JPH0412173B2 - - Google Patents
Info
- Publication number
- JPH0412173B2 JPH0412173B2 JP60285332A JP28533285A JPH0412173B2 JP H0412173 B2 JPH0412173 B2 JP H0412173B2 JP 60285332 A JP60285332 A JP 60285332A JP 28533285 A JP28533285 A JP 28533285A JP H0412173 B2 JPH0412173 B2 JP H0412173B2
- Authority
- JP
- Japan
- Prior art keywords
- iron
- boiler
- water
- acrylate
- polyacrylamide
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 229910052742 iron Inorganic materials 0.000 claims description 31
- 229920000642 polymer Polymers 0.000 claims description 14
- 239000002270 dispersing agent Substances 0.000 claims description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 5
- 229920000058 polyacrylate Polymers 0.000 claims description 5
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims description 3
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims description 2
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 2
- 229920001519 homopolymer Polymers 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 14
- 239000006185 dispersion Substances 0.000 description 14
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 6
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 5
- 229910021519 iron(III) oxide-hydroxide Inorganic materials 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000008234 soft water Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000001488 sodium phosphate Substances 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 2
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 2
- 235000019801 trisodium phosphate Nutrition 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006114 decarboxylation reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical class [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 150000002734 metacrylic acid derivatives Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Landscapes
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
〔産業上の利用分野〕
この発明はボイラ水中の鉄分を分散させる鉄分
散剤に関するものである。
〔従来の技術〕
ボイラ水中では、給水から持込まれる鉄分が酸
化鉄となり、これがボイラプラント中に堆積して
腐食、伝熱障害、噴破事故その他の障害を引起こ
す。
従来、20Kg／cm2以下の低圧ボイラでは、原水ま
たは軟水を給水としており、その中に含まれる鉄
分は、ボイラプラント中で、Fe2O3の形態で析出
する。そこでポリアクリル酸塩を分散剤として添
加して、Fe2O3がボイラ水中に分散した状態で系
外に排出することにより、酸化鉄のボイラプラン
ト内での堆積を防止していた。
一方、圧力が20Kg／cm2を越える中・高圧ボイラ
では、ボイラの熱負荷が高くなり、その分、給水
中の不純物により影響も大きくなることから、給
水としては純水が使用される。すなわち、ボイラ
プラント外でできる限り鉄分を除去するととも
に、復水も十分処理することによつて、鉄分自体
がボイラ内に持ち込まないようにしていた。
しかしながら、どうしても鉄分のボイラプラン
ト内への持込みが避けられず、堆積物が発生す
る。純水給水ボイラの場合、堆積物中の80〜90％
がFe3O4の形態の酸化鉄であることがわかつてい
る。
〔発明が解決しようとする問題点〕
原水・軟水給水ボイラの場合、上述のように鉄
分散剤としてポリアクリル酸塩が用いられるが、
その分散効果は実用範囲にあるものの、まだ十分
に満足できるものではない。
一方、純水給水ボイラの場合、上記のFe3O4に
よる堆積物を分散させるために、原水・軟水給水
と同じ考え方でポリアクリル酸塩を添加すると、
鉄分散効果が１〜30％程度と低いうえに、ボイラ
水のPHを上昇させ、ボイラ水の管理準備を超えて
しまうという問題点があつた。
〔問題点を解決するための手段〕
この発明では上記の問題点を解決するためのも
