JP2009034268A - Aldehyde removing chemical filter - Google Patents
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本発明は、家庭環境や作業環境から発生するアルデヒド類、特にアセトアルデヒド及びホルムアルデヒドの吸着除去に使用されるアルデヒド除去用ケミカルフィルタに関する。 The present invention relates to a chemical filter for removing aldehydes used for adsorption removal of aldehydes generated from a home environment or a work environment, particularly acetaldehyde and formaldehyde.
従来から、家庭環境や作業環境から発生するアルデヒド類の吸着除去に使用されるアルデヒド除去用ケミカルフィルタとして、活性炭等の多孔質吸着剤があった。ところが、こうした吸着剤自体はアセトアルデヒドやホルムアルデヒド等の低級アルデヒド類の吸着能が低く、相当量の吸着剤を使用しなければならないという問題があったため、低級アルデヒド類の吸着能が高く、かつ、経時安定性が良好で健康上の有害性のないものとして、分子中に尿素結合を有する尿素化合物（例えばエチレン尿素（２−イミダゾリジノン)）を活性炭等の多孔質担体に添着したものが提案されている（特許文献１参照）。また、他のアルデヒド除去用ケミカルフィルタとして、モルホリン等の環状飽和第二アミンと、硫酸、リン酸、ホウ酸等の無機酸やシュウ酸、クエン酸等の有機酸からなる不揮発性酸、尿素及びチオ尿素から選ばれた少なくとも１種とを活性炭等の多孔質担体に担持せしめたものが提案されている（特許文献２参照）。 Conventionally, porous adsorbents such as activated carbon have been used as chemical filters for removing aldehydes used for adsorption removal of aldehydes generated in the home environment and work environment. However, these adsorbents themselves have a low adsorbing ability for lower aldehydes such as acetaldehyde and formaldehyde, and there is a problem that a considerable amount of adsorbent must be used. As one having good stability and no health hazard, a urea compound having a urea bond in the molecule (for example, ethylene urea (2-imidazolidinone)) attached to a porous carrier such as activated carbon has been proposed. (See Patent Document 1). In addition, as other chemical filters for aldehyde removal, non-volatile acids composed of cyclic saturated secondary amines such as morpholine, inorganic acids such as sulfuric acid, phosphoric acid and boric acid, and organic acids such as oxalic acid and citric acid, urea and A material in which at least one selected from thiourea is supported on a porous carrier such as activated carbon has been proposed (see Patent Document 2).
ところで、厚生省による平成１２年６月３０日付生衛発第１０９３号生活衛生局長通知及び平成１２年１２月２２日付生衛発第１８５２号生活衛生局長通知、並びに、厚生労働省による平成１３年７月２５日付医薬発第８２８号医薬局長通知により、シックハウス等の室内汚染の根源であるホルムアルデヒドについて、毒性指標を「ヒト吸入暴露における鼻咽頭粘膜への刺激」として「１００μｇ／ｍ３（０．０８ｐｐｍ）」の室内濃度指針値が通知された。また、厚生労働省による平成１４年２月７日付医薬発第０２０７００２号医薬局長通知により、室内汚染の根源であるアセトアルデヒドについて、毒性指標を「ラットの経気道暴露における鼻腔嗅覚上皮への影響」として「４８μｇ／ｍ３（０．０３ｐｐｍ）」の室内濃度指針値が通知された。 By the way, the Ministry of Health and Welfare issued a notice of the No. 1093 Life Sanitation Bureau from June 30, 2000, the Director of the No. 1852 Life and Sanitation Bureau from December 22, 2000, and the Ministry of Health, Labor and Welfare in July 2001. According to the notification from the Pharmaceutical Director General of Drug No. 828 dated 25th, formaldehyde, which is the source of indoor contamination such as sick house, has a toxicity index of “100 μg / m 3 (0.08 ppm) as“ irritation to nasopharyngeal mucosa in human inhalation exposure ” ”Was reported. In addition, the Ministry of Health, Labor and Welfare notified the Director of Pharmacy No. 0207002, dated February 7, 2002, that the toxicity index of acetaldehyde, which is the source of indoor contamination, is "influence on the nasal olfactory epithelium in the respiratory tract exposure of rats" The indoor concentration guideline value of “48 μg / m 3 (0.03 ppm)” was notified.
