CA2207406A1 - A process for cleaning a tank - Google Patents
A process for cleaning a tankInfo
- Publication number
- CA2207406A1 CA2207406A1 CA002207406A CA2207406A CA2207406A1 CA 2207406 A1 CA2207406 A1 CA 2207406A1 CA 002207406 A CA002207406 A CA 002207406A CA 2207406 A CA2207406 A CA 2207406A CA 2207406 A1 CA2207406 A1 CA 2207406A1
- Authority
- CA
- Canada
- Prior art keywords
- tank
- copper
- cleaning
- agent
- strong organic
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004140 cleaning Methods 0.000 title claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000008139 complexing agent Substances 0.000 claims abstract description 6
- 239000005749 Copper compound Substances 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- 150000001880 copper compounds Chemical class 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims abstract description 3
- 150000007530 organic bases Chemical class 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 6
- 150000001879 copper Chemical class 0.000 claims description 5
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- STIAPHVBRDNOAJ-UHFFFAOYSA-N carbamimidoylazanium;carbonate Chemical compound NC(N)=N.NC(N)=N.OC(O)=O STIAPHVBRDNOAJ-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 150000007529 inorganic bases Chemical class 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/38—Cationic compounds
- C11D1/50—Derivatives of urea, thiourea, cyanamide, guanidine or urethanes
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/26—Organic compounds containing nitrogen
- C11D3/30—Amines; Substituted amines ; Quaternized amines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- C11D2111/20—
Abstract
The present invention relates to a process for cleaning a tank, in particular a steam boiler.
Using this process, copper and copper compounds present in deposits are dissolved out. To this end, a complexing agent and a strong organic agent, preferably guanadine carbonate, are introduced into the tank. Soluble copper complexes form in aqueous solution. After this, the tank is emptied.
Using this process, copper and copper compounds present in deposits are dissolved out. To this end, a complexing agent and a strong organic agent, preferably guanadine carbonate, are introduced into the tank. Soluble copper complexes form in aqueous solution. After this, the tank is emptied.
Description
A Process for Cleaning a Tank The present invention relates to a process for cleaning a tank, in particular a steam boiler, whereby a complexing agent and an alkalyzing agent are introduced into the tank in order to dissolve copper and copper compounds that are present in deposits within the tank and form 5 soluble copper complexes in aqueous solution, after which the tank is emptied.
A process for cleaning a tank, in which copper compounds are dissolved out of deposits by forming copper complexes is described in EP 0 198 340 B1. In this case, ethylene~ mine is used as the complexing agent, and ammonia is used as the alkalyzing agent. Ammonium lo carbonate can also be added in order to accelerate the chemical reaction. In this process, the ammonia can be replaced by ammonium carbonate.
In such a process, the ammonia must be added continuously in the case of processes that last a longer time, since it leaves the cleaning solutions in the form of gas.
If soluble iron compounds are present, even at the trace level, in the presence of ammonia these can act on the materials consisting of iron-copper alloy used in the tank and dissolve copper out of the tank material.
20 It is the task of the present invention to describe a process for cleaning a tank, in which the tank, which is of an iron-copper alloy or contains such an alloy, is not attacked.
According to the present invention, this problem has been solved in that a strong organic base is used as the alkalyzing agent.
It is more advantageous if an alkalyzing agent that can the replace the ammonium completely be used. The strong organic base does not attack the container material that is of an iron-copper alloy, so that metallic copper and copper compounds that are present in deposits within the tank can be removed from tanks made of such a material, particularly steam boilers.
Furthermore, a strong organic base does not leave the cleaning solution in the form of gas, so that it is not necessary to add it continuously. As a consequence, smaller quantities of chemicals can be used and process-technology costs can be reduced, which means that the cleaning process is particularly economical.
Using a strong organic base as opposed to a strong inorganic base, for example, NaOH, one achieves the advantage that the strong organic base does not form any salts that could attack the material used for the tank.
5 As an example, guanidine carbonate can be introduced into the tank as the strong organic base. This is a crystalline substance, and for this reason it is easy to handle. In particular, guanadine carbonate is a strong organic base that is inexpensive, so that the cleaning process can be completed very economically by using it.
20 As an example, ethylenediamine is introduced into the tank as the complexing agent. A
suitable temperature for the cleaning process lies, for example, between 20~ and 100~ Celsius.
The pH value can be adjusted to a value greater than 10 by addition of the alkalyzing agent.
Using these measures, that are cited as examples, is possible to further improve the cleaning process.
As an example, during the formation of copper complexes, pressurizing gas with an oxygen 5 concentration of up to 100 percent is introduced into the tank in order to bring about a mixing effect and/or to modify the pressure. The pressurizing gas can also be released from the tanks for the same purpose.
Using the process according to the present inventionone achieves the advantage that the o iron-copper alloys that can be used for the tank or part of the tank are not attacked.
