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A kind of high temperature resistant bis-imidazoline amide corrosion inhibitor and preparation method thereof

A technology of bisimidazoline amide and corrosion inhibitor, which is applied in the field of high temperature resistant bisimidazoline amide corrosion inhibitor and its preparation, can solve the problem of poor corrosion inhibition performance of non-phosphorus-based corrosion inhibitor, catalyst poisoning, imidazoline decomposition, etc. problem, to achieve the effect of good corrosion inhibition effect, stable performance and easy availability of raw materials

Active Publication Date: 2018-08-17
陕西日新石油化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphorus-based corrosion inhibitors are added in a small amount and have good corrosion inhibition performance, but phosphorus-containing corrosion inhibitors have been proven to have problems with catalyst poisoning and pipeline blockage
The development of non-phosphorus corrosion inhibitors is relatively slow due to poor corrosion inhibition performance
Imidazoline derivatives are environmentally friendly corrosion inhibitors, which show good corrosion inhibition performance at low temperatures, but imidazolines are not effective at high temperatures, and imidazolines will decompose above 250 °C
Domestic CN 1869287A, CN 102650061A, CN102559263A patents use phosphorothioate, phosphoric acid ester and thiophene compounds to modify imidazoline, which effectively improves the stability and corrosion inhibition performance of imidazoline products under high temperature conditions, but the products introduce phosphorus , sulfur compounds, catalyst poisoning of follow-up devices and corrosion of equipment pipelines in high-temperature parts cannot be completely solved

Method used

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  • A kind of high temperature resistant bis-imidazoline amide corrosion inhibitor and preparation method thereof
  • A kind of high temperature resistant bis-imidazoline amide corrosion inhibitor and preparation method thereof
  • A kind of high temperature resistant bis-imidazoline amide corrosion inhibitor and preparation method thereof

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preparation example Construction

[0038] The preparation method of this high temperature resistant bis-imidazoline amide corrosion inhibitor is:

[0039] Step 1, the preparation of two imidazoline amides

[0040] Add fatty acid to xylene A (used as solvent), slowly add polyethylene polyamine under stirring condition, stir evenly, then heat to 120-160°C for 1-2 hours, dehydrate to produce amides, and then heat up to 220-220°C React at 270°C for 1-2 hours for cyclization reaction to generate imidazoline, then cool down naturally to 90-130°C, then add catalyst, xylene B (used as water-carrying agent) and alkenyl succinic acid, and heat to 150-180°C React for 2 to 4 hours to generate bis-imidazoline amide, naturally cool down to 50-60°C, filter the catalyst, and obtain a bis-imidazoline amide solution containing xylene, wherein the content of xylene is 2% to 5%; the above process All carried out under stirring conditions;

[0041] The specific structural formula of the bis-imidazoline amide obtained in above-men...

Embodiment 1

[0050] Step 1, the preparation of two imidazoline amides

[0051] Add 90g of oleic acid and 90g of xylene A into a 500mL four-necked bottle equipped with a stirrer, condenser, water separator, and thermometer, start the stirrer, slowly add 50g of triethylenetetramine, and stir evenly, wherein oleic acid and The molar ratio of triethylenetetramine is 1:1.05; then heated to 150°C, water and xylene are separated, and after 1 hour of reaction until no more water and xylene are separated, the temperature is gradually raised to 270°C, and after 2 hours of reaction, Until water and xylene are no longer separated, oleic acid-based imidazoline is generated, then naturally cool down to 90°C, add 10g of aluminum oxide, 53g of xylene B and 80g of dodecenylsuccinic acid, and heat to 180°C for reaction After 4 hours, until no more water and xylene are released, bis-imidazoline amide is formed, the temperature is naturally lowered to 50-60°C, and the catalyst is filtered off to obtain a bis-...

Embodiment 2

[0056] Add 65g of naphthenic acid and 65g of xylene A into a 500mL four-neck bottle equipped with a stirrer, condenser, water separator, and thermometer, start the stirrer, slowly add 85g of triethylenetetramine, and stir evenly, wherein the naphthene The molar ratio of acid to triethylenetetramine is 1:1.15; then heated to 120°C, water and xylene are separated, and after 1.5 hours of reaction until no more water and xylene are separated, the temperature is gradually raised to 250°C, and the reaction After 1.2h, until no more water and xylene were separated, naphthenic acid-based imidazoline was generated, and then the temperature was naturally lowered to 100°C, and 10g of titanium oxide, 45g of xylene B and 90g of tetradecenylsuccinic acid were added. Heat to 160°C and react for 3 hours until no more water and xylene are released to form bis-imidazoline amide, naturally cool down to 50-60°C, filter the catalyst to obtain a bis-imidazoline amide solution containing a small amou...

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Abstract

The invention provides a bis-imidazoline amide corrosive inhibitor resistant to high temperature. The bis-imidazoline amide corrosive inhibitor resistant to the high temperature is composed of 30%-60% of bis-imidazoline amide, 5%-10% of fatty acid amide, 5%-10% of alkenyl succinimide and 30%-55% of an aromatic solvent. A preparation method of the bis-imidazoline amide corrosive inhibitor resistant to the high temperature comprises the following steps that fatty acid is added to xylene, polyethylene polyamine is added, the mixture is heated to 120-160 DEG C to perform a reaction for 1-2 hours, the mixture is heated again to 220-270 DEG C to perform a reaction for 1-2 hours, the temperature is then cooled to 90-130 DEG C, a catalyst, the xylene and alkenyl succinic acid are added, the mixture is heated to 150-180 DEG C to perform a reaction for 2-4 hours, the catalyst is then filtered out, and then a bis-imidazoline amide solution is obtained; and finally, the bis-imidazoline amide solution is added to the aromatic solvent, the fatty acid amide and the alkenyl succinimide are sequentially added to the aromatic solvent, and then the bis-imidazoline amide corrosive inhibitor is obtained. According to the bis-imidazoline amide corrosive inhibitor resistant to the high temperature, the corrosion inhibiting rate reaches 70% or over at the high temperature of 300 DEG C, the performance is stable, raw materials are low in price and easy to obtain, and the cost is low.

Description

technical field [0001] The invention belongs to the field of chemical additives for high-temperature anticorrosion of metal materials, and relates to a high-temperature-resistant bisimidazoline amide corrosion inhibitor and a preparation method thereof. Background technique [0002] In recent years, the rapid development of the oil refining industry has promoted the extraction and refining of acid- and sulfur-containing crude oil, making the corrosion of high-temperature parts of oil refining units one of the important problems of refinery corrosion. The corrosion of oil refining equipment intensifies as the fluid heats up. High-temperature corrosion occurs in high-temperature parts above 250°C, mainly chemical corrosion, because crude oil and oil products contain corrosive substances such as sulfides and naphthenic acids. . The most corrosive naphthenic acid in crude oil accounts for more than 90% of the total organic acids in crude oil, and is a typical monocarboxylic aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14C07D233/26
CPCC07D233/26C23F11/145
Inventor 刘瑜王蕊孙彦武李飞阳
Owner 陕西日新石油化工有限公司