CN114622205A - Neutralization corrosion inhibitor for refinery and preparation method thereof - Google Patents
Neutralization corrosion inhibitor for refinery and preparation method thereof Download PDFInfo
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- 230000007797 corrosion Effects 0.000 title claims abstract description 52
- 238000005260 corrosion Methods 0.000 title claims abstract description 52
- 239000003112 inhibitor Substances 0.000 title claims abstract description 37
- 238000006386 neutralization reaction Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 5
- UYMKPFRHYYNDTL-UHFFFAOYSA-N ethenamine Chemical compound NC=C UYMKPFRHYYNDTL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 150000004668 long chain fatty acids Chemical class 0.000 claims abstract description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 10
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 9
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 claims description 8
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 4
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 4
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 4
- 239000005642 Oleic acid Substances 0.000 claims description 4
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 4
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 4
- LSHROXHEILXKHM-UHFFFAOYSA-N n'-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethyl]ethane-1,2-diamine Chemical compound NCCNCCNCCNCCNCCN LSHROXHEILXKHM-UHFFFAOYSA-N 0.000 claims description 4
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 4
- 235000021313 oleic acid Nutrition 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 claims description 3
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 claims description 3
- 235000020778 linoleic acid Nutrition 0.000 claims description 3
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- AQGNVWRYTKPRMR-UHFFFAOYSA-N n'-[2-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethylamino]ethyl]ethane-1,2-diamine Chemical compound NCCNCCNCCNCCNCCNCCN AQGNVWRYTKPRMR-UHFFFAOYSA-N 0.000 claims description 3
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 2
- CFPHMAVQAJGVPV-UHFFFAOYSA-N 2-sulfanylbutanoic acid Chemical compound CCC(S)C(O)=O CFPHMAVQAJGVPV-UHFFFAOYSA-N 0.000 claims description 2
- 235000021314 Palmitic acid Nutrition 0.000 claims description 2
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 claims description 2
- 235000020661 alpha-linolenic acid Nutrition 0.000 claims description 2
- 229960004488 linolenic acid Drugs 0.000 claims description 2
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 claims description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 230000005764 inhibitory process Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 abstract description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract description 5
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 abstract description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 abstract description 4
- 125000003368 amide group Chemical group 0.000 abstract description 3
- 125000004434 sulfur atom Chemical group 0.000 abstract description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 abstract description 2
- 235000019253 formic acid Nutrition 0.000 abstract description 2
- 235000014113 dietary fatty acids Nutrition 0.000 abstract 1
- 229930195729 fatty acid Natural products 0.000 abstract 1
- 239000000194 fatty acid Substances 0.000 abstract 1
- -1 sulfhydryl fatty acid Chemical class 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000010779 crude oil Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 125000002636 imidazolinyl group Chemical group 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000005580 one pot reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000005292 vacuum distillation Methods 0.000 description 2
- 238000007112 amidation reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000002462 imidazolines Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229960001124 trientine Drugs 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a neutralization corrosion inhibitor for refineries and a preparation method thereof, wherein the neutralization corrosion inhibitor for refineries comprises water-soluble imidazoline which is prepared by the following method: mixing the raw materials according to the proportion, firstly reacting for 2-4 hours at the temperature of 130-; the raw materials and the molar ratio are as follows: 1-2mol of 16-18 long-chain fatty acid; 1-2mol of ethylene amine; 1-2mol of formic acid and/or acetic acid; 1-2mol of sulfhydryl fatty acid; 0.2-1mol of dimethylbenzene and/or methylbenzene. According to the invention, water-soluble groups such as amide groups and the like are introduced into the structure of the water-soluble imidazoline, so that the water solubility of the imidazoline is improved, and meanwhile, sulfur atoms are introduced into the molecular structure, so that the corrosion inhibition effect of the product is further improved. The water-soluble imidazoline in the neutralization corrosion inhibitor for refineries is stable in water solubility in use, so that the corrosion inhibitor has obvious corrosion inhibition effect in use.
Description
Technical Field
The invention relates to a neutralization corrosion inhibitor for refineries and a preparation method thereof, in particular to a preparation method of water-soluble imidazoline.
Background
At present, the crude oil processing capacity of China reaches 1.2 multiplied by 103Mt/a, ten million ton-grade refineries reach 24 families, and the total oil refining amount is increased year by year along with the further expansion of oil refining devices in China. The crude oil processing process is a continuous and highly automated industrial production process, and the first process of a crude oil atmospheric and vacuum distillation unit in an oil refinery provides raw materials for downstream secondary processing, so that the unit is very important for the smooth operation of the oil refinery.
HCl、H2The corrosion of S to steel is commonly existed in petroleum refining industry and is a very serious damage factor. In recent years, with the normalization of refining of high-sulfur and high-salt crude oil, a series of serious corrosion problems exist in the crude oil processing process, and especially, low-temperature corrosion (less than 120 ℃) of a condensation cooling system at the top of an atmospheric and vacuum distillation unit is most common. The device is forced to stop for rush repair or local stop for reducing the amount of the device due to pipeline leakage caused by corrosion, which brings huge economic loss to oil refining production and is very easy to cause disastrous results such as safety accidents, environmental pollution and the like. The corrosion inhibitor adding technology is the most common corrosion preventing method for oil refineries, is economic and effective, does not influence normal production, and can play a role in reducing the metal corrosion speed when a small amount of corrosion inhibitor is added. Oil-soluble imidazoline corrosion inhibitors have been widely used due to their excellent performance and no adverse effect on oil quality. But the oil is used as a solvent and must be used separately from the neutralizer, thereby not only reducing the safety, but also complicating the filling and using process. Therefore, it is a very meaningful work to develop and research a novel corrosion inhibitor which is more green, environment-friendly and efficient. The main component of the current neutralizing corrosion inhibitor in the market is water-soluble imidazoline which is quaternized on the basis of oil-soluble imidazoline or is modified by epoxidation to increase water solubility. However, both the two modifications are produced by two steps, the modification cost is high, the corrosion inhibition effect of the modified imidazoline is greatly reduced, and the water solubility of the quaternized modified product is unstable.
Disclosure of Invention
The invention aims to solve the problems of inconvenient filling and high cost of the corrosion inhibitor of the current oil refinery, and develops a neutralization corrosion inhibitor for the oil refinery, wherein the corrosion inhibitor comprises water-soluble imidazoline, and water-soluble groups such as amido and the like are introduced into an imidazoline structure, so that the water solubility of the imidazoline is improved. The imidazoline is produced by a one-pot method, so that the production steps are simplified, the use of hazardous ethylene oxide is avoided, the production cost is reduced, meanwhile, a sulfur atom is introduced into the molecular structure, the corrosion inhibition effect of the product is further improved, no three wastes are discharged in the production, and the cost is low. The water-soluble imidazoline prepared by the method has stable water solubility in use, and has obvious corrosion inhibition effect when used for preparing a neutralization corrosion inhibitor.
In order to achieve the purpose, the invention adopts the technical scheme that: the invention also discloses a neutralization corrosion inhibitor for refineries, which comprises water-soluble imidazoline.
Further, the neutralization corrosion inhibitor for the refining plant comprises the following components in parts by weight: 5-10 parts of water-soluble imidazoline, 10-15 parts of ethylenediamine, 10-15 parts of ethanolamine, 2-5 parts of thiourea and the balance of deionized water, wherein the total is 100 parts.
Furthermore, the addition amount of the water-soluble imidazoline is 10 parts, 15 parts of ethylenediamine, 10 parts of ethanolamine, 2 parts of thiourea and 63 parts of deionized water.
The invention also discloses a preparation method of the neutralization corrosion inhibitor for the refinery, which comprises the steps of firstly weighing the components according to the proportion, and uniformly mixing to prepare the neutralization corrosion inhibitor for the refinery.
Further, the water-soluble imidazoline is prepared by the following method: mixing the raw materials according to the proportion, firstly reacting for 2-4 hours at the temperature of 130-;
the raw materials and the molar ratio are as follows:
further, the raw materials and the molar ratio of the water-soluble imidazoline are as follows:
further, the 16-18 long-chain fatty acid is one or more of palmitic acid, stearic acid, oleic acid, linoleic acid and linolenic acid, and is preferably oleic acid.
Further, the ethylene amine is one or more of triethylene tetramine, tetraethylene pentamine, pentaethylene hexamine and hexaethylene heptamine, and is more preferably pentaethylene hexamine.
Further, the mercaptofatty acid is one or more of thioglycolic acid, mercaptopropionic acid and mercaptobutyric acid, and is more preferably thioglycolic acid.
Further, firstly carrying out amidation reaction at the temperature of 130-140 ℃ for 2-4 hours to generate an amide intermediate, and then heating to the temperature of 200-220 ℃ for reaction for 2-3 hours to carry out cyclization reaction to generate imidazoline. More preferably, the reaction is carried out at 130 ℃ for 3 hours and at 220 ℃ for 2 hours.
The invention also discloses water-soluble imidazoline which is prepared by the preparation method.
The typical molecular structure of the water-soluble imidazoline is shown as a formula I:
compared with the prior art, the neutralization corrosion inhibitor for refineries and the preparation method thereof have the following advantages:
1. aiming at the problems of inconvenient filling, high cost and the like of the current corrosion inhibitor for the oil refinery, the invention develops a novel water-soluble imidazoline, introduces water-soluble groups such as amido and the like into the imidazoline structure, and improves the water solubility of the imidazoline.
2. The invention adopts one-pot production, simplifies production steps, avoids the use of hazardous articles ethylene oxide, reduces production cost,
3. the invention introduces sulfur atoms into the molecular structure, further increases the corrosion inhibition effect of the product, has no three wastes discharge in the production and has low cost.
4. The water-soluble imidazoline prepared by the method has stable water solubility in use, and has obvious corrosion inhibition effect when used for preparing a neutralization corrosion inhibitor.
