JP7223518B2 - Organic iodine collector - Google Patents

Description

The present invention relates to an organic iodine collector for collecting radioactive organic iodine emitted from a nuclear reactor and organic iodine contained in fluid such as steam.

A filter vent device is installed in a nuclear reactor facility in order to prevent radioactive materials released from the nuclear reactor from leaking into the environment. If the reactor core is damaged due to a nuclear reactor accident or the pressure inside the containment vessel rises abnormally, the containment vessel will be damaged and lead to a large-scale leak, so the steam inside the containment vessel will be vented in advance. When the high-temperature, high-pressure steam is released from the reactor into the containment vessel, it is passed through a filter vent system to remove major radioactive materials before being released into the atmosphere.

Rare gases, aerosols, inorganic iodine, organic iodine, and the like are examples of radioactive materials generated at the time of a nuclear reactor accident. With the filter vent device, these radioactive substances, excluding noble gases, are trapped in the container and prevented from being released to the environment. Generally, a filter vent device holds water (scrubbing water) as a wet filter in a container, as described in Patent Document 1. Moreover, a metal filter as a dry filter is built in the container.

The scrubbing water is an aqueous solution in which sodium thiosulfate, sodium hydroxide, etc. are dissolved, and the vented steam is released into the scrubbing water. Inorganic iodine (elemental iodine) ionized by reaction with sodium thiosulfate and hydrophilic particles that form an aerosol are collected by dissolving in the scrubbing water. Also, the aerosol released into the gas phase adheres to and collides with the metal filter and is collected. Organic iodine is collected by dry filters such as silver zeolite and activated carbon, as described in Patent Document 2.

Japanese Patent Publication No. 2015-522161 JP-A-7-209488

Organic iodine released from nuclear reactors, including methyl iodide, is poorly soluble in water, and even if it is introduced into the pool water or scrubbing water of the pressure suppression chamber during venting, it will not dissolve sufficiently. In addition, organic iodine such as methyl iodide may be newly generated by the reaction of elemental iodine during the exhaust process from the nuclear reactor. For these reasons, organic iodine is a radioactive substance that is difficult to prevent from leaking, so there is a need for a filter vent device capable of collecting organic iodine with high collection efficiency.

As a trapping material for trapping organic iodine, silver zeolite and activated carbon are known (see Patent Document 2). However, since the collection efficiency of these collection materials decreases when moisture adheres thereto, a mechanism for removing moisture is required as in Patent Document 2, which complicates the structure of the filter vent device. In addition, since these trapping materials are required in large quantities, as in Patent Document 2, special device designs and complicated device structures are required, and the cost of the trapping materials themselves increases. Become.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an organic iodine collector capable of efficiently collecting organic iodine with a simple structure.

In order to solve the above problems, an organic iodine collecting apparatus according to the present invention includes a container through which a fluid containing organic iodine is passed, and a first liquid that dissolves the organic iodine and an organic and a second liquid that decomposes iodine, the first liquid being a liquid made of a hydrophilic substance and a liquid made of a hydrophobic substance, the second liquid being a hydrophobic substance and the hydrophilic substance and the hydrophobic substance are ionic liquids or surfactant solutions.

ADVANTAGE OF THE INVENTION According to this invention, the organic iodine collection apparatus which can collect organic iodine efficiently with a simple structure can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the organic iodine collection apparatus which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the organic iodine collection apparatus which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the organic iodine collection apparatus which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the organic iodine collection apparatus which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the organic iodine collection apparatus which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the organic iodine collection apparatus which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typically an example of the organic iodine collection apparatus which concerns on this invention.

Hereinafter, an organic iodine collecting device according to one embodiment of the present invention will be described with reference to the drawings. In addition, the same code|symbol is attached|subjected about the structure which is common in the following each figure, and the overlapping description is abbreviate|omitted.

The organic iodine collection device according to this embodiment includes a container through which gas (fluid) containing organic iodine is passed. At least a dissolving liquid (first liquid) that dissolves the organic iodine and a decomposition liquid (second liquid) that decomposes the organic iodine are held in the container. This organic iodine trapping device traps organic iodine in gas and iodine ions dissociated by decomposing organic iodine in a container using a dissolution liquid and a decomposition liquid as a wet filter. collect.

As the dissolving liquid (first liquid), an ionic liquid, a surfactant solution, a mixed liquid thereof, or the like, which readily dissolves organic iodine, can be used. Organic iodine is sparingly soluble in water and scrubbing water. In addition, the collection efficiency per unit volume of collection materials such as silver zeolite and activated carbon is low, and a large amount is required. On the other hand, when a gas containing organic iodine is passed through a dissolution liquid such as an ionic liquid, the organic iodine dissolves easily, making it difficult for the organic iodine to volatilize from the liquid phase. can be collected.

As the liquid for decomposition (second liquid), an ionic liquid, a surfactant solution, a mixed liquid thereof, or the like, which exhibits an action of decomposing organic iodine, can be used. Decomposing liquids exhibiting such action include liquids having strong Lewis acidity as general chemicals. Such a liquid is usually a polar non-aqueous liquid, and also has the effect of easily dissolving organic iodine. When a gas containing organic iodine is passed through such a liquid for decomposition, the organic iodine is decomposed and dissociated as iodine ions. Since iodine ions are more stable in the liquid phase than organic iodine, collection efficiency by dissolution can be enhanced.

Ionic liquids are particularly preferably used as the dissolving liquid and the decomposing liquid. It is assumed that high-temperature steam of around 160° C. flows into the filter vent device in the event of a nuclear reactor accident. The ionic liquid provides nonvolatility that does not substantially volatilize at 160° C. or less, heat resistance that can withstand high temperatures around 160° C., high radiation resistance, high chemical stability, high electrical stability, and the like. In addition, it is possible to easily control the compatibility with polar molecules and non-polar molecules and control the specific gravity between liquids based on various combinations of ions.

Examples of cations constituting ionic liquids include organic cations such as imidazolium, pyridinium, ammonium, phosphonium, sulfonium, pyrrolidinium, and piperidinium.

Examples of anions constituting the ionic liquid include inorganic anions such as halogen, tetrafluoroborate and hexafluorophosphate, and organic anions such as acetate, sulfonate and imidate. As the anion, halogen, imidate, or tetrafluoroborate is more preferable because it is difficult to cause thermal decomposition or hydrolysis, and it is difficult to change the pH of scrubbing water that may be used together.

