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Phosphorus-free composite scale and corrosion inhibitor and application thereof, and treating method for circulating cooling water

A scale and corrosion inhibitor, circulating cooling water technology, applied in water/sludge/sewage treatment, special treatment targets, descaling and water softening, etc., can solve the problem that carboxymethyl inulin is not easily soluble in water, etc. Achieve good scale and corrosion inhibition performance, avoid environmental problems, and meet the requirements of scale and corrosion inhibition

Active Publication Date: 2017-12-29
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

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] 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 (preferably 85-95°C) 1 -4h, wherein the monomer includes dimethyl diallyl ammonium chloride, unsaturated carboxylic acid and acrylate.

[0021] Among them, the amount and specific selection of dimethyl diallyl ammonium chloride, unsaturated carboxylic acid and acrylate as monomers are as described above, and will not be repeated here.

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

[0023] (a) Drop the monomer solution and the initiator solution into the molecular weight regulator solution, or

[0024] (b) Drop the monomer solution and the molecular weight regulator solution into the initiator solution, or

[0025] (c) The solution of the initiator is added dropwise to the mixed solution of the molecular weight regulator and the monomer...

Embodiment 1

[0067] Weigh 30g sodium carboxymethyl inulin (degree of substitution is 1), 10g carboxymethyl-α-cyclodextrin and 30g copolymer 1 (the limiting viscosity at 30℃ is 0.078dl / g, which is the initiator ammonium persulfate 4.8g dissolved in 80mL water, 3.6g molecular weight regulator sodium metabisulfite dissolved in 50mL water, monomer dimethyl diallyl ammonium chloride 10g, methyl acrylate 6g, acrylic acid 48g and 25mL water are polymerized. The solid content is 30.1 Weight %), add 30 g of water, shake well to obtain composite scale and corrosion inhibitor stock solution S1.

[0068] 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 ...

Embodiment 2

[0070] Weigh 3.14g zinc chloride and dissolve it in 15g copolymer 1, then add 45g sodium carboxymethyl inulin (degree of substitution 0.6) and 18g methyl-β-cyclodextrin, then add 8.86g water, shake well , Get the composite scale and corrosion inhibitor stock solution S2.

[0071] 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 scale inhibition performance measurement and corrosion inhibition performance measurement.

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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, a constitutional unit provided by C3-10 unsaturated carboxylic acid and a constitutional unit provided by C4-10 acrylate. 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 present invention relates to the field of circulating cooling water treatment, in particular to a phosphorus-free composite scale and corrosion inhibitor and its application as well as a circulating cooling water treatment method. 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 increase the corrosion and scaling of pipelines 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 discharged into the environment as wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10
CPCC02F5/10C02F2303/08C02F2303/22
Inventor 秦会敏郦和生冯婕谢文州楼琼慧吴颖
Owner CHINA PETROLEUM & CHEM CORP
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