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A technology of carbon dioxide and double quaternary ammonium salt, which is applied in the field of corrosion protection of offshore oil production oil and gas gathering and transportation pipelines, can solve the problems of poor water solubility and achieve good protection effect
Inactive Publication Date: 2016-01-13
CHINA NAT OFFSHORE OIL CORP +1
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[0006] China invented "a composite corrosion inhibitor", application number 201210208767.4 discloses a composite corrosion inhibitor that can inhibit carbon dioxide, sulfide corrosion, salt, bacteria, etc., but still has the problem of poor water solub
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Embodiment 1
[0025] (1) In the ethanol solution in the reactor, add quinoline and epichlorohydrin in a molar ratio of 1.0:1.05 in sequence, slowly add epichlorohydrin dropwise, react for 3 hours under reflux at 85°C, and cool down to 55°C ℃, add tetradecyl dimethyl tertiary amine, and continue to react for 2 hours to obtain a dark red uniform viscous liquid, which is an asymmetric bis-quaternary ammonium salt compound, and set aside;
[0026] (2) Weigh 45% of the asymmetric bis-quaternary ammonium salt compound and 55% of methanol, mix with each other, and stir evenly to obtain the asymmetric bis-quaternary ammonium salt carbon dioxide corrosion inhibitor.
Embodiment 2
[0028] (1) In the ethanol solution in the reactor, add quinoline and epichlorohydrin in a molar ratio of 1.0:1.05 in sequence, slowly add epichlorohydrin dropwise, react for 5 hours under reflux at 85°C, and cool down to 65°C ℃, add hexadecyl dimethyl tertiary amine, and continue to react for 4 hours to obtain a dark red homogeneous viscous liquid, which is an asymmetric bis-quaternary ammonium compound, and set aside;
[0029] (2) Weigh 46% of the asymmetric bis-quaternary ammonium compound and 54% of ethanol, mix with each other, and stir evenly to obtain the asymmetric bis-quaternary ammonium carbon dioxide corrosion inhibitor.
Embodiment 3
[0031] (1) In the ethanol solution in the reactor, add quinoline and epichlorohydrin in a molar ratio of 1.0:1.05 in sequence, slowly add epichlorohydrin dropwise, react for 4 hours under reflux at 85°C, and cool down to 60°C ℃, add octadecyl dimethyl tertiary amine, and continue to react for 3 hours to obtain a dark red uniform viscous liquid, which is an asymmetric bis-quaternary ammonium compound, and set aside;
[0032] (2) Weigh 43% of the asymmetric bis-quaternary ammonium compound and 57% of ethanol, mix with each other, and stir evenly to obtain the asymmetric bis-quaternary ammonium carbon dioxide corrosion inhibitor.
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Abstract
The invention relates to a dissymmetric bis-quaternary ammonium carbon dioxide corrosion inhibitor and a preparation method thereof, and belongs to the technical field of corrosion prevention for oil-gas gathering and transferring pipelines in offshore oil production. The corrosion inhibitor disclosed by the invention is composed of 40-60% of a dissymmetric bis-quaternary ammonium compound, and 40-60% of a low-molecular-weight alcohol solvent. The preparation method thereof comprises the following steps: adding a nitrogen heterocyclic ring compound and epoxy chloropropane with a molar ratio of 1.0: 1.05 in ethanol solution of a reactor, reacting for 3-5 hours under a condition of carrying out reflux at 85 DEG C, cooling to 55-65 DEG C, adding long-chain alkyl tertiary amine, continuing to react for 2-4 hours to obtain the dissymmetric bis-quaternary ammonium compound, then weighing the dissymmetric bis-quaternary ammonium compound and the low-molecular-weight alcohol solvent, and mutually mixing and uniformly stirring the dissymmetric bis-quaternary ammonium compound and the low-molecular-weight alcohol solvent to obtain the dissymmetric bis-quaternary ammonium carbon dioxide corrosion inhibitor. The corrosion inhibitor provided by the invention is capable of being used for corrosion prevention for oil-gas gathering and transferring pipelines in offshore oil production, high in compatibility with the medicaments of a demulsifier and the like, wide in adaptability, and capable of meeting the need of corrosion prevention under complex working conditions on site.
Description
technical field [0001] The invention relates to an asymmetric biquaternary ammonium salt carbon dioxide corrosion inhibitor and a preparation method thereof, and belongs to the technical field of corrosion protection of oil and gas gathering and transportation pipelines in offshore oil production. Background technique [0002] During offshore oil and gas exploitation, CO 2 Corrosion is the most common form of corrosion encountered in the process of oil and gas gathering and transportation, and it is extremely corrosive. CO 2 Aqueous solutions can cause rapid corrosion of metallic materials, leading to early failure of piping equipment. Dosing corrosion inhibitors is a more effective corrosion protection measure. Corrosion inhibitor is a substance that can significantly reduce the corrosion rate of metals when added in a small amount in the corrosive medium. Adding corrosion inhibitors has the advantages of less investment, quick results, and convenience. It is an important...
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