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Low-temperature corrosion inhibitor

A corrosion inhibitor and low-temperature technology, applied in the field of low-temperature corrosion inhibitors, can solve problems such as difficult prevention, single protective measures, and complex corrosion mechanism, and achieve the effect of strengthening corrosion inhibition, inhibiting corrosion, and good corrosion inhibition effect

Inactive Publication Date: 2012-10-17
WUHAN RUNERHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] High-temperature sulfur corrosion is a chemical corrosion mechanism, often manifested as uniform corrosion, with a single protective measure, and relatively easy to control. The use of reasonable metal materials can solve the problem of high-temperature sulfur corrosion; while wet hydrogen sulfide corrosion is electrochemical corrosion, often with materials The form of cracking damage is manifested, the corrosion mechanism is complex, the solution measures vary widely due to the different corrosion media and corrosion conditions, and the prevention is difficult

Method used

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Embodiment 1

[0015] This embodiment discloses a low-temperature corrosion inhibitor, its composition and mass percentage are:

[0016] Compound solvent 30%, water-soluble imidazoline compound 40%, acetylenic alcohol compound 7%, nitrogen-containing adsorption corrosion inhibitor 15%, passivation corrosion inhibitor 5%, mercapto-substituted carboxylic acid 3%;

[0017] The compound solvent is formed by mixing water and methanol, wherein the mass content of the water is 20%, and the mass content of the methanol is 10%;

[0018] The water-soluble imidazoline compound is composed of naphthenic acid imidazoline;

[0019] The acetylenic alcohol compound consists of propynyl alcohol;

[0020] The nitrogen-containing adsorption type corrosion inhibitor is composed of benzotriazole;

[0021] The passivation type corrosion inhibitor is composed of ammonium nitrite in nitrite;

[0022] The mercapto-substituted carboxylic acid consists of dimercaptosuccinic acid.

[0023] The preparation method of...

Embodiment 2

[0029] This embodiment discloses a low-temperature corrosion inhibitor, its composition and mass percentage are:

[0030] Compound solvent 23%, water-soluble imidazoline compound 42%, acetylene alcohol compound 8%, nitrogen-containing adsorption corrosion inhibitor 20%, passivation corrosion inhibitor 3%, mercapto-substituted carboxylic acid 4%;

[0031] The compounding solvent is composed of water,

[0032] The water-soluble imidazoline compound is composed of imidazoline oleate;

[0033] The acetylenic alcohol compound is composed of butynediol diethoxy ether;

[0034] The nitrogen-containing adsorption type corrosion inhibitor is composed of benzothiazole;

[0035] The passivation type corrosion inhibitor is made up of ammonium nitrate in nitrate;

[0036] The mercapto-substituted carboxylic acid consists of thioglycolic acid.

[0037] The preparation method of the low temperature corrosion inhibitor described in the present embodiment is as follows:

[0038] First, pu...

Embodiment 3

[0041] This embodiment discloses a low-temperature corrosion inhibitor, its composition and mass percentage are:

[0042] Compound solvent 21%, water-soluble imidazoline compound 45%, acetylenic alcohol compound 6%, nitrogen-containing adsorption corrosion inhibitor 23%, passivation corrosion inhibitor 3%, mercapto-substituted carboxylic acid 2%;

[0043] The compound solvent consists of water,

[0044] The water-soluble imidazoline compound is composed of naphthenic acid imidazoline;

[0045] The alkynyl alcohol compound consists of hydroxypropargyl ether;

[0046] The nitrogen-containing adsorption type corrosion inhibitor is composed of urotropine;

[0047] The passivation type corrosion inhibitor is made up of ammonium borate;

[0048] The mercapto-substituted carboxylic acid consists of mercaptopropionic acid.

[0049] The preparation method of the low temperature corrosion inhibitor described in the present embodiment is as follows:

[0050] First put water, imidazo...

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Abstract

The invention belongs to the field of chemical additives and discloses a low-temperature corrosion inhibitor. The low-temperature corrosion inhibitor comprises the following ingredients of: by weight, 30-50% of a water-soluble imidazoline compound, 3-15% of an alkynol compound, 12-45% of a nitrogen-containing adsorption-type corrosion inhibitor, and 20-40% of a compounded solvent. The low-temperature corrosion inhibitor provided by the invention is resistant to high-density wet hydrogen sulfide and chloride corrosion, is safe and sanitary, and has no pollution.

Description

technical field [0001] The invention belongs to the field of chemical additives, in particular to a low-temperature corrosion inhibitor used for suppressing wet hydrogen sulfide corrosion at low-temperature condensation parts. Background technique [0002] Sulfides in crude oil are converted during processing to H2 which is aggressive to refinery units 2 S, when H 2 When S coexists with liquid water or water-containing streams, a wet hydrogen sulfide corrosion environment is formed. [0003] Wet hydrogen sulfide corrosion usually exists in the low-temperature condensation part of the refinery unit, throughout the entire refining process, when hydrogen sulfide is combined with other corrosive media to form HCl-H 2 S-H 2 O, HCN-H 2 S-H 2 O, H 2 S-H 2 O and CO 2 -H 2 S-H 2 O and other different types of wet hydrogen sulfide corrosive environments. [0004] High-temperature sulfur corrosion is a chemical corrosion mechanism, often manifested as uniform corrosion, with...

Claims

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Application Information

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IPC IPC(8): C23F11/14
Inventor 吴宇锋朱琼徐文刚崔小刚
Owner WUHAN RUNERHUA TECH
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