Mixed coal water slurry dispersing agent and preparation method thereof

Abstract

The invention relates to the technical field of coal water slurry dispersing agents, in particular to a mixed coal water slurry dispersing agent and a preparation method thereof. The preparation method comprises the following steps: step 1, raw material preparation, a first reaction container, a second reaction container, a mixing container, a first component, a second component and a third component, and the first component comprises anthracene oil, naphthalene, concentrated sulfuric acid, formaldehyde, lime and water. The chemical structure and the chemical components of the dispersing agent are highly stable by controlling the proportion of all the components and the adding speed, the stirring speed and the temperature change in the preparation process, compared with traditional lignin and humic acid dispersing agents, the impurity content is greatly reduced, the adverse effect on the performance of the coal water slurry is reduced, and the dispersing agent has a relatively high dispersing effect and is suitable for industrial production. The coal water slurry is suitable for various different coal qualities, the stability and the fluidity of the coal water slurry are effectively improved, and the coal water slurry can be kept in a stable state for a long time no matter in the storage or transportation process.

Description

Technical Field

[0001] The invention relates to the technical field of coal-water slurry dispersants, and in particular to a mixed coal-water slurry dispersant and a preparation method thereof. Background Art

[0002] Coal water slurry dispersant plays a key role in the preparation of coal water slurry. Its main function is to adsorb on the interface between water molecules and coal powder particles, change the surface properties of coal powder particles, and reduce the free energy of the coal water slurry mixing system, so that the coal powder particles can be stably and evenly dispersed in water. At present, the coal water slurry dispersant technology mainly uses lignin and humic acid as the main components. Lignin-based dispersants are usually derived from the reprocessing of papermaking waste liquid, while humic acid is a mixture of macromolecular multi-substituted aromatic phenols with different molecular weights and structures. However, the existing coal water slurry dispersants with lignin and humic acid as the main components have some problems, such as: First, they are products of nature with complex and unstable chemical structures and compositions, which makes it difficult to accurately control the performance of water-coal slurry. Secondly, the high impurity content results in a low coal slurry concentration, which affects the efficient utilization of coal resources. Furthermore, the poor fluidity affects the transportation and utilization efficiency of water-coal slurry. At the same time, they have poor resistance to interference from metal ions and are easily affected by metal ions during use, thus reducing their performance. In addition, precipitation is easily formed, which makes the stability of water-coal slurry poor, which is not conducive to long-term storage and transportation.

[0003] In view of this, there is an urgent need for a mixed water-coal slurry dispersant and a preparation method thereof to meet the needs of clean and efficient utilization of coal, improve the quality and performance requirements of water-coal slurry, and improve the shortcomings of the existing technology. Summary of the invention

[0004] The object of the present invention is to provide a mixed water-coal slurry dispersant and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, on the one hand, the present invention provides a method for preparing a mixed water-coal slurry dispersant, comprising the following steps: S1. Raw material preparation: a first reaction container, a second reaction container, a mixing container, component one, component two and component three, wherein component one includes anthracene oil, naphthalene, concentrated sulfuric acid, formaldehyde, lime and water, component two includes maleic anhydride, acrylic acid, AMPS, caustic soda, hydrogen peroxide and water, and component three includes OP-4; S2, prepare component one: first, anthracene oil and naphthalene are added to the first reaction vessel, and at the same time, a stirring device is turned on to stir them so that they are evenly mixed, and after the reaction vessel is initially heated to 140 ° C using a temperature control device, concentrated sulfuric acid is added, and after a second heating to 150 ° C-160 ° C, a constant temperature reaction is maintained for 3 hours, and continuous stirring is continued, afterwards, after the temperature is reduced to 100 ° C using a temperature control device, half of the water is added, and after the constant temperature stirring is maintained for 30 minutes, formaldehyde is added, and the temperature is heated three times using a temperature control device to make the temperature reach 110 ° C, and the constant temperature stirring is maintained for 3 hours, then lime is added, and the constant temperature stirring is continued for 1 hour, after the reaction is completed, the solid residue after the reaction is filtered out using a filtering device to obtain a pure component one, and finally it is stored in a suitable container and sealed for preservation; S3, preparing component 2: first, adding water into the second reaction container, turning on the stirring device and the heating device, raising the temperature of the water to 55°C-60°C, then adding maleic anhydride, AMPS and hydrogen peroxide in order, and using the stirring device to perform the first stirring, then adding acrylic acid while performing the second stirring, and adding the acrylic acid within 1 hour, then maintaining the constant temperature of 55°C-60°C for reaction and the third stirring for 4 hours, then adding caustic soda, and continuing the reaction and the fourth stirring for 1 hour, after the reaction is completed, obtaining component 2, and finally storing it in a suitable container and sealing it for preservation; S4. Mix to obtain the final product: First, add component one, component two and component three into a mixing container, turn on the stirring device to stir, and after stirring evenly, perform quality inspection on the product. After passing the inspection, store the product in a container, seal it and mark the product name, production date and batch.

