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Gas-liquid two-phase carbon dioxide corrosion inhibitor and preparation method thereof

A carbon dioxide and corrosion inhibitor technology, applied in the direction of organic chemistry, can solve the problems of production safety hazards, pipeline gas phase protection, etc., and achieve the effect of low production process requirements, less addition, and easy practical application and promotion.

Active Publication Date: 2019-11-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Both of the above two patented formulas have good anti-corrosion effects on gathering and transportation pipelines, but neither of these two formulas protect the gas phase of the pipeline; moreover, in order to improve the water solubility of corrosion inhibitors, many patented methods use grafted rings to Ethylene oxide forms imidazoline polyoxyethylene ether to improve the water solubility of corrosion inhibitors, but passing ethylene oxide in production will easily bring production safety hazards

Method used

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  • Gas-liquid two-phase carbon dioxide corrosion inhibitor and preparation method thereof
  • Gas-liquid two-phase carbon dioxide corrosion inhibitor and preparation method thereof
  • Gas-liquid two-phase carbon dioxide corrosion inhibitor and preparation method thereof

Examples

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Effect test

Embodiment 1

[0044] In this example, the preparation of the gas-liquid two-phase carbon dioxide corrosion inhibitor is divided into two steps: the first step is the synthesis of the main agent 2,5-dihydro-3,5-dimethyl-2-isopropylthiazole , the second step is the preparation of corrosion inhibitor.

[0045] Pour 28% ammonia water into a three-necked flask, add isobutyraldehyde dropwise at a temperature of 35°C under stirring (about 3 to 4 hours), and react for 9 to 10 hours after the drop;

[0046] After cooling, the solution is poured into a separatory funnel and allowed to stand for stratification, and the upper organic phase is separated (this is an intermediate product with a molecular weight of 125);

[0047] Pour the intermediate product and sulfur into a three-necked flask, stir and heat, react at a constant temperature of 140°C for about 6 hours and then cool;

[0048] The cooled solution was distilled under reduced pressure at about 50 mmHg to collect fractions.

[0049] figure ...

Embodiment 2

[0065] 2,5-dihydro-3,5-dimethyl-2-isopropylthiazole synthesized in Example 1 and pyridine quaternary ammonium salt, diphenylthiourea, propynyl alcohol, OP-10, methanol and di Methylformamide is mixed uniformly according to the following mass percentages to obtain a carbon dioxide corrosion inhibitor for gas-liquid two-phase use:

[0066]

[0067] Table 4 shows the test results of different dosages of corrosion inhibitors in the medium given in Example 1, and the test period is 4 days.

[0068] Table 4 Corrosion evaluation results of corrosion inhibitors

[0069]

[0070] According to Table 4, when the amount of carbon dioxide corrosion inhibitor for gas-liquid two-phase is 100mg / L, the corrosion rate is: gas phase 0.0601mm / a, corrosion inhibition rate reaches 71.45%; liquid phase 0.0405mm / a, slow The corrosion rate reached 87.94%. In the gas phase medium containing carbon dioxide and the liquid phase medium with high salinity, the corrosion inhibition rate of coupon sam...

Embodiment 3

[0072] 2,5-dihydro-3,5-dimethyl-2-isopropylthiazole synthesized in Example 1 and pyridine quaternary ammonium salt, diphenylthiourea, propynyl alcohol, OP-10, methanol and di Methylformamide is mixed uniformly according to the following mass percentages to obtain a carbon dioxide corrosion inhibitor for gas-liquid two-phase use:

[0073]

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Abstract

The invention provides a gas-liquid two-phase carbon dioxide corrosion inhibitor and a preparation method thereof. The gas-liquid two-phase carbon dioxide corrosion inhibitor comprises the following components of, in percentage by mass, 10%-25% of a main agent and 75%-90% of a compound, wherein according to the total mass of the gas-liquid two-phase carbon dioxide corrosion inhibitor, the compoundcomprises 10%-25% of pyridine quaternary ammonium salt, 3%-10% of diphenylthiourea, 3%-5% of propargyl alcohol, 4%-5% of a surfactant and 30%-70% of a solvent; and the main agent is 2, 5-dihydro-3, 5-dimethyl-2-Isopropyl thiazole. The gas-liquid two-phase carbon dioxide corrosion inhibitor can be used for effectively protecting oil-gas field gathering pipelines and equipment in a hypersalinity waste water environment containing CO2 gas, and has the characteristics of being good in water solubility and compatibility, low in filling concentration, excellent in anti-corrosion effect, low in production process requirement and the like in application processes of industrial production and oil-gas field gathering pipelines.

Description

technical field [0001] The invention belongs to the protection of metal materials in the petrochemical field, and in particular relates to a carbon dioxide corrosion inhibitor for gas-liquid two-phase and a preparation method thereof. Background technique [0002] Corrosion inhibition treatment is an important anticorrosion method for sour oil and gas fields at home and abroad, and the specific corrosion inhibition treatment process is determined according to the characteristics of the gathering and transportation system itself. In recent years, although the research on corrosion inhibitors for oil and gas field gas gathering pipeline corrosion has made great progress at home and abroad, a series of corrosion inhibitors have been developed, mainly including: organic amines, amides, imidazolines, quaternary ammonium salts , heterocyclic compounds and organosulfurs, etc. For example, the corrosion inhibitor developed by Zhao Changlong et al. (CN200810054162.8), the main compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02C23F11/16C07D277/10
CPCC23F11/02C23F11/165C07D277/10
Inventor 宋文文张娟涛周理志孟祥娟
Owner PETROCHINA CO LTD
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