EP0215655B1 - Verfahren zur Korrosionsinhibierung in Dampfkesseln und Zusammensetzungen hierfür - Google Patents
Verfahren zur Korrosionsinhibierung in Dampfkesseln und Zusammensetzungen hierfür Download PDFInfo
- Publication number
- EP0215655B1 EP0215655B1 EP86307064A EP86307064A EP0215655B1 EP 0215655 B1 EP0215655 B1 EP 0215655B1 EP 86307064 A EP86307064 A EP 86307064A EP 86307064 A EP86307064 A EP 86307064A EP 0215655 B1 EP0215655 B1 EP 0215655B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxygen
- corrosion
- trihydroxybenzene
- compositions
- boiler feedwater
- 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
- 230000007797 corrosion Effects 0.000 title claims description 23
- 238000005260 corrosion Methods 0.000 title claims description 23
- 239000000203 mixture Substances 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 8
- 230000002401 inhibitory effect Effects 0.000 title claims description 5
- 239000001301 oxygen Substances 0.000 claims description 29
- 229910052760 oxygen Inorganic materials 0.000 claims description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 28
- WQGWDDDVZFFDIG-UHFFFAOYSA-N trihydroxybenzene Natural products OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 claims description 28
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 22
- -1 trihydroxybenzene compound Chemical class 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- GGNQRNBDZQJCCN-UHFFFAOYSA-N benzene-1,2,4-triol Chemical compound OC1=CC=C(O)C(O)=C1 GGNQRNBDZQJCCN-UHFFFAOYSA-N 0.000 claims description 8
- 229940079877 pyrogallol Drugs 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 16
- 229940123973 Oxygen scavenger Drugs 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 150000002429 hydrazines Chemical class 0.000 description 6
- 239000003112 inhibitor Substances 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 229910001447 ferric ion Inorganic materials 0.000 description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 4
- 229920001174 Diethylhydroxylamine Polymers 0.000 description 3
- JPYHHZQJCSQRJY-UHFFFAOYSA-N Phloroglucinol Natural products CCC=CCC=CCC=CCC=CCCCCC(=O)C1=C(O)C=C(O)C=C1O JPYHHZQJCSQRJY-UHFFFAOYSA-N 0.000 description 3
- XEVRDFDBXJMZFG-UHFFFAOYSA-N carbonyl dihydrazine Chemical compound NNC(=O)NN XEVRDFDBXJMZFG-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- FVCOIAYSJZGECG-UHFFFAOYSA-N diethylhydroxylamine Chemical compound CCN(O)CC FVCOIAYSJZGECG-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- QCDYQQDYXPDABM-UHFFFAOYSA-N phloroglucinol Chemical compound OC1=CC(O)=CC(O)=C1 QCDYQQDYXPDABM-UHFFFAOYSA-N 0.000 description 3
- 230000002000 scavenging effect Effects 0.000 description 3
- CDAWCLOXVUBKRW-UHFFFAOYSA-N 2-aminophenol Chemical class NC1=CC=CC=C1O CDAWCLOXVUBKRW-UHFFFAOYSA-N 0.000 description 2
- FAXDZWQIWUSWJH-UHFFFAOYSA-N 3-methoxypropan-1-amine Chemical compound COCCCN FAXDZWQIWUSWJH-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 229960001553 phloroglucinol Drugs 0.000 description 2
- 235000010265 sodium sulphite Nutrition 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- SSQTTYSBGWZJKG-UHFFFAOYSA-N C(C=C/C(=O)O)(=O)NN.[Co] Chemical compound C(C=C/C(=O)O)(=O)NN.[Co] SSQTTYSBGWZJKG-UHFFFAOYSA-N 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000003635 deoxygenating effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- RXKJFZQQPQGTFL-UHFFFAOYSA-N dihydroxyacetone Chemical compound OCC(=O)CO RXKJFZQQPQGTFL-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000010350 erythorbic acid Nutrition 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- AZQWKYJCGOJGHM-UHFFFAOYSA-N para-benzoquinone Natural products O=C1C=CC(=O)C=C1 AZQWKYJCGOJGHM-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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
- C23F11/12—Oxygen-containing compounds
-
- 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
-
- 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
- C23F11/144—Aminocarboxylic acids
Definitions
- This invention relates to the inhibition of corrosion in boiler feedwater systems and boilers due to the presence of dissolved oxygen. It is also concerned with compositions for such use.
