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Composit scale and corrosion inbibitor for circular cooling wate treatment

A scale and corrosion inhibitor, cooling water technology, applied in water/sludge/sewage treatment, descaling and water softening, chemical instruments and methods, etc., to improve scale and corrosion resistance, save fresh water resources, and simplify operations program effect

Inactive Publication Date: 2006-05-17
天津市科达斯实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a composite scale and corrosion inhibitor for treating circulating cooling water, so as to overcome the disadvantage that the existing composite scale and corrosion inhibitor needs to add acid when operating at a high concentration ratio (≥5).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of compounding agent: 16.0% of L-aspartic acid, 18.0% of phosphonylated polymaleic anhydride, 7.6% of acrylic acid-acrylate copolymer, 0.7% of sodium humate, 1.4% of benzotri Azole, 9.0% HEDP, 10.0% sodium hydroxide and 37.3% deionized water are placed in a container and stirred evenly at a room temperature of 20°C to obtain the composite scale and corrosion inhibitor of the present invention.

[0019] Experiments were carried out under the following water quality conditions: Ca 2+ 92.32mg / L, Cl - 115.38mg / L, SO 4 2- 85.2mg / L, total alkalinity 105.63mg / L, conductivity 980μs / cm, pH 8.2, total solid solution 695mg / L.

[0020] Put 50ppM of the above composite scale and corrosion inhibitor into the above water quality, when the concentration ratio reaches 6.13, the static scale inhibition rate reaches 98.86%; the corrosion rate of A3 steel is 0.045mm / a, and the corrosion rate of H68 steel is 0.0016mm / a; The dynamic simulation experiment results show that the...

Embodiment 2

[0022] Preparation of composite agent: 19.0% tyrosine, 6.0% phosphonylated polymaleic anhydride, 8.6% acrylic acid-acrylate copolymer, 1.2% potassium humate, 1.0% benzotriazole, 8.0% HEDP, 12.0% sodium hydroxide and 44.2% deionized water are placed in a container at room temperature of 20°C and stirred evenly to obtain the composite scale and corrosion inhibitor of the present invention.

[0023] Experiments were carried out under the following water quality conditions: Ca 2+ 130.24mg / L, Cl - 203.78mg / L, SO 4 2- 106.70mg / L, total alkalinity 212.27mg / L, conductivity 1420μs / cm, pH 8.2, total solid solution 958mg / L.

[0024] Put 50ppM of the above composite scale and corrosion inhibitor into the above water quality, when the concentration ratio reaches 5.08, the static scale inhibition rate reaches 94.62%; the corrosion rate of A3 steel is 0.072mm / a, and the corrosion rate of H68 steel is 0.0029mm / a; The dynamic simulation experiment results show that the corrosion rate of A3...

Embodiment 3

[0026] Preparation of composite agent: 25.0% glycine, 8.0% phosphonylated polymaleic anhydride, 6.6% acrylic acid-acrylate copolymer, 1.0% sodium humate, 1.6% benzotriazole, 12.0% PBTC, 8.0% sodium hydroxide and 37.3% deionized water are placed in a container at a room temperature of 20°C and stirred evenly to obtain the composite scale and corrosion inhibitor of the present invention.

[0027] Experiments were carried out under the following water quality conditions: Ca 2+ 87.50mg / L, Cl- 163.40mg / L, SO 4 2- 86.25mg / L, total alkalinity 168.62mg / L, conductivity 890μs / cm, pH 7.96, total solid solution 634mg / L.

[0028] Put 50ppM of the above composite scale and corrosion inhibitor into the above water quality, when the concentration ratio reaches 6.48, the static scale inhibition rate reaches 99.68%; the corrosion rate of A3 steel is 0.046mm / a, and the corrosion rate of H68 steel is 0.0017mm / a; The dynamic simulation experiment results show that the corrosion rate of A3 steel...

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Abstract

The present invention relates to one kind of composite scale and corrosion inhibitor suitable for circular cooling water with high concentration multiple. The composite scale and corrosion inhibitor consists of amino acid 15-30 wt%, phosphonyl maleic anhydride polymer 5-20 wt%, acrylic acid-acrylate copolymer 5-15 wt%, humate 0.5-2.0 wt%, benzotriazole 0.5-2.0 wt%, organic phosphonate 5-15 wt% and hydroxide 8-15 wt%, except deionized water.

Description

Technical field: [0001] The invention relates to a water treatment agent, in particular to a composite scale and corrosion inhibitor for treating circulating cooling water. Background technique: [0002] As we all know, my country is a country that is very scarce in fresh water resources. In some places, not only industrial water resources are very tight, but also civil water resources are also very short. Due to the tight water supply, the development of many projects has been restricted. In industry, industrial circulating cooling water is a major water user. Whether it is chemical industry, metallurgy, thermal power generation or large-scale central air-conditioning, circulating water is used for heat exchange. Therefore, improving the use efficiency of industrial or civil circulating water will save water resources and reduce Production costs and enhanced environmental protection are of great significance. [0003] After the early direct discharge of circulating water ...

Claims

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Application Information

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IPC IPC(8): C02F5/10
Inventor 龚秋鸣赵艳辉史建公盛铭钧
Owner 天津市科达斯实业有限公司
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