Environment-friendly circulating water scale and corrosion inhibitor as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of scale inhibitors, and particularly relates to an environment-friendly circulating water scale and corrosion inhibitor as well as a preparation method and application thereof. The invention provides an environment-friendly circulating water scale and corrosion inhibitor. The environment-friendly circulating water scale and corrosion inhibitor is prepared from components in percentage by mass as follows: 28%-32% of an AA-AMPS-HPA terpolymer, 38%-42% of polyepoxysuccinic acid, 6%-8% of zinc chloride, 0.6%-1.0% of benzotriazole and the balance of water. The environment-friendly circulating water scale and corrosion inhibitor provided by the invention has relatively high scale and corrosion inhibition efficiency under the combined action of all the components; the scale inhibitor can be applied to an open-type circulating cooling water treatment system under the conditions of high temperature, high pH value, high hardness and high alkali, and has the effects of scale inhibition, corrosion inhibition, inhibition, complexation and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of scale inhibitors, and particularly relates to an environmentally friendly circulating water scale and corrosion inhibitor, a preparation method thereof, and an application thereof. Background Art

[0002] Circulating water is mainly used to condense steam, cool products or equipment in industrial production. If the cooling effect is poor, it will affect production efficiency, reduce the yield and quality of products, and even cause production accidents, playing a crucial role. However, the circulating water used has high strength and alkalinity and has serious scaling characteristics. In various situations where the water temperature is higher than the ambient temperature, the scaling of inorganic salts such as calcium carbonate will bring serious consequences. When used as a circulating medium in an industrial circulating water system, it will cause water quality deterioration, problems such as corrosion and scaling, resulting in blockage or leakage of heat exchange equipment and its pipelines, seriously affecting the normal operation of production devices. At present, the phenomenon of scaling is mainly slowed down by adding scale inhibitors to the circulating water.

[0003] Organic phosphonic acids are widely used in the field of circulating water treatment due to their good thermal stability, hydrolysis resistance, and excellent scale inhibition performance, such as in industries such as power, chemical, food, and metallurgy. However, with the improvement of environmental protection requirements, there are currently many restrictions on the use of organic phosphine scale inhibitors in circulating water systems, especially strict requirements for the phosphorus emissions in sewage. Therefore, developing low-phosphorus or phosphorus-free and environmentally friendly scale inhibitors has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In view of this, the present invention provides an environmentally friendly circulating water scale and corrosion inhibitor, a preparation method thereof, and an application thereof. The environmentally friendly circulating water scale and corrosion inhibitor provided by the present invention does not contain phosphine and has good environmental protection. At the same time, the environmentally friendly circulating water scale and corrosion inhibitor provided by the present invention has a high scale inhibition efficiency. Under the combined action of each component, the environmentally friendly circulating water scale and corrosion inhibitor play roles such as scale inhibition, corrosion inhibition, inhibition, and complexation in an open-circuit circulating cooling water treatment system under high temperature, high pH, high hardness, and high alkalinity conditions.

[0005] In order to solve the above technical problems, the present invention provides an environmentally friendly circulating water scale and corrosion inhibitor, which comprises the following components in mass percentage: 28 - 32% of AA-AMPS-HPA terpolymer, 38 - 42% of polyepoxysuccinic acid, 1 - 8% of zinc chloride, 0.6 - 1.0% of benzotriazole, and the balance of water.

[0006] Preferably, it comprises the following components in mass percentage: 30% of AA-AMPS-HPA terpolymer, 40% of polyepoxysuccinic acid, 6 - 7% of zinc chloride, 0.8 - 0.9% of benzotriazole, and the balance of water.

[0007] The present invention also provides a preparation method of the environmentally friendly circulating water scale and corrosion inhibitor described in the above technical solution, including the following steps:

[0008] Mix the AA-AMPS-HPA terpolymer, polyepoxysuccinic acid, zinc chloride, benzotriazole and water to obtain the environmentally friendly circulating water scale and corrosion inhibitor.

[0009] Preferably, the mixing includes the following steps:

[0010] Dissolve benzotriazole in polyepoxysuccinic acid to obtain a mixed solution;

[0011] First mix the mixed solution, AA-AMPS-HPA terpolymer, zinc chloride and water to obtain the environmentally friendly circulating water scale and corrosion inhibitor.

[0012] Preferably, the mixing time is 2 to 4 hours.

[0013] The present invention also provides the application of the environmentally friendly circulating water scale and corrosion inhibitor described in the above technical solution or the environmentally friendly circulating water scale and corrosion inhibitor prepared by the preparation method described in the above technical solution in an open recirculating cooling water treatment system.

