CN108440415B - Oil-soluble bis-imidazoline derivative corrosion inhibitor and preparation method and application thereof - Google Patents
Oil-soluble bis-imidazoline derivative corrosion inhibitor and preparation method and application thereof Download PDFInfo
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- CN108440415B CN108440415B CN201810471935.6A CN201810471935A CN108440415B CN 108440415 B CN108440415 B CN 108440415B CN 201810471935 A CN201810471935 A CN 201810471935A CN 108440415 B CN108440415 B CN 108440415B
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
- C07D233/04—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
- C07D233/20—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with substituted hydrocarbon radicals, directly attached to ring carbon atoms
- C07D233/24—Radicals substituted by nitrogen atoms not forming part of a nitro radical
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- 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
- C23F11/16—Sulfur-containing compounds
Abstract
An oil-soluble bis-imidazoline derivative corrosion inhibitor has a structural general formula as follows:
Description
Technical Field
The invention belongs to the technical field of corrosion inhibitor organic compounds of oil and gas fields, and particularly relates to an oil-soluble bis-imidazoline derivative corrosion inhibitor, and a preparation method and application thereof.
Background
Acid gas CO during oil and gas field production2、H2S and water are produced along with the natural gas. Dried H2S、CO2The gas is generally not corrosive, but when dissolved in water, it promotes different forms of electrochemical corrosion damage to the steel. H present in oil and gas as associated gas2S、CO2Gas often enters the gathering and transportation system through the exploitation, transportation and other modes of oil and gas. At present, oil and gas pipelines and other equipment adopted by oil and gas fields at home and abroad are mostly made of steel, and the materials are used for H2S、CO2Resistance to corrosion is generally poor, and therefore, corrosion problems exist in various links of oil and gas production transportation. The corrosion of oil and gas exploitation, storage and transportation equipment not only can influence the production and bring economic loss, but also seriously threatens the safety of an oil and gas field.
In recent years, with the development of deep-seated hydrocarbon reservoirs, H2S、CO2Corrosion oil and gas field drill collectionThe problems caused by the transmission system are more and more serious, and the corrosion protection is the research hotspot of the petroleum and natural gas industry. Practice shows that in H2S、CO2In corrosion protection, when corrosion inhibitor protection is adopted, all metal bodies in the whole system contacting with the medium can be protected, and the corrosion inhibitor has low one-time investment cost and simple protection process. Therefore, the corrosion inhibitor plays an important role in the petroleum and petrochemical field and is widely applied to various fields of the petroleum and natural gas industry. At present, most of corrosion inhibitors used at home and abroad are adsorption type corrosion inhibitors, and the main corrosion inhibition components are organic matters, such as propiolic alcohol, organic amine, imidazoline, quaternary ammonium salt and the like. Imidazolines are widely used due to their low toxicity.
Disclosure of Invention
In order to overcome the defects in the background art, the invention aims to provide an oil-soluble bis-imidazoline derivative corrosion inhibitor for oil-gas field gathering and transportation pipelines.
The invention also aims to provide a preparation method of the oil-soluble bis-imidazoline derivative corrosion inhibitor.
The third purpose of the invention is to provide the application of the thiourea-modified imidazoline as the preservative for oil-gas field gathering and transportation pipeline equipment.
In order to realize the purpose, the invention adopts the following technical scheme: an oil-soluble bis-imidazoline derivative corrosion inhibitor has a structural general formula as follows:
A preparation method of an oil-soluble bis-imidazoline derivative corrosion inhibitor comprises the following preparation steps: s1, reacting the carboxymethyl cysteine with diethylenetriamine to obtain a bis-imidazoline intermediate, wherein the chemical reaction formula is as follows:
s2, reacting the diimidazoline intermediate prepared in S1 with organic acid to obtain the oil-soluble diimidazoline derivativeThe biological corrosion inhibitor has the chemical reaction formula as follows:
In order to further improve the technical scheme, the specific operation steps of the S1 provided by the invention are as follows: mixing carboxymethyl cysteine and diethylenetriamine according to a mass ratio of 1: 2-1: 2.5 adding the mixture into a container, and under the condition of the existence of a water-carrying agent xylene, adopting a gradual heating method to carry out an amide reaction firstly and then carry out a cyclization reaction to obtain an imidazoline intermediate.
