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Functional quinoline liquid corrosion inhibitor, preparation method and application

A quinoline and corrosion inhibitor technology, applied in the field of preparation and functionalized quinoline liquid corrosion inhibitor, achieves the effects of simple operation, simple processing and low vapor pressure

Inactive Publication Date: 2019-02-05
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some common imidazole-based ionic liquids have been reported, there are few reports on quinoline-based ionic liquids as corrosion inhibitors

Method used

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  • Functional quinoline liquid corrosion inhibitor, preparation method and application
  • Functional quinoline liquid corrosion inhibitor, preparation method and application
  • Functional quinoline liquid corrosion inhibitor, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The structural formula of 1-butylquinoline hydrogen sulfate ionic liquid is:

[0023]

[0024] Preparation Process:

[0025] Add 0.1 mol of quinoline to a 100 mL three-necked flask, add 0.1 mol of n-butane bromide to the three-necked flask at room temperature, stir for 10 minutes after the addition is complete, and react under reflux for 22 hours. The reaction solution is cooled and washed with 10 mL of ether to obtain a sticky solution. Thick substance, namely quinoline ionic liquid functionalized with n-butyl group. Then add 20 mL of dichloromethane to the three-necked flask, maintain the temperature of the system below 5°C, add 0.06 mol of concentrated sulfuric acid dropwise, and after the dropwise addition is completed, heat and stir to reflux for 21 hours. The dichloromethane was evaporated at elevated temperature, and the product was washed with 10 mL of ether after cooling. After the ether was separated and removed, 1-butylquinoline hydrogen sulfate ionic liquid (for...

Embodiment 2

[0027] The structural formula of 1-butylquinoline sulfate ionic liquid is:

[0028]

[0029] Add 0.1 mol of quinoline to a 100 mL three-necked flask, add 0.1 mol of n-butane bromide to the three-necked flask at room temperature, stir for 10 minutes after the addition is complete, and react under reflux for 22 hours. The reaction solution is cooled and washed with 10 mL of ether to obtain a sticky solution. Thick substance, namely quinoline ionic liquid functionalized with n-butyl group. After that, 20 mL of dichloromethane was added to the three-necked flask to maintain the temperature of the system below 5° C., 0.03 mol of concentrated sulfuric acid was added dropwise, and after the addition was completed, the mixture was heated, stirred and refluxed for 21 hours. The dichloromethane was evaporated at elevated temperature, and the product was washed with 10 mL of ether after cooling. After separating and removing the ether, the 1-butylquinoline sulfate ionic liquid (formula II) ...

Embodiment 3

[0031] The most intuitive and easiest way to evaluate corrosion inhibition performance is to compare the weight of steel sheets before and after corrosion by the weightless method (static coupon test). Then through a series of data inference to get the final corrosion inhibition efficiency. Therefore, we took 1-butylquinoline hydrogen sulfate ionic liquid as an example to study its corrosion inhibition performance on low carbon steel in 1 mol / L hydrochloric acid solution.

[0032] We first evaluated the inhibitory rate of (formula I) ionic liquids of different concentrations in 1 mol / L hydrochloric acid solution at 30°C on the corrosion of steel sheets by hydrochloric acid. The experimental data is shown in Table 1-1:

[0033] Table 1-1 (Formula I) Corrosion Inhibition Performance of Ionic Liquid in 1mol / L Hydrochloric Acid at 30℃

[0034]

[0035] From the data in Table 1-1, we can see that, compared with blank hydrochloric acid, the addition of 1-butylquinoline hydrogen sulfate i...

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Abstract

The invention discloses a functional quinoline liquid corrosion inhibitor, a preparation method and application. The functional quinoline liquid corrosion inhibitor is liquid at normal temperature, and is composed of N-butyl quinoline quaternary ammonium positive ions and hydrogen sulfate radicals or sulfate radical negative ions. The ionic liquid is easy to prepare and small in pollution, treatment is easy after a reaction, and environmental friendliness is achieved. It is found through a static coupon experiment that the corrosion inhibition function of the ionic liquid on low-carbon steel in a 1 mol / L HCl solution is remarkable.

Description

Technical field [0001] The invention belongs to the technical field of functional materials, and specifically relates to a functionalized quinoline liquid corrosion inhibitor, a preparation method and an application. Background technique [0002] Steel is widely used in many fields due to its reasonable production cost and appropriate mechanical strength. For example, it is suitable for the manufacture of automobile, tractor and general machinery manufacturing parts such as handbrake shoes, lever shafts, etc. Gear and ship preparation, etc. However, the corrosion of steel in acidic media often causes huge economic losses to human production and life, so it is of great significance to study the corrosion of metals in acidic media. Corrosion is universal, concealed, gradual and sudden, etc. It can be temporarily controlled, but it cannot be completely eliminated. Therefore, an extremely important means to prevent corrosion is to take protective measures. Adding corrosion inhibit...

Claims

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Application Information

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IPC IPC(8): C23F11/04C07D215/10
CPCC07D215/10C23F11/04
Inventor 康丽琴张铭津
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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