- the first product of corrosion may be ferric oxide, which is only loosely adherent and blocks off areas to oxygen access. These areas become anionic and iron oxide couples are set up. The iron under the oxide deposit then dissolves, and pitting develops, which thus aggravates corrosion.
- the severity of attack by oxygen will depend on the concentration of dissolved oxygen in the water, and the pH and temperature of the water. As the water temperature increases, corrosion in feed lines, heaters, boilers, steam and return lines made of iorn and steel increases.
- a major approach to reducing oxygen in boiler feedwater is mechanical deaeration. Efficient mechanical deaeration can reduce dissolved oxygen to as low as 5-10 ppb (parts per thousand million) in industrial plants and 2-3 ppb in utility operations. However, even with this trace amount of oxygen, some corrosion may occur in boilers. Removal of the last traces of oxygen from boiler feedwater is generally accomplished by the addition of chemicals that react with oxygen and that are hereinafter referred to as oxygen scavangers.
- oxygen scavengers e.g. sodium sulphite, hyrazine, diethylhydroxylamine, carbohydrazide and hydroquinone, as disclosed in numerous U.S. Patent Specifications.
- US-A-3 551 349 discloses the use of quinones, particularly hydroquinone, as catalysts for the hydrazine-oxygen reaction;
- US-A-4 096 090 discloses the use of hydrazine compounds, a catalytic organometallic complex, and preferably a quinone compound for deoxygenating feedwater;
- US-A-3 808 138 discloses the use of cobalt maleic acid hydrazide with hydrazine for oxygen removal;
- US-A-3 962 113 discloses the use of organic-substituted hydrazines such as monoalkyl hydrazines, dialkyl hydrazines and trialkyl hydrazines as oxygen scavengers.
- hydrazine and related compounds include toxicity and suspected carcinogenicity.
- Hydrazine is toxic if inhaled and is also an irritant to the eyes and skin.
- Carbohydrazide which is a derivative of hydrazine, decomposes to form hydrazine and carbon dioxide at temperatures above 360°F (180°C).
- US-A-4 269 717 discloses the use of carbohydrazide as an oxygen scavenger and metal passivator.
- US-A-4 278 635 and US-A-4 282 111 disclose the use of hydroquinone, as well as other dihydroxy, diamino and amino hydroxy benzenes, as oxygen scavengers; US-A-4 279 767 and US-A-4 487 708 disclose the use of hydroquinone and "mu-amines", which are defined as amines compatible with hydroquinone, e.g. methoxypropylamine; US-A-4 363 734 discloses the use of catalysed 1,3-dihydroxyacetone as an oxygen scavenger; US-A-4 419 327 discloses the use of amine or ammonia neutralized erythorbates as oxygen scavengers.
- DEHA diethylhydroxylamine
- US-A-4 192 844 discloses the use of methoxypropylamine and hydrazine as a corrosion inhibiting composition.
- European Patent Specification EP-A-0 054 345 discloses the use of amino-phenol compounds or acid addition salts thereof as oxygen scavangers.
- UK Patent Specification GB-A-2 138796 discloses the use of trivalent phenols, preferably pyrogallol, to improve the activity of hydrazine/trivalent-cobalt compositions.
- the present invention provides a method for controlling corrosion in boilers and boiler feedwater systems comprising adding to boiler feedwater containing dissolved oxygen an additive comprising at least one trihydroxybenzene compound and hydroquinone in a weight ratio in the range 1:99 to 99:1.
- the present invention also provides a corrosion-inhibiting composition comprising at least one trihydroxybenzene compound and hydroquinone in a weight ratio in the range 1:99 to 99:1.
- the additive can be used in conjunction with hydrazine, but this is not preferred because of the toxicity of hydrazine.
- the preferred dosage in order to inhibit corrosion is from 0.1 to 1,000 parts per million in the feedwater being treated, particularly from 1 to 100 parts per million.
- the preferred mol ratio of the compound to dissolved O2 ranges from 0.01:1.0 to 100.1, particularly 0.1:1 to 20:1.
- trihydroxybenzene compound can be used, viz. (and in order of preference) 1,2,3-trihydroxybenzene (pyrogallol), 1,2,4-trihydroxybenzene (hydroxyhydroquinone), or 1,3,5-trihydroxybenzene (phloroglucinol).
- the trihydroxybenzene compounds can if desired be used in combination with each other or with other known corrosion inhibitors, e.g. filming amines and neutralizing amines.
- compositions of the present invention can be used in the compositions of the present invention if desired.
