JP2931766B2 - Aggregating hydrophobic agent - Google Patents
Aggregating hydrophobic agentInfo
- Publication number
- JP2931766B2 JP2931766B2 JP6311662A JP31166294A JP2931766B2 JP 2931766 B2 JP2931766 B2 JP 2931766B2 JP 6311662 A JP6311662 A JP 6311662A JP 31166294 A JP31166294 A JP 31166294A JP 2931766 B2 JP2931766 B2 JP 2931766B2
- Authority
- JP
- Japan
- Prior art keywords
- composition
- hydrophobic agent
- agglomerated
- present
- incorporated
- 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.)
- Expired - Lifetime
Links
- 230000002209 hydrophobic effect Effects 0.000 title claims description 9
- 230000004931 aggregating effect Effects 0.000 title claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical group S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 239000004480 active ingredient Substances 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- 230000004523 agglutinating effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000005345 coagulation Methods 0.000 description 6
- 230000015271 coagulation Effects 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 239000000701 coagulant Substances 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- -1 aluminum ion Chemical class 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 239000002563 ionic surfactant Substances 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- HFCSXCKLARAMIQ-UHFFFAOYSA-L disodium;sulfate;hydrate Chemical class O.[Na+].[Na+].[O-]S([O-])(=O)=O HFCSXCKLARAMIQ-UHFFFAOYSA-L 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Description
【産業上の利用分野】この発明は、凝集疎水剤に関する
ものである。さらに詳しくは、この発明は、有機汚泥や
汚濁水の処理によって水と固形分とを分離処理するのに
有用な、新しい凝集疎水剤に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aggregating hydrophobic agent. More specifically, the present invention relates to a novel flocculating hydrophobic agent useful for separating water and solids by treating organic sludge and polluted water.
【従来の技術とその課題】従来より、産業廃棄物や汚泥
処理等においては、水と固形分とを効果的に分離し、洗
浄水の取出しと、固形廃棄物の分別を行うための凝集剤
が使用されてきている。そして、これらの凝集剤として
は、これまでにも各種の成分組成からなるものが知られ
ているが、その代表的なものとしては、高分子系凝集剤
のアクリルアミド系のものやアクリル酸ソーダ系のもの
等が知られている。また、無機系のものとしても、アル
ミナ・シリカ系のもの等も知られている。しかしなが
ら、これまでに知られている凝集剤の場合には、その脱
水凝集作用は必ずしも満足できるものでなく、凝集速度
が遅く、水分と固形分との分離が充分でないという欠点
があった。また、従来の凝集剤の場合には、水分と分離
した固形分が再度水と接触するとコロイド状に分散して
しまい凝集状態が破壊されるという問題があった。そこ
で、このような従来の欠点を解消するものとして、凝集
分離効果が顕著であって、しかも分離した固形分の凝集
状態が水分によって破壊されることもない、新しい、凝
集剤の実現が望まれていた。この発明は、以上の通りの
事情に鑑みてなされたものであって、上記の通りの凝集
分離作用に優れ、しかも固形分の凝集固定作用も良好な
凝集剤を提供することを目的としている。2. Description of the Related Art Conventionally, in the treatment of industrial waste and sludge, a flocculant for effectively separating water and solids, taking out washing water and separating solid wastes. Has been used. As these flocculants, those composed of various component compositions have been known so far, and representative examples thereof include acrylamide-based polymer coagulants and sodium acrylate-based flocculants. Are known. Also, as the inorganic type, an alumina / silica type is known. However, in the case of the coagulants known hitherto, their dehydration and coagulation effects are not always satisfactory, and the coagulation speed is slow, and there is a drawback that the separation of water and solids is not sufficient. Further, in the case of the conventional coagulant, there is a problem that when the solid content separated from water is brought into contact with water again, the solid content is dispersed in a colloidal state and the coagulated state is destroyed. Therefore, as a solution to such a conventional drawback, realization of a new flocculant which has a remarkable flocculation / separation effect and does not destroy the flocculated state of the separated solid content by water is desired. I was The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flocculant which is excellent in the flocculation / separation effect as described above and also has a favorable flocculation and fixation effect of solids.
【課題を解決するための手段】この発明は、上記の課題
を解決するものとして、凝集活性成分が重量百分率で、 硫酸第二鉄 ２〜１５ 硫酸ナトリウム ５〜１５ ポリ塩化アルミニウム ２０〜６０ ポリ硫酸第二鉄 ３〜１０ 酸化珪素 ５〜２５ ５〜４０％希硫酸 ５〜２５ の組成物を含有する水溶液からなることを特徴とする凝
集疎水剤を提供する。また、この発明は、上記の組成に
加えて、珪酸塩、アルミン酸塩が組成物の０．０１〜５
％配合されている凝集疎水剤をも提供する。さらにま
た、この発明においては、塩化マグネシウムが５〜２０
％で配合されていることもや、水溶液濃度が５〜４０％
であることも、その態様としている。According to the present invention, there is provided a method for solving the above-mentioned problems, wherein the coagulation active ingredient is expressed by weight percentage, and ferric sulfate 2-15 sodium sulfate 5-15 polyaluminum chloride 20-60 polysulfuric acid The present invention provides an agglomerated hydrophobizing agent comprising an aqueous solution containing a composition of ferric 3-10 silicon oxide 5-25 5-40% diluted sulfuric acid 5-25. In addition, the present invention provides a composition in which a silicate or an aluminate is contained in an amount of 0.01 to 5 in addition to the above composition.