しかしながら、低級アルデヒド類であるアセトアルデヒド及びホルムアルデヒドが室内に高濃度で共存した場合に、上記室内濃度指針値を十分にクリアするアルデヒド除去用ケミカルフィルタは提案されていなかった。
本発明は、上記の事情に鑑みて為されたもので、アセトアルデヒド及びホルムアルデヒドが室内に共存した場合に両アルデヒドについて室内濃度指針値を満たすアルデヒド除去用ケミカルフィルタを提供することを課題としている。 This invention is made | formed in view of said situation, and when acetaldehyde and formaldehyde coexist in a room | chamber interior, it is made into the subject to provide the chemical filter for aldehyde removal which satisfy | fills the indoor concentration guideline value about both aldehydes.
上記課題を解決するため、請求項１に係る発明は、モルホリンを添着した活性炭とエチレン尿素(２−イミダゾリジノン)を添着した活性炭との混合物を含むアルデヒド除去用ケミカルフィルタを特徴とする。 In order to solve the above-mentioned problems, the invention according to claim 1 is characterized by an aldehyde removing chemical filter comprising a mixture of activated carbon impregnated with morpholine and activated carbon impregnated with ethylene urea (2-imidazolidinone).
請求項１に係る発明によれば、モルホリンを添着した活性炭にアセトアルデヒドが物理吸着した後にモルホリンと反応して化学吸着し、アセトアルデヒド濃度の低減が図られるとともに、エチレン尿素を添着した活性炭にホルムアルデヒドが物理吸着した後にエチレン尿素と反応して化学吸着し、ホルムアルデヒド濃度の低減が図られる。これにより、アセトアルデヒド及びホルムアルデヒドが室内に共存した場合に両アルデヒドについて室内濃度指針値を容易に満たすことができる。 According to the first aspect of the invention, acetaldehyde is physically adsorbed on activated carbon impregnated with morpholine and then chemically adsorbed by reacting with morpholine to reduce the acetaldehyde concentration, and formaldehyde is physically adsorbed on activated carbon impregnated with ethylene urea. After the adsorption, it reacts with ethylene urea and chemisorbs to reduce the formaldehyde concentration. Thereby, when acetaldehyde and formaldehyde coexist in the room, the indoor concentration guideline value can be easily satisfied for both aldehydes.
請求項２に係る発明は、請求項１に記載のアルデヒド除去用ケミカルフィルタにおいて、前記モルホリンを添着した活性炭（モルホリン添着活性炭）の質量を前記エチレン尿素を添着した活性炭（エチレン尿素添着活性炭）の質量で除した配合比が１／２よりも大きく１以下であることを特徴とする。 The invention according to claim 2 is the chemical filter for aldehyde removal according to claim 1, wherein the mass of the activated carbon (morpholine-added activated carbon) impregnated with morpholine is the mass of the activated carbon (ethylene urea-added activated carbon) impregnated with ethylene urea. The compounding ratio divided by 1 is greater than 1/2 and 1 or less.
請求項２に係る発明によれば、モルホリン添着活性炭とエチレン尿素添着活性炭との配合比が１／２＜モルホリン添着活性炭量／エチレン尿素添着活性炭量≦１であることにより、アセトアルデヒド及びホルムアルデヒドの双方についての除去効率を長期にわたって高く維持してフィルタ寿命を長くすることができる。 According to the invention according to claim 2, when the blending ratio of the morpholine-added activated carbon and the ethylene urea-added activated carbon is 1/2 <the amount of morpholine-attached activated carbon / the amount of ethylene urea-added activated carbon ≦ 1, both acetaldehyde and formaldehyde The removal efficiency of the filter can be maintained high over a long period of time, thereby extending the filter life.
本発明に係るアルデヒド除去用ケミカルフィルタによれば、アセトアルデヒド及びホルムアルデヒドが室内に共存した場合に両アルデヒドについて室内濃度指針値を容易に満たすことができる。 According to the chemical filter for aldehyde removal according to the present invention, when acetaldehyde and formaldehyde coexist in the room, the indoor concentration guideline value can be easily satisfied for both aldehydes.