[0014] The present invention provides an environmentally friendly circulating water scale and corrosion inhibitor, including the following components in mass percentage: 28-32% AA-AMPS-HPA terpolymer, 38-42% polyepoxysuccinic acid, 6-8% zinc chloride, 0.6-1.0% benzotriazole and the balance water. The environmentally friendly circulating water scale and corrosion inhibitor provided by the present invention has a high scale inhibition efficiency under the combined action of each component; it can be applied in an open recirculating cooling water treatment system under high temperature, high pH value, high hardness and high alkali conditions, and plays roles such as scale inhibition, corrosion inhibition, inhibition and complexation. Brief Description of the Drawings

[0015] Figure 1 It is a schematic flow chart for preparing the environmentally friendly circulating water scale and corrosion inhibitor in the examples. Detailed Embodiments

[0016] The present invention provides an environmentally friendly circulating water scale and corrosion inhibitor, including the following components in mass percentage: 28-32% AA-AMPS-HPA terpolymer, 38-42% polyepoxysuccinic acid, 6-8% zinc chloride, 0.6-1.0% benzotriazole and the balance water.

[0017] In the present invention, all raw materials are conventional commercially available products if not otherwise specified.

[0018] In the present invention, by mass percentage, the environmentally friendly circulating water scale and corrosion inhibitor comprises 28 - 32% of AA-AMPS-HPA terpolymer, preferably 30%. In the present invention, the molecular chain of the AA-AMPS-HPA terpolymer contains strong acid, weak acid and non-ionic groups simultaneously, and has a high calcium tolerance under high temperature, high pH, high hardness and high alkalinity conditions, and has excellent inhibitory effect and dispersion performance on the deposition of dirt such as calcium carbonate, calcium phosphate, zinc scale, iron oxide and sediment in water.

[0019] In the present invention, by mass percentage, the environmentally friendly circulating water scale and corrosion inhibitor comprises 38 - 42% of polyepoxysuccinic acid, preferably 40% of polyepoxysuccinic acid. In the present invention, the polyepoxysuccinic acid has good scale inhibition and dispersion performance on calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate, calcium fluoride and silica scale in water, and has good synergistic effect when combined with the terpolymer. PESA has biodegradability and can achieve high-concentration operation when applied to cooling water systems under high alkalinity, high hardness and high pH conditions.

[0020] In the present invention, by mass percentage, the environmentally friendly circulating water scale and corrosion inhibitor comprises 6 - 8% of zinc chloride, preferably 6 - 7%. In the present invention, the zinc chloride is preferably battery-grade zinc chloride. In the present invention, the zinc chloride has the characteristics of dissolving metal oxides and cellulose, and zinc ions can quickly form a zinc hydroxide precipitation protective film in the high pH value area at the cathode part.

[0021] In the present invention, by mass percentage, the environmentally friendly circulating water scale and corrosion inhibitor comprises 0.6 - 1.0% of benzotriazole, preferably 0.8 - 0.9%. In the present invention, the benzotriazole (BTA) forms covalent bonds and coordination bonds with metal atoms, and mutually substitutes to form a chain polymer, forming a multi-layer protective film on the surface of the metal, so that the surface of the metal does not undergo oxidation-reduction reaction and does not generate hydrogen, playing an anti-corrosion role.

[0022] In the present invention, by mass percentage, the environmentally friendly circulating water scale and corrosion inhibitor comprises the balance of water. There are no special requirements for the water in the present invention, and ordinary water can be selected.

[0023] The present invention also provides a preparation method of the environmentally friendly circulating water scale and corrosion inhibitor according to the above technical solution, comprising the following steps:

[0024] Mix the AA-AMPS-HPA terpolymer, polyepoxysuccinic acid, zinc chloride, benzotriazole and water to obtain the environmentally friendly circulating water scale and corrosion inhibitor.

[0025] In the present invention, the mixing preferably comprises the following steps:

[0026] Dissolve benzotriazole in polyepoxysuccinic acid to obtain a mixed solution;

[0027] First mix the mixed solution, AA-AMPS-HPA terpolymer, zinc chloride and water to obtain the environmentally friendly circulating water scale and corrosion inhibitor.

[0028] In the present invention, the dissolution is preferably carried out under stirring, the rotation speed of the stirring is preferably 60-90 r / min, more preferably 70-80 r / min; the stirring time is preferably 1-2 h, more preferably 1-1.5 h.

[0029] In the present invention, the first mixing is preferably carried out under stirring, the rotation speed of the stirring is preferably 70-80 r / min, more preferably 75-80 r / min; the stirring time is preferably 1-3 h, more preferably 1.5-2 h.

[0030] In the present invention, the sum of the stirring time of the dissolution and the stirring time of the first mixing is preferably 2-5 h, more preferably 2.5-3.5 h.

[0031] Figure 1 It is a schematic flow chart for preparing the environmentally friendly circulating water scale and corrosion inhibitor in the embodiment. Specifically, add benzotriazole to the first mixer, and then use the feed pump to transport polyepoxysuccinic acid to the first mixer for stirring to obtain a mixed solution; use the transfer pump to transport the mixed solution to the second mixer, and at the same time use the feed pump to transport the AA-AMPS-HPA terpolymer and water to the second mixer, add zinc chloride to the second mixer for stirring, and use the discharge pump to transport the prepared environmentally friendly circulating water scale and corrosion inhibitor to the storage container.

[0032] The present invention also provides the application of the environmentally friendly circulating water scale and corrosion inhibitor described in the above technical solution or the environmentally friendly circulating water scale and corrosion inhibitor prepared by the preparation method described in the above technical solution in an open recirculating cooling water system. In the present invention, the addition amount of the circulating water scale and corrosion inhibitor can increase with the increase of different concentration multiples. When the concentration multiple is 2.5-6 times, the dosage is 20 ppm-50 ppm.

[0033] In order to further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below in conjunction with embodiments, but they cannot be understood as limiting the protection scope of the present invention.

[0034] The present invention does not limit the weight of the raw material dosage in the embodiment, as long as the required mass percentage content can be achieved.

[0035] Example 1

[0036] Benzotriazole was stirred for 1.5 h at a rotation speed of 75 r / min and dissolved in polyepoxysuccinic acid to obtain a mixed solution;

[0037] The mixed solution, AA-AMPS-HPA terpolymer, battery-grade zinc chloride and water were stirred for 2.5 h for the first mixing to obtain an environmentally friendly circulating water scale and corrosion inhibitor, wherein the mass percentage content of polyepoxysuccinic acid was 38%, the mass percentage content of AA-AMPS-HPA terpolymer was 30%, the mass percentage content of zinc chloride was 7%, and the mass percentage content of benzotriazole was 0.8%.

[0038] Example 2

[0039] The environmentally friendly circulating water scale and corrosion inhibitor was prepared according to the method of Example 1, except that the mass percentage content of polyepoxysuccinic acid was 40%, the mass percentage content of AA-AMPS-HPA terpolymer was 32%, the mass percentage content of zinc chloride was 7%, and the mass percentage content of benzotriazole was 1.0%.

[0040] Comparative Example 1

[0041] The environmentally friendly circulating water scale and corrosion inhibitor was prepared according to the method of Example 1, except that the mass percentage content of polyepoxysuccinic acid was 35%, the mass percentage content of AA-AMPS-HPA terpolymer was 25%, the mass percentage content of zinc chloride was 7%, and the mass percentage content of benzotriazole was 1.0%.

[0042] Comparative Example 2

[0043] The environmentally friendly circulating water scale and corrosion inhibitor was prepared according to the method of Example 1, except that the mass percentage content of polyepoxysuccinic acid was 30%, the mass percentage content of AA-AMPS-HPA terpolymer was 38%, the mass percentage content of zinc chloride was 4%, and the mass percentage content of benzotriazole was 0.5%.

[0044] The circulating water scale and corrosion inhibitors of Example 1, 2 and Comparative Examples 1, 2 were used to treat the circulating water of a chemical plant in Inner Mongolia. The Ca 2+ concentration of this circulating water was 820 mg / L, the alkalinity concentration was 360 mg / L, and the Cl- concentration was 850 mg / L, belonging to high-hardness and high-chlorine water quality. The dosing concentration of the agent was 35 ppm (calculated based on the make-up water volume), and the test results of the treatment are listed in Table 1.

[0045] Table 1 Performance of the circulating water scale and corrosion inhibitors of Example 1, 2 and Comparative Examples 1, 2

[0046]

[0047]

[0048] As can be seen from the above table, the corrosion and scale inhibitors provided in Example 1 and Example 2 have good corrosion and scale inhibition effects and are applicable to high-hardness and high-chlorine water quality.

[0049] Although the above embodiments have made a detailed description of the present invention, they are only a part of the embodiments of the present invention, rather than all embodiments. People can also obtain other embodiments based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. An environmentally friendly circulating water scale and corrosion inhibitor, characterized in that, Comprising components with the following mass percentages: 28-32% AA-AMPS-HPA terpolymer, 38-42% polyepoxysuccinic acid, 1-8% zinc chloride, 0.6-1.0% benzotriazole, and the balance being water.

2. The environmentally friendly circulating water scale and corrosion inhibitor according to claim 1, wherein Comprising components with the following mass percentages: 30% AA-AMPS-HPA terpolymer, 40% polyepoxysuccinic acid, 6-7% zinc chloride, 0.8-0.9% benzotriazole, and the balance being water.

3. The preparation method of the environmentally friendly circulating water scale and corrosion inhibitor according to claim 1 or 2, comprising the following steps: Mixing the AA-AMPS-HPA terpolymer, polyepoxysuccinic acid, zinc chloride, benzotriazole, and water to obtain the environmentally friendly circulating water scale and corrosion inhibitor.

4. The preparation method according to claim 3, characterized in that, The mixing comprises the following steps: Dissolving benzotriazole in polyepoxysuccinic acid to obtain a mixed solution; First mixing the mixed solution, AA-AMPS-HPA terpolymer, zinc chloride, and water to obtain the environmentally friendly circulating water scale and corrosion inhibitor.

5. The preparation method according to claim 3, wherein The mixing time is 2-4 h.

6. The application of the environmentally friendly circulating water scale and corrosion inhibitor according to claim 1 or 2 or the environmentally friendly circulating water scale and corrosion inhibitor prepared by the preparation method according to any one of claims 3-5 in an open recirculating cooling water treatment system.

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