CN113930774A - Corrosion inhibitor and preparation method and application thereof - Google Patents
Corrosion inhibitor and preparation method and application thereof Download PDFInfo
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- CN113930774A CN113930774A CN202111228014.5A CN202111228014A CN113930774A CN 113930774 A CN113930774 A CN 113930774A CN 202111228014 A CN202111228014 A CN 202111228014A CN 113930774 A CN113930774 A CN 113930774A
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- corrosion inhibitor
- solution
- naoh
- monomethylamine
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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
- C23F11/141—Amines; Quaternary ammonium compounds
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/04—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups
- C07C209/06—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of halogen atoms
- C07C209/08—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of halogen atoms with formation of amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C211/00—Compounds containing amino groups bound to a carbon skeleton
- C07C211/01—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms
- C07C211/26—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an unsaturated carbon skeleton containing at least one six-membered aromatic ring
- C07C211/27—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an unsaturated carbon skeleton containing at least one six-membered aromatic ring having amino groups linked to the six-membered aromatic ring by saturated carbon chains
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A corrosion inhibitor, which consists of the following components: the molar ratio of methylamine solution, benzyl chloride and NaOH to monomethylamine solution, benzyl chloride and NaOH is 1:2.5: 2; the corrosion inhibitor is prepared by using the monomethylamine solution as a reaction substrate through one-step synthesis reaction, the selected materials are wide in source, low in cost and mild in reaction conditions, the raw materials can be recycled, the method is simple, and the yield reaches over 55%. The corrosion inhibitor provided by the invention has a hydrophobic chain and a hydrophobic group, and can form a stable adhesive film on the metal surface through hydrophilic and hydrophobic effects or electrostatic effects or coordination effects after being prepared into the corrosion inhibitor, so that the contact between an aqueous medium and metal is isolated, and the hydrophobic chain and the hydrophobic group can play a good role in protection.
Description
Technical Field
The invention belongs to the technical field of corrosion inhibitors, and particularly relates to a corrosion inhibitor and a preparation method and application thereof.
Background
The corrosion inhibitor is a chemical substance or a compound which can inhibit or slow down corrosion when existing in an environmental medium in a proper concentration and form, and has the advantages of simple and convenient process, low cost, good protection effect, strong applicability and the like. The candle-retarding agent technology is widely applied to the technical processes of chemical cleaning, water treatment and the like in the industrial production processes of petrochemical industry, mechanical manufacturing, steel, electric power and the like.
In the acidizing work process, the injection of acid liquor can cause the corrosion of oil and gas well tubular products and underground metal equipment, the sudden rupture accident of the underground tubular products can be caused when the acid liquor is serious, serious potential safety hazards exist, and meanwhile, the metal iron ions corroded by the acid liquor can cause damage to the stratum. In order to prevent the acid liquor from corroding equipment such as oil pipes and sleeves, the addition of a corrosion inhibitor into the acid liquor is an indispensable and most common and effective corrosion prevention measure.
The corrosion inhibitor has hydrophilic and hydrophobic functional groups, and the hydrophilic functional groups can interact with the surface of the metal and further adsorb on the metal to block active parts of the metal exposed in corrosive media and reduce corrosion; and the hydrophobic end can phase into the corrosive medium, so that a hydrophobic layer is formed and repels the corrosive medium, and the hydrophobic group is mostly composed of alkane.
From the perspective of adsorption theory, the corrosion inhibitor has adsorption effect on the metal surface, and forms an adsorption film on the metal surface, thereby slowing down the corrosion of the metal; from the theory of film formation, the corrosion inhibitor reacts with metal to generate a passive film or reacts with ions in a medium to form a precipitation film so as to slow down the corrosion of the metal; from the electrochemical theory, the action mechanism of the corrosion inhibitor is the attachment stagnation effect on the electrode process.
As the development of oil and gas fields is in the middle and later stages, the well depth is continuously increased, the temperature of the well bottom is also continuously increased, the acidification construction is more frequent, the acidizing acid liquid used for acidification is diversified, the concentration is also continuously increased, the more rigorous requirement is provided for the acidification corrosion inhibitor, in addition, the environmental protection consciousness, the safety consciousness and the sustainable development consciousness are continuously deepened, the components of the corrosion inhibitor are gradually greened and sustainable on the premise of reaching the standard, and the future development trend of the acidification corrosion inhibitor gradually moves forward to the development of a green high-temperature-resistant corrosion inhibition main agent, a green high-temperature-resistant corrosion inhibition synergist and the accelerated corrosion inhibition action mechanism research. The existing corrosion inhibitors have poor temperature resistance and pungent smell, do not accord with the modern concept of green environmental protection, and have complex synthesis process and high energy consumption. Therefore, the development of a high-temperature-resistant and environment-friendly corrosion inhibitor is urgent.