A process for cleaning a tank, in which copper compounds are dissolved out of deposits by forming copper complexes is described in EP 0 198 340 B1. In this case, ethylene~ mine is used as the complexing agent, and ammonia is used as the alkalyzing agent. Ammonium lo carbonate can also be added in order to accelerate the chemical reaction. In this process, the ammonia can be replaced by ammonium carbonate.
In such a process, the ammonia must be added continuously in the case of processes that last a longer time, since it leaves the cleaning solutions in the form of gas.
If soluble iron compounds are present, even at the trace level, in the presence of ammonia these can act on the materials consisting of iron-copper alloy used in the tank and dissolve copper out of the tank material.
20 It is the task of the present invention to describe a process for cleaning a tank, in which the tank, which is of an iron-copper alloy or contains such an alloy, is not attacked.
According to the present invention, this problem has been solved in that a strong organic base is used as the alkalyzing agent.
It is more advantageous if an alkalyzing agent that can the replace the ammonium completely be used. The strong organic base does not attack the container material that is of an iron-copper alloy, so that metallic copper and copper compounds that are present in deposits within the tank can be removed from tanks made of such a material, particularly steam boilers.
Furthermore, a strong organic base does not leave the cleaning solution in the form of gas, so that it is not necessary to add it continuously. As a consequence, smaller quantities of chemicals can be used and process-technology costs can be reduced, which means that the cleaning process is particularly economical.
Using a strong organic base as opposed to a strong inorganic base, for example, NaOH, one achieves the advantage that the strong organic base does not form any salts that could attack the material used for the tank.
5 As an example, guanidine carbonate can be introduced into the tank as the strong organic base. This is a crystalline substance, and for this reason it is easy to handle. In particular, guanadine carbonate is a strong organic base that is inexpensive, so that the cleaning process can be completed very economically by using it.
20 As an example, ethylenediamine is introduced into the tank as the complexing agent. A
suitable temperature for the cleaning process lies, for example, between 20~ and 100~ Celsius.
The pH value can be adjusted to a value greater than 10 by addition of the alkalyzing agent.
Using these measures, that are cited as examples, is possible to further improve the cleaning process.
As an example, during the formation of copper complexes, pressurizing gas with an oxygen 5 concentration of up to 100 percent is introduced into the tank in order to bring about a mixing effect and/or to modify the pressure. The pressurizing gas can also be released from the tanks for the same purpose.
Using the process according to the present inventionone achieves the advantage that the o iron-copper alloys that can be used for the tank or part of the tank are not attacked.
Claims (7)
1. A process for cleaning a tank, in particular a steam boiler, whereby in order to dissolve copper and copper compounds out of deposits within the tank, a complexing agent and an alkalyzing agent are added to the tank in order to form soluble copper complexes in aqueous solution, after which the tank is emptied, characterized in that a strong organic base is used as the alkalyzing agent.
2. A process as defined in Claim 1, characterized in that guanidine carbonate is used as the strong organic base.
3. A process as defined in Claim 1 or Claim 2, characterized in that ethylenediamine is introduced into the tank as the complexing agent.
4. A process as defined in Claim 1 to Claim 3, characterized in that the temperature is between 20° Celsius and 100° Celsius.
5. A process as defined in Claim 1 to Claim 4, characterized in that the pH value is greater than 10.
6. A process as defined in Claim 1 to Claim 5, characterized in that during the formation of copper complexes, pressurizing gas with an oxygen concentration of up to 100 per cent is introduced into the tank in order to bring about a mixing effect and/or to modify the pressure.
7. A process as defined in Claim 6, characterized in that the pressurizing gas is removed from the tank.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19623390.9 | 1996-06-12 | ||
| DE19623390A DE19623390C1 (en) | 1996-06-12 | 1996-06-12 | Process for cleaning a vessel, especially a steam generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2207406A1 true CA2207406A1 (en) | 1997-12-12 |
Family
ID=7796709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002207406A Abandoned CA2207406A1 (en) | 1996-06-12 | 1997-06-10 | A process for cleaning a tank |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2207406A1 (en) |
| DE (1) | DE19623390C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6554006B2 (en) | 2000-12-22 | 2003-04-29 | General Electric Company | Piping deposit removal from stator water cooling systems |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1289720B (en) * | 1964-01-16 | 1969-02-20 | Collardin Gmbh Gerhard | Preparations for removing copper from and cleaning metal surfaces |
-
1996
- 1996-06-12 DE DE19623390A patent/DE19623390C1/en not_active Expired - Fee Related
-
1997
- 1997-06-10 CA CA002207406A patent/CA2207406A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6554006B2 (en) | 2000-12-22 | 2003-04-29 | General Electric Company | Piping deposit removal from stator water cooling systems |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19623390C1 (en) | 1998-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |