JP3948075B2 - Acid component removal agent and acid component removal method - Google Patents
Acid component removal agent and acid component removal method Download PDFInfo
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- JP3948075B2 JP3948075B2 JP26895697A JP26895697A JP3948075B2 JP 3948075 B2 JP3948075 B2 JP 3948075B2 JP 26895697 A JP26895697 A JP 26895697A JP 26895697 A JP26895697 A JP 26895697A JP 3948075 B2 JP3948075 B2 JP 3948075B2
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- acidic component
- hydrogen carbonate
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Description
【０００１】
【発明の属する技術分野】
本発明は、気体中の酸性成分除去剤、その製造方法および酸性成分除去方法に関する。
【０００２】
【従来の技術】
ゴミ焼却炉などから排出されるダイオキシンの除去方法として、一般にダイオキシンの発生に関与するとされている塩酸を中和、吸収するために、消石灰を酸性成分除去剤として用いることが知られている。この場合、焼却炉等からの排ガス排出路における１５０〜２５０℃の温度域に消石灰を分散し、バグフィルタで捕集し、ろ過層を形成して酸性成分を除去している。
【０００３】
【発明が解決しようとする課題】
しかし消石灰は、反応当量に対して過剰に使用する必要がある、高温では除去性能が低下する、廃棄するダスト量が増加するなどの欠点があった。本発明は、高温の排ガスからも効率良く、塩酸などの酸性成分を吸着除去でき、かつ廃棄処理も容易な酸性成分除去剤を提供することを目的とする。
【０００４】
【課題を解決するための手段】
本発明の第１の態様は、重量基準の平均粒子径が２０μｍ以下の粒子であって、水銀圧入式細孔分布測定装置で測定した細孔直径１０〜１０００ｎｍの細孔容積が０．２ｃｃ／ｇ以上の、炭酸ナトリウムまたは炭酸カリウムからなる気体中の酸性成分除去剤である。
【０００５】
この酸性成分除去剤は、炭酸ナトリウムまたは炭酸カリウムからなるため、高温の排ガス中で、酸性成分を吸着する能力が高い。炭酸ナトリウムと炭酸カリウムの混合物であってもよい。
【０００６】
平均粒子径は、重量基準で２０μｍ以下であることが必要である。なお、本明細書では、平均粒子径はすべて重量基準で表す。平均粒子径が、２０μｍを超える場合は、酸性成分の除去効率が落ちるので好ましくない。特に好ましい平均粒子径は、１〜１５μｍである。
【０００７】
細孔容積は、水銀圧入式細孔分布測定装置で測定した細孔容積が０．２ｃｃ／ｇ以上であることが必要である。本明細書では、細孔容積はすべて水銀圧入式細孔分布測定装置で測定したものである。この細孔容積は、細孔直径で１０〜１０００ｎｍの細孔の細孔容積である。細孔容積が０．２ｃｃ／ｇに満たない場合は、酸性成分の除去効率が落ちるので好ましくない。特に好ましい、細孔直径で１０〜１０００ｎｍの細孔の細孔容積は、０．３ｃｃ／ｇ以上である。
第１の態様の酸性成分除去剤は、ＢＥＴ法で測定した比表面積が４ｍ2 ／ｇ以上である場合は、さらに好ましい。
【０００８】
炭酸水素ナトリウムまたは炭酸水素カリウムは、高温の排ガス中に投入したときに、容易に炭酸ナトリウムまたは炭酸カリウムに転換する。このときの炭酸ナトリウムまたは炭酸カリウムが上記第１の態様の酸性成分除去剤の物性を満たす場合は、同様に高い酸性成分除去性を有する。
【０００９】
したがって、本発明は第２の態様として、重量基準の平均粒子径が２０μｍ以下の粒子であって、細孔直径１０ｎｍ〜１０μｍの細孔の細孔容積が０．１ｃｃ／ｇ以上の、炭酸水素ナトリウムまたは炭酸水素カリウムからなる気体中の酸性成分除去剤を提供する。この物性の炭酸水素ナトリウムまたは炭酸水素カリウムは、高温の排ガス中に投入したときに、本発明の第１の態様の酸性成分除去剤に容易に転換する。炭酸水素ナトリウムおよび炭酸水素カリウムを混合して使用することもできる。
第２の態様の酸性成分除去剤は、ＢＥＴ法で測定した比表面積が２ｍ2 ／ｇ以上である場合は、さらに好ましい。
【００１０】
本発明の、酸性成分除去剤は、処理すべき気体中に分散し、気体中の酸性成分の少なくとも一部を吸着した酸性成分除去剤を、バグフィルタで捕集することにより、気体中の酸性成分を除去できる。第２の態様の酸性成分除去剤を用いる場合は、炭酸水素ナトリウムまたは炭酸水素カリウムが、炭酸ナトリウムまたは炭酸カリウムに速やかに転換するよう、２００〜３００℃の気体中に分散するのが好ましい。
【００１１】
【発明の実施の形態】
本発明の第１の態様の酸性成分除去剤を製造するには、通常の炭酸水素ナトリウムまたは炭酸水素カリウムを粉砕などによって粒径２０μｍ以下にし、さらに熱処理を行って炭酸ナトリウムまたは炭酸カリウムに転換するのが好ましい。このときの熱処理条件としては、２００〜４００℃で保持するのが好ましい。熱処理前の、炭酸水素ナトリウムまたは炭酸水素カリウムは、そのまま本発明の第２の態様の酸性成分除去剤として使用できる。
【００１２】
本発明の酸性成分除去剤を使用するにあたっては、酸性成分除去剤を気体中に分散し、バグフィルタで捕集すると、バグフィルタ表面に酸性成分除去剤のろ過層が形成されるので、効率的に酸性成分を除去できる。
【００１３】
また、微細な炭酸ナトリウム、炭酸カリウム、炭酸水素ナトリウム、炭酸水素カリウムは、長期間保存しておいた場合に固結してしまう場合がある。本発明の酸性成分除去剤は、固結によってその特性を低下させるおそれがあるので、固結防止剤を含有するのが好ましい。固結防止剤としてはシリカが好ましい。具体的には、ヒュームドシリカと呼ばれる微細な無水ケイ酸が好ましい。その含有量としては、酸性成分除去剤の０．１〜１重量％程度が好ましい。
【００１４】
【実施例】
「例１」
旭硝子株式会社製の平均粒子径８５μｍの炭酸水素ナトリウムを、気流による分級機を備えた衝撃式乾式粉砕機（ホソカワミクロン株式会社製、商品名ＡＣＭパルベライザー）にて微粉砕して、平均粒子径３．９μｍの炭酸水素ナトリウムを得た。この炭酸水素ナトリウムの細孔直径１０ｎｍ〜１０μｍの細孔容積は０．７１４ｃｃ／ｇであった。ＢＥＴ法で測定した比表面積は３．３１ｍ2 ／ｇであった。
【００１５】
この炭酸水素ナトリウムを、２００℃の恒温乾燥器内に３時間静置して、炭酸ナトリウムとした。この炭酸ナトリウムは、平均粒子径が３．９μｍで、細孔直径１０〜１０００ｎｍの細孔容積は０．３７８ｃｃ／ｇであった。平均粒子径はリーズ・アンド・ノースロップ社製マイクロトラック９３２０ＨＲＡを用い、細孔容積はマイクロメリティックス社製ポアサイザ９３１０を用いて、それぞれ測定した。この酸性成分除去剤は、ＢＥＴ法で測定した比表面積が６．１４ｍ2 ／ｇであった。
【００１６】
この炭酸ナトリウムに固結防止剤として、平均粒子径０．０１μｍのヒュームドシリカ（株式会社トクヤマ製、商品名レオシールＣＰ−１０２）を０．５重量％添加して混合した。
【００１７】
このようにして得られた酸性成分除去剤について、酸性ガスの吸収性能を次のようにして評価した。縦に保持したポリ塩化ビニル製パイプに試料を入れ、両端を濾布で封じた。このパイプの下部から上部に向かって、濾布を通して濃度６００体積ｐｐｍの塩酸を含む空気を流した。流した塩酸の総量は、試料の炭酸ナトリウムの理論反応量の半分、ガス速度は１ｍ／秒とした。充填した炭酸ナトリウムを１規定の塩酸で中和滴定して未反応量を求めることにより算出した塩酸の吸収率は、２０％であった。
また、この酸性成分除去剤は、室内に６０日間放置した後でも、良好な流動性を有していた。
【００１８】
「例２（比較例）」
旭硝子株式会社製の平均粒子径８５μｍの炭酸水素ナトリウムを、高速で回転するピンと粒子との衝撃によって粉砕するピンミル式粉砕機（ホソカワミクロン株式会社社製、商品名コロプレックス）にて粉砕することによって、平均粒子径５１μｍの炭酸水素ナトリウムを得た。この炭酸水素ナトリウムを、２００℃の恒温乾燥器内で３時間静置し、炭酸ナトリウムとした。
【００１９】
例１と同様に評価したところ、平均粒子径が５１μｍで、水銀圧入式細孔分布測定装置で測定した細孔直径１０〜１０００ｎｍの細孔容積は、０．２９３ｃｃ／ｇであった。塩酸ガスの吸収率は、１０％であった。例１に比べて、平均粒子径が大きいことが、低い吸収率の原因であると思われる。
【００２０】
「例３（比較例）」
旭硝子株式会社製の平均粒子径２５μｍの炭酸ナトリウム（粒灰；炭酸水素ナトリウムを熱処理して得た炭酸ナトリウムを１水塩にした後、再度無水塩としたもの）を、気流による分級機を備えた衝撃式乾式粉砕機（ホソカワミクロン株式会社製、商品名ＡＣＭパルベライザー）で微粉砕することによって、平均粒子径３．４μｍの炭酸ナトリウムを得た。
【００２１】
例１と同様に評価したところ、平均粒子径が３．４μｍで、水銀圧入式細孔分布測定装置で測定した細孔直径１０〜１０００ｎｍの細孔容積は、０．０８８ｃｃ／ｇであった。塩酸の吸収率は、４％であった。例１に比べて、細孔直径１０〜１０００ｎｍの細孔容積が小さいことが、低い吸収率の原因であると思われる。
【００２２】
【発明の効果】
本発明の酸性成分除去剤は、排ガス中の酸性成分、特に塩酸成分を高い効率で吸収できる。また、炭酸ナトリウムは水溶性であるので、排ガス中の酸性成分除去後のダストは、水洗処理できるという優れた効果も有する。
【００２３】