ので、従来のものよりも優れた鉄分散効果を有
し、これにより鉄分の堆積による障害を防止する
とともに、ボイラ水のPHを所定の値に維持するこ
とのできるボイラ水用鉄分散剤を提供することを
目的としている。
この発明は、分子量200〜100000のポリアクリ
ルアミドまたはその部分加水分解物と分子量300
〜100000のアクリル酸塩系重合体とを含むことを
特徴とするボイラ水用鉄分散剤である。
この発明において使用する第１の重合体である
アクリルアミドまたはその部分加水分解物は分子
量200〜100000、好ましくは200〜40000程度のも
のが適当である。部分加水分散物は加水分散率30
モル％以下、好ましくは25モル％以下程度が適当
であり、ナトリウム塩等の水溶性塩を使用するの
が好ましい。
第２の重合体であるアクリル酸塩系重合体はア
クリル酸塩またはメタクリル酸塩を主たる構造単
位として含む重合体である。このような重合体と
しては、アクリル酸塩もしくはメタクリル酸塩の
単独重合体、これらの共重合体、またはこれらと
ヒドロキシエチルメタクリレート、３−アリロキ
シ−２−ヒドロキシプロパンスルホン酸、もしく
は３−アリロキシ−１，２−ジヒドロキシプロパ
ン等の他の単量体との共重合体などが使用でき
る。
これらのアクリル酸塩系重合体は、アクリル酸
塩または（および）メタクリル酸塩からなる構造
単位が50モル％以上含まれ、分子量300〜100000、
好ましくは500〜40000のものが適当である。また
これらの共重合体はナトリウム塩等の水溶性塩と
して使用するのが好ましい。
ポリアクリルアミドまたはその部分加水分解物
とアクリル酸塩系重合体の配合比は、重合比で
（９：１）〜（１：９）、好ましくは（７：３）〜
（３：７）程度が適当である。
本発明のボイラ水用鉄分散剤は各成分を配合し
た状態で、または別々にボイラ水に添加し、使用
する。添加量は含まれる鉄分の量量によつて異な
るが、鉄（Feとして）１当量に対して0.1〜２当
量とし、一般的には0.1〜30mg／程度である
本発明のボイラ水用鉄分解剤は必要により他の
成分を含んでいてもよい。
〔作用〕
本発明のボイラ水用鉄分散剤の成分である上記
第１および第２の重合体はそれぞれ鉄分の分散効
果において異なつた特性を有し、それぞれ単独で
は十分な分散効果は得られない。その原因を調べ
たところ、ボイラ水に含まれる鉄分は酸化鉄
（Fe3O4）が主体であるが、同じ酸化鉄でもその
起源によつて異なつた分散特性を示すためである
ことがわかつた。ボイラ水中の酸化鉄は、給水か
ら持込まれるFeO（OH）、Fe（OH）3等の水酸化鉄
がボイラ中で加熱されることにより生成する。
ポリアクリルアミドまたはその部分加水分解物
はFeO（OH）を起源するものに対しては分散効
果が大きいが、Fe（OH）3を起源とするものに対
しては効果が小さい。またアクリル酸塩系重合体
はFe（OH）3を起源とするものに対しては分散効
果が大きいが、FeO（OH）を起源とするものに
対しては効果が小さい。そこで両者を組合せて使
用すると、いずれの酸化鉄も分散でき、こうして
起源に関係なく安定した酸化鉄の分散効果が得ら
れるとともに、各成分単独使用の場合に比べて、
組合せによる相乗的な分散効果が得られる。
一方、アクリル酸塩系重合体を単独で使用する
と、熱分散により脱炭酸が起こりボイラ水のPHが
上昇するが、ポリアクリルアミドは加水分解によ
りポリアクリル酸とアンモニアに分解し、このう
ちアンモニアは蒸気中に移行するためボイラ水の
PHは低下し、全体としてボイラ水は適正な値に維
持される。
〔発明の効果〕
以上の通り、本発明によれば、２種の重合体を
組合せて使用するので、ボイラ水中の鉄分をその
起源に関係なく分散させることができ、その分散
効果は安定しているとともに、各成分単独の場合
よりもはるかに優れた相剰効果が得られ、かつ各
成分単独の場合に変動するボイラ水のPHを適正な
値に維持できるなどの優れた効果が得られる。
〔実施例〕
以下、本発明の実施例について説明する。
実施例 １
純水にリン酸三ナトリウム20mg／、ヒドラジ
ン25mg／、FeCl3100mg／およびFeO（OH）
100mg／を添加した試験水に鉄分散剤100mg／
を添加し、PH10.5に調整してオートクレープに入
れ、280℃で24時間加熱し、冷却後試験水を取出
し、上澄液の濁度を計つて鉄分分散率を測定した
結果を表１に示す。なお本実施例においては給水
中の鉄の量を多くしてあるので、鉄分散剤の添加
量も通常よりは多い。
[Industrial Application Field] This invention relates to an iron dispersant for dispersing iron in boiler water. [Prior Art] In boiler water, iron brought in from the water supply becomes iron oxide, which accumulates in the boiler plant and causes corrosion, heat transfer problems, blowout accidents, and other problems. Conventionally, low-pressure boilers of 20 kg/cm 2 or less are supplied with raw water or soft water, and the iron contained therein is precipitated in the form of Fe 2 O 3 in the boiler plant. Therefore, by adding polyacrylate as a dispersant and discharging Fe 2 O 3 in a dispersed state in the boiler water to the outside of the system, the accumulation of iron oxide inside the boiler plant was prevented. On the other hand, in medium- and high-pressure boilers where the pressure