WO2022172279A1 - Composé dioléyle inhibant la corrosion, et formulation d'amine de celui-ci formant un film inhibant la corrosion - Google Patents
Composé dioléyle inhibant la corrosion, et formulation d'amine de celui-ci formant un film inhibant la corrosion Download PDFInfo
- Publication number
- WO2022172279A1 WO2022172279A1 PCT/IN2021/050346 IN2021050346W WO2022172279A1 WO 2022172279 A1 WO2022172279 A1 WO 2022172279A1 IN 2021050346 W IN2021050346 W IN 2021050346W WO 2022172279 A1 WO2022172279 A1 WO 2022172279A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- corrosion inhibiting
- compound
- dioleyl
- corrosion
- amine
- Prior art date
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 75
- 230000007797 corrosion Effects 0.000 title claims abstract description 75
- 150000001412 amines Chemical class 0.000 title claims abstract description 54
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 51
- 150000001875 compounds Chemical class 0.000 title claims abstract description 42
- 239000000203 mixture Substances 0.000 title claims abstract description 32
- 238000009472 formulation Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000004821 distillation Methods 0.000 claims abstract description 10
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 5
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 18
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 claims description 18
- QGLWBTPVKHMVHM-KTKRTIGZSA-N (z)-octadec-9-en-1-amine Chemical compound CCCCCCCC\C=C/CCCCCCCCN QGLWBTPVKHMVHM-KTKRTIGZSA-N 0.000 claims description 15
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 claims description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000011541 reaction mixture Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- UUFQTNFCRMXOAE-UHFFFAOYSA-N 1-methylmethylene Chemical compound C[CH] UUFQTNFCRMXOAE-UHFFFAOYSA-N 0.000 claims description 6
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 230000003197 catalytic effect Effects 0.000 claims description 3
- 229940093499 ethyl acetate Drugs 0.000 claims description 3
- 235000019439 ethyl acetate Nutrition 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000012044 organic layer Substances 0.000 claims description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 3
- 239000012279 sodium borohydride Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims 1
- 238000004231 fluid catalytic cracking Methods 0.000 abstract description 4
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 29
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 8
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 8
- 238000003380 quartz crystal microbalance Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 125000001117 oleyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])/C([H])=C([H])\C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 125000002015 acyclic group Chemical group 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000425 proton nuclear magnetic resonance spectrum Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000003568 thioethers Chemical class 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
- C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/24—Preparation of compounds containing amino groups bound to a carbon skeleton by reductive alkylation of ammonia, amines or compounds having groups reducible to amino groups, with carbonyl compounds
- C07C209/28—Preparation of compounds containing amino groups bound to a carbon skeleton by reductive alkylation of ammonia, amines or compounds having groups reducible to amino groups, with carbonyl compounds by reduction with other reducing agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G7/00—Distillation of hydrocarbon oils
- C10G7/10—Inhibiting corrosion during distillation
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G75/00—Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general
- C10G75/02—Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of corrosion 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
- C23F11/141—Amines; Quaternary ammonium compounds
Definitions
- the present invention describes a corrosion inhibiting dioleyl compound and synthesis process for preparing the said dioleyl compound. Further, the present invention also describes corrosion inhibiting fdm forming amine formulation prepared from the said dioleyl compound. Wherein, the said corrosion inhibiting film forming amine formulation is used for inhibiting corrosion of metal surfaces, especially, inhibiting corrosion of crude oil units.
- HC1 gas To mitigate this corrosion as caused by HC1 gas, some neutralizing amines and film forming amines are dosed at overhead section of the crude unit.
- the mechanism of film forming amine are the formation of a film which can act as a hydrophobic barrier against corrosive species, such as, HC1.
- the US20160002793 A 1 discloses a method and compositions for inhibiting corrosion on metal surfaces of gas turbine air compressors.
- the methods comprise contacting the metal surfaces with a corrosion inhibiting composition comprising at least one filming amine.
- a corrosion inhibiting composition comprising at least one filming amine.
- a polyamine of formula H2N-((CH2)x -NH)y - R1 is also disclosed, wherein, x ranges from about 1 to about 8; y ranges from about 0 to about 7; and R1 is a saturated or unsaturated aliphatic C12-C24 hydrocarbon radical.
- the filming amine as used herein may be any material that forms an organic film on metal surfaces thereby preventing corrosive and oxidizing materials from contacting the metal surfaces.
- W02020174607A1 discloses a method for providing corrosion protection to a water-steam circuit having both internal surfaces made of aluminium or aluminium alloy and internal surfaces made of steel.
- the said method comprises operating the water-steam circuit with water having a pH value, measured at 22°C, in the range of pH 8.8 to 10.0, in particular in the range of pH 9.0 to 9.6, especially in the range of pH 9.2 to 9.6 and containing a film forming amine.
- Oleyl amine/oleyl 1,3 diamine acts as barrier for the corrosive species and thus protects the metal surfaces.
- the objective of the present invention is to provide an easily synthesizable dioleyl compound for inhibiting the corrosion of metal surfaces.
- the main objective of the present invention is to provide a method for synthesizing a corrosion inhibiting dioleyl compound for inhibiting corrosion in the crude distillation units/hydro treating units/fluid catalytic cracking units.
- the specific objective of the present invention is to provide a corrosion inhibiting film forming amine formulation for inhibiting corrosion of metal surfaces, especially, corrosion caused by HC1 gas in the crude oil units.
- the present invention discloses a corrosion inhibiting dioleyl compound and a method for synthesizing the said corrosion inhibiting dioleyl compound.
