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 water/sludge/sewage treatment, special treatment targets, descaling and water softening, etc. Achieve good scale and corrosion inhibition performance, avoid environmental problems, and meet the requirements of scale and corrosion inhibition

Active 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

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

Examples

Experimental program
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Example Embodiment

[0025] The preparation method of the copolymer used in the present invention may include: mixing monomers, initiators and molecular weight modifiers at 50-95°C, and then continuing to react at 75-95°C for 1-4 hours, wherein the monomer The body includes thiourea derivatives, unsaturated carboxylic acids and acrylates.

[0026] Among them, the amount and specific selection of thiourea derivatives, unsaturated carboxylic acids and acrylates as monomers are as described above, and will not be repeated here.

[0027] According to a preferred embodiment, the method of mixing when preparing the copolymer is:

[0028] (a) Drop the monomer solution and the initiator solution into the molecular weight regulator solution, or

[0029] (b) Drop the monomer solution and the molecular weight regulator solution into the initiator solution, or

[0030] (c) Drop the solution of the initiator into the mixed solution of the molecular weight modifier and the monomer.

[0031] In the mixing mode (a), (b) or...

Example Embodiment

[0072] Example 1

[0073] Weigh 30g sodium carboxymethyl inulin (degree of substitution is 1), 10g carboxymethyl-α-cyclodextrin and 30g copolymer 1 (limiting viscosity at 30℃ is 0.078dl / g, sodium metabisulfite 7.2g dissolved In 20ml water, 1.2g ammonium persulfate is dissolved in 40ml water, monomer 24.5g allyl thiourea, 18g methylene succinic acid, 18g methyl acrylate and 100ml water are polymerized, and the solid content is 29.4% by weight), Add 30g of water and shake well to obtain composite scale and corrosion inhibitor stock solution S1.

[0074] Take 1g of the prepared composite scale and corrosion inhibitor stock solution S1 and add 10L of test water 1 and 2, respectively, so that the contents of sodium carboxymethyl inulin, carboxymethyl-α-cyclodextrin and copolymer are 6mg respectively / L, 10mg / L and 9mg / L, and then measure the calcium carbonate scale inhibition performance and corrosion inhibition performance according to the method in Test Example 1.

Example Embodiment

[0075] Example 2

[0076] Weigh 3.14g zinc chloride and dissolve it in 15g copolymer 2 (the limit viscosity is 0.078dl / g at 30℃, 2.4g ammonium persulfate is dissolved in 40ml water, 6g sodium metabisulfite is dissolved in 20ml water, monomer propylene sulfur 27.6g of urea, 21g of maleic anhydride, 12g of ethyl acrylate and 100ml of water were polymerized to obtain a solid content of 30.1% by weight), and then 45g of sodium carboxymethyl inulin (degree of substitution 0.6) and 18g of methyl-β- Cyclodextrin, then add 8.86g of water, shake well to obtain composite scale and corrosion inhibitor stock solution S2.

[0077] Take 0.9g of the prepared composite scale and corrosion inhibitor stock solution S2 and add 10L test water 1 and 2 respectively to make the content of sodium carboxymethyl inulin, methyl-β-cyclodextrin, copolymer and zinc ion in the water Respectively 9mg / L, 18mg / L, 4.5mg / L and 1.5mg / L, and then in accordance with the method in Test Example 1, the calcium carbonate s...

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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), a structural unit provided by a C3-C10 unsaturated carboxylic acid and a structural unit provided by C4 to C10 acrylate.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 composite anti-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 scaleinhibition 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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IPC IPC(8): C02F5/12C02F5/10C23F11/12C23F11/173
CPCC02F5/10C02F5/12C02F2303/08C23F11/124C23F11/173
Inventor 郦和生秦会敏冯婕
Owner CHINA PETROLEUM & CHEM CORP
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