JP4521571B2 - Method for treating volatile organic halogen compounds - Google Patents
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この発明は、揮発性有機ハロゲン化合物の処理方法に関する。この方法は、特に揮発性非ハロゲン有機化合物中に数千ｐｐｍ以下という比較的低濃度で含まれる揮発性有機ハロゲン化合物を分解し、有機化合物を再利用するのに好適に利用されうる。 The present invention relates to a method for treating a volatile organic halogen compound. This method can be suitably used particularly for decomposing volatile organic halogen compounds contained in volatile non-halogen organic compounds at a relatively low concentration of several thousand ppm or less and reusing the organic compounds.
有機溶剤として汎用されているトルエンなどの揮発性有機化合物は、活性炭などを使用した吸着・脱離設備により回収され、一般に再利用される。回収されたこれらの有機化合物中には脱脂洗浄剤などとして用いられている塩化メチレン、トリクロロエチレンのような揮発性有機ハロゲン化合物がしばしば混入している。従って、これらのハロゲン化合物が有害であることから、再利用に際して除去する必要がある。
揮発性有機ハロゲン化合物の除去方法としては、従来種々提案されている。例えば、特許文献１には、ハロゲン化炭化水素類を微粒子光触媒とともにアルカリ性水溶液に懸濁させ、光照射して分解する方法が開示されている。特許文献２には、電解槽の陰極側にハロゲン化エチレンを導入し、水溶液を電気分解すると同時にハロゲン化エチレンを分解する方法が開示されている。特許文献３には、有機ハロゲン化合物をアルカリ性水溶液と混合し、反応装置に連続的に注入してマイクロ波を照射することにより、沸騰させないで有機ハロゲン化合物を分解する方法が開示されている。特許文献４には、揮発性有機塩素化合物に酸素存在下で紫外線を照射して当該化合物を親水化し、これをアルカリ性水溶液と接触させることにより、易分解性にする方法が開示されている。
Volatile organic compounds such as toluene, which are widely used as organic solvents, are collected by an adsorption / desorption facility using activated carbon and generally reused. These recovered organic compounds often contain volatile organic halogen compounds such as methylene chloride and trichloroethylene, which are used as a degreasing detergent. Therefore, since these halogen compounds are harmful, it is necessary to remove them upon reuse.
Various methods for removing volatile organic halogen compounds have been proposed. For example, Patent Document 1 discloses a method in which a halogenated hydrocarbon is suspended in an alkaline aqueous solution together with a fine particle photocatalyst and decomposed by light irradiation. Patent Document 2 discloses a method of introducing ethylene halide to the cathode side of an electrolytic cell to electrolyze an aqueous solution and simultaneously decompose ethylene halide. Patent Document 3 discloses a method of decomposing an organic halogen compound without boiling it by mixing the organic halogen compound with an alkaline aqueous solution, continuously injecting the mixture into a reaction apparatus, and irradiating with microwaves. Patent Document 4 discloses a method in which a volatile organic chlorine compound is irradiated with ultraviolet rays in the presence of oxygen to hydrophilize the compound and brought into contact with an alkaline aqueous solution to make it easily decomposable.
しかし、従来の除去方法は、いずれも水溶液中で分解反応させることを必須としている。このため、揮発性有機ハロゲン化合物を除去した後の残液を有機溶剤としてそのまま再利用することができない。かといって、水を分離し、精製するには多大の費用がかかる。
それ故、この発明の課題は、揮発性非ハロゲン有機化合物と揮発性有機ハロゲン化合物との混合溶液から揮発性有機ハロゲン化合物を短時間且つ低コストで除去する方法を提供することにある。
However, all conventional removal methods require that the decomposition reaction be performed in an aqueous solution. For this reason, the residual liquid after removing a volatile organic halogen compound cannot be reused as it is as an organic solvent. However, it is very expensive to separate and purify water.
