JP5069838B2 - Method for producing activated carbon for deodorizer and activated carbon for deodorizer - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、脱臭剤用活性炭の製造方法および脱臭剤用活性炭に関し、詳しくは、硫黄を含む臭気物質の浄化を行うことができる臭素化合物が添着された脱臭剤用活性炭の製造方法および脱臭剤用活性炭に関する。
【０００２】
【従来の技術】
近年の環境問題への関心の高まりにともない、廃棄物の処理は、負荷を低減した後に環境へ排出することでなされている。このような処理を行う施設（装置）のひとつとして、下水処理場がある。
【０００３】
下水処理場には、廃水の処理を行うだけでなく、廃水自身および廃水の処理時に生じる悪臭の浄化が求められている。そして、一般的には、悪臭の浄化は、多孔質体に臭気物質を吸着させることで行われている。
【０００４】
そして、多孔質体には、活性炭に薬剤を添着した脱臭剤用活性炭が広く用いられている。薬剤が添着すると、臭気物質は添着した薬剤と化学的に反応して脱臭剤用活性炭に吸着されるようになる。すなわち、臭気物質の吸着性能は、薬剤の添着により大幅に向上する。そして、活性炭に吸着される薬剤を変更することで、脱臭剤用活性炭が吸着する臭気物質を選択することができる。
【０００５】
たとえば、臭素化合物を添着することで、脱臭剤用活性炭は硫化メチルや二硫化メチルといった硫黄を含む臭気物質を吸着浄化する。
【０００６】
活性炭への臭素化合物の添着は、臭素化合物の水溶液を調製し、活性炭にこの水溶液を浸漬させる方法や、臭素ガス（Ｂｒ2）を活性炭に吸着させる方法により行われていた。（特許文献１参照。）
しかしながら、臭素化合物を添着した活性炭においては、添着した臭素化合物に対する吸着性能が十分に得られているとは言えなかった。さらに、臭素ガスを吸着させる方法においては、臭素ガスは、毒性が強いため取り扱いに多大なコストが要求されていた。
【０００７】
【特許文献１】
特開平２００１−１２９３９２号公報
【０００８】
【発明が解決しようとする課題】
本発明は上記実状に鑑みてなされたものであり、臭気物質の吸着性能にすぐれた臭素化合物を添着した脱臭剤用活性炭の製造方法および脱臭剤用活性炭を提供することを課題とする。
【０００９】
【課題を解決するための手段】
上記課題を解決するために本発明者は、活性炭の吸着性能の低下が臭素化合物が活性炭と反応を生じることにより生じることを発見し、活性炭を酸化剤で処理した後に臭素化合物を添着させる製造方法とすることで上記課題を解決できることを見出した。
【００１０】
すなわち、本発明の脱臭剤用活性炭の製造方法は、活性炭を酸溶液で洗浄する酸化工程と、酸化工程が施された活性炭を水洗する水洗工程と、水洗工程が施された活性炭を乾燥させる乾燥工程と、乾燥工程が施された活性炭を臭化水素を含有する臭化水素水溶液に浸漬する添着工程と、を有することを特徴とする。
【００１１】
また、本発明の脱臭剤用活性炭は、上述の製造方法を用いて製造された脱臭剤用活性炭であり、活性炭を酸溶液で洗浄する酸化工程と、酸化工程が施された活性炭を水洗する水洗工程と、水洗工程が施された活性炭を乾燥させる乾燥工程と、乾燥工程が施された活性炭を臭化水素を含有する臭化水素水溶液に浸漬する添着工程と、を施してなることを特徴とする。
【００１２】
本発明の脱臭剤用活性炭の製造方法により製造された脱臭剤用活性炭は、硫黄を含む臭気物質に対する吸着性能が高くなっている。
【００１３】
【発明の実施の形態】
（脱臭剤用活性炭の製造方法）
本発明の脱臭剤用活性炭の製造方法は、活性炭を酸溶液で洗浄する酸化工程と、酸化工程が施された活性炭を水洗する水洗工程と、水洗工程が施された活性炭を乾燥させる乾燥工程と、乾燥工程が施された活性炭を臭化水素を含有する臭化水素水溶液に浸漬する添着工程と、を有する。
【００１４】
すなわち、本発明の脱臭剤用活性炭の製造方法は、臭素化合物を添着させる前に酸溶液で活性炭の処理を、行っている。酸溶液で活性炭の処理を行うことで、活性炭が添着した臭素化合物と反応しなくなり、十分な吸着性能が得られなくなっていた。
【００１５】
さらに詳しくは、活性炭に添着した臭素化合物は、Ｂｒ中間体による酸化反応により硫黄を含む臭気物質を分解浄化している。この分解浄化を行うＢｒ中間体は非常に不安定である。従来の活性炭の表面に臭素化合物が直接添着している活性炭においては、Ｂｒ中間体が活性炭と反応（還元反応）を生じることで臭気物質を十分に分解できなくなっていた。
【００１６】
本発明の製造方法は、臭素化合物を添着させる前に酸溶液で処理（洗浄）をしていることから、活性炭の還元性が低下した状態で臭素化合物を添着させている。すなわち、本発明により製造された脱臭剤用活性炭は、活性炭の還元性が低下することにより、Ｂｒ中間体が活性炭により分解されなくなっている。この結果、本発明により製造された脱臭剤用活性炭は、高い浄化性能を発揮する。さらに、本発明により製造された脱臭剤用活性炭は、添着した臭素化合物の分解が抑えられていることから、長期間にわたって高い浄化性能を発揮できる。
【００１７】
酸化工程は、活性炭の還元性を酸溶液により低下させる工程であり、活性炭の還元性を、担持後の活性炭におけるヨウ素吸着量が９２０ｍｌ／ｇ以下となるように、ヨウ素吸着量が１０３０ｍｌ／ｇ以下となるまで低下できる処理であれば、その処理方法は、特に限定されない。また、酸化剤も溶くに限定されるものではなく、硝酸、硫酸、塩酸等の酸を用いることができる。
【００１８】
酸化工程は、活性炭を酸溶液で洗浄する工程であることが好ましい。なお、酸溶液とは、酸水溶液等の酸の溶解した溶解液を含む溶液を示す。また、洗浄とは、活性炭の表面に酸溶液を接触させる処理を示す。活性炭を酸溶液で洗浄することで活性炭の還元性を低下させることができる。そして、酸化剤が溶液であることから、活性炭の表面の全面に酸化剤が接触できる。すなわち、活性炭の還元性をムラなく低下させることができる。さらに、酸溶液は、取り扱いが容易であるため、処理コストの上昇を抑えることができる。
【００１９】
本発明の脱臭剤用活性炭の製造方法は、酸化工程が施された活性炭を水洗する水洗工程と、水洗工程が施された活性炭を乾燥させる乾燥工程と、を有する。乾燥工程は、水洗した活性炭を水分が５％以下になるまで乾燥させる乾燥工程であることが好ましい。水洗工程で水洗した後に乾燥工程において水分が５％以下になるまで乾燥させることで、その後の添着工程における臭素化合物の添着をムラを生じさせることなく行うことが可能となる。
水洗工程は、排水のｐＨ６．０以上となるまで水洗する工程であることが好ましい。
【００２０】
酸溶液は、硝酸水溶液であることが好ましい。酸溶液として硝酸水溶液を用いることで、活性炭の還元性を低下させることができる。硝酸水溶液の濃度は、特に限定されるものではないが、濃度が過剰に高くなると溶液の取り扱いが困難になる。硝酸水溶液の濃度は、０．３Ｎであることが好ましい。
【００２１】
添着工程は、活性炭に臭素化合物を添着させる工程であり、活性炭に臭素化合物を添着させることができる処理であれば、その処理方法は、特に限定されない。すなわち、従来公知の手段により添着を行うことができる。臭素化合物の水溶液を調製し、この水溶液中に活性炭を浸漬する工程であることが好ましい。
本発明の脱臭剤用活性炭の製造方法において添着工程は、乾燥工程が施された活性炭を臭化水素を含有する臭化水素水溶液に浸漬する工程である。
本発明の脱臭剤用活性炭の製造方法において臭素化合物は、臭化水素である。添着工程は、活性炭のｐHが２．３以下となるまで活性炭に臭化水素を添着させる工程であることが好ましい。
【００２２】
臭素化合物は、活性炭１００重量部に対して臭素換算で１〜３０重量部で添着されることが好ましい。１重量部未満では添着の効果が得られず、３０重量部を超えると臭素化合物が活性炭に添着しにくくなる。
【００２３】
また、臭素化合物も従来公知の化合物を用いることができる。たとえば、臭化水素、臭化カリウムをあげることができる。
【００２４】
本発明の製造方法において、活性炭は、通常の脱臭剤用活性炭の製造に用いられる活性炭を用いることができる。活性炭は、ＢＥＴ比表面積が５０〜２０００ｍ2／ｇであることが好ましい。また、活性炭の原料は、限定されるものではなく、ヤシ、石炭など従来公知の材質からの活性炭を用いることができる。
【００２５】
活性炭は、ヨウ素吸着量が小さいことが好ましい。活性炭のヨウ素吸着量は細孔径／比表面積によって異なるが、同じ活性炭であっても表面状態が変化すれば吸着量も変化する。本発明の製造方法においては、ヨウ素の吸着量を小さくすることで、所望の性能の活性炭を製造できる。好ましくは、ヨウ素吸着量は１０３０ｍｇ／ｇ以下である。
【００２６】
本発明の脱臭剤用活性炭の製造方法は、臭素化合物を添着させる前に酸化剤で処理をしていることから、活性炭の還元性が低下した状態で臭素化合物を添着させている。すなわち、本発明により製造された脱臭剤用活性炭は、活性炭の還元性が低下することにより、Ｂｒ中間体が活性炭により分解されなくなっている。この結果、本発明により製造された脱臭剤用活性炭は、高い浄化性能を発揮する。
【００２７】
（脱臭剤用活性炭）
本発明の脱臭剤用活性炭は、活性炭を酸溶液で洗浄する酸化工程と、酸化工程が施された活性炭を水洗する水洗工程と、水洗工程が施された活性炭を乾燥させる乾燥工程と、乾燥工程が施された活性炭を臭化水素を含有する臭化水素水溶液に浸漬する添着工程と、を施してなる。すなわち、本発明の脱臭剤用活性炭は、上述の製造方法により製造された脱臭剤用活性炭である。
【００２８】
本発明の脱臭剤用活性炭は、臭素化合物を添着させる前に酸溶液で、行っている。酸溶液で処理をしていることから、活性炭の還元性が低下した状態で臭素化合物を添着している。すなわち、本発明の脱臭剤用活性炭は、活性炭の還元性が低下することにより、Ｂｒ中間体が活性炭により分解されなくなっている。この結果、本発明の脱臭剤用活性炭は、長期間にわたって高い浄化性能を発揮する。
【００２９】
酸化工程は、活性炭の還元性を、酸溶液より低下させる工程であり、活性炭の還元性を低下できる処理であれば、その処理方法は、特に限定されない。また、酸溶液も特に限定されるものではなく、硝酸、硫酸、塩酸等の酸を用いることができる。
【００３０】
酸化工程は、活性炭を酸溶液で洗浄する工程であることが好ましい。なお、酸溶液とは、酸水溶液等の酸の溶解した溶解液を含む溶液を示す。また、洗浄とは、活性炭の表面に酸溶液を接触させる処理を示す。活性炭を酸溶液で洗浄することで活性炭の還元性を低下させることができる。そして、酸化剤が溶液であることから、活性炭の表面の全面に酸化剤が接触できる。すなわち、活性炭の還元性をムラなく低下させることができる。さらに、酸溶液は、取り扱いが容易であるため、処理コストの上昇を抑えることができる。
【００３１】
本発明の脱臭剤用活性炭は、酸化工程が施された活性炭を水洗する水洗工程と、水洗工程が施された活性炭を乾燥させる乾燥工程と、を有する。水洗工程で水洗した後に乾燥工程において乾燥させることで、その後の添着工程における臭素化合物の添着をムラを生じさせることなく行うことが可能となる。
【００３２】
酸溶液は、硝酸水溶液であることが好ましい。酸溶液として硝酸水溶液を用いることで、活性炭の還元性を低下させることができる。硝酸水溶液の濃度は、特に限定されるものではないが、濃度が過剰に高くなると溶液の取り扱いが困難になる。硝酸水溶液の濃度は、０．３Ｎであることが好ましい。
【００３３】
添着工程は、活性炭に臭素化合物を添着させる工程であり、活性炭に臭素化合物を添着させることができる処理であれば、その処理方法は、特に限定されない。すなわち、従来公知の手段により添着を行うことができる。臭素化合物の水溶液を調製し、この水溶液中に活性炭を浸漬する工程であることが好ましい。また、臭素化合物も従来公知の化合物を用いることができる。たとえば、臭化水素、臭化カリウムをあげることができる。
本発明の脱臭剤用活性炭において添着工程は、乾燥工程が施された活性炭を臭化水素を含有する臭化水素水溶液に浸漬する工程である。
本発明の脱臭剤用活性炭において臭素化合物は、臭化水素である。添着工程は、活性炭のｐHが２．３以下となるまで活性炭に臭化水素を添着させる工程であることが好ましい。
【００３４】
活性炭は、通常の脱臭剤用活性炭の製造に用いられる活性炭を用いることができる。活性炭は、ＢＥＴ比表面積が５０〜２０００ｍ2／ｇであることが好ましい。また、活性炭の原料は、限定されるものではなく、ヤシ、石炭など従来公知の材質からの活性炭を用いることができる。
