Special dispersing agent for circulating water and preparation method thereof

Abstract

The invention relates to the technical field of dispersing agent preparation, and particularly discloses a special dispersing agent for circulating water and a preparation method thereof.The dispersing agent is prepared from 80-100 parts of polyaspartic acid, 10-30 parts of styrene sulfonic acid, 20-40 parts of acrylic acid, 2-5 parts of corrosion inhibitor, 5-10 parts of dodecyl dimethyl benzyl ammonium chloride and 50-100 parts of solubilizer; the dispersing agent is free of phosphorus components, the problem of eutrophication of water after long-time use is avoided, meanwhile, sulfonic acid groups and carboxyl groups are introduced, the application range of the dispersing agent is widened, the dispersing performance of the dispersing agent is improved, and the corrosion inhibitor and the sterilizing components are added, so that the dispersing agent is environment-friendly. The corrosion resistance of the circulating pipeline is improved, microorganisms are prevented from breeding in circulating water to form slime, and the dispersing performance of the dispersing agent is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dispersant preparation, and more specifically, to a dispersant special for circulating water and a preparation method thereof. Background Art

[0002] Circulating water refers to water that is treated and reused repeatedly in a closed or semi-closed system. In the industrial field, many devices (such as condensers in power plants, coolers in refineries, etc.) generate a large amount of heat during operation. Circulating water absorbs this heat through heat exchangers, reducing the temperature of the devices and increasing its own temperature. However, since circulating water is reused repeatedly, impurities such as minerals and microorganisms in the water will gradually accumulate. If not treated, it may lead to problems such as equipment scaling, corrosion, and microbial growth. Therefore, dispersants are generally added to circulating water to avoid the accumulation of minerals and microorganisms in the water.

[0003] Existing dispersants for circulating water are mainly divided into four types: organophosphonic acid dispersants, polycarboxylic acid dispersants, sulfonic acid dispersants, and phosphorus-containing polymer dispersants. For organophosphonic acid dispersants, due to the large amount of phosphorus elements they contain, they will cause eutrophication problems in water bodies during long-term use and discharge. At the same time, organophosphonic acid dispersants have poor high-temperature resistance and are easily decomposed in water bodies with higher temperatures, thus affecting the dispersion performance. For polycarboxylic acid dispersants, they also have the problem of poor high-temperature stability, and they have almost no corrosion inhibition effect. Instead, they even accelerate pipeline corrosion at high temperatures. For sulfonic acid dispersants, they have poor biodegradability and are difficult to degrade in the environment, easily affecting the ecological environment. For phosphorus-containing polymer dispersants, they have the problem of phosphorus discharge similar to organophosphonic acid dispersants, and their synthesis process is complex and the cost is relatively high.

[0004] Therefore, it is necessary to design a new dispersant special for circulating water to solve the problems of excessive phosphorus content, poor high-temperature stability, and difficulty in decomposition in existing dispersants. Summary of the Invention

[0005] In view of this, the present invention provides a dispersant special for circulating water, aiming to solve the problems of excessive phosphorus content, poor high-temperature stability, and difficulty in decomposition in existing dispersants.

[0006] On the one hand, the present invention provides a dispersant special for circulating water, comprising:

[0007] 80 - 100 parts of polyaspartic acid, 10 - 30 parts of styrene sulfonic acid, 20 - 40 parts of acrylic acid, 2 - 5 parts of corrosion inhibitor, 5 - 10 parts of dodecyl dimethyl benzyl ammonium chloride, and 50 - 100 parts of solubilizer;

[0008] On the other hand, the present invention also provides a preparation method of the dispersant special for circulating water, comprising the following steps:

[0009] Dissolve polyaspartic acid in water for the first mixing, and obtain the first mixture after stirring.

[0010] Add styrenesulfonic acid, acrylic acid and an initiator to the first mixture for the second mixing to obtain a second mixture.

[0011] Add a corrosion inhibitor and dodecyldimethylbenzylammonium chloride to the second mixture for the third mixing, and obtain the third mixture after stirring.

[0012] Add a solubilizer to the third mixture for the fourth mixing, and then perform post-treatment to obtain the dispersant special for circulating water.

[0013] Furthermore, the stirring speeds of the first mixing, the second mixing, the third mixing and the fourth mixing are 300 - 500 revolutions per minute, the temperature of the second mixing is 60 - 80 °C, and the time is 6 - 10 hours.

[0014] Furthermore, when the second mixing is carried out, observe the viscosity of the reaction system. When the viscosity of the reaction system begins to increase, add water, and the total number of parts of the water is 50 - 100 parts.

[0015] Furthermore, after the second mixing is completed, lower the temperature of the second mixture to 40 - 50 °C and then carry out subsequent reactions.

[0016] Furthermore, when adding the corrosion inhibitor and dodecyldimethylbenzylammonium chloride, first add the corrosion inhibitor, stir for 30 - 60 minutes, then add dodecyldimethylbenzylammonium chloride, and stir for 30 - 60 minutes.

[0017] Furthermore, when washing the reaction product, perform multiple washings until the conductivity of the washing liquid is stable.

[0018] Furthermore, the post-treatment includes: filtration, washing and drying, and the drying temperature is 40 - 60 °C.

[0019] Furthermore, before the second mixing, perform vacuum distillation on the acrylic acid, and perform filtration and refining on the vinylsulfonic acid.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Copolymerize polyaspartic acid, styrenesulfonic acid, and acrylic acid. Polyaspartic acid is a high molecular polymer with good water solubility and biodegradability. Using polyaspartic acid as the main chain can improve the water solubility and biodegradability of the dispersant. The addition of styrenesulfonic acid introduces a large number of sulfonic acid groups into the main chain. Sulfonic acid groups have strong acidity and high affinity for metal ions, which can effectively disperse scale in water. At the same time, the conjugated system of the benzene ring in styrenesulfonic acid can increase the rigidity of the molecular chain and improve the thermal stability of the dispersant. The addition of acrylic acid introduces a large number of carboxyl groups into the main chain, which can effectively disperse slightly soluble salts such as calcium carbonate and calcium sulfate in water, prevent their precipitation and scaling, and can also disperse impurities such as iron oxides and sediment in water.

[0022] 2. By adding corrosion inhibitors and dodecyldimethylbenzylammonium chloride, the corrosion inhibition and bactericidal effects of the dispersant are improved, avoiding the problem of blockage caused by microbial growth during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0024] Figure 1 It is a flowchart of the preparation method of the special dispersant for circulating water provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] Recirculating water refers to water that is treated and reused repeatedly in a closed or semi-closed system. In the industrial field, many devices (such as condensers in power plants, coolers in refineries, etc.) generate a large amount of heat during operation. Recirculating water absorbs this heat through a heat exchanger, reducing the temperature of the device and increasing its own temperature. However, since recirculating water is reused repeatedly, impurities such as minerals and microorganisms in the water will gradually accumulate. If not treated, it may cause problems such as equipment scaling, corrosion, and microbial growth. Therefore, a dispersant is generally added to the recirculating water to avoid the accumulation of minerals and microorganisms in the water.