[0006] As a further improvement of the present technical solution, in S2, the anthracene oil and naphthalene are added at a rate of 10 ml / min-20 ml / min, the concentrated sulfuric acid is added at a rate of 4 ml / min-8 ml / min, the formaldehyde is added at a rate of 6 ml / min-16 ml / min, and the lime is added at a rate of 100 g / min-200 g / min.

[0007] As a further improvement of the technical solution, in S2, the stirring speed of the stirring device is 20r / min-60r / min, wherein the stirring speed when anthracene oil and naphthalene are added is 30r / min-50r / min, the stirring speed after concentrated sulfuric acid is added and heated is 40r / min-60r / min, the stirring speed after water and formaldehyde are added and heated is 30r / min-40r / min, and the stirring speed after lime is added is 20r / min-30r / min.

[0008] As a further improvement of the present technical solution, in S2, the initial, secondary and tertiary heating rates of the temperature control device are all 2°C / min-3°C / min, and the cooling rate of the temperature control device is 1°C / min-2°C / min.

[0009] As a further improvement of the technical solution, in S3, the heating speed of the heating device is 1°C / min-2°C / min.

[0010] As a further improvement of the present technical solution, in S3, the first stirring speed of the stirring device is 40r / min-60r / min, the stirring time is 15min-20min, the second stirring speed of the stirring device is 30r / min-50r / min, the third stirring speed of the stirring device is 30r / min-40r / min, and the fourth stirring speed of the stirring device is 20r / min-30r / min.

[0011] As a further improvement of the present technical solution, in S3, maleic anhydride, AMPS and hydrogen peroxide are added at a rate of 6 g / min-12 g / min, acrylic acid is added at a rate of 3 g / min-6 g / min, and caustic soda is added at a rate of 8 g / min-16 g / min.

[0012] As a further improvement of the technical solution, in S4, the stirring speed of the stirring device is 30r / min-50r / min, and the stirring time is 30min-50min.

[0013] On the other hand, the present invention provides a mixed water-coal slurry dispersant prepared by any one of the preparation methods described above, comprising the following components in weight percentage: Component 1 42%-45%, component 2 50%-55% and component 3 3%-5%; of which: The first component comprises the following ingredients in weight percentage: anthracene oil 20%-25%, naphthalene 15%-20%, concentrated sulfuric acid 35%-40%, formaldehyde 15%-20%, lime 30%-35% and water 20%-30%; The second component includes the following ingredients in weight percentage: maleic anhydride 12%-15%, acrylic acid 2%-4%, AMPS 1%-2%, caustic soda 3%-5%, hydrogen peroxide 0.1%-0.5% and water 80%-85%; The component three includes ingredient OP-4.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the mixed water-coal slurry dispersant and its preparation method, the chemical structure and chemical composition of the dispersant are highly stable by controlling the proportion of each component and the addition speed, stirring speed and temperature change in the preparation process. Compared with traditional lignin and humic acid dispersants, the impurity content is greatly reduced, reducing the adverse effects on the performance of water-coal slurry. During use, the amount used is small but has a high dispersing effect. It is suitable for a variety of different coal qualities, effectively improving the stability and fluidity of water-coal slurry, and can maintain a stable state for a long time whether in storage or transportation.

