A device for purifying and recycling kraft pulp waste

Abstract

This utility model discloses a purification and recycling device for Kathon production waste, relating to the field of Kathon production technology. The waste tank is connected to a plate and frame filter press, which is connected to a first distillation tank. The first distillation tank is connected to a salting-out tank, the inlet of which is connected to an ethanol tank. The outlet of the salting-out tank is connected to a filter, the filter to a second distillation tank, the second distillation tank to an extraction tank, the inlet of which is connected to an ethyl acetate tank, the extraction tank to an organic phase storage tank, the organic phase storage tank to a third distillation tank, and the third distillation tank to a CIT / MIT byproduct recovery tank. All devices are closely connected, and materials flow orderly within the system, avoiding the cumbersome material transfer and losses of traditional processing methods. This significantly improves waste treatment efficiency, greatly increases resource recycling rate, is environmentally friendly, and reduces production costs.

Description

Technical Field

[0001] This utility model relates to the field of Kathon production technology, specifically to a device for purifying and reusing Kathon production waste. Background Technology

[0002] Kathon is a highly effective, broad-spectrum preservative. Its production process generates a large amount of complex waste, including CIT / MIT byproducts, sodium chloride, organic solvents, and unreacted intermediates. While CIT / MIT byproducts have economic value, organic solvents can be reused, and unreacted intermediates can potentially be recycled after processing, purifying and reusing Kathon production waste is of significant economic and environmental importance. However, due to the complex composition of the waste and the considerable differences in the physicochemical properties of its components, traditional separation and purification equipment is insufficient for effective separation and reuse. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a purification and reuse device for Kathon production waste, which has good separation effect, improves economic efficiency and reduces production costs, 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 purification and recycling device for Kathon production waste includes a waste tank. The outlet of the waste 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 distillation tank via a pipeline. The bottom outlet of the first distillation tank is connected to a salting-out tank via a pipeline. The inlet of the salting-out tank is connected to an ethanol tank via a pipeline. The outlet of the salting-out tank is connected to a filter via a pipeline. The liquid phase outlet of the filter is connected to a second distillation tank via a pipeline. The bottom outlet of the second distillation tank is connected to an extraction tank via a pipeline. The inlet of the extraction tank is connected to an ethyl acetate tank via a pipeline. The bottom outlet of the extraction tank is connected to an organic phase storage tank via a pipeline. The outlet of the organic phase storage tank is connected to a third distillation tank via a pipeline. The bottom outlet of the third distillation tank is connected to a CIT / MIT byproduct recovery tank via a pipeline.

[0006] As an improved technical solution, the liquid phase outlet of the plate and frame filter press is connected to a nanofiltration membrane device via a pipeline, and the clear liquid outlet of the nanofiltration membrane device is connected to the first distillation tank via a pipeline.

[0007] As an improved technical solution, the filtration accuracy of the plate and frame filter press is 5-10 micrometers, and the molecular weight cutoff of the nanofiltration membrane device is 1000-10000 Daltons.

[0008] As an improved technical solution, the top gas phase outlet of the first distillation tank is connected to a methanol recovery tank and a first ethyl acetate recovery tank via pipelines, and the outlet of the first ethyl acetate recovery tank is connected to the ethyl acetate tank via a pipeline.

[0009] As an improved technical solution, the solid phase outlet of the filter is connected to a washing tank, the inlet of the washing tank is connected to a purified water tank via a pipeline, the outlet of the washing tank is connected to a dryer via a pipeline, and the outlet of the dryer is connected to a sodium chloride recovery tank.

[0010] As an improved technical solution, the top gas phase outlet of the second distillation tank is connected to an ethanol recovery tank via a pipeline, and the bottom outlet of the ethanol recovery tank is connected to the ethanol tank via a pipeline.

[0011] As a preferred technical solution, the bottom outlet of the extraction tank is connected to an inorganic phase storage tank via a pipeline, the outlet of the inorganic phase storage tank is connected to an adsorption tank via a pipeline, and the outlet of the adsorption tank is connected to a wastewater storage tank via a pipeline.

[0012] As a preferred technical solution, the top gas phase outlet of the third distillation tank is connected to a second ethyl acetate recovery tank via a pipeline, and the outlet of the second ethyl acetate recovery tank is connected to the ethyl acetate 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 purification and reuse device for Kathon production waste, comprising a waste tank, the outlet of which is connected to a plate and frame filter press via a pipeline, the liquid phase outlet of which is connected to a first distillation tank via a pipeline, the bottom outlet of which is connected to a salting-out tank via a pipeline, the inlet of which is connected to an ethanol tank via a pipeline, the outlet of which is connected to a filter via a pipeline, the liquid phase outlet of which is connected to a second distillation tank via a pipeline, the bottom outlet of which is connected to an extraction tank via a pipeline, the inlet of which is connected to an ethyl acetate tank via a pipeline, the bottom outlet of which is connected to an organic phase storage tank via a pipeline, the outlet of which is connected to a third distillation tank via a pipeline, and the bottom outlet of which is connected to a CIT / MIT by-product recovery tank via a pipeline. Starting from the waste tank, solid impurities are initially removed by a plate and frame filter press. Then, through multiple key processes such as distillation, salting out, and extraction, the various components in the waste are gradually separated and recovered, ultimately achieving effective recovery of CIT / MIT byproducts. This ensures full utilization of various resources, reduces production costs, and minimizes economic losses caused by resource waste. The various units are closely interconnected, and materials flow orderly within the system, avoiding the cumbersome material transfer and losses of traditional methods. This significantly improves waste treatment efficiency, greatly enhances resource recycling rates, is environmentally friendly, and reduces production costs.

[0015] The liquid outlet of the plate and frame filter press of this invention is connected to a nanofiltration membrane device via a pipeline, and the clarified liquid outlet of the nanofiltration membrane device is connected to the first distillation tank via a pipeline. After the initial filtration by the plate and frame filter press, the nanofiltration membrane device can further retain small molecule impurities and some high-valence ions, reducing the impurity content in the liquid entering the first distillation tank, avoiding problems such as scaling and equipment corrosion caused by impurities during distillation, and improving the purity of the organic solvent obtained from subsequent distillation, thereby improving product quality.

[0016] The plate and frame filter press has a filtration precision of 5-10 micrometers, and the nanofiltration membrane device has a molecular weight cutoff of 1000-10000 Daltons. The 5-10 micrometer filtration precision of the plate and frame filter press and the 1000-10000 Dalton molecular weight cutoff of the nanofiltration membrane device form a graded filtration system. This system can efficiently remove larger particulate impurities while specifically retaining smaller molecule impurities, achieving precise separation of impurities of different particle sizes in waste materials. This reduces the load on subsequent processing steps and improves the overall processing efficiency and stability of the purification and reuse system.

[0017] The top gas phase outlet of the first distillation tank is connected to a methanol recovery tank and a first ethyl acetate recovery tank via pipelines. The outlet of the first ethyl acetate recovery tank is connected to the ethyl acetate tank via a pipeline. Connecting the gas phase generated in the first distillation tank to the methanol recovery tank and the first ethyl acetate recovery tank allows for efficient separation and recovery of methanol and ethyl acetate based on their different boiling points and volatility characteristics. The recovered ethyl acetate can also be transported to the ethyl acetate tank for unified storage and recycling, improving the recovery rate and utilization efficiency of organic solvents and reducing production costs.

[0018] The solid phase outlet of the filter is connected to a washing tank. The inlet of the washing tank is connected to a purified water tank via a pipeline. The outlet of the washing tank is connected to a dryer via a pipeline. The outlet of the dryer is connected to a sodium chloride recovery tank. The solid phase separated by the filter is washed with purified water in the washing tank to remove impurities adhering to the surface of sodium chloride crystals, thereby improving the purity of sodium chloride. The dryer further removes moisture, and finally, high-purity sodium chloride is recovered to the sodium chloride recovery tank, realizing the resource utilization of sodium chloride and avoiding secondary pollution caused by impurities being discharged with sodium chloride.

[0019] The top vapor outlet of the second distillation tank is connected to an ethanol recovery tank via a pipeline, and the bottom outlet of the ethanol recovery tank is connected to the ethanol tank via a pipeline. By introducing the cooled ethanol vapor from the second distillation tank into the ethanol recovery tank, and then transporting the recovered ethanol to the ethanol tank, efficient ethanol recovery and recycling are achieved. Ethanol is used as a salting-out agent in the salting-out step. This recovery process ensures a circular supply of ethanol, reduces ethanol consumption, lowers production costs, and minimizes the environmental impact of ethanol emissions.

[0020] The bottom outlet of the extraction tank is connected to an inorganic phase storage tank via a pipeline. The outlet of the inorganic phase storage tank is connected to an adsorption tank via a pipeline, and the outlet of the adsorption tank is connected to a wastewater storage tank via a pipeline. The inorganic phase discharged from the bottom of the extraction tank is first temporarily stored in the inorganic phase storage tank and then enters the adsorption tank. The adsorbent in the adsorption tank adsorbs and treats the small amount of residual organic matter and unreacted intermediates in the inorganic phase, effectively reducing the pollutant content in the wastewater, enabling the wastewater to meet the standards for subsequent treatment or discharge, reducing environmental pollution, and improving the integrity of resource recovery.

[0021] The top vapor outlet of the third distillation tank is connected to a second ethyl acetate recovery tank via a pipeline, and the outlet of the second ethyl acetate recovery tank is connected to the ethyl acetate tank via a pipeline. During the distillation of the extractant phase in the third distillation tank, the generated ethyl acetate vapor is condensed and enters the second ethyl acetate recovery tank. The recovered ethyl acetate is then transported to the ethyl acetate tank, achieving secondary recycling of ethyl acetate. This improves the recovery rate of ethyl acetate, reduces the cost of the extractant, and decreases ethyl acetate emissions, aligning with the concept of green and environmentally friendly production. 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. Plate and frame filter press; 3. First distillation tank; 4. Salting-out tank; 5. Ethanol tank; 6. Filter; 7. Second distillation tank; 8. Extraction tank; 9. Ethyl acetate tank; 10. Organic phase storage tank; 11. Third distillation tank; 12. CIT / MIT by-product recovery tank; 13. Nanofiltration membrane device; 14. Methanol recovery tank; 15. First ethyl acetate recovery tank; 16. Washing tank; 17. Purified water tank; 18. Dryer; 19. Sodium chloride recovery tank; 20. Ethanol recovery tank; 21. Inorganic phase storage tank; 22. Adsorption tank; 23. Wastewater storage tank; 24. Second ethyl acetate 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, a purification and recycling device for Kathon production waste includes a waste tank 1. The outlet of the waste tank 1 is connected to a plate and frame filter press 2 via a pipeline. The liquid phase outlet of the plate and frame filter press 2 is connected to a first distillation tank 3 via a pipeline. The bottom outlet of the first distillation tank 3 is connected to a salting-out tank 4 via a pipeline. The inlet of the salting-out tank 4 is connected to an ethanol tank 5 via a pipeline. The outlet of the salting-out tank 4 is connected to a filter 6 via a pipeline. The liquid phase outlet of the filter 6 is connected to a second distillation tank 7 via a pipeline. The bottom outlet of the second distillation tank 7 is connected to an extraction tank 8 via a pipeline. The inlet of the extraction tank 8 is connected to an ethyl acetate tank 9 via a pipeline. The bottom outlet of the extraction tank 8 is connected to an organic phase temporary storage tank 10 via a pipeline. The outlet of the organic phase temporary storage tank 10 is connected to a third distillation tank 11 via a pipeline. The bottom outlet of the third distillation tank 11 is connected to a CIT / MIT by-product recovery tank 12 via a pipeline. Starting from waste tank 1, solid impurities are initially removed by plate and frame filter press 2. Then, through multiple key processes such as distillation, salting out, and extraction, the various components in the waste are gradually separated and recovered, ultimately achieving effective recovery of CIT / MIT byproducts. This ensures full utilization of various resources, reduces production costs, and minimizes economic losses caused by resource waste. The various devices are closely interconnected, and materials flow orderly within the system, avoiding the cumbersome material transfer and losses of traditional processing methods. This significantly improves waste treatment efficiency, greatly enhances resource recycling rates, is environmentally friendly, and reduces production costs.