本発明の酸性成分除去剤は、ゴミ焼却場などから排出される排ガス中の酸性成分、特に塩酸を効率良く除去し、また発生する焼却残さを減少できるなどの効果を有し、環境への影響を大幅に低減できる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an acid component removing agent in a gas, a production method thereof, and an acid component removal method.
[0002]
[Prior art]
As a method for removing dioxins discharged from a garbage incinerator or the like, it is known to use slaked lime as an acidic component remover in order to neutralize and absorb hydrochloric acid which is generally considered to be involved in the generation of dioxins. In this case, slaked lime is dispersed in a temperature range of 150 to 250 ° C. in an exhaust gas discharge path from an incinerator or the like, collected by a bag filter, and a filtration layer is formed to remove acidic components.
[0003]
[Problems to be solved by the invention]
However, slaked lime has disadvantages such as being required to be used excessively with respect to the reaction equivalent, removing performance at a high temperature, and increasing the amount of dust to be discarded. An object of the present invention is to provide an acidic component removing agent that can efficiently adsorb and remove acidic components such as hydrochloric acid from high-temperature exhaust gas and that can be easily disposed of.
[0004]
[Means for Solving the Problems]
The first aspect of the present invention is a particle having a weight-based average particle size of 20 μm or less, and a pore volume of 10 to 1000 nm as measured with a mercury intrusion pore distribution measuring device is 0.2 cc / It is an acidic component removal agent in the gas which consists of sodium carbonate or potassium carbonate more than g.
[0005]
Since this acidic component removing agent is made of sodium carbonate or potassium carbonate, it has a high ability to adsorb acidic components in high-temperature exhaust gas. It may be a mixture of sodium carbonate and potassium carbonate.
[0006]
The average particle size needs to be 20 μm or less on a weight basis. In the present specification, all average particle diameters are expressed on a weight basis. If the average particle diameter exceeds 20 μm, the removal efficiency of acidic components is lowered, which is not preferable. A particularly preferable average particle diameter is 1 to 15 μm.
