JPS5912799A - Antiscaling agent - Google Patents

Antiscaling agent

Info

Publication number
JPS5912799A
JPS5912799A JP57121349A JP12134982A JPS5912799A JP S5912799 A JPS5912799 A JP S5912799A JP 57121349 A JP57121349 A JP 57121349A JP 12134982 A JP12134982 A JP 12134982A JP S5912799 A JPS5912799 A JP S5912799A
Authority
JP
Japan
Prior art keywords
acid
water
sodium
boiler
scale
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.)
Granted
Application number
JP57121349A
Other languages
Japanese (ja)
Other versions
JPS6248560B2 (en
Inventor
Takashi Okamoto
俊 岡本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurita Water Industries Ltd
Original Assignee
Kurita Water Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kurita Water Industries Ltd filed Critical Kurita Water Industries Ltd
Priority to JP57121349A priority Critical patent/JPS5912799A/en
Publication of JPS5912799A publication Critical patent/JPS5912799A/en
Publication of JPS6248560B2 publication Critical patent/JPS6248560B2/ja
Granted legal-status Critical Current

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  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

PURPOSE:To suppress the formation of scale derived from zincic ion in the aqueous system of a boiler, by using one or more compounds selected from phosphonic and alpha-amino carboxylic acids or these water-coluble salts as the antiscaling agent. CONSTITUTION:One or more compounds selected from phosphonic acid or its water-soluble salts, e.g. ethylene diamine tetramethyl phosphonic acid or its sodium and potassium salts, and alpha-amino carboxylic acids or their water-soluble salts, e.g. amino acetic and imino diacetic acids or these sodium and potassium salts, are used as the antiscaling agent. This antiscaling agent exhibits the effect to inhibit scale by adding its predetermined amount to water supplied to a boiler. Its addition amount is different in response to the concentration of zinc in the water supplied to the boiler, but ordinarily at 0.1-1000ppm, pref. at 10- 100ppm.

Description

【発明の詳細な説明】 従来から、亜鉛びき鋼管(内表面が亜鉛メッキされた鋼
管)は、防食を目的として水道配管用に供されていたが
、最近、入手し易いという点から、ボイラ復水回収系に
も多用されるようになってきた。
[Detailed Description of the Invention] Conventionally, galvanized steel pipes (steel pipes whose inner surfaces are galvanized) have been used for water piping for the purpose of corrosion prevention, but recently they have been used for boiler recovery because they are easily available. It has also come to be widely used in water recovery systems.

しかしながら、この配管をボイラ穣水回収系に用いた場
合には、水中へ溶出する亜鉛イオンの作用により、以下
のような問題が生ずる。
However, when this piping is used in a boiler waste water recovery system, the following problems occur due to the effects of zinc ions eluted into the water.

即ち、オイルショック以後、省エネルギ一対策の一環と
して、復水回収率の増大及び濃縮倍率の増大(通常、1
0〜15倍)が図られているが、この際、溶出した亜鉛
イオンを多量に含む復水が再度給水として供給され、し
かも、ブロー率が低く(#縮率が高く)設定されるため
、亜鉛イオンと給水中に存在するシリカ等とが反応して
ケイ素亜鉛、塩基性炭酸亜鉛、水酸化亜鉛等のスケール
を生成し、これらが大量にボイラ内に付着する。
In other words, after the oil crisis, as part of energy-saving measures, increases in condensate recovery rate and concentration ratio (usually 1
0 to 15 times), but at this time, the condensate containing a large amount of eluted zinc ions is supplied again as water supply, and the blow rate is set low (#shrinkage rate is high). Zinc ions react with silica and the like present in the water supply to produce scales such as zinc silicon, basic zinc carbonate, and zinc hydroxide, which adhere in large quantities to the inside of the boiler.

その結果、熱交換率の低下、配管の閉塞、熱交換器の閉
塞に基づく暴発等の不都合な事態を招来するおそれがあ
った。同様の問題は、従来から使用されている亜鉛含有
合金(例えば、アルミニウム黄銅)を材質とじ7Cyf
イラ用配管についてもみられ友。
As a result, there is a risk of causing inconvenient situations such as a decrease in heat exchange efficiency, blockage of piping, and explosion due to blockage of the heat exchanger. A similar problem is caused by the use of conventionally used zinc-containing alloys (e.g. aluminum brass) and 7Cyf.
Also see about the piping for Ira.

従って、ボイラ復水回収系に亜鉛ひき鋼管を適用し友場
合には、上記し友不都合を解消しなければならないにも
かかわらず、現在迄、ボイラ水中の亜鉛イオンに起因す
るスケール発生の抑制策は何ら講じられていなかつt。
Therefore, when galvanized steel pipes are applied to boiler condensate recovery systems, the above-mentioned disadvantages must be resolved. No measures have been taken and t.

本発明は、ボイラ給水に添加して、ボイラ水系内の亜鉛
イオンに起因するスケールの生成を抑制せしめる新規な
スケール防止剤を提供することを目的とする。
An object of the present invention is to provide a novel scale inhibitor that can be added to boiler feed water to suppress the formation of scale caused by zinc ions in the boiler water system.

本発明のスケール防止剤は、ホスホン酸、α−アミノカ
ルボン酸、又はそれらの水溶性塩から選ばれる1種もし
くは2種以上の化合物から成るこ本発明のホスホン酸も
しくはその水溶性塩としては、下記の如き式(1) 、
 (ffl 、(2)、飴で示される化合物もしくは塩
が例示される。
The scale inhibitor of the present invention comprises one or more compounds selected from phosphonic acid, α-aminocarboxylic acid, or a water-soluble salt thereof. The phosphonic acid or water-soluble salt thereof of the present invention includes: Formula (1) as below,
(ffl, (2), a compound or salt represented by candy is exemplified.

式(I): (式中、Xx−X3及ヒYs〜Ysld、 各k 、 
同一モL <は異なっていてもよく、水素原子、炭素数
1〜5の低級アルキル基を表わし;z1〜z6は、各々
、同一もしくは異なっていてもよく、水素原子、アルカ
リ金属原子、アンモニウムを表わす。)上記(1)式で
表わされるホスホン酸もしくはその水溶性塩として社1
次のものが例示される。
Formula (I): (wherein, Xx-X3 and Ys to Ysld, each k,
The same moles < may be different and represent a hydrogen atom or a lower alkyl group having 1 to 5 carbon atoms; z1 to z6 may each be the same or different and represent a hydrogen atom, an alkali metal atom, or ammonium; represent. ) As the phosphonic acid represented by the above formula (1) or its water-soluble salt, Company 1
Examples include:

(1)アミノトリメチルホスホン酸及びそのナトリウム
、カリウム、アンモニウム塩 (2)アミノジメチルホスホモノエチルホスホン酸及び
そのナトリウム、カリウム、アンモニウム塩 式(U); 〔式中、R,1,R2及びlも、は、各々、同一もしく
は異なっていてもよく、次の基(A): (xl、yl、zl及びZ2は、前記(D式の場合と同
じ意味を有する。) を表わし;lちは、上記した基(3)、炭素数1〜5の
低級アルキル基を表わし;nは1〜3の整数を表わす。
(1) Aminotrimethylphosphonic acid and its sodium, potassium, and ammonium salts (2) Aminodimethylphosphomonoethylphosphonic acid and its sodium, potassium, and ammonium salts Formula (U); [In the formula, R, 1, R2, and l are also , each of which may be the same or different, represents the following group (A): (xl, yl, zl and Z2 have the same meanings as in the case of formula D); The above group (3) represents a lower alkyl group having 1 to 5 carbon atoms; n represents an integer of 1 to 3.

〕 上記叩式で表わされるホスホン酸もしくはその水溶性塩
としては、次のものが例示される。−(1)  エチレ
ンジアミンテトラメチルホスホン?i9及びそのナトリ
ウム、カリウム、アンモニウム塩(2)  ジエチレン
トリアミンペンタメチルホスホン酸及びそのナトリウム
、カリウム、アンモニウム塩 (3)トリエチレンテトラアミンヘキサメチルホスホン
酸及びそのナトリウム、カリウム、アンモニウム塩 式eD: (式中、Xは水素原子、炭素数1〜5の低級アルキル基
を表わし;Yは水素原子、炭素数1〜5の低級アルキル
基、水酸基、アンモニウムを表わし;z1〜Z4は前記
中成の場合と同じ意味を有する。)上記(IID式で表
わされるホスホン酸もしくはその水溶性塩としては1次
のものが例示される。
] Examples of the phosphonic acid or its water-soluble salt represented by the above formula include the following. -(1) Ethylenediaminetetramethylphosphone? i9 and its sodium, potassium, and ammonium salts (2) Diethylenetriaminepentamethylphosphonic acid and its sodium, potassium, and ammonium salts (3) Triethylenetetraaminehexamethylphosphonic acid and its sodium, potassium, and ammonium salts Formula eD: (wherein, represents a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms; Y represents a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms, a hydroxyl group, or ammonium; z1 to Z4 have the same meanings as in the case of intermediate ) The phosphonic acid represented by the formula (IID) or its water-soluble salt is exemplified by the primary one.

(1)  ヒドロキシェチリデンジホスホン酸及びその
ナトリウム、カリウム、アンモニウム塩(2)  ヒド
ロキシェチリデンジホスホン酸及びそのナトリウム、カ
リウム、アンモニウム塩式ω: Z4 ■ (式中、 )L、〜鳥は、各々、同一もしくは異ってい
てもよく、水素原子、炭素数1〜5の低級アルキル基、
カルボキシル基を表わし;Xl−X、及びZl。
(1) Hydroxyethylidene diphosphonic acid and its sodium, potassium, and ammonium salts (2) Hydroxyethylidene diphosphonic acid and its sodium, potassium, and ammonium salts Formula ω: Z4 ■ (In the formula, )L, ~ Bird is, Each may be the same or different, a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms,
Represents a carboxyl group; Xl-X, and Zl.

為は前記(I)式の場合と同じ廟味を有する。)上記U
式で表わされるホスホン酸もしくはその水溶性塩として
は、次のものが例示できる。
The formula has the same elegance as the formula (I) above. ) Above U
Examples of the phosphonic acid represented by the formula or its water-soluble salt include the following.

(1)  1.2.4−)ジカルボキシブタン−2−ホ
スホン酸及びそのナトリウム、カリウム、アンモニウム
塩 (2)1.2−ジカルボキシブタン−2−ホスホン酸及
びそのナトリウム、カリウム、アンモニウム塩 (3)1.2.4〜トリカルyKキシヘキザン−1−ホ
スホン酸及びそのナトリウム、カリウム、アンモニウム
塩 本発明のα−アミノカルボン酸もしくはその水溶性塩と
しては、下肥の如き弐菌、帥で示される化合物もしくは
塩が例示される。
(1) 1.2.4-) dicarboxybutane-2-phosphonic acid and its sodium, potassium, ammonium salts (2) 1.2-dicarboxybutane-2-phosphonic acid and its sodium, potassium, ammonium salts ( 3) 1.2.4~tricalyKxyhexane-1-phosphonic acid and its sodium, potassium, ammonium salts The α-aminocarboxylic acid or its water-soluble salt of the present invention may be used as Examples include compounds or salts.

式M: (式中、X、 、 X2は各々同一もしくは異なってい
てモヨく、11. 、− CI■、 −CH2−、OH
1−rcヒバ−C)(2℃002゜を表わしHzl、 
7,2は前記(I)式の場合と同じ意味を有する。) 上記■)式で表わされるα−アミノカルボン酸もしくは
その水溶性塩としては、アミン酢酸、イミノジ酢酸、N
−(β−ヒドロキシエチル)−アミノジ酢酸、N、N−
ジー(β−ヒドロキシェf)L)−グ’)シン、ニトリ
ロトリ酢酸もしくはそれらのナトリウム、カリウム、ア
ンモニウム塩が例示される。
Formula M: (wherein, X, , X2 are each the same or different, 11. , -CI■, -CH2-, OH
1-rc Hiber-C) (representing 2°C 002° Hzl,
7,2 has the same meaning as in the case of formula (I) above. ) The α-aminocarboxylic acid or its water-soluble salt represented by the above formula (■) includes amineacetic acid, iminodiacetic acid, N
-(β-hydroxyethyl)-aminodiacetic acid, N,N-
Examples include di(β-hydroxyf)L)-g')sine, nitrilotriacetic acid, and their sodium, potassium, and ammonium salts.

