JP2670972B2 - How to remove trace acetaldehyde from air - Google Patents
How to remove trace acetaldehyde from airInfo
- Publication number
- JP2670972B2 JP2670972B2 JP5329623A JP32962393A JP2670972B2 JP 2670972 B2 JP2670972 B2 JP 2670972B2 JP 5329623 A JP5329623 A JP 5329623A JP 32962393 A JP32962393 A JP 32962393A JP 2670972 B2 JP2670972 B2 JP 2670972B2
- Authority
- JP
- Japan
- Prior art keywords
- acetaldehyde
- air
- adsorbent
- manganese dioxide
- treated
- 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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Landscapes
- Treating Waste Gases (AREA)
- Separation Of Gases By Adsorption (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空気中に含まれている
微量のアセトアルデヒドを除去する方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a trace amount of acetaldehyde contained in air.
【０００２】[0002]
【従来の技術】空気中には多種類の微量成分が含まれて
おり、それらの種類や量は環境によって大いに異なる
が、健康上有害な成分や不快な臭気成分はたとえそれが
微量であっても徹底的に除去することが望まれる。この
ため、近年、オフィスビルや住宅などの閉鎖空間内で発
生するものについては、換気と併用して、空気清浄器や
エアコンディショナー等の空調設備に付属させる有害ガ
ス除去機能を向上させ、清浄な生活環境を確保しようと
する努力がなされている。2. Description of the Related Art Many kinds of trace components are contained in the air, and their kinds and amounts vary greatly depending on the environment. It is also desirable to thoroughly remove these. For this reason, in recent years, for those generated in enclosed spaces such as office buildings and houses, in combination with ventilation, the harmful gas removal function attached to air conditioning equipment such as air purifiers and air conditioners has been improved, and cleanliness has been improved. Efforts are being made to secure a living environment.
【０００３】通常の居住環境内で発生する有害ガスの代
表的なものは、煙草の煙である。その中に含まれている
微量成分で除去すべきものとして検討されているのは、
アンモニア、酢酸およびアセトアルデヒドであって、い
ずれも不快な刺激臭の原因となり、健康上有害でもあ
る。このうち、アンモニアと酢酸については活性炭やゼ
オライトを用いる除去手段がほぼ確立されているが、ア
セトアルデヒドについては、真に有効で実施も容易な除
去方法はまだ見いだされていない。アセトアルデヒド
は、煙草から発生するばかりでなく、台所その他の調理
場の空気中にも含まれていることが確認されている。A typical harmful gas generated in a normal living environment is cigarette smoke. It is considered that it should be removed by the trace components contained in it,
Ammonia, acetic acid and acetaldehyde, all of which cause unpleasant pungent odors and are also harmful to health. Of these, removal means using activated carbon or zeolite for ammonia and acetic acid have been almost established, but for acetaldehyde, a truly effective and easy-to-implement removal method has not yet been found. Acetaldehyde has been found not only to be emitted from tobacco but also found in the air of kitchens and other kitchens.
【０００４】従来提案された空気中アセトアルデヒドの
除去方法の代表的なものは、活性炭、シリカゲル、ゼオ
ライト等の吸着剤を用いる方法、および、白金やパラジ
ウムなど、貴金属を触媒に用いて高温度で燃焼させる方
法などである。しかしながら、吸着剤を用いる方法は、
アセトアルデヒドを吸着する能力に優れた吸着剤が無い
ためしばしば吸着剤の交換もしくは再生が必要であり、
しかも、再生サイクルで脱着されてくる有害ガスをどの
ように処分するかという問題点もある。一方、触媒燃焼
法は、数百ppm以上の高濃度アセトアルデヒド含有空気
には有効であっても、煙草の煙が充満した室内の空気の
ように１ppm程度の微量アセトアルデヒドを含有する空
気の処理にはあまり有効でなく、産業分野でしか実施さ
れていない。しかも、高価な貴金属触媒を必要とするた
め処理コストが高くなるという問題点があった。[0004] Representative methods for removing acetaldehyde in the air, which have conventionally been proposed, include a method using an adsorbent such as activated carbon, silica gel and zeolite, and a method of burning at a high temperature using a noble metal such as platinum or palladium as a catalyst. And the like. However, the method using an adsorbent is
Since there is no adsorbent with excellent ability to adsorb acetaldehyde, it is often necessary to replace or regenerate the adsorbent,
Moreover, there is a problem of how to dispose of the harmful gas desorbed in the regeneration cycle. On the other hand, the catalytic combustion method is effective for air containing high concentrations of acetaldehyde of several hundred ppm or more, but is not suitable for treating air containing trace amounts of acetaldehyde of about 1 ppm, such as indoor air filled with cigarette smoke. Not very effective, implemented only in industrial fields. In addition, there is a problem that the processing cost is increased because an expensive noble metal catalyst is required.