本発明を実施するための最良の形態について説明する。 The best mode for carrying out the present invention will be described.
本形態に係るアルデヒド除去用ケミカルフィルタは、モルホリンを添着した活性炭とエチレン尿素(２−イミダゾリジノン)を添着した活性炭との混合物を主として構成される。ここで用いられる活性炭は、液体窒素温度条件下の窒素吸着によるＢＥＴ表面積が３５０〜３,５００ｍ２／ｇ、好ましくは５００〜３，０００ｍ２／ｇのものである。 The chemical filter for aldehyde removal according to the present embodiment is mainly composed of a mixture of activated carbon impregnated with morpholine and activated carbon impregnated with ethylene urea (2-imidazolidinone). Activated carbon, as used herein, BET surface area by nitrogen adsorption of liquid nitrogen temperature conditions 350~3,500m 2 / g, preferably at the 500~3,000m 2 / g.
モルホリン、エチレン尿素といった添着剤を活性炭に担持させるには、それらの物質が水に可溶であるか否かに応じて適切な方法が採られる。つまり、添着剤が水に可溶な物質の場合には、添着剤を予め水に溶解させて活性炭をこの水溶液に浸漬させた後に濾別する方法、活性炭を撹拌混合しながら添着剤の水溶液を噴霧又は散布する方法、粉末状の活性炭と添着剤の水溶液とを混合し、必要に応じてバインダを添加して造粒、成型する方法を採ることができる。一方、添着剤が水に不溶な物質の場合には、粉末状の活性炭と粉末状の添着剤とを物理的に混合する方法、粉末状の活性炭と粉末状の添着剤とを予め混合しておき、水、バインダを加えて造粒、成型する方法、水に添着剤及びバインダを加えて予めスラリーを調製し、このスラリーを活性炭に噴霧又は散布する方法を採ることができる。複数種の添着剤はいずれかを先に多孔質担体に担持させてもよく、同時に担持させてもかまわない。また、こうした担持方法において、必要に応じて用いられるバインダとしては種々の公知のもの（例えばカルボキシメチルセルロース、ポリビニルアルコール、アラビヤゴム）があり、その使用量は少ないほど望ましい。 In order to support activated carbon such as morpholine and ethylene urea on the activated carbon, an appropriate method is adopted depending on whether or not these substances are soluble in water. That is, when the additive is a water-soluble substance, the additive is dissolved in water in advance and the activated carbon is immersed in this aqueous solution, followed by filtration. The aqueous solution of the additive is stirred and mixed with the activated carbon. A method of spraying or spraying, a method of mixing powdered activated carbon and an aqueous solution of an additive, adding a binder as necessary, and granulating and molding can be employed. On the other hand, when the additive is a substance insoluble in water, a method of physically mixing the powdered activated carbon and the powdered additive, the powdered activated carbon and the powdered additive are mixed in advance. In addition, it is possible to adopt a method of granulating and molding by adding water and a binder, a method of adding an additive and a binder to water and preparing a slurry in advance, and spraying or spraying the slurry on activated carbon. Any of the plural kinds of additives may be supported on the porous carrier first, or may be supported simultaneously. In such a loading method, various known binders (for example, carboxymethylcellulose, polyvinyl alcohol, arabic rubber) are used as necessary, and the smaller the amount used, the better.
本形態においてフィルタの形状（態様）は特に限定されるものではないが、例えば粉末状、粒状、球状の活性炭に薬剤を添着したものを不織布、ウレタンフォーム、紙、加工ボード等に添着した形状が挙げられる。このようにして得られたフィルタを、そのまま、あるいは、適当な通気性容器や吸着装置に充填、収容してアセトアルデヒド、ホルムアルデヒド等の低級アルデヒド類が充満しやすい自動車内、喫茶店、会議室、作業場又は家庭の居室等に配置することにより空気が浄化される。また、タバコフィルターに使用するとタバコ煙中のホルムアルデヒド、アセトアルデヒド等の有害・刺激成分を効率よく除去することができる。 In this embodiment, the shape (aspect) of the filter is not particularly limited. For example, a shape obtained by attaching a powdered, granular, or spherical activated carbon to a chemical to a nonwoven fabric, urethane foam, paper, processed board, or the like. Can be mentioned. The filter thus obtained is directly or filled in and accommodated in a suitable breathable container or adsorption device, and is easily filled with lower aldehydes such as acetaldehyde and formaldehyde, in a car, a coffee shop, a conference room, a workplace or Air is purified by placing it in a living room at home. In addition, when used in tobacco filters, harmful and irritating components such as formaldehyde and acetaldehyde in tobacco smoke can be efficiently removed.
