Scale and corrosion inhibitor

A scale and corrosion inhibitor, the technology of weight percentage, applied in the field of scale and corrosion inhibitor, can solve the problems of harm to human life, single component, poor scale removal effect, etc., to achieve the effect of increasing the corrosion rate

Inactive Publication Date: 2014-03-26
山东华亚环保科技有限公司
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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, but the current scale and corrosion inhibitors on the market have a single component, and the descaling effect is not good, especially for the most common calcium carbonate, etc. Not good, it's a deficiency of existing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The scale and corrosion inhibitor consists of the following components by weight percentage:

[0051] Aminotrimethylene phosphonic acid 30%

[0052] Hydroxyethylidene diphosphonic acid 15%

[0053] Sodium Epoxidized Alkyl Carboxylate 20%-

[0054] polyacrylic acid 3

[0055] Hydrolyzed polymaleic acid 1

[0056] The rest is water.

[0057] The raw water calcium hardness (calculated as calcium carbonate) is 295mg / L, and 30mg / L of scale and corrosion inhibitors are added. The adhesion speed of the carbon steel experimental tube is 6.29mcm and the corrosion speed is 0.018mm / a through the monitoring of the heat exchanger. The corrosion rate of stainless steel is 0.0001021mm / a.

Embodiment 2

[0059] The scale and corrosion inhibitor consists of the following components by weight percentage:

[0060] Aminotrimethylene phosphonic acid 33.5%

[0061] Hydroxyethylidene diphosphonic acid 17.6%

[0062] Epoxidized Sodium Alkyl Carboxylate 23.2%

[0063] Polyacrylic acid 3.5%

[0064] Hydrolyzed Polymaleic Acid 1.5%

[0065] The rest is water.

[0066] The calcium hardness of the raw water (calculated as calcium carbonate) is 295mg / L, and 30mg / L of scale and corrosion inhibitors are added. The adhesion speed of the carbon steel test tube is 6.10mcm and the corrosion speed is 0.01025mm / a, monitored by the heat exchanger. The corrosion rate of stainless steel is 0.0000921mm / a.

Embodiment 3

[0068] The scale and corrosion inhibitor consists of the following components by weight percentage:

[0069] Aminotrimethylene phosphonic acid 35.8%

[0070] Hydroxyethylidene diphosphonic acid 18.3%

[0071] Epoxidized Sodium Alkyl Carboxylate 26.7%

[0072] Polyacrylic acid 4.2%

[0073] Hydrolyzed Polymaleic Acid 2.4%

[0074] The rest is water.

[0075] The calcium hardness of the raw water (calculated as calcium carbonate) is 295mg / L, and 30mg / L of scale and corrosion inhibitors are added. The adhesion speed of the carbon steel test tube is 5.86mcm and the corrosion speed is 0.00938mm / a through the monitoring of the heat exchanger. The corrosion rate of stainless steel is 0.0000903mm / a.

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Abstract

The invention relates to the technical field of corrosion inhibitors, particularly a scale and corrosion inhibitor which is composed of the following components in percentage by weight: 30-40% of amino trimethylene phosphonic acid, 15-20% of hydroxyethidene diphosphoric acid, 20-30% of sodium epoxy alkylcarboxylate, 1-3% of polyacrylic acid, 1-3% of hydrolytic polymaliec acid and the balance of water. The scale and corrosion inhibitor has obvious action on circulating water with high calcium content, the adhesion rate of the carbon steel experiment tube is lowered to 5.75mcm, and the corrosion rates for carbon steel and stainless steel are obviously enhanced, wherein the corrosion rate for carbon steel is lowered to 0.00901mm / a, and the corrosion rate for stainless steel is lowered to 0.0000891mm / a.

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, but the current scale and corrosion inhibitors on the market have a single component, and the descaling effect is not good, especially for the most common cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14C02F5/10
Inventor 牟军平刘晓
Owner 山东华亚环保科技有限公司
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