CN116892024A - Preparation method of vapor phase corrosion inhibitor - Google Patents
Preparation method of vapor phase corrosion inhibitor Download PDFInfo
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- CN116892024A CN116892024A CN202310978727.6A CN202310978727A CN116892024A CN 116892024 A CN116892024 A CN 116892024A CN 202310978727 A CN202310978727 A CN 202310978727A CN 116892024 A CN116892024 A CN 116892024A
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
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- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 description 1
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- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical class C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 1
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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
- C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase 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)
Abstract
The invention discloses a preparation method of a vapor phase corrosion inhibitor, which comprises the following steps: adding aldehyde and amine in proportion into a reaction vessel provided with a stirring and reflux device; adding a catalyst and absolute ethyl alcohol serving as a solvent into a reaction container, and reacting for a preset time at normal temperature; after the normal temperature reaction is finished, dropwise adding ketone into a reaction container, heating, and continuing to reflux for a preset time to obtain a corrosion inhibitor main agent; compounding the required monomers into the main inhibitor in proportion to obtain the gas-phase inhibitor; the vapor phase corrosion inhibitor contains a large amount of Mannich base compounds which are used as high-pressure resistant, high-temperature resistant and high-CO-content compounds 2 Special gas-phase corrosion inhibitor for CCS-EOR of environment. The preparation method of the invention adopts low price, is easy to obtain, has simple synthesis method, short synthesis time, is suitable for mass production, and is suitable for high pressure, high temperature and high CO 2 The L415 steel material under the working condition has obvious corrosion inhibition effect, and has great significance for promoting the popularization and development of CCS-EOR.
Description
Technical Field
The invention belongs to the technical field of metal corrosion inhibitors, relates to a preparation method of a vapor phase corrosion inhibitor, and in particular relates to a high-pressure-resistant metal corrosion inhibitorHigh temperature and high CO content 2 A preparation method of a special gas-phase corrosion inhibitor for environmental CCS-EOR (carbon oxide trapping, burying and recovery improvement technology).
Background
At present, the method is used for coping with CO 2 Emissions have led to global warming, reduced carbon emissions, and achieving carbon neutralization has achieved global consensus. CO 2 Trapping, utilizing and burying (abbreviated as CCUS) CO 2 CO is realized while being captured and separated from industrial emission source for utilization 2 An industrial process for reducing emissions. CO 2 As an excellent oil displacement medium, the method is a precious resource for oil reservoir development and utilization, and CO is utilized 2 The oil displacement is combined with the CCUS to realize CO 2 The resource utilization has the win-win characteristic of social benefit and economic benefit, and the universal acceptance of the international society is obtained.
Carbon dioxide capturing, burying and enhanced oil recovery (CCS-EOR) is one of the representative innovation results of China petroleum, and researches show that CO 2 The injection capacity is 2-6 times of the water injection capacity, the energy of an oil reservoir can be effectively supplemented, a displacement pressure system is established and maintained, and the recovery ratio can be greatly improved through viscosity reduction, expansion, phase mixing and other oil displacement mechanisms. Through the attack and test of the last 20 years, an integrated full-industrial chain technology system of carbon capture, carbon transportation, carbon utilization and carbon burying is formed preliminarily, and the conditions of industrial popularization and application are provided.
Along with CO 2 Popularization of oil displacement technology, and service environment of pipeline contains a large amount of CO 2 The gas has more severe corrosion to the pipeline, and the corrosion protection of the steel pipeline faces another great challenge and contains high CO 2 The problem of corrosion of associated gas pipelines has become a constraint on CO 2 The key of the rapid, safe and efficient development of the oil displacement technology.
Aiming at the problem of pipeline corrosion, students develop various methods for slowing down the corrosion; wherein, the corrosion inhibitor has a great proportion in the corrosion prevention industry; therefore, the addition of the corrosion inhibitor is a convenient, economical and effective method for solving the corrosion problem in the industrial production process. An efficient corrosion inhibitor can greatly reduce the corrosion rate of metal equipment, prolong the service life of the equipment and save energy and materials. Through indoor evaluation, a large number of existing vapor phase corrosion inhibitors cannot meet the requirements of CCS-EOR working conditions; therefore, the development of the special efficient corrosion inhibitor is carried out in a matched way, and the method has important practical significance for promoting the rapid development of new energy business in China.
The conventional corrosion inhibitors are various and classified according to film forming properties of the corrosion inhibitors, and generally can be classified into adsorption film type corrosion inhibitors, precipitation film type corrosion inhibitors and oxidation film type corrosion inhibitors.
The adsorption film type corrosion inhibitor is generally organic molecules, has very special molecular structure and has the characteristic of amphipathy, such as CO 2 Imidazoline derivative corrosion inhibitors used in the environment. The corrosion inhibitor structure can be generally divided into two parts, wherein one part is formed by nonpolar groups with long chains and has the characteristic of hydrophobicity; the other part is composed of hydrophilic polar groups, and the whole molecule has the characteristic of amphipathy. The polar groups of the corrosion inhibitor molecules are adsorbed on the metal surface, the long chain at the hydrophobic end extends to the solution, and the whole molecules are orderly arranged on the metal matrix to form a layer of protective film. The film becomes a boundary between the metal and the corrosive environment, and reduces the corrosion reaction. In general, the thickness of the corrosion inhibitor film is nano-scale, and the adsorption film can be monomolecular layer adsorption or multi-molecular layer adsorption. The adsorption film type corrosion inhibitor has wide application, low price and available raw materials, and is the most applicable corrosion inhibitor type in industry.
The precipitation film type corrosion inhibitor is generally inorganic molecules, is mostly inorganic salt, is easily soluble in water, can react with anions in the corrosive solution to generate insoluble precipitate, and is covered and gathered on the surface of metal to form a layer of water-insoluble precipitation film, so that the contact between the metal substrate and the corrosive environment is blocked, and the corrosion effect is slowed down. The precipitated film type corrosion inhibitor is greatly influenced by the anion solubility of the corrosion solution, is easy to form large blocks and aggregate, but has lower compactness and porosity, so that the metal surface is easy to form pitting corrosion, and the precipitated film type corrosion inhibitor is widely used in special corrosion environments in industry and has a small application range.
The oxide film type corrosion inhibitor is generally an inorganic salt molecule. The corrosion inhibition mechanism is that some chemical substances react with metal atoms to oxidize the metal atoms, and a layer of oxide film is formed on the surface of the metal to block the corrosion environment, so that the effect of slowing down the corrosion is achieved. The corrosion inhibitor has the defects of poor applicability, can only be used for specific metals, and can play a remarkable role in inhibiting corrosion for metals which can be passivated, but has poor effect on metals which do not react. The corrosion inhibition efficiency is greatly influenced by the additive amount, which is called a dangerous corrosion inhibitor, and the insufficient additive amount can cause the loss of a protective film to form a corrosion battery system, so that the corrosion reaction can be increased. Therefore, the dosage is strictly controlled when in use.
In recent decades, organic corrosion inhibitors have gradually replaced inorganic corrosion inhibitors due to their remarkable corrosion inhibiting effect, and a wide range of applications. Research on organic corrosion inhibitors has been developed in rapid progress and is widely applied to industrial production. Among the acidifying corrosion inhibitors commonly used in the industry today are quinoline derivatives, imidazoline derivatives, pyridine derivatives and Mannich base derivative corrosion inhibitors.
The corrosion inhibitor can be divided into a gas-phase corrosion inhibitor and a liquid-phase corrosion inhibitor according to the use environment, wherein the rust prevention principle of the gas-phase corrosion inhibitor is similar to that of camphor balls, and the gas-phase corrosion inhibitor is characterized by automatically and continuously sublimating and volatilizing into gas at normal temperature, and can perform rust prevention protection on metals such as steel when the gas reaches a saturated state.
The protection of the gas phase corrosion inhibitor on the pipe is all-sided, the workpiece is provided with a small hole which is bent in a slender way, or is provided with a small blind hole, and the gas phase corrosion inhibitor can complete the corrosion inhibition task. The gas phase corrosion inhibitor is an active corrosion inhibition material, and can keep the corrosion inhibition state as long as the sealing environment is permitted and the corrosion inhibitor is still in, so that the corrosion inhibition function cannot be lost due to the damage of the coating, and the longest corrosion inhibition period can reach 12-20 years. Therefore, in recent years, vapor phase corrosion inhibitors are also becoming one of the main corrosion inhibiting materials for steel.
The application range and the corrosion inhibition effect of various gas phase corrosion inhibitors are greatly different, and the single use of one gas phase corrosion inhibitor has the limitation, and three effects can appear in the compounding of the corrosion inhibitors, namely, the simple addition result of the corrosion inhibition efficiency has no interaction; secondly, the corrosion inhibition efficiency is greatly enhanced, which is called a synergistic effect; thirdly, the corrosion inhibition efficiency is obviously reduced, which is called antagonistic effect. The mechanism of synergy and antagonism effect between corrosion inhibitors is very complex, and may relate to functional groups, aromaticity, possible space effect, electron density of a donor, type of corrosion medium and interaction between an atomic orbit of the corrosion inhibitor and a metal atomic orbit, so that the deep research on the compounding mechanism of the corrosion inhibitor is less in China. At present, the compounding of the vapor phase corrosion inhibitor mostly adopts an orthogonal test design.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a preparation method of a vapor phase corrosion inhibitor.
The invention discloses a preparation method of a vapor phase corrosion inhibitor, which comprises the following steps:
adding aldehyde and amine in proportion into a reaction vessel provided with a stirring and reflux device;
adding a catalyst and absolute ethyl alcohol serving as a solvent into a reaction container, and reacting for a preset time at normal temperature;
after the normal temperature reaction is finished, dropwise adding ketone into a reaction container, heating, and continuing to reflux for a preset time to obtain a corrosion inhibitor main agent;
and (3) compounding the required monomers into the main inhibitor in proportion to obtain the gas-phase inhibitor.
As a further improvement of the present invention, the reaction vessel is a three-necked flask.
As a further improvement of the invention, the aldehyde package is aldehyde with benzene ring, the amine is amine with benzene ring, and the molar ratio of the aldehyde to the amine is 1:1.1.
As a further improvement of the invention, the catalyst is hydrochloric acid or acetic acid, the adding amount of the catalyst is 4ml/100ml of reactant, and the adding amount of the absolute ethyl alcohol is 20ml/100ml of reactant to 50ml/100ml of reactant.
As a further improvement of the invention, the reaction time at normal temperature is 1-2 h.
As a further improvement of the present invention, the ketone includes a ketone having a benzene ring, and the molar ratio of the addition amount of the ketone to the addition amount of the amine is 1:1.
as a further improvement of the invention, the temperature of the reflux reaction is 110-150 ℃ and the time of the reflux reaction is 18h.
As a further improvement of the invention, the formula and the proportion of the vapor phase corrosion inhibitor are as follows:
mannich base product: OP-10: the mass ratio of DMF is 1:1:1.
As a further improvement of the invention, the vapor phase corrosion inhibitor is used as a high-pressure resistant, high-temperature resistant and high-CO-content corrosion inhibitor 2 Special gas-phase corrosion inhibitor for CCS-EOR of environment.
As a further improvement of the invention, the applied metal of the vapor phase corrosion inhibitor comprises 20# steel and L415 carbon steel, and the corrosion inhibition effect of the vapor phase corrosion inhibitor is evaluated to obtain the chemical adding concentration of the vapor phase corrosion inhibitor not lower than 800mg/L.