【０００５】[0005]
【発明が解決しようとする課題】そこで本発明の目的
は、空気中に含まれる微量のアセトアルデヒドを効果的
に且つ安価に除去する手段を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a means for effectively and inexpensively removing a trace amount of acetaldehyde contained in air.
【０００６】[0006]
【課題を解決するための手段】本発明による空気中のア
セトアルデヒドの除去方法は、処理対象となるアセトア
ルデヒドを含有する被処理空気を吸着剤に接触させて空
気中のアセトアルデヒドを吸着剤に吸着させ、引き続き
被処理空気を送入しつつ、アセトアルデヒドを吸着した
吸着剤を加熱して吸着されたアセトアルデヒドを脱着さ
せ、脱着されたアセトアルデヒドが混入した被処理空気
を加熱された比表面積が５０mm 2 /g以上の二酸化マンガ
ンに接触させてアセトアルデヒドを接触酸化することを
特徴とするものである。The method for removing acetaldehyde in the air according to the present invention comprises contacting air to be treated containing acetaldehyde to be treated with an adsorbent to adsorb the acetaldehyde in the air to the adsorbent, Continue
While feeding the air to be treated , the adsorbent having adsorbed acetaldehyde was heated to desorb the adsorbed acetaldehyde, and the air to be treated mixed with the desorbed acetaldehyde had a heated specific surface area of 50 mm 2. / g or more manganese dioxide is brought into contact, and acetaldehyde is catalytically oxidized.
【０００７】上記本発明は、比表面積の大きい二酸化マ
ンガンが加熱状態において空気中の酸素によるアセトア
ルデヒド酸化分解反応の触媒となるという新規な知見に
基づくものである。The present invention is based on the novel finding that manganese dioxide having a large specific surface area serves as a catalyst for the oxidative decomposition reaction of acetaldehyde by oxygen in the air in a heated state.
【０００８】二酸化マンガン触媒の活性は、比表面積の
大きい二酸化マンガンほど優れている。したがって、本
発明に用いる二酸化マンガンとしては比表面積が５０m 2
/g以上のものを用いる（ただし、比表面積はＢＥＴ法に
より測定される値である。)。比表面積が大きく触媒活性
に優れている二酸化マンガンの一例は、オゾン分解触媒
として市販されているものである。The activity of the manganese dioxide catalyst is superior as the manganese dioxide having a larger specific surface area. Therefore, the manganese dioxide used in the present invention has a specific surface area of 50 m 2.
/ g or more is used (however, the specific surface area is a value measured by the BET method). An example of manganese dioxide having a large specific surface area and excellent catalytic activity is commercially available as an ozone decomposition catalyst.
【０００９】一方、本発明において用いる吸着剤として
は、常温において希薄なアセトアルデヒド含有空気から
アセトアルデヒドを吸着する能力に優れ且つ加熱による
再生が容易なものであれば何でも使用することができる
が、適当な吸着剤の具体例としては、ハイシリカゼオラ
イト、モルデナイト等がある。比表面積が大きい二酸化
マンガンは常温ではアセトアルデヒドをよく吸着するこ
とが確認されている。したがって、本発明の方法で使用
する吸着剤として比表面積が大きい二酸化マンガンを採
用することもできる。On the other hand, as the adsorbent used in the present invention, any adsorbent can be used as long as it has excellent ability to adsorb acetaldehyde from dilute acetaldehyde-containing air at room temperature and can be easily regenerated by heating. Specific examples of the adsorbent include high silica zeolite and mordenite. It has been confirmed that manganese dioxide having a large specific surface area adsorbs acetaldehyde well at room temperature. Therefore, manganese dioxide having a large specific surface area can also be used as the adsorbent used in the method of the present invention.
【００１０】本発明を実施するには、アセトアルデヒド
を含有する被処理空気を上述のような吸着剤と接触させ
るための、吸着剤再生手段を備えた吸着装置、および、
吸着剤から脱着されたアセトアルデヒドを二酸化マンガ
ン触媒と接触させて酸化分解するための接触酸化装置が
必要である。In order to carry out the present invention, an adsorption device provided with adsorbent regeneration means for bringing the air to be treated containing acetaldehyde into contact with the adsorbent as described above, and
A catalytic oxidizer for contacting acetaldehyde desorbed from the adsorbent with a manganese dioxide catalyst to oxidize and decompose it is required.
