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Efficient environment-friendly scale-inhibiting corrosion inhibitor and preparation thereof

A scale and corrosion inhibitor, an environmentally friendly technology, applied in the direction of scale removal and water softening, special treatment targets, water/sludge/sewage treatment, etc., can solve the single and poor treatment effect of scale and corrosion inhibitors , secondary environmental pollution and other issues, to achieve the effect of low raw material cost, good scale inhibition effect, and low dosage

Inactive Publication Date: 2017-10-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sewage discharge will cause a large amount of phosphorus to be discharged into natural water bodies, resulting in eutrophication of water bodies, thus causing secondary environmental pollution
In addition, the treatment effect of traditional scale and corrosion inhibitors is relatively single. Traditional scale and corrosion inhibitors can only inhibit calcium phosphate scale in calcium carbonate scale, calcium sulfate scale, or the treatment effect is not good.

Method used

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  • Efficient environment-friendly scale-inhibiting corrosion inhibitor and preparation thereof
  • Efficient environment-friendly scale-inhibiting corrosion inhibitor and preparation thereof
  • Efficient environment-friendly scale-inhibiting corrosion inhibitor and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation process of chitosan copolymer derivatives: first add 3g of chitosan, then add 1g of formaldehyde solution with a mass fraction of 30% as an inducer, and then oil bath for 1h at a temperature of 80°C, then add 12g of thiourea, continue Temperature-controlled oil bath for 2 hours to obtain chitosan copolymer derivatives.

[0029] 50g high-efficiency and environment-friendly scale and corrosion inhibitors; take 5g of chitosan copolymer derivatives, 8.2g of hydrolyzed polymaleic anhydride, 4.2g of 2-acrylamide-2-methylpropanesulfonic acid, 5g of zinc chloride, and distilled water for 27.6 g. Put them into the Erlenmeyer flask successively according to the above order and carry out stirring control, the pH is 6, the stirring time is 3h, the temperature is controlled at 35°C, and the aging is 2h. Wait until the mixture is clear and free of insoluble impurities.

Embodiment 2

[0031] The preparation process of chitosan copolymer derivatives: first add 3.5g of chitosan, then add 1g of formaldehyde solution with a mass fraction of 30% as an inducer, and then add 11.5g of thiourea in an oil bath for 2h at a temperature of 85°C , and continue to control the temperature of the oil bath for 2.5 hours, thereby obtaining the chitosan copolymer derivative.

[0032] 50g high-efficiency and environment-friendly scale and corrosion inhibitor: take 6g of chitosan copolymer derivatives, 8.2g of hydrolyzed polymaleic anhydride, 4.2g of 2-acrylamide-2-methylpropanesulfonic acid, 5g of zinc sulfate, and 26.6 g of distilled water g. Put them into the Erlenmeyer flask successively for stirring according to the above sequence, control the pH to 6.5, stir for 2.5 hours, control the temperature at 40°C, and age for 2 hours. Wait until the mixture is clear and free of insoluble impurities.

Embodiment 3

[0034] The preparation process of chitosan copolymer derivatives: (1) first add 4g of chitosan, then add 1g of formaldehyde solution with a mass fraction of 40% as an inducer, and then add 15g of sulfur in an oil bath for 2.5h at a temperature of 90°C Urea, oil bath for 2h, so as to obtain chitosan copolymer derivatives.

[0035] 50g high-efficiency and environment-friendly scale and corrosion inhibitor: take 7g of chitosan copolymer derivatives, 8.2g of hydrolyzed polymaleic anhydride, 4.3g of 2-acrylamide-2-methylpropanesulfonic acid, 5.3g of zinc sulfate, distilled water 25.2g was added to the Erlenmeyer flask according to the above sequence and stirred, the pH was controlled to be 7, the stirring time was 3h, the temperature was controlled to be 30°C, and aging was carried out for 2.5h. Wait until the mixture is clear and free of insoluble impurities.

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Abstract

The invention relates to an efficient environment-friendly scale-inhibiting corrosion inhibitor and a preparation method thereof. The efficient environment-friendly scale-inhibiting corrosion inhibitor consists of the following components in percentage by weight: 13 to 18 percent of hydrolytic polymaleic anhydride, 7 to 10 percent of an acrylic acid copolymer, 10 to 16 percent of chitosan copolymerization derivatives, 9 to 12 percent of zinc salt and the balance of distilled water. The efficient environment-friendly scale-inhibiting corrosion inhibitor prepared with the method has small dosing quantity and good scale inhibition effect. Tests prove that after the efficient environment-friendly scale-inhibiting corrosion inhibitor is adopted, the annual corrosion rate is less than 0.03 mm.a<-1>, the calcium carbonate scale-inhibiting rate reaches above 98 percent, the calcium phosphate scale-inhibiting rate reaches above 95 percent, and the calcium sulfate scale-inhibiting rate reaches above 96 percent.

Description

technical field [0001] The invention relates to a high-efficiency and environment-friendly phosphorus-free corrosion and scale inhibitor, which can effectively reduce the corrosion and scaling of industrial circulating water cooling water on pipelines, thereby protecting the circulating cooling water system. Background technique [0002] With the rapid development of social economy, the demand for industrial water continues to increase, but the scaling and corrosion of pipeline equipment have restricted industrial production. The circulating cooling water is forced to evaporate through the water tower to take away the heat, but as the circulating cooling water continues to concentrate and evaporate, various harmful ions will continue to enrich, and the dust and microorganisms in the air will accumulate in the circulating water. The form of mud adheres to the pipe wall of the waterway system, and harmful ions (Ca 2+ , Mg 2+ , HCO 3 - If the concentration exceeds the satur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
CPCC02F5/125C02F2303/08
Inventor 曾德芳肖静曾旭潘能志
Owner WUHAN UNIV OF TECH