A soil preventing agent, a method for preparing the same, and an application thereof

Abstract

The application discloses a kind of scale preventives and preparation method and application thereof;Belong to water treatment agent technical field;Wherein scale preventive has phosphonic acid component;Phosphonic acid component includes at least one of 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, hexanediaminetetramethylene phosphonic acid.The scale preventive prepared by the application can be used to prevent corrosion of metal materials in water system, and can also inhibit the precipitation of inorganic scale in water system.The scale preventive has excellent corrosion and scale inhibition performance, and has high Cl ‑ removal rate, and can be widely applied in circulating cooling water.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water treatment agents, and specifically relates to a scale preventing agent and a preparation method and application thereof. BACKGROUND

[0002] In a circulating system, due to the temperature, speed, pH, dissolved oxygen content, and concentration of inorganic ions of water, more serious deposition adhesion and equipment corrosion occur in the circulating system than in a direct current system. A large number of production practices show that only by taking effective maintenance measures and selecting and adding corresponding scale preventing agents according to the site conditions can the problems of pipeline fouling and corrosion be effectively solved.

[0003] At present, inorganic polyphosphates, organic phosphates, and platinates are widely used as scale preventing agents. It is difficult to achieve the effect of corrosion and scale inhibition by using a single agent, and the use of multiple corrosion and scale inhibition agents for compounding can fully exert the synergistic effect of the multiple agents and achieve better results.

[0004] The prior art CN104230015A discloses a composite slow-release scale inhibitor suitable for a petrochemical wastewater recycling circulating water system; the composite slow-release scale inhibitor is composed of 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, aminotri(methylphosphonic acid), and zinc sulfate; the water quality corrosion inhibition rate is 86.18%, the water quality corrosion inhibition rate is 86.44% in a dynamic simulation experiment on the recycled water of an ethylene plant, and the scale inhibition rate is 87.42%. The corrosion rate has been reduced to 0.0168 mm / a and 0.0091 mm / a, which meets the anti-corrosion requirement of Sinopec that the corrosion rate of circulating cooling water is less than 0.075 mm / a. Compared with the existing polyphosphonate composite slow-release scale inhibitor, the composite slow-release scale inhibitor has the advantages of small addition amount and good corrosion and scale inhibition effect. SUMMARY

[0005] The application aims to provide a scale preventing agent with excellent scale inhibition and corrosion inhibition performance, which can be applied to circulating cooling water with high Cl - concentration and has a high removal rate.

[0006] The technical scheme adopted by the application to achieve the above-mentioned purpose is as follows.

[0007] A scale preventing agent contains a phosphonic acid component.

[0008] The phosphonic acid component includes at least one of 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexanediaminetetramethylene phosphonic acid.

[0009] The phosphonic acid component-containing scale inhibitor prepared by the method has good dispersing performance on barium sulfate, that is, the scale inhibitor has good dispersion stability; the scale inhibitor has excellent scale inhibition performance on circulating water, and can be used in circulating cooling water containing high Cl - concentration, has high Cl - removal rate, and the scale inhibitor has high corrosion inhibition rate.

[0010] Further, in a preferred embodiment, the scale inhibitor contains at least one of carboxylic acid copolymer, polyacrylic acid, polymaleic acid, polyaspartic acid, and polyepoxysuccinic acid.

[0011] Further, in a preferred embodiment, the scale inhibitor contains at least one of hydrochloric acid, phosphoric acid, and sulfuric acid.

[0012] Further, in a preferred embodiment, the scale inhibitor contains at least one of zinc chloride, zinc sulfate, and sodium hexametaphosphate.

[0013] Further, in a preferred embodiment, the scale inhibitor contains at least one of isothiazolinone, methyl benzotriazole, and phenylpropyltriazole.

[0014] The corrosion inhibition rate of the scale inhibitor is higher than 87%.

[0015] The application further provides a use of the scale inhibitor in a circulating cooling water system.

[0016] The pH of water in the water system is 7.5-8.5, the calcium hardness in the water is lower than 1600 mg / L, and the Cl - concentration in the water is lower than 2000 mg / L.

[0017] The scale inhibitor disclosed by the application is added in an amount of 40-180 mg / L in the cooling water.

[0018] The application further discloses a preparation method of the scale inhibitor, which comprises the following steps: placing each component in a container according to a proportion, and mixing uniformly to obtain the scale inhibitor.

[0019] The phosphonic acid component-containing scale inhibitor prepared by the method has good dispersing performance on barium sulfate, that is, the scale inhibitor has good dispersion stability; the scale inhibitor has excellent scale inhibition performance on circulating water, and can be used in circulating cooling water containing high Cl - concentration, has high Cl - removal rate, and the scale inhibitor has high corrosion inhibition rate. - Therefore, the application is a scale inhibitor with excellent scale inhibition and corrosion inhibition performance, and can be applied in circulating cooling water with high Cl Attached Figure Description

[0020] Figure 1 The images show the infrared spectra of gluconic acid before and after modification in Example 4. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to specific embodiments. The given embodiments are merely illustrative of the invention and not intended to limit its scope. The embodiments provided below can serve as a guide for further improvements by those skilled in the art and do not constitute a limitation on the invention in any way.

[0022] Furthermore, in a preferred embodiment, the present invention discloses a fouling inhibitor comprising: polyacrylic acid, polymaleic acid, 2-acrylamide-2-methylpropanesulfonic acid, isothiazolinone, zinc chloride, hydrochloric acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, phosphoric acid, hexamethylenetetramethylenephosphonic acid, sodium hexametaphosphate, methylbenzotriazole, sulfuric acid, benzotriazole, and water.

[0023] Further, in a preferred embodiment, by weight, the following components are present: 3-10 parts polyacrylic acid, 2-8 parts polymaleic acid, 1-6 parts 2-acrylamide-2-methylpropanesulfonic acid, 1-5 parts isothiazolinone, 0.5-1.2 parts zinc chloride, 2-9 parts hydrochloric acid, 10-25 parts 2-phosphonobutane-1,2,4-tricarboxylic acid, 8-15 parts hydroxyethylidene diphosphonic acid, 3-10 parts phosphoric acid, 5-12 parts hexamethylenetetramethylenephosphonic acid, 1-5 parts sodium hexametaphosphate, 1-5 parts methylbenzotriazole, 0.1-0.5 parts sulfuric acid, 2-6 parts benzotriazole, and 30-60 parts water.

[0024] Further, in a preferred embodiment, a method for preparing a fouling inhibitor includes: placing polyacrylic acid, polymaleic acid, 2-acrylamide-2-methylpropanesulfonic acid, isothiazolinone, zinc chloride, hydrochloric acid, phosphoric acid, sodium hexametaphosphate, methylbenzotriazole, sulfuric acid, benzotriazole, phosphonic acid, and water in a container, wherein the phosphonic acid contains PO4. 3- The concentration is 25-30 mg / L. After thorough stirring and mixing, a stain prevention agent is obtained.

[0025] Further, in a preferred embodiment, the phosphonic acid component includes 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylenetetramethylenephosphonic acid; wherein the weight ratio of 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylenetetramethylenephosphonic acid is 1~2:0.5~1.5:0.5~1.

[0026] The present application adopts polyacrylic acid, polymaleic acid, 2-acrylamide-2-methylpropane sulfonic acid, isothiazolinone, zinc chloride, hydrochloric acid, phosphoric acid, sodium hexametaphosphate, methyl benzotriazole, sulfuric acid, benzotriazole, phosphonic acid components (2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, hexamethylene diamine tetramethylene phosphonic acid) and water to prepare the scale inhibitor, which has high scale inhibition rate and corrosion inhibition rate, and also has high Cl - removal rate.

[0027] Further, in a preferred embodiment, a method for preparing the scale inhibitor comprises: placing 3-10 parts of polyacrylic acid, 2-8 parts of polymaleic acid, 1-6 parts of 2-acrylamide-2-methylpropane sulfonic acid, 1-5 parts of isothiazolinone, 0.5-1.2 parts of zinc chloride, 2-9 parts of hydrochloric acid, 3-10 parts of phosphoric acid, 1-5 parts of sodium hexametaphosphate, 1-5 parts of methyl benzotriazole, 0.1-0.5 parts of sulfuric acid, 2-6 parts of benzotriazole, 5-12 parts of phosphonic acid components (the weight ratio of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and hexamethylene diamine tetramethylene phosphonic acid is 1-2:0.5-1.5:0.5-1), and 30-60 parts of water in a container, fully stirring and mixing uniformly to obtain the scale inhibitor.

[0028] In order to further improve the corrosion and scale inhibition performance, the present application also adopts the following measures: adding glucose acid derivative into the scale inhibitor, and the adding amount is 1-4wt% of the scale inhibitor.

[0029] Further, in a preferred embodiment, the glucose acid derivative is prepared by modifying glucose acid with 1H-benzimidazole-2-formaldehyde. The glucose acid derivative prepared by modifying glucose acid with 1H-benzimidazole-2-formaldehyde is used as a component of the scale inhibitor, which further improves the corrosion and scale inhibition performance of the scale inhibitor, and also improves the Cl - removal rate of the scale inhibitor to meet the national use standard.

[0030] Further, in a preferred embodiment, a method for preparing the glucose acid derivative comprises:

[0031] Glucose acid is prepared into a glucose acid solution and placed in a container, methanol and concentrated hydrochloric acid are added, stirred uniformly, then 1H-benzimidazole-2-formaldehyde solution is slowly added, and the reaction is carried out at 5-15℃ for 24-48h. After the reaction is completed, water is added and stirred uniformly, then suction filtration is carried out, neutralization is carried out to neutral, then washing, suction filtration and drying are carried out to obtain the glucose acid derivative.

[0032] Further, in a preferred embodiment, in the method for preparing the gluconic acid derivative, the gluconic acid solution is 15-30 parts by weight, the methanol is 10-20 parts by weight, the concentrated hydrochloric acid is 20-40 parts by weight, the 1H-benzimidazole-2-carboxaldehyde solution is 30-50 parts by weight, and the water is 20-40 parts by weight.

[0033] Further, in a preferred embodiment, the concentration of the gluconic acid solution is 25-50 wt%, and the concentration of the 1H-benzimidazole-2-carboxaldehyde solution is 10-30 wt%.

[0034] The technical solutions of the present application are described in further detail below in combination with specific embodiments:

[0035] Example 1

[0036] A method for preparing a scale inhibitor, comprising: placing 5 parts of polyacrylic acid, 3 parts of polymaleic acid, 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 4 parts of isothiazolinone, 0.8 parts of zinc chloride, 6 parts of hydrochloric acid, 7 parts of phosphoric acid, 10 parts of a phosphonic acid component (wherein the weight ratio of 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylenediaminetetramethylene phosphonic acid is 1:0.5:1), 2 parts of sodium hexametaphosphate, 1 part of methyl benzotriazole, 0.2 parts of sulfuric acid, 4 parts of benzotriazole, and 40 parts of water into a container, and fully stirring and mixing them to obtain the scale inhibitor.

[0037] Example 2

[0038] A method for preparing a scale inhibitor, other steps are the same as those in Example 1, and different from Example 1 is that the scale inhibitor components and their parts by weight comprise: 8 parts of polyacrylic acid, 5 parts of polymaleic acid, 1 part of 2-acrylamido-2-methylpropanesulfonic acid, 3 parts of isothiazolinone, 1 part of zinc chloride, 8 parts of hydrochloric acid, 10 parts of phosphoric acid, 8 parts of hexamethylenediaminetetramethylene phosphonic acid, 3 parts of sodium hexametaphosphate, 2 parts of methyl benzotriazole, 0.3 parts of sulfuric acid, 5 parts of benzotriazole, 8 parts of a phosphonic acid component (wherein the weight ratio of 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylenediaminetetramethylene phosphonic acid is 1:0.5:1), and 50 parts of water.

[0039] Example 3

[0040] A method for preparing a gluconic acid derivative, comprising:

[0041] A D-gluconic acid solution with a concentration of 40 wt% was prepared by dissolving D-gluconic acid in water, 20 parts of the above D-gluconic acid solution was placed in a container, 15 parts of anhydrous methanol and 20 parts of concentrated hydrochloric acid were added, and then mechanically stirred until uniform, followed by slowly adding 40 parts of a 1H-benzimidazole-2-formaldehyde methanol solution with a concentration of 20 wt%, and reacting at 8℃ for 48h, after the reaction was completed, 30 parts of water was added and stirred until uniform, then filtered, the filter cake was neutralized to neutral with pyridine, washed with deionized water for 3 times, then washed with dichloromethane for 3 times, filtered and dried to constant weight to obtain a gluconic acid derivative.

[0042] Example 4

[0043] A method for preparing a scale inhibitor, other steps are the same as those in Example 1, and the difference from Example 1 is that the gluconic acid derivative in Example 4 is added to the scale inhibitor, and the amount of addition is 1 wt% of the scale inhibitor.

[0044] Example 5

[0045] A method for preparing a scale inhibitor, other steps are the same as those in Example 1, and the difference from Example 1 is that the gluconic acid derivative in Example 4 is added to the scale inhibitor, and the amount of addition is 2 wt% of the scale inhibitor.

[0046] Example 6

[0047] A method for preparing a scale inhibitor, other steps are the same as those in Example 1, and the difference from Example 1 is that the gluconic acid derivative in Example 4 is added to the scale inhibitor, and the amount of addition is 4 wt% of the scale inhibitor.

[0048] Example 7

[0049] A method for preparing a scale inhibitor, other steps are the same as those in Example 1, and the difference from Example 1 is that D-gluconic acid is added to the scale inhibitor, and the amount of addition is 2 wt% of the scale inhibitor.

[0050] Example 8

[0051] In order to optimize the performance of the scale inhibitor, the preferred measures adopted by the present application also include: adding 0.5-2.5 wt% of 3-hydroxybutyric acid to the scale inhibitor, which can interact with other components in the scale inhibitor, further improve the corrosion and scale inhibition performance of the scale inhibitor, and at the same time make the scale inhibitor have excellent stability.

[0052] A method for preparing a scale inhibitor, other steps are the same as those in Example 1, and the difference from Example 1 is that 0.5 wt% of 3-hydroxybutyric acid is added to the scale inhibitor.

[0053] Example 9

[0054] A method for preparing a soil preventing agent, other steps are same as example 1, different from example 1 is that 2.5wt% 3-hydroxybutyric acid is added into the soil preventing agent.

[0055] Example 10

[0056] A method for preparing a soil preventing agent, other steps are same as example 5, different from example 5 is that 2.5wt% 3-hydroxybutyric acid is added into the soil preventing agent.

[0057] Test example

[0058] 1. Infrared spectrum test

[0059] The infrared spectrum of gluconic acid before and after modification is tested by using Nicolet IS-10 type Fourier transform infrared spectrum instrument, and the test range is 500-1000cm -1 .

[0060] Figure 1 The infrared spectrum diagram of gluconic acid before and after modification in example 4; curves a, b are gluconic acid and gluconic acid derivative respectively; Figure 1 It can be seen that compared with gluconic acid, the characteristic absorption peak of 3050cm -1 around of gluconic acid derivative is the stretching vibration of benzene ring; the characteristic absorption peak of 1750cm -1 around is the stretching vibration of ester group; the characteristic absorption peak of 1570cm -1 around is the stretching vibration of C-N; which shows that the gluconic acid derivative is prepared by using 1H-benzimidazole-2-formaldehyde to modify gluconic acid.

[0061] 2. Performance test of soil preventing agent

[0062] I. Test of dispersing capacity for barium sulfate

[0063] The dispersing capacity of soil preventing agent for barium sulfate is determined according to the determination method of suspension rate, wherein the amount of soil preventing agent is 120mg / L.