Disclosure of Invention
The invention aims to provide a corrosion inhibitor, a preparation method and application thereof, which aim to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a corrosion inhibitor, which consists of the following components: the molar ratio of methylamine solution, benzyl chloride and NaOH to monomethylamine solution, benzyl chloride and NaOH is 1:2.5: 2;
the structural formula of the corrosion inhibitor is as follows:
further, the preparation method of the corrosion inhibitor comprises the following steps:
step 1, dissolving monomethylamine in methanol to obtain monomethylamine solution, and dropwise adding benzyl chloride into the monomethylamine solution to obtain solution A;
step 2, dividing NaOH into four equal parts, and adding NaOH into the solution A at equal time intervals;
and 3, adding a NaOH solution A, washing with saturated salt solution after the reaction is finished, finally carrying out reduced pressure distillation to obtain a white solid, namely a product, dissolving the product with ethyl acetate, wherein the mass ratio of the product to the ethyl acetate is 1:5, and thus obtaining the surfactant type corrosion inhibitor.
Further, the reaction temperature of the step 1 is 40-60 ℃.
Furthermore, the time interval of NaOH is half an hour, and the reaction time is 6-12 hours.
Further, the monomethylamine solution is a 40% monomethylamine aqueous solution
Further, NaOH was 32% NaOH aqueous solution.
Furthermore, the solvent is solvent-free or methanol or toluene.
Furthermore, the application of the corrosion inhibitor is used as a slow release agent.
Compared with the prior art, the invention has the following technical effects:
the corrosion inhibitor is prepared by using the monomethylamine solution as a reaction substrate through one-step synthesis reaction, the selected materials are wide in source, low in cost and mild in reaction conditions, the raw materials can be recycled, the method is simple, and the yield reaches over 55%. The corrosion inhibitor provided by the invention has a hydrophobic chain and a hydrophobic group, and can form a stable adhesive film on the metal surface through hydrophilic and hydrophobic effects or electrostatic effects or coordination effects after being prepared into the corrosion inhibitor, so that the contact between an aqueous medium and metal is isolated, and the hydrophobic chain and the hydrophobic group can play a good role in protection.
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.
The corrosion inhibitor obtained by the invention is shown in the formula (I):
the preparation method of the corrosion inhibitor comprises the following two steps: dripping benzyl chloride into a reaction substrate; ② adding 4 equal portions of NaOH aqueous solution into the reaction solution.
Further, the amount of benzyl chloride added in the step (i) is 2.5mol, and the amount of NaOH added in the step (ii) is 2mol, corresponding to 1mol of monomethylamine solution.
Further, the solvent includes but is not limited to no solvent, methanol, toluene.
Furthermore, the reaction temperature is 40-60 ℃, and the reaction time is 6-10 h.
Preferably, the reaction temperature is 50 ℃, and the reaction time is 6 h.
Further, application of methyldibenzylamine in the field of oil field development.
Example 1
Preparation of methyldibenzylamine
Accurately weighing 19.625g (0.25mol) of monomethylamine, dissolving in 100mL of methanol, placing in a reaction kettle, slowly dropwise adding 79.119g (0.625mol) of benzyl chloride into the reaction kettle, heating to 50 ℃, adding 62.5g (0.5mol) of NaOH into the reaction kettle in four equal parts per 0.5h, carrying out heat preservation reaction for 4h after finishing dripping, separating to obtain an upper organic phase after the reaction is finished, washing with deionized water for 3 times, and drying in a vacuum oven at 50 ℃ for 6h to obtain methyldibenzylamine.
Example 2
Preparation of methyldibenzylamine
Accurately weighing 19.625g (0.25mol) of monomethylamine, dissolving in 100mL of methanol, placing in a reaction kettle, slowly dropwise adding 79.119g (0.625mol) of benzyl chloride into the reaction kettle, heating to 40 ℃, adding 62.5g (0.5mol) of NaOH into the reaction kettle in four equal parts per 0.5h, carrying out heat preservation reaction for 4h after finishing dripping, separating to obtain an upper organic phase after the reaction is finished, washing with deionized water for 3 times, and drying in a vacuum oven at 50 ℃ for 6h to obtain methyldibenzylamine.
Example 3
Preparation of methyldibenzylamine
Accurately weighing 19.625g (0.25mol) of monomethylamine, dissolving in 100mL of methanol, placing in a reaction kettle, slowly dropwise adding 79.119g (0.625mol) of benzyl chloride into the reaction kettle, heating to 60 ℃, adding 62.5g (0.5mol) of NaOH into the reaction kettle in four equal parts per 0.5h, carrying out heat preservation reaction for 4h after finishing dripping, separating to obtain an upper organic phase after the reaction is finished, washing with deionized water for 3 times, and drying in a vacuum oven at 50 ℃ for 6h to obtain methyldibenzylamine.
