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Scale and corrosion inhibitor

A scale and corrosion inhibitor, the technology of weight percentage, applied in the fields of scale removal and water softening, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of reducing heat transfer efficiency, poor scale removal effect, composition single problem

Inactive Publication Date: 2014-04-09
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The use of circulating water in industry is beneficial to save the cost of enterprises and improve the benefits of enterprises. However, there will be two problems in the process of using circulating water. One is the evaporation of water, which causes the crystallization and precipitation of salts. The most common ones are Calcium carbonate, calcium silicate and other scales, the existence of scales greatly reduces the heat transfer efficiency, and the second is the electrochemical corrosion of circulating water on the equipment. Human life. At present, scale and corrosion inhibitors are added to circulating water to reduce the appearance of scale. However, the current scale and corrosion inhibitors on the market have a single component and the descaling effect is not good, especially for copper, brass pipes and wide pH. The treatment effect of circulating water is not good, which is the deficiency of existing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A scale and corrosion inhibitor, consisting of the following components by weight percentage:

[0065] Aminotrimethylene phosphonic acid 25%

[0066] Hydroxyethylidene diphosphonic acid 2%

[0067] Sodium chloride 5%

[0068] Polyacrylic acid 3%

[0069] Hydrolyzed Polymaleic Acid 1%

[0070] Sodium ethylenediamine tetramethylene phosphonate 8%

[0071] The rest is water.

[0072] The pH of the raw water is 11, and 30mg / L of scale and corrosion inhibitors are added. The adhesion speed of the copper test tube is 6.32mcm and the corrosion rate is 0.0003519mm / a, and the adhesion speed of the brass test tube is 6.11mcm, and the corrosion rate is 6.11mcm. Speed ​​0.00006358mm / a.

Embodiment 2

[0074] Aminotrimethylene phosphonic acid 26.5%

[0075] Hydroxyethylidene diphosphonic acid 2.5%

[0076] Sodium chloride 5.6%

[0077] Polyacrylic acid 3.8%

[0078] Hydrolyzed Polymaleic Acid 1.2%

[0079] Sodium ethylenediamine tetramethylene phosphonate 8.5%

[0080] The rest is water.

[0081] The pH of the raw water is 11, and 30mg / L of scale and corrosion inhibitors are added. The adhesion speed of the copper test tube is 6.12mcm and the corrosion rate is 0.0003365mm / a, and the adhesion speed of the brass test tube is 6.02mcm, and the corrosion rate is 6.02mcm. Speed ​​0.00006183mm / a.

Embodiment 3

[0083] A scale and corrosion inhibitor, consisting of the following components by weight percentage:

[0084] Aminotrimethylene phosphonic acid 28.7%

[0085] Hydroxyethylidene diphosphonic acid 3.3%

[0086] Sodium chloride 6.7%

[0087] Polyacrylic acid 4.2%

[0088] Hydrolyzed Polymaleic Acid 1.6%

[0089] Sodium ethylenediamine tetramethylene phosphonate 9.2%

[0090] The rest is water.

[0091] The pH of the raw water is 11, and 30mg / L of scale and corrosion inhibitors are added. The adhesion speed of the copper test tube is 5.86mcm and the corrosion rate is 0.0002539mm / a, and the adhesion speed of the brass test tube is 5.77mcm, and the corrosion rate is 5.77mcm. Speed ​​0.00004957mm / a.

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PUM

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Abstract

The invention relates to the technical field of corrosion inhibitors, and concretely relates to a scale and corrosion inhibitor. The scale and corrosion inhibitor comprises 25-35wt% of aminotrimethylene phosphonic acid, 2-8wt% of 1-hydroxyethylidene-1,1-diphosphonic acid, 5-10wt% of sodium chloride, 3-8wt% of polyacrylic acid, 1-3wt% of hydrolytic polymaleic acid, 8-15wt% of sodium ethylenediamine tetramethylenephosphonate, and the balance water. The scale and corrosion inhibitor has a substantial effect on circulating water having a wide pH range of 3-11, has a substantial effect on copper tubes and brass tubes, allows the adherence speed and the corrosion speed of copper experiment tubes to be reduced 5.82mcm and 0.0002295mm / a respectively and the adherence speed and the corrosion speed of brass experiment tubes to be reduced to 5.55mcm and 0.00004458mm / a respectively.

Description

technical field [0001] The invention relates to the technical field of corrosion inhibitors, in particular to a scale and corrosion inhibitor. Background technique [0002] The use of circulating water in industry is beneficial to save the cost of enterprises and improve the benefits of enterprises. However, there will be two problems in the process of using circulating water. One is the evaporation of water, which causes the crystallization and precipitation of salts. The most common ones are Calcium carbonate, calcium silicate and other scales, the existence of scales greatly reduces the heat transfer efficiency, and the second is the electrochemical corrosion of circulating water on the equipment. Human life. At present, scale and corrosion inhibitors are added to circulating water to reduce the appearance of scale. However, the current scale and corrosion inhibitors on the market have a single component and the descaling effect is not good, especially for copper, brass p...

Claims

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Application Information

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IPC IPC(8): C02F5/14C23F11/173
Inventor 牟军平于春光
Owner SHANDONG JIANZHU UNIV
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