Compared with the prior art, the invention has the beneficial effects that:
the preparation method of the invention adopts low price, is easy to obtain, has simple synthesis method, short synthesis time, is suitable for mass production, and is suitable for high pressure, high temperature and high CO 2 The L415 steel material under the working condition has obvious corrosion inhibition effect, the corrosion inhibitor contains a plurality of Mannich base molecules with benzene ring structures, the corrosion inhibition effect of the corrosion inhibitor exceeds that of most of the existing corrosion inhibitors, and the corrosion inhibitor has great significance for promoting the popularization and development of CCS-EOR, and has huge space to be researched and developed.
Drawings
FIG. 1 is a flow chart of a method for preparing a vapor phase corrosion inhibitor disclosed in the present invention;
FIG. 2 is a schematic diagram of the apparatus required for synthesizing the vapor phase corrosion inhibitor according to the present disclosure;
FIG. 3 is a product diagram of the vapor phase corrosion inhibitor disclosed in the present invention;
FIG. 4 is a bar graph of the corrosion rate of a pipe under the action of various corrosion inhibitors of the present disclosure.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in FIG. 1, the invention provides a preparation method of a vapor phase corrosion inhibitor, which comprises the following steps:
step 1, adding aldehyde and amine into a three-neck flask with a stirring and refluxing device according to a certain proportion; wherein, the aldehyde is aldehyde with benzene ring, the amine is amine with benzene ring, and the molar ratio of the aldehyde to the amine is 1:1.1.
Step 2, adding a catalyst and absolute ethyl alcohol serving as a solvent into the three-neck flask, and reacting at normal temperature for preset time; wherein the catalyst is hydrochloric acid or acetic acid, the adding amount of the catalyst is 4ml/100ml reactant, the adding amount of the absolute ethyl alcohol is 20ml/100ml reactant to 50ml/100ml reactant, the reaction time at normal temperature is 1h to 2h, and the reaction is preferably carried out at normal temperature for 1h.
Step 3, after the normal-temperature reaction is finished, dropwise adding ketone into the reaction container, heating, and continuing to reflux the reaction for a preset time to obtain a corrosion inhibitor main agent; wherein, the ketone is ketone with benzene ring, and the molar ratio of the addition amount of ketone to the addition amount of amine is 1:1, the temperature of the reflux reaction is 110-150 ℃, and the time of the reflux reaction is 18h.
Step 4, compounding the required monomers into the main inhibitor agent in proportion to obtain the vapor phase inhibitor HKXJ-1; wherein, the formula and the proportion of the vapor phase corrosion inhibitor are specifically Mannich base products: OP-10: the mass ratio of DMF is 1:1:1.
The synthesis device of the Mannich base is shown in figure 2, and the prepared vapor phase corrosion inhibitor finished product is shown in figure 3.
The vapor phase corrosion inhibitor prepared based on the steps 1-4 contains a large amount of Mannich base compounds and can be used as a high-pressure resistant, high-temperature resistant and high-CO-content corrosion inhibitor 2 The special gas-phase corrosion inhibitor for CCS-EOR of the environment comprises 20# steel and L415 carbon steel, preferably L415 carbon steel, and the dosing concentration of the gas-phase corrosion inhibitor is not lower than 800mg/L.
The invention provides a corrosion inhibition effect evaluation method of a vapor phase corrosion inhibitor HKXJ-1, which combines with CO 2 Preparing an air source according to the oil displacement process parameters and associated gas pipeline conveying conditions, and performing indoor gas phase corrosion inhibitor screening and corrosion inhibition effect evaluation; test reference SY/T7437-2019 corrosion inhibitor technical requirement for natural gas gathering and transportation and evaluation method; meanwhile, the distribution condition of gas-liquid components in the pipeline is simulated indoors, and a weight loss experiment is carried out to evaluate the performance of the corrosion inhibitor.
