A corrosion and scale inhibitor and its preparation method

Abstract

The present invention relates to the technical field of water treatment, and specifically provides a corrosion inhibitor and a preparation method thereof. The preparation method comprises the following steps: dissolving sodium bisulfite in a solvent, heating the mixture to 80-90° C., adding epichlorohydrin dropwise with a molar ratio of epichlorohydrin to sodium bisulfite of 1:1-1.05, continuously stirring and reacting for 2-4 hours, and pretreating the reaction product after completion of the reaction to obtain sodium 3-chloro-2-hydroxypropanesulfonate; and uniformly mixing sodium 3-chloro-2-hydroxypropanesulfonate and amino-terminated polyether in a solvent at a molar ratio of 6.05-6.3:1, heating the mixture to 70-90° C., continuously stirring and reacting for 4-6 hours, and removing impurities, concentrating and purifying the reaction product to obtain the corrosion inhibitor. The corrosion inhibitor achieves efficient corrosion and scale inhibition performance by virtue of multiple functional groups, such as multiple sulfonic acid groups, multiple hydroxyl groups, and polyetheramine groups, in the molecular structure of the corrosion inhibitor.

Description

Technical Field

[0001] The present application relates to the field of water treatment technology, and in particular to a corrosion and scale inhibitor and a preparation method thereof. Background Art

[0002] In natural gas station process systems, boilers serve as a key heat source, continuously supplying high-temperature hot water to heat exchangers. This hot water transfers heat energy to the natural gas flow through the heat exchanger tubes, compensating for the temperature loss caused by pressure reduction and throttling. This heat transfer process is crucial for maintaining the natural gas transmission temperature and preventing hydrate blockage. However, scale accumulates on the boiler's heating surfaces over long-term operation. Scale acts as a thermal resistance, hindering the proper transfer of heat to the water and reducing heat transfer efficiency.

[0003] Organic phosphonic acid corrosion and scale inhibitors are currently widely used in industrial water treatment. These traditional corrosion and scale inhibitors mainly inhibit scale formation by chelating calcium and magnesium ions or lattice distortion. Although they have excellent chelating ability and high-temperature stability, they are difficult to biodegrade and can easily lead to eutrophication of water bodies after discharge, causing adverse effects on the environment. Summary of the Invention

[0004] In response to the above problems, the present application provides a corrosion inhibitor and a preparation method thereof, which achieves efficient corrosion inhibition and scale inhibition performance through multiple functional groups such as multiple sulfonic acid groups, multiple hydroxyl groups and polyether amine groups in the molecular structure of the corrosion inhibitor.

[0005] To achieve the purpose of the present invention, this application provides the following technical solutions:

[0006] In a first aspect, the present invention provides a method for preparing a corrosion inhibitor and scale inhibitor, comprising the following steps:

[0007] Sodium bisulfite is dissolved in a solvent, and the temperature is raised to 80-90° C., and then epichlorohydrin is added dropwise, with a molar ratio of epichlorohydrin to sodium bisulfite being 1:1-1.05. Stirring is continued and the reaction is carried out for 2-4 hours. After the reaction is completed, the pH is adjusted to 6-7 with sodium bicarbonate to obtain a first reaction product, and the first reaction product is further treated to obtain a white solid product, sodium 3-chloro-2-hydroxypropanesulfonate;

[0008] The sodium 3-chloro-2-hydroxypropanesulfonate and the amino-terminated polyether are mixed uniformly in the solvent at a molar ratio of 6.05-6.3:1, and the mixture is heated to 70-90° C., continuously stirred, and reacted for 4-6 hours. During the reaction, the pH of the reaction solution is adjusted to 8-9 with sodium bicarbonate. After the reaction is completed, a second reaction product is generated, and the second reaction product is further subjected to impurity removal, concentration, and purification to obtain the corrosion and scale inhibitor;

[0009] The reaction equation for the reaction of the sodium 3-chloro-2-hydroxypropanesulfonate with the amino-terminated polyether to generate the corrosion and scale inhibitor is expressed as follows:

[0010]

[0011] Wherein, x, y, and z are all greater than or equal to 1, and the sum of x, y, and z is equal to 5 or 6.

[0012] In some embodiments, the reaction equation for the reaction of epichlorohydrin with sodium bisulfite to generate sodium 3-chloro-2-hydroxypropanesulfonate is expressed as:

[0013] .

[0014] In some embodiments, the processing of the first reaction product to obtain a white solid product, sodium 3-chloro-2-hydroxypropanesulfonate, further includes: cooling the temperature to below -10°C in an ice-water bath, separating and removing the liquid by filtration, washing the solid obtained by filtration and separation three times with deionized water to obtain a pure product, and vacuum drying at 70°C to obtain white crystals, i.e., sodium 3-chloro-2-hydroxypropanesulfonate.

[0015] In some embodiments, the removing impurities, concentrating and purifying the second reaction product to obtain the corrosion inhibitor and scale inhibitor further includes: using a silica gel column to elute the second reaction product with an ethanol / water gradient to separate and remove unreacted sodium 3-chloro-2-hydroxypropanesulfonate to obtain a decontaminated solution; and performing reduced pressure rotary evaporation on the decontaminated solution to remove the solvent to obtain a viscous product, which is the corrosion inhibitor and scale inhibitor.

[0016] In some embodiments, the solvent is a mixture of water and ethanol in a volume ratio of 1:1.

[0017] In a second aspect, the present application provides a corrosion inhibitor and scale inhibitor, the molecular structure of which is represented by:

[0018]

[0019] Wherein, x, y, and z are all greater than or equal to 1, and the sum of x, y, and z is equal to 5 or 6.

[0020] The corrosion and scale inhibitor of the present application includes multiple functional groups such as multiple sulfonic acid groups, multiple hydroxyl groups and polyetheramine groups, achieving efficient corrosion and scale inhibition performance. Among them, the highly polar sulfonic acid groups in the scale and corrosion inhibitor of the present application chelate with metal ions such as calcium phosphate sulfate, calcium carbonate, zinc scale, etc. in water to form chelates, thereby preventing the metal ions from contacting with weak scale-forming anions, greatly reducing the probability of scale formation. In particular, since the molecular structure contains multiple sulfonic acid groups, the chelate capacity is significantly enhanced through the multi-dentate coordination effect, thereby exerting an excellent scale inhibition effect. At the same time, the polyetheramine chain in the scale and corrosion inhibitor structure of the present application has large steric hindrance, and the solubility of sulfonates is better than that of traditional carboxylates and phosphates, which can effectively prevent the aggregation of chelates and solve the problem that traditional scale inhibitors are prone to secondary deposition; at the same time, the hydrophilic hydroxyl groups, polyether chains and polar tertiary amine groups in the scale and corrosion inhibitor structure of the present application can improve the dispersion performance of the corrosion and scale inhibitor itself and the chelate in water, and maintain good solubility and dispersion stability in the water system. At the same time, the corrosion and scale inhibitor of the present application does not contain phosphorus and is environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application.

[0022] Figure 1 This is a schematic diagram of the molecular structure of the corrosion and scale inhibitor provided in the examples of the present application. DETAILED DESCRIPTION

[0023] To facilitate understanding of the features and effects of the present invention by those skilled in the art, the following provides a general description and definition of the terms and expressions used in the specification and claims. Unless otherwise indicated, all technical and scientific terms used herein have the ordinary meanings as understood by those skilled in the art regarding the present invention. In the event of conflict, the definitions in this specification shall prevail.

[0024] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0025] All features, such as values, amounts, contents, and concentrations, described herein as numerical ranges or percentage ranges are provided for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to include and specifically disclose all possible subranges and individual values ​​within the range (including integers and fractions).

[0026] In this document, for the sake of brevity, not all possible combinations of the various technical features in each embodiment or example are described. Therefore, as long as there are no contradictions in the combination of these technical features, the various technical features in each embodiment or example can be combined in any way, and all possible combinations should be considered to be within the scope of this specification.

[0027] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0028] The following is a further explanation of the present application with reference to specific embodiments.

[0029] The present invention provides a method for preparing a corrosion inhibitor and scale inhibitor, comprising the following steps:

[0030] Sodium bisulfite is dissolved in a solvent, and the temperature is raised to 80-90° C., and then epichlorohydrin is added dropwise. The molar ratio of epichlorohydrin to sodium bisulfite is 1:1-1.05. Stirring is continued and the reaction is carried out for 2-4 hours. After the reaction is completed, the pH is adjusted to 6-7 with sodium bicarbonate to obtain a first reaction product, and the first reaction product is further treated to obtain a white solid product, sodium 3-chloro-2-hydroxypropanesulfonate.

[0031] After uniformly mixing sodium 3-chloro-2-hydroxypropanesulfonate and amino-terminated polyether in a solvent at a molar ratio of 6.05-6.3:1, the mixture is heated to 70-90°C, continuously stirred and reacted for 4-6 hours. During the reaction, HCl is generated and the pH of the reaction solution is adjusted to 8-9 with sodium bicarbonate. After the reaction is completed, the reaction product is impurity-removed, concentrated and purified to obtain a corrosion and scale inhibitor.

[0032] In some embodiments, the reaction equation for the reaction of sodium 3-chloro-2-hydroxypropanesulfonate with amino-terminated polyether to generate a corrosion and scale inhibitor is expressed as:

[0033]

[0034] wherein x, y, and z are all greater than or equal to 1, and the sum of x, y, and z is equal to 5 or 6. In this reaction, the chlorine atom of the sodium sulfonate is replaced by the primary amino group (—NH2) of the amino-terminated polyether to generate a sulfonic acid polyetheramine.

[0035] In some embodiments, the reaction of epichlorohydrin with sodium bisulfite to generate sodium 3-chloro-2-hydroxypropanesulfonate is a nucleophilic ring-opening reaction. Epichlorohydrin is ring-opened under the action of sodium bisulfite (NaHSO3) to generate sodium 3-chloro-2-hydroxypropanesulfonate, which can be expressed as follows:

[0036] .

[0037] In some embodiments, the reaction product is subjected to impurity removal, concentration, and purification to obtain a corrosion and scale inhibitor, further comprising: cooling the reaction product to below -10°C in an ice-water bath, separating and removing the liquid by filtration, washing the solid separated by filtration three times with deionized water to obtain a pure product, and vacuum drying at 70°C to obtain white crystals, namely, sodium 3-chloro-2-hydroxypropanesulfonate.

[0038] In some embodiments, the second reaction product is subjected to impurity removal, concentration, and purification to obtain a corrosion and scale inhibitor, further comprising:

[0039] The reaction product is eluted with an ethanol / water gradient on a silica gel column to separate and remove unreacted sodium 3-chloro-2-hydroxypropanesulfonate to obtain a decontaminated solution; the decontaminated solution is subjected to reduced pressure rotary evaporation to remove the solvent to obtain a viscous product, which is a corrosion and scale inhibitor.

[0040] In some embodiments, the solvent is a mixture of water and ethanol in a volume ratio of 1:1.

[0041] like Figure 1 The figure shows a schematic diagram of the molecular structure of the corrosion and scale inhibitor provided in the embodiment of the present application. The corrosion and scale inhibitor of the present application includes multiple functional groups such as multiple sulfonic acid groups, multiple hydroxyl groups and polyetheramine groups, thereby achieving efficient corrosion and scale inhibition performance. The highly polar sulfonic acid groups in the scale and corrosion inhibitor of the present application chelate with metal ions such as calcium phosphate sulfate, calcium carbonate, zinc scale, etc. in water to form chelates, thereby preventing the metal ions from contacting with scale-forming anions, thereby greatly reducing the probability of scale formation. In particular, since the molecular structure contains multiple sulfonic acid groups, the chelate capacity is significantly enhanced through the multi-dentate coordination effect, thereby exerting an excellent scale inhibition effect. At the same time, the polyetheramine chain in the scale and corrosion inhibitor structure of the present application has a large steric hindrance, which can effectively prevent the aggregation of chelates and solve the problem that traditional scale inhibitors are prone to secondary deposition; at the same time, the hydrophilic hydroxyl groups in the scale and corrosion inhibitor structure of the present application can improve the dispersion performance of the corrosion and scale inhibitor itself and the chelate in water, and maintain good solubility and dispersion stability in the water system. At the same time, the corrosion and scale inhibitor of the present application does not contain phosphorus and is environmentally friendly.

[0042] Example 1

[0043] 0.5 mol of epichlorohydrin, 0.53 mol of sodium bisulfite, 60 ml of ethanol, and 60 mol of water were measured and added to a four-necked flask equipped with a thermometer, condenser, and stirrer. The mixture was stirred and heated to 80°C before epichlorohydrin was added dropwise. The reaction was allowed to proceed for 4 hours after the addition was complete. After the reaction was complete, the pH was adjusted to 6-7 with sodium bicarbonate, then the temperature was cooled to below -10°C in an ice-water bath, and the liquid was removed by filtration. The solid obtained by filtration was washed three times with deionized water to obtain a pure product, which was then dried in vacuo at 70°C to obtain white crystals, namely, sodium 3-chloro-2-hydroxypropanesulfonate.

[0044] 0.72 mol of sodium 3-chloro-2-hydroxypropanesulfonate and 0.12 mol of amino-terminated polyether (from Dongying Hairuibao New Materials Co., Ltd., model: amino-terminated polyether (polyetheramine) T403, average molecular weight = 440) were uniformly mixed in a solvent, and then heated to 70°C, continuously stirred and reacted for 4 hours. During the reaction, the pH of the reaction solution was adjusted to 8-9 with sodium bicarbonate. After the reaction was completed, the reaction product was eluted using a silica gel column with an ethanol / water gradient (the volume ratio of the two was 3:1, 2:1, and 1:1, respectively) to separate and remove unreacted sodium 3-chloro-2-hydroxypropanesulfonate to obtain a decontaminated solution. The decontaminated solution was subjected to reduced pressure rotary evaporation to remove the solvent to obtain a viscous product, which was a corrosion and scale inhibitor.

[0045] Example 2

[0046] 0.5 mol of epichlorohydrin, 0.54 mol of sodium bisulfite, 60 ml of ethanol, and 60 mol of water were measured and added to a four-necked flask equipped with a thermometer, condenser, and stirrer. The mixture was stirred and heated to 85°C before epichlorohydrin was added dropwise. The reaction was allowed to proceed for 4 hours after the addition was complete. After the reaction was complete, the pH was adjusted to 6-7 with sodium bicarbonate, then the temperature was cooled to below -10°C in an ice-water bath, and the liquid was removed by filtration. The solid obtained by filtration was washed three times with deionized water to obtain a pure product, which was then dried in vacuo at 70°C to obtain white crystals, namely, sodium 3-chloro-2-hydroxypropanesulfonate.

[0047] 0.738 mol of sodium 3-chloro-2-hydroxypropanesulfonate and 0.12 mol of amino-terminated polyether (from Dongying Hairuibao New Materials Co., Ltd., model: amino-terminated polyether (polyetheramine) T403, average molecular weight = 440) were uniformly mixed in a solvent, and then heated to 80°C, continuously stirred and reacted for 5 hours. During the reaction, the pH of the reaction solution was adjusted to 8-9 with sodium bicarbonate. After the reaction was completed, the reaction product was eluted using a silica gel column with an ethanol / water gradient (the volume ratio of the two was 3:1, 2:1, and 1:1, respectively) to separate and remove unreacted sodium 3-chloro-2-hydroxypropanesulfonate to obtain a decontaminated solution. The decontaminated solution was subjected to reduced pressure rotary evaporation to remove the solvent to obtain a viscous product, which was a corrosion and scale inhibitor.

[0048] Example 3

[0049] 0.5 mol of epichlorohydrin, 0.55 mol of sodium bisulfite, 60 ml of ethanol, and 60 mol of water were measured and added to a four-necked flask equipped with a thermometer, condenser, and stirrer. The mixture was stirred and heated to 90°C. Epichlorohydrin was then added dropwise. The reaction was allowed to proceed for 4 hours after the addition was complete. After the reaction was complete, the pH was adjusted to 6-7 with sodium bicarbonate, then the temperature was cooled to below -10°C in an ice-water bath. The liquid was removed by filtration, and the solid obtained by filtration was washed three times with deionized water to obtain a pure product. The product was then dried in vacuo at 70°C to obtain white crystals, namely, sodium 3-chloro-2-hydroxypropanesulfonate.

[0050] 0.756 mol of sodium 3-chloro-2-hydroxypropanesulfonate and 0.12 mol of amino-terminated polyether (from Dongying Hairuibao New Materials Co., Ltd., model: amino-terminated polyether (polyetheramine) T403, average molecular weight = 440) were uniformly mixed in a solvent, and then heated to 90°C, continuously stirred and reacted for 6 hours. During the reaction, the pH of the reaction solution was adjusted to 8-9 with sodium bicarbonate. After the reaction was completed, the reaction product was eluted using a silica gel column with an ethanol / water gradient (the volume ratio of the two was 3:1, 2:1, and 1:1, respectively) to separate and remove unreacted sodium 3-chloro-2-hydroxypropanesulfonate to obtain a decontaminated solution. The decontaminated solution was subjected to reduced pressure rotary evaporation to remove the solvent to obtain a viscous product, which was a corrosion and scale inhibitor.

[0051] The corrosion and scale inhibitors prepared in Examples 1-3 of the present invention and the comparative examples were tested for the following items: scale inhibition performance test, corrosion inhibition performance test, hydrophilic dispersibility test, and anti-aggregation performance test.

[0052] It should be noted that the scale inhibition performance test: GB / T 16632-2008 method was used to determine the calcium carbonate inhibition performance under different conditions, and anhydrous CaCl2 and NaHCO3 solids were used to prepare c(Ca 2+ )=600mg / L,c(HCO3 -)=1200mg / L (calculated as CaCO3) in experimental water. Heat the sample in an 80℃ water bath for 10h, cool it to room temperature, and titrate the remaining Ca in the supernatant with EDTA standard solution. 2+ And compared with the blank test, calculate the scale inhibition rate of the corrosion and scale inhibitor on CaCO3 scale.

[0053] Corrosion Inhibition Performance Test: a. Preparation of the pickling solution: Dilute 50 mL of concentrated hydrochloric acid to 250 mL with distilled water, add 2.0 g of hexamethylenetetramine, and dissolve and mix thoroughly. b. Coupon Pretreatment: Before the experiment, polish the coupons in successive grades using 200#, 400#, 600#, 800#, and 1200# metallographic sandpaper. Then, degrease with acetone and dehydrate with anhydrous ethanol. After dehydration, blot dry with filter paper and place in a desiccator for later use. c. Refer to GB / T 18175-2014 and use a rotating coupon (Q235 carbon steel) corrosion tester for the experiment. The rotation speed is 90 rpm and the time is 72 hours at a certain temperature. After the coupon is finished, the corrosion products on the surface of the coupon are removed with a soft brush. After soaking in the pickling solution for 30 seconds, rinse with tap water, and then soak in 60g / L NaOH solution for 30 seconds. Then, wipe it clean with absorbent cotton in distilled water, and finally rinse with distilled water. Dry it with filter paper, soak it in anhydrous ethanol solution for about 3 minutes, wash and dry it, and weigh it in a desiccator for 4 hours. The corrosion rate is calculated based on the mass difference before and after the coupon test.

[0054] Hydrophilic dispersibility test: Prepare solutions of equal concentrations of various corrosion and scale inhibitors, and measure the solution transmittance using a UV spectrophotometer. The higher the transmittance, the better the dispersibility.

[0055] Anti-aggregation test: Prepared with 100mg / L Ca 2+ The test solution containing 100 mg / L of corrosion and scale inhibitor (calculated as CaCl2) was magnetically stirred (500 rpm, 25°C) for 30 minutes to ensure sufficient reaction. The solution was then moved into a static tank and aged at 25°C for 24 hours. The supernatant was collected from 2 cm below the liquid surface and the Z-Average particle size was measured using a dynamic light scattering (DLS). The results were repeated three times and the average value was taken.

[0056] The scale inhibition performance test, corrosion inhibition performance test, hydrophilic dispersibility test and anti-aggregation performance test results of the corrosion and scale inhibitors prepared in Examples 1 to 3 and the comparative example are listed in Table 1.

[0057] Table 1 Test results of the embodiments and comparative examples

[0058] Test items HEDP (Comparative Example 1) PSS (Comparative Example 2) Example 1 Example 2 Example 3 <![CDATA[Scale inhibition rate (CaCO3)]]> 92.5% 78.2% 91.8% 92.6% 94.3% Corrosion inhibition rate (carbon steel) 85% 42% 91% 94% 96% Hydrophilic dispersion (light transmittance) 73.6% 89.2% 94.5% 95.8% 96.2% Anti-aggregation (D50 particle size) 520nm 280nm 220nm 195nm 185nm

[0059] The comparative examples include Example 1: hydroxyethylidene diphosphonic acid (HEDP) and Example 2: sodium polystyrene sulfonate (PSS). As can be seen in the table, Examples 1-3 all exhibit significantly higher scale inhibition rates than the comparative examples, with Example 3 achieving the highest performance, thanks to the synergistic chelation of the polysulfonic acid groups and the steric hindrance of the polyetheramine chains. While HEDP exhibits some scale inhibition, its reliance on a high phosphorus content is environmentally unfavorable. PSS, which disperses suspended particles through electrostatic repulsion and prevents scale formation, exhibits relatively poor scale inhibition performance. Furthermore, Example 3 exhibits the best dispersibility due to the synergistic hydrophilic effect of the hydroxyl groups and polyetheramine chains. While PSS exhibits relatively good hydrophilicity, its resistance to aggregation is insufficient. The chelate compound in Example 3 exhibits the smallest particle size, demonstrating that the steric hindrance of its polyetheramine chains effectively prevents aggregation. HEDP exhibits severe aggregation due to the formation of a rigid calcium phosphonate precipitate.

[0060] It should be noted that when the corrosion inhibitor and scale inhibitor of the embodiment of the present application is used for boiler water scale inhibition, it should be noted that 200g of corrosion inhibitor and scale inhibitor should be added to the boiler feed water per ton of water. Since the corrosion inhibitor and scale inhibitor is chemically stable at less than 160°C, it is suitable for atmospheric pressure boilers.

[0061] The corrosion and scale inhibitor of the present application includes multiple functional groups such as multiple sulfonic acid groups, multiple hydroxyl groups and polyetheramine groups, achieving efficient corrosion and scale inhibition performance. Among them, the highly polar sulfonic acid groups in the scale and corrosion inhibitor of the present application chelate with metal ions such as calcium phosphate sulfate, calcium carbonate, zinc scale, etc. in water to form chelates, thereby preventing the metal ions from contacting with weak scale-forming anions, greatly reducing the probability of scale formation. In particular, since the molecular structure contains multiple sulfonic acid groups, the chelate capacity is significantly enhanced through the multi-dentate coordination effect, thereby exerting an excellent scale inhibition effect. At the same time, the polyetheramine chain in the scale and corrosion inhibitor structure of the present application has large steric hindrance, and the solubility of sulfonates is better than that of traditional carboxylates and phosphates, which can effectively prevent the aggregation of chelates and solve the problem that traditional scale inhibitors are prone to secondary deposition; at the same time, the hydrophilic hydroxyl groups, polyether chains and polar tertiary amine groups in the scale and corrosion inhibitor structure of the present application can improve the dispersion performance of the corrosion and scale inhibitor itself and the chelate in water, and maintain good solubility and dispersion stability in the water system. At the same time, the corrosion and scale inhibitor of the present application does not contain phosphorus and is environmentally friendly.