[0064] Table 1 Dispersing capacity of soil preventing agent for barium sulfate

[0065] Sample Suspension rate / % Example 1 92.4 Example 2 93.3 Example 4 95.1 Example 5 96.4 Example 6 95.9 Example 7 93.2 Example 8 95.8 Example 9 96.5 Example 10 98.3

[0066] As can be seen from Table 1, the suspension rates of barium sulfate in the scale inhibitors in Examples 1-2, Examples 4-10 are higher than 92%, which indicates that the scale inhibitors used in the present application have good dispersing capacity for barium sulfate; the suspension rates of barium sulfate in the scale inhibitors in Examples 4-6 are higher than 95%, and compared with Comparative Example 1 and Examples 4-7, the suspension rates of barium sulfate in the scale inhibitors in Examples 4-6 are higher than those in Examples 1 and 7, which indicates that the glucose acid derivative prepared by modifying glucose acid with 1H-benzimidazole-2-formaldehyde is used as a component of the scale inhibitor, which further improves the dispersing capacity of the scale inhibitor for barium sulfate; the suspension rates of barium sulfate in the scale inhibitors in Examples 8-9 are higher than 95%, and the suspension rate of barium sulfate in the scale inhibitor in Example 10 is higher than 98%, and compared with Comparative Example 1 and Examples 6, 8-10, the suspension rates of barium sulfate in the scale inhibitors in Examples 8-9 are higher than that in Example 1, and the suspension rate of barium sulfate in the scale inhibitor in Example 10 is higher than that in Example 6, which indicates that the addition of 3-hydroxybutyric acid to the scale inhibitor improves the dispersing capacity of the scale inhibitor for barium sulfate, and the addition of the glucose acid derivative and 3-hydroxybutyric acid to the scale inhibitor can obviously improve the dispersing capacity of the scale inhibitor for barium sulfate.

[0067] 2. Determination of scale inhibition rate

[0068] The experimental solution was prepared, calcium chloride solution and sodium bicarbonate solution were added in a beaker, the calcium hardness was ≥7500 mg / L in terms of calcium carbonate, 80 mg / L of the scale inhibitor was added into the beaker, the temperature was kept at 70°C, and the beaker was placed in a constant temperature environment for 8 h, then cooled to room temperature, filtered, 50 mL of the filtrate was taken and placed in a conical flask, 10 mL of potassium hydroxide solution and 0.2 g of calcium carboxylic acid indicator were added, and 100 mL of water was added, and the color of the EDTA standard titration solution changed from purple red to bright blue as the end point; the volume of the consumed EDTA was recorded, the experiment was repeated for three times, and the Ca 2+ concentration was calculated.

[0069] A= (V2-V1) / V2 x 100%

[0070] In the formula, V1 is the Ca 2+ concentration in the experimental solution after the scale inhibitor is added, mg / L; and V2 is the Ca 2+ concentration in the prepared experimental solution, mg / L.

[0071] Table 2 Ca 2+ concentration and scale inhibition rate after the scale inhibitor is added

[0072] Sample Ca 2+ Concentration / mg / L Scale inhibition rate / % Example 1 1520 79.7 Example 2 1495 80.1 Example 4 936 87.5 Example 5 908 87.9 Example 6 915 87.8 Example 7 1463 80.5 Example 8 1294 82.7 Example 9 1165 84.5 Example 10 506 93.3

