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Imidazolyl thiourea derivative, corrosion inhibitor and preparation method thereof

A technology of imidazolyl thiourea and azole thiourea, which is applied in the fields of imidazolyl thiourea derivatives, corrosion inhibitors and their preparation, can solve the problems of inapplicability of corrosion inhibitors and achieve good anti-corrosion effects

Inactive Publication Date: 2016-03-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Corrosion inhibitors provided by prior art are not suitable for CH 3 COOH-H 2 S-CO2-Cl — Anticorrosion of metals in corrosive environments

Method used

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  • Imidazolyl thiourea derivative, corrosion inhibitor and preparation method thereof
  • Imidazolyl thiourea derivative, corrosion inhibitor and preparation method thereof
  • Imidazolyl thiourea derivative, corrosion inhibitor and preparation method thereof

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preparation example Construction

[0040] In the third aspect, the embodiment of the present invention provides a preparation method of the above imidazolyl thiourea derivative, which comprises: adding thiourea and organic amine into a reactor, and making the thiourea and organic amine be at 150-170°C, preferably at React at a temperature of 160°C for 1.5-3.5h, preferably 2h, while using dilute hydrochloric acid or water to absorb the tail gas generated during the reaction; then add organic acid to the reactor and continue at 150-170°C, preferably at The reaction was carried out at a temperature of 160°C for 1.5-3.5h, preferably 2h, and the product in the reactor was collected to obtain an imidazolyl thiourea derivative; wherein the thiourea, organic amine and organic acid added in the reactor The same amount.

[0041] In the preparation method of the imidazolyl thiourea derivatives, thiourea and organic amines react first to remove a part of the ammonia gas to generate an amino thiourea derivative, and then furth...

Embodiment 1

[0059] In a four-necked flask with a stirrer, a thermometer and a reflux condenser with a branch pipe connected to a water separator, add 1 mole of thiourea and 1 mole of triethylenetetramine in turn, react at 150℃ for 3.5h, and use them at the same time Dilute hydrochloric acid absorbs the tail gas produced during the reaction. Then 1 mole of lauric acid was added to the four-necked flask, reacted at 170°C for 1.5h, and finally collected in the four-necked flask to obtain the final product, that is, the imidazolyl thiourea derivative. The structural formula of the imidazolyl thiourea derivative is:

[0060]

Embodiment 2

[0062] In a four-necked flask with a stirrer, a thermometer, and a reflux condenser with a branch pipe connected to a water separator, add 1 mole of thiourea and 1 mole of tetraethylenepentamine in sequence, and react at 160℃ for 2h while using water Absorb the exhaust gas generated during the reaction. Then add 1 mole of n-octanoic acid to the four-necked flask, react at 160°C for 2h, and finally collect the four-necked flask to obtain the final product, that is, the imidazolyl thiourea derivative. The structural formula of the imidazolyl thiourea derivative is:

[0063]

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PUM

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Abstract

The invention discloses an imidazolyl thiourea derivative, a corrosion inhibitor and a preparation method thereof and belongs to the field of corrosion protection of metals. The chemical structural formula of the imidazolyl thiourea derivative is represented by a formula shown in the description, wherein R is alkyl, phenyl or alkenyl containing 6-20 carbon atoms; and n is 0, 1, 2, 3, 4 or 5. The imidazolyl thiourea derivative in the structure disclosed by the invention can be used as an active ingredient for inhibiting metals, particular a L360 carbon steel material metal in a CH3COOH-H2S-Cl- corrosive environment, and has a good corrosion-resistant effect.

Description

Technical field [0001] The invention relates to the field of metal corrosion protection, in particular to an imidazole-based thiourea derivative, a corrosion inhibitor and a preparation method thereof. Background technique [0002] In the process of oil and natural gas extraction, acetic acid, H 2 S, CO 2 Or Cl — , It will cause serious corrosion of metal gathering pipelines or related metal equipment, seriously affecting the normal exploitation of oil and natural gas. Therefore, it is necessary to provide a corrosion inhibitor that inhibits the corrosion of metal gathering pipelines and metal equipment in the above-mentioned corrosive environment. [0003] CN101050537A provides a corrosion inhibitor for inhibiting metal corrosion and a preparation method thereof. The corrosion inhibitor is suitable for use in H 2 S-CO2-Cl — Anti-corrosion of metal in the corrosive environment. The corrosion inhibitor is composed of 25-50% sulfur-containing imidazoline derivatives, 5-10 additive...

Claims

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Application Information

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IPC IPC(8): C07D233/42C23F11/16C09K8/54
Inventor 袁曦张强谷坛陈文汪枫窦丽媛张东岳江晶晶
Owner PETROCHINA CO LTD
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