JP2987069B2 - Method of detoxifying polychlorinated biphenyl - Google Patents
Method of detoxifying polychlorinated biphenylInfo
- Publication number
- JP2987069B2 JP2987069B2 JP33720994A JP33720994A JP2987069B2 JP 2987069 B2 JP2987069 B2 JP 2987069B2 JP 33720994 A JP33720994 A JP 33720994A JP 33720994 A JP33720994 A JP 33720994A JP 2987069 B2 JP2987069 B2 JP 2987069B2
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- JP
- Japan
- Prior art keywords
- pcb
- sulfide
- dechlorination
- reaction
- alkaline earth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ポリ塩化ビフェニル
（以下、ＰＣＢと称する）の無害化処理方法に関する。
更に詳しくは、脱塩素化／硫化反応よるＰＣＢの無害化
処理方法に関する。The present invention relates to a method for detoxifying polychlorinated biphenyl (hereinafter referred to as PCB).
More specifically, the present invention relates to a method for detoxifying PCBs by a dechlorination / sulfurization reaction.
【０００２】[0002]
【従来の技術】ＰＣＢは耐熱性、耐薬品性、電気絶縁性
などに優れた、有機塩素化合物であり、トランスやコン
デンサの絶縁油、熱媒体、潤滑油、感圧紙のインキ原料
など多方面に使用されてきたが、人体に有害で、かつ自
然界での分解が困難な環境汚染物質であることが判明し
て以来、その生産・使用は中止された。2. Description of the Related Art PCB is an organic chlorine compound excellent in heat resistance, chemical resistance, electric insulation, etc., and is used in various fields such as insulating oil for transformers and capacitors, heat medium, lubricating oil, and ink material for pressure-sensitive paper. Production and use have been discontinued since it was found to be an environmental pollutant that has been used but is harmful to the human body and difficult to decompose in nature.
【０００３】しかし、既に生産されたＰＣＢの処理が問
題になっており、その無害化処理方法は種々検討されい
る。焼却による無害化方法、還元雰囲気での熱分解によ
る無害化方法、プラズマ分解による無害化方法、アルカ
リ金属・アルコラートなどとの脱塩素化反応による無害
化方法、紫外線・放射線などの照射によって脱塩素化・
酸化することによる無害化方法、超臨界水処理による無
害化方法、微生物分解による無害化方法などの開発が進
められている。[0003] However, treatment of PCBs already produced has become a problem, and various detoxification methods have been studied. Detoxification method by incineration, detoxification method by thermal decomposition in reducing atmosphere, detoxification method by plasma decomposition, detoxification method by dechlorination reaction with alkali metals, alcoholates, etc., dechlorination by irradiation with ultraviolet rays and radiation・
Development of a detoxification method by oxidization, a detoxification method by supercritical water treatment, a detoxification method by microbial decomposition, and the like are being advanced.
【０００４】これらの方法のうちで、焼却法はこれまで
最も研究され、大量処理も可能なことからＰＣＢの無害
化処理方法の中心と考えられているが、焼却時の副反応
によって、ポリ塩化ジベンゾフラン、ポリ塩化ジベンゾ
ダイオキシンなどの毒性物質が生成することが明らかに
なった。その他の無害化処理方法は、実験室的開発段階
であったり、或いはその処理に膨大な費用を要する方法
であったりして、いずれも実用性に乏しい。[0004] Among these methods, the incineration method has been most studied so far, and is considered to be the main method of detoxifying PCBs because it can be processed in large quantities. It was revealed that toxic substances such as dibenzofuran and polychlorinated dibenzodioxin were formed. Other detoxification treatment methods are not practical because they are in the laboratory development stage or require a huge amount of treatment.