[0062] The above embodiments are intended only to illustrate the technical solutions of the present application and are not intended to limit them. The present application is not limited to the precise structures described above and illustrated in the accompanying drawings, and it cannot be assumed that the specific implementation of the present application is limited to these descriptions. For those skilled in the art of the present application, any changes and modifications made without departing from the concept of the present application should be deemed to fall within the scope of protection of the present application.

Claims

1. A method for preparing a corrosion and scale inhibitor, characterized in that: The preparation method comprises the following steps: Sodium bisulfite is dissolved in a solvent, and the temperature is raised to 80-90° C., and then epichlorohydrin is added dropwise, with a molar ratio of epichlorohydrin to sodium bisulfite being 1:1-1.

05. Stirring is continued and the reaction is carried out for 2-4 hours. After the reaction is completed, the pH is adjusted to 6-7 with sodium bicarbonate to obtain a first reaction product, and the first reaction product is further treated to obtain a white solid product, sodium 3-chloro-2-hydroxypropanesulfonate; The sodium 3-chloro-2-hydroxypropanesulfonate and the amino-terminated polyether are mixed uniformly in the solvent at a molar ratio of 6.05-6.3:1, and the mixture is heated to 70-90° C., continuously stirred, and reacted for 4-6 hours. During the reaction, the pH is adjusted to 8-9 with sodium bicarbonate. After the reaction is completed, a second reaction product is generated, and the second reaction product is further subjected to impurity removal, concentration, and purification to obtain the corrosion and scale inhibitor; The reaction equation for the reaction of the sodium 3-chloro-2-hydroxypropanesulfonate with the amino-terminated polyether to generate the corrosion and scale inhibitor is expressed as follows: Wherein, x, y, and z are all greater than or equal to 1, and the sum of x, y, and z is equal to 5 or 6.

2. The method for preparing the corrosion and scale inhibitor according to claim 1, wherein: The reaction equation for the reaction of epichlorohydrin with sodium bisulfite to generate sodium 3-chloro-2-hydroxypropanesulfonate is expressed as follows: 。 3. The method for preparing the corrosion and scale inhibitor according to claim 1, characterized in that: The first reaction product is treated to obtain a white solid product, sodium 3-chloro-2-hydroxypropanesulfonate, further comprising: The mixture was cooled to below -10°C in an ice-water bath, and the liquid was removed by filtration. The solid obtained by filtration was washed three times with deionized water to obtain a pure product, which was then dried in vacuo at 70°C to obtain white crystals, namely sodium 3-chloro-2-hydroxypropanesulfonate.

4. The method for preparing the corrosion and scale inhibitor according to claim 1, characterized in that: The second reaction product is subjected to impurity removal, concentration and purification to obtain the corrosion and scale inhibitor, further comprising: The second reaction product is eluted with an ethanol / water gradient on a silica gel column to separate and remove unreacted sodium 3-chloro-2-hydroxypropanesulfonate to obtain a decontaminated solution; the decontaminated solution is subjected to reduced pressure rotary evaporation to remove the solvent to obtain a viscous product, which is the corrosion and scale inhibitor.

5. The method for preparing the corrosion and scale inhibitor according to claim 1, characterized in that: The solvent is a mixture of water and ethanol in a volume ratio of 1:

1.

6. A corrosion and scale inhibitor, characterized in that: The molecular structural formula of the corrosion and scale inhibitor is expressed as: Wherein, x, y, and z are all greater than or equal to 1, and the sum of x, y, and z is equal to 5 or 6.

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