A method of producing an alcohol-based suspension for produced water

Abstract

This invention discloses a method for producing alcohol-based suspensions for produced water, comprising multiple steps including selecting alcohol-based solvents, adding dispersing agents, adding functional solid particles, precisely adjusting the pH value of the system, thorough mixing and homogenization, and filtration and purification. The alcohol-based suspension produced by this invention has uniformly dispersed internal solid particles and a large specific surface area, exhibiting extremely strong adsorption and capture capabilities. It can rapidly adsorb fine suspended particles, emulsified oils, organic impurities, and other pollutants in produced water, showing significant treatment effects on produced water with high solids content and high oil content. The removal rate of suspended solids can reach over 90%, and the removal rate of oil pollutants can reach over 85%, far superior to traditional flocculation and sedimentation processes. The treated water quality can meet discharge standards or be reused.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a method for producing water using an alcohol-based suspension. Background Technology

[0002] Produced water is a typical industrial wastewater generated during industrial production processes such as mining and oil and gas extraction. It has a wide range of sources, huge discharge volumes, complex water composition, and is difficult to treat. This type of wastewater usually carries a large amount of suspended solids such as stratum sediment and slag powder, as well as petroleum pollutants, heavy metal ions, soluble inorganic salts, and various organic impurities. The high concentration of suspended solids and the diverse composition of pollutants mean that if discharged directly without treatment, it will seriously pollute the surrounding soil and water bodies, damage the ecological environment, and cause a large waste of water resources.

[0003] Currently, conventional treatment processes for produced water in industry mainly rely on natural sedimentation, mechanical filtration, chemical flocculation sedimentation, and oxidative degradation. However, these methods have revealed numerous drawbacks in practical applications. Traditional natural sedimentation has an extremely long treatment cycle and is very ineffective at removing fine suspended particles, failing to meet wastewater discharge standards. Mechanical filtration is prone to filter media clogging and rapid equipment wear, resulting in high maintenance costs and an inability to effectively remove emulsified oily contaminants. Chemical flocculation requires the addition of large amounts of inorganic and organic flocculants, which, while removing some suspended solids, are difficult to control in terms of dosage, easily generating secondary pollution such as flocculated sludge and residual chemical pollutants. Subsequent sludge treatment is cumbersome and further increases treatment costs, failing to meet green and environmentally friendly production requirements. Furthermore, conventional treatment processes generally suffer from low efficiency, weak targeting, and poor adaptability to different water qualities. For produced water with high solids content and high oil content, multiple processes are often required, resulting in lengthy processes and high equipment investment and operating costs.

[0004] With increasingly stringent national ecological and environmental protection policies, the requirements for industrial wastewater reduction, reuse, and harmless treatment are constantly rising. Developing new, efficient, and environmentally friendly produced water treatment technologies has become a key research focus in the water treatment field. Alcohol-based suspensions, as a novel water treatment medium, use alcohol compounds as a base, combined with functional solid particles and additives. They possess multiple functions including adsorption, dispersion, and sedimentation enhancement, exhibiting strong capture and removal capabilities for suspended particles and oil pollutants, with minimal residue and low pollution, demonstrating high application potential. However, at present, the preparation technology of alcohol-based suspensions is still immature, generally suffering from uneven solid particle dispersion, poor suspension stability, easy stratification and agglomeration, and unstable treatment effects, making large-scale industrial application difficult. How to optimize the preparation process, improve the stability and decontamination efficiency of alcohol-based suspensions, while simplifying operation and reducing costs, is a pressing technical challenge that needs to be addressed. Summary of the Invention

[0005] The purpose of this invention is to provide a method for producing alcohol-based suspensions for produced water, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for producing water using an alcohol-based suspension, comprising the following steps: S1: Select alcohol-based solvents, choosing low-carbon alcohol compounds as the base solvent. The low-carbon alcohol compounds are one or more of ethanol, isopropanol, and n-butanol in combination. Industrial-grade alcohol solvents with a purity of ≥95% are preferred, and the solvent water content is strictly controlled to ≤5%. Ethanol, isopropanol, and n-butanol can be compounded according to the actual characteristics of the produced water and treatment requirements. There are no special restrictions on the compounding ratio. The core purpose is to achieve effective dispersion of solid particles and efficient removal of pollutants. The selected industrial-grade alcohol solvents must be free of obvious mechanical impurities and odors to avoid affecting the stability of the suspension and the subsequent produced water treatment effect due to insufficient solvent purity or excessive impurity content. S2: Add a dispersant. Slowly add a dispersant to the alcohol-based solvent while continuously stirring. The dispersant is an environmentally friendly surfactant, specifically selected from one or more combinations of polyvinyl alcohol (PVA), sodium dodecylbenzene sulfonate (SDBS), and polyethylene glycol. The amount of dispersant added is strictly controlled to be 0.5%-2% of the mass of the alcohol-based solvent. During the addition process, maintain a low stirring speed of 50-100 r / min, and keep the stirring time stable at 10-15 minutes. During the stirring process, the dissolution state of the dispersant needs to be continuously observed until the dispersant is completely dissolved in the alcohol-based solvent to form a uniform and transparent mixed solution. This will prevent problems such as uneven dispersion of solid particles and stratification of suspension caused by incomplete dissolution of the dispersant. S3: Add functional solid particles. Slowly add pretreated functional solid particles to the homogeneous and transparent mixed solution obtained in S2. The solid particles are selected from one or more of slag, bentonite, activated carbon, and diatomaceous earth. The solid particles need to be pretreated by crushing and sieving. After crushing, they are sieved through a standard sieve to ensure that the particle size is accurately controlled within the range of 10-100 micrometers. The amount of solid particles added is strictly controlled to be 15%-30% of the total mass of the mixed solution. During the addition process, the same low-speed stirring speed as in S2 is maintained to allow the solid particles to gradually immerse in the mixed solution and disperse slowly. This prevents the agglomeration of solid particles caused by adding a large amount at once and ensures that the solid particles are initially uniformly dispersed in the mixed system. S4: Precisely adjust the pH value of the system. Use a special acid-base regulator to precisely control the pH value of the solid particle-alcohol mixture obtained in S3. The acid regulator is a 5%-10% dilute hydrochloric acid or dilute sulfuric acid, and the alkaline regulator is a 5%-10% sodium hydroxide solution or calcium hydroxide solution. During the adjustment process, the regulator needs to be added while stirring, and the pH value of the mixture should be monitored in real time. The pH value of the mixture should be stably adjusted to the neutral to slightly alkaline range of 7-9. After the adjustment is completed, continue stirring for 5-10 minutes to ensure that the pH value of the mixture is uniform and stable, and avoid local pH value deviations from affecting the performance of the suspension. S5: Thoroughly mix and homogenize. Transfer the pH-adjusted mixture from S4 to a high-speed mixer for thorough homogenization. Increase the mixing speed to 300-600 r / min and strictly control the mixing time to 30-60 minutes. The mixing time can be flexibly adjusted according to the amount of solid particles added. If the amount of solid particles added is in the lower limit range of 15%-20%, the mixing time can be controlled at 30-45 minutes; if the amount of solid particles added is in the upper limit range of 20%-30%, the mixing time can be extended to 45-60 minutes. During the mixing process, the state of the mixture needs to be continuously observed until the mixture forms a homogeneous suspension system with uniform texture, no obvious lumps, and no stratification. This ensures that the solid particles, dispersant, and alcohol solvent are fully integrated, thereby improving the stability of the suspension. S6: Filtration and purification treatment. The homogenized mixture from S5 is slowly passed through a microporous filter for filtration and purification. A microporous membrane with a pore size of 5-10 micrometers is selected for filtration. During the filtration process, the flow rate is controlled at 5-10 L / h to ensure thorough filtration and effectively remove undispersed particles exceeding the standard size, a small amount of agglomerates generated during stirring, and any mechanical impurities that may be present in the mixture. After filtration, a clear and homogeneous finished alcohol-based suspension is obtained. The finished alcohol-based suspension can be directly used in the produced water treatment site, or it can be moderately concentrated using a vacuum concentration device. After concentration, it is easier to store and transport. When using the concentrated suspension, it can be diluted with clean water or produced water according to the specified concentration according to the actual treatment needs before it is put into use.

[0007] Preferably, the industrial-grade alcohol solvent meets the purity standards and is free of mechanical and harmful impurities. The low-carbon alcohol compounds have moderate polarity, possessing both good solubility to fully dissolve subsequently added dispersants and other additives, and excellent dispersibility to effectively coat the surface of solid particles, reducing the cohesion between solid particles. At the same time, they have moderate volatility, allowing them to evaporate naturally or be separated through simple processes during subsequent treatment, without causing secondary pollution to the produced water quality, thus meeting the core requirements of green and environmentally friendly produced water treatment.

[0008] Preferably, the dispersant is an environmentally friendly, non-toxic surfactant that will not pollute water bodies or the ecological environment. Its core function is to effectively reduce the interfacial tension between solid and liquid, break the van der Waals forces between solid particles, inhibit the aggregation tendency of solid particles, significantly improve the dispersion uniformity of solid particles in the alcohol-based system, and form a protective film on the surface of solid particles to further prevent solid particles from settling and agglomerating, greatly extend the stable storage time of the suspension, and ensure that the suspension maintains a good dispersion state during storage, transportation and use.

[0009] Preferably, the particle size range of the solid particles is strictly controlled to be 10-100 micrometers. Solid particles in this size range have a moderate specific surface area, which can ensure a large adsorption capacity and efficiently adsorb suspended fine sand, emulsified oil, organic impurities and some heavy metal ions in the extracted water. At the same time, it can avoid the rapid sedimentation of solid particles in the alcohol system due to excessive particle size, and also prevent the problem of difficult subsequent filtration and separation and difficult recycling due to excessive particle size. It achieves a dual balance between adsorption performance and separation convenience.

[0010] Preferably, the pH value is adjusted to a neutral to slightly alkaline range of 7-9. This range not only matches the conventional water quality characteristics of most produced water (most produced water has a pH value between 6 and 9), avoiding excessive addition of acid-base regulators that could cause acid-base imbalance and secondary pollution, but also further enhances the dispersing effect of the dispersant, adjusts the charge distribution on the surface of solid particles, stabilizes the suspension state of solid particles in the alcohol-based system, effectively improves the overall stability of the suspension, and ensures that the alcohol-based suspension can maintain its optimal working state during subsequent treatment, achieving efficient removal of pollutants.

[0011] Preferably, the core purpose of the high-speed stirring is to break up the agglomerates of residual solid particles in the mixture, so that the solid particles, dispersant, and alcohol-based solvent can be fully integrated, ensuring that the solid particles can be uniformly dispersed in the alcohol-based system to form a stable suspension system. At the same time, high-speed stirring can further enhance the adsorption of the dispersant on the surface of the solid particles, improve the dispersion effect, and avoid problems such as excessively high local concentration of the suspension and clumping and stratification caused by uneven mixing, thus ensuring that the suspension has a uniform texture and stable performance.

[0012] Preferably, the pore size of the microporous filter membrane is precisely controlled to be 5-10 micrometers. This pore size can accurately match the particle size range of solid particles, effectively removing undispersed particles exceeding the standard size in the mixture, a small amount of agglomerates generated during stirring, and mechanical impurities introduced from the raw materials. At the same time, it will not intercept functional solid particles that meet the requirements, ensuring that the filtered alcohol-based suspension has a uniform texture and stable performance, and avoiding impurities from affecting the subsequent treatment effect of the extracted water.

[0013] Preferably, the pretreatment of the solid particles further includes drying, which is carried out in a constant temperature drying oven. The drying temperature is strictly controlled at 80-120℃, and the drying time is stably controlled at 2-4 hours. During the drying process, the solid particles need to be turned over regularly to ensure that the solid particles are heated evenly, thoroughly remove the moisture and soluble impurities adsorbed on the surface of the solid particles, and avoid the interaction between the moisture on the surface of the solid particles and the alcohol-based solvent, which would lead to the agglomeration of solid particles and a decrease in the stability of the suspension. At the same time, removing impurities can improve the adsorption performance of the solid particles and ensure the effect of subsequent produced water treatment.

[0014] Preferably, the high-speed mixing equipment is a high-speed shear emulsifier, which has multiple functions of shearing, mixing and emulsification, and can more efficiently break up solid particle agglomerates and improve the mixing and homogenization effect. During the mixing process, the temperature of the mixture needs to be kept stable at 20-35℃ by a constant temperature device. This temperature range is the optimal fusion temperature of alcohol-based solvent, dispersant and solid particles. It can avoid the rapid evaporation of alcohol-based solvent due to excessive temperature, which would cause waste of raw materials and imbalance of suspension concentration. At the same time, it can prevent the dispersant from failing and the surface structure of solid particles from being damaged due to excessive temperature, and ensure the stability of suspension performance.

[0015] Preferably, the pressure of the vacuum concentration is strictly controlled between 0.05-0.1 MPa. This pressure range can effectively reduce the evaporation boiling point of the alcohol-based solvent, preventing the solvent from evaporating too quickly and causing solid particles to agglomerate. At the same time, it can ensure concentration efficiency and shorten the concentration cycle. The concentration temperature is stably controlled between 40-60℃. This temperature range can accelerate the evaporation rate of the alcohol-based solvent, further improving the concentration efficiency, while preventing the dispersant from failing and the adsorption performance of solid particles from being damaged due to excessively high temperatures, ensuring that the performance of the concentrated suspension is not affected. The solid particle content in the concentrated alcohol-based suspension is precisely controlled between 35%-50%. This content range can take into account both the stability of the suspension and the ease of use. It can prevent the suspension from becoming viscous, difficult to add, and causing pipeline blockage due to excessively high solid particle content, and it can also prevent the solid particle content from affecting the produced water treatment effect due to excessively low solid particle content. It can ensure that the concentrated suspension can be directly used for produced water treatment after proportional dilution without additional adjustment of the composition.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the alcohol-based suspension prepared by the invention has uniformly dispersed solid particles and a large specific surface area, and has extremely strong adsorption and capture capabilities. It can quickly adsorb fine suspended particles, emulsified oils, organic impurities and other pollutants in the produced water. It has a significant effect on the treatment of produced water with high solid content and high oil pollution. The removal rate of suspended solids can reach more than 90%, and the removal rate of oil pollutants can reach more than 85%, which is far superior to traditional flocculation and sedimentation processes. The treated water quality can meet the standards for discharge or reuse. Through multiple processes including dispersant optimization, pH adjustment, and high-speed homogenization, the resulting alcohol-based suspension exhibits extremely high stability. It can be stored at room temperature in a sealed container for more than 30 days without any stratification, clumping, or sedimentation, maintaining stable performance and continuously and efficiently exerting its treatment effect. It does not require on-site preparation and is suitable for batch preparation and storage for later use, making it suitable for remote operation scenarios such as oil fields and mining areas. This preparation method does not require the addition of large amounts of highly corrosive and persistent chemical agents. The alcohol-based solvents and dispersants used are all environmentally friendly raw materials that are easily degradable and leave no toxic residues. The process does not generate large amounts of secondary pollutants such as chemical sludge and toxic waste liquid, thus solving the problem of pollution residues in traditional chemical treatment methods and meeting the requirements of green industrial production and ecological environmental protection. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a technical solution: a method for producing water using an alcohol-based suspension, comprising the following steps: S1: Select alcohol-based solvents, choosing low-carbon alcohol compounds as the base solvent. The low-carbon alcohol compounds are one or more of ethanol, isopropanol, and n-butanol in combination. Industrial-grade alcohol solvents with a purity of ≥95% are preferred, and the solvent water content is strictly controlled to ≤5%. Ethanol, isopropanol, and n-butanol can be compounded according to the actual characteristics of the produced water and treatment requirements. There are no special restrictions on the compounding ratio. The core purpose is to achieve effective dispersion of solid particles and efficient removal of pollutants. The selected industrial-grade alcohol solvents must be free of obvious mechanical impurities and odors to avoid affecting the stability of the suspension and the subsequent produced water treatment effect due to insufficient solvent purity or excessive impurity content. S2: Add a dispersant. Slowly add a dispersant to the alcohol-based solvent while continuously stirring. The dispersant is an environmentally friendly surfactant, specifically selected from one or more combinations of polyvinyl alcohol (PVA), sodium dodecylbenzene sulfonate (SDBS), and polyethylene glycol. The amount of dispersant added is strictly controlled to be 0.5%-2% of the mass of the alcohol-based solvent. During the addition process, maintain a low stirring speed of 50-100 r / min, and keep the stirring time stable at 10-15 minutes. During the stirring process, the dissolution state of the dispersant needs to be continuously observed until the dispersant is completely dissolved in the alcohol-based solvent to form a uniform and transparent mixed solution. This will prevent problems such as uneven dispersion of solid particles and stratification of suspension caused by incomplete dissolution of the dispersant. S3: Add functional solid particles. Slowly add pretreated functional solid particles to the homogeneous and transparent mixed solution obtained in S2. The solid particles are selected from one or more of slag, bentonite, activated carbon, and diatomaceous earth. The solid particles need to undergo two pretreatment steps: crushing and sieving. After crushing, they are sieved through a standard sieve to ensure that the particle size is accurately controlled within the range of 10-100 micrometers. Solid particles in this particle size range have a moderate specific surface area, which can ensure a large adsorption capacity and can efficiently adsorb suspended fine sand, emulsified oil, organic impurities, and some other pollutants in the produced water. This method separates heavy metal ions while avoiding the rapid sedimentation of solid particles in the alcohol system due to excessively large particle size. It also prevents the problems of difficult subsequent filtration and separation and recycling due to excessively small particle size, achieving a dual balance between adsorption performance and ease of separation. The amount of solid particles added is strictly controlled to be 15%-30% of the total mass of the mixed solution. During the addition process, a low-speed stirring at the same speed as S2 is maintained to allow the solid particles to gradually immerse in the mixed solution and disperse slowly, preventing the agglomeration of solid particles caused by a large amount of addition at one time, and ensuring that the solid particles are initially uniformly dispersed in the mixed system.

[0019] S4: Precisely adjust the pH value of the system. Use a special acid-base regulator to precisely control the pH value of the solid particle-alcohol mixture obtained in S3. The acid regulator is a 5%-10% dilute hydrochloric acid or dilute sulfuric acid, and the alkaline regulator is a 5%-10% sodium hydroxide solution or calcium hydroxide solution. During the adjustment process, the regulator needs to be added while stirring, and the pH value of the mixture should be monitored in real time. The pH value of the mixture should be stably adjusted to the neutral to slightly alkaline range of 7-9. After the adjustment is completed, continue stirring for 5-10 minutes to ensure that the pH value of the mixture is uniform and stable, and avoid local pH value deviations from affecting the performance of the suspension. S5: Thoroughly mix and homogenize. Transfer the pH-adjusted mixture from S4 to a high-speed mixer for thorough homogenization. Increase the mixing speed to 300-600 r / min and strictly control the mixing time to 30-60 minutes. The mixing time can be flexibly adjusted according to the amount of solid particles added. If the amount of solid particles added is in the lower limit range of 15%-20%, the mixing time can be controlled at 30-45 minutes; if the amount of solid particles added is in the upper limit range of 20%-30%, the mixing time can be extended to 45-60 minutes. During the mixing process, the state of the mixture needs to be continuously observed until the mixture forms a homogeneous suspension system with uniform texture, no obvious lumps, and no stratification. This ensures that the solid particles, dispersant, and alcohol solvent are fully integrated, thereby improving the stability of the suspension. S6: Filtration and purification treatment. The homogenized mixture from S5 is slowly passed through a microporous filter for filtration and purification. A microporous membrane with a pore size of 5-10 micrometers is selected for filtration. During the filtration process, the flow rate is controlled at 5-10 L / h to ensure thorough filtration and effectively remove undispersed particles exceeding the standard size, a small amount of agglomerates generated during stirring, and any mechanical impurities that may be present in the mixture. After filtration, a clear and homogeneous finished alcohol-based suspension is obtained. The finished alcohol-based suspension can be directly used in the produced water treatment site, or it can be moderately concentrated using a vacuum concentration device. After concentration, it is easier to store and transport. When using the concentrated suspension, it can be diluted with clean water or produced water according to the specified concentration according to the actual treatment needs before it is put into use.

[0020] Example 1 S1: Select alcohol-based solvents, using a mixture of ethanol and isopropanol (mixing ratio 7:3), using industrial-grade ethanol with a purity of 98% and industrial-grade isopropanol with a purity of 97%. After mixing, the solvent water content is tested to be 3.2%, with no mechanical impurities and no odor, meeting the requirements. S2: Add dispersant. Take 100 kg of the above alcohol-based solvent, keep stirring at a low speed of 70 r / min, and slowly add 1.2 kg of polyvinyl alcohol (PVA) (the amount added is 1.2% of the mass of the alcohol-based solvent). Continue stirring for 12 minutes until the PVA is completely dissolved and a uniform and transparent mixed solution is formed. S3: Add functional solid particles, using a blend of activated carbon and bentonite (4:6 ratio). Pre-treat the particles by placing them in a constant temperature drying oven at 85℃ for 3 hours, turning them periodically to ensure even heating. After drying, pulverize and sieve through a standard mesh to control the particle size to 20-60 micrometers. Take 25 kg of the pre-treated solid particles (20.8% of the total mass of the mixed solution) and slowly add them to the above mixed solution, maintaining a low stirring speed of 70 r / min to ensure gradual dispersion of the solid particles without agglomeration or clumping. S4: Adjust the pH value using an 8% sodium hydroxide solution as the regulator. Add the solution while stirring, monitor the pH value in real time, and adjust the pH value of the mixture to 8.2. After adjustment, continue stirring for 8 minutes to ensure that the pH value is uniform and stable. S5: Homogenization treatment. Transfer the mixture to a high-speed shear emulsifier, maintain a constant temperature of 28°C, adjust the speed to 450 r / min, and stir for 50 minutes until the mixture forms a homogeneous suspension system with uniform texture, no lumps, and no stratification. S6: Filtration and purification. A microporous filter membrane with a pore size of 8 micrometers is selected and the filtration flow rate is controlled at 8L / h to filter the mixture and remove insufficiently dispersed particles and impurities, resulting in 122.3kg of finished alcohol-based suspension.

[0021] Performance testing: The finished suspension showed no stratification or clumping after 35 days of sealed storage at room temperature; when used to treat produced water from oilfields with an oil content of 850 mg / L and a suspended solids concentration of 1200 mg / L, the dosage was 0.3% of the produced water volume. After treatment, the oil content decreased to 62 mg / L (removal rate 92.7%), and the suspended solids concentration decreased to 98 mg / L (removal rate 91.8%), meeting the standards for reuse of produced water from oilfields.

[0022] Example 2 S1: Select alcohol-based solvents, using isopropanol and n-butanol in a 6:4 ratio. Use industrial-grade isopropanol with 95% purity and industrial-grade n-butanol with 96% purity. After mixing, the solvent water content is 4.5%, with no mechanical impurities and no odor, meeting the requirements. S2: Add dispersant. Take 100 kg of the above alcohol-based solvent, keep stirring at a low speed of 50 r / min, and slowly add 0.8 kg of sodium dodecylbenzenesulfonate (SDBS) (the amount added is 0.8% of the mass of the alcohol-based solvent). Continue stirring for 15 minutes until SDBS is completely dissolved and a homogeneous and transparent mixed solution is formed. S3: Add functional solid particles, using a mixture of slag and diatomaceous earth (5:5 ratio). Pre-treat the particles by placing them in a constant temperature drying oven at 100℃ for 2.5 hours, turning them regularly to ensure even heating. After drying, pulverize and sieve through a standard mesh to control the particle size to 40-80 micrometers. Take 30 kg of the pre-treated solid particles (23.1% of the total mass of the mixed solution) and slowly add them to the above mixed solution, maintaining a low stirring speed of 50 r / min to ensure gradual dispersion of the solid particles without agglomeration. S4: Adjust the pH value using a 10% (w / w) calcium hydroxide solution as the regulator. Add the solution while stirring, monitor the pH value in real time, and adjust the pH value of the mixture to 7.8. After adjustment, continue stirring for 10 minutes to ensure that the pH value is uniform and stable. S5: Homogenization treatment. Transfer the mixture to a high-speed shear emulsifier, maintain a constant temperature of 25°C, adjust the speed to 500 r / min, and stir for 60 minutes until the mixture forms a homogeneous suspension system with uniform texture, no lumps, and no stratification. S6: Filtration and purification. A microporous filter membrane with a pore size of 10 micrometers is selected and the filtration flow rate is controlled at 6L / h to filter the mixture and remove insufficiently dispersed particles and impurities, resulting in 127.1kg of finished alcohol suspension. The finished product is then concentrated under reduced pressure at 0.08MPa and 50℃ to a solid particle content of 42%, which facilitates storage and transportation.

[0023] Performance testing: The concentrated suspension showed no stratification or clumping after being stored in a sealed container at room temperature for 32 days. After dilution, it was used to treat produced water from a mining area with a suspended solids concentration of 1800 mg / L and a small amount of oil. The dosage was 0.4% of the produced water volume. After treatment, the suspended solids concentration decreased to 142 mg / L (removal rate of 92.1%), the oil pollutant removal rate was 88.3%, and the water quality met the discharge standards for mining wastewater.

[0024] Example 3 S1: An alcohol-based solvent was selected, using a single industrial-grade ethanol (95% purity). The solvent's water content was tested to be 4.8%, with no mechanical impurities or odor, meeting the requirements and reducing raw material costs. S2: Add dispersant. Take 100 kg of the above alcohol-based solvent, keep stirring at a low speed of 100 r / min, slowly add 0.5 kg of polyethylene glycol (the amount added is 0.5% of the mass of the alcohol-based solvent), and continue stirring for 10 minutes until the polyethylene glycol is completely dissolved to form a homogeneous and transparent mixed solution. S3: Add functional solid particles. Select industrial slag (recycled) as the single solid particle and pre-treat it: Place the slag in a constant temperature drying oven and dry it at 110℃ for 2 hours. Turn it regularly to ensure uniform heating. After drying, crush it and sieve it through a standard sieve to control the particle size to 60-100 micrometers. Take 18 kg of the pre-treated slag (15.2% of the total mass of the mixed solution) and slowly add it to the above mixed solution. Maintain low-speed stirring at 100 r / min to ensure that the solid particles gradually disperse without agglomeration. S4: Adjust the pH value by using a mixture of 5% hydrochloric acid and 5% sodium hydroxide solution. Add the solution while stirring, and monitor the pH value in real time. Adjust the pH value of the mixture to 7.2. After adjustment, continue stirring for 5 minutes to ensure that the pH value is uniform and stable. S5: Homogenization treatment. Transfer the mixture to a high-speed shear emulsifier, maintain a constant temperature of 32°C, adjust the speed to 350 r / min, and stir for 35 minutes until the mixture forms a homogeneous suspension system with uniform texture, no lumps, and no stratification. S6: Filtration and purification. A microporous filter membrane with a pore size of 5 micrometers is selected and the filtration flow rate is controlled at 10L / h to filter the mixture and remove insufficiently dispersed particles and impurities, resulting in 115.7kg of finished alcohol-based suspension.