In order to further improve the technical scheme, organic acid is added into the bis-imidazoline intermediate prepared in the step S1, and the mixture is stirred and reacts for 1-3 hours in the presence of a condensing agent N, N' -dicyclohexylcarbodiimide to obtain the oil-soluble bis-imidazoline derivative corrosion inhibitor.
In order to further improve the technical scheme, the step-by-step temperature rise process in the step S1 is to raise the temperature to 210-220 ℃ under the condition of continuous stirring, and the temperature rise reaction is carried out for 4 hours, so as to obtain a bis-imidazoline intermediate; and (S2) cooling the imidazoline intermediate to room temperature, adding an organic acid, adding a small amount of a condensing agent N, N' -dicyclohexylcarbodiimide, stirring to react for 3 hours after the addition is finished, and cooling to obtain the bis-imidazoline derivative.
In order to further improve the technical scheme, the quaternizing agent in the step S2 is benzyl chloride, and the ratio of carboxymethyl cysteine: diethylenetriamine: the mass ratio of the organic acid is 1: 2: 2.
in order to further improve the technical scheme, the organic acid is an organic acid with a carbon chain length of 8-20 carbon atoms.
In order to further improve the technical scheme, the organic acid is one of ricinoleic acid, linoleic acid, isooctanoic acid or oleic acid.
An oil-soluble bis-imidazoline derivative corrosion inhibitor is prepared through diluting it with diesel oil, toluene, xylene or other solvent oil with flash point greater than 80 deg.C, and using it as corrosion inhibitor for oil-gas field gathering and transportation pipeline.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: compared with the existing corrosion inhibitor for oil and gas fields, the oil-soluble bis-imidazoline derivative prepared by the invention has the advantages that cysteine is introduced, the oil-soluble bis-imidazoline derivative can be adsorbed on the metal surface in a multi-center manner, the fluidity is better, the corrosion inhibition effect of the corrosion inhibitor is enhanced, and the current situation of serious water pollution caused by the existing water-soluble imidazoline corrosion inhibitor is solved. Compared with the traditional oil-soluble corrosion inhibitor, the oil-soluble bis-imidazoline derivative belongs to an environment-friendly green corrosion inhibitor, and has a good corrosion inhibition effect through tests.
The bis-imidazoline derivative corrosion inhibitor has good oil solubility.
In the invention, the diluent of the corrosion inhibitor is diesel oil, toluene, xylene or other solvent oil with the flash point of more than 80 ℃.
In the present invention, when the carboxymethyl cysteine: diethylenetriamine: organic acid 1: 2: the yield was highest at 2.
In the invention, the reaction efficiency is higher when the highest temperature of the cyclization reaction is 210 ℃.
In the corrosion inhibitor provided by the invention, the bisimidazoline derivative mainly comprises two five-membered heterocycles containing C ═ N double bonds, cysteine and oleic acid. When the corrosion inhibitor molecule is adsorbed on the metal interface, the imidazoline ring on the molecule is preferentially adsorbed to form a hydrophobic film to block H in the solution2O，H+，HCO3 -，HS-Etc. migrate toward the metal surface. The introduced cysteine contains hetero atoms in molecules, can be adsorbed on the iron surface to inhibit corrosion, and the adsorption of the amino acid and the metallic iron is accompanied with chemical reaction, so that the formed complex is relatively stable. The acid introduction of the long-chain organic acid enhances the oil solubility of the corrosion inhibitor. When in use, the bisimidazoline derivative is compounded with thiourea, alkynol corrosion inhibitors (such as acetylene alcohol), benzotriazole and the like, so that the bisimidazoline derivative has better fluidity and can contact with metalMulti-center chemical adsorption is generated, thereby improving the corrosion inhibition effect.
Detailed Description
The present invention will be explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.
Example one
The embodiment provides a preparation method of an oil-soluble bis-imidazoline derivative corrosion inhibitor. The oil-soluble bisimidazoline derivative is obtained by reacting carboxymethyl cysteine with diethylenetriamine to obtain a bisimidazoline intermediate, and then reacting with an organic acid.
