JP2013056063A - Method and apparatus for detoxicating halogen compound-containing oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for detoxicating halogen compound-containing oil capable of quenching unreacted metal sodium and efficiently purifying dehalogenated oil with a little energy.SOLUTION: The treating apparatus 1 for detoxicating halogen compound-containing oil has: a reaction tank 15 dehalogenating halogen compound in oil to be treated with metal sodium and obtaining dehalogenated oil; an impurity extracting tank 19 mixing the dehalogenated oil and a little amount of water, quenching unreacted metal sodium contained in the dehalogenated oil, dissolving the solid impurity contained in the dehalogenated oil into water and/or taking the same into water; and a coalescer type oil water separator 21 separating oil in the dehalogenated oil discharged from the impurity extracting tank 19.

Description

  The present invention relates to a detoxification treatment method and a detoxification treatment apparatus for a halogen compound-containing oil that detoxifies a halogen compound in oil such as PCB mixed insulating oil with metallic sodium.

  PCB (polychlorinated biphenyl) is nonflammable and excellent in chemical stability and electrical insulation, so it was conventionally used as an insulating oil for electrical equipment, but its use is now prohibited and stored due to its harmfulness. PCBs and waste oils containing PCBs, etc., by July 2016, according to the “Special Measures Law for Promotion of Proper Treatment of Polychlorinated Biphenyl Waste (PCB Special Measures Law)” enacted in 2001 Completion of processing is required.

  Many methods have been proposed for PCB dechlorination techniques, and several methods have been put to practical use. The method of dechlorinating PCB by reacting sodium metal with PCB is used for detoxification treatment of PCB-containing insulating oil, and the treatment plant is also in operation. When metallic sodium and PCB-containing insulating oil are reacted, a treated oil in which PCB is dechlorinated is obtained. Usually, when metal sodium and PCB-containing insulating oil are reacted, metal sodium is added excessively in order to sufficiently reduce the PCB concentration or shorten the reaction time. For this reason, in the treated oil, unreacted metallic sodium remains in addition to reaction products such as sodium chloride, biphenyl, biphenyl polymer, sodium hydroxide and the like produced by the reaction between metallic sodium and PCB.

  Since unreacted metallic sodium is highly active, treated oils containing it are subject to various difficulties in storage, storage, and reuse. For this reason, normally, operation which adds water to processed oil and quenches metallic sodium with water is performed (for example, refer to patent documents 1 and 2). Such quenching operation is also performed in a process of dechlorinating a polychlorinated aromatic compound in oil using an alkali metal other than sodium metal as a reactant (see, for example, Patent Document 3). The quenching operation with water is also an operation for removing solid impurities such as a reaction product contained in the treated oil at the same time (see, for example, Patent Document 4).

JP 2002-212109 A JP 2005-254147 A JP 2001-206857 A JP 2006-193482 A

  When quenching the remaining unreacted alkali metal by adding water to the treated oil, it is often done at the same time to remove solid impurities contained in the treated oil. Of water is added. The treated oil to which water has been added undergoes a neutralization treatment and is left to stand for oil-water separation. Since water cannot be sufficiently separated from the treated oil only by oil / water separation by standing, the treated oil after the oil / water separation is further separated by a distillation operation. By this series of operations, a purified oil from which unreacted alkali metal and solid impurities are separated can be obtained. On the other hand, the water after oil-water separation is separated into solids such as reaction products and water using a dryer, and the water is reused.

  A large amount of water is used to quench unreacted alkali metal, and the conventional method for obtaining purified oil by separating solid impurities from the treated oil requires a large apparatus. Furthermore, energy consumption is also large because distillation and drying operations are required.

  An object of the present invention is to provide a detoxifying treatment method and a detoxifying treatment apparatus for a halogen compound-containing oil that can quench unreacted metallic sodium and efficiently purify a dehalogenated oil with less energy. is there.

  The present invention includes a reaction step of dehalogenating a halogen compound in an oil to be treated with sodium metal to obtain a dehalogenated oil, a predetermined amount of water being added to the dehalogenated oil, and unreacted contained in the dehalogenated oil. In addition to quenching metallic sodium, the solid impurities contained in the dehalogenated oil are dissolved in water and / or incorporated into water, and the desorption is performed using a coalescer type oil-water separator following the impurity extraction step. And a dehalogenating oil refining process including an oil / water separation process for separating water from the halogen oil.

