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Water-soluble imidazoline amide corrosion inhibitor, preparation method thereof and using method thereof

An imidazoline amide, water-soluble technology, applied in the corrosion inhibitor field of oil refining process, can solve the problems of increased risk, high cost, unfavorable neutralizer addition, etc., and achieve the effect of corrosion inhibition, low cost and safe use

Inactive Publication Date: 2010-05-12
SHENYANG POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional imidazoline corrosion inhibitors are oil-soluble, and their disadvantages are: (1) the use of oil-soluble corrosion inhibitors requires oil as a solvent, which increases the risk; (2) the cost of using oil as a solvent is high; (3) The use of oil-soluble corrosion inhibitors is not conducive to the addition of neutralizers

Method used

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  • Water-soluble imidazoline amide corrosion inhibitor, preparation method thereof and using method thereof
  • Water-soluble imidazoline amide corrosion inhibitor, preparation method thereof and using method thereof
  • Water-soluble imidazoline amide corrosion inhibitor, preparation method thereof and using method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The process steps for the preparation of the water-soluble imidazoline amide corrosion inhibitor are as follows.

[0043] (1) Synthesis of water-soluble imidazoline amide

[0044] Polyethylene polyamine, glacial acetic acid and fatty acid are used as raw materials, and the ratio of raw materials is as follows:

[0045] Polyethylene polyamine 40%, glacial acetic acid 40%, fatty acid 20%.

[0046] Among them, the polyethylene polyamine is pentaethylene hexamine, and the fatty acid is nonanoic acid.

[0047] Toluene is used as a solvent, polyvinyl polyamine, glacial acetic acid and fatty acid are sequentially added to the solvent, the three raw materials are dissolved in toluene, and the amidation reaction is carried out at a temperature of 125°C for 3 hours, and the obtained product is under normal pressure, Under the condition of 220°C, the ring-closing reaction was carried out for 3 hours, and at the same time, the toluene was distilled off to obtain a water-soluble i...

Embodiment 2

[0071] The process steps for the preparation of the water-soluble imidazoline amide corrosion inhibitor are as follows.

[0072] (1) Synthesis of water-soluble imidazoline amide

[0073] Polyethylene polyamine, glacial acetic acid and fatty acid are used as raw materials, and the ratio of raw materials is as follows:

[0074] Polyethylene polyamine 50%, glacial acetic acid 20%, fatty acid 30%.

[0075] Among them, the polyethylene polyamine is diethylene triamine, and the fatty acid is oleic acid.

[0076] Using toluene as a solvent, add polyvinyl polyamine, glacial acetic acid and fatty acid to the solvent in turn, dissolve the three raw materials in toluene, and carry out amidation reaction at a temperature of 140°C for 2 hours, and the obtained product is under normal pressure, Under the condition of 240°C, the ring-closing reaction was carried out for 2 hours, and the toluene was distilled off at the same time to obtain the water-soluble imidazoline amide.

[0077] (2) ...

Embodiment 3

[0088] The process steps for the preparation of the water-soluble imidazoline amide corrosion inhibitor are as follows.

[0089] (1) Synthesis of water-soluble imidazoline amide

[0090] Polyethylene polyamine, glacial acetic acid and fatty acid are used as raw materials, and the ratio of raw materials is as follows:

[0091] Polyethylene polyamine 45%, glacial acetic acid 45%, fatty acid 10%.

[0092] Among them, the polyethylene polyamine is nonaethylene decaamine, and the fatty acid is naphthenic acid.

[0093] Using toluene as a solvent, add polyvinyl polyamine, glacial acetic acid and fatty acid to the solvent in sequence, dissolve the three raw materials in toluene, and carry out amidation reaction at a temperature of 110°C for 5 hours, and the obtained product is under normal pressure, Under the condition of 200°C, the ring-closing reaction was carried out for 5 hours, and at the same time, the toluene was distilled off to obtain a water-soluble imidazoline amide.

...

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Abstract

The invention provides a water-soluble imidazoline amide corrosion inhibitor, a preparation method thereof and a using method thereof, and belongs to the technical field of oil refining. The corrosion inhibitor consists of the following components in percentage by mass: 10 to 30 percent of water-soluble imidazoline amide, 0 to 15 percent of ethylene diamine, 0 to 20 percent of ammonia water with a mass concentration of 25 to 28 percent, 0 to 20 percent of ethanol and 40 to 90 percent of water, wherein the water-soluble imidazoline amide is prepared by the amidation reaction and the ring-closing reaction of polyethylene polyamines, glacial acetic acid and fatty acid serving as raw materials and toluene serving a solvent. When the corrosion inhibitor is continuously added to the top part of a primary distillation tower, the top part of a atmospheric distillation tower, the top part of a vacuum distillation tower or the top part of a hydrogenation fractional distillation tower of an oil refinery, the corrosion of a HCL-H2S-H2O medium on the top part of the tower is inhibited, and simultaneously, the quality of products on the top part of the tower is not affected. In the method for preparing the corrosion inhibitor, water is used as the solvent, so that the method has the advantages of being safely used, having low cost and facilitating the addition of a neutralizing agent.

Description

technical field [0001] The invention belongs to the technical field of petroleum refining, and in particular relates to the corrosion inhibitor technology of the refining process. Background technique [0002] Since metal corrosion is a public nuisance, it shortens the life of equipment and leads to one of the main reasons for production shutdown and environmental pollution. In modern industry, especially in the oil and gas industry, it is often an extremely serious destructive factor. Therefore, people have been seeking various ways to minimize metal corrosion for a long time, and the application of corrosion inhibitors has become a very important anti-corrosion method. . Imidazoline corrosion inhibitors are research hotspots in recent years and are widely used in petrochemical, pickling and derusting, oil well acidizing and other industries. This kind of corrosion inhibitor is friendly to the environment, the raw materials are easy to get, high efficiency and low toxicit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/02C07D233/16
Inventor 刘公召顾齐欣
Owner SHENYANG POLYTECHNIC UNIV
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