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Preparation method of metal corrosion inhibitor

A metal corrosion inhibitor and fatty acid technology, which is applied in the field of synthesizing new metal corrosion inhibitors, can solve problems such as affecting oil well production, economic loss, well shut-down, etc., and is beneficial to environmental protection, ensuring normal mining, and prolonging replacement cycle. Effect

Active Publication Date: 2011-08-24
大庆高新区华龙祥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, crude oil exploitation in most oilfields in my country has entered the late stage, that is, the stage of tertiary oil recovery. In order to improve the recovery rate, the amount of various oilfield additives has been greatly increased. The corrosion performance of sucker rods and pumps is outstanding, and the replacement of corrosion damage causes well workover and shutdown, which not only seriously affects the production of oil wells, but also causes huge economic losses
[0003] Currently, traditional corrosion inhibitors are mostly used in the market, such as: sulfonate-type corrosion inhibitors and monoimidazoline-type corrosion inhibitors. Although these types of corrosion inhibitors have achieved certain effects, due to the downhole medium , the complexity of the process conditions and the strong corrosiveness of the oil-water medium, the corrosion inhibition rate of traditional corrosion inhibitors has a clear downward trend, and it has been unable to meet the strong corrosiveness of the existing oil-water medium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, the preparation method synthesis steps of metal corrosion inhibitor of the present invention are as follows:

[0015] (a) Amidation reaction:

[0016] Put oleic acid into a reactor equipped with a stirrer and a distillation condensing device. After heating and melting, add diethylenetriamine according to the molar ratio of oleic acid to diethylenetriamine as 1:1, and raise the temperature to 190-205°C for reaction 9h, then lower the temperature to 75°C for 2h;

[0017] (b) Quaternization reaction:

[0018] Heat and melt the amidated product in a reactor, add 30% (w / w) aqueous solution of chloroacetic acid according to the molar ratio of oleic acid to chloroacetic acid of 1:1.2, adjust the pH value to 8-9 with sodium hydroxide, and raise the temperature to 85 React at -90°C for 6 hours;

[0019] (c) Substitution reactions:

[0020] Put the quaternized product into the reactor, and when the temperature rises to 70°C, quickly add dichloroethane with a mol...

Embodiment 2

[0021] Embodiment 2, the preparation method of metal corrosion inhibitor of the present invention Synthetic steps are as follows:

[0022] (a) Amidation reaction:

[0023] Put lauric acid into a reactor equipped with a stirrer and a distillation condensing device. After heating and melting, add diethylenetetramine according to the molar ratio of lauric acid to diethylenetetramine as 1:1.1, and raise the temperature to 160-175°C for reaction 7h, then lower the temperature to 75°C for 2h;

[0024] (b) Quaternization reaction:

[0025] Heat and melt the amidated product in a reactor, add 30% (w / w) aqueous solution of chloroacetic acid according to the molar ratio of lauric acid to chloroacetic acid of 1:1.1, adjust the pH value to 8-9 with sodium hydroxide, and raise the temperature to 85 ℃ reaction 6h;

[0026] (c) Substitution reactions:

[0027] Put the quaternized product into the reactor, and when the temperature rises to 70°C, quickly add dichlorohexane with a molar rat...

Embodiment 3

[0028] Embodiment 3, the preparation method of metal corrosion inhibitor of the present invention Synthetic steps are as follows:

[0029] (a) Amidation reaction:

[0030] Put palmitic acid into a reactor equipped with a stirrer and a distillation condensing device, heat and melt, add diethylenetriamine according to the molar ratio of palmitic acid and diethylenetriamine as 1:1.2, and raise the temperature to 190-200°C for reaction 9h, then lower the temperature to 75°C for 2h;

[0031] (b) Quaternization reaction:

[0032] Heat and melt the amidated product in a reactor, add chloroacetic acid aqueous solution 30% (w / w) according to the molar ratio of palmitic acid and chloroacetic acid at 1:1.2, adjust the pH value to 8-9 with sodium hydroxide, and raise the temperature to 85 React at -90°C for 6 hours;

[0033] (c) Substitution reactions:

[0034] Put the quaternized product into the reactor, and when the temperature rises to 70°C, quickly add dichlorobutane with a molar...

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Abstract

The invention relates to a preparation method of a metal corrosion inhibitor. Fatty acid and polyamine are used as initiative raw materials in the method, and the novel metal corrosion inhibitor is synthesized by amidation, quaternization and substitution reaction. The corrosion inhibition rate of the metal corrosion inhibitor prepared by the method is more than 99 percent, the corrosion inhibitor is easily biodegraded, the pH value of the corrosion inhibitor is 6 to 8 and close to neutrality, and the corrosion inhibitor is convenient to transport and use.

Description

technical field [0001] The invention relates to a preparation method of a metal corrosion inhibitor, in particular to a preparation method for synthesizing a novel metal corrosion inhibitor with fatty acid and polyamine as starting materials. technical background [0002] At present, crude oil exploitation in most oilfields in my country has entered the late stage, that is, the stage of tertiary oil recovery. In order to improve the recovery rate, the amount of various oilfield additives has been greatly increased. The corrosion performance of sucker rods and pumps is outstanding, and the replacement of corrosion damage will cause workover and shutdown, which not only seriously affects the production of oil wells, but also causes huge economic losses. [0003] Currently, traditional corrosion inhibitors are mostly used in the market, such as: sulfonate-type corrosion inhibitors and monoimidazoline-type corrosion inhibitors. Although these types of corrosion inhibitors have ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14
Inventor 孙安顺
Owner 大庆高新区华龙祥化工有限公司
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