  The method for detoxifying a halogen compound-containing oil according to the present invention comprises quenching unreacted metallic sodium contained in the dehalogenated oil with water, and extracting solid impurities contained in the dehalogenated oil with water. Is provided with a refining step to obtain a refined oil by oil-water separation with a coalescer type oil-water separator, so that unreacted metallic sodium can be quenched and a dehalogenated oil can be purified efficiently with less energy.

  The halogen compound-containing oil detoxification method of the present invention is the halogen compound-containing oil detoxification method, wherein the predetermined amount of water quenches unreacted metallic sodium and removes solid impurities. The viscosity of the water after extraction is a minimum amount of water that can be separated by the coalescer type oil-water separator.

  According to the present invention, the amount of water for quenching unreacted metallic sodium contained in the dehalogenated oil and extracting the solid impurities contained in the dehalogenated oil is very small, so it can be efficiently performed with less energy. Dehalogenated oil can be purified.

  Moreover, the detoxification treatment method for halogen compound-containing oil of the present invention is the detoxification treatment method for halogen compound-containing oil, wherein the oil to be treated is a low-concentration PCB-mixed insulating oil, and the water is dehalogenated oil. 1 wt% is added.

  According to the present invention, when the oil to be treated is a low-concentration PCB-containing insulating oil, the unreacted metallic sodium contained in the dehalogenated oil is quenched, and solid impurities contained in the dehalogenated oil are extracted. Since the amount of water required is 1% by weight of the dehalogenated oil, the amount of water added is overwhelmingly small compared with the quenching method using conventional water.

  The halogen compound-containing oil detoxifying method of the present invention is the halogen compound-containing oil detoxifying method, wherein the oil to be treated further contains an oxidized denatured oil, and the solid impurities include the oxidized compound. It is also characterized in that a reaction product produced by the reaction of altered oil and metallic sodium is also included.

  According to the present invention, since the oil to be treated may contain oxidized and denatured oil, for example, the pole transformer after extracting the PCB trace amount insulating oil is crushed and heated by vacuum to be recovered. A PCB-mixed insulating oil that contains a distillate can also be used as the oil to be treated.

  The halogen compound-containing oil detoxification treatment method of the present invention is the halogen compound-containing oil detoxification treatment method, wherein the purification step further comprises dehydration in which water in the oil after the oil-water separation step is dehydrated with a dehydrating agent. Including a process.

  When reusing refined oil as insulating oil, it is necessary to sufficiently remove water in the oil. In the method for detoxifying a halogen-containing oil of the present invention, the amount of water to be added is very small, and further, the water is separated using a coalescer type oil-water separator, so that the water in the oil is sufficiently separated. However, further dehydration with a dehydrating agent ensures dehydration, and such refined oil can be reused as insulating oil.

  The present invention also includes a reaction vessel in which a halogen compound in the oil to be treated is dehalogenated with metallic sodium to obtain a dehalogenated oil, and the dehalogenated oil and a predetermined amount of water are mixed together. In the dehalogenated oil discharged from the impurity extraction tank, quenching the metal sodium of the reaction and dissolving the solid impurities contained in the dehalogenated oil in water and / or taking in the water A halogenated oil-water separator comprising a coalescer type oil-water separator for separating water.

  The detoxification treatment apparatus for halogen compound-containing oil according to the present invention has a simple structure and uses a small number of apparatuses and devices. For this reason, it is more compact than conventional detoxification processing equipment for halogen compound-containing oil that is quenched and refined using a large amount of water. Furthermore, it is possible to refine the dehalogenated oil efficiently and the energy consumption is small.

  The detoxification treatment method and detoxification treatment apparatus for a halogen compound-containing oil according to the present invention includes adding a small amount of water to a dehalogenated oil to quench unreacted metallic sodium contained in the dehalogenated oil, and dehalogenating oil. After dissolving solid impurities contained in water and / or taking in water, oil-water separation is performed using a coalescer type oil-water separator to obtain a refined oil, so that unreacted metallic sodium is quenched. The dehalogenated oil can be efficiently purified with less energy.

It is a figure which shows schematic structure of the PCB mixing insulation oil detoxification processing apparatus 1 which is 1st Embodiment of this invention. It is a flowchart which shows the process sequence of the PCB mixing insulation oil detoxification processing apparatus 1 of FIG. It is a figure which shows the result of having analyzed the insulating oil containing paper wood dry matter and the insulating oil which does not contain paper wood dry matter by Fourier-transform infrared spectroscopy FTIR. It is a figure which shows schematic structure of the PCB mixing insulation oil detoxification processing apparatus 2 which is 2nd Embodiment of this invention.

  FIG. 1 is a diagram showing a schematic configuration of a PCB-mixed insulating oil detoxification processing apparatus 1 according to a first embodiment of the present invention. FIG. 2 is a flowchart showing a processing procedure of the PCB-mixed insulating oil detoxification processing apparatus 1. Hereinafter, a mixture of the PCB trace mixed insulating oil extracted from the pole transformer and the distillate collected by crushing the column transformer after extracting the PCB trace insulating oil and vacuum heating it. Taking the case of using the oil to be treated as an example, the configuration and processing procedure of the PCB-mixed insulating oil detoxification processing apparatus 1 will be described. In the first and second embodiments of the present invention, the solid impurities are sodium hydroxide produced by the reaction of unreacted metallic sodium and water, and the reaction product produced by dechlorination of PCB. Sodium, sodium hydroxide, biphenyl, polybiphenyl, oxidized modified oil, metallic sodium, and a reaction product produced by reaction with a reaction accelerator.

  The PCB-mixed insulating oil detoxification treatment device 1 is a device that detoxifies PCB-mixed insulating oil by using an SP process (soduim pulverulent dispersion) method. The PCB is removed by reacting metallic sodium and PCB mixed in the insulating oil. Chlorine. Further, the treated oil obtained by dechlorinating PCB is refined to recover the refined oil.

  The PCB-mixed insulating oil detoxification treatment apparatus 1 includes a storage tank 11 for storing the oil to be treated, a vacuum distillation tank 13 for removing water contained in the oil to be treated, and a reaction tank 15 for reacting the PCB with metal sodium to dechlorinate. , Decomposition confirmation tank 17 for confirming dechlorination of PCB, Impurities for quenching unreacted metallic sodium contained in the treated oil with a small amount of water and extracting solid impurities contained in the treated oil An extraction tank 19 is provided with a coalescer type oil-water separator 21 that separates water from the treated oil and collects refined oil.

  The oil to be treated consists of the PCB trace mixed insulating oil extracted from the pole transformer, and the distillate recovered by crushing the column transformer after extracting the PCB trace mixed insulating oil and heating it in vacuum. These are stored in the storage tank 11 (accepting step: step S1) and then sent to the vacuum distillation tank 13. Note that the oil to be treated is not limited to this, and only the PCB trace-mixed insulating oil extracted from the pole transformer may be used as the oil to be treated, and the insulating oil containing a large amount of PCB may be referred to as the oil to be treated. can do.

  The vacuum distillation tank 13 is a jacketed stirring tank, and heats the oil to be treated by supplying a heated heat medium to the jacket. The vacuum distillation tank 13 includes a pressure reducing device (not shown) that depressurizes the inside of the tank and evaporates, condenses, and recovers water contained in the oil to be processed. The oil to be processed sent from the storage tank 11 is here. It is heated to about 90 ° C. and depressurized to about 0.0142 Mpa to remove water contained in the oil to be treated (dehydration step: step S2). The treated oil from which moisture has been removed in the vacuum distillation tank 13 is sent to the reaction tank 15.

  The reaction tank 15 is a jacketed stirring tank in which metal sodium is added to the oil to be treated from which water has been removed in the vacuum distillation tank 13. The metallic sodium is added to the reaction vessel 15 as a metallic sodium dispersion (SD: soduim dispersion) in which fine particles of metallic sodium are dispersed in insulating oil. As for the size of metallic sodium in SD, the average particle size is about 6 μm. Here, in order to sufficiently dechlorinate PCB and increase the decomposition rate (dechlorination rate), an amount of metal sodium exceeding the amount of metal sodium necessary for dechlorination of PCB is added. The oil to be treated and sodium metal are heated to about 90 ° C. by a heated heating medium supplied to the jacket while being stirred, and the PCB reacts with metal sodium to dechlorinate and the oil to be treated is rendered harmless (reaction Process: Step S3). A predetermined amount of water is added as a reaction accelerator after the metal sodium dispersion is added and a predetermined time elapses.

In the present embodiment, since the column transformer after the PCB trace mixed insulating oil is extracted from the oil to be treated is contained and the distillate collected by vacuum heating is collected, the C = O bond is contained in the oil to be treated. And oxidized modified oils containing C—O bonds. The reason why the oxidized modified oil containing C═O bond and C—O bond is included is that the pole transformer includes paper and wood, and these dry-distilled products are included in the recovered insulating oil. FIG. 3 is a diagram showing the results of analysis by Fourier transform infrared spectroscopy FTIR of insulating oil containing paper-wood dry matter and insulating oil not containing paper-wood dry matter. A peak of 1750 cm ^{−1 of} C═O appears strongly in the insulating oil containing the paper tree dry matter. Examples of the oxidized modified oil containing a C═O bond include carboxylic acid, ester, aldehyde, and ketone. Therefore, in this embodiment, in addition to the reaction between PCB and metallic sodium, oxidized and altered oil reacts with metallic sodium and further the reaction accelerator. Hereinafter, typical reactions in the reaction tank 15 will be shown.

  As can be seen from the above reaction formula, to-be-treated oil from which PCB has been dechlorinated (treated oil) includes reaction products such as sodium chloride, sodium hydroxide, biphenyl, polybiphenyl, and oxidized modified oil. The reaction product produced by the reaction of metallic sodium and further with the reaction accelerator is included. Furthermore, since sodium metal is excessively added to the reaction tank 15, unreacted metal sodium remains in the treated oil. The reaction product and unreacted sodium metal are solid and dispersed in the treated oil.

  Oil to be treated is a mixture of the PCB trace insulating oil extracted from the pole transformer and the pillar transformer after the PCB trace insulating oil is extracted and vacuum heated to recover the distillate recovered. If it shows an example of the magnitude | size of the solid-state impurity (containing unreacted metal sodium) contained in the processed oil sampled at the decomposition | disassembly confirmation tank 17 exit at the time of setting, it will be 2-11 micrometers in particle diameter, and 9 micrometers in average particle diameters. Yes, 95% or more can be separated by filtering with a filter medium having an opening of 1 μm, and 99% or more can be separated by filtering with a 0.1 μm filter medium. The concentration of solid impurities (including unreacted metallic sodium) in the treated oil is about 0.2% by weight, and the unreacted metallic sodium is about 10% of the solid impurities.

  The treated oil from which PCB has been dechlorinated in the reaction tank 15 is sent to the decomposition confirmation tank 17 and sampled through the sampling line 18 to confirm whether the PCB concentration in the treated oil is equal to or lower than a predetermined concentration. (Confirmation step: Step S4). Here, if it is confirmed that the PCB does not reach the predetermined concentration or less, the treated oil is returned to the reaction tank 15 and the PCB is dechlorinated again. The treated oil is sent to the impurity extraction tank 19 when it is confirmed that the PCB concentration is not more than a predetermined concentration (confirmation step: step S5). When oil is supplied from the decomposition confirmation tank 17 to the impurity extraction tank 19, a temperature adjustment operation such as cooling the treated oil is unnecessary.

  The impurity extraction tank 19 is a stirring tank provided with a stirrer, and here, a small amount of water is added to the treated oil, and the water and the treated oil are stirred and mixed, and unreacted metallic sodium in the treated oil and Quenching is performed by reacting with water and converting unreacted metallic sodium into sodium hydroxide. Further, solid impurities in the treated oil are dissolved in water and / or taken into water (impurity extraction step: step S6).

  The amount of water added here is capable of quenching unreacted metallic sodium in the treated oil, and the viscosity of the water in which the solid impurities are dissolved and / or the impurities are incorporated is the coalescer type oil-water separation. This is the minimum amount that can be processed by the machine 21. The addition of water quenches unreacted metallic sodium in the treated oil and extracts solid impurities and separates this water to add purified oil, so that It is necessary to quench the unreacted metallic sodium in the finished oil and add an amount capable of extracting solid impurities with water. However, even if an amount of water that can quench unreacted metallic sodium in the treated oil and extract solid impurities is added, if too little water is added, the solid impurities are dissolved and / or Or the viscosity of the water which took in the impurity becomes too high, and it becomes difficult to separate the water from the treated oil by the coalescer type oil-water separator 21. If the amount of water is increased, the viscosity of the water in which the solid impurities are dissolved and / or the impurities are taken in decreases, and it is easy to separate with the coalescer type oil-water separator 21, but the amount of processing increases and the amount is not good. It is an economy.

  From the above, the amount of water to be added is preferably such that the concentration of dissolved sodium hydroxide is about 20 to 30% by weight. If this level of water is added, unreacted metallic sodium in the treated oil can be completely quenched, solid impurities in the treated oil can be extracted, and the viscosity of the coalescer type oil-water separator The viscosity can be processed at 21. The amount of water above varies depending on the PCB concentration in the oil to be treated, but crushes the PCB trace insulating oil extracted from the pole transformer and the pole transformer after extracting the PCB trace insulating oil. And when this is heated in vacuum and the mixture with the distillate recovered is treated oil, the amount is about 1% by weight of the treated oil. As can be seen from this amount, the amount of water added is very small.

  A treated oil containing water in which water is added in the impurity extraction tank 19, unreacted metallic sodium in the treated oil is quenched, solid impurities are dissolved, and / or solid impurities are taken in. Then, the oil is sent to the coalescer type oil-water separator 21 via the oil feed pump 20, where water is separated (oil-water separation step: step S7).

  The coalescer type oil-water separator 21 is a device that separates water and oil by using a difference in specific gravity by making the minute water droplets dispersed in the treated oil by passing the treated oil through the filter 22 into large water droplets. A known coalescer type oil-water separator 21 can be used. Thereby, the refined oil which remove | eliminated the unreacted metallic sodium and solid impurity from processed oil can be obtained.

  The oil-water separation experiment result using the coalescer type oil-water separator 21 is shown. When the treated oil having a water concentration of 3070 ppm in the treated oil, a particle size of water droplets in the treated oil of 7 to 150 μm, and a peak particle size of water droplets of 50 to 60 μm is processed by the coalescer type oil-water separator 21, The water concentration in the treated oil was 180 ppm. The dielectric breakdown voltage of the obtained refined oil was 60 kV 2.5 mm or more, sufficiently satisfying the insulating oil standard.

  The water separated by the coalescer type oil-water separator 21 can be evaporated to dryness and the solid content can be recovered. However, unlike the conventional quenching method using a large amount of water, the amount of added water is very high. Since there are few, it does not become a big burden even if it treats it as a waste as it is. When the separated water is used as waste as it is, neutralization is not performed, so that the neutralizing agent does not become waste and the amount of waste does not increase as in the conventional quenching method using a large amount of water.

  As described above, the PCB-containing insulating oil detoxification treatment apparatus 1 quenches unreacted metallic sodium contained in the dehalogenated oil with a small amount of water, and dissolves solid impurities contained in the dehalogenated oil in water. And / or taken into water and separated into oil and water to obtain a refined oil, so that the dehalogenated oil can be efficiently purified with less energy. In addition, the device configuration is simple and the number of devices and devices used is small. For this reason, it is more compact than conventional detoxification processing equipment for halogen compound-containing oil that is quenched and refined using a large amount of water.

  FIG. 4 is a diagram showing a schematic configuration of the PCB-mixed insulating oil detoxification processing apparatus 2 according to the second embodiment of the present invention. The same components as those in the PCB-mixed insulating oil detoxification processing apparatus 1 of the first embodiment shown in FIG.

  Similarly to the PCB-mixed insulating oil detoxification treatment apparatus 1 of the first embodiment, the PCB-mixed insulating oil detoxification processing apparatus 2 quenches unreacted metallic sodium contained in the treated oil with a small amount of water and is in a solid state. After that, the treated oil is separated into oil and water using a coalescer type oil / water separator 21. In the PCB-mixed insulating oil detoxification treatment device 2, the coalescer type oil / water separator 21 performs oil / water separation. The difference is that the treated oil is filtered by the filtration device 23 in advance and the treated oil separated by the coalescer type oil-water separator 21 is dehydrated by the dehydrating device 25 to obtain purified oil.

  Similarly to the PCB-mixed insulating oil detoxification processing apparatus 1 of the first embodiment, the PCB-mixed insulating oil detoxification processing apparatus 2 adds only a small amount of water to the treated oil in the impurity extraction tank 19, so that the properties of the oil to be processed are In some cases, solid impurities having a large particle diameter that do not dissolve in water may remain. In the coalescer type oil-water separator 21, solid impurities dissolved in water and solid impurities transferred to the water side that can pass through the filter 22 are separated from the treated oil together with water. Solid impurities that cannot pass through the filter 22 are captured by the filter 22. For this reason, large solid impurities are not contained in the refined oil, but such impurities block the filter 22.