- Such compounds include catalysts such as cobalt, scale/deposit inhibitors such as chelants, dispersants, sequestrants, polyelectrolytes and organic or inorganic phosphates.
- compositions may be fed to the boiler feedwater by any known means. Thus, they may be pumped into boiler feedwater tanks or lines, or added by some other suitable means. Though for convenience it is recommended that the trihydroxybenzene and hydroquinone be added as a composition, they may be added separately.
- Examples 1-11 show the oxygen scavenging capability of pyrogallol. Pyrogallol, at the concentration indicated in Table I below, was added to a simulated boiler feedwater at a pH of 9.0 and at the temperature shown. Percent oxygen removal vlaues after 2, 4, 6, 8 and 10 minutes are shown in Table I.
- Examples 12-14 show the oxygen scavenging capability of 1,2,4-trihydroxybenzene (phloroglucinol), which was added to simulated boiler feedwater at pH 9 and at the temperatures and dosages shown. Percent oxygen removal values after 2, 4, 6, 8 and 10 minutes are shown in Table II, below.
- oxygen scavengers as boiler water corrosion inhibitors
- results can be misleading. This is true because, in operating systems, oxygen is an intermediary in the corrosion reaction and the first product of corrosion is ferric oxide. Oxygen alone would not necessarily be detrimental were it not for this corrosion reaction.
- the primary function of an oxygen scavenger may therefore be to reduce ferric ions to their original state. Under such conditions, it is the iron itself that is the primary "oxygen scavenger"; the dosing agent functions primarily as a reducing agent for ferric ions.
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)
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86307064T ATE49424T1 (de) | 1985-09-17 | 1986-09-12 | Verfahren zur korrosionsinhibierung in dampfkesseln und zusammensetzungen hierfuer. |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77693585A | 1985-09-17 | 1985-09-17 | |
US776935 | 1985-09-17 | ||
US79500985A | 1985-11-04 | 1985-11-04 | |
US795009 | 1985-11-04 | ||
US80134985A | 1985-11-25 | 1985-11-25 | |
US801349 | 1985-11-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0215655A1 EP0215655A1 (de) | 1987-03-25 |
EP0215655B1 true EP0215655B1 (de) | 1990-01-10 |
Family
ID=27419727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86307064A Expired - Lifetime EP0215655B1 (de) | 1985-09-17 | 1986-09-12 | Verfahren zur Korrosionsinhibierung in Dampfkesseln und Zusammensetzungen hierfür |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0215655B1 (de) |
JP (1) | JP2617453B2 (de) |
AU (1) | AU592367B2 (de) |
CA (1) | CA1294420C (de) |
DE (1) | DE3668190D1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2500835C1 (ru) * | 2012-03-30 | 2013-12-10 | Общество с ограниченной ответственностью "Научно-производственная фирма "ТРАВЕРС" (ООО "НПФ ТРАВЕРС") | Ингибитор углекислотной коррозии для паро-конденсатных установок аминат пк-3 |
RU2516176C2 (ru) * | 2012-03-30 | 2014-05-20 | Общество с ограниченной ответственностью "Научно-производственная фирма "ТРАВЕРС" (ООО "НПФ ТРАВЕРС") | Ингибитор углекислотной коррозии для паровых котлов среднего и высокого давления аминат пк-2 |
RU2557036C1 (ru) * | 2014-04-11 | 2015-07-20 | Фонд поддержки научной, научно-технической и инновационной деятельности "Энергия без границ" | Комплексный реагент для обработки пароводяного тракта энергоблоков тэс |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01225785A (ja) * | 1988-03-07 | 1989-09-08 | Kurita Water Ind Ltd | 洗浄水用鋼板変色防止剤 |
NZ229120A (en) * | 1988-05-23 | 1991-09-25 | Calgon Corp | Inhibiting corrosion in caustic evaporators by using hydroquinone and pyrogallol |
US5064469A (en) * | 1989-10-03 | 1991-11-12 | Akzo N.V. | Preparation of oxidation resistant metal powder |
JP2689059B2 (ja) * | 1992-11-16 | 1997-12-10 | 小糸工業株式会社 | 身体障害者用座席 |
KR100315497B1 (ko) * | 1997-08-13 | 2002-01-17 | 조민호 | 보일러응축시스템의초기응축지역의부식억제방법 |
KR100315496B1 (ko) * | 1997-08-13 | 2002-01-15 | 조민호 | 부식방지조성물을이용한보일러응축시스템의부식억제방법 |
RU2447198C1 (ru) * | 2010-09-27 | 2012-04-10 | Государственное учреждение "Научно-исследовательский технологический институт гербицидов и регуляторов роста растений с опытно-экспериментальным производством Академии наук Республики Башкортостан" | Способ ингибирования коррозии металлов |
RU2543591C2 (ru) * | 2013-07-19 | 2015-03-10 | Открытое акционерное общество "Всероссийский дважды ордена Трудового Красного Знамени теплотехнический научно-исследовательский институт" | Способ организации водно-химического режима на основе комплексного аминосодержащего реагента для пароводяного тракта энергоблока с парогазовыми установками |
RU2702534C1 (ru) * | 2017-11-16 | 2019-10-08 | Публичное акционерное общество "Федеральная гидрогенерирующая компания - РусГидро" | Система защиты от коррозии контура геотермальной электростанции с дополнительным смешиванием |
CN111018028B (zh) * | 2019-12-06 | 2022-01-28 | 南通联膦化工有限公司 | 一种环保型锅炉除氧剂 |
CN111233178A (zh) * | 2020-02-27 | 2020-06-05 | 威海翔泽新材料科技有限公司 | 一种低压锅炉无磷复合清缸剂及制备方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU537619B2 (en) * | 1980-04-28 | 1984-07-05 | Betz International, Inc. | Dioxo-aromatic compounds as oxygen scavengers in an aqueous medium |
JPS57135086A (en) * | 1981-02-13 | 1982-08-20 | Nalco Chemical Co | Method of removing dissolved oxygen from boiler water |
US4419327A (en) * | 1981-12-22 | 1983-12-06 | Nalco Chemical Company | Method of scavenging dissolved oxygen in steam generating equipment using ammonia or amine neutralized erythorbic acid |
FR2522522A1 (fr) * | 1982-01-27 | 1983-09-09 | Leuna Werke Veb | Procede pour ameliorer l'activite initiale de l'hydrazine activee |
JPS58133382A (ja) * | 1982-02-03 | 1983-08-09 | Katayama Chem Works Co Ltd | 塩化カルシウムブライン用防食剤 |
EP0127064A1 (de) * | 1983-05-16 | 1984-12-05 | Amchem Products, Inc. | Verhütung von Rost bei der Herstellung von Dosen |
-
1986
- 1986-09-12 DE DE8686307064T patent/DE3668190D1/de not_active Expired - Fee Related
- 1986-09-12 EP EP86307064A patent/EP0215655B1/de not_active Expired - Lifetime
- 1986-09-15 CA CA000518189A patent/CA1294420C/en not_active Expired - Lifetime
- 1986-09-16 AU AU62734/86A patent/AU592367B2/en not_active Ceased
- 1986-09-17 JP JP61217350A patent/JP2617453B2/ja not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
Kirk-Othmer: Encyclopedia of Chemical Technology, 3rd. ed., vol. 18 (1982), p.681; vol. 24(1984, p.379 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2500835C1 (ru) * | 2012-03-30 | 2013-12-10 | Общество с ограниченной ответственностью "Научно-производственная фирма "ТРАВЕРС" (ООО "НПФ ТРАВЕРС") | Ингибитор углекислотной коррозии для паро-конденсатных установок аминат пк-3 |
RU2516176C2 (ru) * | 2012-03-30 | 2014-05-20 | Общество с ограниченной ответственностью "Научно-производственная фирма "ТРАВЕРС" (ООО "НПФ ТРАВЕРС") | Ингибитор углекислотной коррозии для паровых котлов среднего и высокого давления аминат пк-2 |
RU2557036C1 (ru) * | 2014-04-11 | 2015-07-20 | Фонд поддержки научной, научно-технической и инновационной деятельности "Энергия без границ" | Комплексный реагент для обработки пароводяного тракта энергоблоков тэс |
Also Published As
Publication number | Publication date |
---|---|
JPS62116788A (ja) | 1987-05-28 |
DE3668190D1 (de) | 1990-02-15 |
AU6273486A (en) | 1987-03-19 |
CA1294420C (en) | 1992-01-21 |
EP0215655A1 (de) | 1987-03-25 |
JP2617453B2 (ja) | 1997-06-04 |
AU592367B2 (en) | 1990-01-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4895703A (en) | Trihydroxybenzene boiler corrosion inhibitor compositions and method | |
EP0215655B1 (de) | Verfahren zur Korrosionsinhibierung in Dampfkesseln und Zusammensetzungen hierfür | |
EP0216586B1 (de) | Stabilisiertes Natriumerythorbat und seine Verwendung als Korrosionsinhibitor | |
EP0161822A2 (de) | Zusammensetzung und Verfahren zum Entfernen von Sauerstoff aus wässrigen Systemen | |
US2496354A (en) | Method of inhibiting hydrogen sulfide corrosion of metals | |
US4269717A (en) | Boiler additives for oxygen scavenging | |
US5167835A (en) | Method of scavenging oxygen from boiler waters with substituted quinolines | |
US5091108A (en) | Method of retarding corrosion of metal surfaces in contact with boiler water systems which corrosion is caused by dissolved oxygen | |
US5094814A (en) | All-volatile multi-functional oxygen and carbon dioxide corrosion control treatment for steam systems | |
EP0152661B1 (de) | Polyalkenylphosphonsäure und ihre Anwendung | |
US5368775A (en) | Corrosion control composition and method for boiler/condensate steam system | |
EP0297916B1 (de) | Korrosionskontrolle in wässrigen Systemen | |
CA2015718A1 (en) | Inhibition of corrosion in aqueous systems | |
JPS58113383A (ja) | 蒸気発生装置の脱酸素方法 | |
US6540923B2 (en) | Oxygen scavenger | |
EP0002634B1 (de) | Zubereitung und Verfahren zum Korrosionsschutz in Dampfkondensatssystemen | |
CA1052086A (en) | Boiler water treatment | |
Farahbod | Investigations to find appropriate range of pH and a new replacement for hydrazine to protect corrosion in steam-tanks of petrochemical industries | |
US5660736A (en) | Sodium sulfoxylate formaldehyde as a boiler additive for oxygen scavenging | |
US5164110A (en) | Method of retarding corrosion of metal surfaces in contact with boiler water systems which corrosion is caused by dissolved oxygen | |
US4105406A (en) | Method of inhibiting corrosion using a hexametaphosphate and a phosphate buffer | |
US5589107A (en) | Method and composition for inhibiting corrosion | |
CA1339761C (en) | Corrosion control composition and method for boiler/condensate stem system | |
EP0343712A1 (de) | Verfahren zur Korrosionsinhibierung in Verdampfern für alkalische Lösungen durch Verwendung von katalysiertem Hydrochinon | |
CA1191677A (en) | Sulfite-erythorbic acid corrosion inhibitors |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
ITCL | It: translation for ep claims filed |
Representative=s name: SOCIETA' ITALIANA BREVETTI S.P.A. |
|
17P | Request for examination filed |
Effective date: 19870808 |
|
17Q | First examination report despatched |
Effective date: 19880621 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
REF | Corresponds to: |
Ref document number: 49424 Country of ref document: AT Date of ref document: 19900115 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3668190 Country of ref document: DE Date of ref document: 19900215 |
|
ITF | It: translation for a ep patent filed | ||
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19920721 Year of fee payment: 7 |
|
EPTA | Lu: last paid annual fee | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19930628 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19930712 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19930716 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19930912 |
|
ITTA | It: last paid annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19940912 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19940913 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PUE Owner name: ECC SPECIALTY CHEMICALS, INC. Ref country code: CH Ref legal event code: PFA Free format text: CALGON CORPORATION |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19940930 Ref country code: CH Effective date: 19940930 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
EAL | Se: european patent in force in sweden |
Ref document number: 86307064.5 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
EUG | Se: european patent has lapsed |
Ref document number: 86307064.5 |
|
ITPR | It: changes in ownership of a european patent |
Owner name: CAMBIO RAGIONE SOCIALE;CALGON CORPORATION |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E |
|
NLS | Nl: assignments of ep-patents |
Owner name: ECC SPECIALTY CHEMICALS, INC.;ENGLISH CHINA CLAYS |
|
NLT1 | Nl: modifications of names registered in virtue of documents presented to the patent office pursuant to art. 16 a, paragraph 1 |
Owner name: CALGON CORPORATION |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20020819 Year of fee payment: 17 Ref country code: FR Payment date: 20020819 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20020913 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20020930 Year of fee payment: 17 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030930 |
|
BERE | Be: lapsed |
Owner name: *CALGON CORP. (ANC ECC SPECIALTY CHEMICALS INC) Effective date: 20030930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040401 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040401 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040528 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20040401 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20040908 Year of fee payment: 19 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050912 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050912 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20050912 |