GB2189781A - Control of corrosion in aqueous systems - Google Patents
Control of corrosion in aqueous systems Download PDFInfo
- Publication number
- GB2189781A GB2189781A GB08709922A GB8709922A GB2189781A GB 2189781 A GB2189781 A GB 2189781A GB 08709922 A GB08709922 A GB 08709922A GB 8709922 A GB8709922 A GB 8709922A GB 2189781 A GB2189781 A GB 2189781A
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- GB
- United Kingdom
- Prior art keywords
- scavenger
- oxygen
- added
- ppm
- boiler
- 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.)
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- 230000007797 corrosion Effects 0.000 title claims abstract description 19
- 238000005260 corrosion Methods 0.000 title claims abstract description 19
- 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 claims abstract description 20
- 229960001553 phloroglucinol Drugs 0.000 claims abstract description 19
- QCDYQQDYXPDABM-UHFFFAOYSA-N phloroglucinol Chemical compound OC1=CC(O)=CC(O)=C1 QCDYQQDYXPDABM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 229940123973 Oxygen scavenger Drugs 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 150000002739 metals Chemical class 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 3
- 150000003839 salts Chemical class 0.000 claims abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 35
- 229910052760 oxygen Inorganic materials 0.000 claims description 35
- 239000001301 oxygen Substances 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 19
- 239000002516 radical scavenger Substances 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 125000002444 phloroglucinyl group Chemical group [H]OC1=C([H])C(O[H])=C(*)C(O[H])=C1[H] 0.000 claims 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 description 16
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 14
- 239000000243 solution Substances 0.000 description 7
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 6
- 230000002000 scavenging effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 235000010265 sodium sulphite Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 150000002443 hydroxylamines Chemical class 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- -1 1-methoxy-3,5-dihydroxybenzene 1,3-dimethoxy-5-hydroxybenzene 1 ,3,5-trimethoxybenzene 1 -methoxy-3,5-diethoxybenzene 1 ,3-dimethoxy-5-ethoxybenzene 1 ,3,5-triethoxybenzene 1 ,3,5-tripropoxybenzene Chemical compound 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000070928 Calligonum comosum Species 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 229910000397 disodium phosphate Inorganic materials 0.000 description 1
- 235000019800 disodium phosphate Nutrition 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C23F11/122—Alcohols; Aldehydes; Ketones
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Corrosion of metals in contact with an aqueous solution is achieved by adding an effective amount of an oxygen scavenger selected from the group of phloroglucinol and other scavengers of the formula: <IMAGE> wherein R1, R2, and R3 may be the same or different and are each a member selected from the group consisting of hydrogen, and lower alkyl having 1 to about 8 carbon atoms; or water-soluble salts thereof.
Description
SPECIFICATION
Control of corrosion in aqueous systems
This invention relates to the addition of oxygen scavengers to aqueous solutions to reduce the corrosion of metals that are in contact with the solutions, and more particularly, to the addition of compositions comprising phloroglucinol or certain related compounds to an aqueous solution as oxygen scavengers to reduce corrosion of metal surfaces in contact with the solution.
In processes using aqueous solutions, corrosion of metal surfaces may occur at various locations including feed lines, heaters, steam lines, process tanks and return lines. Dissolved oxygen in the water can be a principal factor influencing this corrosion, particularly where iron and steel are materials of construction. The corrosion of the iron and steel pipes, boilers, and economizers of conventional boiler systems is a well known problem; and controlling the presence of oxygen in boiler systems, particularly in the feed water section, has received considerable attention. Oxygen removal may be partially accomplished by either vacuum or thermal deaeration, or both. Complete removal of oxygen cannot be effected by these means, however, and further removal by use of a chemical scavenging agent, such as sodium sulfite, has been a customary practice.
In recent times, the use of low pressure boilers (operating below about 150 psig) has been increasingly supplemented by use of boilers operating at moderate pressure (operating between about 150 psig and about 600 psig) and high pressure (operating above about 600 psig). As boiler operating temperatures and pressures have increased there has been particular interest in the performance of oxygen scavengers at these operating conditions. For example, use of sulphites at elevated temperatures and pressures may cause an increase in solids, and formation of sulfur dioxide and hydrogen sulfide, both of which can be a source of corrosion. Scavengers such as hydrazine, hydroquinone, and certain hydroxylamines have been found to perform satisfactorily in some circumstances.In other circumstances, the efficiency with which the scavenging proceeds has not been optimal. There is thus a continuing need for alternative oxygen scavengers which can be effectively used at elevated temperatures and pressures.