As the ionic liquid used as the dissolving liquid, a type comprising a combination of a strongly Lewis acidic cation and a strongly Lewis basic anion is particularly preferable. When such an ionic liquid is used as the dissolving liquid, the solubility of the organic iodine becomes higher and the organic iodine becomes more stable due to interactions in the liquid phase. Therefore, collection efficiency by dissolution can be further increased, and release to the environment by volatilization can be prevented.

As the ionic liquid used as the decomposition liquid, a type composed of an organic cation having a strong Lewis acidity, which is a general chemical, is particularly preferable. Such ionic liquids include types composed of organic cations such as phosphonium, ammonium, pyrrolidinium, and piperidinium. The organic cation may be of a type having a linear carbon chain, a type having a cyclic carbon chain, or the like, but a type having a carbon chain of 6 or more carbon atoms is preferable. When such an ionic liquid is used as the decomposition liquid, the reaction rate of decomposition becomes higher. Therefore, the organic iodine in contact with the decomposition liquid can be reliably ionized and dissolved in the liquid phase.

Each of the dissolving liquid and the decomposing liquid is preferably composed of a combination of liquids that phase-separate from each other at normal temperature of 15 to 25° C. and normal pressure equivalent to atmospheric pressure. With such a combination, the dissolving liquid and the decomposing liquid are separated into two phases and held in the container. Therefore, the decomposition liquid present as a single phase can decompose the organic iodine at a high reaction rate (reaction rate). It is more preferable that each of the dissolving liquid and the decomposing liquid phase-separate from each other even at a high temperature of 160° C. or higher and a high pressure exceeding atmospheric pressure.

Hereinafter, a mode of applying the organic iodine collecting apparatus to a nuclear reactor facility and collecting organic iodine generated in the nuclear reactor will be described.

FIG. 1 is a cross-sectional view schematically showing an example of an organic iodine collecting device according to the present invention.
Fig. 1 shows an example of applying an organic iodine collector to a filter vent device in a nuclear reactor facility and collecting organic iodine contained in steam (fluid) released from a nuclear reactor in a filter vent container. .

As shown in FIG. 1, a filter vent device (organic iodine collection device) 100 according to the present embodiment includes a filter vent container 1, an inlet pipe 7, a metal filter 8, an outlet pipe 9, and an exhaust pipe 10. and have. The filter vent device 100 is connected to the reactor containment vessel 2 by pipelines via a dry well vent pipe 3 , a wet well vent pipe 4 and an inlet pipe 7 .

The reactor containment vessel 2 has a dry well 21 in which a reactor pressure vessel is housed and a wet well 22 in which a pressure suppression pool is formed. The wet well 22 is designed such that steam in the dry well 21 and steam escaped from the main steam system due to overpressure flow into the wet well 22 via a vent pipe (not shown).

The drywell 21 is connected to one end of a drywell vent pipe 3 used for venting gas in the drywell 21 . The dry well vent pipe 3 is provided with a normally closed isolation valve 5 . The other end of the drywell vent pipe 3 is connected to the inlet pipe 7 .

The wet well 22 is also connected to one end of a wet well vent pipe 4 used for venting the gas of the wet well 22 . A normally closed isolation valve 6 is provided in the wet well vent pipe 4 . The other end of wet well vent pipe 4 is connected to inlet pipe 7 .

One end of the inlet pipe 7 is connected to the dry well vent pipe 3 and the wet well pipe 4 , and the other end extends to near the bottom of the filter vent container 1 . The other end of the inlet pipe 7 is attached with a scrubber nozzle (not shown) formed of, for example, multiple venturi nozzles. The scrubber nozzle ejects high-temperature, high-pressure steam released into the reactor containment vessel 2 into the liquid held in the filter vent vessel 1 in the event of a nuclear reactor accident.

A hydrophilic dissolution liquid (first liquid) L10 and a hydrophobic decomposition liquid (second liquid) L20 are held in the container of the filter vent container 1 shown in FIG. The dissolving liquid L10 and the decomposing liquid L20 are injected into the filter vent container 1 to a height at which the tip of the inlet pipe 7 is submerged and a gas phase remains in the upper part of the container.

The dissolving liquid L10 and the decomposing liquid L20 form a multilayer liquid (L10, L20) in the filter vent container 1 without being mixed with each other. The hydrophilic dissolving liquid L10 forms the lower layer and the hydrophobic decomposing liquid L20 forms the upper layer. In the multi-layered liquids (L10, L20), the decomposition liquid L20 is the uppermost layer formed by phase separation between the liquids.

As the dissolution liquid L10, a liquid having a higher specific gravity than the decomposition liquid L20 and made of a hydrophilic substance or an aqueous solution in which a hydrophilic substance is dissolved in water can be used. As the liquid hydrophilic substance, an ionic liquid, a surfactant solution, or the like, which is hydrophilic (easily water-soluble) and liquid at normal temperature and normal pressure, can be used. The liquid hydrophilic substance may be used by dissolving it in desalted water, scrubbing water, or the like.

As the hydrophilic substance to be dissolved in water, an ionic liquid, a surfactant, or the like, which is hydrophilic (easily water-soluble) and solid at normal temperature and normal pressure can be used. Demineralized water, scrubbing water, and the like can be used as the water in which the hydrophilic substance is dissolved. The scrubbing water is obtained by dissolving sodium thiosulfate and an alkali such as sodium hydroxide in water.

Specific examples of the dissolving liquid L10 include 1-butyl-3-methylimidazolium iodide, which is liquid at room temperature and pressure, and 1-butyl-3-methylimidazolium tetrafluoro, which is liquid at room temperature and pressure. Examples include borates and 1-dodecyl-3-methylimidazolium iodide, which is solid (melting point: about 40° C.) at room temperature and pressure.

As the decomposition liquid L20, a liquid having a lower specific gravity than the dissolution liquid L10 and made of a hydrophobic substance can be used. As the hydrophobic substance, an ionic liquid, a surfactant solution, or the like, which is hydrophobic (sparingly water-soluble) and liquid at normal temperature and normal pressure, can be used. Ionic liquids are particularly preferred as the hydrophobic substance.

Specific examples of the decomposition liquid L20 include trihexyl(tetradecyl)phosphonium chloride and trihexyl(tetradecyl)phosphonium dicyanamide.

The filter vent container 1 may be provided with a baffle (not shown) that resists the high-temperature, high-pressure gas (vapor) jetted into the liquid. As the baffle, for example, an orifice-shaped baffle plate, a spiral plate, a perforated plate such as metal mesh or punching metal, or a porous body such as ceramic can be provided in the container. The baffle is preferably provided at a height where at least the upper layer of the liquid held in the container is positioned.

The organic iodine that flows into the filter vent container 1 is presumed to be in a gaseous state. expected to proceed. When a baffle is provided in the filter vent container 1, the retention time of the bubbles ejected into the liquid is increased, and the contact time between the organic iodine and the liquid is increased, so that the collection efficiency of the organic iodine is further improved. can be done.

As shown in FIG. 1, the filter vent container 1 is equipped with a metal filter 8 at the top of the container. The metal filter 8 is formed by laminating metal fibers, metal mesh, or the like. According to the metal filter 8, the aerosol released into the gas phase inside the container is collected by adhesion to metal, collision, or the like.

One end of the outlet pipe 9 is connected to the secondary side of the metal filter 8 and the other end is connected to the exhaust stack 10 . An exhaust stack 10 is provided for releasing into the environment the gas that has been passed through the filter vent container 1 and from which radioactive substances have been removed.

Next, a method for collecting organic iodine using the filter vent device 100 will be specifically described.

In a nuclear reactor, when a serious accident occurs such that the pressure vessel is damaged, various radioactive materials are released into the containment vessel together with high-temperature, high-pressure steam due to the evaporation of cooling water and the like. It is estimated that about 1 kg of radioactive organic iodine will be released in the event of a severe accident in which the containment vessel is damaged, depending on the output of the reactor and the accident scenario. Methyl iodide (CH ₃ I) having volatility is assumed as the main component of organic iodine.

If a serious accident occurs in a nuclear reactor and the pressure inside the containment vessel becomes excessively high, the containment vessel will be damaged and a large-scale leakage of radioactive materials will occur. Therefore, venting is implemented as a measure to prevent such events. In the reactor containment vessel 2 shown in FIG. 1, isolation valves 5 and 6 are opened when it is determined that venting is required.

When the isolation valve 5 is opened, the radioactive substances and high-temperature/high-pressure steam released into the drywell 21 flow into the filter vent container 1 through the drywell vent pipe 3 and the inlet pipe 7 . Also, when the isolation valve 6 is opened, the radioactive substances and high-temperature, high-pressure steam that have flowed into the wetwell 22 flow into the filter vent container 1 through the wetwell vent pipe 4 and the inlet pipe 7 . Then, the vapor containing the radioactive substance is jetted into the filter vent container 1 and introduced into the dissolving liquid L10 on the lower layer side.

In the filter vent container 1, hydrophilic aerosols, inorganic iodine, and organic iodine among the radioactive substances contained in the vapor are dissolved in the hydrophilic dissolution liquid L10 and collected. When the dissolved organic iodine comes into contact with the decomposition liquid L20, it is decomposed into iodine ions and organic matter. The dissociated iodine ions are dissolved in the dissolving liquid L10 or the like and collected. The aerosol released into the gas phase without being collected is collected by the metal filter 8 . After that, the gas from which the radioactive substances have been removed is released into the environment through the exhaust stack 10 .

According to the filter vent device 100 described above, hydrophilic aerosol, inorganic iodine, and organic iodine can be dissolved and collected by the hydrophilic dissolution liquid L10. Then, the organic iodine liberated from fine particles, foreign molecules, etc. can be reacted with the decomposition liquid L20 at a good reaction rate. While organic iodine is volatile, iodine ions are stable in a polar liquid phase. Since the liquid L20 efficiently ionizes the organic iodine, it can be reliably collected in the form of iodine ions while preventing volatilization of the organic iodine. In addition, a general filter vent container can be used for collection, and no large-capacity collection material, dry filter, or special device design or structure is required. Therefore, organic iodine can be efficiently collected with a simple structure.

Further, according to the filter vent device 100 described above, since the hydrophilic dissolving liquid L10 and the hydrophobic decomposing liquid L20 are used together, the hydrophilic dissolving liquid L10 is often hydrophilic. Most of the aerosol can be dissolved and collected, and the hydrophobic decomposition liquid L20 can aggregate and collect the hydrophobic aerosol. Moreover, since the hydrophilic dissolution liquid L10 is used, the radioactive substances contained in the water vapor of the reactor cooling water can be easily trapped in the liquid phase.

In addition, in the filter vent device 100 described above, by using an ionic liquid whose anion is a non-radioactive iodine ion as the dissolution liquid L10 or the decomposition liquid L20, leakage of radioactive substances can be further suppressed. . If the iodine ions are non-radioactive, even if the iodine ions produce elemental iodine after collection, the probability of becoming radioactive elemental iodine is low. Therefore, leakage of radioactive substances due to volatilization of elemental iodine can be further suppressed.

FIG. 2 is a cross-sectional view schematically showing an example of the organic iodine trapping device according to the present invention.
Fig. 2 shows an example of applying the organic iodine collector to a filter vent device in a nuclear reactor facility and collecting the organic iodine contained in the steam (fluid) released from the nuclear reactor in the filter vent container. .

As shown in FIG. 2, the filter vent device (organic iodine collection device) 200 according to the present embodiment includes a filter vent container 1, an inlet pipe 7, a metal filter 8, an outlet pipe 9, and an exhaust pipe 10. and have. The configuration of the filter vent device 200 is the same as the filter vent device 100 except for the type of liquid held in the filter vent container 1 .

A hydrophobic dissolution liquid (first liquid) L11 and a hydrophobic decomposition liquid (second liquid) L20 are held in the container of the filter vent container 1 shown in FIG.

The dissolving liquid L11 and the decomposing liquid L20 form a multi-layered liquid (L11, L20) in the filter vent container 1 without being mixed with each other. The hydrophobic dissolving liquid L11 forms the lower layer and the hydrophobic dissolving liquid L20 forms the upper layer. In the multilayer liquids (L11, L20), the uppermost layer formed by phase separation between the liquids is the decomposition liquid L20.

As the dissolution liquid L11, a liquid having a higher specific gravity than the decomposition liquid L20 and made of a hydrophobic substance can be used. As the hydrophobic substance, an ionic liquid, a surfactant solution, or the like, which is hydrophobic (sparingly water-soluble) and liquid at normal temperature and normal pressure, can be used. Ionic liquids are particularly preferred as the hydrophobic substance.

Specific examples of the dissolving liquid L11 include 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide, and the like. .

As the decomposition liquid L20, a liquid having a lower specific gravity than the dissolution liquid L11 and made of a hydrophobic substance can be used. As the hydrophobic substance, it is possible to use an ionic liquid, a surfactant solution, etc., which has the action of decomposing organic iodine, is hydrophobic (slightly water-soluble), and is liquid at normal temperature and normal pressure. Ionic liquids are particularly preferred as the hydrophobic substance. As the decomposition liquid L20, a liquid having a specific gravity smaller than that of water flowing in as steam is more preferable under the operating temperature conditions of the filter vent container 1. FIG.

