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Alkyl pyridinium quaternary ammonium salt corrosion inhibitor used for inhibiting carbon dioxide corrosion and preparation method thereof

An alkylpyridine and carbon dioxide technology, applied in the field of metal corrosion and protection, can solve the problems of poor temperature resistance, general effect, high cost and the like, and achieve the effects of low cost, no three waste pollution, and simple route.

Inactive Publication Date: 2016-05-11
南京华洲新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The most common corrosion inhibitors for carbon dioxide and hydrogen sulfide are imidazolines. Generally, the corrosion inhibitors of imidazolines have poor temperature resistance, and the modified type is not only expensive but also effective. The publication number is CN102071427A. A corrosion inhibitor for inhibiting high-temperature and high-pressure carbon dioxide corrosion and its preparation method. It is mentioned that thioimidazolone derivatives have a better effect on the inhibition of high-temperature and high-pressure carbon dioxide than that of modified imidazolines alone, but they are more toxic than some Large acetylenic alcohol compound, and for carbon dioxide corrosion under high temperature and high pressure, this kind of corrosion inhibitor is still difficult to solve

Method used

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  • Alkyl pyridinium quaternary ammonium salt corrosion inhibitor used for inhibiting carbon dioxide corrosion and preparation method thereof
  • Alkyl pyridinium quaternary ammonium salt corrosion inhibitor used for inhibiting carbon dioxide corrosion and preparation method thereof
  • Alkyl pyridinium quaternary ammonium salt corrosion inhibitor used for inhibiting carbon dioxide corrosion and preparation method thereof

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Embodiment 1

[0029] This embodiment is used to prepare alkylpyridinium quaternary ammonium salt

[0030]

[0031] Wherein, R is H or methyl, and n is 1, 2 or 3.

[0032] The above structural formula is an alkylpyridine, and the composite alkylpyridine used in this embodiment is a combination of all the alkylpyridines listed in the above structural formula.

[0033] Put 180g of compound alkylpyridine and 22g of DMF into the reactor, heat up to 80°C under reflux condensation, start to add 120g of benzyl chloride dropwise, and control the temperature. hour, the temperature was lowered to 100° C., and 78 g of methanol was added dropwise to obtain 400 g of brown complex alkylpyridinium quaternary ammonium salts.

Embodiment 2

[0035] This embodiment is used to prepare benzalkonium chloride

[0036] 220g of dodecylamine was put into the reactor, and the temperature was raised to 70°C. Under the condition of reflux condensation, 120g of benzyl chloride was added dropwise to control the temperature. After the dropwise addition, the temperature was raised to 88° C., the reaction was carried out for 5 hours, the temperature was lowered, and 95 g of a mixed solution of methanol and water (mass ratio 1:1) was added.

Embodiment 3

[0038] This implementation case is used to prepare corrosive medium

[0039] 50gNaCL, 2gMgCL.6H 2 O, 6gNa 2 SO 4 , 4gCaCL 2 , 0.4gNaHCO 3 Add it into 1000g of water, stir to dissolve it completely, and obtain a 5.8% saline solution as a corrosion medium.

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Abstract

The invention discloses an alkyl pyridinium quaternary ammonium salt corrosion inhibitor used for inhibiting carbon dioxide corrosion and a preparation method thereof, and belongs to the technical field of oil field chemicals. The corrosion inhibitor comprises, by weight, composite alkyl pyridinium quaternary ammonium salt, benzalkonium chloride, polyoxyethylene octylphenol ether and / or fatty alcohol-polyoxyethylene ether, thiourea, ethanediol, monoethanolamine and water. The preparation method of the corrosion inhibitor comprises the steps that after being obtained through reactive synthesis of alkyl pyridinium, benzyl chloride, DMF, the ethanediol and the water, the quaternary ammonium salt is compounded with the benzalkonium chloride, the polyoxyethylene octylphenol ether, the fatty alcohol-polyoxyethylene ether, organic solvent, the thiourea, the monoethanolamine and the water. The corrosion inhibitor and the preparation method of the corrosion inhibitor have the advantages that the process route is simple, the synthetic product is free of three-waste pollution, and the cost is low; the raw materials are easy to purchase, and using is convenient.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion and protection, and in particular relates to a preparation method and performance research of an alkylpyridinium quaternary ammonium salt sewage corrosion inhibitor. Background technique [0002] CO 2 It often exists in oil and gas as one of the components of natural gas or oilfield associated gas. In addition, CO 2 The advanced EOR (Enhanced Oil Recovery) crude oil stimulation technology also brings it into the crude oil transmission system. Therefore, CO is widely present in the oil and gas industry. 2 , which is extremely corrosive to steel after being dissolved in water. At the same pH value, due to CO 2 The total acidity of hydrochloric acid is higher than that of hydrochloric acid, so its corrosion of steel is more serious than hydrochloric acid. Corrosion may make the life of oil and gas wells much lower than the design life, and the corrosion rate of low carbon steel is sometime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10
CPCC23F11/10
Inventor 邢华忠陶远贤冷传智吴浩林冬冬
Owner 南京华洲新材料有限公司
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