[0073] As can be seen from Table 2, the Ca2+ The concentration is lower than 1600 mg / L, and the scale inhibition rate is higher than 79%, which indicates that the scale inhibitor prepared in the application has excellent scale inhibition performance; the Ca 2+ The concentration is lower than 1000 mg / L, and the scale inhibition rate is higher than 87%, compared with the comparative example 1 and the examples 4-7, the scale inhibition rate of the scale inhibitor in the examples 4-6 is higher than that in the examples 1 and 7, which indicates that the glucose acid derivative prepared by using 1H-benzimidazole-2-formaldehyde to modify glucose acid as a component of the scale inhibitor, further improves the scale inhibition performance of the corrosion and scale inhibition; the Ca 2+ The concentration is lower than 1300 mg / L, and the scale inhibition rate is higher than 82%, the Ca 2+ The concentration is lower than 510 mg / L, and the scale inhibition rate is higher than 93%, compared with the comparative example 1 and the examples 6, 8-10, the scale inhibition rate of the scale inhibitor in the example 10 is higher than that in the example 6, and the scale inhibition rate of the scale inhibitor in the examples 8-9 is higher than that in the example 1, which indicates that the addition of 3-hydroxybutyric acid in the scale inhibitor further improves the scale inhibition performance of the scale inhibitor, and the addition of the glucose acid derivative and 3-hydroxybutyric acid in the scale inhibitor together obviously improves the scale inhibition rate of the scale inhibitor on calcium carbonate to meet the national use standard.

[0074] 3. Chloride ion removal rate determination

[0075] The cooling water index used is: total alkali 600 mg / L, total hardness 400 mg / L, pH 7.5-8.5, Cl - The concentration is 700 mg / L, the concentration multiple K is 10 times, at this time, the Cl - The concentration is 10000 mg / L, then 50 mg / L of the scale inhibitor is added, and maintained for 10 min, and then the Cl - concentration and removal rate in the cooling water are calculated.

[0076] Table 3 Cl - concentration and removal rate after adding the scale inhibitor

[0077] Sample Cl - Concentration / mg / L Removal rate / % Example 1 1710 82.9 Example 2 1660 83.4 Example 4 830 91.7 Example 5 750 92.5 Example 6 680 93.2 Example 7 1310 86.9 Example 8 1240 87.6 Example 9 1370 86.3 Example 10 140 98.6

[0078] As can be seen from Table 3, the Cl - concentration is lower than 2000 mg / L, and the removal rate is higher than 82%, which indicates that the scale inhibitor prepared in the application can be used in the circulating cooling water containing higher Cl - concentration, and has a higher Cl - removal rate; the Cl- concentration lower than 1350 mg / L, Cl - removal rate higher than 87%, comparative example 1 vs. examples 4-7, Cl - removal rate higher than example 1, example 7, which shows that the glucose acid derivative prepared by using 1H-benzimidazole-2-carboxaldehyde to modify glucose acid as the ingredient of the scale inhibitor further improves the corrosion and scale inhibition of Cl - removal rate, so that it has good application in circulating cooling water; Cl - concentration lower than 1400 mg / L, scale inhibition rate higher than 85%, Cl - concentration lower than 150 mg / L, scale inhibition rate higher than 98%, comparative example 1 vs. examples 6, 8-10, Cl

[0079] 4. Corrosion performance determination

[0080] According to the GB / T 18175-2000 standard, the rotating coupon corrosion test method is used for testing. The test environment is: 550 mg / L Cl - , 600 mg / L SO4 2- , 550 mg / L HCO3 - , A carbon steel is used as the test piece, with a size of 60 mm x 30 mm x 5 mm; the scale inhibitor with a concentration of 60 mg / L is added to the simulated circulating water at 75°C, the test piece is placed therein, and the rotating corrosion is carried out at a speed of 100 r / min for 10 h, and then the corrosion inhibition rate is calculated.

[0081] The corrosion rate calculation formula is as follows:

[0082] X = 87600 x (m-m0) / s-p-t

[0083] In the formula: X is the corrosion rate; m is the mass of the test piece before the test, g; m0is the mass of the test piece after the test, g; s is the surface area of the test piece, cm 3 ; p is the density of the test piece, g / cm 3 ; t is the test time, h.

[0084] The corrosion rate calculation formula is as follows:

[0085] R=(X0-X) / X0*100

[0086] In the formula: X0 is the corrosion rate of the test piece without corrosion inhibitor; X is the corrosion rate of the test piece with corrosion inhibitor.