【００３５】
活性炭は、担持後の活性炭におけるヨウ素吸着量が９２０ｍｇ／ｇ以下となるように、ヨウ素吸着量が１０３０ｍｇ／ｇ以下である。そして、活性炭は、ヨウ素吸着量が小さいことが好ましい。
【００３６】
本発明の吸着剤用活性炭は、ｐＨが低いほど好ましい。ｐＨが低いほど活性炭上で、添着した臭素化合物のＢｒ中間体が発生しやすいためである。吸着剤用活性炭のｐＨは２．５以下であることが好ましく、ｐＨが２．３以下であることがより好ましい。
本発明の吸着剤用活性炭は、臭素化合物は、臭化水素であり、添着工程は、活性炭のｐHが２．３以下となるように活性炭に臭化水素を添着させる工程であることが好ましい。
本発明の吸着剤用活性炭は、添着工程後の活性炭のｐＨが２．３以下であることが好ましい。
【００３７】
なお、吸着剤用活性炭のｐＨは、活性炭を試料を３±０．１ｇで秤量し、１００ｍｌビーカーに投入し、さらに、純水１００ｍｌを加え、電熱器上で加熱した。このビーカーを攪拌することなしに５分間沸騰させた後に冷却した。室温にまで冷却したら、純水を加えて１００ｍｌとし、よく攪拌した後に水溶液のｐＨを測定し、この値を活性炭のｐＨとした。
【００３８】
本発明の脱臭剤用活性炭は、臭素化合物を添着させる前に酸化剤で処理をしていることから、活性炭の還元性が低下した状態で臭素化合物を添着している。すなわち、本発明の脱臭剤用活性炭は、活性炭の還元性が低下することにより、Ｂｒ中間体が活性炭により分解されなくなっている。この結果、本発明の脱臭剤用活性炭は、高い浄化性能を発揮する。
【００３９】
【実施例】
以下、実施例を用いて本発明を説明する。
【００４０】
本発明の実施例として、脱臭剤用活性炭を製造した。なお、以下の実施例において脱臭剤用活性炭となる活性炭は、φ４ｍｍ、ＢＥＴ比表面積が１１００ｍ２／ｇ、ヨウ素吸着量が１０５０ｍｇ／ｇの石炭系のペレット状の活性炭が用いられた。
【００４１】
（実施例１）
まず、０．３Ｎの硝酸水溶液を調製した。
【００４２】
つづいて、硝酸水溶液１２００ｍｌ中に８００ｇの活性炭を浸漬した。硝酸水溶液中への活性炭の浸漬は、活性炭を水溶液に投入した後に完全に浸漬するまで十分に攪拌を行った後に、１時間保持した。
【００４３】
保持後、濾過を行い活性炭を取りだした。取り出された活性炭は、排水のｐＨが６．０以上となるまで水洗した。その後、乾燥炉をにより、水分が５％以下になるまで８０℃で乾燥させた。
【００４４】
ここで、乾燥後の活性炭の水分量、充填密度、ベンゼン吸着量、ヨウ素吸着量およびｐＨを測定した。測定結果を表１に示した。
【００４５】
水分量の測定は、試料約１０ｇを重量既知の平形秤量瓶に量り取り、秤量瓶中で試料が均等な厚さとなるように拡げた後に栓をし、１０ｍｇ単位まで正確に重量を秤量した。つづいて、栓を取り、秤量瓶および栓を乾燥機中に投入し、１１５±５℃で３時間乾燥させた。乾燥後、デシケーター内で冷却し、栓をした後に重量を測定した。乾燥の前後における重量の変化量を水分量とした。
【００４６】
充填密度の測定は、試料を充填密度測定装置に入れ、１００〜１３３秒かけて１００ｍｌの試料をメスシリンダーに量りとった。試料の入ったメスシリンダーおよび試料の入っていないメスシリンダーの重量を０．１ｇ単位まで測定した。両重量から試料の重量を測定し、充填密度を算出した。
【００４７】
ベンゼン吸着量の測定は、あらかじめ１ｍｇ単位まで重量を測定した吸着試験用Ｕ字管に、試料約１０ｇを投入し、全体の重量を測定する。２５℃±０．５℃に調整したベンゼン吸着試験装置にＵ字管をセットし、乾燥したベンゼンの飽和蒸気もしくは１／１０に希釈したベンゼンガスを通気させ、容器の重量変化が５ｍｇ以内になるまで継続する。このときの重量増加から吸着量を算出する。
【００４８】
ヨウ素吸着量の測定は、粉砕した試料０．５ｇを量り取り、１００ｍｌの褐色共栓付き三角フラスコに投入し、さらに、０．０５ｍｌ／ｌのヨウ素溶液５０ｍｌを投入した。振とう機を用いて室温で１５分間振とうした後に、５０ｍｌの沈殿管に移し入れ、遠心分離器で沈殿させる。分離後の上澄み液１０ｍｌを分取し、０．１ｍｏｌ／ｌチオ硫酸ナトリウム溶液で滴定し、溶液の（ヨウ素の）黄色が薄くなったら、指示薬である１ｗｔ％でんぷん溶液を１ｍｌ加え、青色が消えるまで滴定を続け、滴定量から吸着量を算出した。
【００４９】
ｐＨの測定は、試料を３±０．１ｇで秤量し、１００ｍｌビーカーに投入し、さらに、純水１００ｍｌを加え、電熱器上で加熱した。このビーカーを攪拌することなしに５分間沸騰させた後に冷却した。室温にまで冷却したら、純水を加えて１００ｍｌとし、よく攪拌した後に水溶液のｐＨを測定し、この値を活性炭のｐＨとした。
【００５０】
【表１】
活性炭１００重量部に対して、Ｂｒ換算で３０重量部の臭化水素（ＨＢｒ）を含有する臭素水溶液を調製した。
【００５２】
そして、この臭素水溶液に活性炭を浸漬して、吸水担持させ、乾燥させた。
【００５３】
以上により、実施例１の脱臭剤用活性炭が製造された。
【００５４】
製造された脱臭剤用活性炭の水分量、充填密度、ベンゼン吸着量、ヨウ素吸着量およびｐＨを測定し、測定結果を表２に示した。
【００５５】
【表２】
（実施例２）
硝酸のかわりに硫酸を用いた以外は実施例１と同様に脱臭剤用活性炭の製造を行った。
【００５７】
なお、酸洗浄後の活性炭及び製造された脱臭剤用活性炭の水分量、充填密度、ベンゼン吸着量、ヨウ素吸着量およびｐＨを測定し、測定結果を表１および２にあわせて示した。
【００５８】
（実施例３）
硝酸のかわりに塩酸を用いた以外は実施例１と同様に脱臭剤用活性炭の製造を行った。
【００５９】
なお、酸洗浄後の活性炭及び製造された脱臭剤用活性炭の水分量、充填密度、ベンゼン吸着量、ヨウ素吸着量およびｐＨを測定し、測定結果を表１および２にあわせて示した。
【００６０】
（実施例４）
硝酸水溶液の硝酸濃度を変化させて所定のヨウ素吸着量となるようにした以外は、実施例１と同様に脱臭剤用活性炭の製造を行った。
【００６１】
なお、本実施例において製造された脱臭剤用活性炭は、ヨウ素吸着量が９９０ｍｇ／ｇであった。
【００６２】
（実施例５）
硝酸水溶液の硝酸濃度を変化させて所定のヨウ素吸着量となるようにした以外は、実施例１と同様に脱臭剤用活性炭の製造を行った。
【００６３】
なお、本実施例において製造された脱臭剤用活性炭は、ヨウ素吸着量が１０２０ｍｇ／ｇであった。
【００６６】
（比較例１）
酸洗浄を行わない以外は、実施例１と同様に脱臭剤用活性炭の製造を行った。
【００６７】
ＨＢｒ添着前の活性炭および製造された脱臭剤用活性炭の水分量、充填密度、ベンゼン吸着量、ヨウ素吸着量およびｐＨを測定し、測定結果を表１および２にあわせて示した。
【００６８】
（比較例２）
酸洗浄に変えて窒素処理を施した以外は、実施例１と同様に脱臭剤用活性炭の製造を行った。
【００６９】
本比較例において活性炭に施された窒素処理を以下に示す。
【００７０】
加熱雰囲気を調節可能な雰囲気炉内に活性炭を投入し、炉内に５Ｌ／ｍｉｎの流量でＮ2ガスを導入し続けた。この状態で、５℃／ｍｉｎの昇温速度で８００℃まで昇温し、８００℃で１時間保持した。保持後、Ｎ2ガス雰囲気下で放冷した。
【００７１】
ＨＢｒ添着前の活性炭および製造された脱臭剤用活性炭の水分量、充填密度、ベンゼン吸着量、ヨウ素吸着量およびｐＨを測定し、測定結果を表１および２にあわせて示した。
（比較例３）
硝酸水溶液の硝酸濃度を変化させて所定のヨウ素吸着量となるようにした以外は、実施例１と同様に脱臭剤用活性炭の製造を行った。
なお、本比較例において製造された脱臭剤用活性炭は、ヨウ素吸着量が１０４０ｍｇ／ｇであった。
【００７２】
（評価）
実施例及び比較例の脱臭剤用活性炭の評価として、硫化メチルの浄化を行い浄化率を測定した。
【００７３】
硫化メチルの浄化は、脱臭剤用活性炭を内部に保持したカラム内に硫化メチルを含有した試験ガスを流通させ、カラムを通過した試験ガス中の硫化メチル濃度を測定して浄化率を得た。
【００７４】
具体的には、まず、実施例あるいは比較例の脱臭剤用活性炭を円筒形のカラム内に６ｍｌ充填させた。このカラム内で脱臭剤用活性炭は、φ３０ｍｍ、軸方向の長さ８５ｍｍの空間を占めている。
【００７５】
そして、硫化メチルを含有させた試験ガスを空間速度３３３３３ｈｒ-1、線速度１１．８ｃｍ／ｓｅｃの流速でカラム内に流した。試験ガスは、空気に硫化メチルを１０ｐｐｍの割合となるように含有させたガスであり、カラム内へは、２５℃、湿度６０％の状態で供給された。
【００７６】
カラムを通過した試験ガス中の硫化メチルの含有量を測定し、カラム通過前の含有量から脱臭剤用活性炭の硫化メチルの浄化率を求めた。浄化率の測定結果を図１および図２に示した。なお、硫化メチル量の測定は、ガスクロマトグラフ質量分析計（島津製作所製、ＧＣ−８ＡＰ）を用いて行われた。なお、分析条件は、カラム；β，β’−ＯＤＰＮ２５％Ｃｈｒｏｍｏｓｏｒｂ ６０〜８０メッシュ、φ３．０ｍｍ、長さ３０００ｍｍ、温度；注入口／検出器：１５０℃、カラム：７０℃で行われた。
【００７７】
図１より、ＨＢｒの添着前に活性炭の酸洗浄を行った実施例１〜３の脱臭剤用活性炭は、比較例よりも高い浄化率を持っていることがわかる。また、各実施例の脱臭剤用活性炭は、時間が経過しても浄化率がほぼ維持されている。これに対して、比較例の脱臭剤用活性炭は、浄化時間がすすむにつれて浄化率が低下していき、１２０分後の浄化率は、浄化試験開始時より大幅に低下している。
【００７８】
すなわち、各実施例の脱臭剤用活性炭は、硫化メチルに対する高い浄化率を長時間維持できている。
【００７９】
また、図２より、実施例１および実施例４〜５の脱臭剤用活性炭は、いずれも比較例１及び３よりも高い浄化率を持っていることがわかる。さらに、各実施例においては、ヨウ素吸着量が小さいほど浄化率が高くなっていることがわかる。
【００８０】
【発明の効果】
本発明の脱臭剤用活性炭の製造方法は、臭素化合物を添着させる前に酸化剤で処理をしていることから、活性炭の還元性が低下した状態で臭素化合物を添着させている。すなわち、本発明により製造された脱臭剤用活性炭は、活性炭の還元性が低下することにより、Ｂｒ中間体が活性炭により分解されなくなっている。この結果、本発明により製造された脱臭剤用活性炭は、浄化性能の低下が抑えられ、高い浄化性能を発揮する。さらに、本発明により製造された脱臭剤用活性炭は、臭気物質の除去を長時間行っても、十分に高い浄化性能が維持される効果を示す。
【図面の簡単な説明】
【図１】実施例１〜３および比較例の脱臭剤用活性炭の硫化メチルの浄化率を測定した結果を示した図である。
【図２】実施例１，４〜５の脱臭剤用活性炭の硫化メチルの浄化率を測定した結果を示した図である。[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for producing activated carbon for deodorizer and activated carbon for deodorizer, and more specifically, a method for producing activated carbon for deodorant that is attached with a bromine compound capable of purifying odorous substances containing sulfur and for deodorizer. Regarding activated carbon.
[0002]
[Prior art]
With the recent increase in interest in environmental problems, waste treatment is performed by reducing the load and discharging it to the environment. One facility (apparatus) that performs such treatment is a sewage treatment plant.
[0003]
Sewage treatment plants are required not only to treat wastewater, but also to purify the bad odor generated during the treatment of the wastewater itself and the wastewater. In general, malodors are purified by adsorbing odorous substances to the porous body.
