JP2000000425A - Treatment of low-concentration gaseous organic solvent and its treatment apparatus - Google Patents
Treatment of low-concentration gaseous organic solvent and its treatment apparatusInfo
- Publication number
- JP2000000425A JP2000000425A JP10165217A JP16521798A JP2000000425A JP 2000000425 A JP2000000425 A JP 2000000425A JP 10165217 A JP10165217 A JP 10165217A JP 16521798 A JP16521798 A JP 16521798A JP 2000000425 A JP2000000425 A JP 2000000425A
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- JP
- Japan
- Prior art keywords
- organic solvent
- exhaust gas
- activated carbon
- adsorption
- water vapor
- 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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- Treating Waste Gases (AREA)
- Separation Of Gases By Adsorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、数百ｐｐｍ望まし
くは数十ｐｐｍまでの低濃度の有機溶剤ガスを処理する
にあたり、より省エネルギーでより安全な処理方法を提
供する技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for providing a more energy-saving and safer processing method when processing an organic solvent gas having a low concentration of several hundred ppm, preferably up to several tens ppm.
【０００２】[0002]
【従来の技術】従来、低濃度の有機溶剤排気ガスを処理
する場合、この排気ガスを吸着濃縮装置に使用される吸
着体に通気し、有機溶剤を吸着させ、吸着された有機溶
剤を小量の加熱空気にて吸着材から脱着し、脱着された
小風量・高濃度の有機溶剤ガス（濃縮ガス）を燃焼装置
で処理する濃縮処理方法が有効な処理方法として知られ
ている。2. Description of the Related Art Conventionally, when treating low concentration organic solvent exhaust gas, the exhaust gas is passed through an adsorbent used in an adsorption / concentration device to adsorb the organic solvent and to reduce the amount of the adsorbed organic solvent. An enrichment method in which a small amount of air and a high concentration of an organic solvent gas (enriched gas) desorbed from the adsorbent by the heated air and treated with a combustion device is known as an effective treatment method.
【０００３】本方式で使用される吸着濃縮装置から濃縮
ガスを連続的に得るためには、吸着濃縮装置の吸着と脱
着を繰り返し行うことが必要であり、一般的には図５に
示される様な回転型吸着体を使用した吸着濃縮装置が使
用される。In order to continuously obtain a concentrated gas from the adsorption / concentration apparatus used in this method, it is necessary to repeatedly perform adsorption and desorption of the adsorption / concentration apparatus, and generally, as shown in FIG. An adsorption concentrator using a rotary adsorbent is used.
【０００４】この吸着体には主として活性炭、ゼオライ
ト等の吸着材が使用されるが、汎用性が高く値段も安い
ことから活性炭を吸着材に使用する場合が多々見られ
る。An adsorbent such as activated carbon or zeolite is mainly used for this adsorbent, but activated carbon is often used as an adsorbent because of its versatility and low cost.
【０００５】しかしながら、本方式では、濃縮ガスの風
量は、処理排気ガスの1/10〜1/20程度であり、特に数十
ｐｐｍ以下の有機排気ガスを処理する場合には、濃縮ガ
ス中の有機溶剤の濃度が十分には高くならないので、濃
縮ガスを２次処理する燃焼装置が大型化する、さらには
使用エネルギーが増大するといった問題が生じやすい。However, in this method, the flow rate of the concentrated gas is about 1/10 to 1/20 of that of the treated exhaust gas. Since the concentration of the organic solvent does not become sufficiently high, problems such as an increase in the size of a combustion device for secondary treatment of the concentrated gas and an increase in energy consumption are likely to occur.
【０００６】上記の問題を解決すべく、一般的な活性炭
を使用し、この活性炭層に有機排気ガスを通気し、活性
炭により有機溶剤を吸着除去し、その後この活性炭に水
蒸気を通気し、活性炭を脱着再生し、この活性炭から有
機溶剤と水蒸気の混合ガスを取り出し、この混合ガスを
燃焼装置に通気し、有機溶剤を分解する技術が知られて
いる。この場合、活性炭の脱着再生時には、水蒸気を出
きる限り少ない量で供給し、安全な濃度範囲で出来る限
り高濃度の有機溶剤と水蒸気の混合ガスを得ることが、
省エネ的に、また、装置を小型化する上で優れることに
なる。In order to solve the above problem, a general activated carbon is used, an organic exhaust gas is passed through the activated carbon layer, an organic solvent is adsorbed and removed by the activated carbon, and then steam is passed through the activated carbon to remove the activated carbon. There is known a technique of desorbing and regenerating, extracting a mixed gas of an organic solvent and water vapor from the activated carbon, passing the mixed gas through a combustion device, and decomposing the organic solvent. In this case, at the time of desorption and regeneration of activated carbon, it is possible to supply a small amount of steam as much as possible to obtain a mixed gas of an organic solvent and steam having a concentration as high as possible within a safe concentration range.
This is excellent in energy saving and miniaturization of the device.