[0015] 2. In the mixed water-coal slurry dispersant and its preparation method, through the synergistic effect of the components in components one, two and three, anthracene oil effectively reduces the agglomeration force of coal particles, naphthalene enhances the adsorption capacity of coal particles, improves the dispersibility and stability of the water-coal slurry dispersant, and enables the water-coal slurry to maintain good performance in different usage scenarios. In addition, the dispersant can also improve the combustion performance of water-coal slurry, reduce pollutant emissions, and achieve efficient and comprehensive utilization of coal. At the same time, the generated anthracenesulfonic acid and naphthalenesulfonic acid condensation products have excellent dispersibility for fine coal powder, which can make the fine coal powder evenly dispersed in the water-coal slurry; maleic anhydride, AMPS, and acrylic acid copolymers have excellent dispersibility for large-particle coal powder, ensuring the dispersion effect of large-particle coal powder; OP-4 has good dispersibility for coal powder with high oil content, thereby improving the dispersibility for coal particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a flow chart of the preparation method of the mixed water-coal slurry dispersant; Figure 2 It is a line graph of the detection indexes of each sample of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] The embodiment of the present invention provides a mixed coal water slurry dispersant, comprising the following components in weight percentage: Component 1 42%-45%, component 2 50%-55% and component 3 3%-5%, among which, Component 1 includes the following ingredients in weight percentage: Anthracene oil 20%-25%. Anthracene oil has good solubility and dispersibility, can interact with the surface of coal particles, reduce the agglomeration force between coal particles, make coal particles evenly dispersed in water-coal slurry, improve the fluidity and stability of water-coal slurry, and at the same time, the addition of anthracene oil helps to improve the combustion performance of water-coal slurry, make combustion more complete, and reduce pollutant emissions; Naphthalene 15%-20%. Naphthalene has high aromaticity and stability, which can enhance the adsorption capacity of the dispersant on coal particles and form a protective film on the surface of coal particles to prevent direct contact and agglomeration between coal particles. In addition, naphthalene can also improve the dispersion stability of water-coal slurry, making it less likely to precipitate and stratify during storage and transportation; However, anthracene oil and naphthalene will form anthracenesulfonic acid and naphthalenesulfonic acid polycondensates during the reaction process. Such polycondensates have excellent dispersibility for fine coal powder, can interact with the surface of coal particles, reduce the agglomeration force between coal particles, make the fine coal powder evenly dispersed in the water-coal slurry, and improve the fluidity and stability of the water-coal slurry. At the same time, the aromaticity and stability of naphthalene help to enhance the adsorption capacity of the dispersant for coal particles, providing better dispersion protection for the fine coal powder. Concentrated sulfuric acid 35%-40%; Formaldehyde 15%-20%. Formaldehyde has a strong cross-linking effect and can react with other ingredients to form a stable polymer structure, which is beneficial to enhance the adsorption capacity and stability of the dispersant and improve the dispersion effect of water-coal slurry; Lime 30%-35%. Lime is alkaline and can neutralize acidic components such as concentrated sulfuric acid and adjust the pH value of the dispersant; Water 20%-30%; Component 2 includes the following ingredients in weight percentage: Maleic anhydride 12%-15%. Maleic anhydride has good hydrophilicity and reactivity. It can undergo polymerization reaction with other components to form high molecular polymers, improve the dispersibility and stability of the dispersant, and make the coal particles in the water-coal slurry evenly dispersed in the water. In addition, maleic anhydride can also improve the rheological properties of the water-coal slurry, reduce its viscosity, and improve the transportation efficiency; Acrylic acid 2%-4%. Acrylic acid has strong hydrophilicity and adsorption capacity. It can form a stable adsorption layer on the surface of coal particles to prevent coal particles from agglomerating and improve the dispersion stability of water-coal slurry. At the same time, acrylic acid can also copolymerize with other ingredients to enhance the performance of the dispersant. AMPS (2-acrylamido-2-methylpropanesulfonic acid) 1%-2%. AMPS has good water solubility and salt resistance. It can play a stable dispersing role in high-salinity water-coal slurry. It can also react with the cations on the surface of coal particles to reduce the electrostatic attraction between coal particles. In addition, AMPS can also improve the high-temperature resistance of the dispersant, so that it can still maintain a good dispersion effect in a high-temperature environment; However, maleic anhydride has good hydrophilicity and reactivity, and can undergo polymerization reaction with AMPS and acrylic acid to form copolymers. This copolymer has excellent dispersibility for large-particle coal powder. By interacting with the surface of large-particle coal powder, it reduces its agglomeration tendency, makes the large-particle coal powder in the water-coal slurry evenly dispersed in water, and improves the overall dispersibility and stability of the water-coal slurry. At the same time, the hydrophilicity and adsorption capacity of acrylic acid and the water solubility and salt resistance of AMPS further enhance the dispersibility of the copolymer. Caustic soda 3%-5%; Hydrogen peroxide 0.1%-0.5%. Hydrogen peroxide has an oxidizing effect and can undergo redox reactions with other ingredients to promote the polymerization reaction. Water 80%-85%; Component three includes ingredients: OP-4 (alkylphenol polyoxyethylene ether) has good emulsifying and dispersing properties, and has good dispersing power for coal powder with high oil content, reducing the surface tension of water-coal slurry, making coal particles more easily wetted by water, thereby improving the dispersibility and stability of water-coal slurry. In addition, OP-4 can also work synergistically with other ingredients to further enhance the performance of the dispersant.