[0004]
And as the porous body, activated carbon for deodorizer obtained by adding a chemical to activated carbon is widely used. When the drug is attached, the odorous substance chemically reacts with the attached drug and is adsorbed on the deodorant activated carbon. That is, the adsorption performance of odorous substances is greatly improved by the addition of chemicals. And the odor substance which the activated carbon for deodorizers adsorb | sucks can be selected by changing the chemical | medical agent adsorb | sucked by activated carbon.
[0005]
For example, by adding a bromine compound, activated carbon for a deodorizing agent adsorbs and purifies odorous substances containing sulfur such as methyl sulfide and methyl disulfide.
[0006]
The attachment of the bromine compound to the activated carbon has been performed by preparing an aqueous solution of the bromine compound and immersing the aqueous solution in the activated carbon, or by adsorbing bromine gas (Br 2 ) to the activated carbon. (See Patent Document 1.)
However, the activated carbon impregnated with a bromine compound cannot be said to have sufficient adsorption performance for the adsorbed bromine compound. Furthermore, in the method for adsorbing bromine gas, bromine gas is highly toxic and therefore requires a great deal of cost for handling.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-129392
[Problems to be solved by the invention]
This invention is made | formed in view of the said actual condition, and makes it a subject to provide the manufacturing method of the activated carbon for deodorizers and the activated carbon for deodorizers which impregnated the bromine compound excellent in the adsorption | suction performance of an odorous substance.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventor has discovered that the decrease in the adsorption performance of activated carbon is caused by the reaction of the bromine compound with activated carbon, and the method of manufacturing the activated carbon is treated with an oxidizing agent and then the bromine compound is attached. It has been found that the above problem can be solved.
[0010]
That is, the method for producing activated carbon for a deodorizer according to the present invention includes an oxidation step for washing activated carbon with an acid solution, a water washing step for washing activated carbon subjected to the oxidation step, and drying for drying the activated carbon subjected to the water washing step. And an attaching step of immersing the activated carbon subjected to the drying step in a hydrogen bromide aqueous solution containing hydrogen bromide .
[0011]
Further, the activated carbon for deodorizer of the present invention is activated carbon for deodorizer manufactured using the above-described manufacturing method, and an oxidization process for cleaning the activated carbon with an acid solution and a water wash for rinsing the activated carbon subjected to the oxidation process. And a drying step of drying the activated carbon that has been subjected to the water washing step , and an attaching step of immersing the activated carbon that has been subjected to the drying step in a hydrogen bromide aqueous solution containing hydrogen bromide. To do.
[0012]
The activated carbon for deodorizer manufactured by the method for manufacturing activated carbon for deodorizer of the present invention has high adsorption performance for odorous substances containing sulfur.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
(Method for producing activated carbon for deodorizer)
The method for producing activated carbon for deodorizer of the present invention includes an oxidation step for washing activated carbon with an acid solution, a water washing step for washing activated carbon subjected to the oxidation step, and a drying step for drying activated carbon subjected to the water washing step, And an attaching step of immersing the activated carbon subjected to the drying step in a hydrogen bromide aqueous solution containing hydrogen bromide .
[0014]
That is, the manufacturing method of deodorizing agent for the activated carbon of the present invention, the process of the activated carbon with an acid solution prior to impregnating the bromine compound is carried out. When the activated carbon was treated with the acid solution , it did not react with the bromine compound with which the activated carbon was attached, and sufficient adsorption performance could not be obtained.
[0015]
More specifically, the bromine compound attached to the activated carbon decomposes and purifies odorous substances containing sulfur by an oxidation reaction with a Br intermediate. The Br intermediate that performs this decomposition and purification is very unstable. In the activated carbon in which the bromine compound is directly attached to the surface of the conventional activated carbon, the odorous substance cannot be sufficiently decomposed because the Br intermediate reacts with the activated carbon (reduction reaction).
[0016]
In the production method of the present invention, since the treatment (washing) is performed with an acid solution before the bromine compound is attached, the bromine compound is attached in a state where the reducing property of the activated carbon is lowered. That is, in the deodorant activated carbon produced according to the present invention, the Br intermediate is not decomposed by the activated carbon due to the reduced reducibility of the activated carbon. As a result, the activated carbon for a deodorant produced according to the present invention exhibits high purification performance. Furthermore, the activated carbon for a deodorant produced according to the present invention can exhibit high purification performance over a long period of time since decomposition of the adhering bromine compound is suppressed.
[0017]
The oxidation step is a step of reducing the reducibility of the activated carbon with an acid solution. The amount of iodine adsorbed is 1030 ml / g or less so that the amount of iodine adsorbed on the activated carbon after loading is 920 ml / g or less. The processing method is not particularly limited as long as the processing can be reduced to Further, the oxidizing agent is not limited to be dissolved, and an acid such as nitric acid, sulfuric acid, hydrochloric acid or the like can be used.
[0018]
The oxidation step is preferably a step of washing activated carbon with an acid solution. The acid solution refers to a solution containing an acid-dissolved solution such as an acid aqueous solution. Moreover, washing | cleaning shows the process which makes an acid solution contact the surface of activated carbon. The reducibility of the activated carbon can be reduced by washing the activated carbon with an acid solution. And since an oxidizing agent is a solution, an oxidizing agent can contact the whole surface of activated carbon. That is, the reducibility of activated carbon can be reduced evenly. Furthermore, since the acid solution is easy to handle, an increase in processing cost can be suppressed.
[0019]
The manufacturing method of the activated carbon for deodorizers of this invention has the water washing process which wash | cleans the activated carbon in which the oxidation process was performed, and the drying process which dries the activated carbon in which the water washing process was performed. The drying step is preferably a drying step in which the activated carbon washed with water is dried until the water content becomes 5% or less. By rinsing in the water washing step and then drying until the water content becomes 5% or less in the drying step, the bromine compound can be attached in the subsequent attaching step without causing unevenness.
The water washing step is preferably a step of washing with water until the pH of the wastewater becomes 6.0 or higher.
[0020]
The acid solution is preferably an aqueous nitric acid solution. By using an aqueous nitric acid solution as the acid solution, the reducing ability of the activated carbon can be reduced. The concentration of the aqueous nitric acid solution is not particularly limited, but handling of the solution becomes difficult if the concentration becomes excessively high. The concentration of the aqueous nitric acid solution is preferably 0.3N.
[0021]
The attachment step is a step of attaching a bromine compound to activated carbon, and the treatment method is not particularly limited as long as it is a treatment capable of attaching the bromine compound to activated carbon. That is, the attachment can be performed by a conventionally known means. A step of preparing an aqueous solution of a bromine compound and immersing activated carbon in this aqueous solution is preferred.
In the method for producing activated carbon for deodorizer of the present invention, the attaching step is a step of immersing the activated carbon that has been subjected to the drying step in a hydrogen bromide aqueous solution containing hydrogen bromide.
In the method for producing activated carbon for deodorizer of the present invention, the bromine compound is hydrogen bromide . The attaching step is preferably a step of attaching hydrogen bromide to the activated carbon until the pH of the activated carbon becomes 2.3 or less.
[0022]
The bromine compound is preferably added at 1 to 30 parts by weight in terms of bromine with respect to 100 parts by weight of activated carbon. If the amount is less than 1 part by weight, the effect of impregnation cannot be obtained.
[0023]
Moreover, a conventionally well-known compound can also be used for a bromine compound. For example, hydrogen bromide and potassium bromide can be mentioned.
[0024]
In the production method of the present invention, as the activated carbon, activated carbon used in the production of ordinary activated carbon for a deodorant can be used. The activated carbon preferably has a BET specific surface area of 50 to 2000 m 2 / g. Moreover, the raw material of activated carbon is not limited, Activated carbon from conventionally well-known materials, such as a palm and coal, can be used.
[0025]
The activated carbon preferably has a small iodine adsorption amount. The iodine adsorption amount of the activated carbon varies depending on the pore diameter / specific surface area. However, even if the activated carbon is the same, the adsorption amount changes if the surface state changes. In the production method of the present invention, activated carbon having desired performance can be produced by reducing the adsorption amount of iodine. Preferably, the iodine adsorption amount is 1030 mg / g or less.
[0026]
In the method for producing activated carbon for a deodorant of the present invention, since the treatment with an oxidizing agent is performed before the bromine compound is added, the bromine compound is attached in a state where the reducing property of the activated carbon is lowered. That is, in the deodorant activated carbon produced according to the present invention, the Br intermediate is not decomposed by the activated carbon due to the reduced reducibility of the activated carbon. As a result, the activated carbon for a deodorant produced according to the present invention exhibits high purification performance.
[0027]
(Activated carbon for deodorizer)
The activated carbon for the deodorizer of the present invention includes an oxidation step for washing the activated carbon with an acid solution, a water washing step for washing the activated carbon subjected to the oxidation step, a drying step for drying the activated carbon subjected to the water washing step, and a drying step. And an attaching step of immersing the activated carbon subjected to the treatment in a hydrogen bromide aqueous solution containing hydrogen bromide . That is, the deodorant activated carbon of the present invention is a deodorant activated carbon produced by the above-described production method.
[0028]
The activated carbon for a deodorizer of the present invention is performed with an acid solution before the bromine compound is impregnated. Since the treatment is performed with an acid solution , the bromine compound is impregnated in a state where the reducing ability of the activated carbon is lowered. That is, in the activated carbon for a deodorizer of the present invention, the Br intermediate is not decomposed by the activated carbon due to the reduction of the reducing property of the activated carbon. As a result, the deodorant activated carbon of the present invention exhibits high purification performance over a long period of time.
[0029]
The oxidation step is a step of reducing the reducibility of the activated carbon from the acid solution , and the treatment method is not particularly limited as long as the treatment can reduce the reducibility of the activated carbon. Further, the acid solution is not particularly limited, and acids such as nitric acid, sulfuric acid, hydrochloric acid and the like can be used.
[0030]
The oxidation step is preferably a step of washing activated carbon with an acid solution. The acid solution refers to a solution containing an acid-dissolved solution such as an acid aqueous solution. Moreover, washing | cleaning shows the process which makes an acid solution contact the surface of activated carbon. The reducibility of the activated carbon can be reduced by washing the activated carbon with an acid solution. And since an oxidizing agent is a solution, an oxidizing agent can contact the whole surface of activated carbon. That is, the reducibility of activated carbon can be reduced evenly. Furthermore, since the acid solution is easy to handle, an increase in processing cost can be suppressed.
[0031]
The activated carbon for a deodorizer of the present invention has a water washing step for washing the activated carbon subjected to the oxidation step and a drying step for drying the activated carbon subjected to the water washing step. By rinsing in the water washing step and then drying in the drying step, the bromine compound can be attached in the subsequent attachment step without causing unevenness.
[0032]
The acid solution is preferably an aqueous nitric acid solution. By using an aqueous nitric acid solution as the acid solution, the reducing ability of the activated carbon can be reduced. The concentration of the aqueous nitric acid solution is not particularly limited, but handling of the solution becomes difficult if the concentration becomes excessively high. The concentration of the aqueous nitric acid solution is preferably 0.3N.
[0033]
The attachment step is a step of attaching a bromine compound to activated carbon, and the treatment method is not particularly limited as long as it is a treatment capable of attaching the bromine compound to activated carbon. That is, the attachment can be performed by a conventionally known means. A step of preparing an aqueous solution of a bromine compound and immersing activated carbon in this aqueous solution is preferred. Moreover, a conventionally well-known compound can also be used for a bromine compound. For example, hydrogen bromide and potassium bromide can be mentioned.
In the activated carbon for deodorizer of the present invention, the attaching step is a step of immersing the activated carbon that has been subjected to the drying step in a hydrogen bromide aqueous solution containing hydrogen bromide.
In the activated carbon for a deodorizer of the present invention, the bromine compound is hydrogen bromide. The attaching step is preferably a step of attaching hydrogen bromide to the activated carbon until the pH of the activated carbon becomes 2.3 or less.
[0034]
As the activated carbon, activated carbon used in the production of ordinary activated carbon for a deodorant can be used. The activated carbon preferably has a BET specific surface area of 50 to 2000 m 2 / g. Moreover, the raw material of activated carbon is not limited, Activated carbon from conventionally well-known materials, such as a palm and coal, can be used.
[0035]
The activated carbon has an iodine adsorption amount of 1030 mg / g or less so that the iodine adsorption amount on the activated carbon after loading is 920 mg / g or less. And it is preferable that activated carbon has a small iodine adsorption amount.
[0036]
The activated carbon for an adsorbent of the present invention is preferably as the pH is low. This is because the lower the pH is, the more likely the brominated intermediate of the bromine compound added is generated on the activated carbon. The pH of the adsorbent activated carbon is preferably 2.5 or less, and more preferably 2.3 or less.
In the activated carbon for an adsorbent of the present invention, the bromine compound is hydrogen bromide, and the attaching step is preferably a step of attaching hydrogen bromide to the activated carbon so that the activated carbon has a pH of 2.3 or less.
In the activated carbon for an adsorbent of the present invention, the pH of the activated carbon after the attaching step is preferably 2.3 or less .
[0037]
The pH of the activated carbon for adsorbent was measured by weighing 3 ± 0.1 g of the activated carbon sample, putting it in a 100 ml beaker, adding 100 ml of pure water, and heating on an electric heater. The beaker was boiled for 5 minutes without stirring and then cooled. After cooling to room temperature, pure water was added to make 100 ml, and after stirring well, the pH of the aqueous solution was measured, and this value was taken as the pH of the activated carbon.