【０００５】[0005]
【発明が解決しようとする課題】このような事情によ
り、大部分のＰＣＢは未処理のまま各地に貯蔵されてい
る実情にある。安全かつ確実な無害化処理方法の確立が
望まれている。本発明者等は、毒性物質の副生を伴わ
ず、安全かつ経済性も兼ね備えた、ＰＣＢの無害化処理
方法の確立を課題とした。Under such circumstances, most PCBs are stored in various places without being processed. It is desired to establish a safe and reliable detoxification method. An object of the present inventors is to establish a method for detoxifying PCBs, which is safe and economical without involving toxic substances as a by-product.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、ＰＣＢが
有機アミド系又は尿素系溶媒中でアルカリ金属又はアル
カリ土類金属の硫化物と容易に脱塩素化／硫化反応する
こと、しかも塩素置換基数が多いＰＣＢほど容易に反応
することなどに着目し、鋭意検討した結果本発明に到っ
た。即ち本発明は、有機アミド系又は尿素系溶媒中で、
ＰＣＢとアルカリ金属又はアルカリ土類金属の硫化物と
を接触させ、脱塩素化／硫化反応を行うことを特徴とす
るＰＣＢの無害化処理方法である。本発明方法による脱
塩素化／硫化反応によってＰＣＢは無害化され、通常の
焼却処理に供しても環境汚染のおそれがない。以下、本
発明について詳述する。The present inventors have found that PCB readily undergoes a dechlorination / sulfurization reaction with an alkali metal or alkaline earth metal sulfide in an organic amide or urea solvent. Focusing on the fact that a PCB having a larger number of substituents reacts more easily, the present inventors have assiduously studied and arrived at the present invention. That is, the present invention, in an organic amide-based or urea-based solvent,
This is a method for detoxifying PCBs, which comprises bringing PCBs into contact with a sulfide of an alkali metal or an alkaline earth metal and performing a dechlorination / sulfide reaction. The PCB is rendered harmless by the dechlorination / sulfurization reaction according to the method of the present invention, and there is no risk of environmental pollution even when subjected to ordinary incineration treatment. Hereinafter, the present invention will be described in detail.
【０００７】〔硫化物及び水硫化物〕本発明の方法で使
用できる硫化物は、アルカリ金属又はアルカリ土類金属
の硫化物又は水硫化物であって、例示すると、硫化リチ
ウム、硫化ナトリウム、硫化カリウム、硫化ルビジウ
ム、硫化セシウム、硫化カルシウム、硫化ストロンチウ
ムなどを挙げることができる。これらは無水物、水和
物、及び水溶液として用いることができる。更には、反
応系中に硫化水素又はアルカリ金属又はアルカリ土類金
属の水硫化物とアルカリ金属又はアルカリ土類金属の水
酸化物を別々に添加したりして、その場で（in situ)、
アルカリ金属又はアルカリ土類金属の硫化物を生成させ
て用いてもよい。これらの硫化物（以下、水硫化物をも
含む）のうちでは、硫化ナトリウム、硫化カルシウムが
安価であり、経済的に好ましい。[Sulfide and Hydrosulfide] The sulfide which can be used in the method of the present invention is an alkali metal or alkaline earth metal sulfide or hydrosulfide, and examples thereof include lithium sulfide, sodium sulfide and sulfide. Potassium, rubidium sulfide, cesium sulfide, calcium sulfide, strontium sulfide, and the like can be given. These can be used as anhydrides, hydrates, and aqueous solutions. Further, hydrogen sulfide or alkali metal or alkaline earth metal hydrosulfide and alkali metal or alkaline earth metal hydroxide are separately added to the reaction system, and in situ (in situ)
A sulfide of an alkali metal or an alkaline earth metal may be generated and used. Among these sulfides (hereinafter also including hydrosulfide), sodium sulfide and calcium sulfide are inexpensive and economically preferable.
【０００８】〔溶媒〕本発明の方法では、有機アミド系
溶媒、尿素系溶媒を用いる。例示すると、ホルムアミ
ド、アセトアミド、Ｎ，Ｎ−ジメチルフォルムアミド、
Ｎ，Ｎ−ジメチルアセトアミド、２−ピロリドン、Ｎ−
メチル−２−ピロリドン、ε−カプロラクタム、Ｎ−メ
チルカプロラクタム等、及びテトラメチル尿素、１，３
−ジメチル−２−イミダゾリジノン等を挙げることがで
きる。[Solvent] In the method of the present invention, an organic amide solvent and a urea solvent are used. For example, formamide, acetamido, N, N-dimethylformamide,
N, N-dimethylacetamide, 2-pyrrolidone, N-
Methyl-2-pyrrolidone, ε-caprolactam, N-methylcaprolactam and the like, and tetramethylurea, 1,3
-Dimethyl-2-imidazolidinone and the like.
