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Schiff base type acidification corrosion inhibitor, preparation method and applications thereof

A technology of acidifying corrosion inhibitor and Schiff base, which is applied in the field of metal anti-corrosion, can solve the problems of high toxicity, high cost, and unsatisfactory effect, and achieve the effect of reduced corrosion rate, stable performance, and reliable reaction principle

Inactive Publication Date: 2015-08-12
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal corrosion inhibitors commonly used in oil and gas fields have problems such as high toxicity, high cost and unsatisfactory effect in the process of synthesis and application

Method used

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  • Schiff base type acidification corrosion inhibitor, preparation method and applications thereof
  • Schiff base type acidification corrosion inhibitor, preparation method and applications thereof
  • Schiff base type acidification corrosion inhibitor, preparation method and applications thereof

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preparation example Construction

[0031] Second aspect, the present invention provides the preparation method of described Schiff base type acidification corrosion inhibitor, comprises the steps:

[0032] A. Take thiosemicarbazide and benzaldehyde, or thiosemicarbazide and cinnamaldehyde, or thiosemicarbazide and furfural as the main ingredient of the corrosion inhibitor at a molar ratio of 1.0:1.0 to 2.0. Mix evenly with an organic solvent whose mass is 1.0 to 3.0 times the mass of the main corrosion inhibitor raw material, add an acidic pH regulator to pH = 2 to 4, and react at a temperature of 60 to 90°C for 4 to 10 hours , cooled to obtain the Schiff base compound;

[0033] B. Mix the Schiff base compound obtained in step A with the organic solvent and water uniformly in proportion to prepare the Schiff base type acidification corrosion inhibitor.

[0034] Preferably, the pH regulator is hydrochloric acid or glacial acetic acid.

[0035] In the third aspect, the Schiff base acidification corrosion inhibi...

Embodiment 1

[0038] Mix thiosemicarbazide, benzaldehyde and ethanol into a three-necked flask, then add an acidic pH regulator to pH=2-4, react at 70-80°C for 6 hours, and obtain a Schiff base compound after cooling the system. Wherein the molecular formula of Schiff base compound is:

[0039]

Embodiment 2

[0041] Mix thiosemicarbazide, cinnamaldehyde and ethanol into a three-necked flask, then add an acidic pH regulator to pH=2-4, react at 70-80°C for 5 hours, and the Schiff base compound can be obtained after the system is cooled. Wherein the molecular formula of Schiff base compound is:

[0042]

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Abstract

The present invention provides a Schiff base type acidification corrosion inhibitor, a preparation method and applications thereof. According to the present invention, the preparation method has characteristics of green, low-toxicity and easily-biodegraded synthetic raw material selection, reliable reaction principle and simple production process; the Schiff base type acidification corrosion inhibitor belongs to the adsorption type corrosion inhibitor, can quickly form a compact and firm hydrophobic protection film on the surface of iron and steel so as to effectively prevent corrosion of the acid liquid on iron and steel, and has characteristics of low consumption, good corrosion inhibition effect, and stable performance; and after 0.5-1.0% by mass of the corrosion inhibitor of the present invention is added to the acid liquid, the corrosion rate of the N80 steel sample sheet in the acid liquid can be significantly reduced, the indexes of the petroleum industry standard SY-T5450-1996 grade-one corrosion inhibitor product are met, and the wide application prospects are provided in the oil and gas well operation.

Description

technical field [0001] The invention relates to the field of metal anticorrosion, in particular to a preparation method and application of a Schiff base acidification corrosion inhibitor. Background technique [0002] At present, most oil and gas fields in China need to rely on acidizing technology to treat formations, so as to improve the recovery rate of oil and gas wells and realize the production increase and stable production of oil and gas wells. Therefore, acid fracturing technology is a very effective tool in the development of oil and natural gas resources. measures to increase production. In order to expand the oil flow channel and reduce the oil flow resistance, a certain amount of acid liquid is usually injected into the formation by mechanical means. During the implementation of acid fracturing technology, high-concentration acid liquid will inevitably cause corrosion to metal pipelines, especially when the acid liquid is in a flowing state and the bottom hole ...

Claims

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Application Information

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IPC IPC(8): C23F11/16
CPCC23F11/16C23F11/162
Inventor 李克华
Owner YANGTZE UNIVERSITY