exceeds 20 kg/cm 2 , the heat load on the boiler is high, and the effect of impurities in the water supply is correspondingly large, so pure water is used as the water supply. That is, by removing as much iron as possible outside the boiler plant and sufficiently treating condensate, the iron itself was prevented from being brought into the boiler. However, the introduction of iron into the boiler plant is unavoidable, and deposits are generated. For pure water boilers, 80-90% in the sediment
is known to be iron oxide in the form of Fe 3 O 4 . [Problems to be solved by the invention] In the case of raw water/soft water supply boilers, polyacrylate is used as an iron dispersant as described above.
Although the dispersion effect is within a practical range, it is still not fully satisfactory. On the other hand, in the case of pure water feed boilers, in order to disperse the Fe 3 O 4 deposits mentioned above, polyacrylate is added in the same way as raw water and soft water feed water.
In addition to having a low iron dispersion effect of about 1 to 30%, there was a problem in that it raised the PH of the boiler water, exceeding the boiler water management preparation. [Means for Solving the Problems] This invention is intended to solve the above problems, and has a better iron dispersion effect than conventional ones, thereby preventing problems caused by iron accumulation. The object of the present invention is to provide an iron dispersant for boiler water that can maintain the PH of boiler water at a predetermined value. This invention combines polyacrylamide with a molecular weight of 200 to 100,000 or its partial hydrolyzate with a molecular weight of 300,000
This is an iron dispersant for boiler water characterized by containing an acrylate-based polymer of ~100,000. The first polymer used in this invention, acrylamide or a partially hydrolyzed product thereof, has a molecular weight of about 200 to 100,000, preferably about 200 to 40,000. Partially hydrolyzed dispersion has a hydrodispersion rate of 30
A suitable amount is about mol% or less, preferably about 25 mol% or less, and it is preferable to use a water-soluble salt such as a sodium salt. The acrylate-based polymer, which is the second polymer, is a polymer containing acrylate or methacrylate as a main structural unit. Such polymers include homopolymers of acrylates or methacrylates, copolymers thereof, or combinations thereof with hydroxyethyl methacrylate, 3-allyloxy-2-hydroxypropanesulfonic acid, or 3-allyloxy-1 , copolymers with other monomers such as 2-dihydroxypropane, etc. can be used. These acrylate-based polymers contain 50 mol% or more of structural units consisting of acrylate or (and) methacrylate, and have a molecular weight of 300 to 100,000.
