JP2015166696A - Siloxane removal filter for measurement of methanol - Google Patents
Siloxane removal filter for measurement of methanol Download PDFInfo
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- JP2015166696A JP2015166696A JP2014041093A JP2014041093A JP2015166696A JP 2015166696 A JP2015166696 A JP 2015166696A JP 2014041093 A JP2014041093 A JP 2014041093A JP 2014041093 A JP2014041093 A JP 2014041093A JP 2015166696 A JP2015166696 A JP 2015166696A
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Abstract
Description
本発明は、分析対象であるメタノールを吸着することなくシロキサンを吸着除去する分析装置用のフィルターに関する。 The present invention relates to a filter for an analyzer that adsorbs and removes siloxane without adsorbing methanol to be analyzed.
可燃性ガスを検出する場合には接触燃焼式ガスセンサが使用されるが、環境にシロキサンが存在すると、ガスセンサを構成する触媒層に付着して可燃性ガスの検出感度が低下するという問題がある。 When detecting combustible gas, a contact combustion type gas sensor is used. However, when siloxane is present in the environment, there is a problem that the detection sensitivity of combustible gas is reduced by adhering to the catalyst layer constituting the gas sensor.
このため特許文献１に見られるように被検出ガスを、スルホン化スチレン−ジビニルベンゼン共重合体、パーフルオロスルホン酸イオノマー、スルホン化スチレン−オレフィン共重合体、及びスルホン化ポリホスファゼンから選択された少なくとも一種のスルホン酸基を有する樹脂を吸着剤に使用したフィルタを通してガスセンサに導入することが提案されている。 Therefore, as shown in Patent Document 1, the gas to be detected is at least selected from a sulfonated styrene-divinylbenzene copolymer, a perfluorosulfonic acid ionomer, a sulfonated styrene-olefin copolymer, and a sulfonated polyphosphazene. It has been proposed to introduce a resin having a kind of sulfonic acid group into a gas sensor through a filter using an adsorbent.
しかしながらこのフィルタを利用して可燃性ガスであるメタノールを検出しようとすると、フィルタを構成する吸着剤がメタノールを吸着してメタノールの測定に誤差が生じるという問題がある。 However, if the filter is used to detect methanol, which is a combustible gas, there is a problem in that the adsorbent constituting the filter adsorbs methanol and an error occurs in the measurement of methanol.
本発明はこのような問題に鑑みてなされたものであってその目的とするところは分析対象であるメタノールを吸着することなくシロキサンを吸着除去する分析装置用のフィルターを提供することである。 The present invention has been made in view of such problems, and an object of the present invention is to provide a filter for an analyzer that adsorbs and removes siloxane without adsorbing methanol to be analyzed.
このような課題を達成するために本発明は水分含有率１５％以下のマクロポーラスを有するスチレンとジビニルベンゼンとの共重合物からなる合成吸着剤を使用する。 In order to achieve such a problem, the present invention uses a synthetic adsorbent comprising a copolymer of styrene and divinylbenzene having a macroporous content of 15% or less.
環境中のシロキサンを確実に吸着してメタノールを速やかに通過させる。 Adsorbs siloxane in the environment reliably and allows methanol to pass through quickly.
平均粒径が0.32〜0.70ｍｍで平均細孔直径が１〜６０ｎｍの範囲のマクロポーラスを有するスチレンとジビニルベンゼンとの共重合物の合成吸着剤（以下、スチレン系合成吸着剤という）の疎水性のスチレン系合成吸着剤、例えばＳＡＰ−9210、9230、9240、9270、9280（ムロマチテクノス（株）の商品名）を脱水処理して構成されている。 Hydrophobicity of a synthetic adsorbent of a copolymer of styrene and divinylbenzene (hereinafter referred to as a styrene synthetic adsorbent) having a macroporous particle size of 0.32 to 0.70 mm and an average pore diameter of 1 to 60 nm. Styrene-based synthetic adsorbents such as SAP-9210, 9230, 9240, 9270, and 9280 (trade names of Muromachi Technos Co., Ltd.).
上記脱水処理はスチレンとジビニルベンゼンとの共重合物の合成吸着剤（以下、スチレン系合成吸着剤という）の物理的性質を変性させず、かつ水分を揮発させることができる程度の温度と時間、例えば温度１０５℃で６時間の加熱処理により行われる。
この加熱処理は、スチレン系合成吸着剤が含有、もしくは吸着されている60〜70％程度の水分を１５％以下、好ましくは３％程度にまで脱水させる。これにより吸着剤としてのマクロポーラスの物理的性質を維持しつつ乾燥させて疎水性を高することができる。
The above dehydration treatment does not modify the physical properties of a synthetic adsorbent of a copolymer of styrene and divinylbenzene (hereinafter referred to as a styrene synthetic adsorbent) and can evaporate moisture, For example, the heat treatment is performed at a temperature of 105 ° C. for 6 hours.
In this heat treatment, about 60 to 70% of the water containing or adsorbed with the styrene synthetic adsorbent is dehydrated to 15% or less, preferably about 3%. This makes it possible to increase the hydrophobicity by drying while maintaining the physical properties of the macroporous as the adsorbent.
この結果、マクロポーラスの物理的性質によりシロキサンに対する吸着力を維持しつつ疎水性によりメタノールに対する吸着力が極端に低下する。
もとより、スチレン系合成吸着剤のマクロポーラスに対するメタノールの吸着力は極めて低い。
As a result, the adsorptive power to methanol is extremely lowered due to the hydrophobicity while maintaining the adsorptive power to siloxane due to the macroporous physical properties.
Of course, the adsorption power of methanol to the macroporous styrene synthetic adsorbent is extremely low.
図１は、空気中にシロキサンを２ｐｐｍ、メタノールを５０％ＬＥＬ含むサンプルガスを本発明のフィルタを使用して測定した場合と、使用せずに測定した場合のセンサの感度の時間経過を示すものである。
すなわち、図中符号Ａは平均粒径0.6〜0.75ｍｍ、また符号Ｂは本発明のフィルタを使用しない場合の感度の変化を示すものである。
FIG. 1 shows the time course of sensor sensitivity when a sample gas containing 2 ppm siloxane and 50% LEL in air is measured using the filter of the present invention and not using it. It is.
That is, the symbol A in the figure represents an average particle size of 0.6 to 0.75 mm, and the symbol B represents a change in sensitivity when the filter of the present invention is not used.
また図２は、メタノールの爆発下限界濃度（LEL）５０％（空気中３.７５％VOL）の気体を本発明のフィルターを使用して測定した場合の応答特性（図中 実線）と、フィルタを使用せずに測定した場合との応答特性（図中 点線）を示すものである。
この図２からも本発明のフィルタによる応答特性の低下、及び指示値の低下はほとんど生じないことが分かった。
Fig. 2 shows the response characteristics (solid line in the figure) when measuring a gas with a lower explosion limit concentration (LEL) of 50% (3.75% VOL in air) using the filter of the present invention, and the filter. It shows the response characteristics (dotted line in the figure) when measured without using.
It can be seen from FIG. 2 that the response characteristic and the indicated value are hardly lowered by the filter of the present invention.
なお、比較のため他の高分子、つまりアクリル系吸着剤（例えばマクロポーラスタイプPAP-9210（ムロマチテクノス（株）の商品名））、及びフェノール系吸着剤（例えばマクロポーラスタイプWAP-9211（ムロマチテクノス（株）の商品名））を上述と同様の乾燥処理を行ったが、これら吸着剤は親水性と疎水性との中間的な性状を有してメタノールを吸着するため、メタノールの検出用のフィルタとして使用することはできなかった。 For comparison, other polymers, that is, an acrylic adsorbent (for example, macroporous type PAP-9210 (trade name of Muromachi Technos)) and a phenolic adsorbent (for example, macroporous type WAP-9211 (Muromachi) Technos Co., Ltd. trade name)) was subjected to the same drying treatment as described above. However, these adsorbents have intermediate properties between hydrophilic and hydrophobic, and adsorb methanol. Could not be used as a filter.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2014041093A JP2015166696A (en) | 2014-03-04 | 2014-03-04 | Siloxane removal filter for measurement of methanol |
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| JP2014041093A JP2015166696A (en) | 2014-03-04 | 2014-03-04 | Siloxane removal filter for measurement of methanol |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5350443A (en) * | 1993-04-19 | 1994-09-27 | Bluecher Hasso Von | Filter sheet material for passenger cabins in motor vehicles |
| JP2007054774A (en) * | 2005-08-26 | 2007-03-08 | Saitama Prefecture | Apparatus for treating voc and cartridge for apparatus for treating voc |
| JP2011212565A (en) * | 2010-03-31 | 2011-10-27 | Osaka Gas Co Ltd | Siloxane removing agent and filter using the same |
| JP2012241037A (en) * | 2011-05-16 | 2012-12-10 | Osaka Gas Co Ltd | Porous resin aggregation, siloxane remover and filter using the same |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5350443A (en) * | 1993-04-19 | 1994-09-27 | Bluecher Hasso Von | Filter sheet material for passenger cabins in motor vehicles |
| US5350443B1 (en) * | 1993-04-19 | 1998-05-05 | Hasso Von Bluecher | Filter sheet material for passenger cabins in motor vehicles |
| US5350443B2 (en) * | 1993-04-19 | 1999-08-10 | Von Hasso Bluecher | Filter sheet material for passenger cabins in motor vehicles |
| JP2007054774A (en) * | 2005-08-26 | 2007-03-08 | Saitama Prefecture | Apparatus for treating voc and cartridge for apparatus for treating voc |
| JP2011212565A (en) * | 2010-03-31 | 2011-10-27 | Osaka Gas Co Ltd | Siloxane removing agent and filter using the same |
| JP2012241037A (en) * | 2011-05-16 | 2012-12-10 | Osaka Gas Co Ltd | Porous resin aggregation, siloxane remover and filter using the same |
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