本発明でアセトアルデヒドを吸着する薬剤としてモルホリンを使用する理由は、1)アセトアルデヒドの方がホルムアルデヒドよりも沸点、分子量ともに高く、吸着速度が速いこと、2)アセトアルデヒドは安定性がよいので活性炭の物理吸着に依存すること、3)モルホリンとの反応は、アルデヒドのカルボニル炭素がモルホリン窒素を求電子反応することにより開始されること、4)上記2)が律速となるため、アセトアルデヒドの方がホルムアルデヒドより吸着されやすいこと、であり、本形態におけるモルホリンの添着量は、活性炭に対して５〜２５質量％、好ましくは１０〜２０質量％である。２５質量％超であれば活性炭の物理吸着機能が抑制され、５質量％未満であれば化学吸着機能が極端に不足する一方、２０質量％以下であれば活性炭の物理吸着機能が十分に発揮され、１０質量％以上であれば物理吸着機能に見合った化学吸着機能が十分に発揮されるからである。実際には、モルホリンは添着量を増そうとしても１０〜２０質量％の範囲内でしか添着しない。 The reason for using morpholine as an agent for adsorbing acetaldehyde in the present invention is as follows: 1) Acetaldehyde has higher boiling point and molecular weight than formaldehyde, and faster adsorption rate; 2) Physical adsorption of activated carbon because acetaldehyde is stable. 3) The reaction with morpholine is initiated by the electrophilic reaction of the carbonyl carbon of the aldehyde with morpholine nitrogen. 4) Since the above 2) is rate-limiting, acetaldehyde is more adsorbed than formaldehyde. In this embodiment, the amount of morpholine added is 5 to 25% by mass, preferably 10 to 20% by mass, based on the activated carbon. If it exceeds 25% by mass, the physical adsorption function of activated carbon is suppressed, and if it is less than 5% by mass, the chemical adsorption function is extremely insufficient, while if it is 20% by mass or less, the physical adsorption function of activated carbon is sufficiently exhibited. This is because the chemical adsorption function commensurate with the physical adsorption function is sufficiently exhibited when the content is 10% by mass or more. Actually, morpholine is attached only within the range of 10 to 20% by mass even if the amount of addition is increased.
また、本発明でホルムアルデヒドを吸着する薬剤としてエチレン尿素を使用する理由は、1)ホルムアルデヒドは活性炭の触媒性により重合してパラホルムアルデヒドになって除去することができること、2)上記1)のため、ホルムアルデヒドの方がアセトアルデヒドより吸着されやすいこと、であり、本形態におけるエチレン尿素の添着量は、活性炭に対して５〜３０質量％、好ましくは１０〜２５質量％である。３０質量％超であれば活性炭の物理吸着機能が抑制され、５質量％未満であれば化学吸着機能が極端に不足する一方、２５質量％以下であれば活性炭の物理吸着機能が十分に発揮され、１０質量％以上であれば物理吸着機能に見合った化学吸着機能が十分に発揮されるからである。実際には、エチレン尿素は添着量を増やそうとしても１８質量％程度しか添着しない。 In addition, the reason for using ethylene urea as an agent for adsorbing formaldehyde in the present invention is that 1) formaldehyde can be removed by polymerization by the catalytic properties of activated carbon to form paraformaldehyde, and 2) because 1) above, It is that formaldehyde is more easily adsorbed than acetaldehyde, and the amount of ethylene urea added in this embodiment is 5 to 30% by mass, preferably 10 to 25% by mass with respect to the activated carbon. If it exceeds 30% by mass, the physical adsorption function of activated carbon is suppressed, and if it is less than 5% by mass, the chemical adsorption function is extremely insufficient. On the other hand, if it is 25% by mass or less, the physical adsorption function of activated carbon is sufficiently exhibited. This is because the chemical adsorption function commensurate with the physical adsorption function is sufficiently exhibited when the content is 10% by mass or more. Actually, ethylene urea is only attached to about 18% by mass even if the amount of addition is increased.
本形態において、モルホリン添着活性炭とエチレン尿素添着活性炭との配合比（モルホリン添着活性炭の質量（モルホリン添着活性炭量）をエチレン尿素添着活性炭の質量（エチレン尿素添着活性炭量）で除した配合比）は１／２＜モルホリン添着活性炭量／エチレン尿素添着活性炭量≦１であり、好ましくはモルホリン添着活性炭量／エチレン尿素添着活性炭量＝１である。モルホリン添着活性炭量／エチレン尿素添着活性炭量＞１であれば、アセトアルデヒドの吸着には優れるもののホルムアルデヒドの吸着が著しく低下し、モルホリン添着活性炭量／エチレン尿素添着活性炭量≦１／２であれば、ホルムアルデヒドの吸着には優れるもののアセトアルデヒドの吸着が著しく低下する。 In this embodiment, the blending ratio of the morpholine-impregnated activated carbon and the ethyleneurea-impregnated activated carbon (the blending ratio obtained by dividing the mass of the morpholine-attached activated carbon (the amount of the morpholine-attached activated carbon) by the mass of the ethyleneurea-attached activated carbon (the amount of the ethyleneurea-attached activated carbon)) / 2 <morpholine-impregnated activated carbon amount / ethylene urea-impregnated activated carbon amount ≦ 1, preferably morpholine-impregnated activated carbon amount / ethylene urea-impregnated activated carbon amount = 1. If the amount of morpholine-impregnated activated carbon / ethylene urea-impregnated activated carbon> 1, it is excellent in the adsorption of acetaldehyde, but the formaldehyde adsorption is remarkably reduced. Adsorption of acetaldehyde is remarkably reduced, although it is excellent for adsorption of.
つぎに、より具体的な実施例を、対照のための比較例とともに説明する。ただし、本発明のアルデヒド除去用ケミカルフィルタは、以下の例に限定して解釈されるものではない。
（実施例１）
不織布（三井化学株式会社製ＰＥＴスパンボンド不織布Ｒ−０１４、融点：２５８℃、厚さ：０．１９ｍｍ、目付：３４ｇ／ｍ２）の内側面を活性炭等が充填可能なように起毛し、この起毛面にモルホリン添着椰子殻粒状活性炭（日本エンバイロケミカルズ株式会社製ＧＡＡｃ４２８０Ｗ１、粒度分布：０．３５５〜０．１８０ｍｍのものが９０％以上、ベンゼン吸着量：３０％以上、ヨウ素吸着量：１２００ｍｇ/ｇ以上、添着剤：モルホリン、添着量：約１５％）、エチレン尿素添着椰子殻粒状活性炭（クラレケミカル株式会社製クラレコールＴＦＵ３２６０、粒度分布：３２〜６０メッシュのものが９０％以上、ベンゼン吸着量：３０％以上、ヨウ素吸着量：１２００ｍｇ/ｇ以上、添着剤：エチレン尿素、添着量：１８％）及びホットメルトパウダー（東京インキ株式会社製ＰＲ１０７０ｍ３０Ｐ、粒度：３５５μｍ以上のものが１０％以下、融点：１０５℃）を混合したものを散布した。このとき、モルホリン添着椰子殻粒状活性炭量：エチレン尿素添着椰子殻粒状活性炭量＝１：２（モルホリン添着椰子殻粒状活性炭量／エチレン尿素添着椰子殻粒状活性炭量＝１／２）とし、両活性炭の混合物４５０ｇ／ｍ２に対して１４質量％(６３ｇ／ｍ２)のホットメルトパウダーを混合した。
Next, more specific examples will be described together with comparative examples for comparison. However, the aldehyde removing chemical filter of the present invention is not construed as being limited to the following examples.
