A three-waste treatment device and process for producing N-phenylmaleimide

Abstract

The application relates to the technical field of three-waste treatment, and discloses a three-waste treatment device and process for N-phenyl maleimide production, which comprises a bottom plate, a carbonization furnace is fixedly installed on the upper side of the bottom plate, a stirring mechanism is fixedly installed on the upper side of the bottom plate and at one side of the carbonization furnace, a spray tower group is fixedly connected to the upper side of the bottom plate and at the other side of the carbonization furnace, a burning mechanism is fixedly connected to the upper side of the bottom plate and at one side of the stirring mechanism, the top of the burning mechanism is in communication with a waste heat boiler, the other end of the waste heat boiler is in communication with an evaporator, and the evaporator is in communication with the spray tower group. Solid waste residues are converted into high-efficiency adsorbents for purifying waste gas, waste water is evaporated and concentrated, and then is burned together with the waste residues saturated with adsorption, so that a closed loop of "treating waste with waste" is formed, and the three pollution sources of solid waste, waste gas and waste water in the production process are collaboratively treated and converted in the system.

Description

Technical Field

[0001] This invention relates to the field of waste treatment technology, specifically to a waste treatment device and process for the production of N-phenylmaleimide. Background Technology

[0002] N-Phenylanimide is an important chemical intermediate widely used in polymer materials, pharmaceuticals, pesticides, and other fields. Its production process generates large amounts of waste gas, wastewater, and solid waste. These "three wastes" are complex in composition and highly toxic; improper handling can easily lead to environmental pollution and resource waste.

[0003] Traditional methods for treating waste gas, wastewater, and solid waste typically involve separate disposal: waste gas is treated by spraying or adsorption, wastewater is concentrated through biochemical processes or evaporation, and waste residue is incinerated or landfilled. These methods suffer from low treatment efficiency, high operating costs, and a tendency to generate secondary pollution. In particular, they lack the capacity for co-processing waste residue and waste gas, failing to achieve resource utilization of waste. Therefore, there is an urgent need for a waste gas, wastewater, and solid waste treatment device and process that can integrate treatment and achieve energy and material recycling to improve treatment efficiency, reduce energy consumption, and meet green production requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a waste treatment device and process for the production of N-phenylmaleimide, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a waste treatment device for the production of N-phenylmaleimide, comprising a base plate, on the upper side of which a carbonization furnace, a stirring mechanism, a spray tower group, and an incineration mechanism are fixedly installed; the top of the incineration mechanism is connected to a waste heat boiler; the other end of the waste heat boiler is connected to an evaporator; and the evaporator is connected to the spray tower group. The stirring mechanism includes a stirring component, a feeding port, and a liquid injection pipe. The stirring component is fixedly installed on the upper side of the base plate, and the feeding port and liquid injection pipe are provided on the upper side of the stirring component. The spray tower assembly includes a spray tower, a liquid tank, and a spray assembly. The spray tower is fixedly connected to the upper side of the base plate, the liquid tank is installed at the bottom of the spray tower, and the spray assembly is provided on the inner side of the spray tower. The waste residue is carbonized in the carbonization furnace, modified by the stirring mechanism to form an adsorbent bed, and sent into the spray tower to adsorb waste gas. The evaporator evaporates the wastewater, producing a high-concentration concentrate, which, along with the adsorbed saturated waste residue, is fed into the incineration mechanism for combustion. The resulting high-temperature flue gas is fed into the waste heat boiler, which generates steam to supply the evaporator. The condensate produced by the evaporator is then supplied to the liquid tank.

[0006] Furthermore, the stirring component includes a tank, a discharge pipe, a motor, and a stirring shaft. The tank is fixedly connected to the upper side of the base plate, and the motor is fixedly connected to the outer side of the tank. The output end of the motor is fixedly connected to the stirring shaft, and the other end of the stirring shaft is rotatably connected to the inner wall of the tank. The upper side of the tank is connected to the feeding port and the liquid injection pipe, and the side of the tank away from the motor is connected to the discharge pipe.

