Nylon waste recycling equipment

Abstract

The invention relates to nylon waste recycling equipment which comprises a pretreatment module, a separation treatment module, an intermediate material retreatment module and a nylon powder post-treatment module, according to the method, the ionic liquid is selected as a solvent, nylon and polyolefin in the nylon waste are effectively separated, and the drying agent is added into the ionic liquid, so that hydrolysis of the nylon in the high-temperature dissolution process is avoided to the greatest extent; finally, regenerated nylon powder is obtained; the ionic liquid and the drying agent can be recycled, so that the recycling cost is greatly reduced, and the method is green and environment-friendly; and the regenerated nylon powder is subjected to a post-treatment process to obtain raw materials diamine and dicarboxylic acid required by nylon production, and the raw materials are used for reproduction of nylon, so that the nylon waste recovery efficiency is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nylon recycling, and in particular relates to a nylon waste recycling device. Background Art

[0002] With the development of science and technology, nylon is widely used in our daily life, resulting in a large amount of post-consumer nylon waste. At present, post-consumer nylon is mainly disposed of by landfill and incineration, which is not only a waste of resources but also a damage to the environment. Since post-consumer nylon is relatively complex and contains a variety of impurities that are difficult to purify, the recovery rate is low, resulting in post-consumer nylon being unable to be reused in the textile industry, which is not conducive to recycling.

[0003] Ionic liquids are used as solvents. Since nylon has good solubility in ionic liquids, while ionic liquids cannot dissolve polyolefins, nylon and polyolefins can be effectively separated. Therefore, the use of ionic liquid treatment can effectively remove impurities in nylon, and finally obtain recycled nylon powder, realizing the initial recovery of nylon. However, nylon will undergo partial aging and degradation during long-term use, the molecular weight will become smaller, and the molecular weight distribution will become wider, so that the performance of the recycled nylon is greatly different from that of the new material. For some industrial products with high quality requirements, recycled nylon is difficult to meet the needs and cannot be used directly, so the recycled nylon needs to be reprocessed. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a nylon waste recycling device to solve the above problems.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods: nylon waste recycling and reuse equipment, including a pretreatment module, a separation treatment module, an intermediate material reprocessing module, and a nylon powder post-processing module. The nylon crusher of the pretreatment module is used to crush the recycled nylon waste. A nylon waste cleaning tank is arranged at the discharge port of the nylon crusher, a water inlet is arranged on the upper side of the nylon waste cleaning tank, the water inlet of the nylon waste cleaning tank is connected to a tap water pipe, a sewage outlet is arranged on the lower side of the nylon waste cleaning tank, and the sewage outlet of the nylon waste cleaning tank is connected to a first sedimentation tank through a pipeline, a discharge port is arranged on the lower side of the nylon waste cleaning tank, and a nylon waste drying box is arranged directly below the discharge port of the nylon waste cleaning tank.

[0006] An ion liquid storage tank, a desiccant storage tank, and a nitrogen storage tank are arranged beside the first mixer of the separation processing module. The discharge port of the ion liquid storage tank, the discharge port of the desiccant storage tank, and the discharge port of the nitrogen storage tank are all connected to the first mixer. The discharge port of the first mixer leads to a constant temperature box. The upper discharge port and the lower discharge port are respectively arranged on the upper and lower sides of the constant temperature box. The upper discharge port of the constant temperature box is connected to the second cleaning tank, which is convenient for passing the upper floating objects in the constant temperature box into the second cleaning tank. A deionized water storage tank is arranged beside the second cleaning tank. The deionized water storage tank is connected to the second cleaning tank for passing the deionized water into the second cleaning tank. Deionized water, a sewage outlet and a discharge outlet are arranged at the lower side of the second cleaning tank, wherein the discharge outlet of the second cleaning tank is connected with the second drying box, the lower discharge outlet of the constant temperature box is connected with the first filter box, the liquid discharge outlet of the first filter box is connected with the second sedimentation tank, the second sedimentation tank is connected with the deionized water storage tank through a pipeline, the deionized water storage tank is used to supply deionized water to the second sedimentation tank, and the second sedimentation tank is connected with the sewage outlet of the second cleaning tank through a pipeline, the solid discharge outlet of the second sedimentation tank leads to the third cleaning tank, the third cleaning tank is connected with the deionized water storage tank through a pipeline, and the discharge outlet of the third cleaning tank is connected with the third drying box through a pipeline.

[0007] The feed port of the second mixer of the nylon powder post-processing module is connected with the discharge port of the third drying box through a pipeline, a concentrated sulfuric acid storage tank is arranged beside the second mixer, and the concentrated sulfuric acid storage tank is connected with the second mixer through a pipeline, and the second mixer is connected with a tap water pipe at the same time, the discharge port of the second mixer is connected with the second filter box through a pipeline, and the solid discharge port of the second filter box is connected with the feed port of the third mixer, and the third mixer is provided with an activated carbon storage tank beside it, and the activated carbon storage tank is connected with the third mixer through a pipeline, and the discharge port of the third mixer is connected with the third filter box, and the third filter box is provided with two solid The third filter box has a solid discharge port, one of which is used for discharging activated carbon, and the other is used for discharging dicarboxylic acid. The liquid discharge port of the third filter box is connected to the third mixer through a pipeline, and the liquid discharge port of the second filter box is connected to the fourth mixer. A quicklime storage tank is arranged beside the fourth mixer, and the discharge port of the quicklime storage tank is connected to the fourth mixer. The fourth mixer is connected to a tap water pipe, and the discharge port of the fourth mixer leads to the feed port of the primary distillation tower, the liquid discharge port of the primary distillation tower is connected to the feed port of the secondary distillation tower, and the waste liquid discharge port of the secondary distillation tower is connected to the fourth mixer.

[0008] The intermediate material reprocessing module includes a fourth drying box and an intermediate material distillation tower. The fourth drying box is connected to the first filtering box and the first distillation tower for drying the desiccant. The intermediate material distillation tower is connected to the third cleaning tank for vacuum distillation to recover the ionic liquid.

[0009] The invention has the following beneficial effects: the invention uses ionic liquid as solvent, and since the ionic liquid has good solubility for nylon but cannot dissolve polyolefin, the nylon and polyolefin in the nylon waste are effectively separated, and the desiccant is added to the ionic liquid, which can effectively absorb the moisture released by the nylon during the dissolution process, and avoids the hydrolysis of the nylon during the high-temperature dissolution process to the greatest extent; finally, the regenerated nylon powder is obtained; the ionic liquid and the desiccant can be recycled, which greatly reduces the recycling cost and is green and environmentally friendly; on the one hand, the regenerated nylon powder can be directly used for industrial processing, and on the other hand, after separation treatment, impurities in the nylon waste are removed, and then the regenerated nylon powder is subjected to a post-treatment process to obtain the raw materials diamine and dicarboxylic acid required for nylon production, which are used for the reproduction of nylon, further improving the recovery efficiency of nylon waste, and in the process of post-treatment, the byproduct calcium sulfate generated by the post-treatment of the nylon powder can be used as the desiccant in the nylon separation treatment process, replenishing the loss amount in the desiccant recovery process, further reducing the cost of the desiccant, and the whole process flow is suitable for industrial continuous production; the byproduct dicarboxylic acid and calcium sulfate generated in the cement plant are used for cement production, avoiding the waste of byproducts. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the process flow chart of nylon waste recycling;

[0011] Figure 2 This is the overall structure diagram of the nylon waste recycling equipment;

[0012] Figure 3 This is the structure diagram of the preprocessing module;

[0013] Figure 4 It is the structural diagram of the separation processing module;

[0014] Figure 5 This is the structural diagram of the nylon powder post-processing module;

[0015] Figure 6 This is the structural diagram of the intermediate material reprocessing module.