Example 4
The corrosion inhibitor is prepared by the following steps:
weighing three types of methyldibenzylamine with different reaction temperatures, dissolving the methyldibenzylamine in 4 times of anhydrous ethanol by mass, adding protonic acid, stirring until the solution is clear and uniform, adding NaOH to adjust the reaction solution to be neutral, and stirring for 0.5h to obtain the surface active agent type corrosion inhibitor.
Preparing 20% acid liquor by using deionized water, adding a corrosion inhibitor into the acid liquor for testing the corrosion inhibition rate of the N80 steel sheet in the acid liquor, and testing according to SY/T5405-1996 performance test method and evaluation index of the corrosion inhibitor for acidification.
As can be seen from the table, the lower the corrosion inhibition rate, the more stable the adhesion film formed on the metal surface by the prepared corrosion inhibitor is, the more effective the contact between the aqueous medium and the metal can be isolated. The methyldibenzylamine corrosion inhibitor prepared at 50 ℃ has good water solubility and corrosion inhibition performance, and the corrosion inhibition rate can reach 2.89 g/(m)2H) meet the industry requirements. Therefore, the invention has certain reference significance for the molecular structure design of the corrosion inhibitor.
Claims (8)
1. The corrosion inhibitor is characterized by comprising the following components: the molar ratio of methylamine solution, benzyl chloride and NaOH to monomethylamine solution, benzyl chloride and NaOH is 1:2.5: 2;
the structural formula of the corrosion inhibitor is as follows:
2. a method for preparing a corrosion inhibitor according to claim 1, comprising the steps of:
step 1, dissolving monomethylamine in methanol to obtain monomethylamine solution, and dropwise adding benzyl chloride into the monomethylamine solution to obtain solution A;
step 2, dividing NaOH into four equal parts, and adding NaOH into the solution A at equal time intervals;
and 3, adding a NaOH solution A, washing with saturated salt solution after the reaction is finished, finally carrying out reduced pressure distillation to obtain a white solid, namely a product, dissolving the product with ethyl acetate, wherein the mass ratio of the product to the ethyl acetate is 1:5, and thus obtaining the surfactant type corrosion inhibitor.
3. The preparation method of the corrosion inhibitor according to claim 2, wherein the reaction temperature in the step 1 is 40-60 ℃.
4. The preparation method of the corrosion inhibitor according to claim 2, wherein the time intervals of NaOH are half an hour, and the reaction time is 6-12 hours.
5. The method of claim 2, wherein the monomethylamine solution is a 40% aqueous solution of monomethylamine.
6. The method of claim 2, wherein the NaOH is 32% NaOH aqueous solution.
7. The method for preparing corrosion inhibitor according to claim 2, wherein the solvent is solvent-free or methanol or toluene.
8. The application of the corrosion inhibitor is characterized in that the corrosion inhibitor is used as a slow release agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111228014.5A CN113930774A (en) | 2021-10-21 | 2021-10-21 | Corrosion inhibitor and preparation method and application thereof |
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| CN202111228014.5A CN113930774A (en) | 2021-10-21 | 2021-10-21 | Corrosion inhibitor and preparation method and application thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200341A (en) * | 1981-05-22 | 1982-12-08 | Huels Chemische Werke Ag | Manufacture of n-benzyl-n-isopropylpivaloylamide |
| WO2012058552A1 (en) * | 2010-10-29 | 2012-05-03 | Intezyne Technologies, Incorporated | Iron stabilized polymer micelles for drug delivery applications |
| CN109402639A (en) * | 2018-10-23 | 2019-03-01 | 西南石油大学 | A kind of preparation method and application of dibenzylamine quaternary ammonium salt high temperature resistant acidification corrosion inhibitor |
-
2021
- 2021-10-21 CN CN202111228014.5A patent/CN113930774A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200341A (en) * | 1981-05-22 | 1982-12-08 | Huels Chemische Werke Ag | Manufacture of n-benzyl-n-isopropylpivaloylamide |
| WO2012058552A1 (en) * | 2010-10-29 | 2012-05-03 | Intezyne Technologies, Incorporated | Iron stabilized polymer micelles for drug delivery applications |
| CN109402639A (en) * | 2018-10-23 | 2019-03-01 | 西南石油大学 | A kind of preparation method and application of dibenzylamine quaternary ammonium salt high temperature resistant acidification corrosion inhibitor |
Non-Patent Citations (2)
| Title |
|---|
| ACS: "化合物", STN检索报告, pages 1 * |
| NGUYEˆT-THANH HA-DUONG等: "Ticlopidine as a Selective Mechanism-Based Inhibitor of Human Cytochrome P450 2C19", BIOCHEMISTRY, vol. 40, no. 40, pages 12112 - 12122 * |
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