Preferably, 500 to 40,000 is appropriate. Further, these copolymers are preferably used as water-soluble salts such as sodium salts. The blending ratio of polyacrylamide or its partial hydrolyzate and acrylate polymer is (9:1) to (1:9), preferably (7:3) to
(3:7) is appropriate. The iron dispersant for boiler water of the present invention is used with each component mixed together or by adding them separately to boiler water. The amount added varies depending on the amount of iron contained, but it is 0.1 to 2 equivalents per equivalent of iron (as Fe), and generally about 0.1 to 30 mg/decomposition of iron for boiler water according to the present invention. The agent may contain other ingredients if necessary. [Function] The first and second polymers, which are components of the iron dispersant for boiler water of the present invention, each have different characteristics in terms of iron dispersion effect, and a sufficient dispersion effect cannot be obtained by using each polymer alone. When we investigated the cause of this, we found that the iron content in boiler water is mainly iron oxide (Fe 3 O 4 ), but even the same iron oxide exhibits different dispersion characteristics depending on its origin. . Iron oxide in boiler water is generated when iron hydroxides such as FeO(OH) and Fe(OH) 3 brought in from the water supply are heated in the boiler. Polyacrylamide or its partial hydrolyzate has a large dispersion effect on substances originating from FeO(OH), but has a small effect on substances originating from Fe(OH) 3 . Furthermore, acrylate-based polymers have a large dispersion effect on materials originating from Fe(OH) 3 , but have a small effect on materials originating from FeO(OH). Therefore, when the two are used in combination, any type of iron oxide can be dispersed, and thus a stable iron oxide dispersion effect can be obtained regardless of the origin, and compared to when each component is used alone,
A synergistic dispersion effect can be obtained by the combination. On the other hand, when an acrylate-based polymer is used alone, thermal dispersion causes decarboxylation and increases the PH of the boiler water, but polyacrylamide decomposes into polyacrylic acid and ammonia through hydrolysis, of which ammonia is vaporized. of boiler water to migrate into
PH is reduced and overall boiler water is maintained at a proper value. [Effects of the Invention] As described above, according to the present invention, since two types of polymers are used in combination, iron in boiler water can be dispersed regardless of its origin, and the dispersion effect is stable. At the same time, a much superior synergistic effect can be obtained than when each component is used alone, and excellent effects such as being able to maintain the fluctuating PH of boiler water at an appropriate value can be obtained when each component is used alone. [Examples] Examples of the present invention will be described below. Example 1 Trisodium phosphate 20mg/, hydrazine 25mg/, FeCl 3 100mg/ and FeO(OH) in pure water
Iron dispersant 100mg/ to the test water to which 100mg/
was added, adjusted to pH 10.5, placed in an autoclave, heated at 280℃ for 24 hours, removed the test water after cooling, and measured the turbidity of the supernatant to measure the iron dispersion rate. Table 1 shows the results. Shown below. In this example, since the amount of iron in the water supply was increased, the amount of iron dispersant added was also larger than usual.
【表】【table】
【表】
実施例 ２
試験用ボイラに、純水にリン酸三ナトリウム１
mg／、ヒドラジン12mg／、およびFeとして
５mg／となるようにFeCl3とFeO（OH）とを等
量添加したものを給水として供給し、運転圧力80
Kg／cm2、濃縮倍数40倍で運転し、45時間後にボイ
ラを開缶して伝熱面の鉄分付着量を測定した。こ
のときの総給水量は730であつた。次に、実施
例１で用いたＢ（ポリアクリルアミド）、Ａ（ポリ
アクリル酸ナトリウム）、およびＡ＋Ｂを順次添
加して上記と同様の試験を行つた。
各薬剤の添加量および結果を表２に示す。[Table] Example 2 Add 1 part of trisodium phosphate to pure water in a test boiler.
FeCl 3 and FeO(OH) were added in equal amounts to give 5 mg/mg/hydrazine, 12 mg/hydrazine, and 5 mg/Fe as feed water, and the operating pressure was 80
Kg/cm 2 and the concentration factor was 40 times. After 45 hours, the boiler was opened and the amount of iron deposited on the heat transfer surface was measured. The total amount of water supplied at this time was 730. Next, B (polyacrylamide), A (sodium polyacrylate), and A+B used in Example 1 were sequentially added to conduct the same test as above. Table 2 shows the amount of each drug added and the results.
【表】
以上の結果により、各成分を併用した場合は単
独使用した場合よりもはるかに高い鉄分分散率が
得られ、PHも安定していることがわかる。[Table] The above results show that when each component is used in combination, a much higher iron dispersion rate is obtained than when used alone, and the pH is also stable.