Specific examples of the decomposition liquid L20 include trihexyl(tetradecyl)phosphonium chloride and trihexyl(tetradecyl)phosphonium dicyanamide.

In the reactor containment vessel 2 shown in FIG. 2 , when it is determined that venting is necessary, the isolation valves 5 and 6 are opened like the filter vent device 100 . Then, the vapor containing the radioactive substance is jetted into the filter vent container 1 and introduced into the dissolving liquid L11 on the lower layer side.

In the filter vent container 1, among the radioactive substances contained in the steam, the hydrophobic aerosol is precipitated and collected in the hydrophobic dissolution liquid L11. Inorganic iodine and organic iodine are dissolved in the hydrophobic dissolving liquid L11 and collected. When the dissolved organic iodine comes into contact with the decomposition liquid L20, it is decomposed into iodine ions and organic matter. The dissociated iodine ions are dissolved in the dissolving liquid L11 or the like and collected. The aerosol released into the gas phase without being collected is collected by the metal filter 8 . After that, the gas from which the radioactive substances have been removed is released into the environment through the exhaust stack 10 .

According to the filter vent device 200 described above, a part of the aerosol can be precipitated and collected by the hydrophobic dissolution liquid L11, and inorganic iodine and organic iodine can be dissolved and collected. Then, the organic iodine liberated from fine particles, foreign molecules, etc. can be reacted with the decomposition liquid L20 at a good reaction rate. While organic iodine is volatile, iodine ions are stable in a polar liquid phase. Since the liquid L20 efficiently ionizes the organic iodine, it can be reliably collected in the form of iodine ions while preventing volatilization of the organic iodine. In addition, a general filter vent container can be used for collection, and no large-capacity collection material, dry filter, or special device design or structure is required. Therefore, organic iodine can be efficiently collected with a simple structure.

Further, in the filter vent device 200 described above, by using an ionic liquid whose anion is a non-radioactive iodine ion as the dissolution liquid L11 and the decomposition liquid L20, as in the filter vent device 100, radioactive substances Leakage can be further suppressed.

FIG. 3 is a cross-sectional view schematically showing an example of the organic iodine trapping device according to the present invention.
Fig. 3 shows an example of applying the organic iodine collector to the filter vent device of a nuclear reactor facility, and collecting the organic iodine contained in the steam (fluid) released from the nuclear reactor in the filter vent container. .

As shown in FIG. 3, a filter vent device (organic iodine collection device) 300 according to the present embodiment includes a filter vent container 1, an inlet pipe 7, a metal filter 8, an outlet pipe 9, and an exhaust pipe 10. and have. The configuration of the filter vent device 300 is similar to that of the filter vent device 100 except for the type of liquid held in the filter vent container 1 .

Two types of dissolution liquids (first liquids) L10 and L11 and a hydrophobic decomposition liquid (second liquid) L20 are held in the container of the filter vent container 1 shown in FIG. The dissolving liquids L10 and L11 are composed of a combination of a hydrophilic dissolving liquid L10 and a hydrophobic dissolving liquid L11. Thus, the dissolving liquid can be composed of a combination of multiple liquids that phase separate from each other.

The dissolving liquids L10, L11 and the decomposing liquid L20 form multilayered liquids (L11, L10, L20) in the filter vent container 1 without being mixed with each other. The hydrophobic dissolving liquid L11 forms the lower layer, the hydrophilic dissolving liquid L10 forms the intermediate layer, and the hydrophobic dissolving liquid L20 forms the upper layer. In the multi-layered liquids (L11, L10, L20), the decomposition liquid L20 is the uppermost layer formed by phase separation between the liquids.

The dissolving liquid L10 is a liquid having a specific gravity lower than that of the dissolving liquid L11 and higher than that of the decomposition liquid L20, and is composed of a hydrophilic substance or an aqueous solution in which a hydrophilic substance is dissolved in water. can be used. As the liquid hydrophilic substance, an ionic liquid, a surfactant solution, or the like, which is hydrophilic (easily water-soluble) and liquid at normal temperature and normal pressure, can be used. The liquid hydrophilic substance may be used by dissolving it in desalted water, scrubbing water, or the like.

As the hydrophilic substance to be dissolved in water, an ionic liquid, a surfactant, or the like, which is hydrophilic (easily water-soluble) and solid at normal temperature and normal pressure can be used. Demineralized water, scrubbing water, and the like can be used as the water in which the hydrophilic substance is dissolved.

Specific examples of the dissolving liquid L10 include 1-butyl-3-methylimidazolium iodide, which is liquid at room temperature and pressure, and 1-butyl-3-methylimidazolium tetrafluoro, which is liquid at room temperature and pressure. Examples include borates and 1-dodecyl-3-methylimidazolium iodide, which is solid (melting point: about 40° C.) at room temperature and pressure.

As the dissolving liquid L11, a liquid having a higher specific gravity than the dissolving liquid L10 and the decomposition liquid L20 and made of a hydrophobic substance can be used. As the hydrophobic substance, an ionic liquid, a surfactant solution, or the like, which is hydrophobic (slightly water-soluble) and liquid at normal temperature and normal pressure, can be used, but the ionic liquid is particularly preferable.

Specific examples of the dissolving liquid L11 include 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide, and the like. .

As the decomposition liquid L20, a liquid having a lower specific gravity than the dissolution liquid L11 and the decomposition liquid L20 and made of a hydrophobic substance can be used. As the hydrophobic substance, it is possible to use an ionic liquid, a surfactant solution, etc., which has the action of decomposing organic iodine, is hydrophobic (slightly water-soluble), and is liquid at normal temperature and normal pressure. Ionic liquids are particularly preferred as the hydrophobic substance.

Specific examples of the decomposition liquid L20 include trihexyl(tetradecyl)phosphonium chloride and trihexyl(tetradecyl)phosphonium dicyanamide.

In the reactor containment vessel 2 shown in FIG. 3 , when it is determined that venting is necessary, the isolation valves 5 and 6 are opened like the filter vent device 100 . Then, the vapor containing the radioactive substance is jetted into the filter vent container 1 and introduced into the dissolving liquid L11 on the lower layer side.

In the filter vent container 1, among the radioactive substances contained in the steam, the hydrophobic aerosol is precipitated and collected in the hydrophobic dissolution liquid L11. Also, the hydrophilic aerosol is dissolved in the hydrophilic dissolution liquid L10 and collected. Inorganic iodine and organic iodine are dissolved in the hydrophobic dissolving liquid L11 and the hydrophilic dissolving liquid L10 and collected. When the dissolved organic iodine comes into contact with the decomposition liquid L20, it is decomposed into iodine ions and organic matter. The dissociated iodine ions are dissolved in the dissolving liquids L10, L11, etc. and collected. The aerosol released into the gas phase without being collected is collected by the metal filter 8 . After that, the gas from which the radioactive substances have been removed is released into the environment through the exhaust stack 10 .

According to the filter vent device 300 described above, a part of the aerosol can be precipitated and collected by the hydrophobic dissolution liquid L11, and inorganic iodine and organic iodine can be dissolved and collected. In addition, hydrophilic aerosol, inorganic iodine, and organic iodine can be dissolved and collected in the hydrophilic dissolution liquid L10. Then, the organic iodine liberated from fine particles, foreign molecules, etc. can be reacted with the decomposition liquid L20 at a good reaction rate. Whereas organic iodine is volatile, iodine ions are stable in a polar liquid phase, the top layer of the multilayer liquid (L11, L10, L20) is the decomposition liquid L20, and the top layer Since the decomposition liquid L20 efficiently ionizes the organic iodine, it can be reliably collected in the form of iodine ions while preventing volatilization of the organic iodine. In addition, a general filter vent container can be used for collection, and no large-capacity collection material, dry filter, or special device design or structure is required. Therefore, organic iodine can be efficiently collected with a simple structure.

Further, according to the filter vent device 300 described above, since the hydrophilic dissolving liquid L10 and the hydrophobic dissolving liquid L11 or the hydrophobic dissolving liquid L20 are used in combination, the hydrophilic dissolving liquid L10 can Most of the aerosol, which is often hydrophilic, can be dissolved and collected, and the hydrophobic aerosol can be aggregated and collected with the hydrophobic dissolution liquid L11 and the hydrophobic decomposition liquid L20. Moreover, since the hydrophilic dissolution liquid L10 is used, the radioactive substances contained in the water vapor of the reactor cooling water can be easily captured.

Further, in the above filter vent device 300, by using ionic liquids whose anions are non-radioactive iodine ions as the dissolution liquids L10 and L11 and the decomposition liquid L20, similarly to the filter vent device 100, radioactive Leakage of substances can be further suppressed.

FIG. 4 is a cross-sectional view schematically showing an example of the organic iodine trapping device according to the present invention.
FIG. 4 shows an example of applying the organic iodine collector to a filter vent device in a nuclear reactor facility and collecting the organic iodine contained in the steam (fluid) released from the nuclear reactor in the filter vent container. .

As shown in FIG. 4, a filter vent device (organic iodine collection device) 400 according to the present embodiment includes a filter vent container 1, an inlet pipe 7, a metal filter 8, an outlet pipe 9, and an exhaust pipe 10. and have. The configuration of the filter vent device 400 is similar to that of the filter vent device 100 except for the type of liquid held in the filter vent container 1 .

A hydrophilic dissolution liquid (first liquid) L10 and two types of decomposition liquids (second liquids) L20 and L21 are held in the container of the filter vent container 1 shown in FIG. The decomposition liquids L20 and L21 are composed of a combination of liquids having different specific gravities. It is configured in combination with the decomposition liquid L21. Thus, the decomposition liquid can be composed of a combination of liquids that phase separate from each other.

The dissolving liquid L10 and the decomposing liquids L20, L21 form multilayered liquids (L21, L10, L20) in the filter vent container 1 without being mixed with each other. The hydrophobic decomposition liquid L21 forms the lower layer, the hydrophilic dissolution liquid L10 forms the intermediate layer, and the hydrophobic decomposition liquid L20 forms the upper layer. In the multi-layered liquids (L21, L10, L20), the uppermost layer formed by phase separation between the liquids is the decomposing liquid L20.

The dissolution liquid L10 is a liquid having a specific gravity smaller than that of the decomposition liquid L21 and greater than that of the decomposition liquid L20, and is composed of a hydrophilic substance or an aqueous solution in which a hydrophilic substance is dissolved in water. can be used. As the liquid hydrophilic substance, an ionic liquid, a surfactant solution, or the like, which is hydrophilic (easily water-soluble) and liquid at normal temperature and normal pressure, can be used. The liquid hydrophilic substance may be used by dissolving it in desalted water, scrubbing water, or the like.

As the hydrophilic substance to be dissolved in water, an ionic liquid, a surfactant, or the like, which is hydrophilic (easily water-soluble) and solid at normal temperature and normal pressure can be used. Demineralized water, scrubbing water, and the like can be used as the water in which the hydrophilic substance is dissolved.

Specific examples of the dissolving liquid L10 include 1-butyl-3-methylimidazolium iodide, which is liquid at room temperature and pressure, and 1-butyl-3-methylimidazolium tetrafluoro, which is liquid at room temperature and pressure. Examples include borates and 1-dodecyl-3-methylimidazolium iodide, which is solid (melting point: about 40° C.) at room temperature and pressure.

As the decomposition liquid L20, a liquid having a lower specific gravity than the decomposition liquid L21 and the dissolution liquid L10 and made of a hydrophobic substance can be used. As the hydrophobic substance, it is possible to use an ionic liquid, a surfactant solution, etc., which has the action of decomposing organic iodine, is hydrophobic (slightly water-soluble), and is liquid at normal temperature and normal pressure. Ionic liquids are particularly preferred as the hydrophobic substance.

Specific examples of the decomposition liquid L20 include trihexyl(tetradecyl)phosphonium chloride and trihexyl(tetradecyl)phosphonium dicyanamide.

As the decomposition liquid L21, a liquid having a higher specific gravity than the dissolution liquid L10 and the decomposition liquid L20 and made of a hydrophobic substance can be used. As the hydrophobic substance, it is possible to use an ionic liquid, a surfactant solution, etc., which has the action of decomposing organic iodine, is hydrophobic (slightly water-soluble), and is liquid at normal temperature and normal pressure. Ionic liquids are particularly preferred as the hydrophobic substance.

Specific examples of the decomposition liquid L21 include 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide.

In the reactor containment vessel 2 shown in FIG. 4 , when it is determined that venting is necessary, the isolation valves 5 and 6 are opened like the filter vent device 100 . Then, the vapor containing radioactive substances is jetted into the filter vent container 1 and introduced into the decomposition liquid L21 on the lower layer side.

