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 inhibitor, can solve the problems of serious corrosion resistance of equipment and pipelines, low corrosion inhibition efficiency and poor solubility of corrosion inhibitors, and achieve excellent resistance to hydrogen sulfide and hydrogen chloride. Corrosion, wide temperature range, stable performance

Active Publication Date: 2009-11-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still some defects in the actual application of corrosion inhibitors in oil refineries: the corrosion problem of high-temperature naphthenic acid corrosion parts in vacuum towers has not been fundamentally solved for a long time, causing serious corrosion of equipment and pipelines; the corrosion inhibition efficiency of corrosion inhibitors is low , poor solubility
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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  • Water-soluble high-temperature organic acid inhibitor and preparing method and using method thereof
  • Water-soluble high-temperature organic acid inhibitor and preparing method and using method thereof

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] The embodiment that table 1 organic acid high temperature corrosion inhibitor intermediate prepares

[0013]

[0014]

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

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Abstract

The invention relates to a water-soluble high-temperature organic acid corrosion inhibitor and its preparation method and use method, including: 10 to 60% of a corrosion inhibitor intermediate obtained by reacting boric acid and organic amine in a molar ratio of 1:0.5 to 3, 20~80% C1~C9 methanol, ethanol, n-propanol, isopropanol, butanol, isobutanol, 1,2-propanediol, n-pentanol, n-heptanol, n-octanol or both Monohydric or glycol solvents composed of the above components, 0.1 to 20% thiourea, benzyl chloride, sulfene, propargyl alcohol, trisodium phosphate, ammonium phosphate sulfate, diammonium phosphate, triammonium phosphate , a corrosion inhibitor film-forming component composed of one or more components of benzotriazole. Add 30 to 1000 μg / g of the corrosion inhibitor to the naphthenic acid corrosion medium, and is suitable for inhibiting 200 ~400℃ high temperature naphthenic acid corrosion in refinery vacuum tower, resistant to hydrogen sulfide and hydrogen chloride corrosion, with a corrosion inhibition efficiency of over 90%.

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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Patent Type & Authority Patents(China)
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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