[0019] according to Figure 1 As shown, the embodiment of the present invention also provides a preparation method for preparing the above-mentioned mixed water-coal slurry dispersant, comprising the following steps: Step 1, raw material preparation: a first reaction container, a second reaction container, a mixing container, component one, component two and component three, the first reaction container and the first reaction container have good corrosion resistance and sealing properties, wherein the component one includes anthracene oil, naphthalene, concentrated sulfuric acid, formaldehyde, lime and water, the component two includes maleic anhydride, acrylic acid, AMPS, caustic soda, hydrogen peroxide and water, and the component three includes OP-4; Step 2, preparing component 1: first, anthracene oil and naphthalene are added to a first reaction container, the speed of adding anthracene oil and naphthalene is 10ml / min-20ml / min, which can ensure that the materials are fully mixed, improve the uniformity of the reaction, and prevent side reactions or safety hazards caused by excessive local concentration or rapid temperature changes. At the same time, a stirring device is turned on to stir the mixture, and the stirring speed of the stirring device is 20r / min-60r / min. The stirring speed of anthracene oil and naphthalene when added is 30r / min-50r / min to ensure that the mixture is uniform and does not cause adverse phenomena such as violent eddy currents, so that the mixture is uniformly mixed. By controlling the speed of adding anthracene oil and naphthalene, as well as the heating and stirring conditions, the stirring speed of the mixture is controlled. The temperature control equipment is used to heat the reaction vessel to 140°C for the first time, and then concentrated sulfuric acid is added. The speed of adding concentrated sulfuric acid is 4ml / min-8ml / min, which can effectively prevent the occurrence of violent reactions, improve the stability of the reaction, and avoid dangerous situations such as local overheating and reaction out of control caused by adding concentrated sulfuric acid too quickly. At the same time, it helps to fully mix concentrated sulfuric acid with other raw materials to make the reaction more uniform. After the second heating to 150°C-160°C, the constant temperature reaction is maintained for 3h, and continuous stirring is performed at a stirring speed of 40r / min-60r / min, which helps to promote the full contact and reaction of concentrated sulfuric acid with other substances. The reaction efficiency and uniformity can be improved, and the incomplete reaction caused by too slow stirring can be avoided. After that, the temperature is lowered to 100°C using the temperature control equipment, and half of the water is added. After the temperature is kept constant and stirred for 30 minutes, formaldehyde is added at a rate of 6ml / min-16ml / min, which helps the reaction system to remain relatively stable, fully mix the materials, and avoid excessive local concentration. At the same time, stable reaction conditions are conducive to improving the quality stability of the product. The temperature is raised three times using the temperature control equipment to reach 110°C, and the temperature is kept constant and stirred for 3 hours at a rate of 30r / min-40r / min. Then lime is added at a rate of 100 g / min-200g / min, effectively prevent the generation of dust, avoid local violent reactions caused by too fast addition speed, and also help to improve the controllability of the reaction, so that the reaction can proceed in the expected direction, and then continue to maintain constant temperature stirring for 1h, the stirring speed is 20r / min-30r / min, avoid unnecessary energy consumption and possible adverse effects on the reaction system due to too fast stirring speed, such as excessive foaming, etc., and also help the reactants to fully contact, promote the reaction, and improve the reaction efficiency. After the reaction is completed, use a filtering device to filter out the solid residue after the reaction to obtain a pure component one, and finally store it in a suitable container and seal it for preservation; The initial, secondary and tertiary heating rates of the above-mentioned temperature control equipment are all 2°C / min-3°C / min, which avoids local overheating caused by excessively rapid heating, prevents the initiation of side reactions and safety hazards, and ensures that the materials can be heated evenly. The cooling rate of the temperature control equipment is 1°C / min-2°C / min, which can prevent adverse effects caused by sudden temperature changes, such as changes in internal stress of the material, instability of the reaction system, etc., and helps to improve the controllability of the reaction, so that the reaction is carried out within a suitable temperature range, thereby ensuring the quality stability of the product. Step 3, preparing component 2: first, adding water to the second reaction container, turning on the stirring device and the heating equipment, and raising the temperature of the water to 55°C-60°C. The heating speed of the heating equipment is 1°C / min-2°C / min, which can ensure a steady temperature rise and prevent adverse reactions caused by sudden temperature changes, thereby improving the stability of the reaction and the quality of the product. Maleic anhydride, AMPS and hydrogen peroxide are added in sequence at a speed of 6g / min-12g / min to avoid violent reactions caused by adding too quickly, and at the same time facilitate their full mixing. A stirring device is used for the first stirring. The stirring device stirs the water at a speed of 40r / min-60r / min for a stirring time of 15min-20min to ensure that maleic anhydride, AMPS and hydrogen peroxide are fully mixed. By controlling the reaction temperature and stirring speed, maleic anhydride, AMPS and acrylic acid copolymer are generated, so that it can play a dispersing role on large-particle coal powder in subsequent applications. After that, acrylic acid is added while stirring for the second time, and the speed of acrylic acid addition is 3g / min-6g / min, which can prevent uneven reaction caused by too fast addition and enable acrylic acid to interact with other substances. The speed of the stirring device for the second stirring is 30r / min-50r / min, which prevents uneven reaction caused by too fast addition of acrylic acid and ensures that it is fully mixed with other substances. The addition is completed within 1 hour, and then the constant temperature of 55℃-60℃ is maintained for reaction and the third stirring is 4h. The speed of the stirring device for the third stirring is 30r / min-40r / min to maintain the full progress of the reaction. Then, caustic soda is added, and the speed of caustic soda addition is 8g / min-16g / min to avoid the adverse effects that may be caused by too fast addition speed, and the reaction and the fourth stirring are continued for 1h. The speed of the stirring device for the fourth stirring is 20r / min-30r / min. After the reaction is completed, component two is obtained, and finally it is stored in a suitable container and sealed for preservation; Step 4, mixing to obtain the final product: First, add component one, component two and component three into a mixing container, turn on the stirring device for stirring, the stirring speed of the stirring device is 30r / min-50r / min, so that copolymers such as anthracenesulfonic acid, naphthalenesulfonic acid polycondensate, maleic anhydride and OP-4 act synergistically, and disperse fine coal powder, coal powder with large particles and coal powder with high oil content respectively, ensure the overall dispersion performance and stability of the water-coal slurry, ensure that the three components are fully mixed and uniformly, and avoid the generation of excessive foam and violent eddy currents and other undesirable phenomena. The stirring time is 30min-50min. After stirring evenly, the product is quality tested, and the test items include dispersibility, stability, etc. After passing the test, the product is stored in a container and sealed to prevent moisture and contamination. At the same time, the product name, production date and batch are marked.