In the filter vent container 1, among the radioactive substances contained in the vapor, the hydrophobic aerosol is precipitated and collected in the hydrophobic decomposition liquid L21. Also, the hydrophilic aerosol is dissolved in the hydrophilic dissolution liquid L10 and collected. Inorganic iodine and organic iodine are dissolved in the hydrophobic decomposition liquid L21 and the hydrophilic dissolution liquid L10 and collected. When the dissolved organic iodine comes into contact with the decomposition liquids L20 and L21, it is decomposed into iodine ions and organic matter. The dissociated iodine ions are dissolved in the dissolving liquid L10 or the like and collected. The aerosol released into the gas phase without being collected is collected by the metal filter 8 . After that, the gas from which the radioactive substances have been removed is released into the environment through the exhaust stack 10 .

According to the filter vent device 400 described above, a part of the aerosol can be precipitated and collected by the hydrophobic decomposition liquid L21, and inorganic iodine and organic iodine can be dissolved and collected. In addition, hydrophilic aerosol, inorganic iodine, and organic iodine can be dissolved and collected in the hydrophilic dissolution liquid L10. Then, the organic iodine liberated from fine particles, foreign molecules, etc. can be reacted with the decomposing liquids L20 and L21 at a good reaction rate. Whereas organic iodine is volatile, iodine ions are stable in a polar liquid phase, the top layer of the multilayer liquid (L21, L10, L20) is the decomposition liquid L20, and the top layer Since the decomposition liquid L20 efficiently ionizes the organic iodine, it can be reliably collected in the form of iodine ions while preventing volatilization of the organic iodine. In addition, a general filter vent container can be used for collection, and no large-capacity collection material, dry filter, or special device design or structure is required. Therefore, organic iodine can be efficiently collected with a simple structure.

Further, according to the filter vent device 400 described above, since the hydrophilic dissolving liquid L10 and the hydrophobic decomposing liquids L20 and L21 are used in combination, the hydrophilic dissolving liquid L10 is hydrophilic. Most of the large amount of aerosol can be dissolved and collected, and the hydrophobic aerosol can be aggregated and collected by the hydrophobic decomposition liquids L20 and L21. Moreover, since the hydrophilic dissolution liquid L10 is used, the radioactive substances contained in the water vapor of the reactor cooling water can be easily captured.

Further, in the filter vent device 400 described above, by using an ionic liquid whose anions are non-radioactive iodine ions as the dissolution liquid L10 and the decomposition liquids L20 and L21, radioactive Leakage of substances can be further suppressed.

FIG. 5 is a cross-sectional view schematically showing an example of the organic iodine trapping device according to the present invention.
FIG. 5 shows an example of applying the organic iodine collection device to a filter vent device of a nuclear reactor facility and collecting the organic iodine contained in the steam (fluid) released from the nuclear reactor in the filter vent container. .

As shown in FIG. 5, a filter vent device (organic iodine collection device) 500 according to the present embodiment includes a filter vent container 1, an inlet pipe 7, a metal filter 8, an outlet pipe 9, and an exhaust pipe 10. , storage containers 11 and 21 , injection pipes 12 and 22 , and automatic on-off valves 13 and 23 . The filter vent device 500 is connected to the reactor containment vessel 2 by pipelines via a dry well vent pipe 3 , a wet well vent pipe 4 and an inlet pipe 7 .

The storage containers 11 and 21 are provided for the purpose of storing the dissolving liquid and the decomposing liquid until venting. As the storage containers 11 and 21, a plurality of containers are provided for each liquid. The filter vent device 500 is provided with two containers, the first storage container 11 and the second storage container 21, for each of the two types of liquids that are injected and held in the container.

The injection tubes 12 , 22 are connected at one end to the storage containers 11 , 21 and at the other end to the filter vent container 1 . As the injection pipes 12 and 22, a plurality of pipes are provided for each storage container.

The first injection pipe 12 communicates between the inside of the first storage container 11 and the inside of the filter vent container 1 , and opens at the bottom side inside the filter vent container 1 . An intermediate portion of the first injection pipe 12 is provided with a normally closed first automatic on-off valve 13 . Further, the second injection pipe 22 communicates the inside of the second storage container 21 and the inside of the filter vent container 1 , and opens at a position higher than the opening of the first injection pipe 12 inside the filter vent container 1 . . An intermediate portion of the second injection pipe 22 is provided with a normally closed second automatic on-off valve 23 .

When using the filter vent device 500, the first storage container 11 is prepared with, for example, a hydrophilic dissolving liquid L10 with a high specific gravity or a hydrophobic dissolving liquid L11 with a high specific gravity. Also, in the second storage container 21, for example, a hydrophobic decomposing liquid L20 with a small specific gravity is prepared. The filter vent container 1 is kept empty. In the first storage container 11, a liquid hydrophilic substance may be prepared as the hydrophilic dissolution liquid L10, or an aqueous solution in which a solid hydrophilic substance is dissolved may be prepared.

In the filter vent device 500, the automatic on-off valves 13 and 23 are opened immediately before the isolation valves 5 and 6 are opened when venting is performed. Although there are no particular restrictions on the opening of the first automatic opening/closing valve 13 and the opening of the second automatic opening/closing valve 23, the opening timing is staggered so that the first automatic opening/closing valve 13 and the second automatic opening/closing valve 23 are opened in this order. preferably. When the liquids are poured into the filter vent container 1 in the order of their specific gravities, phase separation between the liquids is quickly completed and a state suitable for collection is obtained. Appropriate filter venting can thus be initiated quickly.

When the first automatic on-off valve 13 and the second automatic on-off valve 23 are opened, the dissolving liquids L10 and L11 prepared in the first storage container 11 and the decomposition liquid L20 prepared in the second storage container 21 are , respectively, are injected into the filter vent container 1 . For liquid injection, for example, water head pressure or gas pressure such as nitrogen gas can be used.

In the filter vent container 1 shown in FIG. 5, the liquid held in the container is the multilayer liquid (L10, L20) shown in FIG. 1 or the multilayer liquid (L11, L20) shown in FIG. When the isolation valves 5 and 6 are opened, the steam containing radioactive substances is ejected into the filter vent container 1 and introduced into the dissolution liquids L10 and L11 on the lower layer side. Organic iodine and the like contained in the vapor are collected in the container.

According to the filter vent device 500 described above, the dissolving liquids L10 and L11 and the decomposing liquid L20 are prepared in a storage container different from the filter vent container 1. and the decomposition liquid L20 can be properly stored. If the ionic liquid or the like is isolated from the atmosphere and moisture and stored, deterioration due to hydrolysis or the like is suppressed until the venting is performed, so the inspection and management required to maintain the quality of the liquid can be reduced.

FIG. 6 is a cross-sectional view schematically showing an example of the organic iodine trapping device according to the present invention.
FIG. 6 shows an example of applying the organic iodine trapping device to a filter vent device of a nuclear reactor facility and trapping the organic iodine contained in the steam (fluid) released from the nuclear reactor in the filter vent container. .

As shown in FIG. 6, a filter vent device (organic iodine collection device) 600 according to the present embodiment includes a filter vent container 1, an inlet pipe 7, a metal filter 8, an outlet pipe 9, and an exhaust pipe 10. , storage containers 11 , 21 , 31 , injection pipes 12 , 22 , 32 , and automatic on-off valves 13 , 23 , 33 . The filter vent device 600 is connected to the reactor containment vessel 2 by pipelines via a dry well vent pipe 3 , a wet well vent pipe 4 and an inlet pipe 7 .

The configuration of the filter vent device 600 is such that three systems consisting of a storage container, an injection pipe, and an automatic on-off valve are provided for each of the three types of liquid injected and held in the container. It is similar to the vent device 500 . A system including a third storage container 31 , a third injection pipe 32 , and a third automatic on-off valve 33 is added to the filter vent device 600 . The third injection pipe 32 communicates the inside of the third storage container 31 and the inside of the filter vent container 1 , and opens at a position higher than the opening of the second injection pipe 22 inside the filter vent container 1 .

When using the filter vent device 600, the first storage container 11 is prepared with, for example, a hydrophobic dissolution liquid L11 with a large specific gravity or a hydrophobic decomposition liquid L21 with a large specific gravity. Also, in the second storage container 21, for example, a hydrophilic dissolution liquid L10 having a smaller specific gravity is prepared. Further, in the third storage container 31, for example, a hydrophobic decomposing liquid L20 having a smaller specific gravity is prepared. The filter vent container 1 is kept empty. In the second storage container 21, a liquid hydrophilic substance may be prepared as the hydrophilic dissolution liquid L10, or an aqueous solution in which a solid hydrophilic substance is dissolved may be prepared.

In the filter vent device 600, the automatic on-off valves 13, 23, 33 are opened immediately before the isolation valves 5, 6 are opened when venting is performed. Before and after the opening of the first automatic opening/closing valve 13, the second automatic opening/closing valve 23, and the third automatic opening/closing valve 33 is not particularly limited, but the timing of opening is staggered, and the first automatic opening/closing valve 13, the second automatic opening/closing valve It is preferable to open the automatic on-off valve 23 and the third automatic on-off valve 33 in this order. When the liquids are poured into the filter vent container 1 in the order of their specific gravities, phase separation between the liquids is quickly completed and a state suitable for collection is obtained. Appropriate filter venting can thus be initiated quickly.

When the first automatic on-off valve 13, the second automatic on-off valve 23, or the third automatic on-off valve 33 is opened, the dissolution liquid L11 or the decomposition liquid L21 prepared in the first storage container 11 and the second storage container The dissolving liquid L10 prepared in 21 and the decomposition liquid L20 prepared in the third storage container 31 are each injected into the filter vent container 1 . For liquid injection, for example, water head pressure or gas pressure such as nitrogen gas can be used.

In the filter vent container 1 shown in FIG. 6, the liquid held in the container is the multi-layered liquid (L11, L10, L20) shown in FIG. 3 or the multi-layered liquid (L21, L10, L20) shown in FIG. becomes. When the isolation valves 5 and 6 are opened, the vapor containing radioactive substances is ejected into the filter vent container 1 and introduced into the dissolution liquid L11 and decomposition liquid L21 on the lower layer side. Organic iodine and the like contained in the vapor are collected in the container.

According to the filter vent device 600 described above, the dissolving liquids L10 and L11 and the decomposition liquids L20 and L21 are prepared in a storage container different from the filter vent container 1. , L11 and the decomposition liquids L20 and L21 can be properly stored. If the ionic liquid or the like is isolated from the atmosphere and moisture and stored, deterioration due to hydrolysis or the like is suppressed until the venting is performed, so the inspection and management required to maintain the quality of the liquid can be reduced.

FIG. 7 is a cross-sectional view schematically showing an example of the organic iodine trapping device according to the present invention.
FIG. 7 shows an example in which the organic iodine trapping device is applied inside a nuclear reactor containment vessel and the organic iodine contained in the steam (fluid) released from the nuclear reactor is trapped in the wetwell.

As shown in FIG. 7, the filter vent device (organic iodine collection device) 700 according to the present embodiment is configured such that the wet well 22 of the containment vessel 2 functions as a container for collecting organic iodine. It is configured.

The wet well 22 communicates with the dry well 21 housing the reactor pressure vessel through a vent pipe (not shown). A vent pipe (not shown) branched from the main steam system is connected to the wet well 22 via a relief valve. The dry well 21 and the wet well 22 are connected to the filter vent container 1 via pipelines.

The wet well 22 shown in FIG. 7 holds a dissolving liquid (first liquid) L10 and a decomposition liquid (second liquid) L20. The wet well 22 allows the steam in the dry well 21 and the steam escaped from the main steam system due to excess pressure to flow through a vent pipe (not shown) and pass toward the filter vent container 1 . ing. On the other hand, in the container of the filter vent container 1, for example, scrubbing water L30 is held.

As the dissolving liquid L10 held in the wet well 22, for example, an aqueous solution obtained by dissolving a hydrophilic substance that is hydrophilic (easily water-soluble) and solid at normal temperature and normal pressure in pool water can be used. As the decomposition liquid L20 held in the wet well 22, for example, a liquid made of a hydrophobic substance that is hydrophobic (slightly water-soluble) and liquid at normal temperature and normal pressure can be used.

In the filter vent device 700, whether or not the radioactive substances and high-temperature/high-pressure steam released to the dry well 21, or the radioactive substances and high-temperature/high-pressure steam escaped from the main steam system due to overpressure, should be vented. Regardless, it flows into the wetwell 22 .

For example, when vapor containing a radioactive substance is released into the drywell 21, it is introduced into the dissolution liquid L10 on the lower layer side via a horizontal vent pipe (not shown) that penetrates the floor and communicates with the pressure suppression pool. be done. In addition, when steam containing radioactive substances is released from the main steam system by overpressure, it is introduced into the dissolution liquid L10 on the lower layer side via a vent pipe (not shown) whose tip is submerged in a pressure suppression pool. .

In the wet well 22, the organic iodine and the like contained in the vapor are dissolved and collected in the pressure suppression pool of the wet well 22 by the dissolving liquid L10 and the decomposition liquid L20. Aerosols, elemental iodine, and the like that have not been collected and are released into the gas phase flow into the filter vent container 1 through the wet well vent pipe 4 and the inlet pipe 10, and are collected by the scrubbing water L30 and the metal filter 8.

According to the filter vent device 700 described above, the dissolution liquid L10 and the decomposition liquid L20 held in the wet well 22 capture organic iodine and the like within the containment vessel boundary regardless of whether or not venting is performed. can be collected. The volatile organic iodine is decomposed in the initial stage of the exhaust process, and the organic substances dissociated by the decomposition are also collected, so that leakage of organic radioactive substances can be reduced. The iodine ions trapped in the liquid phase can be re-collected in the filter vent container 1 even if elemental iodine is generated and re-volatilized. Also, the filter vent vessel 1 can be operated under normal conditions using normal scrubbing water instead of ionic liquids or the like.

Although the embodiments of the organic iodine collection device according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications without departing from the technical scope. . For example, the above embodiments are not necessarily limited to having all the configurations described. Also, it is possible to replace part of the configuration of an embodiment with another configuration, or add another configuration to the configuration of a certain embodiment. Moreover, it is also possible to add another configuration, delete a configuration, or replace a part of the configuration of a certain embodiment.

For example, the configuration of the filter vent devices 100, 200, 300, 400 described above and the configuration of the filter vent device 700 described above may be combined to provide collection in both the wetwell 22 and the filter vent vessel 1. Further, by combining the configuration of the filter vent devices 500 and 600 and the configuration of the filter vent device 700, the separately stored liquid may be injected into the wet well 22 when necessary. A storage container may be provided for all liquids or for some liquids.

Further, in the filter vent devices 300 and 400 described above, scrubbing water may be used instead of the hydrophilic dissolving liquid L10. Further, in the filter vent device 600 described above, water or scrubbing water may be injected in advance into the container of the filter vent container 1 . Further, in the filter vent device 700, one or more of the dissolving liquid L10 and the decomposition liquid L20 are held in the container of the filter vent container 1 together with the scrubbing water L30 or instead of the scrubbing water L30. may

In the above-described embodiment, as long as at least two types of liquids, ie, a dissolving liquid that dissolves organic iodine and a decomposition liquid that decomposes organic iodine, are used, the type of liquid and The number, hydrophilicity/hydrophobicity of the liquid, density of the liquid (layering order of the liquid), and the like are not particularly limited, and suitable liquids can be used in combination. For example, three or more types of liquids may be used as the dissolving liquid and the decomposing liquid, or the dissolving liquid may be arranged in the uppermost layer.

Also, in the above-described embodiments, the type of nuclear reactor is not particularly limited. Various types of nuclear reactors such as Boiling Water Reactor (BWR), Advanced Boiling Water Reactor (ABWR), Pressurized Water Reactor (PWR), etc. can be applied to An ionic liquid or the like contaminated with a radioactive substance can be treated and regenerated by, for example, the method described in Japanese Patent Publication No. 2003-507185.

In addition to the filter vent device and the wet well, the organic iodine trapping device according to the present invention also includes other off-gas devices provided in nuclear reactor facilities, storage of nuclear fuel materials including unused nuclear fuel and spent nuclear fuel. It can also be applied to containers, transport containers, storage containers and transport containers for replaced or dismantled core internals, and the like.

1 filter vent vessel 2 reactor containment vessel 21 dry well 22 wet well 3 dry well vent pipe 4 wet well vent pipe 5 isolation valve 6 isolation valve 7 inlet pipe 8 metal filter 9 outlet pipe 10 exhaust stack 100 organic iodine collector L10 dissolving liquid (first liquid)
L20 decomposition liquid (second liquid)

Claims (8)

An organic iodine collector for collecting organic iodine,
A container through which a fluid containing organic iodine is passed,
A multi-layered liquid containing a first liquid that dissolves the organic iodine and a second liquid that decomposes the organic iodine is held in the container,
the first liquid and the second liquid are a combination of liquids that phase separate from each other;
The first liquid is a liquid made of a hydrophilic substance ,
the second liquid is a liquid made of a hydrophobic substance,
The organic iodine collector, wherein the hydrophilic substance and the hydrophobic substance are ionic liquids or surfactant solutions. An organic iodine collector for collecting organic iodine,
A container through which a fluid containing organic iodine is passed,
A multi-layer liquid containing a first liquid that dissolves the organic iodine and a second liquid that decomposes the organic iodine is held in the container,
the first liquid and the second liquid are a combination of liquids that phase separate from each other;
The first liquid is a liquid made of a hydrophobic substance,
The second liquid is a liquid made of a hydrophobic substance having a specific gravity different from that of the first liquid ,
The organic iodine collector, wherein the hydrophobic substance is an ionic liquid or a surfactant solution. An organic iodine collector for collecting organic iodine,
A container through which a fluid containing organic iodine is passed,
A multi-layer liquid containing a first liquid that dissolves the organic iodine and a second liquid that decomposes the organic iodine is held in the container,
the first liquid and the second liquid are a combination of liquids that phase separate from each other;
The first liquid is a combination of a liquid made of a hydrophilic substance and a liquid made of a hydrophobic substance,
The second liquid is a liquid made of a hydrophobic substance having a specific gravity different from that of the first liquid ,
The organic iodine collector, wherein the hydrophilic substance and the hydrophobic substance are ionic liquids or surfactant solutions . An organic iodine collector for collecting organic iodine,
A container through which a fluid containing organic iodine is passed,
A multi-layered liquid containing a first liquid that dissolves the organic iodine and a second liquid that decomposes the organic iodine is held in the container,
the first liquid and the second liquid are a combination of liquids that phase separate from each other;

The first liquid is a liquid made of a hydrophilic substance,
the second liquid is a combination of liquids made of hydrophobic substances having different specific gravities;
The organic iodine collector, wherein the hydrophilic substance and the hydrophobic substance are ionic liquids or surfactant solutions . In the organic iodine collection device according to any one of claims 1 to 4 ,
An organic iodine collecting device, wherein the uppermost layer of the liquid held in the container is the second liquid formed by phase separation. In the organic iodine collection device according to any one of claims 1 to 4 ,
a storage container for storing liquid;
further comprising an injection tube connecting between the storage container and the container;
The organic iodine collecting device, wherein the first liquid and the second liquid are injected from the storage container into the container and held when the fluid is passed through the container. In the organic iodine collection device according to any one of claims 1 to 4 ,
the fluid is steam generated in a nuclear reactor,
The organic iodine collector, wherein the container is a filter vent container for removing radioactive substances. In the organic iodine collection device according to any one of claims 1 to 4 ,
the fluid is steam generated in a nuclear reactor,
The vessel is a nuclear reactor wetwell organic iodine collector.

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