A high-efficiency corrosion inhibitor composition suitable for deep treatment of recycled water, a corrosion inhibitor made therefrom and a preparation method thereof

Abstract

The application discloses a high-efficiency corrosion inhibitor composition suitable for deep treatment of recycled water, a corrosion inhibitor made of the composition and a preparation method of the corrosion inhibitor. The high-efficiency corrosion inhibitor composition comprises the following components: 2-phosphonic-1,2,4-tricarboxylic acid butane, hydroxyethylidene diphosphonic acid, acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, benzotriazole, sodium molybdate, zinc sulfate monohydrate, sodium hydroxymethyl cellulose, polyethylene glycol octylphenyl ether and methacrylic acid, which are combined with water to configure the high-efficiency corrosion inhibitor. Compared with existing corrosion inhibitors, the high-efficiency corrosion inhibitor has simple formula components and obvious synergistic effect; is a low-phosphorus formula, can better protect the water environment; has stable product performance and has the effects of scale inhibition and sterilization; and can be suitable for other low-hardness and low-alkalinity strong corrosive water.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, specifically relating to a highly efficient corrosion inhibitor composition suitable for deep treatment of reclaimed water, a corrosion inhibitor made therefrom, its preparation method, and its application. Background Technology

[0002] With the rapid development of industry, the demand for water is increasing daily, and the need for sustainable development is becoming increasingly urgent. Achieving near-zero wastewater discharge is an important component of sustainable development, which not only helps protect the environment but also conserves water resources, providing a guarantee for the long-term development of industrial production. Therefore, the deep treatment and reuse of wastewater generated in the production process, and the use of deeply treated reverse osmosis permeate as makeup water for circulating water systems, are increasingly attracting attention.

[0003] Currently, more and more companies are beginning to conduct advanced treatment of industrial wastewater in order to achieve near-zero discharge. With the commissioning of zero-discharge facilities, the source of water after advanced treatment is also increasing. After membrane concentration treatment, the alkalinity and hardness of this water are very low, but the chloride ion content is high. This water is extremely corrosive, and long-term use of this water source will cause irreversible corrosion problems to the circulating water system. Summary of the Invention

[0004] To address the problems arising from the large-scale replenishment of deeply treated reclaimed water into circulating water systems, and the current technical limitations of existing corrosion inhibitors such as high dosage and insufficient inhibitory effect, this invention provides a highly efficient corrosion inhibitor suitable for deeply treated reclaimed water. This inhibitor exhibits excellent corrosion inhibition performance, forming a protective film on heat exchange equipment, ensuring the corrosion inhibition rate of circulating water during operation, and significantly reducing corrosion of the equipment.

[0005] According to one aspect of the present invention, a highly efficient corrosion inhibitory composition suitable for deep-treated reclaimed water is provided, comprising the following components: 2-phospho-1,2,4-tricarboxylate butane, hydroxyethylidene diphosphonic acid, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, benzotriazole, sodium molybdate, zinc sulfate monohydrate, sodium hydroxymethyl cellulose, polyethylene glycol octylphenyl ether, and methacrylic acid.

[0006] In some embodiments, the corrosion inhibitor composition according to the present invention comprises the following components:

[0007] 5 to 18 parts by weight of 2-phospho-1,2,4-tricarboxylate, for example, 8 parts by weight, 10 parts by weight, 13 parts by weight, 15 parts by weight, etc.

[0008] Hydroxyethylidene diphosphate, 1 to 5 parts by weight, for example, 2 parts by weight, 3 parts by weight, 4 parts by weight, etc.

[0009] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 10 to 30 parts by weight, for example, 15 parts by weight, 20 parts by weight, 25 parts by weight, 28 parts by weight, etc.

[0010] Benzotriazole, 0.5 to 3 parts by weight, for example, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, etc.

[0011] Sodium molybdate, 1 to 10 parts by weight, for example, 3 parts by weight, 5 parts by weight, 7 parts by weight, 8 parts by weight, etc.

