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Synthesis method and application of rosin-based imidazoline derivative corrosion inhibitor

A technology of rosin-based imidazoline and synthesis method, which is applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc. energy and other problems, to achieve the effect of reducing the degree of pitting corrosion, simple preparation method and low energy consumption

Active Publication Date: 2018-11-16
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Imidazolines are usually synthesized by dehydration of long-chain fatty acids or fatty acid methyl esters and polyamines to form five-membered rings. The synthesis process is complex, consumes more energy, and the slow-release performance of corrosion inhibitors is limited.

Method used

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  • Synthesis method and application of rosin-based imidazoline derivative corrosion inhibitor
  • Synthesis method and application of rosin-based imidazoline derivative corrosion inhibitor
  • Synthesis method and application of rosin-based imidazoline derivative corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Preparation of corrosion inhibitor intermediate

[0055] Add dehydroabietic acid, triethylenetetramine and xylene in a molar ratio of 1:1.1:0.8, first add dehydroabietic acid into a dry four-necked bottle equipped with a water separator, and raise the temperature to 220-240°C. Slowly add triethylenetetramine and xylene as water-carrying agents dropwise, react for 3-6 hours; then continue to heat up to 270-280°C, reflux for cyclization reaction for 3-6 hours, and use a water separator to separate water; finally distill out under reduced pressure Xylene, obtains the rosin-based imidazoline derivative corrosion inhibitor intermediate IMDO;

[0056] (2) Mannich reaction

[0057] h 3 PO 3 The molar ratio of intermediate IMDO and formaldehyde is 1:1:2. In an acidic catalytic environment, first add intermediate IMDO and phosphorous acid and heat at reflux at 100-110°C for 1.5-2.5h, then slowly add formaldehyde dropwise with a constant pressure funnel , reflux reaction ...

Embodiment 2

[0059] (1) Preparation of corrosion inhibitor intermediate

[0060] Add dehydroabietic acid, triethylenetetramine and xylene in a molar ratio of 1:1.3:1.1, first add dehydroabietic acid into a dry four-necked bottle equipped with a water separator, and raise the temperature to 220-240°C. Slowly add triethylenetetramine and xylene as water-carrying agents dropwise, react for 3-6 hours; then continue to heat up to 270-280°C, reflux for cyclization reaction for 3-6 hours, and use a water separator to separate water; finally distill out under reduced pressure Xylene, obtains the rosin-based imidazoline derivative corrosion inhibitor intermediate IMDO;

[0061] (2) Mannich reaction

[0062] h 3 PO 3 The molar ratio of intermediate IMDO and formaldehyde is 1:1:2. In an acidic catalytic environment, first add intermediate IMDO and phosphorous acid and heat at reflux at 100-110°C for 1.5-2.5h, then slowly add formaldehyde dropwise with a constant pressure funnel , reflux reaction ...

Embodiment 3

[0064] (1) Preparation of corrosion inhibitor intermediate

[0065] Add dehydroabietic acid, triethylenetetramine and xylene in a molar ratio of 1:1.2:0.9, first add dehydroabietic acid into a dry four-necked bottle equipped with a water separator, and raise the temperature to 220-240°C. Slowly add triethylenetetramine and xylene as water-carrying agents dropwise, react for 3-6 hours; then continue to heat up to 270-280°C, reflux for cyclization reaction for 3-6 hours, and use a water separator to separate water; finally distill out under reduced pressure Xylene, obtains the rosin-based imidazoline derivative corrosion inhibitor intermediate IMDO;

[0066] (2) Mannich reaction

[0067] h 3 PO 3 The molar ratio of intermediate IMDO and formaldehyde is 1:1:2. In an acidic catalytic environment, first add intermediate IMDO and phosphorous acid and heat at reflux at 100-110°C for 1.5-2.5h, then slowly add formaldehyde dropwise with a constant pressure funnel , reflux reaction ...

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Abstract

Relating to synthesis and application of metal anticorrosive compounds, the invention specifically discloses a synthesis method and application of a rosin-based imidazoline derivative corrosion inhibitor. In the synthesis process, triethylene tetramine and dehydroabietic acid are adopted as the raw materials to prepare a rosin-based imidazoline derivative corrosion inhibitor intermediate, then phosphorous acid is employed for Mannich reaction modification on the intermediate so as to obtain the rosin-based imidazoline derivative corrosion inhibitor. Structural characterization of the corrosioninhibitor with infrared spectroscopy and analysis by electrochemical process, dynamic weight loss process, energy spectrum analysis, scanning electron microscope and other methods find that the corrosion inhibitor has a good corrosion inhibition effect on metals, and at the same time adding of the corrosion inhibitor can reduce the corrosion current density and decrease the corrosion rate.

Description

technical field [0001] The invention relates to the technical field of compound synthesis, in particular to a synthesis method and application of a rosin-based imidazoline derivative corrosion inhibitor. Background technique [0002] With the increasing degree of heavy crude oil, the annual output of high-acid crude oil accounts for about 5% of the total crude oil on the earth, and grows at an annual growth rate of 0.3%. The output of high-acid crude oil in my country accounts for about 40% of the total crude oil output. Therefore, The corrosion of oil wells, storage tanks and pipelines in the process of crude oil extraction, and the corrosion of refining equipment in the process of crude oil processing are particularly serious. According to statistics, the economic losses caused by corrosion account for 6% of the total output value of the national economy, especially for the petrochemical industry. [0003] Since the beginning of the 20th century, people have continuously ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6506C23F11/04
CPCC23F11/04
Inventor 程丽华郭文姝王慧朱华平黄敏许江兵谭达刚
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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