【０００７】しかしながら、一般の活性炭に小量の水蒸
気を供給すると、活性炭の熱容量が大きく、さらには水
蒸気の遍流が起きる等の理由で、脱着再生時に水蒸気が
凝縮し易い欠点があった。However, when a small amount of steam is supplied to a general activated carbon, there is a disadvantage that the steam easily condenses during desorption regeneration because the heat capacity of the activated carbon is large and the steam circulates.
【０００８】従って従来の一般的な活性炭を使用した技
術では、水蒸気の凝縮を防ぐために、水蒸気の供給量を
多くする、もしくは水蒸気を活性炭の上部から下降流で
供給する等の対策が必要である。Therefore, in the conventional technique using activated carbon, it is necessary to take measures such as increasing the supply amount of steam or supplying steam in a downward flow from above the activated carbon in order to prevent condensation of steam. .
【０００９】また、活性炭を小量の水蒸気で脱着再生す
る場合に起き易い水蒸気の遍流のため、活性炭を充填し
ている吸着槽に空気が残留していることがあり、この場
合空気雰囲気で活性炭が高温となり、しばし、活性炭が
発火する危険がある。特に１５０℃以下の空気雰囲気で
活性炭と酸化反応を起こす有機溶剤が含まれる場合に
は、その危険性が増大する欠点があった。従って従来の
一般的な活性炭を使用した技術では、活性炭の発火の危
険を低減するために、多くの水蒸気を供給する等の対策
が必要である。[0009] Further, due to the turbulence of water vapor which is apt to occur when the activated carbon is desorbed and regenerated with a small amount of water vapor, air sometimes remains in the adsorption tank filled with the activated carbon. There is a danger that the activated carbon will become hot and ignite for a while. Particularly, when an organic solvent that causes an oxidation reaction with activated carbon in an air atmosphere of 150 ° C. or lower is contained, there is a disadvantage that the danger increases. Therefore, in the conventional technique using activated carbon, measures such as supplying a large amount of steam are necessary in order to reduce the risk of ignition of the activated carbon.
【００１０】しかしながら、水蒸気の量が多いというこ
とはより多くのエネルギーを消費することになり、さら
には脱着された溶剤と蒸気の混合ガスを２次処理する燃
焼装置が大型化し、使用エネルギーが増大する。また、
水蒸気の供給方法、供給の流れ方向等を限定すれば、処
理装置の形が限定され、結果的に装置が大型化する等の
問題点があった。However, a large amount of water vapor consumes more energy, and furthermore, the size of the combustion device for secondary processing of the mixed gas of the solvent and the vapor desorbed increases the energy used. I do. Also,
If the method of supplying steam, the flow direction of the supply, and the like are limited, the shape of the processing apparatus is limited, and as a result, there is a problem that the apparatus is enlarged.
【００１１】[0011]
【発明が解決しようとする課題】本発明は上記のような
問題点を解決するためになされたものである。すなわ
ち、低濃度有機溶剤ガスを吸着材に通気吸着させ、小量
の加熱気体で吸着された有機溶剤を脱着し、脱着された
高濃度の有機溶剤濃縮ガスを燃焼装置で処理する低濃度
有機溶剤ガス処理に関し、エネルギーの消費量が少な
く、小型で、安全性の高い装置を設計するための、低濃
度の有機溶剤ガスの処理方法を提供するものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. That is, a low-concentration organic solvent gas is aerated and adsorbed on an adsorbent, a small amount of heated gas is used to desorb the adsorbed organic solvent, and the desorbed high-concentration organic solvent-enriched gas is treated by a combustion device. Regarding gas processing, an object of the present invention is to provide a method for processing a low-concentration organic solvent gas in order to design a small and highly safe apparatus that consumes less energy.
【００１２】本発明者は、上記の課題を解決することを
目的に、鋭意検討した結果、低濃度有機溶剤ガスを活性
炭に通気吸着させ、排気ガス中の有機溶剤を吸着した
後、水蒸気を該活性炭に通気して、該活性炭を脱着再生
する際に、活性炭として活性炭素繊維を用いた場合、活
性炭素繊維上では水蒸気の凝縮および水蒸気の遍流が起
こりにくいため、水蒸気の量が極めて小量であっても、
活性炭素繊維から有機溶剤を効率的に且つ安全に取り出
すことができることを見い出した。The inventor of the present invention has conducted intensive studies with the aim of solving the above-mentioned problems. As a result, the low-concentration organic solvent gas is adsorbed on activated carbon by aeration and the organic solvent in the exhaust gas is adsorbed. When activated carbon fibers are used as the activated carbon when the activated carbon is ventilated to desorb and regenerate the activated carbon, the amount of water vapor is extremely small because the condensation of water vapor and the turbulence of water vapor do not easily occur on the activated carbon fibers. Even
It has been found that the organic solvent can be efficiently and safely extracted from the activated carbon fiber.