Therefore, an object of the present invention is to provide a method for removing a volatile organic halogen compound from a mixed solution of a volatile non-halogen organic compound and a volatile organic halogen compound in a short time and at a low cost.
その課題を解決するために、この発明の処理方法は、
周期表の第１族及び／又は第２族元素の水酸化物及び／又は弱酸塩を担持した炭素系触媒の存在下、揮発性非ハロゲン有機化合物と揮発性有機ハロゲン化合物との混合溶液にマイクロ波を照射することを特徴とする。
この方法によれば、炭素系触媒がマイクロ波を吸収し熱エネルギーに変換するので、マイクロ波照射に伴って混合溶液の温度が上昇し、短時間で揮発性有機ハロゲン化合物と前記水酸化物又は弱酸塩とが反応可能な温度に達する。従って、揮発性有機ハロゲン化合物が炭素系触媒に吸着すると、先に吸着している前記水酸化物等と反応し、遊離したハロゲンが第１族又は第２族元素に捕捉されて金属塩となって無害化される。
In order to solve the problem, the processing method of the present invention is:
In the presence of a carbon-based catalyst carrying a hydroxide and / or weak acid salt of a group 1 and / or 2 element of the periodic table, a micro solution is added to a mixed solution of a volatile non-halogen organic compound and a volatile organic halogen compound. It is characterized by irradiating waves.
According to this method, since the carbon-based catalyst absorbs microwaves and converts them into thermal energy, the temperature of the mixed solution increases with microwave irradiation, and the volatile organic halogen compound and the hydroxide or A temperature is reached at which the weak acid salt can react. Therefore, when the volatile organic halogen compound is adsorbed on the carbon-based catalyst, it reacts with the previously adsorbed hydroxide and the like, and the liberated halogen is captured by the group 1 or group 2 element to form a metal salt. Be rendered harmless.
以上のように、揮発性有機ハロゲン化合物が非水系媒体中短時間で分解されるので、ハロゲンを捕捉した炭素系触媒をろ過、遠心分離などの適宜の方法で除去することにより、残液を低コストで再利用可能である。 As described above, since the volatile organic halogen compound is decomposed in a non-aqueous medium in a short time, the residual liquid can be reduced by removing the carbon-based catalyst capturing the halogen by an appropriate method such as filtration or centrifugation. Reusable at cost.
この発明は、前記混合溶液中の揮発性有機ハロゲン化合物の濃度が１０ｐｐｍ〜３０００ｐｐｍであるものに好適に利用される。１０ｐｐｍ未満の場合は、処理しなくても再利用可能であるし、３０００ｐｐｍを超える場合はハロゲン化合物がマイクロ波吸収性を有することから、炭素系触媒を用いない公知の方法で処理可能だからである。
前記炭素系触媒としては、揮発性有機ハロゲン化合物を選択的に吸着させるために５００ｍ２／ｇ以上のＢＥＴ表面積を有するものが好ましく、特に活性炭が好ましい。炭素系触媒には、炭素の他に炭素以外の導電性化合物、例えばフェライト、ＷＣ、ＳｉＣなどからなる補助触媒を含んでいてもよい。触媒のマイクロ波吸収性が向上するからである。
The present invention is suitably used for those in which the concentration of the volatile organic halogen compound in the mixed solution is 10 ppm to 3000 ppm. If it is less than 10 ppm, it can be reused without treatment, and if it exceeds 3000 ppm, the halogen compound has microwave absorbability, so that it can be treated by a known method without using a carbon-based catalyst. .
The carbon-based catalyst preferably has a BET surface area of 500 m 2 / g or more in order to selectively adsorb volatile organic halogen compounds, and activated carbon is particularly preferable. In addition to carbon, the carbon-based catalyst may include an auxiliary catalyst made of a conductive compound other than carbon, such as ferrite, WC, and SiC. This is because the microwave absorptivity of the catalyst is improved.