Example 1
The inner surface of a nonwoven fabric (Mitsui Chemicals Co., Ltd. PET spunbond nonwoven fabric R-014, melting point: 258 ° C., thickness: 0.19 mm, basis weight: 34 g / m 2 ) was raised so that activated carbon could be filled, and this Morpholine-impregnated coconut shell granular activated carbon on the brushed surface (GAAc 4280W1 manufactured by Nippon Enviro Chemicals Co., Ltd., particle size distribution: 90% or more of 0.355 to 0.180 mm, benzene adsorption amount: 30% or more, iodine adsorption amount: 1200 mg / g As described above, the adsorbent: morpholine, the amount of addition: about 15%, the ethylene urea-impregnated coconut shell granular activated carbon (Kuraray Chemical TFU3260 manufactured by Kuraray Chemical Co., Ltd., the particle size distribution: 90% or more of 32-60 mesh, the amount of benzene adsorption: 30% or more, iodine adsorption amount: 1200 mg / g or more, additive: ethylene urea, attachment amount: 18%) and hot Melt Powder (Tokyo Ink Co., Ltd. PR1070m 3 0P, particle size: 355 or more of 10% or less, the melting point: 105 ° C.) was sprayed with a mixture of. At this time, morpholine-impregnated coconut shell granular activated carbon amount: ethylene urea-added coconut shell granular activated carbon amount = 1: 2 (morpholine-added coconut shell granular activated carbon amount / ethylene urea-added coconut shell granular activated carbon amount = 1/2). 14% by mass (63 g / m 2 ) of hot melt powder was mixed with respect to 450 g / m 2 of the mixture.
つぎに、その散布物の上に不織布（三井化学株式会社製ＰＥＴスパンボンド不織布Ｒ−０１１、融点：２５８℃、厚さ：０．１３ｍｍ、目付：２４ｇ／ｍ２）を積層し、１６０℃で加熱して熱固着した三層構造の濾材とした。 Next, a non-woven fabric (PET spunbonded non-woven fabric R-011, manufactured by Mitsui Chemicals, Inc., melting point: 258 ° C., thickness: 0.13 mm, basis weight: 24 g / m 2 ) is laminated on the sprayed product, at 160 ° C. A three-layer filter medium heat-fixed by heating was used.
そして、この濾材５ｍ２／台を折り畳み、約６００ｇ／台のホットメルト樹脂製リボンでプリーツしてフィルタパックを作成し、フィルタパックの上下面とアルミニウム製枠の間を約２００ｇ／台のポリウレタン樹脂製シール材でシールして、寸法６１０×６１０×７５ｍｍのアルデヒド除去用ケミカルフィルタを作製した。
（実施例２）
モルホリン添着椰子殻粒状活性炭量：エチレン尿素添着椰子殻粒状活性炭量＝１：１（モルホリン添着椰子殻粒状活性炭量／エチレン尿素添着椰子殻粒状活性炭量＝１）とした以外は実施例１と同様にしてアルデヒド除去用ケミカルフィルタを作製した。
（比較例１）
モルホリン添着椰子殻粒状活性炭量：エチレン尿素添着椰子殻粒状活性炭量＝０：１（モルホリン添着椰子殻粒状活性炭量／エチレン尿素添着椰子殻粒状活性炭量＝０）とした以外は実施例１と同様にしてアルデヒド除去用ケミカルフィルタを作製した。
（比較例２）
モルホリン添着椰子殻粒状活性炭量：エチレン尿素添着椰子殻粒状活性炭量＝１：０（モルホリン添着椰子殻粒状活性炭量／エチレン尿素添着椰子殻粒状活性炭量＝∞）とした以外は実施例１と同様にしてアルデヒド除去用ケミカルフィルタを作製した。
Then, folding the filter medium 5 m 2 / stand, about 600 g / pedestal pleated hot melt resin ribbon to create a filter pack, about 200 g / pedestal polyurethane resin between the upper and lower surfaces and an aluminum frame of the filter pack Sealing was performed with a sealing material, and a chemical filter for removing aldehyde having a size of 610 × 610 × 75 mm was produced.