[0038]
Since the activated carbon for a deodorizing agent of the present invention is treated with an oxidizing agent before attaching the bromine compound, the bromine compound is attached in a state where the reducing ability of the activated carbon is lowered. That is, in the activated carbon for a deodorizer of the present invention, the Br intermediate is not decomposed by the activated carbon due to the reduction of the reducing property of the activated carbon. As a result, the activated carbon for a deodorizer of the present invention exhibits high purification performance.
[0039]
【Example】
Hereinafter, the present invention will be described using examples.
[0040]
As an example of the present invention, activated carbon for a deodorant was produced. In addition, the activated carbon used as the deodorant activated carbon in the following examples was coal-based pellet-shaped activated carbon having a diameter of 4 mm, a BET specific surface area of 1100 m 2 / g, and an iodine adsorption amount of 1050 mg / g .
[0041]
Example 1
First, a 0.3N nitric acid aqueous solution was prepared.
[0042]
Subsequently, 800 g of activated carbon was immersed in 1200 ml of an aqueous nitric acid solution. The immersion of the activated carbon in the nitric acid aqueous solution was maintained for 1 hour after sufficiently stirring until the activated carbon was completely immersed after being charged into the aqueous solution.
[0043]
After holding, filtration was performed to take out activated carbon. The extracted activated carbon was washed with water until the pH of the waste water reached 6.0 or higher. Then, it dried at 80 degreeC with the drying furnace until the water | moisture content became 5% or less.
[0044]
Here, the moisture content, packing density, benzene adsorption amount, iodine adsorption amount and pH of the activated carbon after drying were measured. The measurement results are shown in Table 1.
[0045]
The water content was measured by weighing about 10 g of a sample into a flat weighing bottle with a known weight, expanding the sample in the weighing bottle so that the sample had a uniform thickness, and plugging it, and weighing the weight accurately to the unit of 10 mg. Subsequently, the stopper was removed, and the weighing bottle and stopper were put into a dryer and dried at 115 ± 5 ° C. for 3 hours. After drying, the mixture was cooled in a desiccator, stoppered, and the weight was measured. The amount of change in weight before and after drying was taken as the amount of water.
[0046]
For the measurement of the packing density, the sample was put in a packing density measuring device, and 100 ml of the sample was weighed in a measuring cylinder over 100 to 133 seconds. The weights of the graduated cylinder containing the sample and the graduated cylinder not containing the sample were measured to the nearest 0.1 g. The weight of the sample was measured from both weights, and the packing density was calculated.
[0047]
The amount of benzene adsorbed is measured by putting about 10 g of a sample into an adsorption test U-tube whose weight has been measured to the nearest 1 mg and measuring the total weight. A U-tube is set in a benzene adsorption test device adjusted to 25 ° C ± 0.5 ° C, and a saturated vapor of dried benzene or benzene gas diluted to 1/10 is vented, so that the weight change of the container is within 5 mg. Continue until. The adsorption amount is calculated from the weight increase at this time.
[0048]
For the measurement of iodine adsorption amount, 0.5 g of the crushed sample was weighed out and put into a 100 ml Erlenmeyer flask with a brown stopper, and further 50 ml of 0.05 ml / l iodine solution was added. After shaking for 15 minutes at room temperature using a shaker, transfer to a 50 ml sedimentation tube and precipitate with a centrifuge. 10 ml of the supernatant after separation is taken and titrated with 0.1 mol / l sodium thiosulfate solution. When the (iodine) yellow color of the solution becomes thin, 1 ml of 1 wt% starch solution as an indicator is added and the blue color disappears. The titration was continued until the adsorption amount was calculated from the titration amount.
[0049]
For the measurement of pH, a sample was weighed at 3 ± 0.1 g, put into a 100 ml beaker, and further 100 ml of pure water was added and heated on an electric heater. The beaker was boiled for 5 minutes without stirring and then cooled. After cooling to room temperature, pure water was added to make 100 ml, and after stirring well, the pH of the aqueous solution was measured, and this value was taken as the pH of the activated carbon.
[0050]
[Table 1]
A bromine aqueous solution containing 30 parts by weight of hydrogen bromide (HBr) in terms of Br was prepared with respect to 100 parts by weight of activated carbon.
[0052]
Then, activated carbon was immersed in the aqueous bromine solution to absorb water and dried.
[0053]
The activated carbon for deodorizers of Example 1 was manufactured by the above.
[0054]
The water content, packing density, benzene adsorption amount, iodine adsorption amount and pH of the produced deodorant activated carbon were measured, and the measurement results are shown in Table 2.
[0055]
[Table 2]
(Example 2)
An activated carbon for a deodorizing agent was produced in the same manner as in Example 1 except that sulfuric acid was used instead of nitric acid.
[0057]
The water content, packing density, benzene adsorption amount, iodine adsorption amount and pH of the activated carbon after acid cleaning and the activated carbon for the deodorizer were measured, and the measurement results are shown in Tables 1 and 2.
[0058]
(Example 3)
A deodorant activated carbon was produced in the same manner as in Example 1 except that hydrochloric acid was used instead of nitric acid.
[0059]
The water content, packing density, benzene adsorption amount, iodine adsorption amount and pH of the activated carbon after acid cleaning and the activated carbon for the deodorizer were measured, and the measurement results are shown in Tables 1 and 2.
[0060]
Example 4
A deodorant activated carbon was produced in the same manner as in Example 1 except that the nitric acid concentration of the aqueous nitric acid solution was changed to a predetermined iodine adsorption amount .
[0061]
In addition, the activated carbon for a deodorizer manufactured in the present Example had an iodine adsorption amount of 990 mg / g.
[0062]
(Example 5)
A deodorant activated carbon was produced in the same manner as in Example 1 except that the nitric acid concentration of the aqueous nitric acid solution was changed to a predetermined iodine adsorption amount .
[0063]
In addition, the activated carbon for deodorizers manufactured in the present Example had an iodine adsorption amount of 1020 mg / g.
[0066]
(Comparative Example 1)
The activated carbon for a deodorizer was manufactured similarly to Example 1 except not performing acid washing.
[0067]
The moisture content, packing density, benzene adsorption amount, iodine adsorption amount and pH of the activated carbon before HBr attachment and the activated carbon for the deodorizer were measured, and the measurement results are shown in Tables 1 and 2.
[0068]
(Comparative Example 2)
Deactivated carbon for deodorizer was produced in the same manner as in Example 1 except that nitrogen treatment was performed instead of acid cleaning.
[0069]
The nitrogen treatment applied to the activated carbon in this comparative example is shown below.