前記担持物質は、水酸化カリウム、水酸化ナトリウム、炭酸ルビジウム及び炭酸セシウムのうちから選ばれる一種以上が好ましい。これらの金属の水酸化物及び弱酸塩は、ハロゲン化合物と容易に反応して無害の塩を生じるからである。
前記水酸化物及び／又は弱酸塩の担持量は、好ましくは前記炭素系触媒との合計量に対して１〜５０重量％である。１重量％未満ではハロゲンの捕捉作用に乏しいし、５０重量％を超えると触媒の表面の大半を担持物質が占めてしまい、ハロゲン化合物の吸着が困難となるからである。
前記マイクロ波を照射する際は、反応系が１００℃以上２００℃以下となるように制御するのが好ましい。反応温度が高いほどハロゲン化合物を分解させやすいが、あまり高いと反応容器の耐圧性を高める必要があり、低コストを達成しがたくなるからである。好ましい温度は１２０℃以上１６０℃以下である。制御する手段としては、マイクロ波の電源をオン／オフする、マイクロ波の出力を変化させるなどが挙げられる。
The support material is preferably one or more selected from potassium hydroxide, sodium hydroxide, rubidium carbonate, and cesium carbonate. This is because these metal hydroxides and weak acid salts easily react with halogen compounds to form harmless salts.
The supported amount of the hydroxide and / or weak acid salt is preferably 1 to 50% by weight based on the total amount with the carbon-based catalyst. If the amount is less than 1% by weight, the action of trapping halogen is poor, and if it exceeds 50% by weight, the support material occupies most of the surface of the catalyst, making it difficult to adsorb the halogen compound.
When irradiating the microwave, it is preferable to control the reaction system to be 100 ° C. or higher and 200 ° C. or lower. This is because the higher the reaction temperature, the easier the halogen compound is decomposed, but if it is too high, it is necessary to increase the pressure resistance of the reaction vessel, making it difficult to achieve low cost. A preferable temperature is 120 ° C. or higher and 160 ° C. or lower. Examples of the control means include turning on / off the microwave power source and changing the microwave output.
−実施例１〜６−
（実施例１）
メチルナフタレンにトリクロルエチレンを加えて混合溶液を調製した。塩素含有量は、１，０１０ｐｐｍであった。別途、ＢＥＴ法による比表面積１３５０ｍ2／ｇの粉末椰子ガラ活性炭を水酸化カリウム水溶液に浸けて乾燥させることにより、活性炭に水酸化カリウムを１０重量％担持させた。前記混合溶液４．０ｇ、及び水酸化カリウムを担持した前記活性炭０．５ｇを耐圧性の反応管に入れ、周波数２．４５ＧＨｚ、最大出力３００Ｗのマグネトロンを備えたバイオタージ社製マイクロ波反応器にセットして、マイクロ波を１０分間照射した。照射中の最高温度及び最高ゲージ圧力は、それぞれ１５５℃及び２ｂａｒとなった。
-Examples 1-6
Example 1
Trichloroethylene was added to methylnaphthalene to prepare a mixed solution. The chlorine content was 1,010 ppm. Separately, 10 wt% of potassium hydroxide was supported on activated carbon by immersing and drying a powdered cocoon activated carbon having a specific surface area of 1350 m 2 / g by BET method in an aqueous potassium hydroxide solution. 4.0 g of the mixed solution and 0.5 g of the activated carbon loaded with potassium hydroxide are put in a pressure-resistant reaction tube, and a microwave reactor manufactured by Biotage Corporation equipped with a magnetron having a frequency of 2.45 GHz and a maximum output of 300 W is used. Set and irradiate with microwave for 10 minutes. The maximum temperature and maximum gauge pressure during irradiation were 155 ° C. and 2 bar, respectively.