[0020] In the present invention, during the entire preparation process, controlling the addition speed of each raw material, the stirring speed, and the heating and cooling speeds of the temperature control equipment not only helps each component to fully exert its role, but also effectively improves the quality stability of the product, ensuring that the final mixed water-coal slurry dispersant has good dispersibility, stability and other properties, meeting the needs of clean and efficient utilization of coal.

[0021] In the mixed water-coal slurry dispersant, the anthracene oil and naphthalene of component 1 play a role of dissolution and dispersion through intermolecular forces such as van der Waals forces during the heating process, reducing the agglomeration force between coal particles. ， Formaldehyde and Anthracene, Naphthalene Condensation reaction occurs to form a stable polymer structure ； The maleic anhydride in component 2 is hydrophilic and reactive, and undergoes polymerization reaction with acrylic acid, AMPS, etc. to form a high molecular polymer. The molecules are connected by chemical bonds to form a long-chain polymer, such as nCH2=CHCOOH+mR→[CH2-CH(COOH)]nRm. AMPS reacts with the cations on the surface of coal particles to reduce the electrostatic attraction. ； During the mixing process, OP-4 reduces the surface tension of the water-coal slurry, making the coal particles easily wetted by water. The various components work synergistically to improve the dispersibility and stability of the water-coal slurry dispersant through a combination of physical and chemical effects.

[0022] Through the synergistic effect of the ingredients in components one, two and three, anthracene oil effectively reduces the agglomeration of coal particles, naphthalene enhances the adsorption capacity of coal particles, and improves the dispersibility and stability of the water-coal slurry dispersant, so that the water-coal slurry can maintain good performance in different usage scenarios. In addition, the dispersant can also improve the combustion performance of water-coal slurry, reduce pollutant emissions, and achieve efficient and comprehensive utilization of coal. At the same time, the anthracenesulfonic acid and naphthalenesulfonic acid condensation products produced have excellent dispersibility for fine coal powder, which can make the fine coal powder evenly dispersed in water-coal slurry; maleic anhydride, AMPS, and acrylic acid copolymers have excellent dispersibility for large-particle coal powder, ensuring the dispersion effect of large-particle coal powder; OP-4 has good dispersibility for coal powder with high oil content, thereby improving the dispersibility for coal particles.

[0023] By controlling the proportion of each component and the addition speed, stirring speed and temperature changes during the preparation process, the chemical structure and chemical composition of the dispersant are made highly stable. Compared with traditional lignin and humic acid dispersants, the impurity content is greatly reduced, reducing the adverse effects on the performance of water-coal slurry. During use, it has a high dispersing effect with a small amount, is adaptable to a variety of different coal qualities, and effectively improves the stability and fluidity of water-coal slurry. Whether in storage or transportation, it can maintain a stable state for a long time.