[0007] The carbonized material enters the tank of the mixing mechanism through the feeding port, while a modifying agent (dilute phosphoric acid or zinc chloride solution) is added through the injection pipe, and the mixture is soaked in a certain proportion. A motor drives the stirring shaft to rotate, ensuring thorough mixing of the material and the agent, completing the modification treatment. This process significantly increases its specific surface area and adsorption activity, forming a highly efficient adsorbent. The modified adsorbent is discharged through the discharge pipe and then dried by an external dryer for subsequent waste gas adsorption. Furthermore, the spray tower includes a tower body, an air inlet pipe, a feed port, a connecting pipe, baffles, and a demister. The tower body is fixedly connected to the upper side of the base plate, and the air inlet pipe is connected to the lower side of the tower body. Evenly distributed baffles are installed on the inner side of the tower body, and two sets of feed ports are installed on the outer side of the tower body. The two sets of feed ports correspond to the two sets of upper baffles, and the air inlet pipe corresponds to the lower baffles. A demister is installed on the upper inner side of the tower body, and the bottom of the tower body is connected to a liquid tank. A connecting pipe is connected to the outer side of the liquid tank.

[0008] The waste gas generated during the production of N-phenylmaleimide enters the spray tower group through the inlet pipe. The tower is equipped with multiple layers of baffles with a mesh design to support the adsorbent bed. The waste residue, which has been carbonized and modified to form a high-efficiency adsorbent, is added into the baffles through the feed port and the inlet pipe to form an adsorption bed. As the waste gas rises, it comes into contact with the adsorbent, and the pollutants are adsorbed and purified. Furthermore, the spray assembly includes a circulating pump, a central pipe, side pipes, nozzles, and a liquid supply pipe. The circulating pump is fixedly connected to the upper side of the base plate. The inlet end of the circulating pump is connected to the liquid tank, and the outlet end of the circulating pump is connected to the liquid supply pipe. Two sets of central pipes are connected to the liquid supply pipe. The two sets of central pipes correspond to the two sets of partitions on the upper side. The central pipes are connected to evenly distributed side pipes. The lower sides of the central pipes and side pipes are connected to evenly distributed nozzles.

[0009] The spray system is driven by spray components: the spray liquid in the tank is lifted by a circulating pump and delivered to the central pipe and side branch pipes through the supply pipe, and finally sprayed evenly by the nozzles to enhance the adsorption and washing effect. The spray liquid is returned to the tank for reuse. The purified gas is discharged after the mist droplets are removed by the demister at the top. Furthermore, the incineration mechanism includes support legs, furnace body, support plate, inlet pipe, and feeding assembly. Support legs are fixedly connected to the upper side of the base plate, and furnace body is fixedly connected to the upper side of the support legs. Inlet pipe and feeding assembly are connected to the outer side of the furnace body, and inlet pipe and feeding assembly are tangentially inserted into the interior of the furnace body.

[0010] Furthermore, the feeding assembly includes a second motor, an auger, a transport trough, and an inlet trough. The outer side of the furnace body is connected to the inlet trough, and the upper side of the inlet trough is connected to the transport trough. The outer side of the transport trough is fixedly connected to the second motor, and the output end of the second motor is fixedly connected to the auger. The other end of the auger is rotatably connected to the inner wall of the transport trough.

[0011] Furthermore, the waste heat boiler includes a mounting frame, a heat exchanger body, a partition plate, a capillary tube assembly, a guide partition plate, a water pipe, a steam chamber, a water supply pipe, a steam outlet, and a flue gas pipe. The mounting frame is fixedly connected to the upper side of the base plate, and the heat exchanger body is fixedly connected to the inner side of the mounting frame. Two sets of partition plates are fixedly connected to the inner side of the heat exchanger body, and a capillary tube assembly is installed between the two sets of partition plates. Evenly distributed guide partition plates are installed on the outer side of the capillary tube assembly. Evenly distributed water pipes are connected to the upper side of the heat exchanger body, and a steam chamber is connected to the upper side of the water pipes. A water supply pipe and a steam outlet are connected to the upper side of the steam chamber. A flue gas pipe connects one end of the heat exchanger body to the top of the furnace body.

[0012] The concentrated wastewater is introduced into the incineration unit through an external pipeline. The saturated waste residue and high-concentration wastewater enter the incineration unit through the feeding assembly: the motor drives the auger to transport the materials to the furnace body through the transport trough and the inlet trough.

