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Preparing method and application of corrosion inhibitor restraining carbon steel acid corrosion

A corrosion inhibitor and carbon steel technology, applied in the field of imidazoline corrosion inhibitors, can solve the problems of being unable to meet the requirements of corrosion inhibition in strong acid environments, poor water solubility of corrosion inhibitors, etc., and achieve the effects of easy promotion, low toxicity, and simple preparation methods

Inactive Publication Date: 2017-11-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] Chinese patent CN201210421966.3 is a preparation method of imidazoline-type corrosion inhibitor and corrosion inhibition system, but the corrosion inhibitor synthesized from palmitic acid has poor water solubility, requires complex post-modification to improve water solubility, and cannot meet the requirements of strong acid environment. Corrosion Requirements

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  • Preparing method and application of corrosion inhibitor restraining carbon steel acid corrosion
  • Preparing method and application of corrosion inhibitor restraining carbon steel acid corrosion
  • Preparing method and application of corrosion inhibitor restraining carbon steel acid corrosion

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preparation example Construction

[0033] The preparation method of phenylpropyl imidazoline:

[0034] Mix 15g of 3-phenylpropionic acid, 15mL of diethylenetriamine, and 7mL of xylene, stir magnetically and start heating; heat up to 170°C for amidation reaction for 5 hours, then heat up to 220°C for cyclization React for 3 hours; after the reaction is completed, transfer it to a rotary evaporator for vacuum distillation to evaporate excess diethylenetriamine and xylene, then place it in a vacuum drying oven to dry at room temperature, and finally obtain dark brown viscous styrene-acrylic acid imidazoline derivatives.

[0035] The invention uses quantum chemical calculation to study the adsorption performance of phenylpropyl imidazoline and uses a weight loss method to test the corrosion inhibition performance of phenylpropyl imidazoline in acidic environment. Quantum chemical calculations were used to study the adsorption properties of different imidazoline molecules; the weight loss experiment was carried out...

Embodiment 1

[0037] Quantum chemistry calculations:

[0038] The seven kinds of imidazoline molecules obtained by the reaction of carboxylic acids such as 3-phenylpropanoic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, oleic acid and nonadecanoic acid with diethylenetriamine were calculated respectively. The energy of the frontier orbit, the result is as follows figure 1 shown.

[0039] The ΔE of phenylpropylimidazoline obtained from 3-phenylpropionic acid and diethylenetriamine is significantly smaller than that of other imidazoline molecules, so the adsorption performance is the best.

Embodiment 2

[0041] The preparation method of phenylpropyl imidazoline:

[0042] Mix 15g of 3-phenylpropionic acid, 15mL of diethylenetriamine, and 7mL of xylene, stir magnetically and start heating; heat up to 170°C for amidation reaction for 5 hours, then heat up to 220°C for cyclization React for 3 hours; after the reaction is completed, transfer it to a rotary evaporator for vacuum distillation to evaporate excess diethylenetriamine and xylene, then place it in a vacuum drying oven to dry at room temperature, and finally obtain dark brown viscous styrene-acrylic acid Based imidazoline derivatives, the yield of the product can reach 85.1%.

[0043] The infrared spectrogram data of product are as follows:

[0044] 3287cm -1 It is the stretching vibration peak of -N-H, 3026cm -1 The =C-H stretching vibration peak of the benzene ring appeared at 1604cm -1 The -C=N double bond absorption peak is the characteristic absorption peak of imidazoline at 1650cm -1 and 1555cm -1The absorption...

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Abstract

The invention provides corrosion inhibitor for carbon steel in the oil field acid environment, and particularly relates to preparation and application of low-toxicity and efficient corrosion inhibitor for restraining corrosion of carbon steel and products of the carbon steel in oil field acid pickling liquid or a saturated CO2 medium. According to the preparing method of the corrosion inhibitor, 3-phenylpropionic acid and diethylenetriamine are subjected to the dehydration reaction, and the phenylpropionic acid imidazoline ramification is obtained. According to the product, comprehensive corrosion and local corrosion is prevented from being generated in the process that the carbon steel makes contact with the acid pickling liquid or the CO2 medium. The compound does not serve as metal corrosion inhibitor at current. By adoption of the corrosion inhibitor, production is simple and convenient, toxicity is small, the inhibition rate is high, corrosion damage to the carbon steel from the acid pickling liquid or CO2 can be effectively restrained, and wide application prospects are achieved. The steps are simple, operation is convenient, and practicability is high.

Description

technical field [0001] The invention relates to an imidazoline corrosion inhibitor for inhibiting acid corrosion of carbon steel, which is used to inhibit the corrosion of carbon steel and its products in pickling solution or CO 2 A low-toxicity, high-efficiency, cheap imidazoline derivative and its application for corrosion in the environment. Background technique [0002] The oil-water mixture produced in oil and gas fields has complex components, mainly containing salts, carbon dioxide and hydrogen sulfide, etc., and the acidic environment formed will cause serious corrosion damage to the inner wall of the pipeline; in addition, the oil field will also use pickling to remove the formed The salt scale will also cause certain corrosion on the inner wall of the pipeline. Therefore, in order to suppress the acid corrosion of pipelines and prolong the life of pipelines, oil and gas fields generally adopt the method of adding corrosion inhibitors. [0003] Among many corrosio...

Claims

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Application Information

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IPC IPC(8): C23F11/14C23G1/06C23G1/08C07D233/24
CPCC23G1/068C07D233/24C23F11/149C23G1/08
Inventor 刘建国徐亚洲李自力王隆高歌季莞然
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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