CN112300131B - Imidazoline corrosion inhibitor with asymmetric terminal group and preparation method and application thereof - Google Patents
Imidazoline corrosion inhibitor with asymmetric terminal group and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
- C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
- C07D403/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
- C07D405/04—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
- C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
- C07D409/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
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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
- C23F11/14—Nitrogen-containing compounds
- C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom
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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
- C23F11/165—Heterocyclic compounds containing sulfur as hetero atom
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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
- 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
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/068—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors compounds containing a C=C bond
Abstract
The invention belongs to the field of corrosion and protection of metal materials, and particularly relates to an imidazoline corrosion inhibitor with an asymmetric end group, and a preparation method and application thereof. The asymmetric end-group imidazoline corrosion inhibitor has the following structure:
wherein Y is O, S, N, R1 is long-chain alkyl, the carbon number of the carbon chain is 12-17, and R2 is H or- (CH)2)m‑CH3And m is an integer of not less than 0. The corrosion inhibitor provided by the invention utilizes the intramolecular synergistic adsorption and blocking effect to synthesize an imidazoline ring from organic heterocyclic carboxylic acid and polyamine, and then utilizes the condensation and end capping of the terminal amino group of the side chain of the long-chain carboxylic acid and the imidazoline ring to obtain the imidazoline corrosion inhibitor with asymmetric terminal groups, and has very strong corrosion inhibition performance at high temperature.
Description
Technical Field
The invention belongs to the field of corrosion and protection of metal materials, and particularly relates to an imidazoline corrosion inhibitor with an asymmetric end group, and a preparation method and application thereof.
Background
Due to the increase of the oil well exploitation depth of oil and gas fields in China and the popularization of various thermal recovery processes, the underground temperature of oil and gas gradually rises, and CO is associated with a plurality of oil and gas2Gas, CO2Dissolving in water can cause severe corrosion to metal equipment in the well, and a corrosion inhibitor is usually added to retard the corrosion of the equipment. Imidazoline corrosion inhibitors have received extensive attention due to their low toxicity and excellent corrosion inhibiting propertiesHowever, with the harsher exploitation environment of oil and gas fields, the corrosion inhibition performance of the long-chain alkyl imidazoline corrosion inhibitor widely used in the market at present is greatly reduced at high temperature and even directly loses efficacy.
Guo silver and so on disclose the change of the corrosion inhibition performance of the oleic acid imidazoline corrosion inhibitor in the temperature range of 40-100 ℃ in the research on the synthesis and reaction performance of the oleic acid imidazoline corrosion inhibitor, and the results show that the corrosion inhibition performance is obviously reduced along with the rise of the temperature, and the corrosion inhibition rate is reduced to 63.01 percent when the temperature is raised to 100 ℃. The evaluation of corrosion inhibition performance of an oleic acid imidazoline corrosion inhibitor on a 20-steel viscosity-reducing top water medium is disclosed by everbright soldiers, king as people, Weizada and the like, the change of the corrosion inhibition performance of a quinoline corrosion inhibitor in the viscosity-reducing top water medium at the temperature of 40-100 ℃ is researched, the corrosion inhibition rate reaches 83.2% at the temperature of 40 ℃, and the corrosion inhibition rate is reduced to 73.2% when the temperature is increased to 100 ℃. Therefore, high temperature has become the most important factor limiting the performance of imidazoline corrosion inhibitors.
CN104233310B discloses a compound imidazoline quaternary ammonium salt corrosion inhibitor and a preparation method thereof, wherein the compound imidazoline quaternary ammonium salt corrosion inhibitor comprises the following components in percentage by mass: 30 to 35 weight percent of alkyl acid imidazoline quaternary ammonium salt, 8 to 10 weight percent of nitrogen-containing organic multi-element phosphate, 1 to 2 weight percent of amphoteric surfactant, 0.5 to 1 weight percent of dispersant, 1 to 2 weight percent of cosolvent and the balance of water. The technical proposal is that the corrosion inhibitor is added with 50ppm of chemical dosage under self-prepared simulated water at 50 ℃, the corrosion inhibition rate is more than 70 percent, but the corrosion inhibition component is difficult to play a role at high temperature.
CN109868478A discloses a corrosion inhibitor and a preparation method thereof, comprising 2 to 20 weight parts of imidazoline quaternary ammonium salt, 0.2 to 2 weight parts of inorganic halide salt and 6 to 14 weight parts of chitosan derivative; the chitosan derivative is glycidyl triethyl ammonium chloride modified chitosan or glycidyl tripropyl ammonium chloride modified chitosan. According to the technical scheme, the corrosion inhibitor still has a good corrosion inhibition effect at the temperature of 130-160 ℃ by matching the chitosan derivative which is glycidyl triethyl ammonium chloride or glycidyl tripropyl ammonium chloride modified chitosan with the imidazoline quaternary ammonium salt, but the corrosion inhibition capability has an improvement space.
In conclusion, the prior art still lacks an imidazoline corrosion inhibitor which can be used in the high-temperature environment of the oil field and has high corrosion inhibition.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides an imidazoline corrosion inhibitor with asymmetric end groups, wherein an imidazoline ring is synthesized from organic heterocyclic carboxylic acid and polyamine by utilizing the intramolecular synergistic adsorption and blocking effect, and then the imidazoline corrosion inhibitor with the asymmetric end groups is obtained by utilizing the condensation and blocking of the long-chain carboxylic acid and the terminal amino group of the side chain of the imidazoline ring. The detailed technical scheme of the invention is as follows.
To achieve the above objects, according to one aspect of the present invention, there is provided an imidazoline corrosion inhibitor having an asymmetric terminal group, which has the following structure:
wherein Y is O, S, N, R1 is long-chain alkyl, carbon number of carbon chain is 12-17, and R2 is H or- (CH)2)m-CH3And m is an integer of not less than 0.
Preferably, m has one of 0, 1, 2 and 3.
According to another aspect of the invention, a preparation method of the imidazoline corrosion inhibitor is provided, and comprises the following steps:
(1) reacting heterocyclic carboxylic acid with organic polyamine to obtain imidazoline;
(2) imidazoline reacts with long-chain alkyl carboxylic acid to obtain the imidazoline corrosion inhibitor with the asymmetric end group.
Preferably, the molar ratio of the heterocyclic carboxylic acid to the organic polyamine is 1 (1.05-1.1). If the organic amine is excessive, the imidazoline yield is higher, and if the organic amine is excessive, the reaction is insufficient, and an intermediate product amide is generated.
Preferably, the heterocyclic carboxylic acid is one or more of furoic acid, thiophenecarboxylic acid and pyrrolecarboxylic acid.
Preferably, the organic polyamine is tetraethylenepentamine or diethylenetriamine.
Preferably, the long-chain alkyl carboxylic acid is one or more of lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid.
According to another aspect of the invention, there is provided the use of imidazoline corrosion inhibitors, including as corrosion inhibitors for oil fields or as protectants for metal equipment in acid pickling environments.
Preferably, the service temperature of the oil field corrosion inhibitor is 80-150 ℃, and preferably 80-120 ℃.
The invention has the following beneficial effects:
(1) an imidazoline corrosion inhibitor with asymmetric end groups is prepared through synthesizing imidazoline ring from organic heterocyclic carboxylic acid and polyamine, and condensation blocking of long-chain carboxylic acid and the end amino group of side chain of imidazoline ring to obtain imidazoline corrosion inhibitor with asymmetric end groups.
(2) The synthetic process is simple, the corrosion inhibition effect is good, the corrosion inhibitor is suitable for corrosion protection of N80 low-carbon steel, the corrosion inhibition performance is still excellent under the condition of high temperature of 80 ℃, and CO at high temperature can be effectively prevented2The corrosion inhibition rate of medium carbon steel in the environment is basically kept above 90%, and the corrosion inhibition performance is reduced at 120 ℃, but still kept above 80%.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
(1) Adding solid 2-furancarboxylic acid and tetraethylenepentamine into a three-neck flask, adding a xylene carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate out, adding zeolite, amidating at 120 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction ratio of the 2-furancarboxylic acid to the tetraethylenepentamine is 1: 1.05;
(2) cooling the reaction system to 120 ℃, adding oleic acid with equal proportion, continuing to react for two hours, and removing water and xylene by rotary evaporation after the reaction is finished.
Example 2
(1) Adding solid 2-thiophenecarboxylic acid and tetraethylenepentamine into a three-neck flask, adding a xylene water carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate out, adding zeolite, carrying out amidation at 120 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction ratio of the 2-furancarboxylic acid to the tetraethylenepentamine is 1: 1.05;
(2) cooling the reaction system to 120 ℃, adding equivalent oleic acid for reaction for two hours, and removing water and xylene in the system by rotary evaporation after the reaction is finished.