【００１１】吸着装置も接触酸化装置も、通常のガス処
理装置にならって構成された任意の構造のものを採用す
ることができる。最も簡単なのは、粒状の吸着剤（もし
くは二酸化マンガン触媒）を加熱装置を備えた適当な管
または容器に充填し、吸着剤充填層と触媒充填層を貫通
して被処理空気が流れるようにしたものである。吸着剤
や触媒は、任意の担体に担持させておいてもよい。吸着
剤（もしくは二酸化マンガン触媒）をハニカム構造の担
体に担持させた装置は、圧力損失の少ない処理が可能で
あり好ましい。As the adsorption device and the catalytic oxidation device, those having an arbitrary structure constituted after a normal gas treatment device can be adopted. The simplest method is to fill the adsorbent (or manganese dioxide catalyst) in the form of particles into a suitable tube or container equipped with a heating device so that the air to be treated flows through the adsorbent-packed layer and the catalyst-packed layer. Is. The adsorbent and the catalyst may be supported on any carrier. An apparatus in which an adsorbent (or a manganese dioxide catalyst) is supported on a carrier having a honeycomb structure is preferable because treatment with a small pressure loss is possible.
【００１２】本発明の方法は、吸着剤と二酸化マンガン
触媒を分離して直列に配置せず、それらを混合して充填
するか担持させた吸着・反応装置を用いて実施すること
もできる。その場合は、吸着剤から脱着されたアセトア
ルデヒドが直ちに周辺の二酸化マンガン触媒の作用によ
り酸化分解反応を起こすことになる。The method of the present invention can also be carried out by using an adsorption / reaction device in which the adsorbent and the manganese dioxide catalyst are not separately arranged in series but are mixed and filled or supported. In that case, acetaldehyde desorbed from the adsorbent immediately causes an oxidative decomposition reaction by the action of the manganese dioxide catalyst in the vicinity.
【００１３】本発明によるアセトアルデヒド含有空気の
処理は、常温で吸着剤にアセトアルデヒドを吸着させる
アセトアルデヒド吸着サイクルと、アセトアルデヒドを
吸着した吸着剤を加熱してアセトアルデヒドを脱着さ
せ、脱着されたアセトアルデヒドを直ちに二酸化マンガ
ン触媒と接触させて酸化分解する再生サイクルとを繰り
返すことにより行う。The treatment of acetaldehyde-containing air according to the present invention includes the acetaldehyde adsorption cycle in which adsorbent adsorbs acetaldehyde at room temperature, the adsorbent adsorbing acetaldehyde is heated to desorb acetaldehyde, and the desorbed acetaldehyde is immediately converted to manganese dioxide. This is carried out by repeating a regeneration cycle in which the catalyst is brought into contact with the catalyst to undergo oxidative decomposition.
【００１４】吸着サイクルにおいては、吸着剤に吸着さ
れたアセトアルデヒドの量が増すにつれて出口アセトア
ルデヒド濃度が上昇するので、適当な段階で被処理空気
の送入を中止し、吸着剤を加熱して再生サイクルに移
る。再生サイクルにおいては、吸着剤を、その吸着剤固
有の必要再生温度に加熱し、二酸化マンガン触媒も活性
発現温度（約１００〜３００℃）に加熱する。その間も
被処理空気の送入を継続するが、風量は、吸着サイクル
の場合よりも減らしてよい。In the adsorption cycle, the outlet acetaldehyde concentration rises as the amount of acetaldehyde adsorbed by the adsorbent increases, so the feed of the air to be treated is stopped at an appropriate stage, and the adsorbent is heated to regenerate the cycle. Move on to. In the regeneration cycle, the adsorbent is heated to the required regeneration temperature specific to the adsorbent, and the manganese dioxide catalyst is also heated to the activity development temperature (about 100 to 300 ° C). During that time, the air to be treated is continuously fed, but the air volume may be reduced as compared with the adsorption cycle.
【００１５】吸着剤から脱着されたアセトアルデヒド
は、再生サイクルにおいても送入される被処理空気中の
アセトアルデヒドと共に二酸化マンガン触媒の表面に達
し、被処理空気中の酸素と反応して炭酸ガスと水蒸気に
なる。生じた炭酸ガスと水蒸気を含む空気は、通常、そ
のまま環境中に放出することができる。本発明によるア
セトアルデヒド除去方法は、吸着装置と接触酸化装置を
空気清浄器やエアコンディショナーに付属させることに
より、住居、オフィスビル等において大小いずれの規模
でも容易に実施することができる。The acetaldehyde desorbed from the adsorbent reaches the surface of the manganese dioxide catalyst together with the acetaldehyde in the air to be treated, which is also fed in the regeneration cycle, and reacts with oxygen in the air to be treated to form carbon dioxide gas and water vapor. Become. The generated air containing carbon dioxide gas and water vapor can usually be released into the environment as it is. The acetaldehyde removal method according to the present invention can be easily carried out in a large scale in a house, an office building, etc. by attaching an adsorption device and a catalytic oxidation device to an air purifier or an air conditioner.
