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Metal corrosion inhibitor and preparation method thereof

A metal corrosion inhibitor and corrosion inhibitor technology, applied in the direction of organic chemistry, can solve the problem of not seeing CO2 gas-liquid two-phase corrosion inhibitor, so as to reduce the wetting angle, improve the utilization rate, strength and compactness Improved effect

Pending Publication Date: 2021-02-09
盘锦天诚源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far natural gas CO 2 Among the corrosion inhibitors for practical application of anticorrosion, no CO2 gas-liquid two-phase corrosion inhibitor that can have or meet the above-mentioned various performance indicators at the same time has been seen.

Method used

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  • Metal corrosion inhibitor and preparation method thereof
  • Metal corrosion inhibitor and preparation method thereof
  • Metal corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of 2-ethylthiazamide ethylbenzyl-1-heptadecenyl imidazoline quaternary ammonium salt

[0039] Cis-octadec-9-enoic acid and triethylenetetramine were amidated at 130°C for 1 hour at a molar ratio of 1:0.55, and then cyclized at 250°C for 7 hours, and then 2 times the mole of benzyl chloride was added, quaternization reaction at 100°C for 3 hours, and finally add equimolar ethyl disulfide nitrogen at 100°C for 1 hour to obtain natural gas storage CO 2 The liquid phase corrosion inhibitor in the gas-liquid two-phase corrosion inhibitor is 2-ethylthiazamide ethylbenzyl-1-heptadecenyl imidazoline quaternary ammonium salt.

Embodiment 2

[0041] Preparation of quaternary ammonium salt of 2-ethylxanthogenoamine ethylbenzyl-1-methylimidazoline

[0042] Acetic acid and triethylenetetramine were amidated at 120°C for 1 hour at a molar ratio of 1:0.5, then cyclized at 220°C for 6 hours, and then 2 times the mole of benzyl chloride was added, and the quaternization reaction was carried out at 100°C for 2.5 hours. Finally, equimolar ethylsulfonate was added to react at 100°C for 1 hour to obtain the gas phase corrosion inhibitor 2-ethylsulfonate amine ethylbenzyl-1-methyl in the CO2 gas-liquid two-phase corrosion inhibitor of natural gas storage imidazoline quaternary ammonium salt.

Embodiment 3

[0044] Determination of corrosion inhibition rate by static weight loss method (liquid phase)

[0045] The experimental temperature is 50°C, the CO2 partial pressure is 0.50MPa, the liquid phase salinity is 30000mg / L, and the CO2 2 Liquid-phase corrosion inhibitor 2-Ethylthiazoamine ethylbenzyl-1-heptadecenyl imidazoline quaternary ammonium salt (YX), CO 2 Gas-phase corrosion inhibitor 2-ethylsulfonated aminoethylbenzyl-1-methylimidazoline quaternary ammonium salt (QX), sodium butylsulfonate (DH) combined liquid phase corrosion inhibition experiment, the experimental results are shown in Table 3 .

[0046] Concentration / (mg / L) CR / (mm / a) IE / % 0 0.9214 —— 150 / (QX) 0.2567 72.1 150 (YX) 0.1516 83.5 150 (DH) 0.4918 46.6 60(QX)+100(YX)+30(DH) 0.0456 95.1

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Abstract

The invention discloses a metal corrosion inhibitor and a preparation method thereof. The preparation method comprises the process steps of a natural gas storage CO2 liquid-phase corrosion inhibitor and a natural gas storage CO2 gas-phase corrosion inhibitor. The preparation method of the CO2 liquid-phase corrosion inhibitor for the natural gas storage comprises the following steps: S1, carrying out amidation and cyclization reaction on cis-octadecenoic acid-9-enoic acid and triethylenetetramine serving as main components, and dehydrating twice to form a five-membered heterocyclic imidazolineintermediate; s2, the imidazoline intermediate and benzyl chloride are subjected to quaternization, and oil solubility is converted into water-soluble imidazoline quaternary ammonium salt; and S3, reacting the imidazoline quaternary ammonium salt with ethyl sulfur nitrogen, and introducing an ethyl sulfur nitrogen polar group, so that the imidazoline quaternary ammonium salt has more active adsorption sites to obtain the natural gas storage CO2 liquid-phase corrosion inhibitor 2-ethylthio-amino-ethyl-benzyl-1-heptadecenyl-imidazoline quaternary ammonium salt. The corrosion inhibitor has gas-phase corrosion inhibition and liquid-phase corrosion inhibition functions at the same time, and the use concentration of the corrosion inhibitor can be reduced to a low degree on the premise that the function of the corrosion inhibitor is not affected.

Description

technical field [0001] The invention relates to the technical field of natural gas storage protection, in particular to a metal corrosion inhibitor and a preparation method thereof. Background technique [0002] The pressure and temperature at the bottom of the natural gas storage are high, and water often exists in the form of water vapor. When the natural gas flows from the bottom of the well to the wellhead, its temperature becomes lower and lower until it reaches the dew point of water, and the water in the natural gas It will condense and accumulate on the inner surface of the gas pipeline to form a water film layer. The condensate formed on the pipe wall will also gradually accumulate into liquid water in the lower part of the pipeline. No matter the water film layer on the upper inner surface of the pipeline or the liquid water below the pipeline, there will be a large amount of CO dissolved 2 , will cause corrosion to the pipeline, that is, there is CO in the natur...

Claims

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Application Information

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IPC IPC(8): C07D233/16C07D233/06C23F11/16C23F11/02
CPCC07D233/16C07D233/06C23F11/16C23F11/02C23F11/149C23F11/141
Inventor 金秋才力檀馨悦张雨萌王楚媛吴宪龙宫丽艳
Owner 盘锦天诚源科技有限公司
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