【０００９】〔無害化反応〕脱塩素化／硫化反応反応
は、有機アミド系又は尿素系溶媒中で、ＰＣＢとアルカ
リ金属又はアルカリ土類金属の硫化物を接触させ、脱塩
素化／硫化反応が起こる反応条件に設定することによっ
て行う。溶媒の使用量に関しては特に制限は無い。反応
系の加熱・除熱のし易さ、撹拌のし易さ、経済性等を勘
案して決定すればよい。通常は、ＰＣＢの濃度が１〜９
０重量％になるように条件設定する。好ましくは５〜７
０重量％、より好ましくは１０〜５０重量％である。[Detoxification reaction] In the dechlorination / sulfurization reaction, PCB is brought into contact with a sulfide of an alkali metal or an alkaline earth metal in an organic amide-based or urea-based solvent. This is done by setting the reaction conditions to occur. There is no particular limitation on the amount of solvent used. The temperature may be determined in consideration of the ease of heating and heat removal of the reaction system, the ease of stirring, and the economic efficiency. Usually, the concentration of PCB is 1-9.
Conditions are set so as to be 0% by weight. Preferably 5-7
0% by weight, more preferably 10 to 50% by weight.
【００１０】ＰＣＢ対するアルカリ金属又はアルカリ土
類金属の硫化物の使用割合は、ジクロロビフェニル換算
ＰＣＢ１モル当たり、０．３〜１０モルである。ここ
で、ＰＣＢのジクロロビフェニル換算モルとは、ジクロ
ロビフェニル１モルを換算モルでも１モルとし、塩素置
換基数が１個又は３個以上のＰＣＢは、ジクロロビフェ
ニルを基準にして換算する。換算のし方を具体例で説明
すると、モノクロロビフェニル１モルはジクロロビフェ
ニル換算モルでは０．５モルに相当し、トリクロロビフ
ェニル１モルは１．５モル、テトラクロロビフェニル１
モルは２モルに相当する、などである。アルカリ金属ま
たはアルカリ土類金属の硫化物の使用割合が、ジクロロ
ビフェニル換算したＰＣＢ１モル当たり、好ましくは
１．５〜１０モル、更に好ましくは２．０〜１０モルで
あれば、ＰＣＢは塩素置換基のほとんどが脱塩素化／硫
化され、脱塩素化／硫化反応後のＰＣＢを液状とするこ
とがきる。ＰＣＢが脱塩素化／硫化処理によって液状と
なることにより、焼却等のその他の後処理時の取扱いが
容易になる。また、ＰＣＢ分子中のほとんどの塩素が置
換されていることにより、さらに焼却処理するとき、焼
却中に塩化水素などの腐食性ガス、及びポリ塩化ジベン
ゾフラン、ポリ塩化ジベンゾダイオキシンなどの毒性物
質の発生が無く、環境汚染のおそれがない。The use ratio of the sulfide of the alkali metal or alkaline earth metal to the PCB is from 0.3 to 10 mol per mol of PCB in terms of dichlorobiphenyl. Here, the dichlorobiphenyl-equivalent mole of PCB is one mole of dichlorobiphenyl even when converted to one mole, and PCB having one or three or more chlorine substituents is converted based on dichlorobiphenyl. To explain the conversion method using specific examples, 1 mol of monochlorobiphenyl is equivalent to 0.5 mol in terms of mol of dichlorobiphenyl, 1 mol of trichlorobiphenyl is 1.5 mol, and 1 mol of tetrachlorobiphenyl is 1 mol.
A mole corresponds to 2 moles, and so on. If the use ratio of the sulfide of the alkali metal or the alkaline earth metal is preferably 1.5 to 10 mol, more preferably 2.0 to 10 mol per mol of PCB in terms of dichlorobiphenyl, PCB is a chlorine substituent. Is dechlorinated / sulfurized, and the PCB after the dechlorination / sulfurization reaction can be made liquid. By making the PCB liquid by the dechlorination / sulfurization treatment, handling during other post-treatment such as incineration becomes easy. Also, since most of the chlorine in the PCB molecule has been replaced, during further incineration, corrosive gases such as hydrogen chloride and toxic substances such as polychlorinated dibenzofuran and polychlorinated dibenzodioxin are generated during incineration. no rather, there is no risk of environmental pollution.
