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Phosphorus-free composite scale and corrosion inhibitor and its application and treatment method of circulating cooling water

A technology of scale and corrosion inhibitors and circulating cooling water, applied in natural water treatment, non-polluted water treatment, water/sludge/sewage treatment, etc., can solve the problem that carboxymethyl inulin is not easily soluble in water, and achieve Good scale and corrosion inhibition performance, meeting the requirements of scale and corrosion inhibition, and avoiding environmental problems

Active Publication Date: 2020-04-07
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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Examples

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preparation example Construction

[0020] 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 then continuing the reaction at 75-95°C (preferably 85-95°C) -4h, wherein the monomer comprises dimethyl diallyl ammonium chloride and an unsaturated carboxylic acid.

[0021] Wherein, the consumption and specific selection of dimethyl diallyl ammonium chloride and unsaturated carboxylic acid as monomers are as mentioned above, and will not be repeated here.

[0022] According to a preferred embodiment, the mixing method when preparing the copolymer is:

[0023] (a) the solution of the monomer and the solution of the initiator are respectively added dropwise to the solution of the molecular weight regulator, or

[0024] (b) adding dropwise the solution of the monomer and the solution of the molecular weight regulator into the solution of the initiator respectively, or

[0025] (c) The solution of the initiator i...

Embodiment 1

[0067] Weigh 30g sodium carboxymethylinulin (degree of substitution is 1), 10g carboxymethyl-α-cyclodextrin and 30g copolymer 1 (the limiting viscosity at 30°C is 0.078dl / g, which is the initiator ammonium persulfate 6g was dissolved in 60mL of water, 1.2g of molecular weight modifier sodium metabisulfite was dissolved in 40mL of water, obtained by polymerization of 33.3g of monomer dimethyl diallyl ammonium chloride, 40g of maleic anhydride and 10mL of water, and the solid content was 29.4% by weight) , add 30g of water, and shake well to obtain the stock solution S1 of compound scale and corrosion inhibitor agent.

[0068] 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 mea...

Embodiment 2

[0070]Weigh 3.14g of zinc chloride, dissolve it in 15g of copolymer 2 (at 30°C, the limiting viscosity is 0.078dl / g, 7.2g of ammonium persulfate is dissolved in 60mL of water, 2.4g of sodium metabisulfite is dissolved in 40mL of water, the monomer dimethyl Diallyl ammonium chloride 50g, methacrylic acid 30g and 10mL water polymerization, solid content is 30.1% by weight), then add 45g sodium carboxymethylinulin (substitution degree is 0.6) and 18g methyl-β -Cyclodextrin, then add 8.86g of water and shake well to obtain the stock solution S2 of composite scale and corrosion inhibitor agent.

[0071] 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 performance and corrosion inhibition ...

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Abstract

The invention discloses a phosphorus-free composite scale and corrosion inhibitor and application thereof, and a treating method for circulating cooling water, belonging to the field of treatment of circulating cooling water. The phosphorus-free composite scale and corrosion inhibitor contains sodium carboxymethyl inulin, a cyclodextrin derivative and a copolymer, wherein the copolymer contains a constitutional unit provided by dimethyldiallylammonium chloride and a constitutional unit provided by C3-10 unsaturated carboxylic acid. The invention also provides application of the phosphorus-free composite scale and corrosion inhibitor to treatment of circulating cooling water. The treating method for circulating cooling water comprises a step of adding the phosphorus-free composite scale and corrosion inhibitor into circulating cooling water. The phosphorus-free composite scale and corrosion inhibitor provided by the invention presents good comprehensive scale and corrosion inhibition performance; and when the phosphorus-free composite scale and corrosion inhibitor is applied to treatment of circulating cooling water, requirements of circulating cooling water on scale inhibition and corrosion mitigation are met, and environmental problems caused by conventional phosphorus-containing reagents can be avoided.

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 Patents(China)
IPC IPC(8): C02F5/12C02F103/02
CPCC02F5/12C02F2103/023
Inventor 秦会敏郦和生冯婕谢文州吴颖楼琼慧
Owner CHINA PETROLEUM & CHEM CORP
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