[0016] Numbers in the figure: 1 nylon crusher; 2 first cleaning tank; 3 first sedimentation tank; 4 first drying box; 5 first mixer; 6 ionic liquid storage tank; 7 desiccant storage tank; 8 nitrogen storage tank; 9 constant temperature box; 10 second cleaning tank; 11 deionized water storage tank; 12 second drying box; 13 first filter box; 14 second sedimentation tank; 15 third cleaning tank; 16 third drying box; 17 second mixer; 18 concentrated sulfuric acid storage tank; 19 second filter box; 20 third mixer; 21 activated carbon storage tank; 22 third filter box; 23 fourth mixer; 24 quicklime storage tank; 25 primary distillation tower; 26 secondary distillation tower; 27 fourth drying box; 28 intermediate material distillation tower. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0018] like Figure 1-6 As shown, a nylon waste recycling and reuse equipment includes a pretreatment module, a separation treatment module, an intermediate material reprocessing module, and a nylon powder post-processing module. The nylon crusher 1 of the pretreatment module is used to crush the recycled nylon waste. A nylon waste cleaning tank 2 is arranged at the discharge port of the nylon crusher 1. A water inlet is arranged on the upper side of the nylon waste cleaning tank 2. The water inlet of the nylon waste cleaning tank 2 is connected with a tap water pipe. A sewage outlet is arranged on the lower side of the nylon waste cleaning tank 2. The sewage outlet of the nylon waste cleaning tank 2 is connected with a first sedimentation tank 3 through a pipeline. A discharge port is arranged on the lower side of the nylon waste cleaning tank 2. A nylon waste drying box 4 is arranged directly below the discharge port of the nylon waste cleaning tank 2.

[0019] In this embodiment, an ionic liquid storage tank 6, a desiccant storage tank 7, and a nitrogen storage tank 8 are arranged beside the first mixer 5 of the separation processing module. The discharge port of the ionic liquid storage tank 6, the discharge port of the desiccant storage tank 7, and the discharge port of the nitrogen storage tank 8 are all connected to the first mixer 5. The first mixer 5, the discharge port of the first mixer 5 leads to a constant temperature box 9, and the upper and lower sides of the constant temperature box 9 are respectively provided with an upper discharge port and a lower discharge port, wherein the upper discharge port of the constant temperature box 9 is connected to a second cleaning tank 10, so as to facilitate the upper floating objects in the constant temperature box 9 to be passed into the second cleaning tank 10, and a deionized water storage tank 11 is arranged beside the second cleaning tank 10, and the deionized water storage tank 11 is connected to the second cleaning tank 10, and is used to pass the deionized water into the second cleaning tank 10. Ionized water, a sewage outlet and a discharge outlet are provided at the lower side of the second cleaning tank 10, wherein the discharge outlet of the second cleaning tank 10 is connected to the second drying box 12, the lower discharge outlet of the constant temperature box 9 is connected to the first filter box 13, the liquid discharge outlet of the first filter box 13 is connected to the second sedimentation tank 14, the second sedimentation tank 14 is connected to the deionized water storage tank 11 through a pipeline, the deionized water storage tank 11 is used to supply deionized water to the second sedimentation tank 14, and the second sedimentation tank 14 is connected to the sewage outlet of the second cleaning tank 10 through a pipeline, the solid discharge outlet of the second sedimentation tank 14 leads to the third cleaning tank 15, the third cleaning tank 15 is connected to the deionized water storage tank 11 through a pipeline, and the discharge outlet of the third cleaning tank 15 is connected to the third drying box 16 through a pipeline.

[0020] In this embodiment, the feed port of the second mixer 17 of the nylon powder post-processing module is connected to the discharge port of the third drying box 16 through a pipeline, and a concentrated sulfuric acid storage tank 18 is arranged beside the second mixer 17, and the concentrated sulfuric acid storage tank 18 is connected to the second mixer 17 through a pipeline. At the same time, the second mixer 17 is connected to a tap water pipe, and the discharge port of the second mixer 17 is connected to the second filter box 19 through a pipeline, and the solid discharge port of the second filter box 19 is connected to the feed port of the third mixer 20, and the third mixer 20 is provided with an activated carbon storage tank 21 on the side, and the activated carbon storage tank 21 is connected to the third mixer 20 through a pipeline, and the discharge port of the third mixer 20 is connected to the third filter box 22, and the third filter box 22 Two solid discharge ports are provided, one of which is used for discharging activated carbon, and the other is used for discharging dicarboxylic acid. The liquid discharge port of the third filter box 22 is connected to the third mixer 17 through a pipeline, and the liquid discharge port of the second filter box 19 is connected to the fourth mixer 23. A quicklime storage tank 24 is provided next to the fourth mixer 23, and the discharge port of the quicklime storage tank 24 is connected to the fourth mixer 23. The fourth mixer 23 is connected to a tap water pipe, and the discharge port of the fourth mixer 23 leads to the feed port of the primary distillation tower 25. The liquid discharge port of the primary distillation tower 25 is connected to the feed port of the secondary distillation tower 26, and the waste liquid discharge port of the secondary distillation tower 26 is connected to the fourth mixer 23.