[0012] Zinc sulfate monohydrate, 1 to 10 parts by weight, for example, 2 parts by weight, 3 parts by weight, 5 parts by weight, 8 parts by weight, etc.

[0013] Sodium carboxymethyl cellulose, 5-10 parts by weight, for example, 6 parts by weight, 8 parts by weight, 9 parts by weight, etc.

[0014] 1 to 3 parts by weight of polyethylene glycol octylphenyl ether, for example, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, etc.

[0015] 3 to 10 parts by weight of methacrylic acid, for example, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, etc.

[0016] In some embodiments, the corrosion inhibitor composition according to the present invention comprises the following components:

[0017] 8-18 parts by weight of 2-phospho-1,2,4-tricarboxylate butane.

[0018] 2-5 parts by weight of hydroxyethylidene diphosphate

[0019] 20-30 parts by weight of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer

[0020] Benzotriazole 0.5–2 parts by weight,

[0021] 3-8 parts by weight of sodium molybdate

[0022] 2-8 parts by weight of zinc sulfate monohydrate

[0023] 5-10 parts by weight of sodium carboxymethyl cellulose

[0024] 2-3 parts by weight of polyethylene glycol octylphenyl ether

[0025] 3 to 7 parts by weight of methacrylic acid.

[0026] In one embodiment, the corrosion-inhibiting composition according to the present invention comprises the following components:

[0027] 10 parts by weight of 2-phospho-1,2,4-tricarboxylate butane.

[0028] 2 parts by weight of hydroxyethylidene diphosphate

[0029] 20 parts by weight of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer

[0030] 1 part by weight of benzotriazole

[0031] 5 parts by weight of sodium molybdate

[0032] 5 parts by weight of zinc sulfate monohydrate

[0033] 8 parts by weight of sodium carboxymethyl cellulose

[0034] 2 parts by weight of polyethylene glycol octylphenyl ether

[0035] 7 parts by weight of methacrylic acid.

[0036] According to another aspect of the present invention, a highly efficient corrosion inhibitor is provided, which, based on the total amount of the corrosion inhibitor, is made of the following components in weight percentage:

[0037] 2-Phospho-1,2,4-tricarboxylate butane 5–18%, for example, 8%, 10%, 13%, 15%, etc.

[0038] Hydroxyethylidene diphosphate 1-5%, for example 2%, 3%, 4%, etc.

[0039] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 10-30%, for example, 15%, 20%, 25%, 28%, etc.

[0040] Benzotriazole 0.5-3%, for example, 1%, 1.5%, 2%, 2.5%, etc.

[0041] Sodium molybdate 1-10%, for example 3%, 5%, 7%, 8%, etc.

[0042] Zinc sulfate monohydrate 1-10%, for example, 2%, 3%, 5%, 8%, etc.

[0043] Sodium carboxymethyl cellulose 5-10%, for example, 6%, 8%, 9%, etc.

[0044] Polyethylene glycol octylphenyl ether 1-3%, for example, 1.5%, 2%, 2.5%, etc.

[0045] Methacrylic acid 3-10%, for example 4%, 5%, 6%, 7%, 8%, etc.

[0046] The remaining amount of deionized water.

[0047] More preferably, in some embodiments, the corrosion inhibitor according to the invention is made of the following components by weight percentage, based on the total amount of the corrosion inhibitor:

[0048] 2-Phospho-1,2,4-tricarboxylate butane 8–18%,

[0049] Hydroxyethylidene diphosphate 2-5%,

[0050] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 20-30%,

[0051] Benzotriazole 0.5-2%,

[0052] Sodium molybdate 3-8%,

[0053] Zinc sulfate monohydrate 2-8%,

[0054] Sodium hydroxymethyl cellulose 5-10%,

[0055] 2-3% polyethylene glycol octylphenyl ether

[0056] 3-7% methacrylic acid

[0057] The remainder is deionized water.