[0024] According to different raw material dosages, the mixed water-coal slurry dispersant provided by the present invention is further described through the following specific examples. Example

[0025] Raw material composition: Component 1: anthracene oil 25%, naphthalene 15%, concentrated sulfuric acid 35%, formaldehyde 15%, lime 30% and water 30%; Component 2: Maleic anhydride 15%, acrylic acid 4%, AMPS 2%, caustic soda 5%, hydrogen peroxide 0.5% and water 80%; Component 3: OP-4; Final composition: Component 1 45%, Component 2 50%, Component 3 5%; Preparation method: Preparation of component one: anthracene oil and naphthalene are added to a reaction container at a rate of 10 ml / min-20 ml / min, stirred and heated to 140°C, the stirring speed when anthracene oil and naphthalene are added is 30 r / min-50 r / min, after the initial heating to 140°C, concentrated sulfuric acid is added at a rate of 4 ml / min-8 ml / min, the temperature is heated to 150-160°C for the second time, and the reaction is carried out at a constant temperature for 3 hours, and the stirring speed is 40 r / min-60 r / min, then the temperature is lowered to 100°C, half of the water is added, and the temperature is stirred for 30 minutes, and formaldehyde is added at a rate of 6 ml / min-16 ml / min, and the temperature is raised to 110°C and stirred for 3 hours at a constant temperature, and the stirring speed is 30 r / min-40 r / min, and then lime is added at a rate of 100 g / min-200 g / min, and the reaction is continued for 1 hour, and the stirring speed is 20 r / min-30 r / min, and finally the solid residue is filtered out to obtain component one; Preparation of component 2: Heat water to 55-60°C, heat the heating equipment at a rate of 1-2°C / min, add maleic anhydride, AMPS and hydrogen peroxide in sequence at a rate of 6-12g / min, stir for the first time at a rate of 40-60r / min, stir for 15-20min, add acrylic acid at a rate of 3-6g / min while stirring, stir for the second time at a rate of 30-50r / min, add within 1h, and react at a constant temperature of 55-60°C for 4h, stir for the third time at a rate of 30-40r / min, then add caustic soda at a rate of 8-16g / min, continue to react and stir for 1h to obtain component 2, stir for the fourth time at a rate of 20-30r / min; Preparation of final product: Add component one, component two and component three into a mixing container according to the proportion, stir at a stirring speed of 30r / min-50r / min for 30-50min, conduct quality inspection after mixing evenly, and seal and store after passing the inspection. Example

[0026] Raw material composition: Component 1: anthracene oil 20%, naphthalene 20%, concentrated sulfuric acid 40%, formaldehyde 20%, lime 35% and water 20%; Component 2: Maleic anhydride 12%, acrylic acid 2%, AMPS 1%, caustic soda 3%, hydrogen peroxide 0.1% and water 85%; Component 3: OP-4; Final composition: Component 1 42%, Component 2 55%, Component 3 3%; Preparation method: The preparation methods of component one and component two are the same as those in Example 1; preparation of the final product: add component one, component two and component three into a mixing container according to the proportion, and stir at the same speed and time as in Example 1. After mixing evenly, perform quality inspection, and seal and store after passing the inspection. Example

[0027] Raw material composition: Component 1: anthracene oil 22.5%, naphthalene 17.5%, concentrated sulfuric acid 37.5%, formaldehyde 17.5%, lime 33% and water 25%; Component 2: Maleic anhydride 13.5%, acrylic acid 3%, AMPS 1.5%, caustic soda 4%, hydrogen peroxide 0.3% and water 82.5%; Component 3: OP-4; Final composition: Component 1 43.5%, Component 2 52.5%, Component 3 4%; Preparation method: The preparation methods of component one and component two are the same as those in Example 1; preparation of the final product: add component one, component two and component three into a mixing container according to the proportion, and stir at the same speed and time as in Example 1. After mixing evenly, perform quality inspection, and seal and store after passing the inspection.

[0028] In order to verify that the mixed coal water slurry dispersant prepared in the embodiment of the present invention has good stability and fluidity, the mixed coal water slurry dispersant provided in the embodiment of the present invention is described through the following test examples.

[0029] Test example The purpose of this test group is to explore the effects of different component ratios on coal water slurry dispersants.

[0030] Test objectives: To detect the stability, fluidity, dispersibility, apparent viscosity retention, adaptability (ability to adapt to different coal qualities) and combustion performance (such as combustion completeness, reduction of pollutant emissions, etc.) of the mixed water-coal slurry dispersant of the present invention.