  In the PCB-mixed insulating oil detoxification treatment device 2, before the treated oil discharged from the impurity extraction tank 19 is applied to the coalescer-type oil / water separator 21, the filter 22 of the coalescer-type oil / water separator 21 is prevented from being blocked. For the purpose of preventing the decrease, solid impurities that cannot pass through the filter 22 of the coalescer type oil-water separator 21 are removed by the filtration device 23. The filtration device 23 only needs to be able to remove solid impurities that cannot pass through the filter 22 of the coalescer type oil-water separator 21, and a known strainer or the like can be used. In addition, if there are few solid impurities which cannot pass through the filter 22 of the coalescer type oil-water separator 21, and the solid impurities are captured by the filter 22 of the coalescer type oil-water separator 21, the filtration device 23 is particularly provided. There is no need.

  The dehydrating device 25 contains a dehydrating agent 26 and further removes a trace amount of water remaining in the treated oil after the water is separated by the coalescer type oil-water separator 21. The type of the dehydrating device 25 is not particularly limited, and as the dehydrating agent 26, a known dehydrating agent such as molecular sieve or silica gel can be used. If the dehydrating agent 26 is passed, the amount of water in the refined oil can be reduced to 100 ppm or less, so the refined oil can be reused as an insulating oil, and the use of the refined oil is expanded.

  In the above embodiment, the PCB-mixed insulating oil detoxification processing apparatuses 1 and 2 are shown, but the present invention quenches unreacted metallic sodium contained in the dehalogenated oil with a small amount of water and is contained in the dehalogenated oil. In addition to the PCB-mixed insulating oil, the oil containing halogen compounds can be made of metallic sodium. The present invention can be preferably used in a process for dehalogenation. In the above embodiment, the size of metallic sodium in SD and the size and amount of solid impurities in the treated oil are shown as numerical values, but this is an example, and the present invention is limited to these numerical values. It is not something.

DESCRIPTION OF SYMBOLS 1 PCB mixing insulating oil detoxification processing apparatus 2 PCB mixing insulating oil detoxification processing apparatus 11 Storage tank 13 Vacuum distillation tank 15 Reaction tank 17 Decomposition | disassembly confirmation tank 18 Sampling line 19 Impurity extraction tank 20 Oil feed pump 21 Coalescer type oil-water separator 22 Filter 23 Filtration device 25 Dehydration device 26 Dehydrating agent

Claims (6)

A reaction step of dehalogenating a halogen compound in the oil to be treated with metallic sodium to obtain a dehalogenated oil;
A predetermined amount of water is added to the dehalogenated oil to quench unreacted metallic sodium contained in the dehalogenated oil, and solid impurities contained in the dehalogenated oil are dissolved in water and / or An impurity extraction step for incorporating into water, a purification step for dehalogenated oil including an oil / water separation step for separating water from the dehalogenated oil using a coalescer-type oil / water separator following the impurity extraction step;
A method for detoxifying a halogen compound-containing oil, comprising:   The predetermined amount of water is a minimum amount of water that quenches unreacted metallic sodium and the viscosity of the water after extracting solid impurities is a viscosity that can be separated by the coalescer type oil-water separator. The method for detoxifying a halogen-containing oil according to claim 1, wherein   3. The detoxification treatment of a halogen-containing oil according to claim 1 or 2, wherein the oil to be treated is a low-concentration PCB-mixed insulating oil, and the water is added in an amount of 1% by weight with respect to the dehalogenated oil. Method.   The oil to be treated further includes an oxidized modified oil, and the solid impurities include a reaction product generated by a reaction between the oxidized modified oil and metallic sodium. The method for detoxifying a halogen-containing oil as described.   The said refinement | purification process further includes the dehydration process which spin-dry | dehydrates the water in the oil after the said oil-water separation process with a dehydrating agent, The detoxification of the halogen compound containing oil of any one of Claim 1 to 4 characterized by the above-mentioned. Processing method. A reaction tank for dehalogenating a halogen compound in oil to be treated with metallic sodium to obtain a dehalogenated oil;
The dehalogenated oil and a predetermined amount of water are mixed to quench unreacted metallic sodium contained in the dehalogenated oil, and solid impurities contained in the dehalogenated oil are dissolved in water and / or Or an impurity extraction tank to be taken into water,
A coalescer type oil-water separator for separating water in the dehalogenated oil discharged from the impurity extraction tank;
An apparatus for detoxifying a halogen compound-containing oil, comprising:

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