【００１３】さらに、本発明者は、活性炭素繊維から取
り出される有機溶剤と水蒸気の混合ガスを空気で希釈
し、燃焼装置へ通気する際に、水蒸気の量が少なけれ
ば、有機溶剤の酸化に必要な希釈空気量を少なくするこ
とが可能となり、このため、燃焼装置で処理する溶剤ガ
スは高濃度・小風量となり、燃焼装置の使用エネルギを
低減できるだけでなく、燃焼装置を小型化することが可
能となることを見い出した。Further, the present inventor has proposed that when a mixed gas of an organic solvent and water vapor taken out from activated carbon fibers is diluted with air and passed to a combustion device, if the amount of water vapor is small, it is necessary to oxidize the organic solvent. It is possible to reduce the amount of dilution air, and the solvent gas to be processed in the combustion device has a high concentration and small air volume, which not only reduces the energy consumption of the combustion device but also allows the combustion device to be downsized. And found that
【００１４】本発明者らは、上記の知見を基に、さらに
重ねて検討した結果本発明に到達したものである。The present inventors have made further studies based on the above findings and arrived at the present invention.
【００１５】[0015]
【課題を解決するための手段】即ち、本発明は、低濃度
の有機溶剤を含有する排気ガスを、吸着エレメントに通
気し、排気ガス中の有機溶剤を吸着させた後、前記吸着
エレメントに水蒸気を通気し、前記吸着エレメントに吸
着された有機溶剤を脱着し、その後、脱着された有機溶
剤と水蒸気の混合ガスを空気で希釈したガスを燃焼装置
に通気し、有機溶剤を酸化分解処理する排気ガス処理方
法において、前記吸着エレメントの吸着材が活性炭素繊
維である排気ガス処理方法を提供するものである。That is, according to the present invention, an exhaust gas containing a low-concentration organic solvent is passed through an adsorption element to adsorb the organic solvent in the exhaust gas. To desorb the organic solvent adsorbed on the adsorbing element. Then, a gas obtained by diluting a mixed gas of the desorbed organic solvent and water vapor with air is passed through a combustion device to exhaust gas for oxidatively decomposing the organic solvent. In the gas treatment method, the present invention provides an exhaust gas treatment method in which the adsorbent of the adsorption element is activated carbon fiber.
【００１６】本発明の排気ガス処理方法の好ましい実施
態様は、前記活性炭素繊維の繊維径が、１０〜３０ミク
ロンである。In a preferred embodiment of the exhaust gas treatment method according to the present invention, the activated carbon fibers have a fiber diameter of 10 to 30 microns.
【００１７】本発明の排気ガス処理方法の好ましい実施
態様は、前記吸着エレメントの吸着材が、活性炭素繊維
からなる不織布マットの積層体である。In a preferred embodiment of the exhaust gas treatment method of the present invention, the adsorbent of the adsorption element is a laminate of a nonwoven fabric mat made of activated carbon fibers.
【００１８】本発明の排気ガス処理方法の好ましい実施
態様は、前記有機溶剤が、１５０℃以下の空気雰囲気に
て活性炭素繊維と酸化反応する有機溶剤を含むものであ
る。In a preferred embodiment of the exhaust gas treatment method according to the present invention, the organic solvent contains an organic solvent that undergoes an oxidation reaction with activated carbon fibers in an air atmosphere at 150 ° C. or lower.
【００１９】また、本発明は、排気ガス中の有機溶剤を
吸着する吸着エレメントを内蔵した吸着手段、吸着手段
に排気ガスを供給する排気ガス供給手段、吸着された有
機溶剤を脱着するために吸着手段に水蒸気を供給する水
蒸気供給手段、脱着された有機溶剤と水蒸気の混合ガス
に空気を供給する空気供給手段、空気により希釈された
混合ガス中の有機溶剤を酸化分解する燃焼手段を備えて
なる排気ガス処理装置において、前記吸着エレメントの
吸着材が活性炭素繊維である排気ガス処理装置を提供す
るものである。Also, the present invention provides an adsorbing means having a built-in adsorbing element for adsorbing an organic solvent in exhaust gas, an exhaust gas supplying means for supplying exhaust gas to the adsorbing means, and an adsorbing means for desorbing the adsorbed organic solvent. A steam supply means for supplying steam to the means, an air supply means for supplying air to a mixed gas of the desorbed organic solvent and steam, and a combustion means for oxidatively decomposing the organic solvent in the mixed gas diluted with air. The present invention provides an exhaust gas treatment device, wherein the adsorbent of the adsorption element is activated carbon fiber.
【００２０】本発明の排気ガス処理装置の好ましい実施
態様は、前記活性単繊維の繊維径が、１０〜３０ミクロ
ンである。In a preferred embodiment of the exhaust gas treating apparatus according to the present invention, the activated single fiber has a fiber diameter of 10 to 30 microns.
【００２１】本発明の排気ガス処理装置の好ましい実施
態様は、前記吸着エレメントが、活性炭素繊維からなる
不織布マットの積層体である。In a preferred embodiment of the exhaust gas treatment apparatus according to the present invention, the adsorption element is a laminate of a nonwoven fabric mat made of activated carbon fibers.
【００２２】本発明の排気ガス処理装置の好ましい実施
態様は、前記吸着エレメントが、中心孔を有する有孔フ
ランジと無孔フランジとの間に固着されこの中心孔とほ
ぼ同じ直径を有する筒状かご型の巻心に活性炭素繊維不
織布マットを層状に巻き付けてなるものである。In a preferred embodiment of the exhaust gas treating apparatus according to the present invention, the adsorbing element is fixed between a perforated flange having a center hole and a non-perforated flange and has a cylindrical cage having substantially the same diameter as the center hole. Activated carbon fiber nonwoven fabric mat is wound in layers around the core of the mold.
【００２３】本発明の排気ガス処理装置の好ましい実施
態様は、吸着及び脱着（再生）を繰り返し行うために、
前記吸着槽を複数有してなるものである。In a preferred embodiment of the exhaust gas treatment apparatus of the present invention, in order to repeatedly perform adsorption and desorption (regeneration),
It has a plurality of the adsorption tanks.
【００２４】本発明の排気ガス処理装置の好ましい実施
態様は、脱着された有機溶剤と水蒸気の混合ガスを空気
で希釈した際に生じる水蒸気の凝縮を防ぐための加熱手
段を有するA preferred embodiment of the exhaust gas treatment apparatus of the present invention has a heating means for preventing condensation of water vapor generated when a mixed gas of a desorbed organic solvent and water vapor is diluted with air.
【００２５】本発明の排気ガス処理装置の好ましい実施
態様は、脱着された有機溶剤と水蒸気の混合ガスを冷却
凝縮して回収する手段を有する。A preferred embodiment of the exhaust gas treatment apparatus of the present invention has means for cooling and condensing and recovering the mixed gas of the desorbed organic solvent and water vapor.
【００２６】[0026]
【発明の実施の形態】以下、図を用いて本発明を詳細に
説明する。図１は、本発明の処理方法又は処理装置をフ
ローが示したものである。低濃度有機溶剤含有排気ガス
は、ファン１ａおよびダンパー２ａを介して活性炭素繊
維不織布マット積層体を装着した吸着槽３ａに通気さ
れ、低濃度有機溶剤排気ガスは吸着浄化され、ダンパ２
ｃを介して外部へ排出される。他方吸着槽３ｂにはバル
ブ２ｈを介して水蒸気が供給され、活性炭素繊維不織布
マット積層体から吸気溶剤と水蒸気の混合ガスがバルブ
２ｆを介して取り出される。この混合ガスは、希釈用空
気とチャンバー５で混合されファン１ｂを介して触媒燃
焼装置４に送られる。有機溶剤は触媒装置に装着された
触媒６により酸化分解し無害化され、外部へ放出され
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 shows a flow of the processing method or processing apparatus of the present invention. The low-concentration organic solvent-containing exhaust gas is passed through a fan 1a and a damper 2a to an adsorption tank 3a equipped with an activated carbon fiber nonwoven fabric mat laminate, and the low-concentration organic solvent exhaust gas is adsorbed and purified, and the damper 2 is removed.
and discharged to the outside via c. On the other hand, steam is supplied to the adsorption tank 3b via a valve 2h, and a mixed gas of an intake solvent and steam is extracted from the activated carbon fiber nonwoven fabric mat laminate via a valve 2f. This mixed gas is mixed with the dilution air in the chamber 5 and sent to the catalytic combustion device 4 via the fan 1b. The organic solvent is oxidized and decomposed by the catalyst 6 mounted on the catalyst device, rendered harmless, and released to the outside.
【００２７】なお、上記において、混合ガス中の水蒸気
の凝縮を防ぐために、混合ガスを空気で希釈する前に、
ファン１ｃから送られた空気を、ヒーター８で予め加熱
するのが好ましい。In the above, in order to prevent condensation of water vapor in the mixed gas, before diluting the mixed gas with air,
It is preferable that the air sent from the fan 1c be heated by the heater 8 in advance.
【００２８】また、上記において、触媒燃焼装置が故障
した際のバックアップとして、溶剤と水蒸気との混合ガ
スを冷却凝縮させるコンデンサー９と凝縮液を溜めるタ
ンク１０が付設し、必要時にバルブ２ｊを閉め、バルブ
２ｉを開けて混合ガスを燃焼装置に供給せずに凝縮器で
凝縮回収する構造とするのが好ましい。なお、配管１１
は混合ガスの凝縮液をタンク１０へ供給する配管であ
る。In the above, a condenser 9 for cooling and condensing the mixed gas of the solvent and the steam and a tank 10 for storing the condensed liquid are provided as a backup when the catalytic combustion device fails, and the valve 2j is closed when necessary. It is preferable to adopt a structure in which the mixed gas is condensed and recovered by a condenser without opening the valve 2i to supply the mixed gas to the combustion device. The pipe 11
Is a pipe for supplying a condensate of the mixed gas to the tank 10.
【００２９】本発明に用いられる活性炭素繊維の繊維径
（直径）は、１０〜３０ミクロンであることが好まし
く、１０〜２０ミクロンであればより好ましい。活性炭
素繊維の繊維径が１０ミクロン未満の場合には、通気抵
抗が大きくなり、実用上の処理に問題が生じ、活性炭素
繊維の繊維径が３０ミクロンを越える場合には、吸着・
脱着速度が遅くなる。The fiber diameter (diameter) of the activated carbon fiber used in the present invention is preferably 10 to 30 microns, more preferably 10 to 20 microns. When the fiber diameter of the activated carbon fiber is less than 10 microns, the airflow resistance becomes large, and there is a problem in practical treatment.
The desorption speed becomes slow.
【００３０】本発明に用いられる吸着エレメントは、活
性炭素繊維からなる不織布マットの積層体であれば好ま
しい。活性炭素繊維不織布マットは、極めて通気ガスの
接触面積が大きく、通気性が均一で、水蒸気の凝縮・遍
流が最も起こりにくい活性炭素繊維の集合体である。ま
た、活性炭素繊維不織布マットは、極めて吸着脱着速度
が早く、排気ガスの吸着除去性能が極めて高い。The adsorption element used in the present invention is preferably a laminate of a nonwoven fabric mat made of activated carbon fibers. The activated carbon fiber nonwoven fabric mat is an aggregate of activated carbon fibers having an extremely large area of contact with a ventilation gas, uniform air permeability, and in which condensation and turbulence of water vapor hardly occur. Further, the activated carbon fiber nonwoven fabric mat has an extremely fast adsorption / desorption speed and an extremely high exhaust gas adsorption / removal performance.
【００３１】本発明に用いられる吸着エレメントは、中
心孔を有する有孔フランジと無孔フランジとの間に固着
され上記中心孔とほぼ同じ直径を有する筒状かご形の巻
心を有する図２のエレメントに活性炭素繊維不織布マッ
トを巻き付け積層体すなわち図３の様な円筒吸着エレメ
ントとすることが好ましい。このような吸着エレメント
を使用して本処理を行った場合、活性炭素繊維と金属部
の接触面積が極めて少なく、金属部での水蒸気の凝縮が
極力抑えられるため、水蒸気の供給量をさらに少なくす
ることが可能となる。The suction element used in the present invention has a cylindrical basket-shaped core wound between a perforated flange having a center hole and a non-perforated flange and having a diameter substantially equal to that of the center hole. It is preferable that an activated carbon fiber nonwoven fabric mat is wound around the element to form a laminate, that is, a cylindrical adsorption element as shown in FIG. When this treatment is performed using such an adsorption element, the contact area between the activated carbon fiber and the metal part is extremely small, and the condensation of water vapor in the metal part is suppressed as much as possible, so that the supply amount of water vapor is further reduced. It becomes possible.
【００３２】本発明の排気ガス処理装置は、吸着・再生
を繰り返し行うために、吸着槽を複数有してなることが
好ましい。かような複数の吸着槽を有した排気ガス処理
装置、例えば、図１のフローシートに示される固定床方
式吸着装置にて低濃度有機溶剤排気ガスの処理を行う場
合には、脱着再生時に活性炭素繊維から取り出される有
機溶剤の量は経時的に変化するので、活性炭素繊維の脱
着再生時に供給される水蒸気の量を、その脱着される有
機溶剤の量に応じて任意に変化させることにより、より
定常的な濃度にて有機溶剤を活性炭素繊維より取り出す
ことが可能となるのである。The exhaust gas treatment apparatus of the present invention preferably has a plurality of adsorption tanks in order to repeatedly perform adsorption and regeneration. When a low-concentration organic solvent exhaust gas is treated by such an exhaust gas treatment apparatus having a plurality of adsorption tanks, for example, a fixed bed adsorption apparatus shown in the flow sheet of FIG. Since the amount of the organic solvent taken out of the carbon fiber changes over time, by arbitrarily changing the amount of water vapor supplied during desorption and regeneration of the activated carbon fiber according to the amount of the desorbed organic solvent, The organic solvent can be extracted from the activated carbon fiber at a more constant concentration.
【００３３】本発明の排気ガス処理方法において、被処
理の対象である排気ガス中の有機溶剤は、１５０℃以下
の空気雰囲気にて活性炭素繊維と酸化反応する有機溶剤
であることが好ましい。上記の溶剤は、特に限定される
ものではないが、例えば、メチルエチルケトン、メチル
ブチルケトン、シクロヘキサノン、イソホロン、等のケ
トン類の一部、さらにモノエタノールアミン等のアミン
類の一部、さらにはイソブチルアルデヒド等のアルデヒ
ド類の一部などが挙げられる。In the exhaust gas treatment method of the present invention, the organic solvent in the exhaust gas to be treated is preferably an organic solvent that undergoes an oxidation reaction with activated carbon fibers in an air atmosphere at 150 ° C. or lower. The solvent is not particularly limited, for example, a part of ketones such as methyl ethyl ketone, methyl butyl ketone, cyclohexanone, isophorone, a part of amines such as monoethanolamine, further isobutyl aldehyde And some of the aldehydes.
【００３４】[0034]
【実施例１】図１のフローシートに従った処理装置を用
いた。まず、活性炭素繊維不織布マットを図２に示すエ
レメントへ積層体となるように巻き付けて図３に示す円
筒吸着エレメントとし、これらを吸着槽に装着した。こ
の時の各槽の活性炭素繊維の重量は約１０ｋｇであっ
た。この処理装置の一方の吸着槽に、約２０ｐｐｍのイ
ソプロパノールを主体とした有機溶剤排気ガス２０m ３
/minを円筒吸着エレメントの外側から内側に向けて通気
した。排気ガス中の有機溶剤は９９％以上吸着除去され
大気へ放出された。他方の吸着槽には１５０g/min と極
めて小量の水蒸気が円筒吸着エレメントの内側から外側
へ供給され、活性炭素繊維不織布マットに吸着された有
機溶剤は脱着され、水蒸気と有機溶剤の混合ガスとして
取り出された。この混合ガスに約７０℃に加熱された空
気０．３m ３/minを加え希釈して、約０．５m ３/minの
ガスとして触媒燃焼装置に供給した。燃焼装置には白金
触媒が充填されており、触媒処理温度は３５０℃であっ
た。この時、触媒燃焼装置に供給される混合ガスの風量
は、原ガスすなわち低濃度有機排気処理ガスの約４０分
の１と極めて少ない風量であった。また触媒燃焼装置に
よって有機溶剤は９９％酸化除去され、大気へ放出され
た。Example 1 A processing apparatus according to the flow sheet of FIG. 1 was used. First, an activated carbon fiber nonwoven fabric mat was wound around the element shown in FIG. 2 so as to form a laminate, and the cylindrical adsorption element shown in FIG. 3 was attached to an adsorption tank. At this time, the weight of the activated carbon fiber in each tank was about 10 kg. 20 m 3 of an organic solvent exhaust gas mainly containing about 20 ppm of isopropanol was placed in one of the adsorption tanks of this processing apparatus.
/ min was ventilated from outside to inside of the cylindrical adsorption element. 99% or more of the organic solvent in the exhaust gas was adsorbed and removed and released to the atmosphere. A very small amount of water vapor, 150 g / min, is supplied from the inside to the outside of the cylindrical adsorption element to the other adsorption tank, and the organic solvent adsorbed on the activated carbon fiber nonwoven fabric mat is desorbed, resulting in a mixed gas of water vapor and the organic solvent. Was taken out. The mixed gas was diluted by adding 0.3 m 3 / min of air heated to about 70 ° C., and supplied as a gas of about 0.5 m 3 / min to the catalytic combustion device. The combustion device was filled with a platinum catalyst, and the catalyst treatment temperature was 350 ° C. At this time, the air volume of the mixed gas supplied to the catalytic combustion device was extremely small, approximately 1/40 that of the raw gas, that is, the low-concentration organic exhaust gas. The organic solvent was oxidized and removed 99% by the catalytic combustion device and released to the atmosphere.
【００３５】[0035]
【実施例２】１５０℃以下の空気雰囲気で活性炭素繊維
と酸化反応を示す有機溶剤であるモノエタノールアミン
とケトン系溶剤を含む約２０ｐｐｍの低濃度有機溶剤排
気ガスを実施例１と同様な方法で処理を行った。この時
の低濃度有機溶剤排気ガスの風量は実施例同様２０m ３
/minであった。さらに実施例１と同様１５０g/min と極
めて少ない水蒸気で活性炭素繊維を脱着再生し、取り出
された水蒸気と有機溶剤の混合ガスに７０℃に加熱され
た空気０．３m ３/minを加え希釈し、約０．５m ３/min
のガスとして触媒燃焼装置に供給した。燃焼装置には白
金触媒が充填されており、触媒処理温度は３５０℃であ
った。この時、活性炭素繊維には発熱等の異常は見られ
ず、活性炭素繊維での吸着除去性能は９９％以上、触媒
燃焼装置の酸化分解性能も９９％以上と、極めて良好な
処理性能を示した。Example 2 A method similar to that of Example 1 was carried out by using a low-concentration organic solvent exhaust gas of about 20 ppm containing monoethanolamine and a ketone-based solvent, which are organic solvents showing an oxidation reaction with activated carbon fibers in an air atmosphere of 150 ° C. or less. Was performed. At this time, the flow rate of the low-concentration organic solvent exhaust gas was 20 m 3 as in the embodiment.