[0013] Simultaneously, combustion air enters the furnace tangentially through the inlet pipe, promoting combustion disturbance. The high-temperature flue gas generated from combustion enters the heat exchanger of the waste heat boiler through the flue gas pipe, flows through capillary tube group one, and soft water is added to the steam chamber through the upper water inlet pipe. The soft water in the steam chamber is transported to the outer area of ​​capillary tube group one through the heating water pipe, and guided by guide baffle one to fully contact the capillary tube group one, generating steam. The steam is collected in the steam chamber and supplied to the evaporator through the steam outlet. After the heat of the flue gas is utilized, it is cooled and passed through a pipe into the air inlet pipe for purification before being discharged.

[0014] Furthermore, the evaporator includes a second mounting bracket, an evaporator body, a second partition plate, a second guide partition plate, and a second capillary tube assembly. The second mounting bracket is fixedly connected to the upper side of the base plate. The evaporator body is fixedly connected to the inner side of the second mounting bracket. Two sets of second partition plates are fixedly connected to the inner side of the evaporator body. A second capillary tube assembly is fixedly connected between the two sets of second partition plates. Evenly distributed second guide partition plates are installed between the second capillary tube assembly and the inner wall of the evaporator body. The upper outer side of the evaporator body is connected to the steam outlet through a pipe, and the lower outer side of the evaporator body is connected to the connecting pipe through a pipe.

[0015] Wastewater generated during the N-phenylmaleimide production process enters the evaporator body, which is equipped with inlet and outlet ports. Wastewater enters through the inlet and is fed into a second set of capillary tubes. Steam generated by the waste heat boiler is introduced into the outer area of ​​the second set of capillary tubes through the steam outlet. After passing through a second guide baffle, the steam comes into efficient contact with the second set of capillary tubes, forming a highly efficient heat exchange structure that acts as a heat source for the evaporation and concentration of the wastewater. The condensed steam then flows back to the liquid tank via a pipeline as makeup water for the spray system. A waste treatment process for the production of N-phenylmaleimide includes the following steps: S1. Waste residue pretreatment: The solid waste residue generated during the production of N-phenylmaleimide is put into a carbonization furnace for carbonization and converted into activated carbon matrix; the carbonized material is mixed with the modified agent in a stirring mechanism in a certain proportion for soaking and modification to produce a high-efficiency adsorbent. S2, Waste gas adsorption and purification: The high-efficiency adsorbent prepared in S1 is filled into the adsorption bed of the spray tower group; the waste gas generated during the production of N-phenylmaleimide is introduced into the spray tower group so that the waste gas comes into contact with the adsorbent for adsorption and purification; at the same time, the spray components are started for auxiliary washing; the purified gas is discharged after demisting. S3. Wastewater evaporation concentration and co-incineration: Wastewater generated during the production of N-phenylmaleimide is passed into an evaporator for evaporation concentration to obtain a high-concentration concentrate; the waste residue saturated by adsorption in S2 is mixed with the high-concentration concentrate and then sent to an incineration unit for incineration. S4. Energy recycling: The high-temperature flue gas generated by combustion in S3 is passed into the waste heat boiler to heat the soft water therein to generate steam; the steam is used as the heat source for the evaporation of wastewater in S3, and the steam is recovered after condensation as the spray water for the spray tower group; the cooled flue gas discharged from the waste heat boiler is passed into the spray tower group in S2 for purification before being discharged.

[0016] Furthermore, the modified agent is a dilute phosphoric acid solution or a zinc chloride solution.

[0017] Compared with the prior art, the present invention provides a waste treatment device and process for the production of N-phenylmaleimide, which has the following beneficial effects: 1. This invention transforms solid waste residue into a highly efficient adsorbent for purifying waste gas, and then incinerates the concentrated wastewater together with the saturated waste residue, forming a closed loop of "treating waste with waste." This not only synergistically absorbs and transforms the three major pollution sources—solid waste, waste gas, and wastewater—within the system, significantly reducing the amount of pollutants that ultimately need to be discharged externally or disposed of by third parties, but also fully utilizes the material properties and energy value of the waste itself, thereby effectively reducing the high transportation, landfill, and third-party disposal costs associated with traditional separate treatment methods.

[0018] 2. This invention recovers the heat energy of high-temperature flue gas during the incineration process, generates steam in a waste heat boiler, and supplies this steam as a heat source to the wastewater evaporation process, achieving efficient cascade utilization of waste heat and reducing dependence on external energy sources such as fresh steam. Simultaneously, the condensate from the evaporation process is recycled as makeup water for the spray tower, reducing the consumption of fresh industrial water. Furthermore, the cooled flue gas after incineration is returned to the front end of the waste gas treatment process for purification, further recovering waste heat and ensuring that the exhaust gas meets emission standards. The entire process forms a closed-loop cycle of "heat energy-steam-condensate," greatly improving the efficiency of energy and water resource utilization and reducing energy consumption during production operations. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention from another angle; Figure 3 This is a schematic diagram of the internal three-dimensional structure of the stirring mechanism of the present invention after being cut apart; Figure 4 This is a cross-sectional three-dimensional structural diagram of the spray tower assembly of the present invention; Figure 5 This is a three-dimensional structural diagram of the spray assembly of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the internal three-dimensional structure of the incineration mechanism of the present invention after being cut open; Figure 8 This is a schematic diagram of the internal three-dimensional structure of the feeding component of the present invention after being cut open; Figure 9 This is a schematic diagram of the internal three-dimensional structure of the waste heat boiler of the present invention after it has been cut open; Figure 10 For the present invention Figure 9 Enlarged view of point B in the middle; Figure 11 This is a schematic diagram of the internal three-dimensional structure of the evaporator of the present invention after being cut open; Figure 12 For the present invention Figure 11 Enlarged diagram of point C in the middle.

[0020] In the diagram: 1. Base plate; 2. Carbonization furnace; 3. Stirring mechanism; 31. Tank; 32. Feed port; 33. Liquid injection pipe; 34. Discharge pipe; 35. Motor 1; 36. Stirring shaft; 4. Spray tower assembly; 41. Tower body; 42. Air inlet pipe; 43. Feed port; 44. Liquid tank; 45. Connecting pipe; 46. Baffle plate; 47. Demister; 48. Spray assembly; 481. Circulating pump; 482. Central pipe; 483. Side branch pipe; 484. Nozzle; 485. Liquid supply pipe; 5. Incineration mechanism; 51. Support legs; 52. Furnace body; 53. 551. Support plate; 552. Inlet pipe; 553. Feeding assembly; 554. Motor II; 5555. Screw conveyor; 5556. Transport trough; 5557. Inlet trough; 6. Waste heat boiler; 61. Mounting frame I; 62. Heat exchanger body; 63. Partition plate I; 64. Capillary tube assembly I; 65. Guide partition plate I; 66. Water pipe; 67. Steam chamber; 68. Water supply pipe; 69. Steam outlet; 610. Flue gas pipe; 7. Evaporator; 71. Mounting frame II; 72. Evaporator body; 73. Partition plate II; 74. Guide partition plate II; 75. Capillary tube assembly II. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example

[0023] Please see Figures 1-12 A waste treatment device for the production of N-phenylmaleimide includes a base plate 1. A carbonization furnace 2, a stirring mechanism 3, a spray tower group 4, and an incineration mechanism 5 are fixedly installed on the upper side of the base plate 1. The top of the incineration mechanism 5 is connected to a waste heat boiler 6, and the other end of the waste heat boiler 6 is connected to an evaporator 7. The evaporator 7 is connected to the spray tower group 4. The mixing mechanism 3 includes a mixing component, a feeding port 32, and a liquid injection pipe 33. The mixing component is fixedly installed on the upper side of the base plate 1, and the feeding port 32 and the liquid injection pipe 33 are provided on the upper side of the mixing component. The spray tower group 4 includes a spray tower, a liquid tank 44, and a spray assembly 48. The spray tower is fixedly connected to the upper side of the base plate 1, the liquid tank 44 is installed at the bottom of the spray tower, and the spray assembly 48 is installed inside the spray tower. The waste residue is carbonized in the carbonization furnace 2, modified by the stirring mechanism 3 to serve as an adsorbent bed, and sent into the spray tower to adsorb the waste gas. The wastewater is evaporated in the evaporator 7, and the high-concentration concentrate and the adsorbed saturated waste residue are fed into the incineration mechanism 5 for incineration. The generated high-temperature flue gas is fed into the waste heat boiler 6, which generates steam to supply the evaporator 7. The condensate generated by the evaporator 7 is supplied to the liquid tank 44.