【００１１】脱塩素化／硫化反応は、５０〜３００℃の
温度範囲で行われる。更に、８０〜２８０℃が好ましい
範囲である。反応系に多量の水が存在するときには、脱
塩素化／硫化反応を著しく阻害する場合がある。この場
合には脱塩素化／硫化反応に先だって、或いは反応進行
中に溶媒との共沸蒸留によって過剰の水を除去すればよ
い。本発明の脱塩素化／硫化反応は反応容器でバッチ式
に行っても、反応管中を流動させながら連続的に行って
もよい。更に、脱塩素化／硫化反応に際して、反応系中
にアルカリ金属又はアルカリ土類金属の酸化物又は水酸
化物を共存させ、反応系を安定化させることができ、Ｐ
ＣＢの脱塩素化／硫化反応が効果的に行われる。このこ
とは、ＰＣＢに対する硫化物の使用割合が１モル／ジク
ロロビフェニル換算ＰＣＢモル以下のように少ないとき
は特に好ましい。[0011] The dechlorination / sulfidation reaction is carried out in a temperature range of 50 to 300 ° C. Further, 80 to 280C is a preferable range. When a large amount of water is present in the reaction system, the dechlorination / sulfurization reaction may be significantly inhibited. In this case, prior to the dechlorination / sulfurization reaction, or during the progress of the reaction, excess water may be removed by azeotropic distillation with a solvent. The dechlorination / sulfurization reaction of the present invention may be carried out batchwise in a reaction vessel or continuously while flowing in a reaction tube. Further, in the dechlorination / sulfurization reaction, an alkali metal or alkaline earth metal oxide or hydroxide is allowed to coexist in the reaction system to stabilize the reaction system.
The dechlorination / sulfurization reaction of CB is effectively performed. This is particularly preferable when the use ratio of sulfide to PCB is as small as 1 mol / mole of PCB or less in terms of dichlorobiphenyl.
【００１２】脱塩素化／硫化反応終了後、反応溶媒は蒸
留等の操作によって回収され、再使用することができ
る。無害化処理されたＰＣＢは、通常、蒸留残渣中に残
る。これを焼却する場合には、ロータリー・キルン等の
焼却炉に供給し、焼却すればよい。焼却の際、毒性の強
いポリハロジベンゾフラン、ポリハロジベンゾダイオキ
シン等を副生しないことは、本発明の方法の優れた点で
ある。更に、塩化水素等の有害ガスを発生しないので、
炉の内壁の耐火レンガや配管等に損害を与える恐れがな
い。蒸留残渣中にアルカリ金属又はアルカリ土類金属の
ハロゲン化物と共に未反応の硫化物が存在していても、
焼却によって、硫酸塩になり無害化される。尚、焼却に
よって亜硫酸ガスが発生しても、技術的に確立している
脱硫装置によって容易に除去できる。After the completion of the dechlorination / sulfurization reaction, the reaction solvent is recovered by an operation such as distillation and can be reused. The detoxified PCB usually remains in the distillation residue. When incinerated, it may be supplied to an incinerator such as a rotary kiln and incinerated. It is an excellent point of the method of the present invention that no highly toxic polyhalodibenzofuran, polyhalodibenzodioxin and the like are produced as by-products during incineration. Furthermore, because it does not generate harmful gases such as hydrogen chloride,
There is no risk of damaging the refractory bricks and piping on the inner wall of the furnace. Even if unreacted sulfide is present together with the alkali metal or alkaline earth metal halide in the distillation residue,
By incineration, it turns into sulfate and is rendered harmless. Even if sulfur dioxide gas is generated by incineration, it can be easily removed by a technically established desulfurization device.
【００１３】以下に、実施例、比較例を示し、本発明を
具体的に説明する。本発明はこれらに限定されるもので
はない。Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. The present invention is not limited to these.
【００１４】[0014]
【実施例１】ＰＣＢ絶縁油の無害化処理（１） （１）実験に用いたＰＣＢ絶縁油の組成分析 ＪＩＳ Ｋ００９３に準拠し、検出器として電子捕獲形
検出器（ＥＣＤ）を用いたガスクロマトグラフ法により
分析した。ＰＣＢ絶縁油試料のガスクロマトグラムはポ
リ塩化ビフェニル標準液 ＫＣ−５００ のそれとほぼ一
致した。定量用標準物質としてＫＣ−５００を用いて算
出すると、試料中のＰＣＢ含有量は７０．５重量％、Ｐ
ＣＢだけの組成比は以下の如くであった。Example 1 Detoxification Treatment of PCB Insulating Oil (1) (1) Composition Analysis of PCB Insulating Oil Used in Experiments A gas chromatograph using an electron capture detector (ECD) as a detector according to JIS K0093. Was analyzed by the method. The gas chromatogram of the PCB insulating oil sample almost coincided with that of the polychlorinated biphenyl standard solution KC-500. When calculated using KC-500 as a standard substance for quantification, the PCB content in the sample was 70.5% by weight,
The composition ratio of CB alone was as follows.