/ min. Further, the activated carbon fibers were desorbed and regenerated with a very small amount of water vapor of 150 g / min as in Example 1, and 0.3 m 3 / min of air heated to 70 ° C. was added to the mixed gas of the water vapor and the organic solvent taken out for dilution. , About 0.5m3 / min
Was supplied to the catalytic combustion device as a gas. The combustion device was filled with a platinum catalyst, and the catalyst treatment temperature was 350 ° C. At this time, no abnormalities such as heat generation were observed in the activated carbon fiber, and the adsorption and removal performance of the activated carbon fiber was 99% or more, and the oxidative decomposition performance of the catalytic combustion device was 99% or more, showing extremely good processing performance. Was.
【００３６】[0036]
【発明の効果】本方法を用いた処理装置により、低濃度
の有機溶剤含有排気ガスは活性炭素繊維不織布マット積
層体に通気され、９９％以上の除去率で浄化された。ま
た活性炭素繊維から水蒸気による脱着で取り出された有
機溶剤と水蒸気の混合ガスは、空気で希釈され触媒燃焼
装置へ供給された。触媒燃焼装置による有機溶剤の分解
率は９９％以上であった。また触媒燃焼装置への供給風
量は原ガス（低濃度有機溶剤含有排気ガス）のわずか1/
40であり、触媒燃焼装置の使用エネルギーが少なく、極
めて小型な装置となった。さらに本方式を用いた処理装
置は、活性炭素繊維と空気雰囲気で反応性のある有機溶
剤を含んでいる排気ガスについても、何ら問題なく処理
し、その除去性能は極めて高い値を示した。According to the processing apparatus using the present method, the exhaust gas containing a low concentration of the organic solvent is passed through the activated carbon fiber nonwoven fabric mat laminate and purified with a removal rate of 99% or more. Further, the mixed gas of the organic solvent and water vapor taken out of the activated carbon fiber by desorption with water vapor was diluted with air and supplied to the catalytic combustion device. The decomposition rate of the organic solvent by the catalytic combustion device was 99% or more. Also, the amount of air supplied to the catalytic combustion device is only 1/1
It is 40, which is a very compact device that uses less energy from the catalytic combustion device. Furthermore, the processing apparatus using this method also processed the exhaust gas containing the organic solvent reactive with the activated carbon fiber in the air atmosphere without any problem, and showed extremely high removal performance.
【図１】 本発明を使用した処理装置フローの１例FIG. 1 shows an example of a processing apparatus flow using the present invention.
【図２】 本発明で使用される活性炭素繊維未装着の円
筒エレメント外観図の１例FIG. 2 is an example of an external view of a cylindrical element without an activated carbon fiber used in the present invention.
【図３】 本発明で使用される活性炭素繊維不織布マッ
ト積層体を装着した円筒吸着エレメント外観図の１例FIG. 3 is an example of an external view of a cylindrical adsorption element equipped with an activated carbon fiber nonwoven fabric mat laminate used in the present invention.
【図４】 図３の断面図FIG. 4 is a sectional view of FIG. 3;
【図５】 従来使用される連続回転型吸着濃縮装置の概
略図FIG. 5 is a schematic view of a conventional continuous rotary adsorption / concentration apparatus.
１ ファン ２ バルブ ３ 活性炭素繊維不織布マット積層体充填吸着槽 ４ 触媒燃焼装置 ５ チャンバー ６ 触媒ヒーター ７ 触媒 ８ ヒーター ９ 凝縮器 １０ 回収タンク １１ 凝縮液排出配管 １２ 有孔フランジ １３ 無孔フランジ １４ 筒状かご型巻心 １５ 活性炭素繊維不織布マット積層体 DESCRIPTION OF SYMBOLS 1 Fan 2 Valve 3 Adsorption tank filled with activated carbon fiber nonwoven fabric mat laminate 4 Catalytic combustion device 5 Chamber 6 Catalyst heater 7 Catalyst 8 Heater 9 Condenser 10 Recovery tank 11 Condensate discharge pipe 12 Perforated flange 13 Non-perforated flange 14 Cylindrical Cage type core 15 Activated carbon fiber non-woven mat laminate
Claims (11)
を、吸着エレメントに通気し、排気ガス中の有機溶剤を
吸着させた後、前記吸着エレメントに水蒸気を通気し、
前記吸着エレメントに吸着された有機溶剤を脱着し、そ
の後、脱着された有機溶剤と水蒸気の混合ガスを空気で
希釈したガスを燃焼装置に通気し、有機溶剤を酸化分解
処理する有機溶剤ガスの処理方法において、前記吸着エ
レメントの吸着材が活性炭素繊維であることを特徴とす
る有機溶剤ガスの処理方法。1. An exhaust gas containing a low-concentration organic solvent is passed through an adsorption element, and after adsorbing the organic solvent in the exhaust gas, steam is passed through the adsorption element.
The organic solvent adsorbed on the adsorption element is desorbed, and then, a gas obtained by diluting a mixed gas of the desorbed organic solvent and water vapor with air is passed through a combustion device to oxidatively decompose the organic solvent. The method for treating an organic solvent gas, wherein the adsorbent of the adsorption element is activated carbon fiber.
０ミクロンであることを特徴とする請求項１に記載の有
機溶剤ガスの処理方法。2. The activated carbon fiber has a fiber diameter of 10-3.
The method for treating an organic solvent gas according to claim 1, wherein the diameter is 0 micron.
らなる不織布マットの積層体であることを特徴とする請
求項１又は２に記載の低濃度有機溶剤ガスの処理方法。3. The method for treating a low-concentration organic solvent gas according to claim 1, wherein the adsorption element is a laminate of a nonwoven fabric mat made of activated carbon fibers.
囲気にて活性炭素繊維と酸化反応する有機溶剤を含むこ
とを特徴とする請求項１乃至３に記載の低濃度有機溶剤
ガスの処理方法。4. The method for treating a low-concentration organic solvent gas according to claim 1, wherein the organic solvent contains an organic solvent that undergoes an oxidation reaction with activated carbon fibers in an air atmosphere at 150 ° C. or lower. .
レメントを内蔵した吸着手段、吸着手段に排気ガスを供
給する排気ガス供給手段、吸着された有機溶剤を脱着す
るために吸着手段に水蒸気を供給する水蒸気供給手段、
脱着された有機溶剤と水蒸気の混合ガスに空気を供給す
る空気供給手段、空気により希釈された混合ガス中の有
機溶剤を酸化分解する燃焼手段を備えてなる排気ガス処
理装置において、前記吸着エレメントの吸着材が活性炭
素繊維であることを特徴とする排気ガス処理装置。5. An adsorbing means having a built-in adsorbing element for adsorbing an organic solvent in exhaust gas, an exhaust gas supplying means for supplying exhaust gas to the adsorbing means, and a means for supplying water vapor to the adsorbing means for desorbing the adsorbed organic solvent. Means for supplying steam,
An air supply means for supplying air to a mixed gas of the desorbed organic solvent and water vapor, and an exhaust gas treatment device comprising a combustion means for oxidatively decomposing the organic solvent in the mixed gas diluted with air; An exhaust gas treatment device, wherein the adsorbent is activated carbon fiber.
ミクロンであることを特徴とする請求項５に記載の排気
ガス処理装置。6. The fiber diameter of the active single fiber is 10 to 30.
The exhaust gas treatment apparatus according to claim 5, wherein the diameter is in microns.
らなる不織布マットの積層体であることを特徴とする請
求項５又は６に記載の排気ガス処理装置。7. The exhaust gas treatment device according to claim 5, wherein the adsorption element is a laminate of a nonwoven fabric mat made of activated carbon fibers.
有孔フランジと無孔フランジとの間に固着されこの中心
孔とほぼ同じ直径を有する筒状かご型の巻心に活性炭素
繊維不織布マットを層状に巻き付けてなることを特徴と
する請求項５乃至７に記載の排気ガス処理装置。8. The activated carbon fiber nonwoven fabric mat is fixed to a cylindrical cage core having a diameter substantially equal to that of the center hole, wherein the adsorption element is fixed between a perforated flange having a center hole and a non-perforated flange. The exhaust gas treatment device according to claim 5, wherein the exhaust gas treatment device is wound in layers.
めに、前記吸着槽を複数有してなることを特徴とする請
求項５〜８に記載の排気ガス処理装置。9. The exhaust gas treatment apparatus according to claim 5, wherein a plurality of said adsorption tanks are provided to repeatedly perform adsorption and desorption (regeneration).
スを空気で希釈した際に生じる水蒸気の凝縮を防ぐため
の加熱手段を有することを特徴とする請求項５乃至９に
記載の排気ガス処理装置。10. The exhaust gas treatment according to claim 5, further comprising heating means for preventing condensation of water vapor generated when a mixed gas of the desorbed organic solvent and water vapor is diluted with air. apparatus.
スを冷却凝縮して回収する手段を有することを特徴とす
る請求項５乃至１０に記載の排気ガス処理装置。11. The exhaust gas treatment apparatus according to claim 5, further comprising means for cooling, condensing, and recovering the mixed gas of the desorbed organic solvent and water vapor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10165217A JP2000000425A (en) | 1998-06-12 | 1998-06-12 | Treatment of low-concentration gaseous organic solvent and its treatment apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10165217A JP2000000425A (en) | 1998-06-12 | 1998-06-12 | Treatment of low-concentration gaseous organic solvent and its treatment apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000000425A true JP2000000425A (en) | 2000-01-07 |
Family
ID=15808084
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10165217A Pending JP2000000425A (en) | 1998-06-12 | 1998-06-12 | Treatment of low-concentration gaseous organic solvent and its treatment apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000000425A (en) |
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