Example 3
(1) Adding 2-pyrrole carboxylic acid and tetraethylenepentamine into a three-neck flask, adding a xylene carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate out, adding zeolite, amidating at 120 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction ratio of the 2-pyrrole carboxylic acid to the tetraethylenepentamine is 1: 1.05;
(2) cooling the reaction system to 120 ℃, adding the same amount of oleic acid, continuing to react for 2 hours, and cooling and rotary evaporating to remove water and xylene after the reaction is finished.
Example 4
(1) Adding solid 2-furancarboxylic acid and tetraethylenepentamine into a three-neck flask, adding a xylene carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate out, adding zeolite, amidating at 120 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction ratio of the 2-furancarboxylic acid to the tetraethylenepentamine is 1: 1.05;
(2) cooling the reaction system to 120 ℃, adding equivalent oleic acid, continuing to react for 2 hours, and then performing rotary evaporation to remove water and xylene to obtain the corrosion inhibitor.
Example 5
(1) Adding solid 2-thiophenecarboxylic acid and tetraethylenepentamine into a three-neck flask, adding a xylene water carrying agent and water generated by a reaction system to form an azeotrope, carrying water to evaporate, adding zeolite, amidating at 120 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction molar ratio of the 2-furancarboxylic acid to the tetraethylenepentamine is 1: 1.05;
(2) and cooling the reaction system to 120 ℃, adding stearic acid for reaction for two hours, and removing water and xylene by rotary evaporation after the reaction is finished to obtain the corrosion inhibitor.
Example 6
(1) Adding solid 2-furancarboxylic acid and tetraethylenepentamine into a three-neck flask, adding a xylene carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate out, adding zeolite, amidating at 140 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction molar ratio of the 2-furancarboxylic acid to the tetraethylenepentamine is 1: 1.1;
(2) cooling the reaction system to 120 ℃, adding lauric acid to continue reacting for two hours, and removing water and xylene by rotary evaporation to obtain the corrosion inhibitor.
Example 7
(1) Adding solid 3- (2-furan) propionic acid and tetraethylenepentamine into a three-neck flask, adding a xylene water carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate, adding zeolite, amidating at 140 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction molar ratio of the 3- (2-furan) propionic acid to the tetraethylenepentamine is 1: 1.1;
(2) cooling the reaction system to 120 ℃, adding oleic acid to continue reacting for two hours, and removing water and xylene by rotary evaporation to obtain the corrosion inhibitor.
Example 8
(1) Adding solid 2-furancarboxylic acid and diethylenetriamine into a three-neck flask, adding a xylene water carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate, adding zeolite, amidating at 140 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction molar ratio of the 2-furancarboxylic acid to the diethylenetriamine is 1: 1.05;
(2) cooling the reaction system to 120 ℃, adding oleic acid to continue reacting for two hours, and removing water and xylene by rotary evaporation to obtain the corrosion inhibitor.
Comparative examples
Comparative example 1
(1) Adding newly prepared solid 2-furancarboxylic acid and tetraethylenepentamine into a three-neck flask, adding a xylene carrying agent and water generated by a reaction system to form an azeotrope, carrying the water to evaporate, adding zeolite, amidating at 140 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction molar ratio of the 2-furancarboxylic acid to the tetraethylenepentamine is 1: 1.1;
(2) and cooling the reaction system, and removing water and xylene by rotary evaporation to obtain the corrosion inhibitor.
Comparative example 2
(1) Adding solid lauric acid and tetraethylenepentamine into a three-neck flask, adding a xylene carrying agent and water generated by a reaction system to form an azeotrope, carrying water to evaporate, adding zeolite, amidating at 140 ℃ for 3 hours, further heating to 220 ℃, dehydrating and cyclizing for 2 hours, wherein the reaction molar ratio of 2-furancarboxylic acid to tetraethylenepentamine is 1: 1.1;
(2) and cooling the reaction system to 120 ℃, adding 2-furancarboxylic acid, continuing to react for two hours, and removing water and xylene by rotary evaporation to obtain the corrosion inhibitor.
Test examples
The invention adopts a weight loss method to evaluate the performance of the corrosion inhibitor molecules.
Experimental medium: 1MPa CO23% of NaCl and a corrosion inhibitor mixing system with different concentrations is added. Experiment temperature: 80 ℃ and 120 ℃ test materials: n80 low carbon steel, autoclave evaluation mode: and weighing the mass of the hanging pieces before and after corrosion, and then calculating the corrosion rate to obtain the corrosion inhibition rate after the corrosion inhibitor is added.
The corrosion rate calculation method is as follows: where Δ m is the mass loss before and after etching, and the unit g, S is the area of the coupon, and the unit cm is2And t is the experimental time in h.