[0058] More preferably, in some embodiments, the corrosion inhibitor according to the invention is made from the following components by weight percentage, based on the total amount of the corrosion inhibitor: 8-12% 2-phospho-1,2,4-tricarboxylate, 2-4% hydroxyethylidene diphosphonate, 15-25% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1-2% benzotriazole, 5-8% sodium molybdate, 5-8% zinc sulfate monohydrate, 6-8% sodium carboxymethyl cellulose, 2-3% polyethylene glycol octylphenyl ether, 6-8% methacrylic acid, and the balance being deionized water.

[0059] More preferably, in one embodiment, the high-efficiency corrosion inhibitor according to the present invention is made from the following raw materials in weight percentages: 10% 2-phospho-1,2,4-tricarboxylate, 2% hydroxyethylidene diphosphonic acid, 20% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1% benzotriazole, 5% sodium molybdate, 5% zinc sulfate monohydrate, 8% sodium carboxymethyl cellulose, 2% polyethylene glycol octylphenyl ether, 7% methacrylic acid, and the balance being deionized water.

[0060] In the high-efficiency corrosion inhibitor according to the present invention, zinc sulfate monohydrate is a cathodic inhibition type corrosion inhibitor. In water, zinc ions can react with hydroxide ions generated by the cathodic reaction to form an insoluble zinc hydroxide precipitate film that covers the cathode, thereby inhibiting the cathodic reaction. Sodium molybdate promotes the transformation of active rust to stable rust (Fe2O3) on the metal surface and generates stable molybdenum trioxide (MoO3) and ferric molybdate (FeMoO4), thus forming a dense protective film on the metal surface. This film can prevent external harmful substances from eroding the metal surface, thereby inhibiting the further spread of corrosion. 2-Phospho-1,2,4-tricarboxylate butane and hydroxyethylidene diphosphate can form complexes with metal ions, thereby inhibiting the corrosion of the metal surface. When the metal surface is attacked by oxides, acids, or other corrosive substances, the phosphate ions in them react with the metal... The complexes formed by ion bonding stably cover the metal surface, preventing further corrosion. Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer has good dispersing properties, preventing the deposition of zinc salts, iron salts, etc., and enabling the formation of a uniform protective film on the metal surface. Benzotriazole can chemically adsorb onto the metal surface and subsequently form an adsorption film with metal oxides. Sodium hydroxymethyl cellulose has many hydroxyl groups with excellent adsorption properties; the cellulose protective film formed on the metal surface can prevent corrosion of both the anode and cathode. Methacrylic acid is adsorbed through carbon-carbon double bonds and carboxyl functional groups, coordinating with metal chemical bonds to form a stable chemical bond structure that inhibits corrosion. Polyethylene glycol octylphenyl ether can clean the metal surface and improve the corrosion inhibition effect of other corrosion inhibitors. Therefore, the components in the formulation described in this invention have a significant synergistic effect.

[0061] According to another aspect of the present invention, a method for preparing the aforementioned high-efficiency corrosion inhibitor is provided, comprising: sequentially adding weighed deionized water, 2-phospho-1,2,4-tricarboxylate butane, hydroxyethylidene diphosphonic acid, and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer to a beaker, stirring, then sequentially adding sodium hydroxymethyl cellulose, polyethylene glycol octylphenyl ether, and methacrylic acid, and during stirring, sequentially adding sodium molybdate and zinc sulfate monohydrate, stirring evenly, and finally adding benzotriazole, and allowing it to stand to obtain the aforementioned high-efficiency corrosion inhibitor.

[0062] According to another aspect of the present invention, the highly efficient corrosion inhibitor is provided for use in the deep treatment of recycled water.

[0063] Specifically, when replenishing the circulating cooling water with deep-treated reclaimed water, the highly efficient corrosion inhibitor can be directly added to the circulating water system, and the amount of the highly efficient corrosion inhibitor added is 50-200 mg / L.

