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Citric acid pickling corrosion inhibitor

A technology of pickling corrosion inhibitor and citric acid, applied in the field of corrosion inhibitor, can solve problems such as refractory degradation and high toxicity, and achieve the effects of easy degradation, low cost and high cost solution

Active Publication Date: 2015-09-30
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the corrosion inhibitors for citric acid pickling are organic compounds such as aromatic hydrocarbons and thiourea, but their main disadvantages are that they are highly toxic and difficult to degrade. With the improvement of human environmental awareness, toxic and harmful corrosion inhibitors The use will be restricted, and the development of efficient and environmentally friendly corrosion inhibitors has become the trend of corrosion inhibitor research today.

Method used

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  • Citric acid pickling corrosion inhibitor
  • Citric acid pickling corrosion inhibitor
  • Citric acid pickling corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking the preparation of citric acid pickling corrosion inhibitor 1kg of the present invention as an example, it is made from the raw materials of the following mass proportions:

[0024]

[0025]

[0026] The preparation method is as follows: 80 g of 2-dodecanol ether methylene-N-amine ethyl imidazoline, 40 g of lauric acid, 80 g of sodium methylene dinaphthalene sulfonate, 50 g of dimethylene-1,2-bis( Cetyl dimethyl ammonium bromide), 80g monoethanolamine, 80g ethylene glycol were added into 590g water, and stirred evenly.

[0027] In this example, 2-dodecyl ether methylene-N-amine ethyl imidazoline and dimethylene-1,2-bis(hexadecyldimethylammonium bromide) were all produced by Shaanxi Petrochemical Provided by Research and Design Institute, the structural formula of 2-dodecyl ether methylene-N-amine ethyl imidazoline is

Embodiment 2

[0029] Taking the preparation of citric acid pickling corrosion inhibitor 1kg of the present invention as an example, it is made from the raw materials of the following mass proportions:

[0030]

[0031] The preparation method is the same as that of Example 1.

[0032] In this example, 2-hexadecyl ether methylene-N-amine ethyl imidazoline and dimethylene-1,2-bis(hexadecyldimethylammonium bromide), dimethylene- 1,2-bis(dodecyldimethylammonium bromide) was provided by Shaanxi Petrochemical Research and Design Institute, and the structural formula of 2-hexadecyl ether methylene-N-amine ethyl imidazoline is

Embodiment 3

[0034] Taking the preparation of citric acid pickling corrosion inhibitor 1kg of the present invention as an example, it is made from the raw materials of the following mass proportions:

[0035]

[0036] The preparation method is the same as that of Example 1.

[0037] In this example, 2-hexadecanol ether methylene-N-amine ethyl imidazoline and dimethylene-1,2-bis(dodecyldimethylammonium bromide), dimethylene- 1,2-bis(octadecyldimethylammonium bromide) was provided by Shaanxi Petrochemical Research and Design Institute, and the structural formula of 2-hexadecyl ether methylene-N-amine ethyl imidazoline is

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Abstract

The invention discloses a citric acid acid-pickling inhibitor. The citric acid acid-pickling inhibitor is formed by mixing the following components in percent by weight: 5%-10% of alcohol ether carboxylic acid imidazoline, 3%-6% of lauric acid, 6%-10% of disodium methylene dinaphthalenesulfonate, 2%-6% of quaternary ammonium salt cationic type dimeric surfactant, 2%-15% of ethylene glycol, 6%-9% of monoethanolamine and the balance of water. The citric acid acid-picking inhibitor disclosed by the invention has the characteristics of easily available materials, moderate cost, easiness for degradation, less environment influences, good compatibility, remarkable corrosion inhibition effect on cleaning an austenite stainless steel material, and the like, has a good synergistic effect among components, and very strong capability for inhibiting Fe<3+> corrosion, and can be applied to citric acid acid-pickling liquor of thermal equipment such as a power station boiler.

Description

technical field [0001] The invention belongs to the technical field of corrosion inhibitor for washing metal materials with acid solution, in particular to a citric acid pickling corrosion inhibitor, which can be used as a corrosion inhibitor for thermal power plants, petrochemicals, metallurgical machinery and equipment and pipeline pickling. Background technique [0002] Power plant boilers have high parameters and large capacity, and pickling plays a vital role in ensuring the safe and efficient operation of equipment and reducing heat loss. Currently used pickling agents include inorganic acids such as hydrochloric acid, nitric acid, and hydrofluoric acid, and organic acids such as sulfamic acid, citric acid, acetic acid, formic acid, and glycolic acid. Inorganic acid cleaning has the advantages of strong force, fast speed, obvious effect and low cost, especially for hard scales containing complex silicates and sulfides, the cleaning effect is more significant; It is hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23F11/04
Inventor 刘世川刘彦锋李俊莉程雯王晓晖马思远
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND