A high-efficiency flocculating agent and impurity removal process for sodium acetate solution

Abstract

The application discloses a kind of high-efficiency flocculants for sodium acetate solution and impurity removal process, belong to sodium acetate flocculant technical field.Flocculants include: polyaluminium chloride 40~60 parts, polyacrylamide 5~15 parts, borax 5~15 parts, cellulose acetate microspheres 5~15 parts, activated silicic acid 15~25 parts, zinc sulfate 3~7 parts, magnesium sulfate 3~7 parts by weight.Impurity removal process includes: preheating stock solution to 75~80 DEG C, adjust pH to 7.5~8.0, add 0.1%~0.5% flocculant, fast stirring 3~5min after slow stirring 10~15min, stand 30~60min settlement, filtration.The application realizes impurity removal rate more than 99% by the synergistic effect of inorganic-organic composite flocculant, the filtration speed is increased to 5 times of original process, and large-scale equipment modification is not needed, and it is suitable for 60 tons / day production scale.

Description

Technical Field

[0001] This invention relates to the field of sodium acetate flocculant technology, and particularly to a high-efficiency flocculant and impurity removal process for sodium acetate solutions. Background Technology

[0002] Sodium acetate, as an important chemical raw material, is widely used in water treatment, chemical synthesis, food additives, and other fields. In industrial production, sodium acetate stock solution often contains insoluble impurities and colloidal particles. These impurities not only easily lead to product turbidity and substandard purity, but also clog filtration equipment, resulting in low filtration efficiency and seriously affecting the stability of subsequent production processes and product quality.

[0003] The existing sodium acetate solution purification process has the following prominent drawbacks: Traditional filtration processes have poor adaptability: Traditional filtration processes have limited effectiveness in removing colloidal impurities. Colloidal particles can easily penetrate the filter media, and impurities tend to accumulate on the surface of the filter media, leading to frequent clogging of the filter media. This makes it impossible to meet the large-scale production demand of 60 tons / day, and the equipment maintenance cost is high.

[0004] Single flocculants are not effective: Existing single flocculants have poor compatibility with sodium acetate systems. Either the flocculation effect is weak and cannot completely remove impurities, or the flocculated products have a loose structure, are difficult to filter, and may even introduce new impurities, affecting the purity of sodium acetate products.

[0005] High equipment upgrade costs: Upgrading some impurity removal processes requires replacing a large number of core equipment, which is costly and cannot be adapted to the existing production scale of 60 tons / day. Enterprises cannot afford the cost of large-scale equipment upgrades, resulting in the existing processes operating inefficiently for a long time.

[0006] Therefore, there is an urgent need for a technical solution that can efficiently remove impurities from sodium acetate solution without requiring large-scale equipment modifications, adapting to existing process routes, and addressing the shortcomings of existing impurity removal processes. Summary of the Invention

[0007] The purpose of this invention is to provide a high-efficiency flocculant for sodium acetate solution, so as to solve the problems of low impurity removal efficiency, easy introduction of new impurities, high equipment modification cost, and weak process adaptability of sodium acetate solution in the prior art.

[0008] The purpose of this invention is also to provide a purification process that is suitable for a high-efficiency flocculation purification process with a production scale of 60 tons / day. This process ensures that the sodium acetate stock solution is free of impurities and that impurities can be completely flocculated and easily filtered. At the same time, it does not require major modifications to the existing equipment, thus ensuring the continuity and stability of the existing production process.

[0009] In a first aspect, the present invention provides a highly efficient flocculant for sodium acetate solutions, comprising, by weight, the following components: 40-60 parts of polyaluminum chloride, 5-15 parts of polyacrylamide, 5-15 parts of borax, 5-15 parts of cellulose acetate microspheres, 15-25 parts of activated silica, 3-7 parts of zinc sulfate, and 3-7 parts of magnesium sulfate.

[0010] Preferably, the alumina content in polyaluminum chloride is 26% to 30%.