[0031] Test method: Test group A, test group B and test group C respectively use the composition ratios of the water-coal slurry dispersant materials provided in Examples 1-3; the control example uses control group A, control group B and control group C, wherein: Control group A Raw material composition: Component 1: 25% lignin, 15% humic acid, 30% water; Component 2: None; Component 3: None; Final composition: only the ingredients of the above component 1, accounting for 100%; Preparation method: Add lignin and humic acid into a reaction container, stir evenly, add water, continue stirring for a period of time, and then simply filter to obtain the product.

[0032] Control group B Raw material composition: Component 1: anthracene oil 15%, naphthalene 10%, concentrated sulfuric acid 30%, formaldehyde 10%, lime 25%, water 40%; Component 2: maleic anhydride 10%, acrylic acid 1%, AMPS 0.5%, caustic soda 2%, hydrogen peroxide 0.05%, water 75%; Component 3: none; Final composition: Component 1 40%, Component 2 55%.

[0033] Preparation method: Preparation of component 1: add anthracene oil and naphthalene into a reaction container, heat to 130°C, add concentrated sulfuric acid, heat to 140°C again and react at constant temperature for 2h, cool to 90°C, add water, add formaldehyde, heat to 100°C and stir at constant temperature for 2h, add lime and react for 0.5h, filter to obtain component 1; Preparation of component 2: Heat water to 50°C, add maleic anhydride, AMPS and hydrogen peroxide, stir for 10 minutes, then add acrylic acid, react at 50°C for 3 hours, add caustic soda and react for 0.5 hours to obtain component 2; Preparation of final product: Mix components one, two and three in proportion, stir for 20 minutes, and seal and store after passing the test.

[0034] Control group C Raw material composition: Component 1: anthracene oil 30%, naphthalene 25%, concentrated sulfuric acid 45%, formaldehyde 25%, lime 40%, water 35%; Component 2: maleic anhydride 12%, acrylic acid 1%, AMPS 0.1%, caustic soda 2.5%, hydrogen peroxide 0.15%, water 75%; Component 3: OP-4; Final composition: Component 1 50%, Component 2 45%, Component 3 5%.

[0035] Preparation method: Preparation of component 1: add anthracene oil and naphthalene into a reaction container, heat to 150°C, add concentrated sulfuric acid, heat to 170°C and react for 4 hours, cool to 110°C, add water, add formaldehyde, heat to 120°C and stir for 4 hours, add lime and react for 1.5 hours, filter to obtain component 1; Preparation of component 2: Heat water to 65°C, add maleic anhydride, AMPS and hydrogen peroxide, stir for 25 minutes, then add acrylic acid, react at 65°C for 5 hours, add caustic soda and react for 1.5 hours to obtain component 2; Preparation of final product: Mix components one, two and three in proportion, stir for 60 minutes, and seal and store after passing the test.

[0036] according to Figure 2 From the comparative data shown, it can be seen that the test groups A, B, and C are significantly better than the control groups A, B, and C in terms of stability, fluidity, dispersibility, apparent viscosity retention, adaptability, and combustion performance.

[0038] It can be seen that the mixed water-coal slurry dispersant provided in the embodiment of the present invention can effectively improve the various properties of water-coal slurry by accurately controlling the proportion of each component and the addition speed, stirring speed and temperature change during the preparation process. Compared with the traditional control group A with lignin and humic acid as the main components, the dispersant of the present invention has been greatly improved in all aspects; compared with the control groups B and C, it also has obvious advantages in various aspects of performance.