The corrosion inhibition rate is calculated by the formula that eta is (V)0-Vinh)/V0In the formula V0For the corrosion rate of the blank without adding the corrosion inhibitor, Vinh is the corrosion rate of the blank with the corrosion inhibitor added, and the unit is millimeter per year (mm/a).
The weight loss method comprises the following specific operation steps:
cleaning the inside of the autoclave, adding a corresponding amount of corrosion inhibitor into the prepared 3% NaCl solution, suspending and immersing the cleaned metal hanging piece in the corrosion solution, and introducing CO2Removing oxygen in the autoclave by gas for half an hour, heating the autoclave to the temperature required by the experiment, and introducing 1Mpa CO2And (3) corroding the hanging piece for 24 hours by using gas, taking out the hanging piece, washing the hanging piece by using water, alcohol and acetone in sequence, and drying the hanging piece by using cold air. The mass was weighed and the corrosion rate and corrosion inhibition rate were calculated to obtain a test result table, as shown in table 1.
Table 1 table of weight loss test results
The structural formula and corrosion inhibition rate of the corrosion inhibitor are collated, as shown in Table 2.
TABLE 2 structural formula and corrosion inhibition rate corresponding table
Comparative example 1 and comparative example 2 do not have the molecular configuration of the present invention, wherein comparative example 1 does not have R1, and comparative example 2 has a functional group, but the position of the functional group is different and the molecular configuration is different. As can be seen from Table 1, the corrosion inhibitors obtained in examples 1 to 8 of the present invention have slightly different corrosion inhibition effects under different experimental conditions, but the overall corrosion inhibition efficiency is maintained at a higher level, and the corrosion inhibitors are excellent in performance. But also has good corrosion inhibition performance under the severe condition of high temperature of 120 ℃. In addition, the 2-furancarboxylic acid in the synthetic raw materials is a biomass platform molecule, belongs to renewable resources, and the preparation of the corrosion inhibitor molecule by using the biomass platform molecule has certain practical significance.
Further analysis of examples 1-8 shows that examples 1-3 examine the influence of three different side-chain heterocyclic molecules on the corrosion inhibition performance of the corrosion inhibitor molecule, and N, O, S all achieve better effects. From the comparison between examples 1 and 4 and between examples 2 and 5, it can be seen that long chain alkyl groups with different carbon chain lengths have different effects on the corrosion inhibition performance of the corrosion inhibitor molecules. It can be seen from examples 6 and 4 that the corrosion inhibitors have the same molecular configuration, different molar ratios of heterocyclic carboxylic acid to organic polyamine, and different corrosion inhibiting abilities. As can be seen from comparison of example 7 with example 1, the corrosion inhibitors have different corrosion inhibition abilities depending on the value of m, and the corrosion inhibition abilities are higher when the value of m is one of 0, 1, 2 and 3 according to the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The imidazoline corrosion inhibitor with the asymmetric end group is characterized by comprising one of a formula (I), a formula (II), a formula (III), a formula (IV), a formula (V), a formula (VI), a formula (VII) and a formula (eight), wherein the structures of the formula (I), the formula (II), the formula (III), the formula (IV), the formula (V), the formula (VI), the formula (VII) and the formula (eight) are as follows:
2. the method for preparing the imidazoline corrosion inhibitor of claim 1, comprising the steps of:
(1) reacting heterocyclic carboxylic acid with organic polyamine to obtain imidazoline;
(2) imidazoline reacts with long-chain alkyl carboxylic acid to obtain the imidazoline corrosion inhibitor with the asymmetric end group;
the heterocyclic carboxylic acid is one or more of furoic acid, thiophenecarboxylic acid and pyrrolecarboxylic acid;
the organic polyamine is tetraethylenepentamine;
the long-chain alkyl carboxylic acid is one or more of lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid.
3. The method for preparing imidazoline corrosion inhibitor according to claim 2, wherein the molar ratio of heterocyclic carboxylic acid to organic polyamine is 1 (1.05-1.1).
4. The use of the imidazoline corrosion inhibitor of claim 1, comprising as a corrosion inhibitor for metal equipment in oil field corrosion inhibitors or acid pickling environments.
5. The use of the imidazoline corrosion inhibitor of claim 4, wherein the service temperature of the oilfield corrosion inhibitor is 80-150 ℃.
6. The use of the imidazoline corrosion inhibitor of claim 4, wherein the service temperature of the oilfield corrosion inhibitor is 80-120 ℃.
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