EP3337916A1 - Solution aqueuse de nettoyage pour l'élimination de dépôts de rouille rouge ("rouging") sur des surfaces d'aciers inoxydables en contact avec des milieux, utilisation de celle-ci et son procédé de préparation - Google Patents
Solution aqueuse de nettoyage pour l'élimination de dépôts de rouille rouge ("rouging") sur des surfaces d'aciers inoxydables en contact avec des milieux, utilisation de celle-ci et son procédé de préparationInfo
- Publication number
- EP3337916A1 EP3337916A1 EP16769870.3A EP16769870A EP3337916A1 EP 3337916 A1 EP3337916 A1 EP 3337916A1 EP 16769870 A EP16769870 A EP 16769870A EP 3337916 A1 EP3337916 A1 EP 3337916A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cleaning solution
- sulfite
- aqueous
- alkali metal
- component
- 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.)
- Granted
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 43
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000243 solution Substances 0.000 claims abstract description 52
- 235000019253 formic acid Nutrition 0.000 claims abstract description 30
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 21
- 150000001340 alkali metals Chemical group 0.000 claims abstract description 11
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 claims abstract description 9
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 16
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- -1 alkali metal sulfite Chemical class 0.000 claims description 10
- 235000010265 sodium sulphite Nutrition 0.000 claims description 7
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims description 6
- 235000019254 sodium formate Nutrition 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 229910001854 alkali hydroxide Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000004280 Sodium formate Substances 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 6
- 235000011121 sodium hydroxide Nutrition 0.000 description 11
- 238000007792 addition Methods 0.000 description 10
- 239000011734 sodium Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 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 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical class [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006172 buffering agent Substances 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 235000014510 cooky Nutrition 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000647 material safety data sheet Toxicity 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000008237 rinsing water Substances 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
-
- 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/06—Hydroxides
-
- 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
-
- 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
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/16—Metals
Definitions
- the present invention relates to an aqueous cleaning solution for removing Rougingbelägen on media-contacting surfaces of stainless steels according to the preamble of claim 1. Furthermore, the invention relates to a use of the inventive cleaning solution and a process for their preparation.
- Rouging Numerous plants in the pharmaceutical, biotechnology and food industries include piping systems for pure or ultrapure water or pure steam, which are usually made of austenitic stainless steels. It is generally known that the media-touched inner surfaces of such systems usually tempered after a service life of several weeks to months disgusting yellow, red to black violet, often reddish brown to rust-colored surface discoloration, which is referred to in the jargon as "rouging". Main constituents of rouging are various iron oxides and iron hydroxides with iron in the oxidation state +3, which may contain fractions of chromium, nickel and molybdenum.
- Rouging layers are detectable not only visually, but, for example, with a common Weisswischtuchtest and are more or less easily wiped depending on the severity. Rouging layers can lead to contamination of downstream systems by entrainment of the layer particles and are highly undesirable for this reason alone. Accordingly, the removal of Rougingbelägen, also called “derouging", an important aspect of the maintenance of the above-mentioned piping systems and the like. It is crucial that the Rougingbeläge in useful Deadline and as completely as possible, without the surface, such as the electropolishing, damaged.
- 4,789,406 (Holder) describes a derouging process in the pH range from 6.5 to 7.5, in which the affected surface is first pretreated with an organic reducing agent / complexing agent and subsequently treated in succession with an inorganic reducing agent, with an inorganic wetting agent and finally with rinsing water becomes.
- WO 2009/095475 A1 also describes the use of an aqueous neutral cleaning solution for removing rouging deposits on stainless steels.
- a cleaning solution which contains a reducing agent and at least one complexing agent.
- the object of the present invention was therefore to provide an improved aqueous cleaning solution for removing rouging deposits on media-contacting surfaces of stainless steels. Further objects of the invention are the specification of a use or a method for producing the inventive cleaning solution. The abovementioned objects are achieved according to the invention by the aqueous cleaning solution according to claim 1, by their use according to claim 5 and by the production method according to claim 7.
- Rouging coatings on media-contacting surfaces of stainless steels contain a first component and a second component, wherein the first component is an alkali metal sulfite and the second component is an alkali metal formate and their concentrations are adjusted such that formate to sulfite in a molar ratio of 1 .5 to 4.2 present, and that the pH of the cleaning solution is 4.0 to 4.8 (claim 1).
- the first component acts as a complexing reducing agent and the second component acts as a buffering agent.
- formate to sulfite in a molar ratio of 1 .5 to 2.5 before and the pH of the cleaning solution is 4.3 to 4.7.
- formate to sulfite are present in a molar ratio of 3.0 to 4.2 and the pH of the cleaning solution is 4.1 to 4.5 (claim 2).
- any compound of the formula M 2 SO 3 is suitable as the alkali metal sulfite
- any compound of the formula HC (O) OM is suitable as the alkali metal formate, where M is one of the nonradioactive alkali metals (Li, Na, K, Rb, Cs).
- M is one of the nonradioactive alkali metals (Li, Na, K, Rb, Cs).
- Na sodium
- K potassium
- Na 2 SO 3 is one of the sulfites used by the food industry as a food additive; Na 2 SO 3 is approved under the European approval number E 221 in the additive classes of antioxidants and preservatives.
- the proportions of the individual components in the aqueous cleaning solution should be selected so that the molar ratio of formate to sulfite in the range of 1 .5 to 4.2, and in particular is about 3.0 to 4.2.
- the pH of the cleaning solution should be adjusted to a value in the range from 4.0 to 4.8, in particular to pH 4.1 to 4.5. This ensures that the electrochemical potential of the solution remains stable in the range of -225 to -320 mV. A negative potential of this magnitude means that there is a sufficiently strong reduction effect for the desired derouging effect. It has been found that the optimum pH depends somewhat on the method: in the dipping process, a pH of about 4.5 is preferred, while in the spraying process a somewhat low pH of about 4.1 is advantageous.
- a highly effective derusting solution can be provided for media-contacting surfaces of stainless steels and that this solution is also capable of removing rust deposits on surfaces of unalloyed and low-alloyed steels.
- this derouging solution consists of environmentally friendly and inexpensive substances.
- Another aspect of the invention relates to the use of the inventive cleaning solution for removing Rougingbelägen on media-contacting surfaces of stainless steels selected from the group of chromium / nickel and chromium / nickel / molybdenum steels (claim 5).
- Rougingbeläge can be removed with the inventive cleaning solution already at room temperature. In other situations, however, necessary to work at elevated temperature, which, however, both for safety reasons and also to avoid a quick we- should be limited kung loss for evaporating formic acid to about 80 Q C.
- the cleaning solution can be effectively used in a very broad concentration range.
- the sulfite concentration can be in the range from 0.05 to 1 .5 mol / kg (claim 4). At comparatively low concentrations usually require a longer exposure time, whereas solubility problems can occur at excessively high concentrations. Accordingly, in an advantageous embodiment, the sulfite concentration is 0.1 to 1 mol / kg, preferably 0.3 to 0.5 mol / kg.
- the cleaning solution according to the invention can be prepared by adding the required amounts of alkali metal sulphite and alkali metal formate to an aqueous receiver and adjusting the required pH by means known per se.
- the pH can be adjusted by addition of formic acid and / or an alkali metal hydroxide.
- an aqueous solution of an alkali metal hydroxide is introduced and subsequently a first amount of concentrated aqueous formic acid is admixed in an excess such that a pH of from 3.5 to 4.5 is established.
- a second amount of solid alkali metal sulfite is mixed according to the sulfite concentration to be adjusted, resulting in a pH of 5.5 to 6.5, and finally a third amount of concentrated aqueous formic acid is added until reaching a pH of 4.0 to 4.8.
- the optimum pH depends somewhat on the type of process: in the dipping process, a pH of about 4.5 is preferred, while in the spraying process a somewhat low pH of about 4.1 is advantageous.
- concentrated aqueous formic acid in the present case is to be understood as meaning an aqueous solution of formic acid having a concentration of at least 50 to about 95% by weight. If required, this can be prepared from highly concentrated, ie approximately 100%, formic acid. The order of the additions must be strictly observed because of side reactions of the S0 3 2 " and because of the solubility of the individual components It is understood that in the production process according to the invention the addition of the alkali hydroxide and of formic acid corresponds to the apparently more simple addition of alkali metal formate In the manufacturing process it has been found that the method according to the invention is comparatively inexpensive and simple.
- sodium hydroxide NaOH
- the initially introduced aqueous sodium hydroxide solution has a concentration of from 0.9 to 1 .1 mol / kg and the added aqueous formic acid has a concentration of from 80 to 100% by weight, preferably approximately 85% by weight (Claim 9) ).
- the ready-to-use cleaning solution can be prepared and stored in advance, wherein heating of the cleaning solution, for example by sunlight, is to be avoided in order to avoid an undesirable loss of effectiveness.
- the admixing of the third amount immediately before use made (claim 10).
- the comparatively complex mixing of alkali metal hydroxide and formic acid and the subsequent addition of alkali metal sulfite in a suitable factory environment can be carried out, and the precursor prepared in this way is readily storable and also no hazardous substance.
- the completion of the cleaning solution can then take place immediately before use and preferably at the site. It is understood that the present and following statements in mol or mol / kg in the practical implementation in weights or weight concentrations can be converted by the molecular weights of the species concerned are taken into account.
- aqueous NaOH solution sodium hydroxide solution
- 7 kg of an 85% strength by weight aqueous formic acid are gradually added with stirring, whereupon a pH value of about 4 is established with an increase in temperature to 35 ° C.
- 5 kg of solid sodium sulfite Na 2 S0 3
- HCOOH 85% another 1 to 2 kg of aqueous formic acid (HCOOH 85%) are added, the addition being metered so as to give a pH of 4.5 to 4.1 (depending on the type of process, see Example 4).
