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Water-soluble high-temperature organic acid inhibitor and preparing method and using method thereof

An organic acid and corrosion inhibitor technology, applied in the field of high-temperature organic acid corrosion inhibitors, to achieve excellent corrosion resistance to hydrogen sulfide and hydrogen chloride, stable performance, and easy production

Active Publication Date: 2008-02-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of water-soluble organic acid corrosion inhibitors for inhibiting organic acid corrosion, especially high temperature (above 200 ° C), is still blank in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～18

[0010] Examples 1-18: Preparation of organic acid high-temperature corrosion inhibitor intermediate

[0011] Put boric acid and organic amine in a three-necked flask at a molar ratio of 1:0.5 to 1:3, add a hydrocarbon solvent accounting for 5 to 30% of the total weight of the acid compound and organic amine, and heat up to 100 ~300°C, reflux for 2~20 hours, when the acid value of the reaction mixture reaches 3~20mgKOH / g, the reaction ends, and a high-temperature organic acid corrosion inhibitor intermediate is obtained.

[0012] Table 1 Examples of Preparation of Organic Acid High Temperature Corrosion Inhibitor Intermediates

[0013] Example

[0014] Example 14

Embodiment 19～51

[0015] Examples 19-51: Preparation of a water-soluble high-temperature organic acid corrosion inhibitor

[0016] After cooling the high-temperature organic acid corrosion inhibitor intermediate accounting for 10-60% by weight of the water-soluble high-temperature organic acid corrosion inhibitor to 60-70°C, add the water-soluble high-temperature organic acid corrosion inhibitor weight percentage while stirring under normal pressure. The percentage is 20~80% selected from C 1 ~C 9 One or two or more components of methanol, ethanol, n-propanol, isopropanol, butanol, isobutanol, 1,2-propanediol, n-pentanol, n-heptanol, n-octanol The combined monoalcohol or diol solvent, and 0.1-20% by weight of the water-soluble high-temperature organic acid corrosion inhibitor are selected from thiourea, benzyl chloride, thioene, propynyl alcohol, trisodium phosphate, phosphorus Corrosion-inhibiting and film-forming components composed of one of ammonium sulfate, diammonium phosphate, triammon...

3 Embodiment 52～70

[0020] 3 Examples 52-70: Examples of the practical application of corrosion inhibitors

[0021] Add 30-1000 μg / g of the corrosion inhibitor into the high-temperature organic acid corrosion medium at 200-400° C. and mix evenly. The performance evaluation of corrosion inhibition effect adopts the national standard GB10124-86 "Metal Material Laboratory Uniform Corrosion Inhibition Full Immersion Test Method" to carry out the static measurement of the corrosion rate of the corrosion inhibitor. The test container used for corrosion inhibition evaluation can be a high temperature resistant, pressure resistant, corrosion resistant sealed container, and the material of the container can be 316L, 1Cr18Ni9Ti and other stainless steel or plastic or glass.

[0022] Table 3 Practical application examples of corrosion inhibitors

[0023] Example

[0024] .

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PUM

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Abstract

The present invention relates to a high-temperature organic acid corrosion inhibitor for inhibiting refinery vacuum tower high-temperature naphthenic acid corrosion environment with 200-400deg.C. Its composition includes (by wt%) 10-60% of corrosion inhibitor intermediate obtained by using boric acid and organic amine according to the mole ratio of 1:0.5-3 through a certain reaction process, 20-80% of monohydric alcohol or dihydric alcohol solvent formed from one kind and two kinds of methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, 1,2-propylene glycol, n-amyl alcohol, n-heptyl alcohol and n-caprylic alcohol or combination of more than two kinds of above-mentioned components and 0.1-20% of corrosion inhibition film-forming component formed from one kind or any two kinds of sulfourea, benzyl chloride, alkylene sulfide, propiolic alcohol, trisodium phosphate, ammonium phosphosulfate, diammonium phosphate, triammonium phosphate and benzotriazole or combination of more than two kind of above-mentioned all the components.

Description

technical field [0001] The invention relates to a high-temperature organic acid corrosion inhibitor used for suppressing the high-temperature naphthenic acid corrosion environment of a refinery decompression tower at 200-400°C. Background technique [0002] At present, in the research on acid corrosion inhibitors at home and abroad, the research on inorganic acid (such as hydrochloric acid, earth acid, etc.) The research on corrosion inhibitors for acid (such as carboxylic acid, naphthenic acid, etc.) corrosion has not been reported. Organic acid corrosion is ubiquitous in industrial production, and the most prominent performance is the corrosion of equipment in the process of oil refining. Since my country currently processes a large amount of imported crude oil, some of which are high-sulfur and high-acid value crude oil, severe corrosion will occur in the parts of the device that are rich in organic acids during processing. For example, when processing Karamay naphtheni...

Claims

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Application Information

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IPC IPC(8): C23F11/04C23F11/10
Inventor 李磊孟祥胜牛春革罗来龙马玲韩韫
Owner PETROCHINA CO LTD
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