The specific evaluation method comprises the following steps:
s1, preparing an L415 sample meeting requirements, wherein the sample size is a fixed size: 50mm by 10mm by 3mm.
S2, taking out the sample from the package, soaking the sample in acetone for degreasing, and then putting the sample into ethanol for dehydration; drying the ethanol on the surface of the hanging piece, wrapping with filter paper, and putting the wrapped hanging piece into a drying bottle. The dimensions were then measured and weighed to the nearest 0.1mg.
S3, fixing the test piece on a hanging shaft of the reaction kettle, wherein the hanging shaft is arranged on a rotating shaft of the reaction kettle, and adding the vapor phase corrosion inhibitor into the reaction kettle. And hanging the sample above the experimental solution, sealing the reaction kettle, opening an air inlet valve, and introducing a prepared air source.
S4, starting to heat until the experimental temperature is reached, and starting to time after the experimental temperature is reached, wherein the time is 5d.
S5, closing the switch after the experiment is finished, removing the kettle cover, taking out the hanging piece, recording the surface corrosion condition, washing away surface substances, and observing.
S6, soaking the hanging piece in pickling solution, and removing the reaction product of the test piece by using sand paper. Putting into ethanol for dehydration. Wrapped with filter paper, placed in a dry bottle for 1h, weighed to the nearest 0.1mg, and the average corrosion rate was calculated by the weight difference between the samples before and after corrosion.
The corrosion rate was calculated according to equation (1), and the average of three parallel experiments was taken as the average corrosion rate.
Wherein:
V i corrosion rate, g/(m) 2 .h)；
Delta t-reaction time, h;
△m i -test piece corrosion loss, g;
A i total area of test piece, mm 2 ；
The natural gas composition is shown in Table 1 (Ansheng 3 is used as the test gas source).
Table 1 table of gas reservoir natural gas properties
Test temperature 60 ℃, material quality is L415, test dosing concentration: 200mg/L, 500mg/L, 800mg/L, 1000mg/L, and the test results are shown in Table 2 below.
TABLE 2 Corrosion inhibitor evaluation test data sheet
Experiments show that when the adding amount of the HKXJ-1 corrosion inhibitor is 1000mg/L, the corrosion rate is 0.0783mm/a, the HKXJ-1 has a better corrosion inhibition effect, and the corrosion inhibition effect of the HKXJ-1 corrosion inhibitor is further improved along with the further increase of the adding amount, so that the requirement of uniform corrosion rate in the technical requirement and evaluation method (SY/T7437-2019) of the corrosion inhibitor for natural gas gathering and transportation is met.
And collecting other types of gas-phase corrosion inhibitors currently on the market, and performing corrosion inhibitor performance comparison evaluation tests. The experimental results are as follows:
other types of corrosion inhibitors are shown in Table 3.
TABLE 3 Corrosion inhibitor names and sources
| Corrosion inhibitor designation | Numbering device | Corrosion inhibitor source |
| DE-689 | 1 | Manufacturer 1 |
| DE-680 | 2 | Manufacturer 2 |
| Vapor phase corrosion inhibitor | 3 | Manufacturer 3 |
| ZMC-50 | 4 | Manufacturer 4 |
| Corrosion inhibitor for oil gas gathering and transportation | 5 | Manufacturer 5 |
| HYI-01 | 6 | Manufacturer 6 |
| HYI-02 | 7 | Manufacturer 7 |
| HKXJ-1 | 8 | Development of the present study |
Test temperature 60 ℃, material quality is L415, test dosing concentration: 200mg/L, 500mg/L, 800mg/L, 1000mg/L, and the test results are shown in the following Table 4 and FIG. 4, and the dosing concentration of each corrosion inhibitor in FIG. 4 is as follows in order from left to right: 200mg/L, 500mg/L, 800mg/L, 1000mg/L.
TABLE 4 Corrosion inhibitor Performance test data sheet at different dosing concentrations
The test results show that the corrosion inhibition performance of 8 corrosion inhibitors selected in the test process shows a trend of decreasing corrosion rate along with the increase of the test dosing concentration; under the same test conditions, the corrosion inhibitor HKXJ-1 has the best slow release effect, the corrosion rate of the same dosage is the lowest, and when the dosage is 1000mg/L, the corrosion rate can be reduced to 0.0783mm/a by adding the test piece of the HKXJ-1, and the corrosion inhibition effect is good.
In summary, HKXJ-1 has been shown to be suitable for high temperature, high pressure and high CO 2 Corrosion inhibitor under working conditions.
The corrosion inhibitor has the advantages that the corrosion inhibition effect of the corrosion inhibitor is superior to that of the existing Mannich base derivative corrosion inhibitor, the Mannich base molecules with a plurality of benzene ring structures are innovatively designed through molecular design, corresponding raw materials are selected for synthesis, the synthesis efficiency is improved through exploring synthesis conditions, the Mannich base molecule content in a final product is improved, the dispersibility of a Mannich base reactant in an aqueous solution is improved through innovatively selecting a proper dispersing agent, and finally the corrosion inhibitor formula HKXJ-1 suitable for high-temperature, high-pressure and high-CO 2 working conditions is successfully explored.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for preparing a vapor phase corrosion inhibitor, comprising the steps of:
adding aldehyde and amine in proportion into a reaction vessel provided with a stirring and reflux device;
adding a catalyst and absolute ethyl alcohol serving as a solvent into a reaction container, and reacting for a preset time at normal temperature;
after the normal temperature reaction is finished, dropwise adding ketone into a reaction container, heating, and continuing to reflux for a preset time to obtain a corrosion inhibitor main agent;
and (3) compounding the required monomers into the main inhibitor in proportion to obtain the gas-phase inhibitor.
2. The method for producing a vapor phase corrosion inhibitor according to claim 1, wherein the reaction vessel is a three-necked flask.
3. The method for preparing a vapor phase corrosion inhibitor according to claim 1, wherein the aldehyde package is an aldehyde with a benzene ring, the amine is an amine with a benzene ring, and the molar ratio of the aldehyde to the amine is 1:1.1.
4. The method for preparing a vapor phase corrosion inhibitor according to claim 1, wherein the catalyst is hydrochloric acid or acetic acid, the catalyst is added in an amount of 4ml/100ml of reactant, and the absolute ethyl alcohol is added in an amount of 20ml/100ml of reactant to 50ml/100ml of reactant.
5. The method for preparing a vapor phase corrosion inhibitor according to claim 1, wherein the reaction time at normal temperature is 1 to 2 hours.
6. The method for preparing a vapor phase corrosion inhibitor according to claim 1, wherein the ketone comprises a ketone having a benzene ring, and the molar ratio of the addition amount of the ketone to the addition amount of the amine is 1:1.
7. the method for preparing a vapor phase corrosion inhibitor according to claim 1, wherein the temperature of the reflux reaction is 110 ℃ to 150 ℃ and the time of the reflux reaction is 18 hours.
8. The method for preparing the vapor phase corrosion inhibitor according to claim 1, wherein the formulation and the proportion of the vapor phase corrosion inhibitor are as follows:
mannich base product: OP-10: the mass ratio of DMF is 1:1:1.
9. The method for preparing a vapor phase corrosion inhibitor according to claim 1, wherein the vapor phase corrosion inhibitor is used as a high-pressure resistant, high-temperature resistant and high-CO-content corrosion inhibitor 2 Special gas-phase corrosion inhibitor for CCS-EOR of environment.
10. The method for preparing a vapor phase corrosion inhibitor according to claim 1, wherein the metal used for the vapor phase corrosion inhibitor comprises 20# steel and L415 carbon steel, and the corrosion inhibition effect of the vapor phase corrosion inhibitor is evaluated to obtain the chemical dosing concentration of the vapor phase corrosion inhibitor not lower than 800mg/L.
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