Despite the toxicity of hydrazine, much recent research has concerned development of corrosion inhibitors using hydrazine and various organic products, including quinone compounds including hydroxyl forms such as pyrocatechol and hydroquinone, which act as catalysts.
Other work has focused on hydroxylamines and on hydroquinone and some of its derivatives.
It has now been found, according to the present invention, that addition of phloroglucinol (C6H603) and related compounds to aqueous solutions, including boiler system water containing dissolved airand/or oxygen, inhibits the corrosion of metal in contact with the solutions by removing oxygen dissolved therein.
The invention is especially suited for boiler water systems consisting essentially of water containing dissolved oxygen. Indeed, the efficiency of oxygen scavenging achieved with phioroglucinol at conditions found within boiler systems is particularly advantageous.
Accordingly, it is an objectofthis invention to provide a method to inhibit corrosion of metals in contact with aqueous solutions.
It is another object of this invention to remove oxygen from boiler system water.
It is another object of this invention to use a corrosion reducing agent which may be used effectively in boilers operated at elevated pressures.
These and other objects and advantages of the present invention will become apparent from thefollowing detailed description of the invention.
Detailed description
According to the present invention there is provided a method for control of corrosion of one or more metals in contact with an aqueous system which comprises adding to the aqueous solution an oxygen scavenger which is a water soluble phloroglucinol-related substituted benzene of the general formula:
wherein each of R1, R2 and R3, which may be the same or different, represents hydrogen or lower alkyl having 1 to about8 carbon atoms.Examples of such compounds are: 1 ,3,5-trihydroxybenzene (phlorog lucinol ) 1-methoxy-3,5-dihydroxybenzene 1,3-dimethoxy-5-hydroxybenzene 1 ,3,5-trimethoxybenzene 1 -methoxy-3,5-diethoxybenzene 1 ,3-dimethoxy-5-ethoxybenzene 1 ,3,5-triethoxybenzene 1 ,3,5-tripropoxybenzene
Water soluble salts of these compounds may also be used. These compounds will be referred to throughout this specification as "phloroglucinol-related" compounds. Preferably, R1, R2, and R3 are all hydrogen.
Accordingly, the preferred inhibitor of this invention is phloroglucinol itself (C6HeO3) having the general structural formula:
The structural formulae above are for identification only. Ail tautomericforms ofthese phloroglucinol-related compounds are within the scope of this invention. Most notably,
representing a ketoneform of phloroglucinol,will be recognized by one skilled in the artas an equivalent of the phenol form represented above.
The use of phioroglucinol-related compounds as oxygen scavengers may be practiced in various water systems, such as recirculating cooling systems. However, they are particularly suited for use as oxygen scavenging additives to boiler related systems, such as, for example, boilerfeedwater and boilertankwater.
One suggested use is fortreatment of water in a dormant boiler. In boiler water systems, corrosion may occur in feed lines, heaters, economizers, boilers, steam lines, and return lines; and the invention is intended for broad use in any boiler water system (i.e. at pressures in the range of otto 1000 psig or higher). Indeed, inasmuch as phloroglucinol-related compounds perform effectively at higher pressures and temperatures, they are seen as particularly suited for boiler water systems operating at temperatures in the range of about 298to about 637'F and at pressures in the range of about 50 psig to 2000 psig. The metal surfaces exposed to these conditions are generally iron and steel.
Practice of the invention will become further apparent from the following non-limiting example.
Examples
The oxygen scavenging activity of the chemicals was evaluated in an experimental boiler. This experimental boiler has been described previously in the proceedings ofthe Fifteenth Annual Water
Conference, Engineers Society of Western Pennsylvania, pages 87-102(1954). Essentially, it consists of a vertical steel tube fitted with three external heating loops extending from near the bottom and discharging nearthe center of the central tube. Boiler water circulates through each heating loop from bottom to top and steam is withdrawn from the top of the vertical tube. The heating source in each loop consists of an electrical fire-rod unit transferring heat indirectly through the walls of a heating tube.
The feedwaterwas saturated with oxygen by continuous aeration maintaining about 9 to 10 milligrams per liter of dissolved oxygen. This feedwater contained a total hardness of approximately 10 ppm (as CaC03) and had a pH of about 7. Typical boilerwatertreatment chemicals such as sodium hydroxide (caustic soda) and disodium phosphate for alkalinity and calcium hardness control were added to the water in the boiler. The boiler water pH ranged from 11.0 to 11.5. Feedwater passed into the boiler where it was heated to a temperature of about442 F under a pressure of about375 psig. After steam formation,the steam was condensed through a heat exchanger.The condensate, which had a temperature of approximately 55 F, was then passed through a chamber containing a standard oxygen probe. The dissolved oxygen in the condensate was measured in the chamber to determine the effectiveness of oxygen removal within the system.