[0011] Preferably, the polyacrylamide is cationic polyacrylamide.

[0012] Preferably, activated silicic acid is prepared by the following method: Activated silica can be obtained by adding 1g of water glass to 60-80mL of acid activator and activating for 1-5 hours.

[0013] Preferably, the acid activator includes sulfuric acid, hydrochloric acid, and nitric acid.

[0014] Preferably, cellulose acetate microspheres are prepared by the following method: A1. Cellulose acetate is prepared by reacting cellulose with an acylating agent at 80-90℃ for 2-3 hours; cellulose acetate is then dissolved in an ionic liquid to obtain a cellulose acetate solution. A2. Add an emulsification system to the cellulose acetate solution and emulsify at 80-90℃ for 0.5-1h; lower the temperature to 40-50℃ to allow the cellulose acetate solution to coagulate into spheres; add deionized water to solidify it and form cellulose acetate microspheres. A3. After stirring and standing, cellulose acetate microspheres are separated and washed to obtain the final product.

[0015] Preferably, the acylating agent is acetic anhydride.

[0016] Preferably, the ionic liquid includes BmimCl, EmimCl, and AmimCl liquids.

[0017] Preferably, the emulsion system comprises liquid paraffin and Span 80 in a volume ratio of (2-4):1.

[0018] Preferably, the cellulose acetate solution has a mass fraction of 3% to 5%.

[0019] On the other hand, the present invention also provides a sodium acetate solution purification process, comprising the following steps: S1. After the sodium acetate stock solution is heated by a preheating device, it is introduced into a flocculation tank. Large particulate impurities are removed by a preliminary impurity removal device, and then the pH is stabilized at 7.5-8.0 by a pH adjustment device before entering the flocculation reaction stage. S2. Start stirring, add flocculant solution at 0.1% to 0.5% of the volume of sodium acetate stock solution, stir quickly for 3 to 5 minutes and then stir slowly for 10 to 15 minutes. S3. Transfer the mixture to a sedimentation tank and let it stand. Filter the supernatant through a filtration device to obtain sodium acetate stock solution without impurities.

[0020] Preferably, the heating temperature of the preheating device is 75-80℃.

[0021] Preferably, the stirring speed for rapid stirring is 200-300 r / min, and the stirring speed for slow stirring is 50-100 r / min.

[0022] Preferably, the settling time is 30 to 60 minutes.

[0023] Preferably, the filtration equipment includes plate and frame filters and bag filters.

[0024] The beneficial effects of this invention are: 1. The equipment is highly adaptable and has low modification costs. It does not require large-scale modification of the original equipment. Only a small flocculant dosing device needs to be added next to the original flocculation tank to adapt to a production scale of 60 tons / day. The modification cost is reduced by more than 60% compared with the traditional equipment replacement plan, which greatly reduces the burden on enterprises.

[0025] 2. Excellent impurity removal effect and significantly improved filtration efficiency. The flocculant formula is highly compatible with the sodium acetate system and can completely flocculate insoluble impurities and colloidal particles in the raw solution. After treatment, there are no visible impurities in the sodium acetate raw solution, and the impurity removal rate is over 99%. The filtration efficiency is improved by more than 30% compared with the original process, effectively solving the problem of filter media clogging.

[0026] 3. The process is highly stable and adaptable. The dosage of flocculant and reaction parameters can be flexibly adjusted according to changes in the composition of the raw solution to ensure stable flocculation effect of different batches of raw solution, without the introduction of new impurities, thus ensuring consistent product quality.

[0027] 4. Easy to operate and highly compatible, the process flow is highly compatible with the original production route, and operators can master it with simple training. There is no need to change existing production habits, and the process can be upgraded quickly to ensure production continuity. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention are described clearly and completely. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] A highly efficient flocculant for sodium acetate solutions, comprising, by weight, the following components: 40-60 parts of polyaluminum chloride, 5-15 parts of polyacrylamide, 5-15 parts of borax, 5-15 parts of cellulose acetate microspheres, 15-25 parts of activated silica, 3-7 parts of zinc sulfate, and 3-7 parts of magnesium sulfate.

[0030] By adopting the above technical solutions, polyaluminum chloride, as an inorganic polymeric coagulant, produces polynuclear hydroxyl aluminum complexes and Al(OH)3 gels rich in hydroxyl groups on their surface through hydrolysis. These hydroxyl groups can form hydrogen bonds with the hydroxyl groups on the surface of polyvinyl alcohol resin powder and polyvinyl alcohol colloids, allowing the hydrolysis products to be firmly adsorbed onto the surface of impurity particles and promoting their aggregation and destabilization. Simultaneously, the Al(OH)3 gel has a large specific surface area, which, during flocculation, encapsulates and captures fine particles through a net-like sweeping action. Cationic polyacrylamide, as an organic polymeric coagulant aid, also forms hydrogen bonds with the amide groups on its molecular chains, allowing long-chain molecules to simultaneously adsorb onto the surface of multiple destabilized particles. Through adsorption bridging, it aggregates micro-flocs into large and dense flocs, significantly improving floc settling speed and filtration performance.

[0031] Acid activation treatment controls the degree of polymerization of silica in water glass within a suitable range, forming a polymer rich in active silanol groups. These silanol groups can interact with the surface of impurity particles through hydrogen bonds and coordination bonds, and at the same time form Al-O-Si bonds with the hydrolysis products of polyaluminum chloride, constructing an inorganic-organic composite network framework, which significantly enhances the structural strength and density of the flocs.

[0032] Cellulose acetate microspheres, serving as coagulation aids and carrier materials, offer a significantly higher specific surface area than ordinary cellulose powder due to their microsphere morphology. The abundant hydroxyl and acetyl groups on their surface can adsorb impurity particles and other flocculant components through hydrogen bonds and van der Waals forces. When uniformly dispersed in solution, the microspheres act as nuclei for floc growth, promoting the aggregation of components such as polyaluminum chloride and cationic polyacrylamide around them, forming core-shell structured composite flocs that significantly improve the mechanical strength and sedimentation stability of the flocs.

[0033] Borax hydrolyzes in water to produce boric acid and borate ions. Borate ions can form borate ester bonds or coordination complexes with polyhydroxy compounds such as the hydroxyl groups on the surface of cellulose microspheres and the silanol groups of silicic acid, enhancing the cross-linking density of the flocculent network structure. Zinc sulfate and magnesium sulfate are used as auxiliary components, and their Zn... 2+ Mg 2+ It can coordinate with the hydroxyl groups on the surface of activated silica and polyaluminum chloride hydrolysis products, participate in the formation of heteronuclear hydroxyl polymers, increase the inorganic cross-linking sites in the floc structure, further enrich the chemical composition and structural morphology of the flocs, and improve the density and mechanical strength of the flocs.

[0034] In some embodiments, the alumina content in polyaluminum chloride is 26% to 30%.

[0035] By adopting the above technical solutions, when the content of the effective component of polyaluminum chloride is too low, the flocculation capacity is insufficient, requiring an increased dosage and leading to increased costs; when the content is too high, the solution viscosity increases, the dispersibility is poor, and it is easy to form localized excessive concentrations and flocs, which reduces the flocculation effect. An Al2O3 content of 26% to 30% ensures that the unit mass of flocculant has sufficient hydrolyzed aluminum hydroxyl active components, strong adsorption and entrapment capabilities, good solution fluidity within this range, and can be quickly and uniformly dispersed in sodium acetate stock solution.

[0036] In some embodiments, the polyacrylamide is cationic polyacrylamide.

[0037] By adopting the above technical solutions, the impurities in the sodium acetate solution are mainly polyvinyl alcohol resin fine powder and polyvinyl alcohol colloid, which are rich in hydroxyl groups on their surface. The amide groups on the cationic polyacrylamide molecular chain can form hydrogen bonds with the hydroxyl groups on the surface of the impurities. The long-chain molecules adsorb multiple impurity particles at the same time, and aggregate them into large and dense flocs through adsorption bridging, thereby destroying the dispersion stability of colloidal impurities and improving the settling speed and filtration performance of the flocs.

[0038] In some embodiments, activated silica is prepared by the following method: Activated silica can be obtained by adding 1g of water glass to 60-80mL of acid activator and activating for 1-5 hours.

[0039] Acid activators include sulfuric acid, hydrochloric acid, and nitric acid.

[0040] By adopting the above technical solutions, ordinary silica has low activity and uneven degree of polymerization, and its effect is unstable when used directly as a flocculant additive. In addition, it has few silanol groups, resulting in weak adsorption and entrapment of impurities. By using acid activators, more active silanol groups can be formed, increasing the specific surface area and providing more hydrogen bonds and coordination adsorption sites.

[0041] In some embodiments, cellulose acetate microspheres are prepared by the following method: A1. Cellulose acetate is prepared by reacting cellulose with an acylating agent at 80-90℃ for 2-3 hours; cellulose acetate is then dissolved in an ionic liquid to obtain a cellulose acetate solution. A2. Add an emulsification system to the cellulose acetate solution and emulsify at 80-90℃ for 0.5-1h; lower the temperature to 40-50℃ to allow the cellulose acetate solution to coagulate into spheres; add deionized water to solidify it and form cellulose acetate microspheres. A3. After stirring and standing, cellulose acetate microspheres are separated and washed to obtain the final product.

[0042] The acylating agent is acetic anhydride.

[0043] Ionic liquids include BmimCl, EmimCl, and AmimCl liquids.

[0044] The emulsion system consists of liquid paraffin and Span 80 in a volume ratio of (2-4):1.

[0045] The cellulose acetate solution has a mass fraction of 3% to 5%.

[0046] By employing the above technical solutions, ordinary cellulose powder suffers from a small specific surface area, limited adsorption capacity, and is prone to uneven dispersion. Furthermore, it lacks suitable carrier materials to support other flocculants, resulting in poor synergistic effects among the components. By adding cellulose acetate microspheres, their microsphere morphology provides a large number of surface active sites, enhancing loading and adsorption capacity. In addition, cellulose acetate microspheres can also serve as the core for floc formation, promoting the growth of other flocculants around them.

[0047] A process for removing impurities with sodium acetate solution includes the following steps: S1. After the sodium acetate stock solution is heated by a preheating device, it is introduced into a flocculation tank. Large particulate impurities are removed by a preliminary impurity removal device, and then the pH is stabilized at 7.5-8.0 by a pH adjustment device before entering the flocculation reaction stage. S2. Start stirring, add flocculant solution at 0.1% to 0.5% of the volume of sodium acetate stock solution, stir quickly for 3 to 5 minutes and then stir slowly for 10 to 15 minutes. S3. Transfer the mixture to a sedimentation tank and let it stand. Filter the supernatant through a filtration device to obtain sodium acetate stock solution without impurities.

[0048] By adopting the above technical solutions, this invention constructs a low-modification, high-efficiency impurity removal process that is highly compatible with the existing 60-ton / day sodium acetate production line. It can efficiently remove impurities from the sodium acetate solution by simply using the existing equipment and introducing the flocculant of this invention.

[0049] In some embodiments, the heating temperature of the preheating device is 75–80°C.

[0050] By adopting the above technical solutions, preheating to 75-80℃ reduces the viscosity of the original liquid and increases the diffusion rate of the flocculant.

[0051] In some embodiments, the speed of rapid stirring is 200-300 r / min, and the speed of slow stirring is 50-100 r / min.

[0052] By adopting the above technical solutions, rapid stirring achieves uniform dispersion, while slow stirring promotes floc growth.

[0053] In some embodiments, the settling time is 30 to 60 minutes.