式Ml: (式中Xr 、 X2 、 X3及びX4は、各々同一
もしくは異なっていてもよ(、−CH2−Cl□−OH
,−Cl□−CQOZlを表わし、nは1〜3の整数を
表わし、zlは前記(1式の場合と同じ意味を有する。
Formula Ml: (in the formula, Xr, X2, X3 and X4 may each be the same or different (, -CH2-Cl□-OH
, -Cl□-CQOZl, n represents an integer of 1 to 3, and zl has the same meaning as in the case of formula (1).

) 前記M式で表わされるα−アミノカルボン酸もしくはそ
の水溶性塩としては、エチレンジアミントリ酢酸、N−
(β−ヒドロキシエチル)−エチレンジアミントリ酢酸
、ジエチレントリアミンペンタ酢酸、トリエチレンテト
ラミンヘキサ酢酸もしくはそれらのナトリウム、カリウ
ム、アンモニウム塩が例示される。
) The α-aminocarboxylic acid represented by the above formula M or its water-soluble salt includes ethylenediaminetriacetic acid, N-
Examples include (β-hydroxyethyl)-ethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, and their sodium, potassium, and ammonium salts.

本発明の防止剤は、ボイラ給水に所足童添加されて、ス
ケール防止効果を発揮する。その添加量は、ボイラ水中
の亜鉛濃度によって異なるが、a常帆1〜11000p
p、好ましくは10〜1100ppの範囲に設足される
。0.1 ppm未満の場合には、亜鉛スケールに対す
る側鎖作用が不十分となり。
The inhibitor of the present invention exhibits a scale prevention effect when added to boiler feed water as needed. The amount added varies depending on the zinc concentration in the boiler water, but it is from 1 to 11,000 p
p, preferably in the range of 10 to 1100 pp. If it is less than 0.1 ppm, the side chain effect on zinc scale will be insufficient.

1000 ppmを超える場合には効果がI獣ぼ一定し
If it exceeds 1000 ppm, the effect is almost constant.

不経済となる。ボイラ給水に添加するに際しては、本発
明の防止剤を、単独でもしくは2穐以上適宜に混合して
添加してもよい。また、こjLらを水に溶解して水溶液
とした後、添加してもよい。更には、腐食、スケール、
スラッジ、p14.硬度等を調整するために常用される
添加剤、例えば、ヒドラジン、水酸化ナトリウム、リン
酸ナトリウム、ポリアクリル酸ナトリウムが添加された
水系に本発明防止剤を添加してもよく、この場合にあっ
ても。
It becomes uneconomical. When added to boiler feed water, the inhibitor of the present invention may be added alone or in an appropriate mixture of two or more. Alternatively, these may be added after being dissolved in water to form an aqueous solution. Furthermore, corrosion, scale,
Sludge, p14. The inhibitor of the present invention may be added to an aqueous system containing additives commonly used to adjust hardness, such as hydrazine, sodium hydroxide, sodium phosphate, and sodium polyacrylate. Even though.

本発明防止剤の効果は側ら損なわれない。The effectiveness of the inhibitor of the present invention is not impaired.

尚、本発明の防止剤のスケール生成に対する抑制効果は
、主としてキレート形成による亜鉛イオンの封鎖作用に
起因するものと推測される。
It is assumed that the inhibitory effect of the inhibitor of the present invention on scale formation is mainly due to the sequestration effect of zinc ions through chelate formation.

以上の説明は、 srイラ水系を対象としたものである
が1本発明にあっては、水中に1lli鉛が存在する系
であれば、bかなる系であっても使用可能であることは
自明であろう。
Although the above explanation is directed to the SSR water system, in the present invention, any system can be used as long as 1lli lead is present in the water. It should be obvious.

本発明のスケール防止剤を用いれば、水系中の亜鉛イオ
ンに起因するスケールの生成を十分に抑制することが可
能どなる。しかも、180〜250℃の温度域において
使用しても、スケールの生成を抑制する効果は安定して
発揮されるので、ゲインの高濃縮運転等の省エネルギー
運転を行なっても5スケールによる各種弊害が回避され
ることとなり。
By using the scale inhibitor of the present invention, it becomes possible to sufficiently suppress the formation of scale caused by zinc ions in an aqueous system. Moreover, even when used in the temperature range of 180 to 250°C, the effect of suppressing scale formation is stably exhibited, so even if energy-saving operation such as high gain concentration operation is performed, various adverse effects caused by 5 scales will be avoided. It will be avoided.