[0027] Existing dispersants for recirculating water are mainly divided into four types: organic phosphonic acid dispersants, polycarboxylic acid dispersants, sulfonic acid dispersants, and phosphorus-containing polymer dispersants. For organic phosphonic acid dispersants, due to the large amount of phosphorus elements contained therein, it will cause eutrophication problems in water bodies during long-term use and discharge. At the same time, the high-temperature resistance of organic phosphonic acid dispersants is poor, and they are easily decomposed in water bodies with higher temperatures, thus affecting the dispersion performance. For polycarboxylic acid dispersants, they also have the problem of poor high-temperature stability, and they have almost no corrosion inhibition effect. At high temperatures, they even accelerate pipeline corrosion. For sulfonic acid dispersants, their biodegradability is poor, and they are difficult to degrade in the environment, easily affecting the ecological environment. For phosphorus-containing polymer dispersants, they have the problem of phosphorus discharge similar to that of organic phosphonic acid dispersants, and their synthesis process is complex and the cost is relatively high. Therefore, it is necessary to design a new special dispersant for recirculating water to solve the problems of excessive phosphorus content, poor high-temperature stability, and difficult decomposition in existing dispersants.

[0028] On the one hand, in some embodiments of the present invention, a special dispersant for recirculating water includes the following components in parts by mass:

[0029] 80 - 100 parts of polyaspartic acid, 10 - 30 parts of styrene sulfonic acid, 20 - 40 parts of acrylic acid, 2 - 5 parts of corrosion inhibitor, 5 - 10 parts of dodecyl dimethyl benzyl ammonium chloride, and 50 - 100 parts of solubilizer;

[0030] The preferred components of the special dispersant for recirculating water in the present invention include: 90 - 100 parts of polyaspartic acid, 20 - 30 parts of styrene sulfonic acid, 30 - 40 parts of acrylic acid, 4 - 5 parts of corrosion inhibitor, 8 - 10 parts of dodecyl dimethyl benzyl ammonium chloride, and 75 - 100 parts of solubilizer;

[0031] The preferred components of the special dispersant for recirculating water in the present invention include: 100 parts of polyaspartic acid, 30 parts of styrene sulfonic acid, 40 parts of acrylic acid, 5 parts of corrosion inhibitor, 10 parts of dodecyl dimethyl benzyl ammonium chloride, and 100 parts of solubilizer;

[0032] In the present invention, the corrosion inhibitor is preferably benzotriazole, the initiator is preferably ammonium sulfate, and the solubilizer is preferably polyethylene glycol.

[0033] It can be understood that polyaspartic acid is a high molecular polymer with good water solubility and biodegradability. Using polyaspartic acid as the main chain can improve the water solubility and biodegradability of the dispersant; the addition of styrene sulfonic acid introduces a large number of sulfonic acid groups into the main chain. Sulfonic acid groups have strong acidity and high affinity for metal ions, and can effectively disperse scale substances in water. At the same time, the conjugated system of the benzene ring in styrene sulfonic acid can increase the rigidity of the molecular chain and improve the thermal stability of the dispersant; the addition of acrylic acid introduces a large number of carboxyl groups into the main chain, which can effectively disperse slightly soluble salts such as calcium carbonate and calcium sulfate in water, prevent their precipitation and scaling, and can also disperse impurities such as iron oxides and sediment in water.

[0034] It can be understood that the corrosion inhibitor and dodecyl dimethyl benzyl ammonium chloride improve the corrosion inhibition and bactericidal effects of the dispersant, and avoid the problem of blockage caused by the growth of microorganisms during long-term use.

[0035] On the other hand, in some embodiments of the present invention, a preparation method of a dispersant for circulating water includes:

[0036] Dissolve polyaspartic acid in water for the first mixing, and obtain a first mixture after stirring;

[0037] Add styrene sulfonic acid, acrylic acid and an initiator to the first mixture for the second mixing to obtain a second mixture;

[0038] Add a corrosion inhibitor and dodecyl dimethyl benzyl ammonium chloride to the second mixture for the third mixing, and obtain a third mixture after stirring;

[0039] Add a solubilizer to the third mixture for the fourth mixing, and then perform post-treatment to obtain the dispersant for circulating water.

[0040] Specifically, a reaction vessel equipped with a stirrer, a thermometer and a condenser is selected as the reaction vessel. When adding styrene sulfonic acid and acrylic acid, they should be added slowly in sequence to ensure that the monomers are fully mixed and uniform.

[0041] It is understandable that polyaspartic acid, styrenesulfonic acid, and acrylic acid are copolymerized. Polyaspartic acid is a high molecular polymer with good water solubility and biodegradability. Using polyaspartic acid as the main chain can improve the water solubility and biodegradability of the dispersant. The addition of styrenesulfonic acid introduces a large number of sulfonic acid groups into the main chain. Sulfonic acid groups have strong acidity and high affinity for metal ions, which can effectively disperse scale in water. At the same time, the conjugated system of the benzene ring in styrenesulfonic acid can increase the rigidity of the molecular chain and improve the thermal stability of the dispersant. The addition of acrylic acid introduces a large number of carboxyl groups into the main chain, which can effectively disperse slightly soluble salts such as calcium carbonate and calcium sulfate in water, prevent their precipitation and scaling, and can also disperse impurities such as iron oxides and sediment in water.

[0042] It is understandable that the addition of corrosion inhibitors and dodecyl dimethyl benzyl ammonium chloride improves the corrosion inhibition and bactericidal effects of the dispersant, avoiding the problem of blockage caused by microbial growth during long-term use.

[0043] In some embodiments of the present invention, the stirring speeds of the first mixing, second mixing, third mixing, and fourth mixing are 300 - 500 revolutions per minute; preferably 400 - 500 revolutions per minute; more preferably 500 revolutions per minute;

[0044] The temperature of the second mixing is 60 - 80 °C, preferably 70 - 80 °C, more preferably 80 °C; the time is 6 - 10 hours, preferably 8 - 10 hours, more preferably 10 hours.

[0045] It is understandable that continuous stirring can ensure the uniform distribution of monomers in the reaction system, avoiding too high or too low local concentration. Moreover, stirring enables the newly added monomers (styrenesulfonic acid and acrylic acid) to quickly and fully contact the polyaspartic acid main chain and the existing monomers, thereby increasing the chance of copolymerization between them and facilitating the uniform introduction of functional groups (such as carboxyl groups, sulfonic acid groups, and benzene ring structures) into the dispersant molecules.

[0046] It is understandable that when the initiator initiates the polymerization reaction, heat is generated at the reaction center. Without stirring, this heat will accumulate locally, possibly resulting in too high local temperature, affecting the performance of the product, and even causing adverse phenomena such as explosive polymerization.

[0047] In some embodiments of the present invention, when the second mixing is carried out, the viscosity of the reaction system is observed. When the viscosity of the reaction system begins to increase, water is added, and the total number of parts of the water is 50 - 100 parts.

[0048] It is understandable that with the addition of monomers such as styrenesulfonic acid and acrylic acid, the viscosity of the reaction system will increase. At this time, adding an appropriate amount of deionized water can improve the stirring effect, ensure the smooth progress of the reaction, and better mix all components.

[0049] It can be understood that adding appropriate amounts of deionized water in stages according to the viscosity of the reaction system ensures a higher concentration of reactants at the beginning of the reaction, promotes the rapid start-up of the copolymerization reaction and the effective introduction of functional groups. When the reaction proceeds to a certain extent and the physical properties of the reaction system need to be adjusted, deionized water is added. This ensures the reaction efficiency while taking into account the operability of the reaction system.

[0050] In some embodiments of the present invention, after the second mixing is completed, the temperature of the second mixture is lowered to 40-50°C before the subsequent reaction is carried out, and the temperature is preferably 40°C.

[0051] It is understandable that adding the corrosion inhibitor after lowering the temperature of the reaction system to 40-50°C can avoid chemical changes in the corrosion inhibitor under high temperature conditions, ensuring that it can enter the dispersant system with an effective chemical structure. At the same time, at lower temperatures, the viscosity of the reaction system is relatively more stable, which is conducive to the corrosion inhibitor being evenly dispersed in the system. If the corrosion inhibitor is added at high temperatures, due to the violent thermal motion of the system, the corrosion inhibitor may aggregate locally and cannot interact evenly with the dispersant molecules, thereby affecting its corrosion inhibition effect in the circulating water system.