Claims (1)
たはその部分加水分解物と、分子量300〜100000
のアクリル酸塩系重合体とを含むことを特徴とす
るボイラ水用鉄分散剤。 ２ ポリアクリルアミドまたはその部分加水分解
物とアクリル酸塩系重合体の重量比が（９：１）
〜（１：９）である特許請求の範囲第１項記載の
鉄分散剤。 ３ アクリル酸塩系重合体がアクリル酸塩もしく
はメタクリル酸塩の単独重合体、これらの共重合
体、またはこれらとヒドロキシエチルメタクリレ
ート、３−アリロキシ−２−ヒドロキシプロパン
スルホン酸もしくは３−アリロキシ−１，２−ジ
ヒドロキシプロパンとの共重合体である特許請求
の範囲第１項または第２項記載の鉄分散剤。 ４ ボイラが純水給水ボイラである特許請求の範
囲第１項ないし第３項のいずれかに記載の鉄分散
剤。[Claims] 1. Polyacrylamide or its partial hydrolyzate with a molecular weight of 200 to 100,000 and a molecular weight of 300 to 100,000
An iron dispersant for boiler water, characterized in that it contains an acrylate-based polymer. 2 The weight ratio of polyacrylamide or its partial hydrolyzate and acrylate polymer is (9:1)
The iron dispersant according to claim 1, wherein the ratio is 1:9. 3. The acrylate-based polymer is a homopolymer of acrylate or methacrylate, a copolymer thereof, or a combination thereof with hydroxyethyl methacrylate, 3-allyloxy-2-hydroxypropanesulfonic acid, or 3-allyloxy-1, The iron dispersant according to claim 1 or 2, which is a copolymer with 2-dihydroxypropane. 4. The iron dispersant according to any one of claims 1 to 3, wherein the boiler is a pure water supply boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60285332A JPS62144741A (en) | 1985-12-18 | 1985-12-18 | Iron dispersant for boiler water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60285332A JPS62144741A (en) | 1985-12-18 | 1985-12-18 | Iron dispersant for boiler water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62144741A JPS62144741A (en) | 1987-06-27 |
| JPH0412173B2 true JPH0412173B2 (en) | 1992-03-03 |
Family
ID=17690175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60285332A Granted JPS62144741A (en) | 1985-12-18 | 1985-12-18 | Iron dispersant for boiler water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62144741A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4645978B2 (en) * | 2001-01-24 | 2011-03-09 | 栗田工業株式会社 | Scale inhibitor |
| JP5903953B2 (en) * | 2012-03-15 | 2016-04-13 | 栗田工業株式会社 | Iron scale inhibitor and method for preventing steam generator |
| JP5776734B2 (en) * | 2013-07-04 | 2015-09-09 | 栗田工業株式会社 | Iron scale inhibitor and method for preventing iron scale of steam generating equipment using the same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5086489A (en) * | 1973-12-05 | 1975-07-11 | ||
| JPS5426974A (en) * | 1977-08-01 | 1979-02-28 | Chemed Corp | Method of dispersing composition and high polymer |
| JPS57113897A (en) * | 1980-11-18 | 1982-07-15 | Deiaaboon Chem Ltd | Method of dispersing granular substance in aqueous system |
| JPS5951967A (en) * | 1982-09-17 | 1984-03-26 | Yoshiro Abe | Sequestering agent |
| JPS59189998A (en) * | 1983-04-12 | 1984-10-27 | ケメツド・コ−ポレ−シヨン | Scale removing method |
-
1985
- 1985-12-18 JP JP60285332A patent/JPS62144741A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5086489A (en) * | 1973-12-05 | 1975-07-11 | ||
| JPS5426974A (en) * | 1977-08-01 | 1979-02-28 | Chemed Corp | Method of dispersing composition and high polymer |
| JPS57113897A (en) * | 1980-11-18 | 1982-07-15 | Deiaaboon Chem Ltd | Method of dispersing granular substance in aqueous system |
| JPS5951967A (en) * | 1982-09-17 | 1984-03-26 | Yoshiro Abe | Sequestering agent |
| JPS59189998A (en) * | 1983-04-12 | 1984-10-27 | ケメツド・コ−ポレ−シヨン | Scale removing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62144741A (en) | 1987-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |