 14 is disposed at the connection portion between the third pipe 17 and the fourth pipe 18, the electrolysis that has reached the gas recovery unit 14 via the third pipe 17. Since the liquid collides with the wall portion 14a and the kinetic energy of the electrolytic solution is lost, the chlorine dioxide and the electrolytic solution are easily separated from each other in the gas recovery unit 14. As a result, the generation efficiency of chlorine dioxide can be further improved.
- FIG. 2 shows the generation efficiency of chlorine dioxide when using the chlorine dioxide generator 1 according to the first embodiment and, as a comparative example, electrolysis in one tank without forming a circulation circuit as in the prior art.
- the production efficiency of chlorine dioxide when using an apparatus for performing deaeration (hereinafter referred to as a conventional chlorine dioxide generator) is shown.
- the vertical axis indicates the generation efficiency of chlorine dioxide
- the horizontal axis indicates the molar concentration of chlorite ions in the electrolytic solution.
- the production efficiency of chlorine dioxide is the amount of chlorine dioxide gas actually produced per hour with respect to the theoretical value (mg / hr) of the amount of chlorine dioxide gas produced per hour calculated from the current value. Is the ratio.
- both the generators are made of titanium coated with platinum and the cathodes are made of titanium.
- the current and voltage of both the generators are 0.3A and 3V.
- the bubbling gas is air in both generators, and the flow rate of the bubbling gas is 8.0 L / min in the chlorine dioxide generator 1 and 10.0 L / min in the conventional chlorine dioxide generator.
- the generation efficiency of chlorine dioxide is about 40%, and the molar concentration is 0.40 mol. Even when the concentration is increased to a concentration of 1 / l or more, it can be seen that the generation efficiency of chlorine dioxide is about 60%. This is because, in a configuration in which bubbling gas is supplied to the electrolytic solution in the tank, the electrolytic solution is difficult to circulate in the tank, and the concentration of chlorine dioxide in the electrolytic solution cannot be lowered sufficiently.
- the generation efficiency of chlorine dioxide is about 90%.
- the entire electrolyte in the circulation circuit 10 is easily circulated in the circulation circuit 10, This is because chlorine dioxide generated by electrolysis and dissolved in the electrolytic solution can be quickly degassed to suppress an increase in the concentration of chlorine dioxide in the electrolytic solution in the electrolysis unit 11.
- the generation efficiency of chlorine dioxide is about 45%.
- the production efficiency is higher than the production efficiency of chlorine dioxide by the conventional chlorine dioxide generator.
- FIG. 3 shows the relationship between the flow rate of air blown as a bubbling gas and the generation efficiency of chlorine dioxide when the chlorine dioxide generator 1 according to Embodiment 1 is used.
- the molar concentration of chlorite ions is about 0.50 mol / l.
- the larger the air flow rate the higher the generation efficiency of chlorine dioxide. This is because chlorine dioxide is more easily degassed and the concentration of chlorine dioxide in the electrolytic solution decreases as the flow rate of the blown air increases. That is, when the air flow rate is 3.0 L / min or less, chlorine dioxide is hardly degassed, and the generation efficiency of chlorine dioxide is reduced to 70% or less.
- the flow rate of air is a flow rate at which chlorine dioxide is easily degassed, specifically, 4.0 L / min or more, which is a flow rate at which the generation efficiency of chlorine dioxide exceeds 80%. This ensures a high generation efficiency of chlorine dioxide.
- FIG. 4 schematically shows the configuration of the chlorine dioxide generator 101 according to the second embodiment.
- the first flow path 80 and the second flow path 81 in the circulation circuit 110 are double tubular pipes in which the first flow path 80 is the inner pipe 180 and the second flow path 81 is the outer pipe 181. It differs from the said Embodiment 1 by the point formed by 200 (henceforth the double piping 200).
- the double pipe 200 is disposed so as to extend in the vertical direction, the electrolysis unit 11 is disposed at the lower end of the double pipe 200, and the gas recovery unit 14 is disposed at the upper end of the double pipe 200. Is arranged.
- the bubbling gas supply unit 12 is disposed at a portion near the electrolysis unit 11 in the longitudinal direction of the first flow path 80. Thereby, as shown in FIG. 4, the electrolysis part 11, the bubbling gas supply part 12, and the gas collection
- the first flow path 80 is provided with a portion extending in the lateral direction (corresponding to the first pipe 15 and the third pipe 17 in the first embodiment).
- a portion corresponding to the portion extending in the lateral direction in the first flow 80 is formed so as to extend in the vertical direction. Therefore, the length in the longitudinal direction of the double pipe 200 is set to a length that allows chlorine dioxide to be sufficiently degassed from the electrolyte in the first flow path 80.
- Electrode unit 11 is provided with electrodes composed of anode 31 and cathode 32 as in the first embodiment.
- the materials of the anode 31 and the cathode 32 the same materials as those in the first embodiment can be adopted.
- the bubbling gas supply unit 12 faces a part of the bubbling gas supply device 40 (specifically, the bubbler 43).
- the bubbler 43 faces the bubbling gas supply unit 12 from the lower side.
- the electrolysis unit 11 is located on the lower side of the bubbling gas supply unit 12. It faces the bubbling gas supply unit 12 from the upper side as desired by the bubbling gas supply unit 12 while avoiding the decomposition unit 11.
- the gas recovery section 14 faces a gas recovery pipe 61 through which chlorine dioxide that has been degassed from the electrolyte by bubbling by the bubbling gas supply device 40 passes.
- One end of the gas recovery pipe 61 faces the gas recovery unit 14, and the other end is connected to a duct (not shown) provided separately from the chlorine dioxide generator 101.
- gas recovery unit 14 is connected to the electrolyte solution supply unit 20 through the electrolyte solution supply pipe 21 as in the first embodiment.
- a waste liquid recovery unit 70 that recovers a part of the electrolyte flowing through the circulation circuit 110 as a waste liquid is connected to the outer pipe 181 of the double pipe 200 (that is, the second flow path 81). 70 is provided with an activated carbon filter 72.
- an aqueous solution of sodium chlorite and an aqueous solution of sodium hydrogen carbonate as a pH adjuster are supplied from the electrolyte supply unit 20 into the circulation circuit 110.
- the aqueous solution of sodium hydrogencarbonate was supplied so that the pH of the electrolytic solution obtained by mixing the aqueous solution of sodium chlorite and the aqueous solution of sodium bicarbonate was about 9.
- the bubbling gas supply device 40 When the electrolytic solution is filled in the circulation circuit 110 to such an extent that the liquid level of the electrolytic solution is located above the first waste liquid pipe 74 of the waste liquid collecting unit 70, the bubbling gas supply device 40 then performs bubbling. Air as a gas is supplied to the electrolytic solution in the circulation circuit 110. Thereby, since the apparent specific gravity of the electrolyte in the first flow path 80 is reduced, the inner pipe 180 (in the first flow path 80) is moved from the height position of the electrolysis section 11 to the height of the gas recovery section 14. Flows up to the position.
- the electrolytic solution reaches the upper end portion of the inner pipe 180, that is, the gas recovery unit 14, bubbles of the bubbling gas are broken at the surface of the electrolytic solution, and the bubbling gas is separated from the electrolytic solution (gas-liquid). Separated).
- the gas-liquid separated electrolyte leaks from the upper end of the inner pipe 180 to the outer pipe 181, that is, from the upper end of the first flow path 80 to the second flow path 81. Since the electrolytic solution leaking from the inner tube 180 (first flow channel 80) to the outer tube 181 (second flow channel 81) is an electrolytic solution after gas-liquid separation, the specific gravity becomes relatively large, and the outer tube. It flows in 181 (in the second flow path 81) so as to descend from the height position of the gas recovery section 14 to the height position of the electrolysis section 11. Thereby, circulation of the electrolyte can be generated in the circulation circuit 110.
- the circulation of the electrolyte occurs in the circulation circuit 110 due to the gas lift effect of the bubbling gas supplied by the bubbling gas supply device 40.
- the chlorine dioxide produced at the anode 31 by the electrolysis is dissolved in the electrolytic solution, and the chlorine dioxide dissolved in the electrolytic solution is electrolyzed through the first flow path 80 by the flow of the electrolytic solution in the circulation circuit 110. It flows from the part 11 to the bubbling gas supply part 12.
- chlorine dioxide dissolved in the electrolytic solution reaches the bubbling gas supply unit 12, the chlorine dioxide is converted into chlorine dioxide gas as chlorine dioxide gas in accordance with the vapor-liquid equilibrium relationship by the bubbling gas supplied from the bubbling gas supply unit 12. Is degassed.
- Bubbles made of the bubbling gas supplied from the bubbling gas supply unit 12 are recovered from the bubbling gas supply unit 12 through the first flow path 80 by the flow of the electrolyte in the circulation circuit 110 together with the degassed chlorine dioxide. It flows toward the part 14. Until the gas recovery unit 14 reaches the gas recovery unit 14 from the bubbling gas supply unit 12, deaeration from the electrolytic solution is continued.
- the electrolytic solution When the electrolytic solution reaches the gas recovery unit 14 together with bubbles of bubbling gas containing chlorine dioxide, the bubbles of bubbling gas containing chlorine dioxide break at the liquid level of the electrolytic solution in the gas recovery unit 14 and then recover the gas. It moves upward in the part 14. On the other hand, the electrolytic solution leaks from the first flow path 80 to the second flow path 81 and moves to the electrolysis unit 11 through the second flow path 81.
- the gas-liquid separated chlorine dioxide is recovered through the gas recovery pipe 61 together with the bubbling gas.
- the concentration of chlorite ions in the electrolytic solution decreases, so that a new electrolytic solution is added from the electrolytic solution supply unit 20 and the increased electrolytic solution is added by adding the new electrolytic solution.
- the amount of liquid is collected from the circulation circuit 110 by the waste liquid collection unit 70.
- FIG. 5 shows the generation efficiency of chlorine dioxide when using the chlorine dioxide generator 101 according to the second embodiment, and the generation efficiency of chlorine dioxide when using a conventional chlorine dioxide generator as a comparative example.
- the chlorine dioxide generation efficiency in the graph of FIG. 4 is actually calculated from the theoretical value (mg / hr) of the amount of chlorine dioxide gas generated per hour calculated from the current value. It is the ratio of the amount of chlorine dioxide gas produced per hour.
- both the generators are made of titanium coated with platinum and the cathodes are made of titanium.
- the current and voltage of both the generators are 0.3A and 3V.
- the bubbling gas is air in both the generators, and the flow rate of the bubbling gas is 8.0 L / min in the chlorine dioxide generator 101 and 10.0 L / min in the conventional chlorine dioxide generator.
- the generation efficiency of chlorine dioxide is about 80%.
- the entire electrolytic solution in the circulation circuit 110 is easily circulated in the circulation circuit 110, and is generated by electrolysis and dissolved in the electrolytic solution. This is because it is possible to quickly deaerate the generated chlorine dioxide and suppress an increase in the concentration of chlorine dioxide in the electrolytic solution in the electrolysis unit 11.
- the generation efficiency of chlorine dioxide is less than 80%.
- the production efficiency is higher than the production efficiency of chlorine dioxide by the conventional chlorine dioxide generator when the molar concentration of chlorite ions in the slag is about 0.10 mol / l.
- FIG. 6 shows the relationship between the flow rate of air blown as a bubbling gas and the generation efficiency of chlorine dioxide when the chlorine dioxide generator 101 according to the second embodiment is used.
- the molar concentration of chlorite ions is about 0.50 mol / l.
- the chlorine dioxide generator 101 according to the second embodiment has a chlorine dioxide generation efficiency exceeding 80% in a range of 1.5 L / min or more, and in particular, the air flow rate is 2.0 L / min.