その工業的価値は極めて大きい。Its industrial value is extremely large.

以下に、実施例を掲げ、本発明のスケール防止剤の効果
を明らかにする。
Examples are given below to clarify the effects of the scale inhibitor of the present invention.

実施例 圧力10 K9f贋、温度180℃、保有水量4675
t、ブロー水! 1.16 t/hrのテス)rイラ条
件下で試験を行ない、テストチューブ(5B−42使用
Example pressure 10 K9f fake, temperature 180℃, water capacity 4675
T-Blow water! 1.16 t/hr test) The test was conducted under irradiation conditions and a test tube (5B-42 was used).

内表面積175cJ)内に付着したスケール黴を測定し
た。
Scale mold adhering to the inner surface area (175 cJ) was measured.

ゲイン給水として軟水を使用し、サーイラ水の水質をp
H11,0〜11.5 (水酸化ナトリウム)、全シリ
カ濃度330〜390ppm、全亜鉛濃度14〜15p
pm、#縮度13倍に設定して、スケール除去剤を添加
せずに45時間ヴゲイン転(7たところ、62mfのス
ケールがテストチューブ日に付着していfcoこのスケ
ールを分析したところ、大半がZn4 (01()2 
S 1207 ・l−120であツ1ζ1、つぎに。
Use soft water as gain water supply to improve the water quality of saira water.
H11.0-11.5 (sodium hydroxide), total silica concentration 330-390ppm, total zinc concentration 14-15p
pm, # Condensation degree set to 13 times, Vgain incubation for 45 hours without adding a scale remover (7), 62 mf of scale was attached to the test tube day.FCOWhen this scale was analyzed, most of it was Zn4 (01()2
S 1207 ・l-120 and then 1ζ1.

アミノトリメチレンホスホン酸(a) エチレンノアミンチトラメチルホスホン酸(1))ヒト
90キシエチリデンジホスホン酸(C)1.2.4−)
リカルダキシフリンー2−ホスホン酸(d’1ニトリロ
トリ酢酸(e) エチレンジアミンテトラ酸CI(f) を、各々水系に140〜150ppn1(亜鉛角°の1
θ倍)添加して上記と同様の試験を行なったところ、各
スケール付着縦は次の通りとなった。
Aminotrimethylenephosphonic acid (a) Ethylenenoaminetitramethylphosphonic acid (1)) Human 90 xyethylidene diphosphonic acid (C) 1.2.4-)
Add ricardaxyfurin-2-phosphonic acid (d'1 nitrilotriacetic acid (e) and ethylenediaminetetraic acid CI (f) at 140 to 150 ppn1 (zinc angle 1
When the same test as above was carried out by adding θ times), each scale adhesion length was as follows.

a  Oダ    b  2η c   O■    d  7■ e  5■    f  3〜 以上の結果から5本発明のスケール防止剤は極めて優れ
たスケール防止効果を示すこと751判明したり
a Oda b 2η c O■ d 7■ e 5■ f 3~ From the above results, it was found that the scale inhibitor of the present invention exhibits an extremely excellent scale prevention effect751.

Claims (6)

【特許請求の範囲】[Claims] (1)  ホスホン酸、α−アミノカルデン酸又はそれ
らの水溶性塩から選ばれる1種もしくは2種以上の化合
物から成る亜鉛びき鋼管又は亜鉛を含む合金からなる配
管を含む水系用スケール防止剤。
(1) A scale inhibitor for aqueous systems, including galvanized steel pipes made of one or more compounds selected from phosphonic acid, α-aminocaldic acid, or water-soluble salts thereof, or piping made of an alloy containing zinc.
(2)前記ホスホン酸がアミノトリメチルホスホン酸で
ある特許請求の範囲第1項記載のスケール防止剤。
(2) The scale inhibitor according to claim 1, wherein the phosphonic acid is aminotrimethylphosphonic acid.
(3)前記ホスホン酸が2−ヒドロキシエチル−1,2
−ジホスホン酸である特許請求の範囲第1項記載のスケ
ール防止剤。
(3) The phosphonic acid is 2-hydroxyethyl-1,2
The scale inhibitor according to claim 1, which is -diphosphonic acid.
(4)前記α−アミノカルがン酸がエチレンジアミンテ
トラ酢酸である特許請求の範囲第1項記載のスケール防
止剤。
(4) The scale inhibitor according to claim 1, wherein the α-aminocarboxylic acid is ethylenediaminetetraacetic acid.
(5)前記α−アミノカルがン酸がニトリロトリ酢酸で
ある特許請求の範囲第1項記載のスケール防止剤。
(5) The scale inhibitor according to claim 1, wherein the α-aminocarboxylic acid is nitrilotriacetic acid.
(6)前記水系がデイラ水系である特許請求の範囲第1
項〜第5項のいずれかに記載のスケール防止剤。
(6) Claim 1, wherein the water system is a Deira water system.
The scale inhibitor according to any one of items 1 to 5.
JP57121349A 1982-07-14 1982-07-14 Antiscaling agent Granted JPS5912799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57121349A JPS5912799A (en) 1982-07-14 1982-07-14 Antiscaling agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57121349A JPS5912799A (en) 1982-07-14 1982-07-14 Antiscaling agent