[0070]
Activated carbon was put into an atmosphere furnace capable of adjusting the heating atmosphere, and N 2 gas was continuously introduced into the furnace at a flow rate of 5 L / min. In this state, the temperature was increased to 800 ° C. at a temperature increase rate of 5 ° C./min and held at 800 ° C. for 1 hour. After holding, it was allowed to cool in an N 2 gas atmosphere.
[0071]
The moisture content, packing density, benzene adsorption amount, iodine adsorption amount and pH of the activated carbon before HBr attachment and the activated carbon for the deodorizer were measured, and the measurement results are shown in Tables 1 and 2.
(Comparative Example 3)
A deodorant activated carbon was produced in the same manner as in Example 1 except that the nitric acid concentration of the aqueous nitric acid solution was changed to a predetermined iodine adsorption amount.
In addition, the activated carbon for deodorizers manufactured in this comparative example had an iodine adsorption amount of 1040 mg / g.
[0072]
(Evaluation)
As an evaluation of the activated carbon for deodorizers of Examples and Comparative Examples, methyl sulfide was purified and the purification rate was measured.
[0073]
For the purification of methyl sulfide, a test gas containing methyl sulfide was circulated in a column holding activated carbon for deodorizing agent therein, and the concentration of methyl sulfide in the test gas that passed through the column was measured to obtain a purification rate.
[0074]
Specifically, first, 6 ml of activated carbon for deodorizers of Examples or Comparative Examples was packed in a cylindrical column. In this column, the deodorant activated carbon occupies a space of φ30 mm and an axial length of 85 mm.
[0075]
Then, a test gas containing methyl sulfide was flowed into the column at a space velocity of 33333 hr −1 and a linear velocity of 11.8 cm / sec. The test gas was a gas containing methyl sulfide at a ratio of 10 ppm in air, and was supplied into the column at 25 ° C. and
[0076]
The content of methyl sulfide in the test gas that passed through the column was measured, and the purification rate of methyl sulfide of the activated carbon for deodorizer was determined from the content before passing through the column. The measurement results of the purification rate are shown in FIG. 1 and FIG. In addition, the measurement of the amount of methyl sulfide was performed using the gas chromatograph mass spectrometer (the Shimadzu Corporation make, GC-8AP). The analysis conditions were as follows: column: β, β′-ODPN 25% Chromosorb 60-80 mesh, φ3.0 mm, length 3000 mm, temperature; inlet / detector: 150 ° C., column: 70 ° C.
[0077]
From FIG. 1, it can be seen that the activated carbon for deodorizers of Examples 1 to 3 in which the activated carbon was acid-washed before HBr was attached had a higher purification rate than the comparative example. Moreover, the purification rate of the activated carbon for the deodorizer of each Example is substantially maintained even if time passes. In contrast, the deodorant activated carbon of the comparative example has a purification rate that decreases as the purification time progresses, and the purification rate after 120 minutes is significantly lower than that at the start of the purification test.
[0078]
That is, the deodorant activated carbon of each Example can maintain a high purification rate for methyl sulfide for a long time.
[0079]
Moreover, it turns out that the activated carbon for deodorizers of Example 1 and Examples 4-5 has a purification rate higher than Comparative Examples 1 and 3 from FIG. Furthermore, in each Example, it turns out that the purification rate is so high that the iodine adsorption amount is small.
[0080]
【Effect of the invention】
In the method for producing activated carbon for a deodorant of the present invention, since the treatment with an oxidizing agent is performed before the bromine compound is added, the bromine compound is attached in a state where the reducing property of the activated carbon is lowered. That is, in the deodorant activated carbon produced according to the present invention, the Br intermediate is not decomposed by the activated carbon due to the reduced reducibility of the activated carbon. As a result, the activated carbon for a deodorizer produced according to the present invention suppresses a decrease in purification performance and exhibits high purification performance. Furthermore, the activated carbon for a deodorizer produced according to the present invention exhibits an effect that a sufficiently high purification performance is maintained even if odorous substances are removed for a long time.
[Brief description of the drawings]
FIG. 1 is a diagram showing the results of measuring the purification rate of methyl sulfide of activated carbon for deodorizers of Examples 1 to 3 and Comparative Example.
2 is a graph showing the results of measuring the purification rate of methyl sulfide of activated carbon for deodorizers of Examples 1 and 4 to 5. FIG.
Claims (8)
該酸化工程が施された該活性炭を水洗する水洗工程と、
該水洗工程が施された該活性炭を乾燥させる乾燥工程と、
該乾燥工程が施された該活性炭を臭化水素を含有する臭化水素水溶液に浸漬する添着工程と、
を有することを特徴とする脱臭剤用活性炭の製造方法。 An oxidation step of washing the activated carbon with an acid solution ;
A water washing step of washing the activated carbon that has been subjected to the oxidation step;
A drying step of drying the activated carbon that has been subjected to the water washing step;
An attaching step of immersing the activated carbon subjected to the drying step in a hydrogen bromide aqueous solution containing hydrogen bromide ;
A method for producing activated carbon for a deodorant, comprising:
該酸化工程が施された該活性炭を水洗する水洗工程と、
該水洗工程が施された該活性炭を乾燥させる乾燥工程と、
該乾燥工程が施された該活性炭を臭化水素を含有する臭化水素水溶液に浸漬する添着工程と、
を施してなることを特徴とする脱臭剤用活性炭。 An oxidation step of washing the activated carbon with an acid solution ;
A water washing step of washing the activated carbon that has been subjected to the oxidation step;
A drying step of drying the activated carbon that has been subjected to the water washing step;
An attaching step of immersing the activated carbon subjected to the drying step in a hydrogen bromide aqueous solution containing hydrogen bromide ;
Activated carbon for deodorizing agent characterized by being subjected to the treatment.
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| JPS5799334A (en) * | 1980-12-05 | 1982-06-21 | Takeda Chem Ind Ltd | Activated carbon for deodorization and removal of offensive odor component |
| JPH07289888A (en) * | 1994-04-28 | 1995-11-07 | Takeda Chem Ind Ltd | Activated carbon and its use |
| JP3830247B2 (en) * | 1997-10-29 | 2006-10-04 | 日本エンバイロケミカルズ株式会社 | Bromine impregnated activated carbon and method for producing the same |
| JP3830234B2 (en) * | 1997-07-25 | 2006-10-04 | 日本エンバイロケミカルズ株式会社 | Bromine impregnated activated carbon |
| JPH11137655A (en) * | 1997-11-10 | 1999-05-25 | Toyota Central Res & Dev Lab Inc | Deodorant |
| JP3766771B2 (en) * | 1999-11-08 | 2006-04-19 | 日本エンバイロケミカルズ株式会社 | Adsorbent |
| JP3634263B2 (en) * | 2000-12-28 | 2005-03-30 | Ｊｆｅエンジニアリング株式会社 | Method for producing deodorant |
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