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Imidazoline quaternary ammonium salt corrosion inhibitor and preparation method thereof

A technology of imidazoline quaternary ammonium salt and corrosion inhibitor, which is applied in the field of metal corrosion and protection, can solve the problems of high requirements on device sealing, inability to perform solvent recovery, poor corrosion inhibition performance, etc., and achieves wide application range and low toxicity. , Easy to operate effect

Inactive Publication Date: 2018-12-21
YANAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to provide a kind of imidazoline quaternary ammonium salt corrosion inhibitor, which solves the problem of poor corrosion inhibition performance of existing corrosion inhibitors in acidic medium
[0005] Another object of the present invention is to provide a method for preparing a corrosion inhibitor, which solves the problem that the vacuum method used in the prior art cannot be used to recover the solvent, and requires high sealing of the device; the device used in the method of the present invention Simple and easy to operate

Method used

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  • Imidazoline quaternary ammonium salt corrosion inhibitor and preparation method thereof
  • Imidazoline quaternary ammonium salt corrosion inhibitor and preparation method thereof
  • Imidazoline quaternary ammonium salt corrosion inhibitor and preparation method thereof

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preparation example Construction

[0029] A kind of preparation method of imidazoline quaternary ammonium salt corrosion inhibitor of the present invention, concrete operation process comprises the following steps:

[0030] Step 1. Add the main component raw materials of the corrosion inhibitor and boric acid into the three-necked flask in proportion, heat and stir with the electric heating mantle, and raise the temperature to 40°C-50°C, then add xylene in proportion to obtain the mixture I;

[0031] Step 2. When the temperature of the electric heating mantle rises to 100-120°C, use a constant pressure dropping funnel to add diethylenetriamine drop by drop to the mixture I for reaction, and continue to heat up to 160-180°C for amidation dehydration reaction , and then cyclization reaction at 240-260°C for 3-3.5 hours to obtain imidazoline oil-soluble corrosion inhibitor;

[0032] In step 2, diethylenetriamine is added, and the reaction time is 0.5-1 h.

[0033] The amidation dehydration reaction time in step 2...

Embodiment 1

[0038] An oleic acid imidazoline quaternary ammonium salt corrosion inhibitor, raw materials include oleic acid, diethylenetriamine, boric acid, xylene, and benzyl chloride. Among them, the molar ratio between oleic acid, diethylenetriamine, and benzyl chloride is 1:1:4 respectively, the molar ratio of boric acid and the main component raw material of corrosion inhibitor is 1:0.015, and the main component raw material of xylene and corrosion inhibitor The molar ratio is 1:0.8.

[0039] The preparation process is as follows:

[0040] Step 1. Add oleic acid and boric acid into a three-necked flask in proportion, heat and stir with an electric heating mantle, gradually raise the temperature to 40°C, and then add xylene to obtain mixture I;

[0041] Step 2. When the temperature of the electric heating mantle rises to 120°C, use a constant pressure dropping funnel to add diethylenetriamine dropwise to the mixture I. After reacting for 0.5h, continue to heat up to 170°C, and the am...

Embodiment 2

[0044] A benzoic acid imidazoline quaternary ammonium salt corrosion inhibitor, raw materials include benzoic acid, diethylenetriamine, boric acid, xylene, benzyl chloride. Among them, the ratio of the amount of benzoic acid, diethylenetriamine, and benzyl chloride is 1:1.05:4.5, the molar ratio of boric acid to the main component of the corrosion inhibitor is 1:0.02, and the ratio of xylene to the main component of the corrosion inhibitor is 1:0.02. The molar ratio is 1:1.

[0045] Step 1. Add benzoic acid and boric acid into a three-necked flask in proportion, heat and stir with an electric heating mantle, gradually raise the temperature to 45°C, and then add xylene to obtain mixture I;

[0046] Step 2. When the temperature of the electric heating mantle rises to 110°C, use a constant pressure dropping funnel to add diethylenetriamine dropwise to the mixture I. After reacting for 0.8h, continue to heat up to 160°C, and the amidation reaction occurs. After 3 hours, the cycli...

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Abstract

The invention discloses an imidazoline quaternary ammonium salt corrosion inhibitor which is prepared from the following preparation raw materials including a corrosion inhibitor main component raw material and an additive raw material; the corrosion inhibitor main component raw material is one of oleic acid, benzoic acid, fatty acid, lauric acid and natural eleostearic acid; and the additive rawmaterial includes diethylenetriamine, dimethyl sulfate or benzyl chloride, boric acid and xylene. The invention also discloses a preparation method of the imidazoline quaternary ammonium salt corrosion inhibitor and aims at solving the problem of poor corrosion inhibition performance of the existing corrosion inhibitor in an acid medium. The preparation method is simple, is liable to operate and can perform recovery utilization on a solvent. An imidazoline corrosion inhibitor has the advantages of low toxicity, high slow release efficiency and wide use range. Physical characterization and performance test results of the corrosion inhibitor show that oleic acid imidazoline quaternary ammonium salt has better slow release performance, and the slow release performance of the benzyl chloride is better than the slow release performance of the dimethyl sulfate after being quaternized. A polarization curve test shows that synthesized corrosion inhibitors are all cathodal depression type corrosion inhibitors.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion and protection, relates to an imidazoline quaternary ammonium salt corrosion inhibitor, and also relates to a preparation method of the corrosion inhibitor. Background technique [0002] Metal corrosion has caused huge losses to the national economy, and its annual losses have accounted for 1.5%-4% of the national economy. For this reason, researchers from various countries have conducted a lot of research on metal anti-corrosion technology, such as reasonable material selection, metal surface protection, electrochemical protection, etc. Corrosion inhibitors are widely used in petroleum, chemical industry, metallurgy, machinery, transportation and national defense industries due to their good slow-release effect, wide application range and low cost. The imidazoline corrosion inhibitor has the characteristics of low toxicity, environmental protection and greenness. The heteroatoms N, O, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/61C23F11/14
CPCC07D233/61C23F11/149
Inventor 高晓明刘利波聂卫付峰高楼军
Owner YANAN UNIV
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