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Phosphorus-free composite anti-scaling corrosion inhibitor and application thereof and treatment method of circulating cooling water

A technology of scale and corrosion inhibitor, circulating cooling water, applied in natural water treatment, non-polluting water treatment, water/sludge/sewage treatment, etc. The effect of good scale and corrosion inhibition performance, avoiding environmental problems, and meeting the requirements of scale and corrosion inhibition

Inactive Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, carboxymethyl inulin is not easily soluble in water, and there is no existing literature on the corrosion inhibition performance of carboxymethyl inulin and its application in circulating cooling water to form a composite corrosion and scale inhibitor compounded with other phosphorus-free polymer water treatment agents Reports processed

Method used

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  • Phosphorus-free composite anti-scaling corrosion inhibitor and application thereof and treatment method of circulating cooling water
  • Phosphorus-free composite anti-scaling corrosion inhibitor and application thereof and treatment method of circulating cooling water
  • Phosphorus-free composite anti-scaling corrosion inhibitor and application thereof and treatment method of circulating cooling water

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preparation example Construction

[0024] The preparation method of the copolymer used in the present invention may include: mixing monomers, initiators and molecular weight regulators at 50-95°C, and continuing to react at 75-95°C for 1-4h, wherein the monomer Examples include thiourea derivatives and dimethyldiallylammonium chloride.

[0025] Wherein, the dosage and specific selection of the thiourea derivatives and dimethyldiallylammonium chloride as monomers are as mentioned above, and will not be repeated here.

[0026] According to a preferred embodiment, the mixing method when preparing the copolymer is:

[0027] (a) adding dropwise the solution of the monomer and the solution of the initiator respectively to the solution of the molecular weight regulator, or

[0028] (b) adding dropwise the solution of the monomer and the solution of the molecular weight modifier respectively to the solution of the initiator, or

[0029] (c) The solution of the initiator is added dropwise to the mixed solution of the ...

Embodiment 1

[0072] Weigh 30g of sodium carboxymethylinulin (substitution degree is 1), 10g of carboxymethyl-α-cyclodextrin and 30g of copolymer 1 (at 30°C, the limiting viscosity is 0.098dl / g, which is dissolved in 6g of sodium metabisulfite. In 20ml of water, 1.2g of ammonium persulfate was dissolved in 60ml of water, obtained by polymerization of 30.7g of monomer allylthiourea, 50g of dimethyl diallyl ammonium chloride and 55ml of water, and the solid content was 29.7% by weight), adding Shake well in 30g of water to obtain the stock solution S1 of the composite scale and corrosion inhibitor agent.

[0073] Take 1g of the prepared composite scale and corrosion inhibitor stock solution S1 and add them to 10L of test water 1 and 2 respectively, so that the contents of carboxymethylinulin sodium, carboxymethyl-α-cyclodextrin and copolymer in the water are respectively 6mg / L, 10mg / L and 9mg / L, then carry out the calcium carbonate scale inhibition performance measurement and the corrosion i...

Embodiment 2

[0075] Weigh 3.14g of zinc chloride, dissolve in 15g of copolymer 2 (at 30°C, the limiting viscosity is 0.088dl / g, 2.4g of ammonium persulfate is dissolved in 20ml of water, 3.6g of sodium metabisulfite is dissolved in 50ml of water, monomer propylene 33.7g of thiourea, 45g of dimethyl diallyl ammonium chloride and 65ml of water are polymerized, and the solid content is 30.2% by weight), and then 45g of sodium carboxymethylinulin (substitution degree of 0.6) and 18g of formazan are added base-β-cyclodextrin, then add 8.86g of water, shake well, and obtain the composite scale and corrosion inhibitor stock solution S2.

[0076] Take 0.9g of the prepared composite scale and corrosion inhibitor stock solution S2 and add them to 10L of test water 1 and 2 respectively, so that the content of sodium carboxymethylinulin, methyl-β-cyclodextrin, copolymer and zinc ions in the water 9mg / L, 18mg / L, 4.5mg / L and 1.5mg / L respectively, and then the calcium carbonate scale inhibition performan...

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Abstract

The invention relates to the field of circulating cooling water treatment, and discloses a phosphorus-free composite anti-scaling corrosion inhibitor and application thereof and a treatment method ofcirculating cooling water. The phosphorus-free composite anti-scaling corrosion inhibitor contains carboxymethyl inulin sodium, a cyclodextrin derivative and a copolymer. The copolymer comprises a structural unit provided by a thiourea derivative represented by the formula (I) and a structural unit provided by dimethyl diallyl ammonium chloride. The application is the application of the phosphorus-free composite anti-scaling corrosion inhibitor in treatment of the circulating cooling water; the treatment method of the circulating cooling water includes addition of the phosphorus-free compositeanti-scaling corrosion inhibitor into the circulating cooling water. The phosphorus-free composite anti-scaling corrosion inhibitor exhibits good comprehensive performance of scale inhibition and corrosion inhibition, and when applied to the circulating cooling water, can not only meet the requirements of the circulating cooling water for scale inhibition and corrosion inhibition, but also can avoid the environmental problems caused by phosphorus-containing agents in the prior art.

Description

technical field [0001] The invention relates to the field of circulating cooling water treatment, in particular to a phosphorus-free composite scale and corrosion inhibitor, its application and a treatment method for circulating cooling water. Background technique [0002] In the circulating cooling water system, there are mainly scaling and corrosion problems. In order to prevent system scaling and corrosion, the most convenient and effective method is to add corrosion and scale inhibitors to the circulating cooling water. However, during the use of cooling water, with the continuous circulation and concentration, the mineral content in the water will continue to increase, which will intensify the corrosion and scaling of pipes and equipment. Therefore, it is necessary to add corrosion and scale inhibitors to improve the quality of cooling water and ensure The equipment operates safely. These chemicals will eventually be released into the environment as waste. However, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F5/10C02F1/56C02F103/02
CPCC02F5/12C02F1/56C02F5/10C02F2103/023C02F2303/08C02F2303/22
Inventor 秦会敏郦和生冯婕
Owner CHINA PETROLEUM & CHEM CORP
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