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Cinnamyl imidazoline derivative, preparation and application thereof

A technology of cinnamyl imidazoline and cinnamyl imidazoline is applied in the fields of cinnamyl imidazoline derivatives and their preparation and application, which can solve the problems of environmental damage, high toxicity and the like, and achieve the effects of small dosage, low toxicity and high efficiency

Inactive Publication Date: 2013-05-15
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used corrosion inhibitors include inorganic salts, organic amines, imidazolines and quaternary ammonium salts, among which inorganic salts are more toxic, and some phosphorus-containing compounds are likely to cause eutrophication of water bodies and cause damage to the environment. Based on the principle of environmental protection, it is imminent to develop environmentally friendly corrosion inhibitors

Method used

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  • Cinnamyl imidazoline derivative, preparation and application thereof
  • Cinnamyl imidazoline derivative, preparation and application thereof
  • Cinnamyl imidazoline derivative, preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The preparation method of cinnamyl imidazoline:

[0021] Take ethylenediamine and heat it up to 130-140°C, add 6mL of xylene dropwise, and add cinnamic acid, stir evenly and pass in nitrogen; after mixing evenly, heat up to 170-180°C, react for 5-6h, and then heat up again , when the temperature rises to 200-220 ° C for cyclization and dehydration for 3-4 hours; after cyclization, dry to obtain a brown viscous cinnamyl imidazoline derivative; the ratio of cinnamic acid to ethylenediamine is 1: 1.6.

[0022]

[0023] The infrared spectrogram data is as follows: 3290cm -1 It is the stretching vibration peak of -N-H, 3029cm -1 The =C-H stretching vibration peak of the benzene ring appeared at 2900cm -1 At -C-H stretching vibration peak, 1600cm -1 The -C=N double bond absorption peak is the characteristic absorption peak of imidazoline at 1650cm -1 and 1570cm -1 The absorption peak is the by-product amide, which shows that the synthetic product is a mixture of imid...

Embodiment 2

[0039] Conditions: The experimental material is Q235A carbon steel. Dissolve the cinnamyl imidazoline obtained above in seawater and disperse it with ultrasonic waves for 20 minutes to obtain a corrosion inhibitor. The concentration of cinnamyl imidazoline in the sustained release agent is 200 mg / L. Then the Q235A carbon steel was immersed in the above slow-release agent at a temperature of 15°C, and the experiment period was 24h. The corrosion inhibition efficiency obtained through the experimental test is: 89.73% in the weight loss test and 88.80% in the dynamic potential polarization, which shows that it is a corrosion inhibitor with low dosage and high efficiency.

Embodiment 3

[0041] Conditions: The experimental material is Q235A carbon steel. The cinnamyl imidazoline obtained above was dissolved in seawater and dispersed by ultrasonic wave for 20 minutes to obtain a corrosion inhibitor. The concentration of cinnamyl imidazoline in the sustained release agent was 400 mg / L. Then the Q235A carbon steel was immersed in the above slow-release agent at a temperature of 15°C, and the experiment period was 24h. The corrosion inhibition efficiency obtained through the experimental test is: 91.13% in the weight loss test and 89.48% in the dynamic potential polarization, showing that it is a corrosion inhibitor with low dosage and high efficiency.

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Abstract

The invention relates to a pickling corrosion inhibitor for inhibiting corrosion of carbon steel, concretely to a cinnamyl imidazoline derivative, a preparation and an application thereof. The cinnamyl imidazoline derivative is 2-styryl imidazoline with a structural formula as shown in the specification. The cinnamyl imidazoline derivative can be used as the corrosion inhibitor of the carbon steel. The corrosion inhibitor provided by the invention is simple to produce, low in cost, little in toxicity and high in corrosion inhibition rate, can effectively inhibit corrosion and damage of pickling solutions or hydrochloric acid on the carbon steel, and has a wide application prospect.

Description

technical field [0001] The invention relates to a pickling corrosion inhibitor for inhibiting carbon steel corrosion, in particular to a cinnamyl imidazoline derivative and its preparation and application. Background technique [0002] The oil-water mixture produced in oil and gas fields has complex components, mainly containing salts, carbon dioxide, and hydrogen sulfide. The inorganic salts in the water phase gradually deposit on the pipe wall over time, forming mixed salt scale and blocking the pipe. In response to the above problems, oil fields generally use pickling for descaling. The pickling solution is a mixture of hydrochloric acid and hydrofluoric acid in a certain proportion. During the pickling process, the pipeline is inevitably corroded by the acid solution. In order to reduce the damage to the metal material, the method of adding a corrosion inhibitor is generally used. [0003] Currently commonly used corrosion inhibitors include inorganic salts, organic ami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/06C23G1/06
Inventor 李言涛王路遥
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI