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Polyethylene glycol oleic acid imidazoline corrosion inhibitor and preparation method thereof

A technology of polyethylene glycol oleic acid imidazoline and oleic acid imidazoline, applied in the field of polyethylene glycol oleic acid imidazoline corrosion inhibitor and its preparation, can solve poor stability, strong pungent smell, unsuitable for long-term storage, etc. problems, to achieve the effects of increasing polarity, improving water solubility, and facilitating large-scale production

Active Publication Date: 2019-04-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the quaternary ammonium reagents are carcinogens and have a strong pungent smell, and because the polarity level of the quaternary ammonium salt is not enough to ensure that the entire imidazoline molecule is well soluble in water, its stability is poor, and it is not suitable for long-term use. store

Method used

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  • Polyethylene glycol oleic acid imidazoline corrosion inhibitor and preparation method thereof
  • Polyethylene glycol oleic acid imidazoline corrosion inhibitor and preparation method thereof
  • Polyethylene glycol oleic acid imidazoline corrosion inhibitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Add 28.3 g of oleic acid (100 mmol), 12.38 g of diethylenetriamine (120 mmol) and 50 ml of water-carrying agent xylene into a round bottom flask equipped with a water separator and a condenser. Raise the temperature to 150°C and react for 3 hours. Continue to heat up to 210°C for 6 hours. After the reaction, excess xylene and unreacted diethylenetriamine were distilled off under reduced pressure at 150°C. Obtain oleic acid imidazoline (OIM);

[0030] (2) Mix 3 g of polyethylene glycol monomethyl ether (4 mmol) with a molecular weight of 750 g / mol and 70% sodium hydroxide (0.48 g, 12 mmol) in a round-bottomed flask, and heat up to 40° C. Alcohol monomethyl ether was melted, and 0.94 mL of epichlorohydrin (12 mmol) was added dropwise, and the reaction was continued at 40° C. for 0.5 hours after the dropwise addition. After the sodium hydroxide particles were removed by suction filtration, unreacted epichlorohydrin was removed by rotary evaporation. Epoxy-terminate...

Embodiment 2

[0033] (1) Add 28.3 g of oleic acid (100 mmol), 20.63 g of diethylenetriamine (200 mmol) and 50 ml of water-carrying agent xylene into a round bottom flask equipped with a water separator and a condenser. Raise the temperature to 150°C and react for 3 hours. Continue to heat up to 210°C for 10 hours of reaction. After the reaction, excess xylene and unreacted diethylenetriamine were distilled off under reduced pressure at 150°C. Obtain oleic acid imidazoline (OIM);

[0034] (2) Mix 3 g of polyethylene glycol monomethyl ether (3 mmol) with a molecular weight of 1000 g / mol and 90% sodium hydroxide (0.36 g, 9 mmol) in a round bottom flask, and heat up to 40° C. The alcohol monomethyl ether was melted, and 0.71 mL of epichlorohydrin (9 mmol) was added dropwise, and the reaction was continued at 40° C. for 1 hour after the dropwise addition. After the sodium hydroxide particles were removed by suction filtration, unreacted epichlorohydrin was removed by rotary evaporation. Epox...

Embodiment 3

[0037] (1) Add 28.3g of oleic acid (100mmol), 12.38g of diethylenetriamine (120mmol) and 50ml of water-carrying agent xylene into a round bottom flask equipped with a water separator and a condenser. Raise the temperature to 150°C and react for 3 hours. Continue to heat up to 210°C for 10 hours of reaction. After the reaction, excess xylene and unreacted diethylenetriamine were distilled off under reduced pressure at 150°C. Obtain oleic acid imidazoline (OIM);

[0038] (2) Mix 3.9 g of polyethylene glycol monomethyl ether (3 mmol) and 90% sodium hydroxide (0.48 g, 12 mmol) in a round-bottomed flask with a molecular weight of 1300 g / mol, and heat up to 45° C. Glycol monomethyl ether was melted, and 2.35 mL of epichlorohydrin (30 mmol) was added dropwise. After the dropwise addition, the reaction was continued at 40° C. for 1 hour. After the sodium hydroxide particles were removed by suction filtration, unreacted epichlorohydrin was removed by rotary evaporation. Epoxy-termi...

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Abstract

The invention discloses a polyethylene glycol oleic acid based imidazoline water-soluble corrosion inhibitor and a preparation method thereof. Firstly, oleic acid and diethylenetriamine react to prepare oleic acid imidazoline; in the alkaline environment, epoxy chloropropane and methoxy polyethylene glycol or polyethylene glycol react to prepare polyethylene glycol with an epoxy group or epoxy groups at one end or two ends; and finally, the oleic acid imidazoline and the single-end epoxy methoxy polyethylene glycol or the two-end epoxy polyethylene glycol react to obtain the corresponding polyethylene glycol oleic acid based imidazoline water-soluble corrosion inhibitor. The polyethylene glycol oleic acid based imidazoline water-soluble corrosion inhibitor and the preparation method have the beneficial effects that the corrosion inhibitor has good water solubility, and the inhibition rate reaches 95% or above under the quantity of 75 ppm.

Description

technical field [0001] The invention relates to the technical fields of petrochemical industry and fine chemical industry, in particular to a polyethylene glycol oleic acid imidazoline corrosion inhibitor and a preparation method thereof. Background technique [0002] Corrosion inhibitors are widely used in petrochemical, chemical cleaning, industrial water and other fields. They are effective protective measures to prevent metal materials and their alloys from corroding in the environment of use. [0003] Imidazoline and its derivatives are widely used corrosion inhibitors. It has the advantages of good thermal stability, low toxicity, easy formation of adsorption film on the metal surface, and good corrosion inhibition effect. However, there are also inherent defects of poor water solubility, which limits its large-scale application to a certain extent. Compared with oil-soluble imidazoline, water-soluble imidazoline has outstanding advantages such as high safety during ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/173C08G65/337C08G65/333
CPCC08G65/33317C08G65/337C23F11/173
Inventor 张万斌张光华朱军峰
Owner SHAANXI UNIV OF SCI & TECH
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