【００１５】 ＰＣＢ 組成比（重量％） ───────────────────── ２塩化物 ０．２８ ３塩化物 ３．１６ ４塩化物 ２１．４３ ５塩化物 ４６．４３ ６塩化物 ２１．６３ ７塩化物 ７．０５PCB composition ratio (% by weight) ─────────────────────2 chloride 0.28 3 chloride 3.164 4 chloride 21.435 Chloride 46.436 Chloride 21.63 7 Chloride 7.05
【００１６】（２）ＰＣＢ絶縁油の無害化処理 １リットルのオートクレーブに、２４８ｇの硫化ナトリ
ウム・５水塩（Ｎａ2Ｓ純度４６．２％）、Ｎ−メチル
−２−ピロリドン（ＮＭＰ）７００ｇを仕込み、１８０
℃まで昇温しながら約１００ｇの少量の硫化水素を含む
水／ＮＭＰ混合溶液を留出させた。次いで、約８０℃ま
で冷却した後、上記のＰＣＢ絶縁油１５０．０ｇを加
え、窒素雰囲気下、３時間かけて２５５℃まで昇温し、
更にこの温度に１時間保って、脱塩化／硫化反応を行っ
た後、室温まで冷却した。反応液は褐色であり、ポリマ
ー状の固形物は認められなかった。反応液につき、上記
のガスクロマトグラフ法で残留ＰＣＢ濃度を定量したと
ころ、３３．０ｍｇ／ｋｇであった。各塩化物濃度は下
記の如くであった。(2) Detoxification treatment of PCB insulating oil In a 1-liter autoclave, 248 g of sodium sulfide pentahydrate (Na 2 S purity: 46.2%) and 700 g of N-methyl-2-pyrrolidone (NMP) were added. Preparation, 180
While raising the temperature to 0 ° C, a water / NMP mixed solution containing a small amount of about 100 g of hydrogen sulfide was distilled off. Next, after cooling to about 80 ° C., 150.0 g of the above PCB insulating oil was added, and the temperature was raised to 255 ° C. over 3 hours in a nitrogen atmosphere.
The temperature was further maintained at this temperature for 1 hour to carry out a dechlorination / sulfurization reaction, followed by cooling to room temperature. The reaction solution was brown, and no solid polymer was observed. The concentration of residual PCB in the reaction solution was determined by the above gas chromatography method to be 33.0 mg / kg. Each chloride concentration was as follows.
【００１７】 ＰＣＢ 濃度（ｍｇ／ｋｇ） ───────────────────── ２塩化物 １４．７ ３塩化物 ２．８ ４塩化物 ７．２ ５塩化物 ８．１ ６塩化物 ０．２ 尚、これは９９．９重量％以上のＰＣＢが反応したこと
を意味している。PCB concentration (mg / kg) ─────────────────────2 chloride 14.7 3 chloride 2.8 4 chloride 7.25 Chloride 8.16 Chloride 0.2 This means that 99.9% by weight or more of PCB was reacted.
【００１８】[0018]
【実施例２】ＰＣＢ絶縁油の無害化処理（２） １リットルのオートクレーブに、２４８ｇの硫化ナトリ
ウム・５水塩（Ｎａ2Ｓ純度４６．２％）、Ｎ−メチル
−２−ピロリドン（ＮＭＰ）７００ｇ及び水酸化カルシ
ウム３．０ｇを仕込み、１９５℃まで昇温しながら約２
００ｇの少量の硫化水素を含む水／ＮＭＰ混合溶液を留
出させた。約８０℃まで冷却した後、上記のＰＣＢ絶縁
油１５０．０ｇを加え、窒素雰囲気下、約３時間かけて
２５０℃まで昇温し、更にこの温度に約１．５時間保っ
て、脱塩化／硫化反応を行った後、室温まで冷却した。
反応液は赤褐色であり、実施例１よりも反応系が安定化
したことが認められた。尚、反応液中にポリマー状の固
形物は認められなかった。反応液につき、上記のガスク
ロマトグラフ法で残留ＰＣＢを定量したところ、１９．
０ｍｇ／ｋｇであった。これは９９．９重量％以上のＰ
ＣＢが反応したことを意味している。なお、上記反応液
より溶媒を回収し、残渣を焼却処理したところダイオキ
シンなどを検出できなかった。Example 2 Detoxification treatment of PCB insulating oil (2) In a 1-liter autoclave, 248 g of sodium sulfide pentahydrate (Na 2 S purity: 46.2%), N-methyl-2-pyrrolidone (NMP) 700 g and 3.0 g of calcium hydroxide were charged, and the temperature was raised to 195 ° C. for about 2 hours.
A water / NMP mixed solution containing a small amount of 00 g of hydrogen sulfide was distilled off. After cooling to about 80 ° C., 150.0 g of the above-mentioned PCB insulating oil was added, and the temperature was raised to 250 ° C. over about 3 hours in a nitrogen atmosphere. After performing the sulfurization reaction, it was cooled to room temperature.
The reaction solution was reddish brown, and it was confirmed that the reaction system was more stable than in Example 1. No polymer-like solid was observed in the reaction solution. When the residual PCB of the reaction solution was quantified by the above-described gas chromatography method, 19.
It was 0 mg / kg. This is 99.9% by weight or more of P
It means that CB has reacted. When the solvent was recovered from the above reaction solution and the residue was incinerated, dioxin and the like could not be detected.
【００１９】[0019]
【発明の効果】本発明の方法によれば、脱塩素化／硫化
反応により、ＰＣＢを無害化することができる。本発明
の方法により無害化処理されたＰＣＢは液状であり、容
易に焼却処理できる。焼却の際、腐食性の塩化水素ガ
ス、毒性の強いポリハロジベンゾフラン、ポリハロジベ
ンゾダイオキシン等を副生しない。According to the method of the present invention, PCBs can be rendered harmless by a dechlorination / sulfurization reaction. The PCB detoxified by the method of the present invention is in a liquid state and can be easily incinerated. During incineration, corrosive hydrogen chloride gas, highly toxic polyhalodibenzofuran, polyhalodibenzodioxin, etc. are not produced as by-products.
フロントページの続き (56)参考文献 特開 平７−241475（ＪＰ，Ａ) 特開 平４−26632（ＪＰ，Ａ) 特開 平７−8572（ＪＰ，Ａ) 特表 平４−504378（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) A62D 3/00 C07B 35/06 C07B 45/00 B09B 3/00 Continuation of the front page (56) References JP-A-7-241475 (JP, A) JP-A-4-26632 (JP, A) JP-A-7-8572 (JP, A) , A) (58) Fields investigated (Int. Cl. 6 , DB name) A62D 3/00 C07B 35/06 C07B 45/00 B09B 3/00
Claims (3)
塩化ビフェニルとアルカリ金属又はアルカリ土類金属の
硫化物若しくは水硫化物とを接触させ、脱塩素化／硫化
反応を行うことを特徴とするポリ塩化ビフェニルの無害
化処理方法。1. A dechlorination / sulfurization reaction by contacting polychlorinated biphenyl with a sulfide or hydrosulfide of an alkali metal or alkaline earth metal in an organic amide or urea solvent. Of detoxifying polychlorinated biphenyls.
塩化ビフェニルとアルカリ金属又はアルカリ土類金属の
硫化物若しくは水硫化物とを接触させ、脱塩素化／硫化
反応を行った後、焼却処理することを特徴とするポリ塩
化ビフェニルの無害化処理方法。2. A dechlorination / sulfurization reaction is carried out by contacting polychlorinated biphenyl with a sulfide or hydrosulfide of an alkali metal or alkaline earth metal in an organic amide or urea solvent, followed by incineration. A method for detoxifying polychlorinated biphenyl, which comprises treating.
金属又はアルカリ土類金属の水酸化物または酸化物を共
存させる、請求項１または２に記載のポリ塩化ビフェニ
ルの無害化処理方法。3. The method for detoxifying polychlorinated biphenyl according to claim 1, wherein a hydroxide or oxide of an alkali metal or an alkaline earth metal coexists in the dechlorination / sulfurization reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33720994A JP2987069B2 (en) | 1994-12-26 | 1994-12-26 | Method of detoxifying polychlorinated biphenyl |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33720994A JP2987069B2 (en) | 1994-12-26 | 1994-12-26 | Method of detoxifying polychlorinated biphenyl |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08173572A JPH08173572A (en) | 1996-07-09 |
| JP2987069B2 true JP2987069B2 (en) | 1999-12-06 |
Family
ID=18306468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33720994A Expired - Fee Related JP2987069B2 (en) | 1994-12-26 | 1994-12-26 | Method of detoxifying polychlorinated biphenyl |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2987069B2 (en) |
-
1994
- 1994-12-26 JP JP33720994A patent/JP2987069B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08173572A (en) | 1996-07-09 |
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