[0052] In some embodiments of the present invention, when adding the corrosion inhibitor and dodecyl dimethyl benzyl ammonium chloride, the corrosion inhibitor is added first, stirred for 30-60 minutes, and then dodecyl dimethyl benzyl ammonium chloride is added and stirred for 30-60 minutes; the stirring time is preferably 60 minutes.

[0053] It is understandable that adding the corrosion inhibitor and bactericidal ingredients step by step and stirring is gentler than adding multiple ingredients at the same time, which may cause significant changes in the physical and chemical properties of the system, such as precipitation, agglomeration or violent chemical reactions.

[0054] It is understandable that adding and stirring at intervals allows the corrosion inhibitor and the bactericidal component to play their independent functions. The corrosion inhibitor focuses on the corrosion protection of metals, while the bactericidal component is mainly used to inhibit the growth and reproduction of microorganisms. This step-by-step addition method helps to maintain the integrity of their respective functions, thereby better realizing the multiple functions of the dispersant in the circulating water system, that is, having good corrosion inhibition and bactericidal effects at the same time.

[0055] In some embodiments of the present invention, when washing the reaction product, washing is performed multiple times until the conductivity of the washing solution is stable.

[0056] Specifically, deionized water is used for multiple washings during washing, and the conductivity of the washing liquid is observed.

[0057] It is understandable that conductivity is a physical quantity that measures the conductive ability of a solution, which mainly depends on the concentration of ions and the charge number of ions in the solution. During the process of washing the reaction product, impurities usually exist in the washing liquid in the form of ions, such as ammonium ions and sulfate ions decomposed from unreacted initiators, or ions dissociated from carboxyl groups and sulfonic acid groups in residual monomers. When the washing liquid contains these ionic impurities, the conductivity will increase. As the washing progresses, the ionic impurities are continuously washed away, the ionic concentration in the washing liquid gradually decreases, and the conductivity also decreases accordingly. When the conductivity of the washing liquid is stable, it proves that these ionic impurities have been completely removed.

[0058] In some embodiments of the present invention, the post-treatment includes: filtration, washing, and drying, and the drying temperature is 40 - 60 °C; the drying is preferably vacuum drying, and the drying temperature is preferably 60 °C.

[0059] It is understandable that at the beginning of drying, the dispersant product contains relatively more free water and bound water. The free water is mainly the surface water remaining after washing, and these waters are relatively easy to be evaporated and removed. At this stage, as the water evaporates rapidly, the weight of the product will decrease significantly. As the drying progresses, the water content gradually decreases, and the bound water in the product begins to be slowly removed. There is a certain chemical or physical binding force between the bound water and the product molecules, and the removal is relatively difficult, so the rate of weight loss will gradually slow down. When it is found that the weight change is less than a certain threshold, it can be preliminarily judged that the drying process is approaching the end. This means that most of the water in the product has been removed, and continued drying may damage the active ingredients in the product or there will be no obvious weight change.

[0060] In some embodiments of the present invention, before the second mixing, the acrylic acid is subjected to vacuum distillation treatment, and the vinylsulfonic acid is subjected to filtration and refining treatment.

[0061] Specifically, the vacuum distillation, filtration, and refining can be carried out by conventional methods in the art.

[0062] It is understandable that high-purity monomers can reduce the interference of impurities on the reaction and improve the introduction efficiency of functional groups. Subjecting acrylic acid to vacuum distillation treatment to remove impurities such as inhibitors that may be contained therein can ensure its activity in the copolymerization reaction.

[0063] It is understandable that styrenesulfonic acid, due to its benzene ring structure, may undergo partial polymerization during storage. It can be subjected to filtration and refining treatment to ensure that it can participate in the copolymerization reaction smoothly and effectively introduce the benzene ring and sulfonic acid group into the molecular structure of the dispersant.

[0064] Example 1

[0065] S1. In a reaction vessel equipped with a stirrer, a thermometer, and a condenser, add 200 parts of deionized water. Start the stirrer, maintain a stirring speed of 300 revolutions per minute, keep the reaction temperature at 60 °C, and slowly add 80 parts of polyaspartic acid.

[0066] S2. Carry out vacuum distillation treatment on acrylic acid and carry out filtration and refining treatment on ethenesulfonic acid for standby. After the polyaspartic acid is completely dissolved, add 10 parts of styrenesulfonic acid and 20 parts of acrylic acid in sequence, and continuously stir. Observe the viscosity of the reaction system during the stirring process. Whenever it is observed that the viscosity of the reaction system begins to increase, add a certain amount of deionized water. The total number of parts of deionized water added is 50. After fully mixing evenly, add 2 parts of ammonium sulfate and react for 6 hours.

[0067] S3. After the reaction is completed, lower the temperature of the reaction system to 50 °C, add 2 parts of benzotriazole, stir for 30 minutes, and then add 5 parts of dodecyldimethylbenzylammonium chloride and stir for 30 minutes.

[0068] S4. After the stirring is completed, add 50 parts of polyethylene glycol, stir evenly, filter the reaction product, and then wash it with a large amount of deionized water until the conductivity of the washing liquid is stable. Subsequently, dry the washed product under vacuum at 40 °C until the weight change rate of the product is significantly slowed down, and the special dispersant for circulating water is obtained after the drying is completed.

[0069] Example 2

[0070] S1. In a reaction vessel equipped with a stirrer, a thermometer, and a condenser, add 200 parts of deionized water. Start the stirrer, maintain a stirring speed of 400 revolutions per minute, keep the reaction temperature at 70 °C, and slowly add 90 parts of polyaspartic acid.

[0071] S2. Carry out vacuum distillation treatment on acrylic acid and carry out filtration and refining treatment on ethenesulfonic acid for standby. After the polyaspartic acid is completely dissolved, add 20 parts of styrenesulfonic acid and 30 parts of acrylic acid in sequence, and continuously stir. Observe the viscosity of the reaction system during the stirring process. Whenever it is observed that the viscosity of the reaction system begins to increase, add a certain amount of deionized water. The total number of parts of deionized water added is 100. After fully mixing evenly, add parts of ammonium sulfate and react for 8 hours.

[0072] S3. After the reaction is completed, lower the temperature of the reaction system to 40 °C, add 4 parts of benzotriazole, stir for 60 minutes, and then add 8 parts of dodecyldimethylbenzylammonium chloride and stir for 60 minutes.

[0073] S4. After completion of stirring, add 75 parts of polyethylene glycol. After stirring evenly, filter the reaction product, and then wash it with a large amount of deionized water until the conductivity of the washing liquid is stable. Subsequently, vacuum-dry the washed product at 50 °C until the weight change rate of the product significantly slows down. After the drying is completed, the dispersant special for circulating water is obtained.

[0074] Example 3

[0075] S1. In a reaction vessel equipped with a stirrer, a thermometer, and a condenser, add 200 parts of deionized water, turn on the stirrer, maintain the stirring speed at 500 revolutions per minute, maintain the reaction temperature at 80 °C, and slowly add 100 parts of polyaspartic acid.

[0076] S2. Perform vacuum distillation on acrylic acid, filter and refine vinylsulfonic acid for standby. After the polyaspartic acid is completely dissolved, add 30 parts of styrenesulfonic acid and 40 parts of acrylic acid in sequence, and continuously stir. Observe the viscosity of the reaction system during the stirring process. Whenever it is observed that the viscosity of the reaction system begins to increase, add a certain amount of deionized water. The total number of parts of deionized water added is 100. After fully mixing evenly, add ammonium sulfate, and react for 10 hours.