- the cleaning solution thus obtained should have an electrochemical potential of -50 to -350 mV.
- Example 4 Derouging method
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Detergent Compositions (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI201630387T SI3337916T1 (sl) | 2015-08-19 | 2016-08-19 | Vodna čistilna raztopina za odstranjevanje rouging oblog na površinah nerjavnih jekel, ki so v stiku s sredstvi, uporaba le-te in postopek za njeno izdelavo |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15181647 | 2015-08-19 | ||
PCT/EP2016/069742 WO2017029405A1 (fr) | 2015-08-19 | 2016-08-19 | Solution aqueuse de nettoyage pour l'élimination de dépôts de rouille rouge ("rouging") sur des surfaces d'aciers inoxydables en contact avec des milieux, utilisation de celle-ci et son procédé de préparation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3337916A1 true EP3337916A1 (fr) | 2018-06-27 |
EP3337916B1 EP3337916B1 (fr) | 2019-06-12 |
Family
ID=53938184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16769870.3A Active EP3337916B1 (fr) | 2015-08-19 | 2016-08-19 | Solution de nettoyage aqueuse destinée à éliminer rouging sur des surfaces en contact avec le fluide d'aciers inoxydables, son utilisation et son procédé de fabrication |
Country Status (7)
Country | Link |
---|---|
US (3) | US20180371379A1 (fr) |
EP (1) | EP3337916B1 (fr) |
JP (1) | JP2018525535A (fr) |
CN (1) | CN108474122A (fr) |
DK (1) | DK3337916T3 (fr) |
SI (1) | SI3337916T1 (fr) |
WO (1) | WO2017029405A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT525928A1 (de) | 2022-03-11 | 2023-09-15 | Henkel Bet Holding Gmbh | Verfahren zur Entfernung eisenoxidischer Ablagerungen |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4789406A (en) | 1986-08-20 | 1988-12-06 | Betz Laboratories, Inc. | Method and compositions for penetrating and removing accumulated corrosion products and deposits from metal surfaces |
CA2271292C (fr) * | 1996-11-13 | 2007-04-10 | Ashland Inc. | Nettoyant liquide pour metaux pour systeme aqueux |
GB9909724D0 (en) * | 1998-09-25 | 1999-06-23 | Macgregor Keith M | Medical cleaning compositions |
CN100503800C (zh) * | 2006-06-05 | 2009-06-24 | 太仓市宝马环境工程有限公司 | 单乙醇胺再生器清洗剂及其制备方法 |
US8192550B2 (en) * | 2008-02-01 | 2012-06-05 | Ateco Services Ag | Use of an aqueous neutral cleaning solution and method for removing rouging from stainless steel surfaces |
EP2090676A1 (fr) | 2008-02-01 | 2009-08-19 | Ateco Services AG | Procédé destiné l'enlèvement de couches et de dépôts |
US8691743B2 (en) * | 2008-05-14 | 2014-04-08 | Novozymes A/S | Liquid detergent compositions |
US9029313B2 (en) * | 2012-11-28 | 2015-05-12 | Ecolab Usa Inc. | Acidic viscoelastic surfactant based cleaning compositions comprising glutamic acid diacetate |
JP5721888B1 (ja) * | 2014-07-04 | 2015-05-20 | 三菱日立パワーシステムズ株式会社 | 化学洗浄方法及び化学洗浄装置 |
US9617502B2 (en) * | 2014-09-15 | 2017-04-11 | The Procter & Gamble Company | Detergent compositions containing salts of polyetheramines and polymeric acid |
-
2016
- 2016-08-19 US US15/753,333 patent/US20180371379A1/en not_active Abandoned
- 2016-08-19 SI SI201630387T patent/SI3337916T1/sl unknown
- 2016-08-19 DK DK16769870.3T patent/DK3337916T3/da active
- 2016-08-19 WO PCT/EP2016/069742 patent/WO2017029405A1/fr active Application Filing
- 2016-08-19 JP JP2018528093A patent/JP2018525535A/ja active Pending
- 2016-08-19 EP EP16769870.3A patent/EP3337916B1/fr active Active
- 2016-08-19 CN CN201680059246.3A patent/CN108474122A/zh active Pending
-
2021
- 2021-08-01 US US17/390,977 patent/US20220056381A1/en not_active Abandoned
-
2023
- 2023-12-13 US US18/538,016 patent/US20240209291A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JP2018525535A (ja) | 2018-09-06 |
CN108474122A (zh) | 2018-08-31 |
SI3337916T1 (sl) | 2019-11-29 |
WO2017029405A1 (fr) | 2017-02-23 |
EP3337916B1 (fr) | 2019-06-12 |
DK3337916T3 (da) | 2019-09-23 |
US20180371379A1 (en) | 2018-12-27 |
US20220056381A1 (en) | 2022-02-24 |
US20240209291A1 (en) | 2024-06-27 |
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