Boilerwaterwas fed through the system without addition of any oxygen scavenger until a constant dissolved oxygen reading was observed in the condensate. Once the base dissolved oxygen level in the condensate was established, phloroglucinol (as a solution containing about 0.5 weight percent phloroglucinol) was added as the sole oxygen scavenger to the boilerfeedwater at a dosage of 20 parts per million (ppm). The dissolved oxygen level in the condensate wasthen monitored to determine a final level by which the effectiveness of the ph lorog lucinol could be determined. The phioroglucinol used in this run was supplied by Ishihara Sangyo Kaisha, Ltd., Tokyo, Japan.
A second run was made using hydrazine. After a base dissolved oxygen level in the condensate was established, hydrazine was added to the feedwater at a dosage of 20 ppm. The final level of oxygen in the condensate was then measured to determine the effectiveness ofthe hydrazine in the system.
Athird run was made using sodium sulfite. After a base dissolved oxygen level in the condensate was established, sodium sulfitewas added to thefeedwater at a dosage of 60 ppm. The final level of oxygen in the condensate was then measured to determine the effectiveness ofthe sulfite in the system.
The results of these runs are summarized in Table I.
TABLE I
Base Level of FinalLevelof Reduction in
Oxygen Dissolved Oxygen Dosage of Oxygen Dissolved Oxygen Dissolved
Scavenger in Condensate (ppm) Scavenger (ppm) in Condensate Oxygen (%) Phloroglucinol 2.60 20 0.00 100.00
Hydrazine 3.75 20 0.10 97.3
Sodium Sulfite 3.00 60 0.095 96.8
The results shown in Table I indicate that phioroglucinol was an effective oxygen scavenger in the boiler system. It is evident that phioroglucinol-related compounds may be utilized as an oxygen scavenger in moderate and high pressure boiler systems. The iron and steel components typically found in these systems can thus be effectively protected from oxygen-related corrosion.
The process of this invention for inhibiting corrosion of metal surfaces in contact with an aqueous solution by scavenging oxygen from the solution comprises adding in the aqueous solution an effective amount of at least one phioroglucinol-related compound. The preferred dosage range is generally from about 0.001 ppm to about 500 ppm, with the most preferred dosage range being generally from about 0.01 ppm to about 50 ppm. Use of phloroglucinol is not confined to low, moderateorhigh pressure boiler systems, but maybe utilized in a wide variety of other systems where aqueous solutions containing dissolved air and/oroxygen are in contact with metal surfaces. The precise dosage used in each system will be somewhat dependent on the particular system and the water characteristics therein.The preferred system water (which may contain small amounts of certain additives normally used in systems such as boiler water systems for control of corrosion, scaling, sedimentation, pH, hardness and the like) consists essentially of water containing dissolved oxygen. In boiler water systems where addition is made to feedwaterwhich will not be further aerated before it enters the boiler, a weight ratio of phioroglucinol-related compound to oxygen dissolved in the feedwater is preferably between about 1:1 to about20:1; most preferably about 5:1. The pH of such systems is preferably kept between 8 and 12.
The phloroglucinol-related compounds employed in the process ofthis invention can typically be added to the system water by conventional bypass feeders using briquettes containing the additives, by feeding the compounds as dry powder mixtures to the water, or by feeding the treatment compounds as an aqueousfeed solution. Feed solutions, when used, may contain alcohol orothersolventsto enhancesolubility,and preferably contain 0.1 to 5 percent by weight of phloroglucinol-related scavenger; most preferably 0.5 to 1 weight percent thereof. Where, as in many boiler systems, make-up water is added to the aqueous solution, calibrated injecters can be employed to deliver predetermined amounts of the phlornglucinol-related compounds, periodically or continuously, to the aqueous solution via the make-up water line. While the scavengers may be added at locations throughoutthe system,the addition is preferably made at a location where there is little opportunity for additional aeration of the solution before it contacts the metal components to be protected. For example, in boiler systems, addition is preferably madetothefeedwaterat a location where the feedwaterwill not be exposed to substantial aeration before it enters the boiler.
Examples of such locations might includethefeedwater line itself, or depending upon the boiler system design, through return condensate lines or make-up water lines.
The examples describe particular embodiments of the invention. Other embodiments will be apparentto those skilled in the art from a consideration ofthe specification or practice of the invention disclosed herein. It is understood that modifications and variations may be practiced without departing from the spirit and scope of the novel concepts of this invention. It is further understood that the invention is not confined to the particular formulations and examples herein illustrated, but it embraces such modified forms thereof as come within the scope ofthefollowing claims.
Claims (13)
1. A method for control of corrosion of one or more metals in contact with an aqueous solution which comprises adding to the aqueous solution phloroglucinol or derivative thereof, of the formula:
wherein each of Rq, R2 and R3, which may be the same or different, represents hydrogen or an alkyl group having 1 to 8 carbon atoms, ora water soluble saltthereof, or a tautomericform thereof, as oxygen scavenger.
2. A method according to claim 1 wherein the scavenger is added at a dosage of 0.001 ppm to about 500 ppm.
3. A method according to claim 2 wherein the scavenger is added at a dosage of 0.01 ppm to 50 ppm.
4. A method according to claim 3 wherein the scavenger is added at a dosage of approximately 20 ppm.
5. A method according to any one of the preceding claims wherein the scavenger is phloroglucinol ora water-soluble salt thereof.
6. A method according to any one ofthe preceding claims wherein the aqueous solution is boilerwater for a boiler system.
7. A method according to claim 6 wherein the scavenger is added at a location wherein there is no substantial further aeration of the water before it enters the boiler, and in a weight ratio to oxygen in the boilerfeedwateroffrom 1:1 to 20:1.
8. A method according to claim 7 wherein the scavenger is added in a weight ratio to oxygen in the boiler feedwater of about 5:1.
9. A method according to any one of claims 6 to 8 wherein the scavenger is added to the boilerfeedwater and thefeedwater is adjusted to a pH of 8to 12.
10. A method according to any one of claims 6to 9 wherein the boiler system is one designed to operate at at least 150 psig and at at least 2980F and has iron and steel components in contact with the boilerwater.
11. A method according to any one of claims 6to 9 wherein the boiler system is one designed to operate at at least 375 psig and the scavenger is phloroglucinol, added at a dosage of approximately 20 ppm.
12. A method according to claim 11 wherein the phioroglucinol is added in a weight ratio to the oxygen dissolved in the boilerfeedwater of approximately 5:1.
13. A method according to claim 1 substantially as described in the Example.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US85656086A | 1986-04-28 | 1986-04-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8709922D0 GB8709922D0 (en) | 1987-06-03 |
| GB2189781A true GB2189781A (en) | 1987-11-04 |
Family
ID=25323948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08709922A Withdrawn GB2189781A (en) | 1986-04-28 | 1987-04-27 | Control of corrosion in aqueous systems |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS62260079A (en) |
| AU (1) | AU7190487A (en) |
| CA (1) | CA1295529C (en) |
| GB (1) | GB2189781A (en) |
| ZA (1) | ZA872662B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2196991B (en) * | 1985-05-28 | 1990-03-28 | Kurita Water Ind Ltd | Method for removal of patina |
| US5512243A (en) * | 1995-04-11 | 1996-04-30 | Betz Laboratories, Inc. | Cyclohexanedione oxygen scavengers |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2138796A (en) * | 1982-01-27 | 1984-10-31 | Leuna Werke Veb | Preventing corrosion |
-
1987
- 1987-04-14 ZA ZA872662A patent/ZA872662B/en unknown
- 1987-04-23 AU AU71904/87A patent/AU7190487A/en not_active Abandoned
- 1987-04-25 JP JP62101167A patent/JPS62260079A/en active Pending
- 1987-04-27 CA CA000535662A patent/CA1295529C/en not_active Expired - Lifetime
- 1987-04-27 GB GB08709922A patent/GB2189781A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2138796A (en) * | 1982-01-27 | 1984-10-31 | Leuna Werke Veb | Preventing corrosion |
Non-Patent Citations (2)
| Title |
|---|
| DESAI. M.N.; THANKI. G.H. INDIAN JOURNAL OF APPLIED CHEM; (70)P277-84 VOL 33 NO 5 * |
| TALATI, J.D.; MODI, R.M. INDIAN JOURNAL OF TECHNOLOGY.; (82)P305-11, VOL 20 NO 8 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2196991B (en) * | 1985-05-28 | 1990-03-28 | Kurita Water Ind Ltd | Method for removal of patina |
| US5512243A (en) * | 1995-04-11 | 1996-04-30 | Betz Laboratories, Inc. | Cyclohexanedione oxygen scavengers |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62260079A (en) | 1987-11-12 |
| ZA872662B (en) | 1987-10-02 |
| GB8709922D0 (en) | 1987-06-03 |
| CA1295529C (en) | 1992-02-11 |
| AU7190487A (en) | 1987-10-29 |
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