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Imidazoline derivant, method of preparing the same, and uses of the same as gas-liquid diphasic inhibitor

A technology of imidazoline derivatives and derivatives, applied in the direction of organic chemistry, etc., to achieve the effects of simple operation, high corrosion inhibition efficiency and small dosage

Inactive Publication Date: 2009-02-18
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the severe wet gas phase corrosion in the above-mentioned application environments cannot be ignored, and at the same time, it is suitable for brines with higher temperature and acid gases such as carbon dioxide (seawater, brine, groundwater, oilfield reinjection water, oil and gas transmission media, drilling / completion There are no reports on gas-liquid dual-phase corrosion inhibitors that have good corrosion inhibition effects on carbon steel in liquids, etc.

Method used

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  • Imidazoline derivant, method of preparing the same, and uses of the same as gas-liquid diphasic inhibitor
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  • Imidazoline derivant, method of preparing the same, and uses of the same as gas-liquid diphasic inhibitor

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Embodiment Construction

[0010] The imidazoline derivatives of the present invention are synthesized according to the following two steps, the first step:

[0011]

[0012] Step two:

[0013]

[0014] In the formula, R is a C7 to C16 alkyl group.

[0015] The corrosion inhibitor of the present invention is mainly composed of the above-mentioned compounds, but no purification is required. When the mixture obtained during the preparation is used as the gas-liquid two-phase corrosion inhibitor for the experiment, Q235 carbon steel is used as the sample, and the specification is 50mm×10mm×3mm. The carbon steel used is polished, rinsed with tap water, rinsed with alcohol, and dried with cold air according to the usual practice, and then placed in a desiccator equipped with silica gel desiccant for 24 hours before use. The experimental medium is an aqueous solution of NaCl filled with saturated carbon dioxide, airtight, the temperature is 40-80°C, and the test period is 72 hours. The experiment ado...

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Abstract

The present invention relates to an imidazoline derivative. The imidazoline derivative is characterized in that the molecular formula is [R-CN2CH2CH2]-(CH2)2-NHCSNH2, wherein, R is C7 to C16 alkyl. The preparation method comprises two steps: firstly, diethylene triamine and 8 to 17 alkyl organic acid are used for synthesizing an intermediate product alkyl imidazoline under the condition with dimethylbenzene; secondly, thiourea is directly added into the intermediate product alkyl imidazoline, and the imidazoline derivative can be synthesized under the identical condition with the dimethylbenzene. The imidazoline derivative can be used as gas-liquid phase corrosion inhibitor which can inhibit corrosion of carbon and steel in the brine with carbon dioxide. The inhibitor is not only suitable for the brine with carbon dioxide of high salinity, but also suitable for the gas phase with carbon dioxide. And the present invention has the advantages that the amount for application is low, the inhibition efficiency is high, the operation for preparation is simple, and the utilization is convenient.

Description

technical field [0001] The invention relates to an imidazoline derivative, its preparation method and its application as a gas-liquid two-phase corrosion inhibitor. Background technique [0002] The use of corrosion inhibitors has a history of more than 100 years. It is a convenient and low-cost protection technology, and it is often suitable for fluid transportation such as pipelines. In brine containing carbon dioxide, not only liquid phase corrosion but also gas phase corrosion exist. At present, there are many liquid-phase corrosion inhibitors used in brine containing carbon dioxide, the main components of which are heterocyclic compounds or organic acids or amides, and are widely used in oilfield produced water and oil and gas pipelines. However, the severe wet gas phase corrosion in the above-mentioned application environments cannot be ignored, and at the same time, it is suitable for brines with higher temperature and acid gases such as carbon dioxide (seawater, bri...

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Application Information

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IPC IPC(8): C07D233/24C23F11/04
Inventor 杜敏张静王庆璋
Owner OCEAN UNIV OF CHINA
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