[0021] In this embodiment, the intermediate material reprocessing module includes a fourth drying box 27 and an intermediate material distillation tower 28. The fourth drying box 27 is connected to the first filter box 13 and the primary distillation tower 25 for drying the desiccant. The intermediate material distillation tower 28 is connected to the third cleaning tank 15 for vacuum distillation to recover the ionic liquid.

[0022] In this embodiment, the process of pre-treating nylon waste is as follows:

[0023] Step 1: The collected waste nylon is put into a nylon crusher 1 for crushing to obtain nylon crushed material with a crushing size of 1-2 cm;

[0024] Step 2: Put the nylon crushed material obtained in step 1 into the first cleaning tank 2, and wash the nylon crushed material by pumping tap water into the first cleaning tank 2 to remove stains in the nylon crushed material, and then discharge the washed stains into the first sedimentation tank 3. After sedimentation in the first sedimentation tank 3, the washing water at the upper layer is re-pumped into the first cleaning tank 2 for recycling to wash the nylon crushed material;

[0025] Step 3: putting the nylon crushed materials after cleaning in step 2 into the first drying box 4 for drying treatment to remove moisture from the nylon crushed materials, and obtaining dry and clean nylon crushed materials after drying treatment;

[0026] The wastewater generated during the pretreatment process is precipitated in the first sedimentation tank 3, and then the wastewater is recycled to achieve the recycling of washing water, thereby reducing the amount of wastewater generated, and after drying in the first drying box 4, dry and clean nylon crushed materials are obtained;

[0027] In this embodiment, the process of separating and treating nylon waste is as follows:

[0028] Step 1: Crushing pretreatment: the dried nylon crushed material obtained after the pretreatment is put into the first mixer 5, the ionic liquid 1-ethyl-3-methylimidazolium bromide is added to the first mixer 5 to completely submerge the nylon crushed material, and a desiccant is added to the first mixer 5 to form a mixed liquid;

[0029] Step 2: High temperature dissolution: The nitrogen in the nitrogen storage tank 8 is pumped into the mixer, and the nitrogen is used as a protective gas. Then, the mixed liquid in the first mixer 5 is heated to 180° C. and stirred and dissolved for 1.5 hours;

[0030] Step 3: the mixed liquid after stirring in step 2 is placed in a thermostat 9, and the temperature is lowered to 80°C for constant temperature storage during the standing process, ensuring that the temperature is always higher than the melting point of 1-ethyl-3-methylimidazolium bromide ionic liquid 71°C to avoid solidification of the ionic liquid and facilitate separation of nylon and the ionic liquid, and after 2 hours of standing and stratification, an upper floating material and a residual mixed liquid are obtained;

[0031] Step 4: taking out the upper floating material, placing it into the second cleaning tank 10, and washing the upper floating material with deionized water to remove the ionic liquid on the surface of the upper floating material, thereby obtaining a clean polyolefin product and cleaning wastewater;

[0032] Step 5: putting the cleaned polyolefin product into the second drying box 12 for drying to remove moisture, thereby obtaining regenerated polyolefin;

[0033] Step 6: Put the residual mixed liquid obtained in step 3 into the first filter box 13, filter out the desiccant, obtain a nylon solution, pass the nylon solution into the second sedimentation tank 14, and add deionized water, and at the same time, pass the cleaning wastewater in the second cleaning tank 10 into the second sedimentation tank 14, recycle the cleaning wastewater for washing the upper floating objects, precipitate the nylon, and filter out the precipitate to obtain the primary nylon powder;

[0034] Step 7: putting the primary nylon powder obtained in step 6 into a third cleaning tank 15, and washing with deionized water to remove the residual ionic liquid on the surface of the primary nylon powder;

[0035] Step 8: After step 7 is cleaned, the product is placed in a third drying box 16 for drying to remove moisture, thereby obtaining regenerated nylon powder;

[0036] After separation, recycled polyolefin and recycled nylon powder are obtained, and finally nylon waste is recycled;

[0037] In this embodiment, the process of post-processing nylon waste is as follows:

[0038] Step 1: Put the regenerated nylon powder obtained in the separation treatment step 8 into the second mixer 17, add concentrated sulfuric acid and tap water, heat the second mixer 17 to a temperature of 100° C., stir and react for 6.5 hours to obtain a mixed solution.

[0039] Step 2: The mixed solution obtained in step 1 is passed into the second filter box 19. After the mixed solution is cooled to 25° C., the dicarboxylic acid is precipitated from the mixed solution to achieve solid-liquid separation, thereby obtaining a dicarboxylic acid crude material and a residual mixed solution;

[0040] Step 3: Add the crude dicarboxylic acid obtained in step 2 into the third mixer 20, add tap water and industrial activated carbon into the third mixer 20, heat to 90° C., stir for 2.5 hours, and perform decolorization and purification;

[0041] Step 4: Pass the mixed solution after stirring in step 3 into the third filter box 22 to filter out the activated carbon;

[0042] Step 5, after the treatment in step 4, the mixed solution is cooled to 25°C to precipitate the dicarboxylic acid, and the remaining mixed solution is passed into the second mixer 17 for circulation treatment;

[0043] Step 6: The residual mixed liquid obtained in step 2 is introduced into the fourth mixer 23, and quicklime and tap water are added to neutralize the acidity in the residual mixed liquid, and the mixture is stirred and mixed uniformly;

[0044] Step 7: the mixed solution after stirring in step 6 is passed into a primary distillation tower 25, and distilled at a pressure of 2660 Pa and a temperature of 160° C., and the mixed solution is distilled to obtain a crude amine liquid by utilizing the characteristics that calcium sulfate is slightly soluble in water and dicarboxylic acid is soluble in water. At the same time, as the liquid decreases, calcium sulfate is first precipitated, and the calcium sulfate initially precipitated during the distillation is filtered out and dried as a desiccant in the separation process. As the crude amine liquid is continuously distilled out, calcium sulfate and dicarboxylic acid calcium are precipitated for cement production in a cement plant;

[0045] Step 8: The crude amine liquid is introduced into a secondary distillation tower 26, and distilled at a pressure of 1330 Pa and a temperature of 150° C. to obtain diamine; and the residual liquid in the secondary distillation tower 26 is introduced into the fourth mixer 23 described in step 6 for cyclic treatment;

[0046] In this embodiment, the process of reprocessing the nylon waste into intermediate materials is as follows:

[0047] Step 1: placing the desiccant obtained in the separation treatment step 6 in a fourth drying box 27, and drying at 220° C. for 1 hour to obtain a reusable desiccant;

[0048] Step 2: The mixed solution obtained by filtering and removing the primary nylon powder in the separation treatment step 7 is passed into the intermediate material distillation tower 28 for vacuum distillation to separate the ionic liquid and water to obtain a reusable ionic liquid.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A nylon waste recycling and reuse equipment, comprising a pre-treatment module, a separation treatment module, an intermediate material re-treatment module, and a nylon powder post-treatment module, characterized in that: The nylon crusher of the pretreatment module is used to crush the recycled nylon waste. A nylon waste cleaning tank is arranged at the discharge port of the nylon crusher. A water inlet is arranged on the upper side of the nylon waste cleaning tank. The water inlet of the nylon waste cleaning tank is connected to the tap water pipe. A sewage outlet is arranged on the lower side of the nylon waste cleaning tank. The sewage outlet of the nylon waste cleaning tank is connected to the first sedimentation tank through a pipeline. A discharge port is arranged on the lower side of the nylon waste cleaning tank. A nylon waste drying box is arranged directly below the discharge port of the nylon waste cleaning tank.

2. A nylon waste recycling equipment according to claim 1, characterized in that: An ion liquid storage tank, a desiccant storage tank, and a nitrogen storage tank are arranged beside the first mixer of the separation processing module. The discharge port of the ion liquid storage tank, the discharge port of the desiccant storage tank, and the discharge port of the nitrogen storage tank are all connected to the first mixer. The discharge port of the first mixer leads to a constant temperature box. The upper discharge port and the lower discharge port are respectively arranged on the upper and lower sides of the constant temperature box. The upper discharge port of the constant temperature box is connected to the second cleaning tank, which is convenient for passing the upper floating objects in the constant temperature box into the second cleaning tank. A deionized water storage tank is arranged beside the second cleaning tank. The deionized water storage tank is connected to the second cleaning tank for passing the deionized water into the second cleaning tank. Deionized water, a sewage outlet and a discharge outlet are arranged at the lower side of the second cleaning tank, wherein the discharge outlet of the second cleaning tank is connected with the second drying box, the lower discharge outlet of the constant temperature box is connected with the first filter box, the liquid discharge outlet of the first filter box is connected with the second sedimentation tank, the second sedimentation tank is connected with the deionized water storage tank through a pipeline, the deionized water storage tank is used to supply deionized water to the second sedimentation tank, and the second sedimentation tank is connected with the sewage outlet of the second cleaning tank through a pipeline, the solid discharge outlet of the second sedimentation tank leads to the third cleaning tank, the third cleaning tank is connected with the deionized water storage tank through a pipeline, and the discharge outlet of the third cleaning tank is connected with the third drying box through a pipeline.

3. The nylon waste recycling equipment according to claim 1, characterized in that: The feed port of the second mixer of the nylon powder post-processing module is connected with the discharge port of the third drying box through a pipeline, a concentrated sulfuric acid storage tank is arranged beside the second mixer, and the concentrated sulfuric acid storage tank is connected with the second mixer through a pipeline, and the second mixer is connected with a tap water pipe at the same time, the discharge port of the second mixer is connected with the second filter box through a pipeline, and the solid discharge port of the second filter box is connected with the feed port of the third mixer, and the third mixer is provided with an activated carbon storage tank beside it, and the activated carbon storage tank is connected with the third mixer through a pipeline, and the discharge port of the third mixer is connected with the third filter box, and the third filter box is provided with two solid The third filter box has a solid discharge port, one of which is used for discharging activated carbon, and the other is used for discharging dicarboxylic acid. The liquid discharge port of the third filter box is connected to the third mixer through a pipeline, and the liquid discharge port of the second filter box is connected to the fourth mixer. A quicklime storage tank is arranged beside the fourth mixer, and the discharge port of the quicklime storage tank is connected to the fourth mixer. The fourth mixer is connected to a tap water pipe, and the discharge port of the fourth mixer leads to the feed port of the primary distillation tower, the liquid discharge port of the primary distillation tower is connected to the feed port of the secondary distillation tower, and the waste liquid discharge port of the secondary distillation tower is connected to the fourth mixer.

4. The nylon waste recycling equipment according to claim 1, characterized in that: The intermediate material reprocessing module includes a fourth drying box and an intermediate material distillation tower. The fourth drying box is connected to the first filtering box and the first distillation tower for drying the desiccant. The intermediate material distillation tower is connected to the third cleaning tank for vacuum distillation to recover the ionic liquid.