[0064] Compared with existing corrosion inhibitors, the present invention has the following positive and beneficial effects:

[0065] (1) The formulation of the high-efficiency corrosion inhibitor is simple and has a significant synergistic effect;

[0066] (2) The high-efficiency corrosion inhibitor is a low-phosphorus formulation, which can better protect the aquatic environment;

[0067] (3) The high-efficiency corrosion inhibitor product has stable performance and has the effects of scale inhibition and bactericidal effect;

[0068] (4) The high-efficiency corrosion inhibitor can be applied to other highly corrosive waters with low hardness and low alkalinity. Detailed implementation method:

[0069] The present invention will be further described below with reference to embodiments, but these embodiments do not limit the implementation of the present invention.

[0070] Unless otherwise specified, the raw materials, reagents, equipment, and methods used in this invention are all from conventional sources in the art, and are conventionally used equipment and methods.

[0071] 2-Phospho-1,2,4-tricarboxylate butane, hydroxyethylidene diphosphonic acid, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, benzotriazole, sodium molybdate, zinc sulfate monohydrate, and methacrylic acid were purchased from Hebei Longke Water Treatment Co., Ltd.

[0072] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer was purchased from Hebei Longke Water Treatment Co., Ltd., with a molecular weight of 2000-4000;

[0073] Sodium carboxymethyl cellulose was purchased from Renqiu Beifang Chemical Co., Ltd.

[0074] Polyethylene glycol octylphenyl ether was purchased from Shandong Xinwei Chemical Technology Co., Ltd.

[0075] The corrosion inhibitor in the example is prepared as follows: Weighed deionized water, 2-phospho-1,2,4-tricarboxylate butane, hydroxyethylidene diphosphonic acid, and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer are added to a beaker in sequence. Then, sodium hydroxymethyl cellulose, polyethylene glycol octylphenyl ether, and methacrylic acid are added in sequence. During stirring, sodium molybdate and zinc sulfate monohydrate are added in sequence. After stirring evenly, benzotriazole is added and allowed to stand to obtain a high-efficiency corrosion inhibitor suitable for deep treatment of recycled water.

[0076] The corrosion inhibitors in the comparative example are prepared in basically the same way as above, except that certain components are not added.

[0077] The rotating plate test is based on GB / T 18175-2014 - Determination of corrosion inhibition performance of water treatment by rotating plate method.

[0078] The experimental water quality was as follows: conductivity 276 μs / cm, turbidity 3.2 NTU, calcium hardness (as CaCO3) 4 mg / L, total alkalinity (as CaCO3) 55 mg / L, chloride ion 61 mg / L, and pH 7.21.

[0079] Example

[0080] Example 1

[0081] The weight percentages of each raw material are as follows: 10% 2-phospho-1,2,4-tricarboxylate, 2% hydroxyethylidene diphosphonic acid, 20% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1% benzotriazole, 5% sodium molybdate, 5% zinc sulfate monohydrate, 8% sodium hydroxymethyl cellulose, 2% polyethylene glycol octylphenyl ether, 7% methacrylic acid, and the balance being deionized water.

[0082] The prepared high-efficiency corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0083] Example 2

[0084] The weight percentages of each raw material are as follows: 13% 2-phospho-1,2,4-tricarboxylate, 4% hydroxyethylidene diphosphonic acid, 25% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 0.5% benzotriazole, 8% sodium molybdate, 2% zinc sulfate monohydrate, 5% sodium hydroxymethyl cellulose, 1% polyethylene glycol octylphenyl ether, 4% methacrylic acid, and the balance being deionized water.

[0085] The prepared high-efficiency corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0086] Example 3

[0087] The weight percentages of each raw material are as follows: 8% 2-phospho-1,2,4-tricarboxylate, 5% hydroxyethylidene diphosphonic acid, 28% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 2% benzotriazole, 8% sodium molybdate, 3% zinc sulfate monohydrate, 8% sodium hydroxymethyl cellulose, 3% polyethylene glycol octylphenyl ether, 3% methacrylic acid, and the balance being deionized water.