【００１６】[0016]
実施例１ 吸着剤としてハイシリカゼオライト・ＺＳＭ−５（モー
ビルオイル社，ＳiＯ2／Ａl2Ｏ3＝５０）を用い、また
二酸化マンガンとしてオゾン分解用二酸化マンガン触媒
（市販品；比表面積２３０m2/g）を用い、両者を１：１
の比率で混合してハニカム構造担体に担持させて、下記
の条件でアセトアルデヒド除去試験を行なった。Example 1 A high-silica zeolite ZSM-5 (Mobile Oil, SiO 2 / Al 2 O 3 = 50) was used as an adsorbent, and manganese dioxide catalyst for ozone decomposition was used as manganese dioxide (commercial product; specific surface area 230 m 2 / g) and both are 1: 1
And carried on a honeycomb structured carrier, and an acetaldehyde removal test was performed under the following conditions.
【００１７】被処理空気：アセトアルデヒド５ppmを含
有させた常温空気 吸着サイクル：被処理空気を空間速度１００００／Hrで
６０分間流す。 再生サイクル：被処理空気を吸着サイクルと同一条件で
流しながら、ハニカム構造担体を１５０℃に１０分間加
熱する。 上記条件で吸着サイクルと再生サイクルを交互に繰り返
し、合計２０サイクル（２３時間）、処理を続けた。Air to be treated: normal temperature air containing 5 ppm of acetaldehyde Adsorption cycle: Air to be treated is flown at a space velocity of 10,000 / Hr for 60 minutes. Regeneration cycle: The honeycomb structure carrier is heated to 150 ° C. for 10 minutes while flowing the air to be treated under the same conditions as in the adsorption cycle. The adsorption cycle and the regeneration cycle were alternately repeated under the above conditions, and the treatment was continued for a total of 20 cycles (23 hours).
【００１８】吸着サイクルにおいては、装置出口側でア
セトアルデヒド濃度を測定し、次式によりアセトアルデ
ヒド除去率（％）を算出した。 アセトアルデヒド除去率（％）＝（入口濃度−出口濃
度）×１００／入口濃度In the adsorption cycle, the acetaldehyde concentration was measured on the outlet side of the apparatus, and the acetaldehyde removal rate (%) was calculated by the following equation. Acetaldehyde removal rate (%) = (inlet concentration-outlet concentration) x 100 / inlet concentration
【００１９】結果：第１回目の吸着サイクルにおいて、
６０分後、アセトアルデヒド除去率は１００％であっ
た。再生サイクルにおいてハニカム構造担体を１５０℃
に加熱することにより再生すると、次の吸着サイクルに
おいても上記初期性能と全く同様の性能が発揮された。
また、再生による初期性能の回復は、吸着−再生を２０
サイクル繰り返した後も変わらなかった。Results: In the first adsorption cycle,
After 60 minutes, the acetaldehyde removal rate was 100%. Honeycomb structure carrier at 150 ℃ in regeneration cycle
When it was regenerated by heating to 1, the same performance as the above initial performance was exhibited in the next adsorption cycle.
In addition, the recovery of the initial performance by regeneration requires 20 times of adsorption-regeneration.
It did not change after repeating the cycle.
【００２０】実施例２ 実施例１の場合と同じ吸着剤と二酸化マンガン触媒を用
いたが、それらを別個にハニカム構造担体に担持させ、
吸着剤を風上に配置し二酸化マンガンを風下に配置し
て、アセトアルデヒド吸着試験を行なった。試験条件は
実施例１と同様にした。その結果は実施例１と全く同様
であって、最初のサイクルにおいても２０サイクル目に
おいてもアセトアルデヒド除去率は吸着サイクル末期も
１００％を維持した。Example 2 The same adsorbent and manganese dioxide catalyst as in Example 1 were used, but they were separately supported on a honeycomb structure carrier,
An acetaldehyde adsorption test was performed with the adsorbent positioned upwind and manganese dioxide positioned downwind. The test conditions were the same as in Example 1. The results were exactly the same as in Example 1, and the acetaldehyde removal rate was maintained at 100% at the end of the adsorption cycle in both the first cycle and the 20th cycle.
【００２１】[0021]
【発明の効果】本発明によれば、貴金属触媒に比べると
はるかに安価な二酸化マンガン触媒を使用して空気中の
アセトアルデヒドを確実に除去することができる。本発
明の方法は、吸着剤を用いて通常は常温で吸着処理を行
い、再生サイクルのときだけ吸着剤および二酸化マンガ
ン触媒を加熱してアセトアルデヒドを酸化分解するもの
であるから、常時加熱された触媒を用いて空気中のアセ
トアルデヒドを酸化分解する方法よりも触媒活性が長持
ちするだけでなく熱経済上有利であり、さらに処理済み
空気の温度上昇も僅かで済む。According to the present invention, acetaldehyde in the air can be reliably removed using a manganese dioxide catalyst which is much cheaper than a noble metal catalyst. In the method of the present invention, adsorption treatment is usually carried out at room temperature using an adsorbent, and the adsorbent and manganese dioxide catalyst are heated only during the regeneration cycle to oxidatively decompose acetaldehyde. In addition to having a longer catalytic activity than the method of oxidatively decomposing acetaldehyde in the air by using, it is advantageous in terms of thermo-economics, and the temperature rise of treated air can be small.
【００２２】単なる吸着剤を使用する方法と比べても、
本発明の方法は再生サイクルにおいてアセトアルデヒド
が脱着されるわけではなく、無害化された分解ガスが放
出されるだけであるから、脱着ガスの処分に特別の対策
を必要としないという特長がある。Compared with the method using a simple adsorbent,
The method of the present invention does not desorb acetaldehyde in the regeneration cycle, but only releases detoxified decomposing gas, and therefore has the advantage that no special measures are required for the disposal of desorbed gas.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ２４Ｆ 1/00 Ｆ２４Ｆ 1/00 ３７１Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location F24F 1/00 F24F 1/00 371Z
Claims (1)
を吸着剤に接触させて空気中のアセトアルデヒドを吸着
剤に吸着させ、次いで被処理空気を送入しつつ、アセト
アルデヒドを吸着した吸着剤を加熱して吸着されたアセ
トアルデヒドを脱着させ、脱着されたアセトアルデヒド
が混入した被処理空気を加熱された比表面積が５０mm 2 /
g以上の二酸化マンガンに接触させてアセトアルデヒド
を接触酸化することを特徴とする空気中の微量のアセト
アルデヒドを除去する方法。1. A to- be-treated air containing acetaldehyde is brought into contact with an adsorbent to adsorb acetaldehyde in the air to the adsorbent, and then the adsorbent having adsorbed acetaldehyde is heated while feeding the to-be-treated air. Desorbed adsorbed acetaldehyde, desorbed acetaldehyde
The specific surface area of heated air to be treated is 50mm 2 /
Acetaldehyde in contact with more than g manganese dioxide
A method for removing a trace amount of acetaldehyde in air, which comprises catalytically oxidizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5329623A JP2670972B2 (en) | 1993-12-02 | 1993-12-02 | How to remove trace acetaldehyde from air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5329623A JP2670972B2 (en) | 1993-12-02 | 1993-12-02 | How to remove trace acetaldehyde from air |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07171341A JPH07171341A (en) | 1995-07-11 |
| JP2670972B2 true JP2670972B2 (en) | 1997-10-29 |
Family
ID=18223429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5329623A Expired - Fee Related JP2670972B2 (en) | 1993-12-02 | 1993-12-02 | How to remove trace acetaldehyde from air |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2670972B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6546738B2 (en) * | 2014-11-12 | 2019-07-17 | 日立造船株式会社 | Aldehyde decomposition catalyst, exhaust gas treatment facility and exhaust gas treatment method |
| JP6393591B2 (en) * | 2014-11-12 | 2018-09-19 | 日立造船株式会社 | Aldehyde decomposition catalyst, exhaust gas treatment facility, and exhaust gas treatment method |
| KR101538000B1 (en) * | 2014-12-19 | 2015-07-20 | 주식회사 퓨어스피어 | The method of oxidizing hazardous compounds by the mixture containing manganese |
| JP6140326B1 (en) * | 2016-03-08 | 2017-05-31 | 株式会社流機エンジニアリング | Method for regenerating adsorbent of volatile organic compound |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0368419A (en) * | 1989-08-07 | 1991-03-25 | Hitachi Ltd | Deodorizing device and air cleaner using it |
-
1993
- 1993-12-02 JP JP5329623A patent/JP2670972B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07171341A (en) | 1995-07-11 |
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