JPH0199682A - Method for removing oxygen contained in boiler-water and aqueous solution therefor - Google Patents
Method for removing oxygen contained in boiler-water and aqueous solution thereforInfo
- Publication number
- JPH0199682A JPH0199682A JP23151688A JP23151688A JPH0199682A JP H0199682 A JPH0199682 A JP H0199682A JP 23151688 A JP23151688 A JP 23151688A JP 23151688 A JP23151688 A JP 23151688A JP H0199682 A JPH0199682 A JP H0199682A
- Authority
- JP
- Japan
- Prior art keywords
- water
- aqueous solution
- dissolved oxygen
- boiler water
- gallic acid
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 31
- 239000001301 oxygen Substances 0.000 title claims abstract description 31
- 239000007864 aqueous solution Substances 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 4
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229940074391 gallic acid Drugs 0.000 claims abstract description 17
- 235000004515 gallic acid Nutrition 0.000 claims abstract description 17
- 230000002000 scavenging effect Effects 0.000 claims description 8
- 239000002585 base Substances 0.000 claims description 6
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 claims description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims 1
- 150000001340 alkali metals Chemical class 0.000 claims 1
- 238000013329 compounding Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 6
- 229940123973 Oxygen scavenger Drugs 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 4
- 230000000711 cancerogenic effect Effects 0.000 description 2
- 231100000357 carcinogen Toxicity 0.000 description 2
- 239000003183 carcinogenic agent Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 235000010265 sodium sulphite Nutrition 0.000 description 2
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Physical Water Treatments (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はボイラー水から溶存酸素を掃去する方法及びそ
のための水溶液に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for scavenging dissolved oxygen from boiler water and an aqueous solution therefor.
〔従来技術と発明が解決しようとする課題〕痕跡量の溶
存酸素の存在はボイラーシステムの腐食の主要原因の１
つである。さらに、もしもボイラー水のｐＨが酸性にな
ると、腐食は加速される。[Prior art and the problem to be solved by the invention] The presence of trace amounts of dissolved oxygen is one of the main causes of corrosion in boiler systems.
It is one. Furthermore, if the pH of the boiler water becomes acidic, corrosion is accelerated.
殆どのシステムでは、溶存酸素の量は機械的脱気処理で
１ｏｐｐｂ以下に下げることが可能である。In most systems, the amount of dissolved oxygen can be reduced to less than 1 opppb by mechanical degassing.
しかしながら、このようにｔｉｏｉｔの酸素量でもボイ
ラー水の温度及び圧力下では腐食が起きる。However, even with this amount of oxygen in tioit, corrosion occurs under the temperature and pressure of boiler water.
痕跡量の酸素ご完全に除去することはボイラー水を酸素
掃去剤として劫く還元剤で処理することによって可能で
ある。この目的のためにヒドラジンと亜ＶｆＬ酸塩が広
く用いられている。しかしながら、これらは欠点を伴っ
ている。Complete removal of traces of oxygen is possible by treating boiler water with a reducing agent that acts as an oxygen scavenger. Hydrazine and VfLite are widely used for this purpose. However, these are associated with drawbacks.
亜硫酸ナトリウムは有効な掃去剤であるが、１０００ｐ
ｓｉ以上で繰作するシステムでは腐食性の亜硫酸及び二
酸化硫黄を形成してブレークダウンが起きるので推奨さ
れない、また亜硫酸ナトリウムはボイラー水中の溶解し
た固形物の量と導電性を増加させる。Sodium sulfite is an effective scavenger, but 1000p
Systems operating above si are not recommended due to the formation of corrosive sulfur dioxide and sulfur dioxide which can lead to breakdown, and sodium sulfite increases the amount of dissolved solids and conductivity in the boiler water.
ヒドラジンは酸素との反応性は亜硫酸はど活性ではない
が、反応生成物はすべて揮発性である。Hydrazine is not as reactive with oxygen as sulfite, but all reaction products are volatile.
残念ながら、ヒドラジンは発癌物質に数えられており、
すべての用途において注意深く取り扱われなければなら
ない。Unfortunately, hydrazine is considered a carcinogen.
Must be handled carefully in all applications.
発癌物質でない酸素掃去剤を提供することが望ましいで
あろう。It would be desirable to provide an oxygen scavenger that is not a carcinogen.
本発明はボイラー水中に含まれる酸素の１モル当り少な
くとも０．３モル、好ましくは１〜２モルの没食子酸（
３，４，５−）リヒドロキシ安息香酸）で処理すること
からなる、スチームを発生するために用いる水から溶存
酸素を掃去する方法にある。The present invention provides at least 0.3 mol, preferably 1 to 2 mol, of gallic acid per mol of oxygen contained in the boiler water.
3,4,5-) hydroxybenzoic acid) for scavenging dissolved oxygen from water used to generate steam.
本発明は、同様に、少なくとも０．３重量％から飽和濃
度までの没食子酸を含む、ボイラー水を処理して溶存酸
素を掃去するのに有用なｆＡ厚氷水溶液も係る。この濃
厚水溶液は少なくとも８．５のｐＨを有する。The present invention also relates to an fA ice-water solution useful for treating boiler water to scavenge dissolved oxygen, containing gallic acid from at least 0.3% by weight up to saturation concentration. This concentrated aqueous solution has a pH of at least 8.5.
なお、本発明において没食子酸は３，４．５−トリヒド
ロキシ安息香酸であるが、システム中で存在する没食子
酸の塩をも含むものと解されるべきである。In the present invention, gallic acid is 3,4.5-trihydroxybenzoic acid, but it should be understood that salts of gallic acid present in the system are also included.
使■逢１Ｊじυ１１
没食子酸は室温で活性な酸素掃去剤であり、従って５〜
３０００ｐｓｉｇの範囲の圧力を用いるボイラー水シス
テムの酸素掃去剤としても有効であろうと考えられる。1Jjiυ11 Gallic acid is an active oxygen scavenger at room temperature and therefore
It is believed that it would also be effective as an oxygen scavenger in boiler water systems using pressures in the 3000 psig range.
実際に、没食子酸は有効に酸素を掃去することが見出さ
れた。１８５″Ｆで、溶存酸素１モル当り没食子酸１モ
ルの用量で、１０分後に存在する酸素の９５％が除去さ
れた。試験方法として酸素飽和水をフロースルー型プレ
ボイラーのシュミレーション装置を通して供給した。処
理試薬の滞留時間は約１０分間である。水の温度は１８
５下に保持し、ｐＨは水酸化ナトリウムで制御した。In fact, gallic acid has been found to effectively scavenge oxygen. At 185″F, at a dose of 1 mole gallic acid per mole dissolved oxygen, 95% of the oxygen present was removed after 10 minutes. As a test method, oxygen-saturated water was fed through a flow-through preboiler simulation device. .The residence time of the treatment reagents is approximately 10 minutes.The temperature of the water is 18
pH was controlled with sodium hydroxide.
酸素濃度を酸素電極を用いて連続的にモニターした。Oxygen concentration was continuously monitored using an oxygen electrode.
前記の如く、本発明の実施に用いる酸素掃去剤はシステ
ムに存在する酸素１モル当り０．３モルのように少量の
用量で掃去能力がある。ボイラー水中存在する酸素１モ
ル当り１モル又はそれ以上の量で用いると最良の結果が
得られる。As mentioned above, the oxygen scavengers used in the practice of this invention are capable of scavenging at doses as small as 0.3 moles per mole of oxygen present in the system. Best results are obtained when used in amounts of 1 mole or more per mole of oxygen present in the boiler water.
１１木１液
没食子酸自身を用いる場合の欠点の１つはそれが水に対
する溶解性が低いことである０本発明はこの化合物の濃
厚水溶液を含み、これはボイラーの腐食を防止するため
に用いるタイプの水酸化ナトリウム又はその他の塩基で
濃厚水溶液のｐＨを少なくとも８．５に調整して調製す
る。One of the disadvantages of using 1-part gallic acid itself is that it has low solubility in water.The present invention includes a concentrated aqueous solution of this compound, which is used to prevent corrosion in boilers. A concentrated aqueous solution is prepared by adjusting the pH to at least 8.5 with sodium hydroxide of the type or other base.
用いうる塩基には、限定するわけではないが、アルカリ
金属水酸化物及びアルカリ土類金属水酸化物がある。塩
基はｐＨを少なくとも８．５以上にするのに十分な量で
用いることが好ましい、ｐＨを１１．５より大きくして
もそれ以上の利点はない。Bases that can be used include, but are not limited to, alkali metal hydroxides and alkaline earth metal hydroxides. Preferably, the base is used in an amount sufficient to bring the pH to at least 8.5, with no further advantage to increasing the pH above 11.5.
このような濃厚液を調整するために用いる水をこれらの
塩基でそのｐＨを調整した場合、このような水は約５〜
１０重量％の没食子酸を溶解することが可能である。こ
のような濃厚液はボイラー水システムの酸素を掃去する
のに適している。When the pH of the water used to prepare such concentrates is adjusted with these bases, such water has a pH of about 5 to
It is possible to dissolve 10% by weight of gallic acid. Such concentrates are suitable for scavenging oxygen in boiler water systems.
表１
水 ５ 不溶性 −−Ｍａｉｌ！
。、。１％５ 溶解 溶解 −
＊ＧＡ：没食子酸
表２はＮａＯＨで中和しｐＨを９．０に調整した没食子
酸を用いる水システムで酸素を掃去するデータを示す。Table 1 Water 5 Insoluble --Mail! . ,. 1%5 Dissolution Dissolution - *GA: Gallic Acid Table 2 shows data for scavenging oxygen in a water system using gallic acid neutralized with NaOH and adjusted to pH 9.0.
宍−二り
温度：１８５℃
５・９／１ ９０％１．４８／
１ ７０％０．７４／ １
４０％温度＝２３℃
４／１ ７４％１／１
２０％表３のデータは表２のデ
ータを得るのと同じ装置で得られたものであるが、表３
のデータは温度制御と滞留時間を改良するべく実験手順
をいくらか改変して得たものである。Shishi-jiri temperature: 185℃ 5.9/1 90% 1.48/
1 70%0.74/1
40% temperature = 23℃ 4/1 74% 1/1
20% The data in Table 3 were obtained on the same equipment used to obtain the data in Table 2, but
The data were obtained with some modifications to the experimental procedure to improve temperature control and residence time.
温度二８５℃ ２／１ ９８％ １／１ ９５％ 温度：２３℃Temperature 285℃ 2/1 98% 1/1 95% Temperature: 23℃
Claims (1)
とも０．３モルの没食子酸で処理することを特徴とする
スチームを発生するために用いた水から溶存酸素を掃去
する方法。 ２、溶存酸素１モル当り少なくとも１モルの没食子酸を
用いる請求項１記載の方法。 ３、少なくとも０．３重量％の没食子酸を含み、少なく
とも８．５のｐＨを有し、このｐＨをボイラー水を処理
するために用いるタイプの塩基で調整したことを特徴と
するボイラー水を処理してその溶存酸素を掃去するのに
有用な水溶液。 ４、ｐＨが少なくとも９．０である請求項３記載の水溶
液。 ５、前記塩基がアルカリ金属又はアルカリ土類金属の水
酸化物である請求項３又は４記載の水溶液。 ６、スチームを発生するために用いる水を充分な請求項
３記載の水溶液で処理することからなるボイラー水から
溶存酸素を掃去する方法。[Claims] 1. Scavenging dissolved oxygen from water used to generate steam, characterized in that it is treated with at least 0.3 moles of gallic acid per mole of oxygen contained in the boiler water. how to. 2. The method of claim 1, wherein at least 1 mole of gallic acid is used per mole of dissolved oxygen. 3. Treatment of boiler water, characterized in that it contains at least 0.3% by weight of gallic acid and has a pH of at least 8.5, the pH being adjusted with a base of the type used for treating boiler water. an aqueous solution useful for scavenging its dissolved oxygen. 4. The aqueous solution according to claim 3, having a pH of at least 9.0. 5. The aqueous solution according to claim 3 or 4, wherein the base is an alkali metal or alkaline earth metal hydroxide. 6. A method for scavenging dissolved oxygen from boiler water comprising treating the water used to generate steam with sufficient of the aqueous solution of claim 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9857687A | 1987-09-18 | 1987-09-18 | |
| US098576 | 1993-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0199682A true JPH0199682A (en) | 1989-04-18 |
Family
ID=22269943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23151688A Pending JPH0199682A (en) | 1987-09-18 | 1988-09-17 | Method for removing oxygen contained in boiler-water and aqueous solution therefor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH0199682A (en) |
| AU (1) | AU2224388A (en) |
| NZ (1) | NZ226203A (en) |
| ZA (1) | ZA886929B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5640112A (en) * | 1994-02-28 | 1997-06-17 | Rikagaku Kenkyusho | Clock signal distributing system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51117991A (en) * | 1975-04-10 | 1976-10-16 | Reisuke Saito | A process for producing oxygen absorbent |
| JPS528648A (en) * | 1975-07-09 | 1977-01-22 | Kurita Water Ind Ltd | Method for the removal of dissolved oxygen |
| JPS60221032A (en) * | 1984-04-16 | 1985-11-05 | Nippon Oil & Fats Co Ltd | Freshness preserving agent for fish and shellfish |
| JPS62130644A (en) * | 1985-12-02 | 1987-06-12 | Nakahara Shokai:Kk | Freshness keeping agent |
| JPS62501687A (en) * | 1985-01-03 | 1987-07-09 | ジヤバリ−，ウオルタ−・ジエイ | Cleaning liquid for cooling systems |
-
1988
- 1988-09-14 AU AU22243/88A patent/AU2224388A/en not_active Abandoned
- 1988-09-15 NZ NZ22620388A patent/NZ226203A/en unknown
- 1988-09-16 ZA ZA886929A patent/ZA886929B/en unknown
- 1988-09-17 JP JP23151688A patent/JPH0199682A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51117991A (en) * | 1975-04-10 | 1976-10-16 | Reisuke Saito | A process for producing oxygen absorbent |
| JPS528648A (en) * | 1975-07-09 | 1977-01-22 | Kurita Water Ind Ltd | Method for the removal of dissolved oxygen |
| JPS60221032A (en) * | 1984-04-16 | 1985-11-05 | Nippon Oil & Fats Co Ltd | Freshness preserving agent for fish and shellfish |
| JPS62501687A (en) * | 1985-01-03 | 1987-07-09 | ジヤバリ−，ウオルタ−・ジエイ | Cleaning liquid for cooling systems |
| JPS62130644A (en) * | 1985-12-02 | 1987-06-12 | Nakahara Shokai:Kk | Freshness keeping agent |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5640112A (en) * | 1994-02-28 | 1997-06-17 | Rikagaku Kenkyusho | Clock signal distributing system |
Also Published As
| Publication number | Publication date |
|---|---|
| NZ226203A (en) | 1990-03-27 |
| ZA886929B (en) | 1989-05-30 |
| AU2224388A (en) | 1989-05-25 |
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