[0087] Table 4 Corrosion rate of scale inhibitor

[0088] Sample Corrosion inhibition rate / % Example 1 87.4 Example 2 88.1 Example 4 91.6 Example 5 92.5 Example 6 92.2 Example 7 88.7 Example 8 89.4 Example 9 90.3 Example 10 96.8

[0089] As can be seen from Table 4, the corrosion rates of Examples 1-2 and Examples 4-10 are higher than 87%, which indicates that the scale inhibitor prepared by the present application has a high corrosion rate in circulating water; the corrosion rates of Examples 4-6 are higher than 91%, and the corrosion rate of Comparative Example 1 is higher than that of Examples 4-7 and Examples 4-6, which indicates that the glucose acid derivative prepared by using 1H-benzimidazole-2-formaldehyde to modify glucose acid as a component of the scale inhibitor further improves the corrosion rate of the scale inhibitor, so that the scale inhibitor has good application in circulating water; the corrosion rates of Examples 8-9 are higher than 89%, and the corrosion rate of Example 10 is higher than 95%, and the Cl - corrosion rate of the scale inhibitor in Example 10 is higher than that in Example 6, and the corrosion rates of Examples 8-9 are higher than that in Example 1, which indicates that the addition of 3-hydroxybutyric acid to the scale inhibitor further improves the corrosion rate of the scale inhibitor, and the addition of the glucose acid derivative and 3-hydroxybutyric acid to the scale inhibitor significantly improves the corrosion rate of the scale inhibitor.

[0090] The conventional operations in the operation steps of the present application are well known to those skilled in the art, and will not be described here.

[0091] The above-described examples have described the technical solutions of the present application in detail, and it should be understood that the above-described examples are only specific embodiments of the present application and are not used to limit the present application, and any modification, supplement or similar substitution within the principle range of the present application should be included in the protection scope of the present application.

Claims

1. A scale inhibitor comprising a phosphonic acid component; the phosphonic acid component comprises 2-phosphonobutane-l,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylene diamine tetra(methylene phosphonic acid); wherein the weight ratio of 2-phosphonobutane-l,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylene diamine tetra(methylene phosphonic acid) is 1-2:0.5-1.5:0.5-1; the scale inhibitor further comprises a glucose acid derivative prepared by modifying gluconic acid with 1H-benzimidazole-2-carboxaldehyde; the scale inhibitor further comprises a carboxylic acid copolymer; the carboxylic acid copolymer comprises at least one of polyacrylic acid, polymaleic acid, polyaspartic acid, and polyepoxysuccinic acid; the glucose acid derivative is added in an amount of 1-4 wt% of the scale inhibitor.

2. The antifouling agent according to claim 1, characterized by: the scale inhibitor further comprises at least one of hydrochloric acid, phosphoric acid, and sulfuric acid.

3. The antifouling agent according to claim 1, characterized by: the scale inhibitor further comprises at least one of zinc chloride, zinc sulfate, and sodium hexametaphosphate.

4. The antifouling agent according to claim 1, characterized by: the scale inhibitor further comprises at least one of isothiazolinone, methyl benzisothiazolinone, and benzisothiazolinone.

5. Use of the scale inhibitor of claim 1 in a recirculating cooling water system.

6. Use according to claim 5, characterized in that: the scale inhibitor is added to the cooling water in an amount of 40-180 mg / L.

7. A method of preparing the antifouling agent of claim 1, comprising: each component is placed in a container in a proportion, and mixed uniformly to obtain the scale inhibitor.

8. Use of a glucose acid derivative in the preparation of a scale inhibitor, the glucose acid derivative being prepared by modifying gluconic acid with 1H-benzimidazole-2-carboxaldehyde; the scale inhibitor comprising a phosphonic acid component; the phosphonic acid component comprising 2-phosphonobutane-l,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylene diamine tetra(methylene phosphonic acid); wherein the weight ratio of 2-phosphonobutane-l,2,4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and hexamethylene diamine tetra(methylene phosphonic acid) is 1-2:0.5-1.5:0.5-1; the glucose acid derivative being added in an amount of 1-4 wt% of the scale inhibitor.

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