- the corrosion inhibiting dioleyl compound is prepared by firstly preparing a reaction mixture by adding oleyl amine (14gm) into acetyl acetone (5gm) and stirring for 6 hours at 60°C. Then adding the solution of the said reaction mixture in 200ml methanol, and then treating with sodium borohydride at 0°C, and then warming to Reaction Temperature (RT) and stirred at Reaction Temperature (RT) for 12 hours. Thereafter, the final compound is diluted with ethylacetate and washed with a washing agent.
- the present invention also discloses a process for preparing a corrosion inhibiting formulation.
- the process includes preparing an amine solution of Cyclohexylamine, Ethanolamine (MEA) and Morpholine, all taken in equal ratios. Further, the corrosion inhibiting dioleyl compound as prepared above is added in the said amine solution.
- the said amine solution is 90-99 weight percent and corrosion inhibiting dioleyl compound of Formula-1 is 1-10 weight percent.
- the ratio of the said amine solution and the corrosion inhibiting dioleyl compound is 95:5 weight percent. Then, the solution as obtained is stirred for 20 minutes to obtain the said corrosion inhibiting formulation.
- the present invention also discloses use of the said corrosion inhibiting dioleyl compound in the said corrosion inhibiting formulation to control corrosion of a crude distillation unit, a hydrocarbon treating unit, and/or a fluid catalytic unit.
- Fig. 2 Illustrates the rate of mass change due to adsorption on a SS-coated quartz crystal for different film forming amine formulations.
- the present invention also discloses a method for synthesizing the said corrosion inhibiting dioleyl compound.
- the corrosion inhibiting dioleyl compound is prepared by firstly preparing a reaction mixture by adding oleyl amine (14g) into a solution of acetyl acetone and then stirring the said reaction mixture for 6 hours at 60°C.
- the corrosion inhibiting dioleyl compound of Formula- 1 as prepared hereinabove is added in the said amine solution.
- the ratio of the said amine solution and the corrosion inhibiting dioleyl compound is 95:5 weight percent.
- the solution as obtained is stirred for 20 minutes to obtain the said film forming amine formulation.
- the said fdm forming amine formulation is used to control corrosion of a crude distillation unit, a hydrocarbon treating unit, a fluid catalytic unit especially protecting these units from the acidic by-products such as HC1.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
La présente invention concerne un composé dioléyle inhibiteur de corrosion, un procédé pour le synthétiser et une formulation d'amine formant un film inhibant la corrosion préparée à partir dudit composé dioléyle. Ladite formulation d'amine formant un film inhibant la corrosion est utilisée pour inhiber la corrosion d'unités de distillation, d'unités d'hydro-traitement de pétrole brut et d'unités de craquage catalytique de fluide. Le composé dioléyle divulgué dans la présente invention peut être synthétisé facilement et réduit le coût global de préparation de la formulation d'amine formant un film inhibant la corrosion. De plus, la formulation d'amine formant un film inhibant la corrosion telle que préparée à partir dudit composé dioléyle présente d'excellentes propriétés d'inhibition de la corrosion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN202141006275 | 2021-02-15 | ||
| IN202141006275 | 2021-02-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022172279A1 true WO2022172279A1 (fr) | 2022-08-18 |
Family
ID=76355557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IN2021/050346 WO2022172279A1 (fr) | 2021-02-15 | 2021-04-07 | Composé dioléyle inhibant la corrosion, et formulation d'amine de celui-ci formant un film inhibant la corrosion |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2022172279A1 (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160002793A1 (en) | 2013-03-01 | 2016-01-07 | General Electric Company | Compositions and methods for inhibiting corrosion in gas turbine air compressors |
| EP3246380A1 (fr) * | 2016-05-18 | 2017-11-22 | Bharat Petroleum Corporation Ltd. | Régulation de la corrosion de distillat de tête dans une unité de production de pétrole brut au moyen de mélanges d'amines multiples |
| WO2020008477A1 (fr) * | 2018-07-04 | 2020-01-09 | Hindustan Petroleum Corporation Limited | Formulation d'amine de neutralisation et son procédé de préparation |
| WO2020051302A1 (fr) * | 2018-09-06 | 2020-03-12 | Ecolab Usa Inc. | Inhibiteurs de corrosion à base de propylènediamine oléylique |
| WO2020174607A1 (fr) | 2019-02-27 | 2020-09-03 | Kurita Water Industries Ltd. | Procédé pour fournir une protection contre la corrosion à un circuit eau-vapeur |
-
2021
- 2021-04-07 WO PCT/IN2021/050346 patent/WO2022172279A1/fr active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160002793A1 (en) | 2013-03-01 | 2016-01-07 | General Electric Company | Compositions and methods for inhibiting corrosion in gas turbine air compressors |
| EP3246380A1 (fr) * | 2016-05-18 | 2017-11-22 | Bharat Petroleum Corporation Ltd. | Régulation de la corrosion de distillat de tête dans une unité de production de pétrole brut au moyen de mélanges d'amines multiples |
| WO2020008477A1 (fr) * | 2018-07-04 | 2020-01-09 | Hindustan Petroleum Corporation Limited | Formulation d'amine de neutralisation et son procédé de préparation |
| WO2020051302A1 (fr) * | 2018-09-06 | 2020-03-12 | Ecolab Usa Inc. | Inhibiteurs de corrosion à base de propylènediamine oléylique |
| WO2020174607A1 (fr) | 2019-02-27 | 2020-09-03 | Kurita Water Industries Ltd. | Procédé pour fournir une protection contre la corrosion à un circuit eau-vapeur |
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