A waste treatment device for isothiazolinone production

Abstract

This utility model discloses a waste treatment device for isothiazolinone production, relating to the field of isothiazolinone production technology. The waste tank is connected to a first filter, the first filter is connected to a settling tank, the settling tank is connected to a distillation tank, the distillation tank is connected to a degradation tank, the degradation tank is connected to a sedimentation tank, the sedimentation tank is connected to a second filter, the second filter is connected to a nanofiltration membrane device, and the nanofiltration membrane device is connected to a treatment water tank. This device can effectively remove harmful substances from the isothiazolinone production waste, achieving harmless treatment of the waste and also realizing resource recycling to a certain extent, thus possessing good environmental and economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of isothiazolinone production technology, specifically to an isothiazolinone production waste treatment device. Background Technology

[0002] Isothiazolinones are a class of highly effective, broad-spectrum bactericides widely used in industrial circulating water systems, papermaking, and coatings. The production of isothiazolinones generates large quantities of wastewater containing organic matter and heavy metals. Direct discharge of this wastewater without effective treatment will not only cause serious environmental pollution but may also harm human health. Currently, traditional wastewater treatment methods suffer from poor treatment efficiency, high costs, and complex operations, making it difficult to meet increasingly stringent environmental protection requirements. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a waste treatment device for isothiazolinone production, which has good treatment effect, simple operation and environmental friendliness, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A waste treatment device for isothiazolinone production includes a waste tank. The outlet of the waste tank is connected to a first filter via a pipeline. The liquid phase outlet of the first filter is connected to a settling tank via a pipeline. The outlet of the settling tank is connected to a distillation tank via a pipeline. The bottom outlet of the distillation tank is connected to a degradation tank via a pipeline. The bottom of the degradation tank is connected to a sedimentation tank via a pipeline. The inlet of the sedimentation tank is connected to a sodium sulfide tank via a pipeline. The outlet of the sedimentation tank is connected to a second filter via a pipeline. The liquid phase outlet of the second filter is connected to a nanofiltration membrane device via a pipeline. The outlet of the nanofiltration membrane device is connected to a treated water tank via a pipeline.

[0006] As an improved technical solution, the liquid phase of the first filter is connected to a centrifuge via a pipeline, and the liquid phase outlet of the centrifuge is connected to the settling tank via a pipeline.

[0007] As an improved technical solution, the solid phase outlet of the first filter is connected to a first recovery tank, the solid phase outlet of the centrifuge is connected to a second recovery tank, the outlets of the first recovery tank and the second recovery tank are respectively connected to an acid leaching tank through pipelines, the inlet of the acid leaching tank is connected to a sulfuric acid solution tank through a pipeline, the outlet of the acid leaching tank is connected to a plate and frame filter press through a pipeline, and the liquid phase outlet of the plate and frame filter press is connected to a first heavy metal recovery tank through a pipeline.

[0008] As an improved technical solution, the outlets of the first recycling tank and the second recycling tank are respectively connected to a crushing tank via pipelines, and the outlet of the crushing tank is connected to the acid leaching tank.

[0009] As an improved technical solution, the acid leaching tank is equipped with an online pH sensor, and the outlet pipe of the sulfuric acid solution tank is equipped with a shut-off valve. The online pH sensor and the shut-off valve are interlocked to the control system.

[0010] As an improved technical solution, the top outlet of the degradation tank is connected to a gas recovery tank via a pipeline.

[0011] As a preferred technical solution, the solid phase outlet of the second filter is connected to a second heavy metal recovery tank via a pipeline.

[0012] As a preferred technical solution, the top gas phase outlet of the distillation tank is connected to an organic solvent recovery tank via a pipeline.

[0013] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0014] This utility model discloses a waste treatment device for isothiazolinone production, comprising a waste tank, an outlet of which is connected to a first filter via a pipeline, a liquid phase outlet of the first filter via a pipeline to a settling tank, an outlet of the settling tank via a pipeline to a distillation tank, a bottom outlet of the distillation tank via a pipeline to a degradation tank, a bottom of the degradation tank via a pipeline to a sedimentation tank, an inlet of the sedimentation tank via a pipeline to a sodium sulfide tank, an outlet of the sedimentation tank via a pipeline to a second filter, a liquid phase outlet of the second filter via a pipeline to a nanofiltration membrane device, and an outlet of the nanofiltration membrane device via a pipeline to a treated water tank. The first filter initially intercepts larger particulate impurities in the waste, significantly reducing the burden on subsequent treatment units and ensuring stable operation of the entire device. The liquid phase enters the settling tank, where gravity further settles and separates suspended substances, improving the purity of the liquid entering the distillation tank and optimizing the distillation effect. The distillation tank effectively separates volatile organic solvents and other substances from the waste material through distillation, based on the differences in boiling points of various components, achieving resource recovery and reducing the difficulty of treating organic matter in the subsequent degradation tank. The degradation tank decomposes the residual organic waste after distillation, reducing its environmental harm. The sedimentation tank, under the action of sodium sulfide, precipitates any potentially present heavy metal ions, significantly reducing the heavy metal content in the waste liquid. The second filter further removes tiny particles and unreacted substances generated during sedimentation, creating better influent conditions for the nanofiltration membrane device. The nanofiltration membrane device, with its precise filtration characteristics, efficiently retains impurities such as salts, small-molecule organic matter, and microorganisms in the waste liquid, ensuring that the water quality in the final treated water tank meets high standards, allowing for compliant discharge or partial reuse, reducing environmental pollution and conserving water resources. This method effectively removes harmful substances from isothiazolinone production waste, achieving harmless treatment of the waste and realizing resource recovery to a certain extent, resulting in good environmental and economic benefits.

[0015] The liquid phase of the first filter in this invention is connected to a centrifuge via a pipeline, and the liquid phase outlet of the centrifuge is connected to the settling tank via a pipeline. The centrifuge utilizes the centrifugal force generated by high-speed rotation to perform finer solid-liquid separation on the liquid phase processed by the first filter. Compared to the first filter, which relies solely on gravity settling, this method can further remove residual microscopic solid particles from the liquid phase, improve the purity of the liquid phase entering the settling tank, reduce the risk of equipment wear and reduced processing efficiency in subsequent processing units due to impurities (such as distillation and degradation), and ensure a smoother and more efficient subsequent processing flow.

[0016] The solid phase outlet of the first filter is connected to a first recovery tank, and the solid phase outlet of the centrifuge is connected to a second recovery tank. The outlets of the first and second recovery tanks are respectively connected to an acid leaching tank via pipelines. The inlet of the acid leaching tank is connected to a sulfuric acid solution tank via a pipeline, and the outlet of the acid leaching tank is connected to a plate and frame filter press via a pipeline. The liquid phase outlet of the plate and frame filter press is connected to a first heavy metal recovery tank via a pipeline. The solid phases generated by the filter and centrifuge are collected in the recovery tanks to provide raw materials for subsequent processing. Through acid leaching, any heavy metals that may be present in the solid phase react with sulfuric acid, dissolving into the liquid phase, which is then separated by the plate and frame filter press, ultimately achieving heavy metal recovery. This process not only reduces the potential environmental hazards of heavy metals in waste but also transforms the originally discarded solid phase into a usable resource, improving resource utilization and demonstrating significant environmental and economic benefits.

[0017] The outlets of the first and second recovery tanks are respectively connected to a crushing tank via pipelines, and the outlet of the crushing tank is connected to the acid leaching tank. The crushing tank crushes the solid phase from the recovery tank, effectively reducing the particle size. Smaller particles increase the contact area with the sulfuric acid solution during acid leaching, accelerating the acid leaching reaction rate, improving acid leaching efficiency, and allowing heavy metals to dissolve more fully into the liquid phase, thereby increasing the recovery amount and efficiency of heavy metals and further optimizing the solid waste treatment process.

[0018] The acid leaching tank is equipped with an online pH sensor, and the outlet pipe of the sulfuric acid solution tank is equipped with a shut-off valve. The online pH sensor and the shut-off valve are interlocked to the control system. The online pH sensor monitors the pH of the solution in the acid leaching tank in real time. When the pH value deviates from the optimal range for the acid leaching reaction, the sensor feeds a signal back to the control system. The control system automatically controls the shut-off valve on the outlet pipe of the sulfuric acid solution tank to adjust the amount of sulfuric acid solution added. This automated control method can precisely maintain the optimal pH conditions for the acid leaching reaction, ensuring that the acid leaching reaction proceeds efficiently and stably, and avoiding reduced reaction efficiency due to improper sulfuric acid addition or resource waste and environmental pollution caused by excessive acid addition.

[0019] The top outlet of the degradation tank is connected to a gas recovery tank via a pipeline. During the waste degradation process, methane is produced, which can be collected by the gas recovery tank and further recycled as energy, avoiding direct emission into the atmosphere, reducing environmental pollution, and ensuring a safe environment in the production workshop.

[0020] The solid phase outlet of the second filter is connected to a second heavy metal recovery tank via a pipeline. After treatment in the sedimentation tank, the solid phase of the second filter may still contain a certain amount of heavy metals. By setting up a second heavy metal recovery tank, this portion of the solid phase can be specifically collected, and the heavy metals can be further recovered, thereby improving the overall recovery rate of heavy metals, reducing the potential environmental hazards of heavy metal waste, and maximizing resource utilization.

[0021] The top gaseous outlet of the distillation tank is connected to an organic solvent recovery tank via a pipeline. Waste from isothiazolinone production often contains organic solvents such as toluene and xylene. During distillation, these organic solvents escape in gaseous form from the top of the distillation tank. The organic solvent recovery tank can collect and condense these gaseous organic solvents for recycling, reducing production costs and minimizing environmental pollution, thus meeting the dual requirements of environmental protection and resource conservation. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0024] The components include: 1. Waste tank; 2. First filter; 3. Settling tank; 4. Distillation tank; 5. Degradation tank; 6. Sedimentation tank; 7. Sodium sulfide tank; 8. Second filter; 9. Nanofiltration membrane device; 10. Treated water tank; 11. Centrifuge; 12. First recovery tank; 13. Second recovery tank; 14. Acid leaching tank; 15. Sulfuric acid solution tank; 16. Plate and frame filter press; 17. First heavy metal recovery tank; 18. Crushing tank; 19. Online pH sensor; 20. Shut-off valve; 21. Gas recovery tank; 22. Second heavy metal recovery tank; 23. Organic solvent recovery tank. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] like Figure 1As shown, an isothiazolinone production waste treatment device includes a waste tank 1. The outlet of the waste tank 1 is connected to a first filter 2 via a pipeline. The liquid phase outlet of the first filter 2 is connected to a settling tank 3 via a pipeline. The outlet of the settling tank 3 is connected to a distillation tank 4 via a pipeline. The bottom outlet of the distillation tank 4 is connected to a degradation tank 5 via a pipeline. The bottom of the degradation tank 5 is connected to a sedimentation tank 6 via a pipeline. The inlet of the sedimentation tank 6 is connected to a sodium sulfide tank 7 via a pipeline. The outlet of the sedimentation tank 6 is connected to a second filter 8 via a pipeline. The liquid phase outlet of the second filter 8 is connected to a nanofiltration membrane device 9 via a pipeline. The outlet of the nanofiltration membrane device 9 is connected to a treated water tank 10 via a pipeline. The first filter 2 initially intercepts larger particulate impurities in the waste, significantly reducing the burden on subsequent treatment units and ensuring stable operation of the entire device. Its liquid phase enters the settling tank 3, where gravity further settles and separates suspended substances, improving the purity of the liquid entering the distillation tank 4 and optimizing the distillation effect. Distillation tank 4 effectively separates volatile organic solvents and other substances from the waste material through distillation, based on the differences in boiling points of various components, thus achieving resource recovery and reducing the difficulty of treating organic matter in subsequent degradation tank 5. Degradation tank 5 decomposes the residual organic waste after distillation, reducing its environmental harm. Precipitation tank 6, under the action of sodium sulfide, precipitates any potentially present heavy metal ions, significantly reducing the heavy metal content in the waste liquid. Second filter 8 further filters, removing tiny particles and unreacted substances generated during precipitation, creating better influent conditions for nanofiltration membrane device 9. Nanofiltration membrane device 9, with its precise filtration characteristics, efficiently retains salts, small-molecule organic matter, and microorganisms in the waste liquid, ensuring that the water quality in final treated water tank 10 meets high standards, allowing for compliant discharge or partial reuse, reducing environmental pollution and conserving water resources. This process effectively removes harmful substances from isothiazolinone production waste, achieving harmless waste treatment and, to a certain extent, resource recovery, resulting in significant environmental and economic benefits.

[0027] The liquid phase from the first filter 2 is connected to a centrifuge 11 via a pipeline, and the liquid phase outlet of the centrifuge 11 is connected to the settling tank 3 via a pipeline. The centrifuge 11 utilizes the centrifugal force generated by its high-speed rotation to perform finer solid-liquid separation on the liquid phase processed by the first filter 2. Compared to the first filter 2, which relies solely on gravity settling, this method can further remove residual microscopic solid particles from the liquid phase, improving the purity of the liquid phase entering the settling tank 3. This reduces the risk of equipment wear and reduced processing efficiency in subsequent processing units such as distillation and degradation due to impurities, ensuring a smoother and more efficient subsequent processing flow.

[0028] The solid phase outlet of the first filter is connected to a first recovery tank 12, and the solid phase outlet of the centrifuge 11 is connected to a second recovery tank 13. The outlets of the first recovery tank 12 and the second recovery tank 13 are respectively connected to an acid leaching tank 14 via pipelines. The inlet of the acid leaching tank 14 is connected to a sulfuric acid solution tank 15 via a pipeline, and the outlet of the acid leaching tank 14 is connected to a plate and frame filter press 16 via a pipeline. The liquid phase outlet of the plate and frame filter press 16 is connected to a first heavy metal recovery tank 17 via a pipeline. The solid phases generated by the filter and centrifuge 11 are collected in the recovery tanks to provide raw materials for subsequent processing. Through acid leaching, heavy metals that may be contained in the solid phase can react with sulfuric acid, dissolve into the liquid phase, and then be separated by the plate and frame filter press 16, ultimately achieving the recovery of heavy metals. This process not only reduces the potential environmental hazards of heavy metals in waste but also transforms the originally discarded solid phase into a usable resource, improving resource utilization and demonstrating significant environmental and economic benefits.

[0029] The outlets of the first recovery tank 12 and the second recovery tank 13 are respectively connected to a crushing tank 18 via pipelines, and the outlet of the crushing tank 18 is connected to the acid leaching tank 14. The crushing tank 18 crushes the solid phase from the recovery tank, which can effectively reduce the particle size of the solid particles. Smaller particles can increase the contact area with sulfuric acid solution during acid leaching, accelerate the acid leaching reaction rate, improve acid leaching efficiency, and allow heavy metals to dissolve more fully into the liquid phase, thereby increasing the recovery amount and efficiency of heavy metals and further optimizing the solid waste treatment process.

[0030] The acid leaching tank 14 is equipped with an online pH sensor 19, and the outlet pipe of the sulfuric acid solution tank 15 is equipped with a shut-off valve 20. The online pH sensor 19 and the shut-off valve 20 are interlocked to the control system. The online pH sensor 19 monitors the pH of the solution in the acid leaching tank 14 in real time. When the pH value deviates from the optimal range for the acid leaching reaction, the sensor feeds a signal back to the control system. The control system automatically controls the shut-off valve 20 on the outlet pipe of the sulfuric acid solution tank 15 to adjust the amount of sulfuric acid solution added. This automated control method can accurately maintain the optimal pH conditions for the acid leaching reaction, ensuring that the acid leaching reaction proceeds efficiently and stably, and avoiding resource waste and environmental pollution caused by improper addition of sulfuric acid leading to reduced reaction efficiency or excessive acid addition.

[0031] The top outlet of the degradation tank 5 is connected to a gas recovery tank 21 via a pipeline. During the waste degradation process, methane is produced, which can be collected by the gas recovery tank 21 and further recycled as energy, avoiding direct emission into the atmosphere, reducing environmental pollution, and ensuring a safe environment in the production workshop.

[0032] The solid phase outlet of the second filter 8 is connected to a second heavy metal recovery tank 22 via a pipeline. After treatment by the sedimentation tank 6, the solid phase of the second filter 8 may still contain a certain amount of heavy metals. By setting up the second heavy metal recovery tank 22, this part of the solid phase can be collected specifically, and the heavy metals can be further recovered, thereby improving the overall recovery rate of heavy metals, reducing the potential harm of heavy metal waste to the environment, and maximizing the utilization of resources.

[0033] The top gas phase outlet of the distillation tank 4 is connected to the organic solvent recovery tank 23 via a pipeline. Isothiazolinone production waste often contains organic solvents such as toluene and xylene. During distillation, these organic solvents escape in gaseous form from the top of the distillation tank 4. The organic solvent recovery tank 23 can collect and condense these gaseous organic solvents for recovery, achieving the recycling of organic solvents, reducing production costs, and simultaneously reducing environmental pollution from organic solvent emissions, meeting the dual requirements of environmental protection and resource conservation.

[0034] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. An isothiazolinone production waste treatment apparatus comprising a waste tank, characterised in that: The outlet of the waste tank is connected to a first filter via a pipeline. The liquid phase outlet of the first filter is connected to a settling tank via a pipeline. The outlet of the settling tank is connected to a distillation tank via a pipeline. The bottom outlet of the distillation tank is connected to a degradation tank via a pipeline. The bottom of the degradation tank is connected to a sedimentation tank via a pipeline. The inlet of the sedimentation tank is connected to a sodium sulfide tank via a pipeline. The outlet of the sedimentation tank is connected to a second filter via a pipeline. The liquid phase outlet of the second filter is connected to a nanofiltration membrane device via a pipeline. The outlet of the nanofiltration membrane device is connected to a treated water tank via a pipeline.

2. An isothiazolone production waste treatment apparatus according to claim 1, characterized by: The liquid phase of the first filter is connected to a centrifuge via a pipeline, and the liquid phase outlet of the centrifuge is connected to the settling tank via a pipeline.

3. An isothiazolone production waste treatment apparatus according to claim 2, characterized by: The solid phase outlet of the first filter is connected to a first recovery tank, the solid phase outlet of the centrifuge is connected to a second recovery tank, the outlets of the first recovery tank and the second recovery tank are respectively connected to an acid leaching tank through pipelines, the inlet of the acid leaching tank is connected to a sulfuric acid solution tank through a pipeline, the outlet of the acid leaching tank is connected to a plate and frame filter press through a pipeline, and the liquid phase outlet of the plate and frame filter press is connected to a first heavy metal recovery tank through a pipeline.

4. The isothiazolinone production waste treatment device as described in claim 3, characterized in that: The outlets of the first and second recycling tanks are respectively connected to a crushing tank via pipelines, and the outlet of the crushing tank is connected to the acid leaching tank.

5. The isothiazolinone production waste treatment device as described in claim 3, characterized in that: The acid leaching tank is equipped with an online pH sensor, and the outlet pipe of the sulfuric acid solution tank is equipped with a shut-off valve. The online pH sensor and the shut-off valve are interlocked to the control system.

6. The isothiazolinone production waste treatment device as described in claim 1, characterized in that: The top outlet of the degradation tank is connected to a gas recovery tank via a pipeline.

7. The isothiazolinone production waste treatment device as described in claim 1, characterized in that: The solid phase outlet of the second filter is connected to a second heavy metal recovery tank via a pipeline.

8. The isothiazolinone production waste treatment device as described in claim 1, characterized in that: The top gas phase outlet of the distillation tank is connected to an organic solvent recovery tank via a pipeline.

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