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．２９２であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は０／４２０７であった。よって、トリクロルエチレンの分解率が１００％であることを確認した。
（実施例２〜６）
水酸化カリウムの担持量、及びマイクロ波の照射時間を種々変更した以外は、実施例１と同一条件で反応を行った。反応条件及び分解率を実施例１で記載した数値と併せて表１に示す。
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.292, whereas trichloroethylene after irradiation was The peak ratio of / xylene was 0/4207. Therefore, it was confirmed that the decomposition rate of trichloroethylene was 100%.
(Examples 2 to 6)
The reaction was performed under the same conditions as in Example 1 except that the amount of potassium hydroxide supported and the microwave irradiation time were variously changed. The reaction conditions and decomposition rates are shown in Table 1 together with the numerical values described in Example 1.
―実施例７〜９―
（実施例７）
メチルナフタレンにトリクロルエチレンを加えて混合溶液を調製した。塩素含有量は、１，０１０ｐｐｍであった。別途、ＢＥＴ法による比表面積１３５０ｍ2／ｇの粉末椰子ガラ活性炭に水酸化ナトリウムを１０重量％担持させた。前記混合溶液４．０ｇ、及び水酸化ナトリウムを担持した前記活性炭０．５ｇを耐圧性の反応管に入れ、実施例１と同じバイオタージ社製マイクロ波反応器にセットして、マイクロ波を５分間照射した。照射中の最高温度及び最高ゲージ圧力は、それぞれ１２５℃及び２ｂａｒとなった。
-Examples 7-9-
(Example 7)
Trichloroethylene was added to methylnaphthalene to prepare a mixed solution. The chlorine content was 1,010 ppm. Separately, 10% by weight of sodium hydroxide was supported on a powdered cocoon glass activated carbon having a specific surface area of 1350 m 2 / g by BET method. 4.0 g of the mixed solution and 0.5 g of the activated carbon carrying sodium hydroxide were placed in a pressure-resistant reaction tube, set in the same microwave reactor manufactured by Biotage as in Example 1, and the microwave was 5 Irradiated for 1 minute. The maximum temperature and the maximum gauge pressure during irradiation were 125 ° C. and 2 bar, respectively.
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．３２３であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は９６１／３９３９であった。すなわち、トリクロルエチレンの分解率は２４％であった。
（実施例８〜９）
水酸化ナトリウムの担持量、及びマイクロ波の照射時間を種々変更した以外は、実施例７と同一条件で反応を行った。反応条件及び分解率を実施例７で記載した数値と併せて表２に示す。
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.323, whereas trichloroethylene after irradiation was The peak ratio of / xylene was 961/3939. That is, the decomposition rate of trichloroethylene was 24%.
(Examples 8 to 9)
The reaction was performed under the same conditions as in Example 7 except that the amount of sodium hydroxide supported and the microwave irradiation time were variously changed. The reaction conditions and decomposition rates are shown in Table 2 together with the numerical values described in Example 7.
−実施例１０−
メチルナフタレンにトリクロルエチレンを加えて混合溶液を調製した。塩素含有量は、１，０６１ｐｐｍであった。別途、ＢＥＴ法による比表面積１３５０ｍ2／ｇの粉末椰子ガラ活性炭に水酸化マグネシウムを２５重量％担持させた。前記混合溶液４．０ｇ、及び水酸化マグネシウムを担持した前記活性炭０．５ｇを耐圧性の反応管に入れ、実施例１と同じバイオタージ社製マイクロ波反応器にセットして、マイクロ波を５分間照射した。照射中の最高温度は１００℃となり、圧力はほとんど上昇しなかった。
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．３２３であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は１０９８／４０１９であった。すなわち、トリクロルエチレンの分解率は１５％であった。
-Example 10-
Trichloroethylene was added to methylnaphthalene to prepare a mixed solution. The chlorine content was 1,061 ppm. Separately, 25 wt% of magnesium hydroxide was supported on a powdered cocoon glass activated carbon having a specific surface area of 1350 m 2 / g by BET method. 4.0 g of the mixed solution and 0.5 g of the activated carbon carrying magnesium hydroxide were placed in a pressure-resistant reaction tube and set in the same microwave reactor manufactured by Biotage as in Example 1, and the microwave Irradiated for 1 minute. The maximum temperature during irradiation was 100 ° C., and the pressure hardly increased.
