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Imidazoline corrosion inhibitor, synthetic method and application thereof

The technology of imidazoline and synthesis method is applied in the field of imidazoline corrosion inhibitor and synthesis, and can solve the problems of pitting corrosion, iron corrosion, safety of boiler system, hidden dangers left by stable operation, etc., and achieves simple usage and low cost. Effect

Inactive Publication Date: 2015-04-15
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The occurrence of these failures will leave hidden dangers to the safe and stable operation of the boiler system.
[0004] In the research, it is found that the boiler is mainly corroded by iron oxides, and there are certain pitting corrosion, which also brings great hidden dangers to the safe operation of the boiler. Therefore, it is necessary to develop a corrosion inhibitor for the boiler system of the natural gas treatment plant

Method used

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  • Imidazoline corrosion inhibitor, synthetic method and application thereof
  • Imidazoline corrosion inhibitor, synthetic method and application thereof
  • Imidazoline corrosion inhibitor, synthetic method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides an imidazoline corrosion inhibitor, which is obtained by reacting rosin with diethylenetriamine to obtain an imidazoline intermediate, and then reacting with N,N-dimethylacetamide to obtain rosin -Imidazolium-N, N-dimethylacetamidine, finally obtained by reacting with carbon dioxide.

[0042] The present embodiment also provides the synthetic method of above-mentioned imidazoline corrosion inhibitor, comprises the following steps:

[0043] Step 1: Reaction of rosin and diethylenetriamine to obtain an imidazoline intermediate, the chemical reaction formula is as follows,

[0044] .

[0045] Step 1 specifically includes the following steps including the following steps,

[0046] (1) Mix rosin (58.0795g, 0.1731moL) and xylene at a mass ratio of 1:9, and add it to a three-necked flask equipped with a water separator, a reflux condenser, and a thermometer;

[0047] (2) Heat to 100°C to completely dissolve the rosin in xylene, and start to add di...

Embodiment 2

[0062] This embodiment provides an application of the above-mentioned imidazoline corrosion inhibitor: the concentration range in use is 200-400 mg / L.

[0063] The following are confirmed by specific experiments:

[0064] 1. Synthesis of corrosion inhibitors

[0065] Synthesize the corrosion inhibitor according to the synthesis method of the corrosion inhibitor, that is, use 58.0795g (0.1731mol) of rosin and 25.0000g (0.2423mol) of diethylenetriamine as raw materials, synthesize the rosin-imidazoline intermediate by solvent method, and then Using 65.0000g (0.7496mol) of rosin-imidazoline intermediate and 56.1759g (0.2496mol) of N,N-dimethylacetamide as raw materials to synthesize rosin-imidazoline-N,N-dimethylacetamide by direct synthesis Finally, react the synthesized rosin-imidazoline-N,N-dimethylacetamidine with carbon dioxide under certain conditions to generate rosin-imidazoline-acetamidine bicarbonate. Under the condition that the corrosive medium is alcohol-containing...

Embodiment 3

[0097] This embodiment provides an application of the above-mentioned imidazoline corrosion inhibitor: after every 25 hours in use, a new imidazoline corrosion inhibitor needs to be replaced.

[0098] The following are confirmed by specific experiments:

[0099] 1. Synthesis of corrosion inhibitors

[0100] Synthesize novel imidazoline corrosion inhibitor according to the method for synthesizing corrosion inhibitor in embodiment 2, then when corrosion inhibitor consumption is 700mg / L, corrosion medium is that mass fraction is 3%NaCl and 1% hydrochloric acid solution, and corrosion temperature is 80 ℃, the corrosion test was carried out to investigate the influence of corrosion time on the corrosion inhibition effect of corrosion inhibitors.

[0101] 2. Static hanging test as in Example 2.

[0102] 3. Experimental results

[0103] like figure 2 As shown, before the corrosion time is 25 h, the corrosion rate gradually decreases with the prolongation of the corrosion time, a...

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Abstract

The invention relates to an imidazoline corrosion inhibitor, a synthetic method and application thereof, and is applicable to boiler anticorrosion in natural gas processing plant. The imidazoline corrosion inhibitor comprises main agent of rosin, and additives of bis(beta-aminoethyl) amineand N,N-dimethyl acetamide. In addition, on the basis of synthesis of imidazoline corrosion inhibitor, guanyl with closing-opening performance under the action of CO2 / N2 is introduced, so as to on the one hand improve the corrosion inhibition performance of on CO2, and on the other hand recycle the inhibitor. Finally, under simulated field conditions, when the dosage of the corrosion inhibitor is at 400 mg / L, the inhibition rate reaches 80%, and the corrosion rate and corrosion inhibition efficiency are good. The corrosion inhibitor mainly inhibits the cathodic hydrogen evolution reduction reaction as well as anodic metal dissolution effect, and belongs to a mixed type corrosion inhibitor focusing on anodic inhibition. The corrosion inhibitor provided by the invention has the advantages of low cost, simple and efficient usage mode, low toxicity, no stimulation, no odor and reduction of pollution on water and environment.

Description

technical field [0001] The invention specifically relates to an imidazoline corrosion inhibitor, a synthesis method and an application thereof. Background technique [0002] A corrosion inhibitor is a substance that can inhibit the destruction process of metals in corrosive media at very low concentrations. In the process of oil and natural gas extraction, acid fracturing technology is often used at this stage to enhance recovery. Acid fracturing technology is a very effective stimulation measure. Its principle is to inject hydrochloric acid, soil acid or other acid solutions into the formation by mechanical means, so as to dissolve the clogged substances in the seepage channels, the clogged substances in the formation fractures and the formation rocks. Certain components of the oil can expand oil and gas passages, reduce oil flow resistance, and achieve the purpose of increasing production. In the application process of acid fracturing technology, the injection of strong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02
Inventor 刘帮华解永刚田喜军韩东兴樊志强王轩王蕾王霞胡均志黄雪萍常霞马鹏飞刘建生
Owner PETROCHINA CO LTD
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