JP2010142706A - Hydrogen sulfide removal filter for gas detector - Google Patents
Hydrogen sulfide removal filter for gas detector Download PDFInfo
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- JP2010142706A JP2010142706A JP2008320847A JP2008320847A JP2010142706A JP 2010142706 A JP2010142706 A JP 2010142706A JP 2008320847 A JP2008320847 A JP 2008320847A JP 2008320847 A JP2008320847 A JP 2008320847A JP 2010142706 A JP2010142706 A JP 2010142706A
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Abstract
Description
本発明は、ガス検出器のガス口に配置して硫化水素を除去するフィルタに関する。 The present invention relates to a filter that is disposed at a gas port of a gas detector to remove hydrogen sulfide.
シアン化合物はメッキ工場などで広く使用されている物質で、非常に強い毒性のために水質環境基準や排水基準などの規制値が定められ，排水，河川水，下水道水，浄水場取水口などで常時監視されているが、高濃度の硫化水素が共存する現場などでは測定結果に影響を与えるため、通気性基材に酢酸鉛（II）三水和物（（ＣＨ３ＣＯＯ）2Ｐｂ３Ｈ2Ｏ）を含浸させて構成されフィルタがガス検出器のガス口に配置されいる。 Cyanide is a substance widely used in plating factories, etc., and because of its extremely high toxicity, regulatory values such as water quality standards and drainage standards have been established, such as drainage, river water, sewage water, and water treatment plant intakes. Although it is constantly monitored, the measurement results are affected in places where high-concentration hydrogen sulfide coexists, so lead (II) acetate trihydrate ((CH3COO) 2Pb3H2O) is impregnated into the breathable substrate. A configured filter is disposed at the gas port of the gas detector.
しかしながら硫化水素の濃度が高い場合には長時間、例えば8時間程度に亘って十分に硫化水素を除去することができず、シアン化水素の検出誤差が生じるという不都合がある。
本発明はこのような事情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高濃度の硫化水素を確実に除去してシアン化水素を高い精度で検出し、かつ代替えの基準ガスを用いて校正することができるフィルタを提供することである。
However, when the concentration of hydrogen sulfide is high, hydrogen sulfide cannot be sufficiently removed over a long period of time, for example, about 8 hours, and there is a disadvantage that detection error of hydrogen cyanide occurs.
The present invention has been made in view of such circumstances, and its object is to reliably remove high-concentration hydrogen sulfide to detect hydrogen cyanide with high accuracy, and to perform calibration using an alternative reference gas. It is to provide a filter that can.
このような課題を達成するために本発明においては、ガス透過性の基材に酢酸鉛と硝酸鉛を担持させるようにした。 In order to achieve such problems, in the present invention, lead acetate and lead nitrate are supported on a gas permeable substrate.
基材に含まれている硝酸鉛が、硫化水素吸収剤である酢酸鉛の活性を維持させるように作用するため、酢酸鉛が単独で存在する場合よりも高濃度の硫化水素が通過するのを長時間防止できる。そればかりでなく硝酸鉛はホスフィン（ＰＨ3）に対する吸着性が低いため、ホスフィン（ＰＨ3）を使用して校正することが可能となる。 The lead nitrate contained in the base material acts to maintain the activity of lead acetate, a hydrogen sulfide absorbent, so that a higher concentration of hydrogen sulfide passes through than when lead acetate is present alone. Can prevent for a long time. In addition, lead nitrate has a low adsorptivity to phosphine (PH3), so that it can be calibrated using phosphine (PH3).
そこで以下に本発明の詳細を実施例に基づいて説明する。
フィルタは、耐酸性に優れた通気性基材、たとえばガラス繊維製ろ紙(アドバンテック社製 厚さ7.4ｍｍ)に酢酸鉛（II）三水和物（（ＣＨ３ＣＯＯ）2Ｐｂ３Ｈ2Ｏ）及び硝酸鉛（Ｐｂ（ＮＯ3）2）を担持させて構成されている。
Therefore, details of the present invention will be described below based on examples.
The filter is made of a breathable base material excellent in acid resistance, for example, glass fiber filter paper (advantech thickness 7.4 mm), lead (II) acetate trihydrate ((CH3COO) 2Pb3H2O) and lead nitrate (Pb (NO3 ) 2) is supported.