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.323, whereas trichloroethylene after irradiation was The peak ratio of / xylene was 1098/4019. That is, the decomposition rate of trichloroethylene was 15%.
−実施例１１−
メチルナフタレンにトリクロルエチレンを加えて混合溶液を調製した。塩素含有量は、１，１１５．５ｐｐｍであった。別途、ＢＥＴ法による比表面積１３５０ｍ2／ｇの粉末椰子ガラ活性炭に水酸化カルシウムを１０．９重量％担持させた。前記混合溶液４．０ｇ、及び水酸化カルシウムを担持した前記活性炭０．５ｇを耐圧性の反応管に入れ、実施例１と同じバイオタージ社製マイクロ波反応器にセットして、マイクロ波を５分間照射した。照射中の最高温度は１４０℃となり、圧力はほとんど上昇しなかった。
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．２９１であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は４９６／２０６０であった。すなわち、トリクロルエチレンの分解率は１７％であった。
-Example 11-
Trichloroethylene was added to methylnaphthalene to prepare a mixed solution. The chlorine content was 1,115.5 ppm. Separately, 10.9% by weight of calcium hydroxide was supported on powdered eggplant activated carbon having a specific surface area of 1350 m 2 / g by the BET method. 4.0 g of the mixed solution and 0.5 g of the activated carbon carrying calcium hydroxide were placed in a pressure-resistant reaction tube and set in the same microwave reactor manufactured by Biotage as in Example 1, and the microwave Irradiated for 1 minute. The maximum temperature during irradiation was 140 ° C., and the pressure hardly increased.
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.291, whereas trichloroethylene after irradiation was 0.291. The peak ratio of / xylene was 496/2060. That is, the decomposition rate of trichloroethylene was 17%.
−実施例１２−
メチルナフタレンにトリクロルエチレンを加えて混合溶液を調製した。塩素含有量は、１，０６１ｐｐｍであった。別途、ＢＥＴ法による比表面積１３５０ｍ2／ｇの粉末椰子ガラ活性炭に炭酸カリウムを５０重量％担持させた。前記混合溶液４．０ｇ、及び炭酸カリウムを担持した前記活性炭０．５ｇを耐圧性の反応管に入れ、実施例１と同じバイオタージ社製マイクロ波反応器にセットして、マイクロ波を５分間照射した。照射中の最高温度は１２５℃となり、圧力はほとんど上昇しなかった。
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．３２３であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は１１８５／３９８７であった。すなわち、トリクロルエチレンの分解率は８％であった。
-Example 12-
Trichloroethylene was added to methylnaphthalene to prepare a mixed solution. The chlorine content was 1,061 ppm. Separately, 50% by weight of potassium carbonate was supported on powdered eggplant activated carbon having a specific surface area of 1350 m 2 / g by the BET method. 4.0 g of the mixed solution and 0.5 g of the activated carbon loaded with potassium carbonate are put in a pressure-resistant reaction tube and set in the same microwave reactor manufactured by Biotage as in Example 1, and the microwave is applied for 5 minutes. Irradiated. The maximum temperature during irradiation was 125 ° C., and the pressure hardly increased.
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.323, whereas trichloroethylene after irradiation was The peak ratio of / xylene was 1185/3987. That is, the decomposition rate of trichloroethylene was 8%.
−実施例１３−
メチルナフタレンにトリクロルエチレンを加えて混合溶液を調製した。塩素含有量は、１，１１５ｐｐｍであった。別途、ＢＥＴ法による比表面積１３５０ｍ2／ｇの粉末椰子ガラ活性炭に炭酸ルビジウムを１１．２重量％担持させた。前記混合溶液４．０ｇ、及び炭酸ルビジウムを担持した前記活性炭０．５ｇを耐圧性の反応管に入れ、実施例１と同じバイオタージ社製マイクロ波反応器にセットして、マイクロ波を５分間照射した。照射中の最高温度は１４０℃となり、圧力はほとんど上昇しなかった。
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．２９１であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は３２２／２２６１であった。すなわち、トリクロルエチレンの分解率は５１％であった。
-Example 13-
Trichloroethylene was added to methylnaphthalene to prepare a mixed solution. The chlorine content was 1,115 ppm. Separately, 11.2% by weight of rubidium carbonate was supported on a powdered cocoon activated carbon having a specific surface area of 1350 m 2 / g by the BET method. 4.0 g of the mixed solution and 0.5 g of the activated carbon carrying rubidium carbonate are placed in a pressure-resistant reaction tube and set in the same microwave reactor manufactured by Biotage as in Example 1, and the microwave is applied for 5 minutes. Irradiated. The maximum temperature during irradiation was 140 ° C., and the pressure hardly increased.
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.291, whereas trichloroethylene after irradiation was 0.291. The peak ratio of / xylene was 322/2261. That is, the decomposition rate of trichloroethylene was 51%.
−実施例１４−
メチルナフタレンにトリクロルエチレンを加えて混合溶液を調製した。塩素含有量は、１，１１５ｐｐｍであった。別途、ＢＥＴ法による比表面積１３５０ｍ2／ｇの粉末椰子ガラ活性炭に炭酸セシウムを１０．８重量％担持させた。前記混合溶液４．０ｇ、及び炭酸セシウムを担持した前記活性炭０．５ｇを耐圧性の反応管に入れ、実施例１と同じバイオタージ社製マイクロ波反応器にセットして、マイクロ波を５分間照射した。照射中の最高温度は１４０℃となり、圧力はほとんど上昇しなかった。
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．２９１であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は５５５／３８２５であった。すなわち、トリクロルエチレンの分解率は５０％であった。
-Example 14-
Trichloroethylene was added to methylnaphthalene to prepare a mixed solution. The chlorine content was 1,115 ppm. Separately, 10.8% by weight of cesium carbonate was supported on a powdered cocoon activated carbon having a specific surface area of 1350 m 2 / g by the BET method. 4.0 g of the mixed solution and 0.5 g of the activated carbon carrying cesium carbonate are placed in a pressure-resistant reaction tube and set in the same microwave reactor manufactured by Biotage as in Example 1, and microwaves are applied for 5 minutes. Irradiated. The maximum temperature during irradiation was 140 ° C., and the pressure hardly increased.
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.291, whereas trichloroethylene after irradiation was 0.291. The peak ratio of / xylene was 555/3825. That is, the decomposition rate of trichloroethylene was 50%.
−比較例１−
水酸化カリウムを活性炭に担持させていないこと以外は実施例１と同一条件でマイクロ波を１０分間照射した。照射中の最高温度及び最高ゲージ圧力は、それぞれ２５５℃及び１ｂａｒとなった。
反応終了後、p-キシレンを標準液として反応液をガスクロマトグラムにて分析したところ、マイクロ波照射前のトリクロルエチレン／キシレンのピーク比が０．２９２であったのに対し、照射後のトリクロルエチレン／キシレンのピーク比は０．２８２であった。すなわち、トリクロルエチレンの分解率は３．４％であった。
-Comparative Example 1-
Microwaves were irradiated for 10 minutes under the same conditions as in Example 1 except that potassium hydroxide was not supported on activated carbon. The maximum temperature and the maximum gauge pressure during irradiation were 255 ° C. and 1 bar, respectively.
After completion of the reaction, the reaction mixture was analyzed by gas chromatogram using p-xylene as a standard solution. The peak ratio of trichloroethylene / xylene before microwave irradiation was 0.292, whereas trichloroethylene after irradiation was The peak ratio of / xylene was 0.282. That is, the decomposition rate of trichloroethylene was 3.4%.
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