[0077] S3. After the reaction is completed, lower the temperature of the reaction system to 40 °C, add 5 parts of benzotriazole, stir for 60 minutes, and then add 10 parts of dodecyldimethylbenzylammonium chloride and stir for 60 minutes.

[0078] S4. After completion of stirring, add 100 parts of polyethylene glycol. After stirring evenly, filter the reaction product, and then wash it with a large amount of deionized water until the conductivity of the washing liquid is stable. Subsequently, vacuum-dry the washed product at 60 °C until the weight change rate of the product significantly slows down. After the drying is completed, the dispersant special for circulating water is obtained.

[0079] Those skilled in the art should understand that the embodiments of the present application and the present invention can be provided as methods, systems, or computer program products. Therefore, the present application and the present invention can adopt the form of completely hardware embodiments, completely software embodiments, or embodiments combining software and hardware aspects. Moreover, the present application and the present invention can adopt the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0080] This application and the present invention are described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of this application and the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, as well as the combination of flows and / or blocks in the flowchart and / or block diagram. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 in the block or multiple blocks.

[0081] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device implements the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 in the block or multiple blocks.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the Figure 1 one or more flows and / or blocks Figure 1 in the block or multiple blocks.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent replacements, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A special dispersant for circulating water, characterized in that, Comprising the following components in parts by mass: 80 - 100 parts of polyaspartic acid, 10 - 30 parts of styrenesulfonic acid, 20 - 40 parts of acrylic acid, 2 - 5 parts of corrosion inhibitor, 5 - 10 parts of dodecyldimethylbenzylammonium chloride, and 50 - 100 parts of solubilizer.

2. A preparation method for the special dispersant for circulating water described in claim 1, characterized in that, Including the following steps: Dissolve polyaspartic acid in water for the first mixing, and obtain the first mixture after stirring; Add styrenesulfonic acid, acrylic acid and initiator to the first mixture for the second mixing to obtain the second mixture; Add corrosion inhibitor and dodecyldimethylbenzylammonium chloride to the second mixture for the third mixing, and obtain the third mixture after stirring; Add solubilizer to the third mixture for the fourth mixing, and then perform post-treatment to obtain the dispersant special for circulating water.

3. The preparation method of the special dispersant for circulating water according to claim 2, characterized in that, The stirring speeds of the first mixing, the second mixing, the third mixing and the fourth mixing are 300 - 500 revolutions per minute, the temperature of the second mixing is 60 - 80 °C, and the time is 6 - 10 hours.

4. The preparation method of the special dispersant for circulating water according to claim 2, characterized in that, When the second mixing is carried out, observe the viscosity of the reaction system. When the viscosity of the reaction system begins to increase, add water, and the total parts of the water are 50 - 100 parts.

5. The preparation method of the special dispersant for circulating water according to claim 2, characterized in that, After the second mixing is completed, lower the temperature of the second mixture to 40 - 50 °C and then carry out subsequent reactions.

6. The preparation method of the special dispersant for circulating water according to claim 2, characterized in that When adding the corrosion inhibitor and dodecyldimethylbenzylammonium chloride, first add the corrosion inhibitor, stir for 30 - 60 minutes, then add dodecyldimethylbenzylammonium chloride, and stir for 30 - 60 minutes.

7. The preparation method of the special dispersant for circulating water according to claim 2, wherein, When washing the reaction product, perform multiple washings until the conductivity of the washing liquid is stable.

8. The preparation method of the special dispersant for circulating water according to claim 2, characterized in that, The post-treatment includes: filtration, washing and drying, and the drying temperature is 40 - 60 °C.

9. The preparation method of the special dispersant for circulating water according to claim 2, characterized in that, Before the second mixing, carry out vacuum distillation treatment on the acrylic acid, and carry out filtration and refining treatment on the vinylsulfonic acid.

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