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Phosphorus-free scale and corrosion inhibitors for circulating cooling water treatment

A circulating cooling water, phosphorus-free scale inhibition technology, applied in the field of scale and corrosion inhibitors, to achieve the effects of easy use, saving fresh water resources, and improving scale and corrosion resistance

Inactive Publication Date: 2011-12-14
天津市科达斯实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a composite scale and corrosion inhibitor for treating circulating cooling water, which can overcome the high concentration of existing composite scale and corrosion inhibitors without using inorganic / organic phosphorus compounds. Phosphorus-free scale and corrosion inhibitors for circulating cooling water treatment due to the disadvantage of adding acid during multiple (≥5) operation

Method used

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  • Phosphorus-free scale and corrosion inhibitors for circulating cooling water treatment
  • Phosphorus-free scale and corrosion inhibitors for circulating cooling water treatment
  • Phosphorus-free scale and corrosion inhibitors for circulating cooling water treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of non-phosphorous scale and corrosion inhibitor-1 for circulating cooling water treatment: 10% polyacrylic acid, 8% tannic acid, 15% polyaspartic acid, 5% borax, 16% octadecyl imidazole Phenol, 5% sodium gluconate, and 41% deionized water are placed in a container and stirred evenly at room temperature to obtain the non-phosphorus scale and corrosion inhibitor of the present invention.

[0024] The phosphorus-free scale and corrosion inhibitor-1 was tested in the tap water of Tianjin, and the water quality is as follows:

[0025]

[0026] Add non-phosphorus scale and corrosion inhibitor-1 agent into the above water quality at 40ppm, when the concentration ratio reaches 3.8 times, the static relative scale inhibition rate is 98.45%; the uniform corrosion rate of A3 carbon steel in the rotating coupon test is 0.0663mm / a The uniform corrosion rate of H62 copper sheet is 0.0032mm / a; the result of dynamic simulation experiment is that the uniform corrosion ra...

Embodiment 2

[0028] Preparation of non-phosphorus scale and corrosion inhibitor-2 for circulating cooling water treatment: 15% polyacrylic acid, 5% tannic acid, 10% polyaspartic acid, 5% borax, 18% octadecyl imidazole Phenol, 4% sodium gluconate, and 43% deionized water are placed in a container and stirred evenly at room temperature to obtain the phosphorus-free scale and corrosion inhibitor of the present invention.

[0029] The agent was tested in the groundwater quality of Tianjin, and the water quality is as follows:

[0030]

[0031] Add the non-phosphorus scale and corrosion inhibitor-2 agent to the above water quality at 40ppm, when the concentration ratio reaches 3.8 times, the static relative scale inhibition rate is 98.45%; the uniform corrosion rate of A3 carbon steel in the rotating coupon test is 0.0663mm / a The uniform corrosion rate of H62 copper sheet is 0.0032mm / a; the result of dynamic simulation experiment is that the uniform corrosion rate of A3 carbon steel is 0.046...

Embodiment 3

[0033] Preparation of non-phosphorous scale and corrosion inhibitor-3 for circulating cooling water treatment: 12% polyacrylic acid, 18% tannic acid, 18% polyaspartic acid, 8% borax, 10% heptadecylimidazole Phosphate, 10% octadecyl imidazoline, 5% sodium gluconate, and 19% deionized water are placed in a container at room temperature and stirred evenly to obtain the phosphorus-free scale and corrosion inhibitor of the present invention.

[0034] The phosphorus-free scale and corrosion inhibitor-2 was tested in the water quality of Haihe River in Tianjin. The water quality is as follows:

[0035]

[0036]Add the non-phosphorus scale and corrosion inhibitor-3 agent to the above water quality at 40ppm, when the concentration ratio reaches 3.2 times, the static relative scale inhibition rate is 98.10%; the uniform corrosion rate of A3 carbon steel in the rotating coupon test is 0.0883mm / a The uniform corrosion rate of H62 copper sheet is 0.0042mm / a; the result of dynamic simula...

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Abstract

A phosphorus-free scale and corrosion inhibitor for circulating cooling water treatment. The phosphorus-free scale inhibition and corrosion inhibitor comprises a scale inhibition component, corrosion inhibition component and deionized water. The scale inhibition component accounts for 16-40% of a total amount of the phosphorus-free scale and corrosion inhibitor, and the corrosion inhibition component accounts for 18-48% of the total amount of the phosphorus-free scale and corrosion inhibitor, and the remaining is the deionized water. The scale inhibition component consists of polyacrylic acidaccounting for 5-15% of the total amount of the phosphorus-free scale and corrosion inhibitor, polyaspartic acid accounting for 8-20% of the total amount of the phosphorus-free scale and corrosion inhibitor and sodium gluconate accounting for 3-5% of the total amount of the phosphorus-free scale and corrosion inhibitor. The corrosion inhibition component consists of tannic acid accounting for 5-20% of the total amount of the phosphorus-free scale and corrosion inhibitor, borax accounting for 5-20% of the total amount of the phosphorus-free scale and corrosion inhibitor, and imidazoline derivative accounting for 10-20% of the total amount of the phosphorus-free scale and corrosion inhibitor, wherein the imidazoline derivative is an alkyl imidazoline including one or two of heptadecyl imidazoline and octadecylselyl imidazoline. The phosphorus-free scale and corrosion inhibitor of the invention has advantages of simple preparation, convenient usage, small application amount and low coasts, and is conducive to reduction of circulating water operating costs and reinforcement of circulating water management.

Description

technical field [0001] The invention relates to a scale and corrosion inhibitor. In particular, it relates to a phosphorus-free scale and corrosion inhibitor for circulating cooling water treatment. Background technique [0002] In recent years, with the rapid growth of the national economy, many basic industries have also achieved considerable development, such as energy, steel, oil refining, large chemical industry, etc., which has led to a significant increase in industrial water consumption year by year, of which cooling water accounts for a large proportion , some departments even as high as 90%. Therefore, how to make use of high technology, give full play to the advantages of scientific research, effectively and rationally save water and protect water resources from pollution is one of the urgent issues to be solved in the rapid economic development. [0003] In the open circulating cooling water system, the cooling water heats up after heat exchange, then cools dow...

Claims

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Application Information

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IPC IPC(8): C02F5/12
Inventor 龚秋鸣张建刘志厉明蓉田慧茹周若
Owner 天津市科达斯实业有限公司
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