[0025] Performance testing: The finished suspension showed no stratification or clumping after 38 days of sealed storage at room temperature; when used to treat ordinary produced water with a suspended solids concentration of 1000 mg / L and an oil content of 500 mg / L, the dosage was 0.25% of the produced water volume. After treatment, the suspended solids concentration decreased to 89 mg / L (removal rate of 91.1%), the oil pollutant removal rate was 85.6%, the water quality met the standards, and the raw material cost was reduced by more than 30% compared with Examples 1 and 2, making it suitable for large-scale industrial production.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for producing water using an alcohol-based suspension, characterized in that: Includes the following steps: S1: Select alcohol-based solvents, choosing low-carbon alcohol compounds as the base solvent. The low-carbon alcohol compounds are one or more of ethanol, isopropanol, and n-butanol in combination. Industrial-grade alcohol solvents with a purity of ≥95% are preferred, and the solvent water content is strictly controlled to ≤5%. Ethanol, isopropanol, and n-butanol can be compounded according to the actual characteristics of the produced water and treatment requirements. There are no special restrictions on the compounding ratio. The core purpose is to achieve effective dispersion of solid particles and efficient removal of pollutants. The selected industrial-grade alcohol solvents must be free of obvious mechanical impurities and odors to avoid affecting the stability of the suspension and the subsequent produced water treatment effect due to insufficient solvent purity or excessive impurity content. S2: Add a dispersant. Slowly add a dispersant to the alcohol-based solvent while continuously stirring. The dispersant is an environmentally friendly surfactant, specifically selected from one or more combinations of polyvinyl alcohol (PVA), sodium dodecylbenzene sulfonate (SDBS), and polyethylene glycol. The amount of dispersant added is strictly controlled to be 0.5%-2% of the mass of the alcohol-based solvent. During the addition process, maintain a low stirring speed of 50-100 r / min, and keep the stirring time stable at 10-15 minutes. During the stirring process, the dissolution state of the dispersant needs to be continuously observed until the dispersant is completely dissolved in the alcohol-based solvent to form a uniform and transparent mixed solution. This will prevent problems such as uneven dispersion of solid particles and stratification of suspension caused by incomplete dissolution of the dispersant. S3: Add functional solid particles. Slowly add pretreated functional solid particles to the homogeneous and transparent mixed solution obtained in S2. The solid particles are selected from one or more of slag, bentonite, activated carbon, and diatomaceous earth. The solid particles need to be pretreated by crushing and sieving. After crushing, they are sieved through a standard sieve to ensure that the particle size is accurately controlled within the range of 10-100 micrometers. The amount of solid particles added is strictly controlled to be 15%-30% of the total mass of the mixed solution. During the addition process, the same low-speed stirring speed as in S2 is maintained to allow the solid particles to gradually immerse in the mixed solution and disperse slowly. This prevents the agglomeration of solid particles caused by adding a large amount at once and ensures that the solid particles are initially uniformly dispersed in the mixed system. S4: Precisely adjust the pH value of the system. Use a special acid-base regulator to precisely control the pH value of the solid particle-alcohol mixture obtained in S3. The acid regulator is a 5%-10% dilute hydrochloric acid or dilute sulfuric acid, and the alkaline regulator is a 5%-10% sodium hydroxide solution or calcium hydroxide solution. During the adjustment process, the regulator needs to be added while stirring, and the pH value of the mixture should be monitored in real time. The pH value of the mixture should be stably adjusted to the neutral to slightly alkaline range of 7-9. After the adjustment is completed, continue stirring for 5-10 minutes to ensure that the pH value of the mixture is uniform and stable, and avoid local pH value deviations from affecting the performance of the suspension. S5: Thoroughly mix and homogenize. Transfer the pH-adjusted mixture from S4 to a high-speed mixer for thorough homogenization. Increase the mixing speed to 300-600 r / min and strictly control the mixing time to 30-60 minutes. The mixing time can be flexibly adjusted according to the amount of solid particles added. If the amount of solid particles added is in the lower limit range of 15%-20%, the mixing time can be controlled at 30-45 minutes; if the amount of solid particles added is in the upper limit range of 20%-30%, the mixing time can be extended to 45-60 minutes. During the mixing process, the state of the mixture needs to be continuously observed until the mixture forms a homogeneous suspension system with uniform texture, no obvious lumps, and no stratification. This ensures that the solid particles, dispersant, and alcohol solvent are fully integrated, thereby improving the stability of the suspension. S6: Filtration and purification treatment. The homogenized mixture from S5 is slowly passed through a microporous filter for filtration and purification. A microporous membrane with a pore size of 5-10 micrometers is selected for filtration. During the filtration process, the flow rate is controlled at 5-10 L / h to ensure thorough filtration and effectively remove undispersed particles exceeding the standard size, a small amount of agglomerates generated during stirring, and any mechanical impurities that may be present in the mixture. After filtration, a clear and homogeneous finished alcohol-based suspension is obtained. The finished alcohol-based suspension can be directly used in the produced water treatment site, or it can be moderately concentrated using a vacuum concentration device. After concentration, it is easier to store and transport. When using the concentrated suspension, it can be diluted with clean water or produced water according to the specified concentration according to the actual treatment needs before it is put into use.

2. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The industrial-grade alcohol solvents meet purity standards and are free of mechanical and harmful impurities. The low-carbon alcohol compounds have moderate polarity, possessing both good solubility to fully dissolve subsequently added dispersants and other additives, and excellent dispersibility to effectively coat the surface of solid particles, reducing the cohesion between solid particles. At the same time, they have moderate volatility, allowing them to evaporate naturally or be separated through simple processes during subsequent treatment, without causing secondary pollution to the produced water quality, thus meeting the core requirements of green and environmentally friendly produced water treatment.

3. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The dispersant is an environmentally friendly, non-toxic surfactant that will not pollute water bodies or the ecological environment. Its core function is to effectively reduce the interfacial tension between solid and liquid, break the van der Waals forces between solid particles, inhibit the aggregation tendency of solid particles, significantly improve the dispersion uniformity of solid particles in alcohol-based systems, and form a protective film on the surface of solid particles to further prevent solid particles from settling and agglomerating. This greatly extends the stable storage time of the suspension and ensures that the suspension maintains a good dispersion state during storage, transportation, and use.

4. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The particle size of the solid particles is strictly controlled within the range of 10-100 micrometers. Solid particles within this size range have a moderate specific surface area, which can ensure a large adsorption capacity and efficiently adsorb suspended fine sand, emulsified oil, organic impurities and some heavy metal ions in the extracted water. At the same time, it can also prevent the solid particles from rapidly settling in the alcohol system due to excessively large particle size, and prevent the problems of subsequent filtration and separation difficulties and recycling difficulties due to excessively small particle size. It achieves a dual balance between adsorption performance and separation convenience.

5. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The pH value is adjusted to a neutral to slightly alkaline range of 7-9. This range not only matches the typical water quality characteristics of most produced water (most produced water has a pH value between 6 and 9), avoiding excessive addition of acid-base regulators that could cause acid-base imbalance and secondary pollution, but also further enhances the dispersing effect of the dispersant, regulates the charge distribution on the surface of solid particles, stabilizes the suspension state of solid particles in the alcohol-based system, effectively improves the overall stability of the suspension, and ensures that the alcohol-based suspension can maintain its optimal working state during subsequent treatment, achieving efficient removal of pollutants.

6. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The core purpose of the high-speed stirring is to break up the agglomerates of residual solid particles in the mixture, so that the solid particles, dispersant, and alcohol-based solvent can be fully integrated, ensuring that the solid particles can be uniformly dispersed in the alcohol-based system to form a stable suspension system. At the same time, high-speed stirring can further enhance the adsorption of the dispersant on the surface of the solid particles, improve the dispersion effect, and avoid problems such as excessively high local concentration of the suspension and clumping and stratification caused by uneven mixing, thus ensuring that the suspension has a uniform texture and stable performance.

7. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The microporous filter membrane has a pore size precisely controlled to be 5-10 micrometers. This pore size can be precisely matched to the particle size range of solid particles, effectively removing undispersed particles exceeding the standard size in the mixture, a small amount of agglomerates generated during stirring, and mechanical impurities introduced from the raw materials. At the same time, it will not intercept functional solid particles that meet the requirements, ensuring that the filtered alcohol-based suspension has a uniform texture and stable performance, and avoiding impurities from affecting the subsequent treated water effect.

8. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The pretreatment of the solid particles also includes drying, which is carried out in a constant temperature drying oven. The drying temperature is strictly controlled between 80-120℃, and the drying time is stably controlled between 2-4 hours. During the drying process, the solid particles need to be turned over regularly to ensure that the solid particles are heated evenly, thoroughly remove the moisture and soluble impurities adsorbed on the surface of the solid particles, and avoid the interaction between the moisture on the surface of the solid particles and the alcohol-based solvent, which would lead to the agglomeration of solid particles and a decrease in the stability of the suspension. At the same time, removing impurities can improve the adsorption performance of the solid particles and ensure the effect of subsequent produced water treatment.

9. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The high-speed mixing equipment uses a high-speed shear emulsifier, which has multiple functions of shearing, mixing, and emulsification. It can break up solid particle agglomerates more efficiently and improve the mixing and homogenization effect. During the mixing process, the temperature of the mixture needs to be kept stable at 20-35℃ by a constant temperature device. This temperature range is the optimal fusion temperature of alcohol-based solvent, dispersant and solid particles. It can avoid the rapid evaporation of alcohol-based solvent due to excessive temperature, which would cause waste of raw materials and imbalance of suspension concentration. At the same time, it can prevent the dispersant from failing and the surface structure of solid particles from being damaged due to excessive temperature, thus ensuring the stability of suspension performance.

10. The method for producing water with an alcohol-based suspension according to claim 1, characterized in that: The pressure of the vacuum concentration is strictly controlled between 0.05-0.1 MPa. This pressure range effectively reduces the boiling point of the alcohol-based solvent, preventing the solid particles from agglomerating due to rapid solvent evaporation. It also ensures concentration efficiency and shortens the concentration cycle. The concentration temperature is stably controlled between 40-60℃. This temperature range accelerates the evaporation rate of the alcohol-based solvent, further improving concentration efficiency, while preventing excessively high temperatures from causing dispersant failure and impairing the adsorption performance of solid particles, ensuring that the performance of the concentrated suspension is not affected. The solid particle content in the finished alcohol-based suspension is precisely controlled between 35%-50%. This content range balances the stability of the suspension with ease of use, avoiding both excessively high solid particle content leading to viscous suspension, difficulty in addition, and pipeline blockage, and excessively low solid particle content affecting the produced water treatment effect. This ensures that the concentrated suspension, after proportional dilution, can be directly used for produced water treatment without additional component adjustments.