[0088] The prepared high-efficiency corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0089] Example 4

[0090] The weight percentages of each raw material are as follows: 18% 2-phospho-1,2,4-tricarboxylate, 5% hydroxyethylidene diphosphonic acid, 30% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 2% benzotriazole, 3% sodium molybdate, 8% zinc sulfate monohydrate, 10% sodium hydroxymethyl cellulose, 1% polyethylene glycol octylphenyl ether, 5% methacrylic acid, and the balance being deionized water.

[0091] The prepared high-efficiency corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0092] Comparative Example 1

[0093] A comparative test was conducted using traditional corrosion inhibitor A; the weight percentage of the formulation components was: 15% hydroxyethylidene diphosphate, 30% polymaleic acid, 1% benzotriazole, 5% zinc sulfate monohydrate, and the remainder was deionized water;

[0094] The prepared high-efficiency corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0095] Comparative Example 2

[0096] A comparative test was conducted using traditional corrosion inhibitor B; the weight percentage of the formulation components was: sodium hexametaphosphate 10%, hydroxyethylidene diphosphate 10%, sodium polyacrylate 25%, benzotriazole 2%, zinc sulfate monohydrate 8%, and the balance was deionized water;

[0097] The prepared high-efficiency corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0098] Comparative Example 3

[0099] This comparative example is identical to Example 1 except that sodium hydroxymethyl cellulose and methacrylic acid are not added. The weight percentages of each component are as follows: 10% 2-phospho-1,2,4-tricarboxylate, 2% hydroxyethylidene diphosphonic acid, 20% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1% benzotriazole, 5% sodium molybdate, 5% zinc sulfate monohydrate, 2% polyethylene glycol octylphenyl ether, and the balance is deionized water.

[0100] The prepared corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0101] Comparative Example 4

[0102] This comparative example is identical to Example 2 except that sodium molybdate and methacrylic acid are not added. The weight percentages of each raw material are as follows: 13% 2-phospho-1,2,4-tricarboxylate, 4% hydroxyethylidene diphosphonic acid, 25% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 0.5% benzotriazole, 2% zinc sulfate monohydrate, 5% sodium carboxymethyl cellulose, 1% polyethylene glycol octylphenyl ether, and the balance being deionized water.

[0103] The prepared corrosion inhibitor was directly added to the experimental water for a rotating plate experiment. The concentrations added were 50 mg / L, 100 mg / L and 200 mg / L, and the test time was 72 h. The experimental results are shown in Table 1.

[0104] Table 1 Corrosion test results of the present invention and traditional corrosion inhibitors

[0105]

[0106] As shown in Table 1 above, the high-efficiency corrosion inhibitor of this invention, applicable to deep-treated reclaimed water, exhibits excellent corrosion inhibition effects when applied to circulating water treatment systems that supplement deep-treated reclaimed water. Specifically, the high-efficiency corrosion inhibitor provided by this invention achieves a corrosion inhibition rate of over 97% and a corrosion rate as low as 0.0006. Furthermore, this high-efficiency corrosion inhibitor is suitable for circulating water systems that supplement deep-treated reclaimed water, requires low dosage, is low in cost, and has a wide applicable water temperature range, ensuring full compliance with the requirements of GB / T 50050-2017 Industrial Circulating Cooling Water Treatment Design Specification. This corrosion inhibitor is characterized by high performance, low phosphorus, non-toxicity, and environmental friendliness, making it worthy of widespread application. Comparative Examples 1 and 2, which used traditional corrosion inhibitors, had corrosion inhibition rates below 86% and corrosion rates between 0.0966 and 0.1471 mm / a, exceeding the requirements of GB / T 50050-2017 Industrial Circulating Cooling Water Treatment Design Specification. Comparative Examples 3 and 4, which omitted certain components of this invention, had the highest corrosion inhibition rate of 88.27% and corrosion rates between 0.0757 and 0.2090 mm / a, also exceeding the requirements of GB / T 50050-2017 Industrial Circulating Cooling Water Treatment Design Specification.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A corrosion-inhibiting composition comprising the following components: 8-18 parts by weight of 2-phospho-1,2,4-tricarboxylate butane. 2-5 parts by weight of hydroxyethylidene diphosphate 20-30 parts by weight of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer Benzotriazole 0.5–2 parts by weight, 3-8 parts by weight of sodium molybdate 2-8 parts by weight of zinc sulfate monohydrate 5-10 parts by weight of sodium carboxymethyl cellulose 2-3 parts by weight of polyethylene glycol octylphenyl ether 3 to 7 parts by weight of methacrylic acid.

