Thioureido modified imidazoline derivative corrosion inhibitor and preparation method and application of thioureido modified imidazoline derivative corrosion inhibitor

A technology based on imidazoline and thiourea, which is applied in the field of thiourea-modified imidazoline derivative corrosion inhibitors and its preparation, can solve the problems of poor application of corrosion, poor film-forming properties, and few electron-donating groups. Good corrosion inhibition effect, good fluidity and low toxicity

Active Publication Date: 2018-08-31
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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  • Thioureido modified imidazoline derivative corrosion inhibitor and preparation method and application of thioureido modified imidazoline derivative corrosion inhibitor
  • Thioureido modified imidazoline derivative corrosion inhibitor and preparation method and application of thioureido modified imidazoline derivative corrosion inhibitor
  • Thioureido modified imidazoline derivative corrosion inhibitor and preparation method and application of thioureido modified imidazoline derivative corrosion inhibitor

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Embodiment 1

[0035] This embodiment provides a preparation method of a thiourea-based modified imidazoline derivative corrosion inhibitor. The thiourea group-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 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, and in the presence of water-carrying agent xylene, benzoic acid (1 mol) and diethylene triamine (1.3 mol) are heated gradually, and the reaction is carried out at 100° C. for 2 hours; The temperature was then raised to 210°C for cyclization reaction, 4h, to obtain the imidazoline intermediate; cooled to 80°C, benzyl chloride (1.2mol) was slowly added dropwise for quaternization...

Embodiment 2

[0040] This embodiment provides a preparation method of a bisthiourea-based modified imidazoline derivative corrosion inhibitor. The dithiourea group-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 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, and in the presence of water-carrying agent xylene, benzoic acid (1 mol) and diethylene triamine (1.3 mol) are heated gradually, and the reaction is carried out at 100° C. for 2 hours; The temperature was then raised to 210°C for cyclization reaction, 4h, to obtain the imidazoline intermediate; cooled to 80°C, benzyl chloride (1.2mol) was slowly added dropwise for quaterniza...

Embodiment 3

[0045] This embodiment provides a preparation method of a phenylthiourea-based modified imidazoline derivative corrosion inhibitor. The phenylthiourea group-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] The present embodiment provides the specific synthesis steps of the above-mentioned phenylthiourea group-modified imidazoline, and the specific steps are as follows:

[0047] Add benzoic acid and diethylenetriamine into the container, and in the presence of water-carrying agent xylene, benzoic acid (1 mol) and diethylene triamine (1.3 mol) are heated gradually, and the reaction is carried out at 100° C. for 2 hours; The temperature was then raised to 210°C for cyclization reaction, 4h, to obtain the imidazoline intermediate; cooled to 80°C, benzyl chloride (1.2mol) was s...

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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 of oil and gas field corrosion inhibitors, and particularly relates to a thiourea-based modified imidazoline derivative corrosion inhibitor and a preparation method and application thereof. Background technique [0002] The oil and gas extraction and processing industry has historically suffered from severe 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 be present 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 extraction 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, and the corrosion resistance of steel equipment is poor. 2 , H 2 S acid gas will promote different forms of electrochem...

Claims

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Application Information

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Patent Type & Authority Applications(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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