すなわち、0.79ｍｏｌ/ｌの酢酸鉛及び0.20ｍｏｌ/ｌの硝酸鉛を含む水溶液に通気性基材を浸漬して各繊維間に浸透するに必要な時間、例えば3分間、浸漬し、通気性基材を溶液から引き上げて室温よりも若干高い温度、例えば40℃で自然乾燥させる。そしてガス検出器のガス取り入れ口のサイズに裁断してフィルタに構成されている。 That is, the breathable substrate is dipped in an aqueous solution containing 0.79 mol / l of lead acetate and 0.20 mol / l of lead nitrate so as to penetrate between the fibers, for example, for 3 minutes. The material is pulled out of the solution and allowed to dry naturally at a temperature slightly above room temperature, for example 40 ° C. And it cuts into the size of the gas inlet of a gas detector, and is constituted by the filter.
このようにして構成されたフィルタは、酢酸鉛（II）三水和物（（ＣＨ３ＣＯＯ）2Ｐｂ３Ｈ2Ｏ）だけではなく、硝酸鉛（Ｐｂ（ＮＯ3）2）を含むため、硫化水素の吸着量を向上させようとして酢酸鉛（II）三水和物だけを単独に増量した場合に比較してシアン化水素の検出感度の低下を防止できる。 The filter constructed in this way contains not only lead (II) acetate trihydrate ((CH3COO) 2Pb3H2O) but also lead nitrate (Pb (NO3) 2), thus improving the amount of adsorption of hydrogen sulfide. Thus, it is possible to prevent a decrease in hydrogen cyanide detection sensitivity as compared with the case where only lead (II) trihydrate is increased alone.
すなわち、酢酸鉛（II）三水和物だけをその含浸量を変えてフィルタを構成し、このフィルタを用いて一定濃度のシアン化水素を検出すると、図1の●で示したように酢酸鉛の量が増加すると検出感度が徐々に低下する。 That is, when a filter is constructed by changing the amount of impregnation of only lead (II) acetate trihydrate, and a constant concentration of hydrogen cyanide is detected using this filter, the amount of lead acetate as shown by ● in FIG. As the value increases, the detection sensitivity gradually decreases.
一方、本発明のように酢酸鉛（II）三水和物に硝酸鉛を規定量だけ添加すると、図1の▲で示したように酢酸鉛（II）三水和物に対する硝酸鉛の量が1/4程度までは感度が若干低下するものの、90％以上を維持できるため十分に実用に供することができる。 On the other hand, when a specified amount of lead nitrate is added to lead acetate (II) trihydrate as in the present invention, the amount of lead nitrate relative to lead (II) acetate trihydrate is reduced as shown by ▲ in FIG. Although sensitivity is slightly reduced up to about 1/4, 90% or more can be maintained, so that it can be practically used.
すなわち0.79mol/lの酢酸鉛（II）三水和物の溶液に硝酸鉛の濃度を変えた溶液を用意してそれぞれの溶液の通気性基材を浸漬し、上述と同様にフィルタを構成して硫化水素に対する感度を測定したところ図2のような結果を得た。
これにより、フィルタが存在しない状態でのシアン化水素の検出感度の85％程度の感度を得るには硝酸鉛を酢酸鉛（II）三水和物に対して0.75〜1.0の割合で添加することは、シアン化水素の検出感度の低下を可及的に抑えて酢酸鉛（II）三水和物の担持量を増加させてフィルタの寿命を延長することができる。
That is, prepare solutions with varying concentrations of lead nitrate in 0.79 mol / l lead acetate (II) acetate trihydrate solution, immerse the breathable substrate of each solution, and configure the filter in the same manner as described above. The sensitivity to hydrogen sulfide was measured, and the results shown in Fig. 2 were obtained.
Thus, in order to obtain a sensitivity of about 85% of the detection sensitivity of hydrogen cyanide in the absence of a filter, adding lead nitrate at a ratio of 0.75 to 1.0 with respect to lead acetate (II) trihydrate, It is possible to extend the life of the filter by suppressing the decrease in detection sensitivity of hydrogen cyanide as much as possible and increasing the load of lead (II) acetate trihydrate.
一方、所定濃度（500ppm）の硫化水素を流してシアン化水素換算出力が0.5ppmの出力が出るまでの時間を調べたところ、図3に示したような結果となった。
すなわち、酢酸鉛（II）三水和物だけでフィルタを構成した場合には、シアン化水素の濃度に換算して0.5ppmの出力が192分程度で発生した。
これに対して硝酸鉛（Ｐｂ（ＮＯ3）2）を添加した本発明のフィルタでは218分程度まではシアン化水素の濃度に換算して0.5ppmの出力は発生しなかった。
このことから硝酸鉛を添加することにより寿命を14％程度延長できることが確認された。
なお、通気性基材に含浸させる薬剤の量は、硝酸鉛と酢酸鉛（II）三水和物との比率を上述の範囲に維持して適宜に調整、つまり通気性の低下や析出の発生を可及的に抑えつつ最大量とするなり、フィルタの交換期間まで硫化水素を除去できる量に調整されることは言うまでも無い。
On the other hand, when hydrogen sulfide having a predetermined concentration (500 ppm) was flowed and the time until the output of hydrogen cyanide converted to 0.5 ppm was examined, the results shown in FIG. 3 were obtained.
That is, when the filter was composed only of lead (II) acetate trihydrate, an output of 0.5 ppm was generated in about 192 minutes in terms of the hydrogen cyanide concentration.
In contrast, the filter of the present invention to which lead nitrate (Pb (NO3) 2) was added did not generate an output of 0.5 ppm in terms of hydrogen cyanide concentration until about 218 minutes.
From this, it was confirmed that the life could be extended by about 14% by adding lead nitrate.
The amount of the chemical impregnated into the breathable base material is appropriately adjusted by maintaining the ratio of lead nitrate and lead (II) acetate trihydrate in the above-mentioned range, that is, the breathability is reduced or the precipitation occurs. Needless to say, the maximum amount is controlled while suppressing the amount of hydrogen sulfide as much as possible, and it is adjusted to an amount capable of removing hydrogen sulfide until the filter replacement period.
ところでガス検出器やガス測定装置、ガス警報機は、定期的に既知濃度の基準ガスを用いて校正を行う必要があるが、検出対象ガスであるシアン化水素は有毒ガスであるため安易に校正ガスとして使用することができない。 By the way, gas detectors, gas measuring devices, and gas alarms need to be periodically calibrated using a reference gas with a known concentration. However, hydrogen cyanide, which is a detection target gas, is a toxic gas and can be easily used as a calibration gas. Cannot be used.
そのため、シアン化水素の代替えガスとしてシアン化水素に比較して毒性の低いホスフィン（ＰＨ3）が用いられている。
このため、シアン化水素検出器の硫化水素除去用フィルタとしては、硫化水素を確実に吸着する一方、シアン化水素だけではなくホスフィン（ＰＨ3）も透過させるものであることが望まれる。
Therefore, phosphine (PH3), which is less toxic than hydrogen cyanide, is used as an alternative gas for hydrogen cyanide.
For this reason, it is desired that the hydrogen sulfide removal filter of the hydrogen cyanide detector be capable of adsorbing hydrogen sulfide reliably while allowing not only hydrogen cyanide but also phosphine (PH3) to pass therethrough.
本発明のフィルタをガス検出器のガス口に装着してホスフィン（ＰＨ3）の検量線を求めたところ、図4に示したようにシアン化水素と一定の比例関係で直線性を維持していることが確認できた。
このことから硫化水素を確実に除去しつつ、ホスフィン（ＰＨ3）により校正できることが確認できた。
When the filter of the present invention was attached to the gas port of the gas detector and the calibration curve for phosphine (PH3) was obtained, it was found that linearity was maintained in a constant proportional relationship with hydrogen cyanide as shown in FIG. It could be confirmed.
From this, it was confirmed that calibration was possible with phosphine (PH3) while removing hydrogen sulfide reliably.
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| JP2008320847A JP5241009B2 (en) | 2008-12-17 | 2008-12-17 | Hydrogen sulfide removal filter for hydrogen cyanide gas detector |
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| JP2008320847A JP5241009B2 (en) | 2008-12-17 | 2008-12-17 | Hydrogen sulfide removal filter for hydrogen cyanide gas detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012202918A (en) * | 2011-03-28 | 2012-10-22 | Horiba Stec Co Ltd | Spectrophotometer and calibration method for the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6199849A (en) * | 1984-10-19 | 1986-05-17 | Matsushita Electric Works Ltd | Gas detecting element with filter |
| JPH03125970A (en) * | 1989-10-11 | 1991-05-29 | Kurita Water Ind Ltd | Odor gas measuring apparatus |
| JPH1090247A (en) * | 1996-09-11 | 1998-04-10 | Tokyo Gas Co Ltd | THT detecting agent in fuel gas, method for preparing the same, and THT detecting tube |
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- 2008-12-17 JP JP2008320847A patent/JP5241009B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6199849A (en) * | 1984-10-19 | 1986-05-17 | Matsushita Electric Works Ltd | Gas detecting element with filter |
| JPH03125970A (en) * | 1989-10-11 | 1991-05-29 | Kurita Water Ind Ltd | Odor gas measuring apparatus |
| JPH1090247A (en) * | 1996-09-11 | 1998-04-10 | Tokyo Gas Co Ltd | THT detecting agent in fuel gas, method for preparing the same, and THT detecting tube |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012202918A (en) * | 2011-03-28 | 2012-10-22 | Horiba Stec Co Ltd | Spectrophotometer and calibration method for the same |
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