Also provided is an agglomerated hydrophobizing agent which is formulated in a%. Furthermore, in the present invention, magnesium chloride is 5 to 20.
% And the aqueous solution concentration is 5-40%
Is also an aspect of this.
【作用】この発明は、上記の組成とすることにより、よ
り速い凝集とより効率的な水分と固形分との分離性を実
現する。また、分離された固形分は、水分と接触しても
容易には再分散しない。つまり優れた固定作用が実現さ
れる。さらに個々の成分の作用について説明すると、以
下の通り詳述される。ポリ塩化アルミニウム 水和反応により多価性アルミニウムイオンが生成され、
有効な電荷中和イオンとして働きコロイド粒子を電荷的
に中和吸着して凝集効果を発揮する。硫酸第二鉄、ポリ硫酸第二鉄 水和反応により凝集、沈降、疎水（脱水）性のある酸化
イオンが生成される。特に沈降性が早く重金属、ヘキサ
ン等の除去、ＣＯＤ、ＢＯＤの低下、脱臭効果等に大変
重要な反応をする。同時に硫酸が生成され、その反応を
停止するためには、中和剤としてマグネシウム、ナトリ
ウム、カリウム等を加える。硫酸ナトリウム 水和反応により水酸化物となり、凝集作用と共にイオン
界面活性剤が生成され、粒子の電荷を中和し粒子が完全
に疎水化され、水酸化塩作用によりコロイド電価二重層
の厚さが薄くなり粒子相互が吸引し大きな粒子となる。
尚硫酸イオンの中和作用もする。塩化マグネシウム 水和反応により水酸化物となり、凝集作用と共にイオン
界面活性剤が生成され、粒子の電荷を中和し粒子が完全
に疎水化され、水酸化塩作用によりコロイド電荷二重層
の厚さが薄くなり粒子相互が吸引し大きな粒子となる。
尚硫酸イオンの中和作用もする。珪酸塩 アルミノシリケート、ゼオライト等のイオン交換能力か
ら各イオンの活性を強力にし、酸性イオン、アルカリイ
オン等の弊害を防止すると共に上澄水の透明度を最良に
する。アルミン酸塩 ナトリウム、カリウム等の塩は、水和反応により水酸化
アルミニウムが生成され、硫酸を中和し酸化アルミニウ
ムの凝集力と相互反応効果を高める。希硫酸 各種薬剤の溶解剤として使用する。以下、実施例を示
し、さらに詳しくこの発明について説明する。もちろ
ん、この発明は、以下の実施例によって限定されるもの
ではない。According to the present invention, faster aggregation and more efficient separation of water and solids can be realized by using the above composition. Further, the separated solid does not easily redisperse even when it comes into contact with moisture. That is, an excellent fixing action is realized. The action of each component will be described in detail below. Polyvalent aluminum ion is generated by polyaluminum chloride hydration reaction,
It acts as an effective charge neutralizing ion and neutralizes and adsorbs the colloidal particles in charge, thereby exhibiting an aggregation effect. Aggregation, sedimentation, and hydrophobic (dehydration) oxide ions are generated by the ferric sulfate and ferric polysulfate hydration reaction. In particular, it has a fast sedimentation property, and is very important for removing heavy metals, hexane, etc., reducing COD and BOD, and deodorizing effects. Simultaneously, sulfuric acid is generated, and in order to stop the reaction, magnesium, sodium, potassium or the like is added as a neutralizing agent. The sodium sulfate hydrates to form a hydroxide, which produces an ionic surfactant with coagulation, neutralizes the charge of the particles, and completely hydrophobizes the particles. Becomes thin, and the particles are attracted to each other to become large particles.
It also acts to neutralize sulfate ions. The magnesium chloride becomes a hydroxide by hydration reaction, an ionic surfactant is generated together with the coagulation action, neutralizes the charge of the particles, completely hydrophobizes the particles, and the thickness of the colloidal charge double layer is reduced by the action of hydroxide salt. The particles become thinner and attract each other to become larger particles.
It also acts to neutralize sulfate ions. It enhances the activity of each ion from the ion exchange capacity of silicate aluminosilicate, zeolite, etc., prevents the harmful effects of acidic ions, alkali ions, etc. and optimizes the transparency of the supernatant water. Salts such as sodium and potassium aluminates generate aluminum hydroxide by a hydration reaction, neutralize sulfuric acid, and increase the cohesive force of aluminum oxide and the interaction effect. Used as a dissolving agent for various sulfuric acid chemicals. Hereinafter, the present invention will be described in more detail with reference to Examples. Of course, the present invention is not limited by the following embodiments.