[0007]
The pore volume is required to be 0.2 cc / g or more as measured with a mercury intrusion pore distribution measuring device. In this specification, all pore volumes are measured with a mercury intrusion pore distribution measuring device. This pore volume is the pore volume of pores having a pore diameter of 10 to 1000 nm. When the pore volume is less than 0.2 cc / g, the removal efficiency of acidic components is not preferable. The pore volume of pores having a pore diameter of 10 to 1000 nm is particularly preferably 0.3 cc / g or more.
The acidic component removing agent according to the first aspect is more preferable when the specific surface area measured by the BET method is 4 m 2 / g or more.
[0008]
Sodium hydrogen carbonate or potassium hydrogen carbonate is easily converted into sodium carbonate or potassium carbonate when it is put into a high-temperature exhaust gas. When sodium carbonate or potassium carbonate at this time satisfies the physical properties of the acidic component removing agent of the first aspect, it has a high acidic component removing property.
[0009]
Therefore, the present invention provides, as a second aspect, a hydrogen carbonate in which the weight-based average particle diameter is 20 μm or less, and the pore volume of pores having a pore diameter of 10 nm to 10 μm is 0.1 cc / g or more. An agent for removing an acidic component in a gas comprising sodium or potassium hydrogen carbonate is provided. This physical property sodium hydrogen carbonate or potassium hydrogen carbonate is easily converted to the acidic component removing agent of the first aspect of the present invention when it is put into a high-temperature exhaust gas. A mixture of sodium hydrogen carbonate and potassium hydrogen carbonate can also be used.
The acidic component removing agent of the second aspect is more preferable when the specific surface area measured by the BET method is 2 m 2 / g or more.
[0010]
The acidic component remover of the present invention is dispersed in the gas to be treated, and the acidic component remover that has adsorbed at least a part of the acidic component in the gas is collected by a bag filter, so that the acidic component in the gas is collected. Components can be removed. When the acidic component removing agent of the second aspect is used, it is preferable that sodium hydrogen carbonate or potassium hydrogen carbonate is dispersed in a gas at 200 to 300 ° C. so as to be quickly converted to sodium carbonate or potassium carbonate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In order to produce the acidic component removing agent according to the first aspect of the present invention, normal sodium hydrogen carbonate or potassium hydrogen carbonate is reduced to a particle size of 20 μm or less by pulverization or the like, and further subjected to heat treatment to be converted into sodium carbonate or potassium carbonate. Is preferred. It is preferable to hold | maintain at 200-400 degreeC as heat processing conditions at this time. The sodium bicarbonate or potassium bicarbonate before the heat treatment can be used as it is as the acidic component removing agent of the second aspect of the present invention.
[0012]
In using the acidic component remover of the present invention, when the acidic component remover is dispersed in a gas and collected by a bag filter, a filtration layer of the acidic component remover is formed on the bag filter surface. The acidic component can be removed.
[0013]
In addition, fine sodium carbonate, potassium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate may solidify when stored for a long period of time. The acidic component removing agent of the present invention preferably contains an anti-caking agent because there is a risk that the properties thereof may be reduced by caking. Silica is preferred as the anti-caking agent. Specifically, fine silicic acid called fumed silica is preferable. The content is preferably about 0.1 to 1% by weight of the acidic component remover.
[0014]
【Example】
"Example 1"
Sodium hydrogen carbonate having an average particle size of 85 μm manufactured by Asahi Glass Co., Ltd. is finely pulverized by an impact dry pulverizer (trade name: ACM Pulverizer, manufactured by Hosokawa Micron Co., Ltd.) equipped with a classifier using an air stream. 9 μm sodium hydrogen carbonate was obtained. The pore volume of this sodium hydrogen carbonate having a pore diameter of 10 nm to 10 μm was 0.714 cc / g. The specific surface area measured by the BET method was 3.31 m 2 / g.
