JPS6267183A - Method for preventing corrosion in cooling water system - Google Patents

Method for preventing corrosion in cooling water system

Info

Publication number
JPS6267183A
JPS6267183A JP20632785A JP20632785A JPS6267183A JP S6267183 A JPS6267183 A JP S6267183A JP 20632785 A JP20632785 A JP 20632785A JP 20632785 A JP20632785 A JP 20632785A JP S6267183 A JPS6267183 A JP S6267183A
Authority
JP
Japan
Prior art keywords
cooling water
sodium
salts
acid
salt
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.)
Pending
Application number
JP20632785A
Other languages
Japanese (ja)
Inventor
Tsutomu Matsushita
勉 松下
Munetaka Tsuro
津呂　宗孝
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.)
KIYOUEISHIYA YUSHI KAGAKU KOGYO KK
Kyoeisha Chemical Co Ltd
Mitsubishi Heavy Industries Ltd
Original Assignee
KIYOUEISHIYA YUSHI KAGAKU KOGYO KK
Kyoeisha Chemical Co Ltd
Mitsubishi Heavy 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 KIYOUEISHIYA YUSHI KAGAKU KOGYO KK, Kyoeisha Chemical Co Ltd, Mitsubishi Heavy Industries Ltd filed Critical KIYOUEISHIYA YUSHI KAGAKU KOGYO KK
Priority to JP20632785A priority Critical patent/JPS6267183A/en
Publication of JPS6267183A publication Critical patent/JPS6267183A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/14—Nitrogen-containing compounds
    • C23F11/147—Nitrogen-containing compounds containing a nitrogen-to-oxygen bond

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

PURPOSE:To prevent the corrosion of steel in a cooling water system for a long period by adding a salt of 5-nitroisophthalic acid such as the sodium salt to circulating cooling water. CONSTITUTION:One or more kinds of salts of 5-nitroisophthalic acid such as the sodium, potassium, ammonium and amine salts are added to circulating cooling water. Since the salts of 5-nitroisophthalic acid are hardly degraded by bacteria, the initial concn. can be maintained for a long time without using a bactericide. When the amount of the salts added is about 240ppm, the corrosion preventing effect is not reduced for about 30 days and other effects such as reduced blowing of the water used are produced.

Description

【発明の詳細な説明】 （座業上の利用分野） 本発明は循環冷却水系の鉄鋼の腐食を防止する冷却水系
の防食方法に関するものでおる。DETAILED DESCRIPTION OF THE INVENTION (Field of Sedentary Use) The present invention relates to a method for preventing corrosion of steel in a circulating cooling water system.

（従来の技術） 従来循環冷却水内には各抛のバクテリア會含有するため
、これに添加した防食剤がそれによって分解され濃度が
低下して防食効果が減衰するものでおった。そのため柚
々の殺菌剤を添加してｈるものであった。(Prior Art) Conventionally, circulating cooling water contains a bacterial community, which decomposes the anticorrosion agent added thereto, lowering its concentration and reducing its anticorrosion effect. For this reason, a fungicide from Yuzu was added.

（発明が解決しようとする間融点） 本発明は防食剤の組成＊１分解するバクテリア菌類とし
ては各種類のものが存在しているが、りん酸ナトリウム
、！ｌｌ！硝酸ナトリウム、カルメン酸塩尋の防食剤１
成１ｉ１２Ｉに、通常上記のバクテリア、菌類に分解さ
れる。(Melting point to be solved by the invention) The composition of the anticorrosive agent of the present invention*1 There are various kinds of bacteria and fungi that decompose, but sodium phosphate,! ll! Sodium nitrate, carmenate fatten anticorrosion agent 1
It is usually degraded by the bacteria and fungi mentioned above.

又ニトロフタル酸或はその塩例えば２ニトロテレフタル
酸、３ニトロフタル酸、４ニトロフタル酸、５ニトロイ
ソフタル酸Ｆ′ｉ循用冷却水の防食剤として使用されて
いる。Nitrophthalic acid or its salts, such as 2-nitroterephthalic acid, 3-nitrophthalic acid, 4-nitrophthalic acid, and 5-nitroisophthalic acid F'i, are also used as anticorrosive agents for circulating cooling water.

この循環冷却水に上記組成物を添加して運転を継続して
いると該組成物の濃度が低下し防食効果を発揮すること
が出来なくなる。このニトロフタル酸或はその塩の内４
ニトロフタル酸ナトリウムが最も早＜ｍｉが低下して消
耗し、順、プ１゜ 次３ニトロフタル酸ナトリウム、２ニトロ７フタル酸ナ
トリウムと＆Ａ度が低下した。最も長期に尚初添加した
濃度を保持するものけ５ニトロイソフタル酸ナトリウム
である。If the above-mentioned composition is added to the circulating cooling water and the operation is continued, the concentration of the composition decreases and the anticorrosion effect cannot be exhibited. 4 of these nitrophthalic acids or their salts
Sodium nitro phthalate was consumed most quickly with a decrease in <mi, followed by sodium nitrophthalate, sodium 2-nitro-7 phthalate, and &A degree. It is Monoke 5 sodium nitroisophthalate that maintains the initially added concentration for the longest period of time.

（問題点を解決するための手段） 本発明は循環冷却水に５ニトロイソフタル酸のナトリウ
ム塩、カリウム塩、アンモニウム塩、アミン塩の内少く
とも一種以上を添加すること罠よって殺菌剤會併用する
ことなく長期に初期濃度全保持することを可能にしたも
のである。(Means for Solving the Problems) The present invention involves adding at least one of the sodium salt, potassium salt, ammonium salt, and amine salt of 5-nitroisophthalic acid to the circulating cooling water, thereby using it in combination with a disinfectant. This makes it possible to maintain the full initial concentration for a long period of time.

（作　用） バクテリアによる分解において、耐性を有する置換体の
位置の関係が明白であるとはいえないが、５ニトロイソ
フタル酸ナトリウムか他の形のニトロフタル酸ナトリウ
ムに比較して分解をうけないことは明らかである。(Effect) Although the relationship between the positions of the resistant substituents during bacterial decomposition is not clear, it is less susceptible to decomposition than sodium 5-nitroisophthalate or other forms of sodium nitrophthalate. is clear.

（実施例） ニトロフタル酸は分光光度計２８０ａｍの吸光度を測定
することによって濃度を測定することが可能でおる。(Example) The concentration of nitrophthalic acid can be measured by measuring the absorbance using a spectrophotometer at 280 am.

而して火力発電所の軸受冷却水系に５ニトロイソフタル
酸ナトリウムη）、３ニトロフタル酸ナトリウム（Ｂｌ
、２ニトロテレフタル酸ナトリウム（Ｃ）、４ニトロフ
タル酸ナトリウム（Ｄ）’を夫々２４０ｐｐｍ添加して
約３０日間の濃度変化を測定した。その結果は図面に示
す通りでおる。Sodium 5-nitroisophthalate η) and sodium 3-nitrophthalate (Bl
, 240 ppm of sodium 2-nitroterephthalate (C), and 240 ppm of sodium 4-nitrophthalate (D)' were measured for about 30 days. The results are as shown in the drawing.

なお５ニトロイソフタル酸、２ニドロチレフタル酸、２
ニトロイソフタル酸、３ニトロフタル酸、４ニトロフタ
ル酸の構造式を示すと下記の通りである。In addition, 5 nitroisophthalic acid, 2 nidrothyrephthalic acid, 2
The structural formulas of nitroisophthalic acid, 3-nitrophthalic acid, and 4-nitrophthalic acid are shown below.

５ニトロイソフタル酸　　　　２ニトロテレフタル酸２
ニトロイソフタル酸　　　　３ニトロ７タに酸４ニトロ
フタル酸 ＮＬＪ　２　　　−４− 図面から明らかな如く５ニトロイソフタル酸ナトリウム
を添加し九場合には３０日間を経過するも伺尋その濃度
に変化なく長期に亘り防食の効果全保持することが出来
るものである。5 Nitroisophthalic acid 2 Nitroterephthalic acid 2
Nitroisophthalic acid 3-nitro-7-acid 4-nitrophthalic acid NLJ 2 -4- As is clear from the drawing, the concentration remained unchanged for a long time even after 30 days had passed since sodium 5-nitroisophthalate was added. It is possible to maintain all the anti-corrosion effects.

又６塩の個別のテス）１−行ったが、その都度便用水は
すべて入れ換えて次のテストに移行し九。In addition, I conducted 6 individual salt tests) 1-1, but each time I replaced all the toilet water and moved on to the next test.9.

（効　果） 本発明はバクテリアにより分解され難い５ニトロイソフ
タル酸ナトリウムを使用することにより殺菌剤の使用置
皿に防食剤（ヒドロフタル酸す）ＩＪウム）の補給が著
しく軽減され且つ使用水のブローも少くなる轡工業上極
めて有用である。(Effects) By using sodium nitroisophthalate, which is difficult to be decomposed by bacteria, the present invention significantly reduces the need for replenishing the anticorrosive agent (hydrophthalic acid) to the tray used for the disinfectant, and allows the use of water to be blown away. It is extremely useful in industry as it reduces the amount of waste.

【図面の簡単な説明】[Brief explanation of drawings]

図面は各種のニトロフタル酸ナトリウム管添加した循環
冷却水の経過日数と濃度との関係曲線図である。 Ａ・・・５ニトロイソフタル酸ナトリウム、Ｂ・・・３
ニトロフタル酸ナトリウム、Ｃ・・・２ニドロチレフタ
ル酸ナトリウム、Ｄ・・・４ニトロフタル酸ナトリウム
。 出願人代理人　　弁理士　鈴　江　武　彦６一The figure is a graph showing the relationship between the number of days elapsed and the concentration of circulating cooling water added to various sodium nitrophthalate tubes. A...5 Sodium nitroisophthalate, B...3
Sodium nitrophthalate, C...2 sodium nidrothyrephthalate, D...4 sodium nitrophthalate. Applicant's agent Patent attorney Takehiko Suzue 61

Claims (1)

【特許請求の範囲】[Claims] 冷却水に５ニトロイソフタル酸のナトリウム塩、カリウ
ム塩、アンモニウム塩、アミン塩等の内少くとも一種以
上を添加することを特徴とする冷却水系の防食方法。A method for preventing corrosion of a cooling water system, characterized by adding at least one kind of sodium salt, potassium salt, ammonium salt, amine salt, etc. of 5-nitroisophthalic acid to the cooling water.
JP20632785A 1985-09-20 1985-09-20 Method for preventing corrosion in cooling water system Pending JPS6267183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20632785A JPS6267183A (en) 1985-09-20 1985-09-20 Method for preventing corrosion in cooling water system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20632785A JPS6267183A (en) 1985-09-20 1985-09-20 Method for preventing corrosion in cooling water system

Publications (1)

Publication Number Publication Date
JPS6267183A true JPS6267183A (en) 1987-03-26

Family

ID=16521460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20632785A Pending JPS6267183A (en) 1985-09-20 1985-09-20 Method for preventing corrosion in cooling water system

Country Status (1)

Country Link
JP (1) JPS6267183A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05338858A (en) * 1992-06-15 1993-12-21 Toshiba Corp Paper sheet takeout device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5324366A (en) * 1976-08-19 1978-03-07 Hitachi Chemical Co Ltd Method of manufacture of melamine resin decorative laminate
JPS5760426A (en) * 1980-09-30 1982-04-12 Toshiba Corp Display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5324366A (en) * 1976-08-19 1978-03-07 Hitachi Chemical Co Ltd Method of manufacture of melamine resin decorative laminate
JPS5760426A (en) * 1980-09-30 1982-04-12 Toshiba Corp Display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05338858A (en) * 1992-06-15 1993-12-21 Toshiba Corp Paper sheet takeout device

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