【実施例】表１の組成からなる凝集疎水剤を含水率１２
００％汚泥スラリーに添加した。また比較のために市販
のアクリルアミド系高分子凝集剤も別途添加した。EXAMPLE An agglomerated hydrophobic agent having the composition shown in Table 1 was mixed with a water content of 12%.
Added to the 00% sludge slurry. For comparison, a commercially available acrylamide polymer flocculant was also separately added.
【表１】 この発明の凝集疎水剤の場合と、高分子凝集剤との場合
についてその作用効果を比較すると、次の表２の通り、
この発明のものは極めて優れていた。[Table 1] When the effects of the aggregating hydrophobic agent of the present invention and that of the polymeric aggregating agent are compared, as shown in Table 2 below,
The one of the present invention was extremely excellent.
【表２】 [Table 2]
【発明の効果】この発明により、以上詳しく説明した通
り、汚泥、汚染物の脱水凝集による分離が速やかに進行
し、脱水性も極めて良好となる。According to the present invention, as described in detail above, the separation of sludge and contaminants by dehydration and coagulation progresses rapidly, and the dewaterability is extremely improved.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−290204（ＪＰ，Ａ) 特開 昭57−171487（ＪＰ，Ａ) 特開 昭48−20786（ＪＰ，Ａ) 特開 昭49−128886（ＪＰ，Ａ) 特開 昭56−76293（ＪＰ，Ａ) 特開 昭61−149291（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B01D 21/01 C02F 1/52 C02F 11/14 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-290204 (JP, A) JP-A-57-171487 (JP, A) JP-A-48-20786 (JP, A) JP-A-49-1979 128886 (JP, A) JP-A-56-76293 (JP, A) JP-A-61-149291 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B01D 21/01 C02F 1 / 52 C02F 11/14
Claims (5)
集疎水剤。1. An agglutinating active ingredient, by weight percentage, is ferric sulfate 2-15 sodium sulfate 5-15 polyaluminum chloride 20-60 polyferric sulfate 3-10 silicon oxide 5-25 5-40% dilute An agglomerated hydrophobic agent comprising an aqueous solution containing a composition of sulfuric acid 5 to 25.
０％の割合で組成物に配合されている請求項１の凝集疎
水剤。2. Magnesium chloride having a weight percentage of 5-2.
The agglomerated hydrophobizing agent according to claim 1, which is incorporated in the composition at a rate of 0%.
割合で組成物に配合されている請求項１または２の凝集
疎水剤。3. The agglomerated hydrophobizing agent according to claim 1, wherein the silicate is incorporated in the composition in a ratio of 0.01 to 5% by weight.
５％の割合で組成物に配合されている請求項１または２
の凝集疎水剤。4. An aluminate having a weight percentage of 0.01 to 0.01%.
3. The composition according to claim 1, which is incorporated in the composition at a ratio of 5%.
Aggregating hydrophobic agent.
１ないし４のいずれかの凝集疎水剤。5. The agglomerated hydrophobic agent according to claim 1, wherein the concentration of the aqueous solution is 5 to 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6311662A JP2931766B2 (en) | 1994-12-15 | 1994-12-15 | Aggregating hydrophobic agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6311662A JP2931766B2 (en) | 1994-12-15 | 1994-12-15 | Aggregating hydrophobic agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08168609A JPH08168609A (en) | 1996-07-02 |
| JP2931766B2 true JP2931766B2 (en) | 1999-08-09 |
Family
ID=18019981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6311662A Expired - Lifetime JP2931766B2 (en) | 1994-12-15 | 1994-12-15 | Aggregating hydrophobic agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2931766B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102745787A (en) * | 2012-06-29 | 2012-10-24 | 武汉钢铁(集团)公司 | Fast flocculating agent and its preparation method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8163668B2 (en) * | 2006-03-17 | 2012-04-24 | Kayohiko Tanimoto | Inorganic electrolyte setting agent capable of rendering heavy metal ion nonhazardous and method of treatment for utilization as resource therewith |
| CN103030200A (en) * | 2013-01-09 | 2013-04-10 | 杨祺 | Method for producing poly-silicon rare earth chloride sulfate aluminum iron by using rare earth-containing sludge and electroplated and pickled acid-containing sewage |
| JP6330186B2 (en) * | 2013-07-22 | 2018-05-30 | 株式会社片山化学工業研究所 | Zinc-containing waste liquid treatment agent |
-
1994
- 1994-12-15 JP JP6311662A patent/JP2931766B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102745787A (en) * | 2012-06-29 | 2012-10-24 | 武汉钢铁(集团)公司 | Fast flocculating agent and its preparation method |
| CN102745787B (en) * | 2012-06-29 | 2014-01-01 | 武汉钢铁(集团)公司 | Fast flocculating agent and its preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08168609A (en) | 1996-07-02 |
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