[0015]
This sodium hydrogen carbonate was left in a constant temperature dryer at 200 ° C. for 3 hours to obtain sodium carbonate. This sodium carbonate had an average particle size of 3.9 μm and a pore volume of 10 to 1000 nm in pore size of 0.378 cc / g. The average particle size was measured using a Microtrac 9320HRA manufactured by Leeds & Northrop, and the pore volume was measured using a pore sizer 9310 manufactured by Micromeritics. This acidic component remover had a specific surface area measured by the BET method of 6.14 m 2 / g.
[0016]
To this sodium carbonate, 0.5% by weight of fumed silica having an average particle size of 0.01 μm (trade name Leoseal CP-102, manufactured by Tokuyama Corporation) was added and mixed as an anti-caking agent.
[0017]
The acidic component removing agent thus obtained was evaluated for acid gas absorption performance as follows. A sample was put into a pipe made of polyvinyl chloride held vertically, and both ends were sealed with a filter cloth. From the bottom to the top of this pipe, air containing 600 ppm by volume of hydrochloric acid was passed through the filter cloth. The total amount of hydrochloric acid flowed was half the theoretical reaction amount of sodium carbonate of the sample, and the gas velocity was 1 m / second. The absorption rate of hydrochloric acid calculated by neutralizing and titrating the filled sodium carbonate with 1N hydrochloric acid to determine the unreacted amount was 20%.
The acidic component remover had good fluidity even after being left in the room for 60 days.
[0018]
"Example 2 (comparative example)"
By pulverizing sodium hydrogen carbonate with an average particle diameter of 85 μm manufactured by Asahi Glass Co., Ltd. with a pin mill type pulverizer (made by Hosokawa Micron Co., Ltd., trade name Coroplex) that pulverizes by impact of pins and particles rotating at high speed. Sodium hydrogen carbonate having an average particle diameter of 51 μm was obtained. This sodium hydrogen carbonate was allowed to stand in a constant temperature dryer at 200 ° C. for 3 hours to obtain sodium carbonate.
[0019]
When evaluated in the same manner as in Example 1, the pore volume with an average particle size of 51 μm and a pore diameter of 10 to 1000 nm measured with a mercury intrusion pore distribution measuring device was 0.293 cc / g. The absorption rate of hydrochloric acid gas was 10%. Compared to Example 1, the large average particle size seems to be the cause of the low absorption rate.
[0020]
"Example 3 (comparative example)"
Asahi Glass Co., Ltd. has an average particle size of 25μm sodium carbonate (granular ash; sodium carbonate obtained by heat-treating sodium bicarbonate to monohydrate and then converted to anhydrous salt), equipped with air classifier Was pulverized with an impact-type dry pulverizer (trade name: ACM Pulverizer, manufactured by Hosokawa Micron Corporation) to obtain sodium carbonate having an average particle size of 3.4 μm.
[0021]
When evaluated in the same manner as in Example 1, the pore volume with an average particle size of 3.4 μm and a pore diameter of 10 to 1000 nm measured with a mercury intrusion pore distribution measuring device was 0.088 cc / g. The absorption rate of hydrochloric acid was 4%. Compared to Example 1, a small pore volume with a pore diameter of 10 to 1000 nm seems to be the cause of the low absorption rate.
[0022]
【The invention's effect】
The acidic component removing agent of the present invention can absorb acidic components in exhaust gas, particularly hydrochloric acid components with high efficiency. Moreover, since sodium carbonate is water-soluble, the dust after removal of acidic components in the exhaust gas also has an excellent effect that it can be washed with water.