Drawings
FIG. 1 is an IR spectrum of the product of example 1.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment provides a neutralization corrosion inhibitor for refineries, which comprises the following raw materials in percentage by weight:
weighing 5-10 parts of water-soluble imidazoline, 10-15 parts of ethylenediamine, 10-15 parts of ethanolamine, 2-5 parts of thiourea and the balance of deionized water, wherein the total weight is 100 parts.
The water-soluble imidazoline is prepared by the following method:
weighing 1mol of oleic acid, adding 1.2mol of pentaethylenehexamine, adding 1mol of acetic acid, adding 1.5mol of thioglycolic acid, adding 0.5mol of dimethylbenzene, reacting at 130 ℃ for 4 hours, and heating to 220 ℃ for 2 hours to prepare the water-soluble imidazoline.
The typical molecular structure of the prepared water-soluble imidazoline is shown in the figure:
the infrared spectrum of the water-soluble imidazoline for the refinery prepared in the embodiment is shown in figure 1, and 1600cm can be seen from the figure-1Is positioned at 1700cm of imidazoline ring C ═ N vibration peak-1Is C ═ O vibration peak, 2800--1Is methyl and methylene stretching vibration peak, 3300cm-1Is a characteristic peak of C-N amide. The product structure is thus seen to correspond exactly to the ir spectrum.
The corrosion inhibitor finished product prepared by the embodiment is subjected to slow release rate evaluation according to the enterprise standard Q/SHCG 109-2017 of the China petrochemical group company, the corrosion medium is 1000mg/L hydrochloric acid solution, and a static hanging method is adopted, wherein the hanging material is an A20 steel test piece. The corrosion inhibition rates for different imidazoline concentrations are shown in the following table:
the water-soluble imidazoline corrosion inhibitor samples with different concentrations are prepared, the neutralizer is added, and the mixture is placed for 7 days, so that the product stability is good, and the phenomenon of turbidity and delamination is avoided.
Example 2
The embodiment discloses water-soluble imidazoline which is prepared by the following method:
1mol of linoleic acid is weighed, 1.2mol of hexaethyleneheptamine are added, 2mol of formic acid are added, 2mol of mercaptopropionic acid are added, 0.5mol of toluene is added, reaction is carried out at 130 ℃ for 4 hours, and then reaction is carried out at 200 ℃ for 3 hours.
The water-soluble imidazoline is adopted to prepare the neutralization corrosion inhibitor for the refining plant, and the concrete components and the mixture ratio are as follows: 10 parts of water-soluble imidazoline, 15 parts of ethylenediamine, 10 parts of ethanolamine, 2 parts of thiourea and the balance of deionized water, wherein the total amount is 100 parts, and the components are uniformly mixed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The neutralizing corrosion inhibitor for the refinery is characterized by comprising water-soluble imidazoline.
2. The neutralization corrosion inhibitor for refining plants according to claim 1, characterized by comprising the following components in parts by weight: 5-10 parts of water-soluble imidazoline, 10-15 parts of ethylenediamine, 10-15 parts of ethanolamine, 2-5 parts of thiourea and the balance of deionized water, wherein the total is 100 parts.
3. The neutralization corrosion inhibitor for refining plants according to claim 1 or 2, characterized in that the preparation method of water-soluble imidazoline is characterized by comprising the following steps: mixing the raw materials according to the proportion, firstly reacting for 2-4 hours at the temperature of 130-;
the raw materials and the molar ratio are as follows:
4. the neutralization corrosion inhibitor for refining plants according to claim 3, characterized in that the raw materials and the molar ratio are as follows:
5. the mill-used neutralization corrosion inhibitor according to claim 3, wherein the 16-18 long-chain fatty acid is a mixture of one or more of palmitic acid, stearic acid, oleic acid, linoleic acid and linolenic acid.
6. The mill neutralization corrosion inhibitor according to claim 3, wherein the ethyleneamine is one or more of triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine and hexaethyleneheptamine.
7. The mill neutralization corrosion inhibitor of claim 3, wherein the mercaptofatty acid is one or more of thioglycolic acid, mercaptopropionic acid, and mercaptobutyric acid.
8. The neutralization corrosion inhibitor for factories according to claim 3, which is characterized in that the reaction is carried out for 2-4 hours at 140 ℃ and then the temperature is raised to 200 ℃ and 220 ℃ for 2-3 hours.
9. A preparation method of a neutralization corrosion inhibitor for a refinery is characterized by comprising the following steps of weighing the components according to a ratio, and uniformly mixing to prepare the neutralization corrosion inhibitor for the refinery.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116397232A (en) * | 2023-04-19 | 2023-07-07 | 江苏太湖新材料控股有限公司 | Water-soluble corrosion inhibitor and synthesis method thereof |
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| CN116397232B (en) * | 2023-04-19 | 2023-10-27 | 江苏太湖新材料控股有限公司 | Water-soluble corrosion inhibitor and synthesis method thereof |
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