Novel imidazoline compound corrosion inhibitor and preparation method thereof

A technology of corrosion inhibitor and imidazoline, which is applied in the field of new imidazoline compound corrosion inhibitor and its preparation, can solve the problems of poor corrosion inhibitor effect, and achieve the effect of good stability, high efficiency and simple components

Active Publication Date: 2016-01-20
SHENZHEN GCD PETROLEUM ADDITIVE CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of corrosion inhibitor is less effective when used alone, and is usually only suitable for certain types of specific media, and generally needs to be used in combination

Method used

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  • Novel imidazoline compound corrosion inhibitor and preparation method thereof
  • Novel imidazoline compound corrosion inhibitor and preparation method thereof
  • Novel imidazoline compound corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 (preparation of imidazoline quaternary ammonium salt)

[0020] a) Add oleic acid (0.1mol), diethylenetriamine (0.12mol) and xylene (40ml) into a reactor equipped with reflux, stirring, and water separation devices, heat up to 150°C under stirring, and keep warm for 3h, Continue to raise the temperature to 220°C, keep it warm for 2h, until no water is formed in the reaction system, then cool down to 100°C, add benzyl chloride (0.1mol), react for 3h, and finally remove low boilers by distillation under reduced pressure to obtain imidazoline quaternary ammonium salt a .

[0021] b) Add oleic acid (0.1mol), ethylenediamine (0.12mol), toluene (40ml) and aluminum oxide (0.2g) into a reactor equipped with reflux, stirring, and water separation devices, and heat up under stirring Heat to 150°C, keep warm for 2h, continue to heat up to 220°C, keep warm for 1h, until no water is formed in the reaction system, then cool down to 100°C, add benzyl chloride (0.11mol), r...

Embodiment 2

[0025] Embodiment 2 (compound)

[0026] According to imidazoline quaternary ammonium salts a, b, c, d, e prepared in Example 1 and thiourea or its derivatives, alkali metal halides and urotropine are compounded to prepare different types of corrosion inhibitors, Its active ingredients and their quality ratios are shown in Table 1.

[0027] Table 1

[0028]

Embodiment 3

[0029] Embodiment 3 (evaluation)

[0030] Dilute the corrosion inhibitor compounded above into an aqueous solution with a mass ratio of 20%, and then use different types of acid solutions as corrosion media, and use the static evaluation method to evaluate the corrosion inhibition effect (dosing is based on the corrosion inhibitor before dilution). Mass meter), the experimental results are shown in Table 2-4.

[0031] Table 2 Comparison of corrosion inhibition effects of various compound corrosion inhibitors and commercial pickling corrosion inhibitor RX-302 in 5% sulfuric acid

[0032]

[0033]

[0034] Note: Test conditions: normal pressure, temperature 90°C, time 3h; test material: A3 steel;

[0035] Table 3 Comparison of corrosion inhibition effects of various compound corrosion inhibitors and commercial pickling corrosion inhibitor RX-302 in 6% glacial acetic acid

[0036] serial number

Corrosion inhibitor number

Add dose, %

Corrosion rate, m...

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PUM

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Abstract

The invention provides a novel imidazoline compound corrosion inhibitor and belongs to the field of metal corrosion inhibition. The corrosion inhibitor aims at solving the problems that most oxidation film type corrosion inhibitors and precipitating film type corrosion inhibitors contain heavy metal or the phosphorus element, are large in toxicity and severely pollute the environment. The effective components of the corrosion inhibitor are formed by compounding, by mass, 10% to 30% of thiourea derivatives, 5% to 30% of alkali halide, 30% to 80% of imidazoline-ammonium-salt derivatives and 0 to 15% of urotropin. Raw materials or components of the novel imidazoline compound corrosion inhibitor prepared through the process are simple and easy to obtain and free of or low in toxicity, the characters of molecules of all the components are greatly different, the radii of the molecules of all the components are greatly different as well, and the complementary performance is high; all the components can be adsorbed to the metal surface after being compounded to form a dense monomolecular film; and the corrosion inhibitor has the beneficial effects of being good in universality, small in use amount, high in efficiency, low in toxicity, good in stability, simple in preparation process, low in cost and the like.

Description

technical field [0001] The invention belongs to the field of metal corrosion inhibition and relates to a novel imidazoline compound corrosion inhibitor and a preparation method thereof. The corrosion inhibitor can effectively inhibit the corrosion of metals in various use environments and protect metal equipment. technical background [0002] Among various metal corrosion protection methods, the use of corrosion inhibitors is a method with simple process, low cost and strong applicability. Production practice shows that the corrosion rate of metals in acidic media is much higher than that in other media. Therefore, it is an important topic to study corrosion inhibitors for metals corroded in acidic media. Among them, the metal pickling process and petroleum oil (gas) well acidizing process have harsh operating conditions, a large demand for corrosion inhibitors, and high quality requirements, which have always been research hotspots. [0003] At present, according to the ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14
CPCC23F11/14
Inventor 熊靓严斌刘影
Owner SHENZHEN GCD PETROLEUM ADDITIVE CO
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