[0039] From the above, we can see that the best is test group A, because among various performance indicators, the key indicators of test group A such as stability, dispersibility and apparent viscosity retention time are the highest, indicating that it has the best dispersion effect in water-coal slurry, and can keep the water-coal slurry in good condition during storage, transportation and use. At the same time, its combustion performance is also relatively good, which is helpful to achieve clean and efficient use of coal. In addition, the proportion and preparation method of each component in test group A can play a synergistic role of each component, thereby achieving the best dispersion effect and performance.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a mixed coal water slurry dispersant, characterized in that: The following steps are involved: S1. Raw material preparation: a first reaction container, a second reaction container, a mixing container, component one, component two and component three, wherein component one includes anthracene oil, naphthalene, concentrated sulfuric acid, formaldehyde, lime and water, component two includes maleic anhydride, acrylic acid, AMPS, caustic soda, hydrogen peroxide and water, and component three includes OP-4; S2, prepare component one: first, anthracene oil and naphthalene are added to the first reaction vessel, and at the same time, a stirring device is turned on to stir them so that they are evenly mixed, and after the reaction vessel is initially heated to 140 ° C using a temperature control device, concentrated sulfuric acid is added, and after a second heating to 150 ° C-160 ° C, a constant temperature reaction is maintained for 3 hours, and continuous stirring is continued, afterwards, after the temperature is reduced to 100 ° C using a temperature control device, half of the water is added, and after the constant temperature stirring is maintained for 30 minutes, formaldehyde is added, and the temperature is heated three times using a temperature control device to make the temperature reach 110 ° C, and the constant temperature stirring is maintained for 3 hours, then lime is added, and the constant temperature stirring is continued for 1 hour, after the reaction is completed, the solid residue after the reaction is filtered out using a filtering device to obtain a pure component one, and finally it is stored in a suitable container and sealed for preservation; S3, preparing component 2: first, adding water into the second reaction container, turning on the stirring device and the heating device, raising the temperature of the water to 55°C-60°C, then adding maleic anhydride, AMPS and hydrogen peroxide in order, and using the stirring device to perform the first stirring, then adding acrylic acid while performing the second stirring, and adding the acrylic acid within 1 hour, then maintaining the constant temperature of 55°C-60°C for reaction and the third stirring for 4 hours, then adding caustic soda, and continuing the reaction and the fourth stirring for 1 hour, after the reaction is completed, obtaining component 2, and finally storing it in a suitable container and sealing it for preservation; S4. Mix to obtain the final product: First, add component one, component two and component three into a mixing container, turn on the stirring device to stir, and after stirring evenly, perform quality inspection on the product. After passing the inspection, store the product in a container, seal it and mark the product name, production date and batch.

2. The method for preparing a mixed coal water slurry dispersant according to claim 1, characterized in that: In S2, the anthracene oil and naphthalene are added at a rate of 10 ml / min-20 ml / min, the concentrated sulfuric acid is added at a rate of 4 ml / min-8 ml / min, the formaldehyde is added at a rate of 6 ml / min-16 ml / min, and the lime is added at a rate of 100 g / min-200 g / min.

3. The method for preparing a mixed coal water slurry dispersant according to claim 1, characterized in that: In S2, the stirring speed of the stirring device is 20r / min-60r / min, among which the stirring speed when anthracene oil and naphthalene are added is 30r / min-50r / min, the stirring speed after concentrated sulfuric acid is added and heated is 40r / min-60r / min, the stirring speed after water and formaldehyde are added and heated is 30r / min-40r / min, and the stirring speed after lime is added is 20r / min-30r / min.

4. The method for preparing a mixed coal water slurry dispersant according to claim 1, characterized in that: In S2, the initial, secondary and tertiary heating rates of the temperature control device are all 2°C / min-3°C / min, and the cooling rate of the temperature control device is 1°C / min-2°C / min.

5. The method for preparing a mixed coal water slurry dispersant according to claim 1, characterized in that: In S3, the heating device heats up at a rate of 1°C / min-2°C / min.

6. The method for preparing a mixed coal water slurry dispersant according to claim 1, characterized in that: In S3, the first stirring speed of the stirring device is 40r / min-60r / min, the stirring time is 15min-20min, the second stirring speed of the stirring device is 30r / min-50r / min, the third stirring speed of the stirring device is 30r / min-40r / min, and the fourth stirring speed of the stirring device is 20r / min-30r / min.

7. The method for preparing a mixed coal water slurry dispersant according to claim 1, characterized in that: In S3, maleic anhydride, AMPS and hydrogen peroxide are added at a rate of 6 g / min-12 g / min, acrylic acid is added at a rate of 3 g / min-6 g / min, and caustic soda is added at a rate of 8 g / min-16 g / min.

8. The method for preparing a mixed coal water slurry dispersant according to claim 1, characterized in that: In S4, the stirring speed of the stirring device is 30r / min-50r / min, and the stirring time is 30min-50min.

9. A mixed coal water slurry dispersant prepared by the preparation method according to any one of claims 1 to 8, characterized in that: The composition includes the following weight percentages: Component 1 42%-45%, component 2 50%-55% and component 3 3%-5%; of which: The first component comprises the following ingredients in weight percentage: anthracene oil 20%-25%, naphthalene 15%-20%, concentrated sulfuric acid 35%-40%, formaldehyde 15%-20%, lime 30%-35% and water 20%-30%; The second component includes the following ingredients in weight percentage: maleic anhydride 12%-15%, acrylic acid 2%-4%, AMPS 1%-2%, caustic soda 3%-5%, hydrogen peroxide 0.1%-0.5% and water 80%-85%; The component three includes ingredient OP-4.

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