[0027] The liquid outlet of the plate and frame filter press 2 is connected to a nanofiltration membrane device 13 via a pipeline, and the clear liquid outlet of the nanofiltration membrane device 13 is connected to the first distillation tank 3 via a pipeline. After preliminary filtration by the plate and frame filter press 2, the nanofiltration membrane device 13 can further retain small molecule impurities and some high-valence ions, reducing the impurity content in the liquid entering the first distillation tank 3, avoiding problems such as scaling and equipment corrosion caused by impurities during the distillation process, and improving the purity of the organic solvent obtained from subsequent distillation, thereby improving product quality.

[0028] The plate and frame filter press 2 has a filtration accuracy of 5-10 micrometers, and the nanofiltration membrane device 13 has a molecular weight cutoff of 1000-10000 Daltons. The 5-10 micrometer filtration accuracy of the plate and frame filter press 2 and the 1000-10000 Dalton molecular weight cutoff of the nanofiltration membrane device 13 form a graded filtration system, which can efficiently remove larger particulate impurities and selectively retain small molecule impurities, achieving precise separation of impurities of different particle sizes in waste materials, reducing the load on subsequent processing steps, and improving the processing efficiency and stability of the entire purification and reuse system.

[0029] The top gas phase outlet of the first distillation tank 3 is connected to a methanol recovery tank 14 and a first ethyl acetate recovery tank 15 via pipelines. The outlet of the first ethyl acetate recovery tank 15 is connected to the ethyl acetate tank 9 via a pipeline. By connecting the gas phase generated by the first distillation tank 3 to the methanol recovery tank 14 and the first ethyl acetate recovery tank 15, efficient separation and recovery of methanol and ethyl acetate can be achieved based on their different boiling points and volatility characteristics. The recovered ethyl acetate can also be transported to the ethyl acetate tank 9 for unified storage and recycling, improving the recovery rate and utilization efficiency of organic solvents and reducing production costs.

[0030] The solid phase outlet of filter 6 is connected to a washing tank 16. The inlet of washing tank 16 is connected to a purified water tank 17 via a pipeline. The outlet of washing tank 16 is connected to a dryer 18 via a pipeline. The outlet of dryer 18 is connected to a sodium chloride recovery tank 19. The solid phase separated by filter 6 is washed with purified water in washing tank 16 to remove impurities adhering to the surface of sodium chloride crystals and improve the purity of sodium chloride. Dryer 18 further removes moisture, and finally, high-purity sodium chloride is recovered to sodium chloride recovery tank 19, realizing the resource utilization of sodium chloride and avoiding secondary pollution caused by impurities being discharged with sodium chloride.

[0031] The top vapor outlet of the second distillation tank 7 is connected to an ethanol recovery tank 20 via a pipeline, and the bottom outlet of the ethanol recovery tank 20 is connected to the ethanol tank 5 via a pipeline. By cooling the ethanol vapor generated in the second distillation tank 7 before introducing it into the ethanol recovery tank 20, and then transporting the recovered ethanol to the ethanol tank 5, efficient ethanol recovery and recycling are achieved. Ethanol is used as a salting-out agent in the salting-out step. This recovery process ensures a circular supply of ethanol, reduces ethanol consumption, lowers production costs, and minimizes the environmental impact of ethanol emissions.

[0032] The bottom outlet of the extraction tank 8 is connected to an inorganic phase storage tank 21 via a pipe. The outlet of the inorganic phase storage tank 21 is connected to an adsorption tank 22 via a pipe. The outlet of the adsorption tank 22 is connected to a wastewater storage tank 23 via a pipe. The inorganic phase discharged from the bottom of the extraction tank 8 is first temporarily stored in the inorganic phase storage tank 21 and then enters the adsorption tank 22. The adsorbent in the adsorption tank 22 adsorbs the small amount of residual organic matter and unreacted intermediates in the inorganic phase, effectively reducing the pollutant content in the wastewater, enabling the wastewater to meet the standards for subsequent treatment or discharge, reducing environmental pollution, and improving the integrity of resource recovery.

[0033] The top vapor outlet of the third distillation tank 11 is connected to a second ethyl acetate recovery tank 24 via a pipeline, and the outlet of the second ethyl acetate recovery tank 24 is connected to the ethyl acetate tank 9 via a pipeline. During the distillation of the extractant phase in the third distillation tank 11, the generated ethyl acetate vapor is condensed and enters the second ethyl acetate recovery tank 24. The recovered ethyl acetate is then transported to the ethyl acetate tank 9, achieving secondary recycling of ethyl acetate. This improves the recovery rate of ethyl acetate, reduces the cost of the extractant, and simultaneously reduces ethyl acetate emissions, aligning with the concept of green and environmentally friendly production.

[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. A device for purifying and recycling kraft production waste, comprising a waste tank, characterized in that: The outlet of the waste 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 distillation tank via a pipeline. The bottom outlet of the first distillation tank is connected to a salting-out tank via a pipeline. The inlet of the salting-out tank is connected to an ethanol tank via a pipeline. The outlet of the salting-out tank is connected to a filter via a pipeline. The liquid phase outlet of the filter is connected to a second distillation tank via a pipeline. The bottom outlet of the second distillation tank is connected to an extraction tank via a pipeline. The inlet of the extraction tank is connected to an ethyl acetate tank via a pipeline. The bottom outlet of the extraction tank is connected to an organic phase storage tank via a pipeline. The outlet of the organic phase storage tank is connected to a third distillation tank via a pipeline. The bottom outlet of the third distillation tank is connected to a CIT / MIT byproduct recovery tank via a pipeline.

2. A device for purifying and recycling kraft pulp production waste according to claim 1, characterized in that The filtration accuracy of the plate and frame filter press is 5-10 micrometers.

3. A device for purifying and recycling kraft pulp production waste according to claim 1, characterized in that: The top gas phase outlet of the first distillation tank is connected to a methanol recovery tank and a first ethyl acetate recovery tank via pipelines, and the outlet of the first ethyl acetate recovery tank is connected to the ethyl acetate tank via a pipeline.

4. The purification and reuse device for Kathon production waste as described in claim 1, characterized in that: The solid phase outlet of the filter is connected to a washing tank, the inlet of the washing tank is connected to a purified water tank via a pipeline, the outlet of the washing tank is connected to a dryer via a pipeline, and the outlet of the dryer is connected to a sodium chloride recovery tank.

5. A device for purifying and recycling kraft pulp production waste according to claim 1, characterized in that: The top gas phase outlet of the second distillation tank is connected to an ethanol recovery tank via a pipeline, and the bottom outlet of the ethanol recovery tank is connected to the ethanol tank via a pipeline.

6. A device for purifying and recycling kraft pulp production waste according to claim 1, characterized in that: The bottom outlet of the extraction tank is connected to an inorganic phase storage tank via a pipe. The outlet of the inorganic phase storage tank is connected to an adsorption tank via a pipe. The outlet of the adsorption tank is connected to a wastewater storage tank via a pipe.

7. A device for purifying and recycling kraft pulp waste according to claim 1, characterized in that: The top gas phase outlet of the third distillation tank is connected to a second ethyl acetate recovery tank via a pipeline, and the outlet of the second ethyl acetate recovery tank is connected to the ethyl acetate tank via a pipeline.

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