Publications (2)

Publication Number Publication Date
JPS5912799A true JPS5912799A (en) 1984-01-23
JPS6248560B2 JPS6248560B2 (en) 1987-10-14

Family

ID=14809072

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57121349A Granted JPS5912799A (en) 1982-07-14 1982-07-14 Antiscaling agent

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Country Link
JP (1) JPS5912799A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5171477A (en) * 1991-05-31 1992-12-15 W. R. Grace & Co.-Conn. Corrosion inhibition in chelant solutions
WO2007080811A1 (en) * 2006-01-11 2007-07-19 Kurita Water Industries Ltd. Antiscaling agent and antiscaling method
JP2009240904A (en) * 2008-03-31 2009-10-22 Kurita Water Ind Ltd Scale preventing agent and method for circulating cooling water system in steel manufacturing process
JP2015112557A (en) * 2013-12-12 2015-06-22 中部キレスト株式会社 Deposition suppressor
JP2015174031A (en) * 2014-03-14 2015-10-05 栗田工業株式会社 Method for preventing formation of zinc-based scale, and zinc-based scale inhibitor
CN107902771A (en) * 2017-10-24 2018-04-13 陈木玲 A kind of reverse osmosis dirt dispersion agent and its preparation process

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666664A (en) * 1971-05-12 1972-05-30 Nalco Chemical Co Compositions and methods for controlling scale
JPS518631B2 (en) * 1971-09-23 1976-03-18
DE2225645A1 (en) * 1972-05-26 1974-01-17 Bayer Ag PROCESS FOR PREVENTING CORROSION AND STONE SETTING IN WATER SYSTEMS
JPS528663A (en) * 1975-07-10 1977-01-22 Sakae Katayama Treatment of waste water used for dust collection from waste gas
GB1473488A (en) * 1976-01-15 1977-05-11 Calgon Corp Sludge prevention and removal
JPS6046360B2 (en) * 1976-12-28 1985-10-15 栗田工業株式会社 Method for preventing corrosion and scaling of heat exchangers or their piping
US4255259A (en) * 1979-09-18 1981-03-10 Chemed Corporation Scale inhibition

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5171477A (en) * 1991-05-31 1992-12-15 W. R. Grace & Co.-Conn. Corrosion inhibition in chelant solutions
WO2007080811A1 (en) * 2006-01-11 2007-07-19 Kurita Water Industries Ltd. Antiscaling agent and antiscaling method
JPWO2007080811A1 (en) * 2006-01-11 2009-06-11 栗田工業株式会社 Scale inhibitor and scale prevention method
JP2009240904A (en) * 2008-03-31 2009-10-22 Kurita Water Ind Ltd Scale preventing agent and method for circulating cooling water system in steel manufacturing process
JP2015112557A (en) * 2013-12-12 2015-06-22 中部キレスト株式会社 Deposition suppressor
JP2015174031A (en) * 2014-03-14 2015-10-05 栗田工業株式会社 Method for preventing formation of zinc-based scale, and zinc-based scale inhibitor
CN107902771A (en) * 2017-10-24 2018-04-13 陈木玲 A kind of reverse osmosis dirt dispersion agent and its preparation process

Also Published As

Publication number Publication date
JPS6248560B2 (en) 1987-10-14

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