[0023]
The acidic component removing agent of the present invention has an effect of efficiently removing acidic components, particularly hydrochloric acid, in exhaust gas discharged from a garbage incineration plant, etc., and reducing the generated incineration residue, and has an effect on the environment. Can be greatly reduced.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26895697A JP3948075B2 (en) | 1997-10-01 | 1997-10-01 | Acid component removal agent and acid component removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26895697A JP3948075B2 (en) | 1997-10-01 | 1997-10-01 | Acid component removal agent and acid component removal method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005318346A Division JP2006082083A (en) | 2005-11-01 | 2005-11-01 | Agent and method for removing acid component in gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11104439A JPH11104439A (en) | 1999-04-20 |
| JP3948075B2 true JP3948075B2 (en) | 2007-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26895697A Expired - Fee Related JP3948075B2 (en) | 1997-10-01 | 1997-10-01 | Acid component removal agent and acid component removal method |
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Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3460626B2 (en) * | 1999-06-15 | 2003-10-27 | 栗田工業株式会社 | Dioxin generation inhibitor and method for preventing generation |
| JP2001038329A (en) * | 1999-08-04 | 2001-02-13 | Meidensha Corp | Method and facility for heat-treating subject to be treated |
| JP2001038328A (en) * | 1999-08-04 | 2001-02-13 | Meidensha Corp | Method and facility for heat-treating subject to be treated |
| JP2002035546A (en) * | 1999-09-09 | 2002-02-05 | Asahi Glass Co Ltd | Gas treatment method |
| JP4637392B2 (en) * | 2000-05-16 | 2011-02-23 | 旭硝子株式会社 | Gas processing method |
| JP2010201427A (en) * | 2000-05-16 | 2010-09-16 | Asahi Glass Co Ltd | Method of treating gas |
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| JP4918741B2 (en) * | 2000-05-17 | 2012-04-18 | 旭硝子株式会社 | Gas processing method |
| JP4826001B2 (en) * | 2000-05-31 | 2011-11-30 | 旭硝子株式会社 | Gas processing method |
| JP4667577B2 (en) * | 2000-10-11 | 2011-04-13 | 三井造船株式会社 | Exhaust gas treatment desalting agent supply amount control method, supply amount control device, and waste treatment system |
| JP2002282650A (en) * | 2001-03-26 | 2002-10-02 | Mitsui Eng & Shipbuild Co Ltd | Waste combustion exhaust gas treatment apparatus and waste treatment system |
| JP2003010633A (en) * | 2001-07-04 | 2003-01-14 | Asahi Glass Co Ltd | Gas treatment method |
| JP4756415B2 (en) * | 2001-08-03 | 2011-08-24 | 三井造船株式会社 | Gas processing method |
| JP4061902B2 (en) * | 2001-12-25 | 2008-03-19 | 旭硝子株式会社 | Method for producing porous potassium carbonate |
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| US7514060B2 (en) | 2003-06-24 | 2009-04-07 | Asahi Glass Company, Limited | Porous potassium carbonate having special pore structure and method for its production |
| JP4617934B2 (en) * | 2004-03-10 | 2011-01-26 | 旭硝子株式会社 | Reduction method of dioxins in fly ash of garbage incineration equipment |
| JP4581682B2 (en) * | 2004-12-27 | 2010-11-17 | 旭硝子株式会社 | Reduction method of dioxins in fly ash of garbage incineration equipment |
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| EP3187244A1 (en) * | 2015-12-30 | 2017-07-05 | Lhoist Recherche et Développement S.A. | Composition for the purification of flue gas |
| US11247194B2 (en) * | 2016-12-22 | 2022-02-15 | Mitsui Chemicals, Inc. | Method for producing porous molded body, method for producing catalyst for α-olefin dimerization, method for producing α-olefin dimer, porous molded body, and catalyst for α-olefin dimerization |
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| JPS61174112A (en) * | 1985-01-29 | 1986-08-05 | Ebara Corp | Treatment of incineration ash of municipal refuse |
| JPH03224618A (en) * | 1990-01-29 | 1991-10-03 | Hitachi Zosen Corp | Method for controlling generation of dioxine |
| JP3086889B2 (en) * | 1990-11-01 | 2000-09-11 | 東ソー株式会社 | Poorly water-soluble baking soda and method for producing the same |
| JPH0558622A (en) * | 1991-08-30 | 1993-03-09 | Asahi Glass Co Ltd | Consolidation inhibition method of sodium hydrogen carbonate |
| IT1269193B (en) * | 1994-01-20 | 1997-03-21 | Solvay | REACTIVE COMPOSITION AND PROCEDURE FOR THE PURIFICATION OF A GAS CONTAINING HYDROGEN CHLORIDE |
| GB9403260D0 (en) * | 1994-02-21 | 1994-04-13 | Ici Plc | Absorbents |
| JP3840858B2 (en) * | 1998-11-26 | 2006-11-01 | 旭硝子株式会社 | Acid component removal agent and acid component removal method |
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