Corrosion inhibitor and preparation method

A technology of corrosion inhibitor and solvent, which is applied in the field of water-soluble corrosion inhibitor and its preparation, can solve the problems of corrosion inhibitor corrosion and achieve good corrosion inhibition performance

Inactive Publication Date: 2011-11-09
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO in acidic media 2 Corrosion, a lot of work has been done at home and abroad, and many high-efficiency corrosion inhibitors have been studied, but there is no effective corrosion inhibitor suitable for CO in near-neutral oilfield water systems (pH 5-6.8). 2 corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare the corrosion inhibitor according to the following steps:

[0019] Lauric acid and tetraethylenepentamine were reacted at 160°C for 3 hours, cooled to 50°C; added carbon disulfide, reacted at 40°C for 2 hours, added formaldehyde, stirred until no longer exothermic, added phosphorous acid, and heated to 80°C React for 1 hour to prepare modified imidazoline derivatives; wherein, the molar ratio of lauric acid, tetraethylenepentamine, carbon disulfide, formaldehyde and phosphorous acid is 1:1:1:1:0.5.

[0020] Add modified imidazoline derivatives, 1,4-butynediol, thiourea, sodium dodecylbenzenesulfonate, and urotropine to isopropyl in a mass ratio of 20:2:12:5:4 Among the alcohols, the mass content of isopropanol was 57%, and the corrosion inhibitor product A was obtained after stirring.

Embodiment 2

[0022] Prepare the corrosion inhibitor according to the following steps:

[0023] Lauric acid and polyethylene polyamine were reacted at 230°C for 5 hours, cooled to 60°C; added carbon disulfide, reacted at 70°C for 4 hours, added formaldehyde, stirred until no longer exothermic, added phosphorous acid, and heated to 90°C React for 2 hours to prepare modified imidazoline derivatives; wherein, the molar ratio of lauric acid, polyethylene polyamine, carbon disulfide, formaldehyde and phosphorous acid is 1:1.1:1:2:2.

[0024] Add modified imidazoline derivatives, 1,4-butynediol, thiourea, sodium dodecylbenzenesulfonate, and urotropine into water at a mass ratio of 50:1:1:1:2, and the water The mass content is 45%, and the corrosion inhibitor product B is obtained after stirring.

Embodiment 3

[0026] Prepare the corrosion inhibitor according to the following steps:

[0027] Oleic acid and polyethylene polyamine were reacted at 200°C for 4 hours, cooled to 55°C; added carbon disulfide, reacted at 60°C for 3 hours, added formaldehyde, stirred until no longer exothermic, added phosphorous acid, and heated to 85°C After reacting for 1.5 hours, a modified imidazoline derivative was obtained; wherein, the molar ratio of oleic acid, polyethylene polyamine, carbon disulfide, formaldehyde, and phosphorous acid was 1:1.05:1:1.5:1.

[0028] Add modified imidazoline derivatives, 1,4-butynediol, thiourea, sodium dodecylbenzenesulfonate, and urotropine to isopropanol in a mass ratio of 36:1.5:6.5:3:3 Among them, the mass content of isopropanol is 50%, and the corrosion inhibitor product C is obtained after stirring.

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PUM

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Abstract

The invention discloses a corrosion inhibitor, comprising the following ingredients: modified imidazoline derivative, 1,4-butynediol, thiourea, sodium dodecyl benzene sulfonate, urotropine and solvent, wherein, the weight ratio of modified imidazoline derivative to 1,4-butynediol to thiourea to sodium dodecyl benzene sulfonate to urotropine is (20-50):(1-2):(1-12):(1-5):(2-4), and the quality of the solvent accounts for 30-70% of the total mass of the corrosion inhibitor. The invention also discloses a preparation method of the corrosion inhibitor, comprising the following steps: adding the modified imidazoline derivative, 1,4-butynediol, thiourea, sodium dodecyl benzene sulfonate, urotropine in the solvent, stirring uniformly to obtain the corrosion inhibitor. The corrosion inhibitor disclosed in the invention has good corrosion inhibition effect for CO2 corrosion in the near neutral oil field water system (PH value: 5-6.8).

Description

technical field [0001] The invention relates to the field of corrosion inhibitors, in particular to a CO 2 Water-soluble corrosion inhibitors for corrosion and methods for their preparation. Background technique [0002] During oil and gas extraction and transportation, CO 2 It often exists in oil and gas as a component of natural gas or petroleum-associated gas, plus CO 2 With the extensive application of oil flooding and recovery technology, various metal equipment and pipelines have been subjected to severe acid corrosion, resulting in deterioration of material performance and shortened life of equipment, resulting in huge economic losses. In addition, corrosion often leads to casualties and serious environmental pollution. It is estimated that 30% to 40% of corrosion loss can be recovered if anti-corrosion technology is fully applied. Therefore, strengthening the research on corrosion and protection can bring huge economic benefits to the petroleum industry. Current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54
Inventor 付朝阳何金杯
Owner HUAZHONG UNIV OF SCI & TECH
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