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Cinnamaldehyde-based Schiff base acidizing corrosion inhibitor, and preparation method and using method thereof

A technology of cinnamaldehyde-based Schiff base and cinnamaldehyde-based Schiff base, which can be used in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc. Erosion effect, overcoming the limited use conditions, and the effect of fast reaction rate

Inactive Publication Date: 2019-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The application provides a cinnamaldehyde-based Schiff base acidification corrosion inhibitor, which uses cinnamaldehyde to react with organic diamines or organic triamines to obtain cinnamaldehyde-based Schiff base products, as well as the selected compound, and the obtained cinnamaldehyde-based The alkali acidification corrosion inhibitor not only has excellent corrosion inhibition effect, but also solves the problem that the corrosion inhibitors in the prior art cannot be applied under higher temperature, higher pressure and strong acid liquid system

Method used

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  • Cinnamaldehyde-based Schiff base acidizing corrosion inhibitor, and preparation method and using method thereof
  • Cinnamaldehyde-based Schiff base acidizing corrosion inhibitor, and preparation method and using method thereof
  • Cinnamaldehyde-based Schiff base acidizing corrosion inhibitor, and preparation method and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Weigh 200mmol of cinnamaldehyde and 100mmol of propylenediamine into a 250ml single-necked flask, add 50ml of chlorobenzene, and heat for 6 minutes at a microwave power of 580W. Filter to obtain a yellow solid, which is the reaction product N,N'-bis(3-phenyl-2-propenyl)-1,3-propanediamine; then take 10g of the reaction product N,N'-bis(3-benzene -2-propenyl)-1,3-propanediamine, 5g methoxypropylamine, 2g urotropine, 1g EL80, 30g dimethylformamide, 52g benzyl alcohol and mix well to get the corrosion inhibitor .

[0081] What this embodiment carried out is the mensuration to N80 steel corrosion rate under normal pressure static condition, what test is the corrosion inhibitor of different concentrations in 90 ℃, 15%HCl (weight) solution in the evaluation to N80 steel, and the reaction time is 4 Hours, the specific test and calculation results are shown in Table 3.

[0082] Table 3 Corrosion inhibition efficiency of different corrosion inhibitor concentrations

[0083] ...

Embodiment 2

[0088] Weigh 220mmol of cinnamaldehyde and 100mmol of propylenediamine into a 250ml single-necked flask, add 50ml of o-dichlorobenzene, and heat for 5 minutes with a microwave power of 600W. After the solution is cooled, add a small amount of ether, a large amount of solids are precipitated, and put it in a low-temperature box to cool After suction filtration, a yellow solid was obtained, which was the reaction product N,N'-bis(3-phenyl-2-propenyl)-1,3-propanediamine; then 10g of the reaction product N,N'-bis(3 -Phenyl-2-propenyl)-1,3-propanediamine, 4g methoxypropylamine, 3g urotropine, 3gEL60, 27g dimethyl sulfoxide, 53g isoamyl alcohol can be mixed and stirred evenly to obtain slow etchant.

[0089] In this embodiment, at different temperatures, 15% HCl (weight) acid solution is added with different concentrations of corrosion inhibitors shown in Table 4, and the corrosion rate and corrosion inhibition rate are tested. Among them, the corrosion rate at 30°C to 90°C It was ...

Embodiment 3

[0095] Weigh 200mmol of cinnamaldehyde and 100mmol of propylenediamine into a 250ml single-necked flask, add 50ml of chlorobenzene, and heat for 10 minutes with a microwave power of 550W. Filter to obtain a yellow solid, which is the reaction product N,N'-bis(3-phenyl-2-propenyl)-1,3-propanediamine; then take 10g of the reaction product N,N'-bis(3-benzene Base-2-propenyl)-1,3-propanediamine, 5g methoxypropylamine, 3g urotropine, 2g EL40, 30g dimethyl sulfoxide, and 50g ethanol can be mixed and stirred evenly to obtain a corrosion inhibitor.

[0096] In this example, under the condition of 90°C and 1% corrosion inhibitor concentration in different acid solutions, the N80 steel was evaluated and tested by the normal pressure static method, and the reaction time was 4 hours; Table 5 and Table 1 for comparison, it can be seen that under the condition that the weight percentage of the corrosion inhibitor is 1%, the corrosion rate of N80 steel is increasing with the increase of the ...

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Abstract

The invention provides a cinnamaldehyde-based Schiff base acidizing corrosion inhibitor. The cinnamaldehyde-based Schiff base acidizing corrosion inhibitor comprises 10-15 wt% of a cinnamaldehyde-based Schiff base and 85-90 wt% of a compound; the compound comprises methoxypropylamine, urotropine, a surfactant, a polar aprotic solvent and an alcohol solvent; and the cinnamaldehyde-based Schiff baseis a reaction product of cinnamaldehyde and an organic diamine or organic triamine containing two primary amino groups. The invention further provides a preparation method and a using method of the cinnamaldehyde-based Schiff base acidizing corrosion inhibitor. The corrosion inhibitor is added into an acid liquor to effectively inhibit the corrosion of the acid liquor to the metal surface; the corrosion inhibitor can be suitable for conditions comprising a high temperature of 160 DEG C and an acid liquor concentration reaching 28% or conditions comprising a higher temperature and a strong acid under the condition that the corrosion inhibition effect is met; and the c cinnamaldehyde-based Schiff base acidizing corrosion inhibitor has the characteristics of small dosage, high efficiency, wide use temperature range, good dispersion in the acid liquor and simplicity in production when used for the acid liquor.

Description

technical field [0001] The application relates to the anticorrosion technology of materials in the field of petrochemical industry, in particular to a cinnamaldehyde-based Schiff base acidification corrosion inhibitor, its preparation and use method, and belongs to the technical field of petrochemical industry. Background technique [0002] In order to improve the recovery rate of oil and gas wells and achieve the purpose of increasing and stabilizing production, it is necessary to periodically inject acid liquid into the oil and gas wells for acid treatment to keep the oil and gas channels unobstructed. When the acid liquid is injected into the formation, it can dissolve the blockages in the seepage channels or Manufacture artificial fractures to make oil and gas channels unobstructed, reduce oil flow resistance, and increase formation permeability; however, the injection of acid liquid will cause serious corrosion of oil and gas well tubing and downhole metal equipment, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C09K8/74C23G1/06
CPCC09K8/54C09K8/74C09K2208/32C23G1/06C23G1/068C23F11/146
Inventor 宋文文张娟涛殷泽新谢俊峰李磊
Owner PETROCHINA CO LTD
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