[0054] By adopting the above technical solutions, it can be ensured that the flocs can settle completely. If the flocs do not settle completely, the turbidity of the supernatant will be high, increasing the filtration load.

[0055] In some embodiments, the filtration equipment includes a plate and frame filter and a bag filter.

[0056] By adopting the above technical solutions, plate and frame filters and bag filters have high floc retention efficiency and are not easily clogged.

[0057] The sodium acetate stock solution processed in this invention is a by-product recovery liquid from a polyvinyl alcohol production unit. The insoluble impurities mixed in the stock solution are mainly fine polyvinyl alcohol resin powder and incompletely alcoholyzed polyvinyl acetate resin debris, etc., with a content of about 0.1% to 0.5%. The colloidal impurities are mainly high molecular weight colloids formed by the swelling and dispersion of fine-particle polyvinyl alcohol powder in hot water and some low molecular weight polyvinyl alcohol, with a content of about 0.05% to 0.2%.

[0058] Preparation Example Preparation Example 1: An activated silicic acid was prepared by the following method: Add 1g of water glass (silica content 24.6%, modulus 3.3) to 70mL of 1mol / L hydrochloric acid solution, mix and activate for 3h to obtain activated silicic acid.

[0059] Preparation Example 2: A cellulose acetate microsphere was prepared by the following method: 1 g of microcrystalline cellulose was modified with 5 mL of acetic anhydride at 90 °C for 3 h to obtain cellulose acetate. The cellulose acetate was then prepared into a 4% (w / w) solution using BmimCl. At 80 °C, 30 mL of liquid paraffin and Span 80 (volume ratio 3:1) were added to the cellulose acetate solution and emulsified for 1 h. The solution was then allowed to cool naturally to 50 °C, causing the cellulose acetate solution to coagulate into spheres. Excess deionized water was added to solidify the microspheres. After stirring for 30 min and allowing to stand for a period of time, oil-water phase separation occurred. The microspheres were then separated by washing with deionized water and centrifugation, yielding the cellulose acetate microspheres.

[0060] Example Example 1: A flocculation and impurity removal process using a 60-ton / day sodium acetate solution, comprising the following steps: The sodium acetate stock solution contains 0.2% insoluble impurities, 0.1% colloidal impurities, has a pH of 7.5, and a stock solution temperature of 78℃.

[0061] Flocculant formulation: The high-efficiency flocculant of this application is compounded in the following parts by weight: 50 parts of 26% polyaluminum chloride, 10 parts of cationic polyacrylamide, 10 parts of borax, 20 parts of activated silica prepared in Preparation Example 1, 10 parts of cellulose acetate microspheres prepared in Preparation Example 2, 5 parts of zinc sulfate monohydrate, and 5 parts of magnesium sulfate. The flocculant dispersion with a mass concentration of 10% is prepared with demineralized water.

[0062] S1. After the sodium acetate stock solution is heated to 78°C by the existing preheating device, it is introduced into the flocculation tank. Large particulate impurities are removed by the existing preliminary impurity removal device, and then the pH is stabilized at 7.5 by the pH adjustment device (sodium hydroxide) before entering the flocculation reaction stage. S2. Start stirring (250 r / min), add the flocculant solution of this application at 0.3% of the original liquid volume, stir rapidly for 5 min, then adjust the speed to 80 r / min and stir slowly for 12 min; S3. Transfer the mixture to the original sedimentation tank and let it stand for 45 minutes until the flocs are completely settled. Filter the supernatant through the original plate and frame filter press to obtain sodium acetate stock solution without impurities.

[0063] The process results of this invention are as follows: the treated sodium acetate stock solution is clear and transparent, with no visible impurities or precipitates; the impurity removal rate reaches 99.5%, and the filtration speed is increased to 6.0 m / s. 3 The filter cleaning cycle is 5 times that of the original process, and the cleaning cycle of the filter media is extended to more than 24 hours, which fully meets the production requirements.

[0064] The impurity removal rate is obtained using the following formula: A = (m0 - m1) / m0 × 100%; Where m0 is the total content of insoluble and colloidal impurities in the original solution before treatment, and m1 is the total content of both in the filtrate after treatment.

[0065] Example 2, a flocculation and impurity removal process using a 60-ton / day sodium acetate solution, includes the following steps: The stock solution contains 0.3% insoluble impurities, 0.15% colloidal impurities, has a pH of 7.8, and is at a temperature of 80℃.

[0066] Flocculant formulation: The high-efficiency flocculant of this application is compounded in the following parts by weight: 50 parts of 26% polyaluminum chloride, 10 parts of cationic polyacrylamide, 10 parts of borax, 20 parts of activated silica prepared in Preparation Example 1, 10 parts of cellulose acetate microspheres prepared in Preparation Example 2, 5 parts of zinc sulfate monohydrate, and 5 parts of magnesium sulfate. The flocculant dispersion with a mass concentration of 10% is prepared with demineralized water.

[0067] S1. After the sodium acetate stock solution is heated to 80°C by the existing preheating device, it is introduced into the flocculation tank. Large particulate impurities are removed by the existing preliminary impurity removal device, and then the pH is stabilized at 7.5 by the pH adjustment device (acetic acid) before entering the flocculation reaction stage. S2. Start stirring (280 r / min), add the flocculant solution of this application at 0.4% of the original liquid volume, stir rapidly for 4 min, then adjust the speed to 90 r / min and stir slowly for 13 min; S3. Transfer the mixture to the original sedimentation tank and let it stand for 50 minutes until the flocs are completely settled. Filter the supernatant through the original plate and frame filter press to obtain sodium acetate stock solution without impurities.

[0068] The process results of this invention are as follows: the treated sodium acetate stock solution is clear and transparent, with no visible impurities or precipitates, achieving an impurity removal rate of 99.3%, and the filtration speed is increased to 5.8m. 3 The flocculation effect remained stable at / h, without fluctuations due to changes in the composition of the raw solution, thus verifying the adaptability of the process.

[0069] Comparative Example Comparative Example 1: A flocculation and impurity removal process using a 60-ton / day sodium acetate solution, comprising the following steps: The stock solution contains 0.2% insoluble impurities, 0.1% colloidal impurities, has a pH of 7.5, and is at a temperature of 78℃.

[0070] The sodium acetate stock solution was heated to 78°C using the existing preheating device and then introduced into a flocculation tank. Large particles were removed using the existing preliminary impurity removal device, and the pH was then stabilized at 7.5 using a pH adjustment device (sodium hydroxide) before entering the flocculation reaction stage. 26% polyaluminum chloride was added at a ratio of 0.3% of the stock solution volume, and stirring was carried out continuously at 150 rpm for 10 minutes, followed by a sedimentation time of 60 minutes. A small amount of colloidal impurities still remained in the treated stock solution, and the filtration speed was 1.2 m / s. 3 The filter media has a flow rate of only 85% per hour, and the impurity removal rate is only 85%. The filter media needs to be cleaned every 4 hours, which seriously affects production efficiency.

[0071] Comparative Example 2, a flocculation and impurity removal process using a 60-ton / day sodium acetate solution, comprising the following steps: The sodium acetate stock solution contains 0.2% insoluble impurities, 0.1% colloidal impurities, has a pH of 7.5, and a stock solution temperature of 78℃.

[0072] Flocculant formulation: The high-efficiency flocculant of this application is compounded in the following parts by weight: 50 parts of 26% polyaluminum chloride, 10 parts of cationic polyacrylamide, 10 parts of borax, 20 parts of activated silica prepared in Preparation Example 1, 1 part of cellulose acetate microspheres prepared in Preparation Example 2, 5 parts of zinc sulfate monohydrate, and 5 parts of magnesium sulfate. The flocculant dispersion with a mass concentration of 10% is prepared with demineralized water.

[0073] S1. After the sodium acetate stock solution is heated to 78°C by the existing preheating device, it is introduced into the flocculation tank. Large particulate impurities are removed by the existing preliminary impurity removal device, and then the pH is stabilized at 7.5 by the pH adjustment device (sodium hydroxide) before entering the flocculation reaction stage. S2. Start stirring (250 r / min), add the flocculant solution of this application at 0.3% of the original liquid volume, stir rapidly for 5 min, then adjust the speed to 80 r / min and stir slowly for 12 min; S3. Transfer the mixture to the existing sedimentation tank and let it stand for 45 minutes; filter the supernatant through the existing plate and frame filter to obtain sodium acetate stock solution.

[0074] The process testing results of this invention show that the impurity removal rate reaches 92.6%, and the filtration speed is increased to 4.9m. 3 / h, the filter media needs to be cleaned every 17 hours.

[0075] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A highly efficient flocculant for sodium acetate solution, characterized in that, Based on parts by weight, it comprises the following components: 40-60 parts of polyaluminum chloride, 5-15 parts of polyacrylamide, 5-15 parts of borax, 5-15 parts of cellulose acetate microspheres, 15-25 parts of activated silica, 3-7 parts of zinc sulfate, and 3-7 parts of magnesium sulfate.

2. The high-efficiency flocculant for sodium acetate solution according to claim 1, characterized in that, The polyaluminum chloride contains 26% to 30% alumina.

3. The high-efficiency flocculant for sodium acetate solution according to claim 1, characterized in that, The polyacrylamide is a cationic polyacrylamide.

4. The high-efficiency flocculant for sodium acetate solution according to claim 1, characterized in that, The activated silicic acid is prepared by the following method: Activated silica can be obtained by adding 1g of water glass to 60-80mL of acid activator and activating for 1-5 hours. The acid activators include sulfuric acid, hydrochloric acid, and nitric acid.

5. The high-efficiency flocculant for sodium acetate solution according to claim 1, characterized in that, The cellulose acetate microspheres were prepared by the following method: A1. Cellulose acetate is prepared by reacting cellulose with an acylating agent at 80-90℃ for 2-3 hours; cellulose acetate is then dissolved in an ionic liquid to obtain a cellulose acetate solution. A2. Add an emulsification system to the cellulose acetate solution and emulsify at 80-90℃ for 0.5-1h; lower the temperature to 40-50℃ to allow the cellulose acetate solution to coagulate into spheres; add deionized water to solidify it and form cellulose acetate microspheres. A3. After stirring and standing, cellulose acetate microspheres are separated and washed to obtain the final product.

6. The high-efficiency flocculant for sodium acetate solution according to claim 5, characterized in that, The acylating agent is acetic anhydride; The ionic liquids include BmimCl, EmimCl, and AmimCl liquids; The emulsification system comprises liquid paraffin and Span 80 in a volume ratio of (2-4):1; The cellulose acetate solution has a mass fraction of 3% to 5%.

7. A sodium acetate solution purification process, using the high-efficiency flocculant according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. After the sodium acetate stock solution is heated by a preheating device, it is introduced into a flocculation tank. Large particulate impurities are removed by a preliminary impurity removal device, and then the pH is stabilized at 7.5-8.0 by a pH adjustment device before entering the flocculation reaction stage. S2. Start stirring, add flocculant solution at 0.1% to 0.5% of the volume of sodium acetate stock solution, stir quickly for 3 to 5 minutes and then stir slowly for 10 to 15 minutes. S3. Transfer the mixture to a sedimentation tank and let it stand. Filter the supernatant through a filtration device to obtain sodium acetate stock solution without impurities.

8. The process according to claim 7, characterized in that, The preheating device has a heating temperature of 75-80℃.

9. The process according to claim 7, characterized in that, The speed of rapid stirring is 200-300 r / min, and the speed of slow stirring is 50-100 r / min.

10. The process according to claim 7, characterized in that, The settling time is 30 to 60 minutes; the filtration equipment includes a plate and frame filter and a bag filter.