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Corrosion inhibitor for recirculated cooling water

A technology of circulating cooling water and corrosion inhibitor, which is applied in the fields of descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc. Poor synergy, environmental pollution and other problems, to achieve the effect of strengthening corrosion inhibition, avoiding corrosion, and improving corrosion inhibition

Inactive Publication Date: 2015-07-15
SAE TECH DELEVOPMENT DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these formulations contain high phosphorus content, causing harmful substances to pollute the environment, and the synergy between scale and corrosion inhibition is poor
Another existing corrosion inhibitor adopts molybdate formula to gradually replace phosphate formula and chromate formula. However, the corrosion inhibition effect of a single molybdate is not effective enough, especially with the addition of molybdate Continuously increasing, such as increasing to 1500mg / L, its corrosion inhibition rate will no longer increase, only about 65% to 70%

Method used

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  • Corrosion inhibitor for recirculated cooling water
  • Corrosion inhibitor for recirculated cooling water
  • Corrosion inhibitor for recirculated cooling water

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Effect test

Embodiment 1

[0015] The raw material ratio (by weight) for preparing the corrosion inhibitor of the present invention is as follows: 1.5% molybdate, 3% triethanolamine, 8% polyol phosphate (PAPE), 3% dimethyl ketoxime, gluconic acid Sodium 1%, Sodium Salicylate 1.5%, Deionized Water 82%.

[0016] Using the raw materials in the above ratio, the corrosion inhibitor is prepared through the following steps: add the above-mentioned amount of dimethyl ketone oxime to the deionized water containing the above-mentioned amount, and then add the above-mentioned amount of other raw materials into the container and stir evenly, that is Obtain the corrosion inhibitor of the present invention. It has been verified by experiments that when heated to a high temperature of 80 degrees Celsius, the corrosion inhibition rate of this corrosion inhibitor on copper sheets is as high as 83.2%.

[0017] Preferably, the molybdate may be one of sodium molybdate or potassium molybdate, or a mixture of the above two....

Embodiment 2

[0020] The raw material ratio (by weight) for preparing the corrosion inhibitor of the present invention is as follows: 2% molybdate, 4% mixture of triethanolamine and diethanolamine, 13% polyol phosphate (PAPE), dimethyl ketoxime 5%, sodium gluconate 1.5%, sodium salicylate 2%, deionized water 72.5%.

[0021] Using the raw materials in the above ratio, the corrosion inhibitor is prepared through the following steps: add the above-mentioned amount of dimethyl ketone oxime to the deionized water containing the above-mentioned amount, and then add the above-mentioned amount of other raw materials into the container and stir evenly, that is Obtain the corrosion inhibitor of the present invention. It has been verified by experiments that when heated to a high temperature of 80 degrees Celsius, the corrosion inhibition rate of this corrosion inhibitor on copper sheets is as high as 84%.

Embodiment 3

[0023] The raw material ratio (by weight) for preparing the corrosion inhibitor of the present invention is as follows: 3% sodium molybdate, 8% triethanolamine, 15% polyol phosphate (PAPE), 5% dimethyl ketoxime, gluconic acid Sodium 1%, Sodium Salicylate 1.5%, Deionized Water 66.5%.

[0024] Using the raw materials in the above ratio, the corrosion inhibitor is prepared through the following steps: add the above-mentioned amount of dimethyl ketone oxime to the deionized water containing the above-mentioned amount, and then add the above-mentioned amount of other raw materials into the container and stir evenly, that is Obtain the corrosion inhibitor of the present invention. It has been verified by experiments that when heated to a high temperature of 80 degrees Celsius, the corrosion inhibition rate of this corrosion inhibitor on copper sheets is as high as 88%.

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Abstract

The invention discloses a corrosion inhibitor for recirculated cooling water. The corrosion inhibitor comprises, by weight, 1.5-3% of molybdate, 3-8% of ethanolamine, 8-15% of polyhydric alcohol phosphate ester, 3-7% of dimethyl ketoxime, 1-2% of sodium gluconate, 1-2% of sodium salicylate and the balance deionized water. The corrosion inhibitor has the advantages of good high temperature resistance, high corrosion inhibition efficiency and good scale inhibition capability.

Description

technical field [0001] The invention relates to a corrosion inhibitor used in water treatment, in particular to a corrosion inhibitor used for circulating cooling water. Background technique [0002] In the circulating cooling water system, the cooling water heats up after heat exchange, then cools down through evaporation in the cooling tower, and returns to the system for recycling. However, with the circulation, replenishment or replacement of cooling water, the dissolved oxygen in the water will corrode the circulation pipe, so that the equipment may leak or shorten the service life due to corrosion. Moreover, with the continuous circulation of cooling water, serious scale deposits will appear in the cooling water. Scale is particularly easy to deposit on the heat transfer surface, affecting the normal conduction of heat transfer, consuming and wasting energy. [0003] Traditional scale and corrosion inhibitors include phosphate formula and chromate formula. However, ...

Claims

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Application Information

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IPC IPC(8): C02F5/14C02F5/10
Inventor 陈儒
Owner SAE TECH DELEVOPMENT DONGGUAN
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