This example provides the specific synthetic steps of the modified imidazoline, which include the following steps:
carboxymethyl cysteine and diethylenetriamine
Putting the mixture into a reactor according to the molar ratio, gradually heating to 210 ℃ under the condition of continuous stirring in the presence of a water-carrying agent xylene, and heating for 4 hours to obtain a bis-imidazoline intermediate; cooling to room temperature and then mixing according to the mol ratio
Oleic acid and a small amount of condensing agent DCC are added, stirring reaction is carried out for 3h after the addition is finished, and the bis-imidazoline derivative 1 is obtained after cooling, and has good solubility in toluene, xylene and diesel oil through tests.
Example two
The embodiment provides a preparation method of an oil-soluble bis-imidazoline derivative corrosion inhibitor. The oil-soluble bisimidazoline derivative is obtained by reacting carboxymethyl cysteine with diethylenetriamine to obtain a bisimidazoline intermediate, and then reacting with an organic acid.
This example provides the specific synthetic steps of the modified imidazoline, which include the following steps:
carboxymethyl cysteine and diethylenetriamine
Putting the mixture into a reactor according to the molar ratio, gradually heating to 210 ℃ under the condition of continuous stirring in the presence of a water-carrying agent xylene, and heating for 4 hours to obtain a bis-imidazoline intermediate; cooling to room temperature and then mixing according to the mol ratio
Adding linoleic acid and a small amount of condensing agent DCC, stirring to react for 2h after the addition is finished, and cooling to obtain the oil-soluble bisimidazoline derivative 2 which has good solubility in toluene, xylene and diesel oil through tests.
EXAMPLE III
The embodiment provides a preparation method of an oil-soluble bis-imidazoline derivative corrosion inhibitor. The oil-soluble bisimidazoline derivative is obtained by reacting carboxymethyl cysteine with diethylenetriamine to obtain a bisimidazoline intermediate, and then reacting with an organic acid.
This example provides the specific synthetic steps of the modified imidazoline, which include the following steps:
carboxymethyl cysteine and diethylenetriamine
Putting the mixture into a reactor according to the molar ratio, gradually heating to 210 ℃ under the condition of continuous stirring in the presence of a water-carrying agent xylene, and heating for 4 hours to obtain a bis-imidazoline intermediate; cooling to room temperature and then mixing according to the mol ratio
Adding ricinoleic acid and a small amount of condensing agent DCC, stirring to react for 2.5h after the addition is finished, and cooling to obtain the oil-soluble bis-imidazoline derivative 3 which has good solubility in toluene, xylene and diesel oil through tests.
Example four
The embodiment provides a preparation method of an oil-soluble bis-imidazoline derivative corrosion inhibitor. The oil-soluble bisimidazoline derivative is obtained by reacting carboxymethyl cysteine with diethylenetriamine to obtain a bisimidazoline intermediate, and then reacting with an organic acid.
This example provides the specific synthetic steps of the modified imidazoline, which include the following steps:
carboxymethyl cysteine and diethylenetriamine
Putting the mixture into a reactor according to the molar ratio, gradually heating to 210 ℃ under the condition of continuous stirring in the presence of a water-carrying agent xylene, and heating for 4 hours to obtain a bis-imidazoline intermediate; cooling to room temperature and then mixing according to the mol ratio
Adding isooctanoic acid and a small amount of condensing agent DCC, stirring and reacting for 3h after the addition is finished, and cooling to obtain the oil-soluble bis-imidazoline derivative 4 which has good solubility in toluene, xylene and diesel oil through tests.
The oil-soluble bis-imidazoline derivatives 1, 2, 3 and 4 obtained in the first, second, third and fourth embodiments are respectively diluted into 30% solution by diesel oil, and the fluidity of the corrosion inhibitor is increased by dilution, the condensation point of the corrosion inhibitor is reduced, and the corrosion inhibitor can be used at a lower temperature.
By compounding diluent of 1, 2, 3 and 4 oil-soluble bis-imidazoline derivative corrosion inhibitors with thiourea, acetylene alcohol and benzotriazole, the optimal compounding proportion and corrosion inhibition efficiency are shown in the following table 1:
table 1 shows the corrosion rates and corrosion rates of the dilutions of the corrosion inhibitors of the oil-soluble bis-imidazoline derivatives of the examples one to four
In conclusion, the bis-imidazoline derivative is an excellent corrosion inhibitor and can be compounded with thiourea, acetylene alcohol, benzotriazole and the like for use. Convenient preparation and implementation and high corrosion inhibition efficiency. The invention can be used for corrosion prevention of gathering and transportation pipelines of oil and gas fields.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention to other embodiments, and any person skilled in the art may use the above technical contents to exemplify the embodiments, but any simple modifications, equivalent changes, etc. made to the above embodiments according to the technical spirit of the present invention, which do not depart from the technical contents of the present invention, still belong to the protection scope of the technical solution of the present invention.
The present invention is not described in detail in the prior art.
Claims (7)
1. An oil-soluble bis-imidazoline derivative corrosion inhibitor is characterized in that: the general structural formula is as follows:
2. A method for preparing the oil-soluble bis-imidazoline derivative corrosion inhibitor of claim 1, which is characterized by comprising the following steps: the preparation method comprises the following steps: s1, reacting the carboxymethyl cysteine with diethylenetriamine to obtain a bis-imidazoline intermediate, wherein the chemical reaction formula is as follows:
s2, reacting the bis-imidazoline intermediate prepared in the S1 with organic acid to obtain the oil-soluble bis-imidazoline derivative corrosion inhibitor, wherein the chemical reaction formula is as follows:
wherein R represents a linear or branched alkyl or alkenyl group having 8 to 20 carbon atoms.
3. The method for preparing the oil-soluble bis-imidazoline derivative corrosion inhibitor of claim 2, wherein the method comprises the following steps: the specific operation steps of S1 are as follows: mixing carboxymethyl cysteine and diethylenetriamine according to a mass ratio of 1: 2-1: 2.5 adding the mixture into a container, and under the condition of the existence of a water-carrying agent xylene, adopting a gradual heating method to carry out an amide reaction firstly and then carry out a cyclization reaction to obtain an imidazoline intermediate.
4. The method for preparing the oil-soluble bis-imidazoline derivative corrosion inhibitor of claim 2, wherein the method comprises the following steps: and (3) adding an organic acid into the bis-imidazoline intermediate prepared in the S1, and stirring and reacting for 1-3 hours in the presence of a condensing agent N, N' -dicyclohexylcarbodiimide to obtain the oil-soluble bis-imidazoline derivative corrosion inhibitor.
5. The method for preparing the oil-soluble bis-imidazoline derivative corrosion inhibitor of claim 3, wherein the method comprises the following steps: the step-by-step heating process in the step S1 is to heat to 210-220 ℃ under the condition of continuous stirring, and carry out heating reaction for 4 hours to obtain a bis-imidazoline intermediate; the reaction process of the reaction of the bisimidazoline intermediate and the organic acid in the step S2 is as follows: and (3) cooling the bis-imidazoline intermediate prepared in the step (S1) to room temperature, adding an organic acid, adding a small amount of a condensing agent N, N' -dicyclohexylcarbodiimide, stirring to react for 3 hours after the addition is finished, and cooling to obtain the bis-imidazoline derivative.
6. The method for preparing the oil-soluble bis-imidazoline derivative corrosion inhibitor of claim 2, wherein the method comprises the following steps: the carboxymethyl cysteine: diethylenetriamine: the mass ratio of the organic acid is 1: 2: 2.
7. use of the oil-soluble bis-imidazoline derivative corrosion inhibitor of claim 1 as a corrosion inhibitor for oil and gas field gathering and transportation pipeline equipment after dilution with diesel oil, toluene, xylene or other solvent oil with a flash point >80 ℃.
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| CN110158091A (en) * | 2019-06-28 | 2019-08-23 | 湖南浩润科技有限公司 | A kind of new oil-soluble corrosion inhibiter |
| CN114685372A (en) * | 2020-12-25 | 2022-07-01 | 中国石油化工股份有限公司 | Oil-soluble efficient imidazoline corrosion inhibitor with multiple adsorption sites and preparation method thereof |
| CN116589999A (en) * | 2023-05-17 | 2023-08-15 | 广汉市华星新技术开发研究所（普通合伙） | Composite retarded acid and preparation method thereof |
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