A kind of thiourea-modified imidazoline derivative corrosion inhibitor and its preparation method and application

A technology of imidazoline and derivatives is applied in the field of thiourea-based modified imidazoline derivative corrosion inhibitor and its preparation field, which can solve the problems of poor film-forming property, few electron-donating bases, unsuitable corrosion, etc. The effect of fluidity, low toxicity and good corrosion inhibition effect

Active Publication Date: 2020-08-28
LUOYANG PACIFIC UNION PETROCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201310524689.3 discloses a synthesis method of a water-soluble imidazoline quaternary ammonium salt corrosion inhibitor. The disadvantage is that it has fewer electron-donating groups, poor film-forming properties, and pitting corrosion is prone to occur in practical applications.
Patent CN201310150090.8 discloses a corrosion inhibitor suitable for carbon steel corrosion in ammonia desulfurization ammonium sulfate system, in which the imidazoline quaternary ammonium salt corrosion inhibitor needs to be compounded with thiourea derivatives and organic amines, Composite steps are cumbersome
[0005] So far, most invention patents are for CO 2 type corrosion, which for H 2 S-dominated corrosion does not work well

Method used

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  • A kind of thiourea-modified imidazoline derivative corrosion inhibitor and its preparation method and application
  • A kind of thiourea-modified imidazoline derivative corrosion inhibitor and its preparation method and application
  • A kind of thiourea-modified imidazoline derivative corrosion inhibitor and its preparation method and application

Examples

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Embodiment 1

[0035] This example provides a preparation method of a thiourea-modified imidazoline derivative corrosion inhibitor. The thiourea-modified imidazoline is obtained by reacting benzoic acid and diethylenetriamine to obtain an imidazoline intermediate, reacting with benzyl chloride to obtain an imidazoline quaternary ammonium salt, and finally reacting with thiourea.

[0036] The present embodiment provides the specific synthesis steps of the above-mentioned modified imidazoline, and the specific steps are as follows:

[0037] Add benzoic acid and diethylenetriamine into the container. Benzoic acid (1mol) and diethylenetriamine (1.3mol) are in the presence of the water-carrying agent xylene, and the temperature is gradually raised, first at 100°C, and reacted for 2h; Then raise the temperature to 210°C for ring formation reaction, 4h, to obtain the imidazoline intermediate; cool to 80°C, slowly add benzyl chloride (1.2mol) dropwise, carry out quaternization reaction, 2 ~ 5h; fina...

Embodiment 2

[0040] This example provides a preparation method of a dithiourea-modified imidazoline derivative corrosion inhibitor. The dithiourea-modified imidazoline is obtained by reacting benzoic acid and diethylenetriamine to obtain an imidazoline intermediate, reacting with benzyl chloride to obtain an imidazoline quaternary ammonium salt, and finally reacting with thiourea.

[0041] The present embodiment provides the specific synthesis steps of the above-mentioned modified imidazoline, and the specific steps are as follows:

[0042]Add benzoic acid and diethylenetriamine into the container. Benzoic acid (1mol) and diethylenetriamine (1.3mol) are in the presence of the water-carrying agent xylene, and the temperature is gradually raised, first at 100°C, and reacted for 2h; Then raise the temperature to 210°C for ring formation reaction, 4h, to obtain the imidazoline intermediate; cool to 80°C, slowly add benzyl chloride (1.2mol) dropwise, carry out quaternization reaction, 2 ~ 5h; f...

Embodiment 3

[0045] This example provides a preparation method of a phenylthiourea-modified imidazoline derivative corrosion inhibitor. The phenylthiourea-modified imidazoline is obtained by reacting benzoic acid and diethylenetriamine to obtain an imidazoline intermediate, then reacting with benzyl chloride to obtain an imidazoline quaternary ammonium salt, and finally reacting with phenylthiourea.

[0046] This embodiment provides the specific synthesis steps of the above-mentioned phenylthiourea-modified imidazoline, and the specific steps are as follows:

[0047] Add benzoic acid and diethylenetriamine into the container. Benzoic acid (1mol) and diethylenetriamine (1.3mol) are in the presence of the water-carrying agent xylene, and the temperature is gradually raised, first at 100°C, and reacted for 2h; Then heat up to 210°C for ring formation reaction, 4h, to obtain the imidazoline intermediate; cool to 80°C, slowly add benzyl chloride (1.2mol) dropwise, carry out quaternization react...

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Abstract

The invention discloses a thioureido modified imidazoline derivative corrosion inhibitor, and the general molecular formula is shown in the description, wherein R is a branched chain with thioureido.The invention provides the thioureido modified imidazoline corrosion inhibitor as a lubricant additive, the phenylboronic acid in the additive is not esterified to borate, so that the problem of poorhydrolytic stability of the borate does not exist, the thioureido modified imidazoline derivative corrosion inhibitor is excellent in hydrolytic stability, and the defect of easiness in hydrolysis ofthe traditional borate additive is well overcome.

Description

technical field [0001] The invention belongs to the technical field of organic compounds for corrosion inhibitors in oil and gas fields, and in particular relates to a thiourea-modified imidazoline derivative corrosion inhibitor and its preparation method and application. Background technique [0002] The oil and gas extraction and processing industry has historically suffered from corrosion. In the production process of oil and gas fields, the acid gas carbon dioxide (CO 2 ), hydrogen sulfide (H 2 S) and water will exist with the production of natural gas. These H 2 S, CO 2 Gas, often mixed with water vapor, enters the gathering and transportation system through oil and gas exploitation and transportation. At present, the oil and gas pipelines and other equipment used in oil and gas fields at home and abroad are mostly made of steel. The corrosion resistance of steel equipment is poor, and the CO dissolved in water 2 、H 2 S acidic gas will promote different forms of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/06C09K8/54C23F11/16
CPCC07D233/06C09K8/54C09K2208/32C23F11/16
Inventor 王永刚李娜王勇楚希杰原怀保
Owner LUOYANG PACIFIC UNION PETROCHEM CO LTD
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