- the generation efficiency of chlorine dioxide is stable at around 90%. That is, in the second embodiment, it was confirmed that stability with high generation efficiency of chlorine dioxide with respect to the flow rate of the blown air was obtained.
- the position near the electrolysis unit 11 in the longitudinal direction of the first flow path 80 that is, the position in the first flow path 80, and bubbling by the bubbling gas supply device 40, Since the electrolytic solution in the circulation circuit 110 is disposed at a position where a flow is generated in the electrolytic solution so as to flow from the electrolysis unit 11 to the gas recovery unit 14 via the first flow path 80, bubbling is performed. Bubbling by the bubbling gas supply device 40 is performed in the gas supply unit 12, and the flow of the electrolytic solution can be generated in the circulation circuit 110 by the gas lift effect by the bubbling gas.
- the electrolysis unit 11 Since the chlorine dioxide generated by electrolysis and dissolved in the electrolyte can be quickly moved to the bubbling gas supply unit 12 by the flow of the electrolyte and deaerated by the bubbling gas, the electrolysis unit 11 It can suppress that the density
- the circulation circuit 10 is disposed in the same plane.
- the present invention is not limited to this, and the gas recovery unit 14 is located above the electrolysis unit 11 and the bubbling gas supply unit 12. If the bubbles made of the bubbling gas supplied by the bubbling gas supply unit 12 reach the gas recovery unit 14 and the gas recovery unit 14 performs gas-liquid separation, the circulation circuit 10 is in the same plane. It does not need to be formed.
- the pump 71 is provided in the waste liquid collection unit 70.
- the present invention is not limited to this, and the electrolyte solution that is circulated in the circulation circuit 10 (110) without the waste liquid collection unit 70 being provided with the pump 71. It may be configured such that a part of the liquid always flows into the waste liquid recovery unit 70.
- sodium chlorite is used as the chlorite, but not limited to this, potassium chlorite or lithium chlorite may be used.
- the present invention is useful for a chlorine dioxide generator and a chlorine dioxide generation method for generating chlorine dioxide by electrolyzing a solution containing chlorite.
Abstract
Description
以下、本発明の実施形態1を図面に基づいて詳細に説明する。
また、電気分解部11内の電解液に直流を供給すると、以下の式(2)に示すように、水素分子が陰極32で電子を得て、陰極32で水素ガス(H2)が発生する。
2O + C → CO2・・・・式(4)
以下、本発明の実施形態2について、図面を参照しながら詳細に説明する。尚、以下の説明において上記実施形態1と共通の部分については、同じ符号を付して、その詳細な説明を省略する。
本発明は、上記実施形態に限られるものではなく、請求の範囲の主旨を逸脱しない範囲で代用が可能である。
10,110 循環回路
11 電気分解部
12 バブリングガス供給部
14 ガス回収部
15 第1配管(横配管)
16 第2配管(上下配管)
17 第3配管(横配管、上側横配管)
18 第4配管(上下配管)
31 陽極(電極)
32 陰極(電極)
40 バブリングガス供給装置
70 廃液回収部(廃液回収装置)
72 活性炭フィルタ
80 第1流路
81 第2流路
180 内管
181 外管
Claims (7)
- 亜塩素酸塩水溶液を含む電解液を電気分解することによって二酸化塩素を発生させる二酸化塩素発生装置であって、
上記電解液を電気分解するための電極が設けられた電気分解部と、
バブリングガス供給装置によって、上記電解液にバブリングガスを供給して、上記電解液に対してバブリングを行うためのバブリングガス供給部と、
上記電気分解部及び上記バブリングガス供給部よりも上側に位置し、上記バブリングガス供給装置によるバブリングにより上記電解液から脱気される、二酸化塩素を回収するためのガス回収部と、
上記電気分解部と上記ガス回収部との間で上記電解液が循環する循環回路が形成されるように、上記電気分解部と上記ガス回収部とを接続する第1流路及び第2流路とを備え、
上記バブリングガス供給部は、上記第1流路内の位置であって、上記バブリングガス供給装置によるバブリングにより、上記循環回路内の電解液が、上記電気分解部から上記第1流路を介して上記ガス回収部へ流れるように、上記電解液の流れを発生させる位置に配設されていることを特徴とする二酸化塩素発生装置。 - 請求項1に記載の二酸化塩素発生装置において、
上記循環回路は、上下方向に延びる一対の上下配管の上端部同士及び下端部同士を、横方向に延びる横配管を介してそれぞれ接続して形成された回路であり、
上記第1流路は、上記一対の上下配管のうちの一方の上下配管及び上記一対の上下配管の上端部同士を接続する上側横配管を少なくとも含み、上記第2流路は、上記一対の上下配管のうちの他方の上下配管を少なくとも含んでおり、
上記ガス回収部は、上記他方の上下配管と上記上側横配管との接続部分に配設されており、
上記バブリングガス供給部は、上記第1流路における上下方向中央部又は該中央部よりも下側の部分に配設されていることを特徴とする二酸化塩素発生装置。 - 請求項1に記載の二酸化塩素発生装置において、
上記循環回路は、上記第1流路を内管とし、上記第2流路を外管とする二重管状の配管によって形成されており、
上記二重管状の配管は、上下方向に延びるように配設されており、
上記電気分解部は、上記二重管状の配管の下側端部に配設されており、
上記ガス回収部は、上記二重管状の配管の上側端部に配設されており、
上記バブリングガス供給部は、上記第1流路における上下方向中央部又は該中央部よりも上記電気分解部に近い側の部分に配設されていることを特徴とする二酸化塩素発生装置。 - 請求項3に記載の二酸化塩素発生装置において、
上記バブリングガス供給装置は、上記電解液を上記循環回路内で循環させる際に、1.5L/min以上の流量で上記バブリングガスを供給するように構成されていることを特徴とする二酸化塩素発生装置。 - 請求項1~3のいずれか1つに記載の二酸化塩素発生装置において、
上記バブリングガス供給装置は、上記電解液を上記循環回路内で循環させる際に、4.0L/min以上の流量で上記バブリングガスを供給するように構成されていることを特徴とする二酸化塩素発生装置。 - 請求項1~5のいずれか1つに記載の二酸化塩素発生装置において、
上記循環回路に接続され、上記循環回路を循環する上記電解液の一部を、廃液として回収する廃液回収装置を更に備え、
上記廃液回収装置は、活性炭フィルタを有し、回収した上記電解液を、該活性炭フィルタを通過させた後、外部に排出するように構成されていることを特徴とする二酸化塩素発生装置。 - 亜塩素酸塩水溶液を含む電解液を電気分解することによって二酸化塩素を発生させる二酸化塩素発生方法であって、
上記電解液に対して電気分解を行うための電気分解部と、上記電解液に対してバブリングを行うためのバブリングガス供給部と、バブリングによって上記電解液から脱気された二酸化塩素を回収するためのガス回収部と、上記バブリングガス供給部が配設されかつ上記電気分解部と上記ガス回収部とを接続する第1流路と、上記第1流路とは別に上記電気分解部と上記ガス回収部とを接続する第2流路とを備えた循環回路において、
上記電解液に対してバブリングを行い、上記電解液が、上記電気分解部から上記第1流路を介して上記ガス回収部まで流れるような上記電解液の流れを発生させて、上記循環回路内で上記電解液を循環させる循環工程と、
上記電解液を電気分解して二酸化塩素を発生させる工程と、
発生した二酸化塩素を、電気分解された電解液から脱気する脱気工程と、
脱気された二酸化塩素を回収する回収工程とを含むことを特徴とする二酸化塩素発生方法。
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KR20190049703A (ko) | 2019-05-09 |
KR102369884B1 (ko) | 2022-03-04 |
CN109642334A (zh) | 2019-04-16 |
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