5. A nylon waste recycling and reuse equipment according to claims 1-4, wherein the method for recycling nylon waste is: The process of pre-treatment of nylon waste is as follows: Step 1: Put the collected waste nylon into a nylon crusher for crushing to obtain nylon crushed materials with a crushing size of 1-2 cm; Step 2: Put the nylon crushed material obtained in step 1 into the first cleaning tank, and wash the nylon crushed material by pumping tap water into the first cleaning tank to remove stains in the nylon crushed material, and then discharge the washed stains into the first sedimentation tank. After sedimentation in the first sedimentation tank, the washing water at the upper layer is re-pumped into the first cleaning tank for recycling to wash the nylon crushed material; Step 3: putting the nylon crushed materials after washing in step 2 into a first drying box for drying to remove moisture from the nylon crushed materials, and obtaining dry and clean nylon crushed materials after drying; The wastewater generated in the pretreatment process is precipitated in the first sedimentation tank, and then the wastewater is recycled to achieve the recycling of washing water, thereby reducing the amount of wastewater generated, and after drying in the first drying box, dry and clean nylon crushed materials are obtained; The process of separating and processing nylon waste is as follows: Step 1: Crushing pretreatment: the dried nylon crushed material obtained after the pretreatment is put into the first mixer, the ionic liquid 1-ethyl-3-methylimidazolium bromide is added to the first mixer to completely submerge the nylon crushed material, and a desiccant is added to the first mixer to form a mixed liquid; Step 2: High temperature dissolution: Pump the nitrogen in the nitrogen storage tank into the mixer, use nitrogen as a protective gas, and then heat the mixed liquid in the first mixer to 180°C and stir and dissolve for 1.5 hours; Step 3: the mixed liquid after stirring in step 2 is placed in a constant temperature box, and the temperature is lowered to 80°C for constant temperature storage during the standing process, ensuring that the temperature is always higher than the melting point of 1-ethyl-3-methylimidazolium bromide ionic liquid 71°C to avoid solidification of the ionic liquid and facilitate separation of nylon and the ionic liquid. After 2 hours of standing and stratification, the upper floating material and the residual mixed liquid are obtained; Step 4: taking out the upper floating material, placing it in a second cleaning tank, and washing the upper floating material with deionized water to remove the ionic liquid on the surface of the upper floating material, thereby obtaining a cleaned polyolefin product and cleaning wastewater; Step 5: placing the cleaned polyolefin product into a second drying box for drying to remove moisture, thereby obtaining regenerated polyolefin; Step 6: Put the residual mixed liquid obtained in step 3 into the first filter box, filter out the desiccant, obtain a nylon solution, pass the nylon solution into the second sedimentation tank, and add deionized water, and at the same time, pass the cleaning wastewater in the second cleaning tank into the second sedimentation tank, recycle the cleaning wastewater for washing the upper floating objects, precipitate the nylon, and filter out the precipitate to obtain the primary nylon powder; Step 7: putting the primary nylon powder obtained in step 6 into a third cleaning tank, and washing with deionized water to remove the residual ionic liquid on the surface of the primary nylon powder; Step 8: After step 7 is cleaned, the product is placed in a third drying box for drying to remove moisture, thereby obtaining regenerated nylon powder; After separation, recycled polyolefin and recycled nylon powder are obtained, and finally nylon waste is recycled; The process of post-processing nylon waste is as follows: Step 1: Put the regenerated nylon powder obtained in the separation treatment step 8 into the second mixer, add concentrated sulfuric acid and tap water, heat the second mixer to a temperature of 100°C, stir and react for 6.5 hours to obtain a mixed solution. Step 2: Pass the mixed solution obtained in step 1 into a second filter box, and after the mixed solution is cooled to 25° C., dicarboxylic acid precipitates from the mixed solution, achieving solid-liquid separation, and obtaining dicarboxylic acid crude material and residual mixed solution; Step 3: Add the crude dicarboxylic acid obtained in step 2 into the third mixer, add tap water and industrial activated carbon into the third mixer, heat to 90° C., stir for 2.5 hours, and perform decolorization and purification; Step 4: Pass the mixed solution after stirring in step 3 into the third filter box to filter out the activated carbon; Step 5, after the treatment in step 4, the mixed solution is cooled to 25°C to precipitate the dicarboxylic acid, and the remaining mixed solution is passed into the second mixer for circulation treatment; Step 6: Pass the residual mixed solution obtained in step 2 into the fourth mixer, add quicklime and tap water to neutralize the acidity in the residual mixed solution, and mix well by stirring; Step 7: the mixed liquid after stirring in step 6 is passed into a primary distillation tower, and distilled under the conditions of 2660Pa pressure and 160°C temperature. The mixed liquid is distilled to obtain a crude amine liquid by utilizing the characteristics that calcium sulfate is slightly soluble in water and dicarboxylic acid is soluble in water. At the same time, as the liquid decreases, calcium sulfate is first precipitated. The calcium sulfate precipitated initially during the distillation is filtered out and dried as a desiccant in the separation process. As the crude amine liquid is continuously distilled out, calcium sulfate and dicarboxylic acid calcium are precipitated for cement production in cement plants. Step 8: The crude amine liquid is introduced into a secondary distillation tower, and distilled at a pressure of 1330 Pa and a temperature of 150° C. to obtain diamine; and the residual liquid in the secondary distillation tower is introduced into the fourth mixer described in step 6 for cyclic treatment; In this embodiment, the process of reprocessing the nylon waste into intermediate materials is as follows: Step 1: placing the desiccant obtained in the separation treatment step 6 in a fourth drying oven and drying it at 220° C. for 1 hour to obtain a reusable desiccant; Step 2: The mixed solution obtained after filtering out the primary nylon powder in step 7 is passed into an intermediate material distillation tower for vacuum distillation to separate the ionic liquid and water to obtain a reusable ionic liquid.

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