2. The corrosion inhibitor composition according to claim 1, comprising the following components: 10 parts by weight of 2-phospho-1,2,4-tricarboxylate butane. 2 parts by weight of hydroxyethylidene diphosphate 20 parts by weight of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 1 part by weight of benzotriazole 5 parts by weight of sodium molybdate 5 parts by weight of zinc sulfate monohydrate 8 parts by weight of sodium carboxymethyl cellulose 2 parts by weight of polyethylene glycol octylphenyl ether 7 parts by weight of methacrylic acid.

3. A corrosion inhibitor, wherein, Based on the total amount of corrosion inhibitor, the corrosion inhibitor is made from the following components by weight percentage: 2-Phospho-1,2,4-tricarboxylate butane 8-18%, Hydroxyethylidene diphosphate 2-5%, Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 20-30%, Benzotriazole 0.5-2%, Sodium molybdate 3-8%, Zinc sulfate monohydrate 2-8%, Sodium hydroxymethyl cellulose 5-10%, 2-3% polyethylene glycol octylphenyl ether 3-7% methacrylic acid The remainder is deionized water.

4. The corrosion inhibitor according to claim 3, wherein, Based on the total amount of corrosion inhibitor, the corrosion inhibitor is made from the following components by weight percentage: 8-12% 2-phospho-1,2,4-tricarboxylate, 2-4% hydroxyethylidene diphosphonic acid, 15-25% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1-2% benzotriazole, 5-8% sodium molybdate, 5-8% zinc sulfate monohydrate, 6-8% sodium hydroxymethyl cellulose, 2-3% polyethylene glycol octylphenyl ether, 6-8% methacrylic acid, with the balance being deionized water.

5. The corrosion inhibitor according to claim 3, wherein, Based on the total amount of corrosion inhibitor, the corrosion inhibitor is made from the following components by weight percentage: 10% 2-phospho-1,2,4-tricarboxylate, 2% hydroxyethylidene diphosphonic acid, 20% acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1% benzotriazole, 5% sodium molybdate, 5% zinc sulfate monohydrate, 8% sodium hydroxymethyl cellulose, 2% polyethylene glycol octylphenyl ether, 7% methacrylic acid, with the balance being deionized water.

6. The method for preparing the corrosion inhibitor according to any one of claims 3 to 5, wherein, The method includes: sequentially adding deionized water, 2-phospho-1,2,4-tricarboxylate butane, hydroxyethylidene diphosphonic acid, and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer into a beaker, stirring, then sequentially adding sodium hydroxymethyl cellulose, polyethylene glycol octylphenyl ether, and methacrylic acid, and during stirring, sequentially adding sodium molybdate and zinc sulfate monohydrate, stirring evenly, and finally adding benzotriazole, and allowing it to stand to obtain the final product.

7. The corrosion inhibitor according to any one of claims 3 to 5 is used for the deep treatment of recycled water.

8. The application according to claim 7, wherein, When replenishing the circulating cooling water with deep-treated reclaimed water, the corrosion inhibitor is directly added to the circulating water system, and the amount of corrosion inhibitor added is 50-200 mg / L.

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