(Example 2)
Morpholine-impregnated coconut shell granular activated carbon amount: ethylene urea-added coconut shell granular activated carbon amount = 1: 1 (morpholine-added coconut shell granular activated carbon amount / ethylene urea-added coconut shell granular activated carbon amount = 1) Thus, a chemical filter for removing aldehyde was prepared.
(Comparative Example 1)
Morpholine-impregnated coconut shell granular activated carbon amount: ethylene urea-added coconut shell granular activated carbon amount = 0: 1 (morpholine-added coconut shell granular activated carbon amount / ethylene urea-added coconut shell granular activated carbon amount = 0) Thus, a chemical filter for removing aldehyde was prepared.
(Comparative Example 2)
Morpholine-impregnated coconut shell granular activated carbon amount: ethylene urea-impregnated coconut shell granular activated carbon amount = 1: 0 (morpholine-added coconut shell granular activated carbon amount / ethylene urea-added coconut shell granular activated carbon amount = ∞) Thus, a chemical filter for removing aldehyde was prepared.
これらの実施例、比較例で作製した各アルデヒド除去用ケミカルフィルタについて、対象ガスをアセトアルデヒド及びホルムアルデヒドとして、フィルタの除去効率と、フィルタの初期除去効率を１００％とした場合に除去効率８５％を保つことができる期間（フィルタの寿命）の評価を行った。試験方法はＪＡＣＡ（社団法人日本空気清浄協会）Ｎｏ．３８−２００２「クリーンルーム用ケミカルエアフィルタ性能試験方法指針」に従い、試験結果を表１に示す。 About each chemical filter for aldehyde removal produced in these Examples and Comparative Examples, when the target gas is acetaldehyde and formaldehyde and the removal efficiency of the filter and the initial removal efficiency of the filter are 100%, the removal efficiency of 85% is maintained. The period during which the filter can be used (the lifetime of the filter) was evaluated. The test method is JACA (Japan Air Cleaners Association) No. The test results are shown in Table 1 in accordance with 38-2002 “Guidelines for testing chemical air filter performance for clean rooms”.
表１において、フィルタの除去効率を示す「除去効率」は、フィルタの上流側のアセトアルデヒド濃度１００ｐｐｂに対し、フィルタの下流側のアセトアルデヒド濃度が１５ｐｐｂ以下であれば○、３０ｐｐｂ以下であれば△、３０ｐｐｂ超であれば×とした。また、フィルタの上流側のホルムアルデヒド濃度２６７ｐｐｂに対し、フィルタの下流側のホルムアルデヒド濃度が４０ｐｐｂ以下であれば○、８０ｐｐｂ以下であれば△、８０ｐｐｂ超であれば×とした。また、「結果」は、アセトアルデヒド及びホルムアルデヒドのそれぞれについて、フィルタでの通気処理の初期の除去効率を１００％としたときに除去効率８５％以上を維持することができる期間が１年以上であれば◎、０．５年超えは○、０．５年以下であれば×とした。そして、アセトアルデヒド及びホルムアルデヒドの双方について○であれば、そのフィルタは十分な寿命を有すると評価する。 In Table 1, “removal efficiency” indicating the filter removal efficiency is ◯ if the acetaldehyde concentration on the downstream side of the filter is 100 ppb or less relative to 100 ppb on the upstream side of the filter, Δ if it is 30 ppb or less, and 30 ppb. When it was super, it was set as x. Further, with respect to the formaldehyde concentration 267 ppb on the upstream side of the filter, the case where the formaldehyde concentration on the downstream side of the filter was 40 ppb or less was evaluated as ○, when the value was 80 ppb or less, Δ, and when the value exceeded 80 ppb, the result was ×. In addition, the “result” indicates that for each of acetaldehyde and formaldehyde, the removal efficiency of 85% or more can be maintained for 1 year or more when the initial removal efficiency of the aeration process in the filter is 100%. ◎, over 0.5 years, ○, and 0.5 years or less, x. And if it is (circle) about both acetaldehyde and formaldehyde, it will evaluate that the filter has sufficient lifetime.
表１に示すように、実施例１，２では、アセトアルデヒド濃度を４８μｇ／ｍ３（３０ｐｐｂ）以下に、ホルムアルデヒド濃度を１００μｇ／ｍ３（８０ｐｐｂ）以下にすることができるので、厚生省・厚生労働省の室内濃度指針値を満足する。これに対し、比較例１，２では、アセトアルデヒド、ホルムアルデヒドの一方については室内濃度指針値を十分に満たすことができるものの、他方については満足することができず、アセトアルデヒド及びホルムアルデヒドが共存する場合に室内濃度指針値をクリアすることができない。 As shown in Table 1, in Examples 1 and 2, since the acetaldehyde concentration can be 48 μg / m 3 (30 ppb) or less and the formaldehyde concentration can be 100 μg / m 3 (80 ppb) or less, the Ministry of Health, Labor and Welfare Satisfies the indoor concentration guideline value. On the other hand, in Comparative Examples 1 and 2, although one of acetaldehyde and formaldehyde can sufficiently satisfy the indoor concentration guideline value, the other cannot be satisfied, and when acetaldehyde and formaldehyde coexist, The concentration guide value cannot be cleared.
また、実施例１のように添着活性炭配合比（モルホリン添着活性炭量／エチレン尿素添着活性炭量）が１／２であると、ホルムアルデビドについては８５％の除去効率を０．５年超えに保つことができ、アセトアルデビドについても０．５年超えに保つことができる。 In addition, when the impregnated activated carbon compounding ratio (amount of morpholine-impregnated activated carbon / amount of activated carbon impregnated with ethylene urea) is ½ as in Example 1, 85% removal efficiency of formalvid can be maintained over 0.5 years. Acetaldehyde can also be maintained for over 0.5 years.
また、実施例２では、アセトアルデヒド及びホルムアルデビドの双方について当初の除去効率に対して８５％の除去効率を１年以上保つことができ、フィルタが十分な寿命を有するといえる。 Moreover, in Example 2, it can be said that the removal efficiency of 85% with respect to the initial removal efficiency can be maintained for 1 year or more for both acetaldehyde and formaldehyde and the filter has a sufficient lifetime.
さらに、比較例１のように添着活性炭配合比が０（モルホリン添着活性炭量：エチレン尿素添着活性炭量＝０：１）であると、ホルムアルデビドについては８５％の除去効率を０．５年超えに保つことができるが、アセトアルデビドについては保つことができずに寿命が極端に短くなり、比較例２のように添着活性炭配合比が∞（モルホリン添着活性炭量：エチレン尿素添着活性炭量＝１：０）であると、アセトアルデビドについては８５％の除去効率を０．５年超えに保つことができるが、ホルムアルデビドについては保つことができずに寿命が極端に短くなる。 Further, as in Comparative Example 1, when the impregnated activated carbon blending ratio is 0 (amount of morpholine-impregnated activated carbon: amount of activated carbon impregnated with ethylene urea = 0: 1), the removal efficiency of 85% for formaldehyde is maintained over 0.5 years. However, with regard to acetaldehyde, it cannot be maintained and the life is extremely shortened. As in Comparative Example 2, the ratio of the impregnated activated carbon is ∞ (the amount of morpholine-impregnated activated carbon: the amount of ethylene urea-impregnated activated carbon = 1: 0). In the case of acetaldehyde, the removal efficiency of 85% can be maintained over 0.5 years, but for formaldehyde, it cannot be maintained and the life is extremely shortened.
本発明のアルデヒド除去用ケミカルフィルタは、シックハウス症候群が問題視される家庭環境や作業環境のみならず、博物館等の文化財保存環境やその他アルデヒドが存在する環境において広範に利用することができる。 The chemical filter for removing aldehyde of the present invention can be widely used not only in a home environment and a working environment where sick house syndrome is regarded as a problem, but also in a cultural property preservation environment such as a museum and other environments where an aldehyde exists.
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| JP2001096149A (en) * | 1999-10-01 | 2001-04-10 | Kuraray Chem Corp | Porous adsorbent and filter |
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