[0024] Furthermore, the mixing components include a tank 31, a discharge pipe 34, a motor 35, and a mixing shaft 36. The tank 31 is fixedly connected to the upper side of the bottom plate 1, the motor 35 is fixedly connected to the outer side of the tank 31, the output end of the motor 35 is fixedly connected to the mixing shaft 36, and the other end of the mixing shaft 36 is rotatably connected to the inner wall of the tank 31. The upper side of the tank 31 is connected to the feeding port 32 and the liquid injection pipe 33, and the side of the tank 31 away from the motor 35 is connected to the discharge pipe 34.

[0025] The carbonized material enters the tank 31 of the stirring mechanism 3 through the feeding port 32, while a modifying agent (dilute phosphoric acid or zinc chloride solution) is added through the injection pipe 33, and the mixture is soaked in a certain proportion. Motor 35 drives the stirring shaft 36 to rotate, ensuring thorough mixing of the material and the agent, completing the modification treatment. This process significantly increases its specific surface area and adsorption activity, forming a highly efficient adsorbent. The modified adsorbent is discharged through the discharge pipe 34 and then dried by an external dryer for subsequent waste gas adsorption. Furthermore, the spray tower includes a tower body 41, an air inlet pipe 42, a feed port 43, a connecting pipe 45, a baffle plate 46, and a demister 47. The tower body 41 is fixedly connected to the upper side of the bottom plate 1. The air inlet pipe 42 is connected to the lower side of the tower body 41. The baffle plate 46 is evenly distributed on the inner side of the tower body 41. Two sets of feed ports 43 are installed on the outer side of the tower body 41. The two sets of feed ports 43 correspond to the two sets of baffle plates 46 on the upper side. The air inlet pipe 42 corresponds to the baffle plate 46 on the lower side. The demister 47 is installed on the upper inner side of the tower body 41. The bottom of the tower body 41 is connected to the liquid tank 44. The connecting pipe 45 is connected to the outer side of the liquid tank 44.

[0026] The waste gas generated during the production of N-phenylmaleimide enters the tower body 41 of the spray tower group 4 through the air inlet pipe 42. The tower is equipped with multiple layers of baffles 46, which are mesh-like and used to support the adsorbent bed. The waste residue that has been carbonized and modified to form a high-efficiency adsorbent is added into the baffles 46 through the feed port 43 and the air inlet pipe 42 to form an adsorption bed. The waste gas comes into contact with the adsorbent during the upward process, and the pollutants are adsorbed and purified. Furthermore, the spray assembly 48 includes a circulation pump 481, a central pipe 482, a side branch pipe 483, a nozzle 484, and a liquid supply pipe 485. The circulation pump 481 is fixedly connected to the upper side of the base plate 1. The water inlet of the circulation pump 481 is connected to the liquid tank 44, and the water outlet of the circulation pump 481 is connected to the liquid supply pipe 485. Two sets of central pipes 482 are connected to the liquid supply pipe 485. The two sets of central pipes 482 correspond to the two sets of partitions 46 on the upper side. The central pipes 482 are connected to the evenly distributed side branch pipes 483. The lower sides of the central pipes 482 and the side branch pipes 483 are connected to evenly distributed nozzles 484.

[0027] The spray system is driven by spray assembly 48: the spray liquid in the liquid tank 44 is lifted by the circulation pump 481, and delivered to the central pipe 482 and the side branch pipe 483 through the liquid supply pipe 485, and finally sprayed evenly by the nozzles 484 to enhance the adsorption and washing effect. The spray liquid is returned to the liquid tank for recycling. The purified gas is discharged after the top demister 47 removes the mist droplets. Furthermore, the incineration mechanism 5 includes a support leg 51, a furnace body 52, a support plate 53, an inlet pipe 54, and a feeding assembly 55. The support leg 51 is fixedly connected to the upper side of the base plate 1, and the furnace body 52 is fixedly connected to the upper side of the support leg 51. The inlet pipe 54 and the feeding assembly 55 are connected to the outer side of the furnace body 52, and the inlet pipe 54 and the feeding assembly 55 are tangentially inserted into the interior of the furnace body 52.

[0028] Furthermore, the feeding assembly 55 includes a second motor 551, an auger 552, a transport trough 553, and an inlet trough 554. The outer side of the furnace body 52 is connected to the inlet trough 554, and the upper side of the inlet trough 554 is connected to the transport trough 553. The second motor 551 is fixedly connected to the outer side of the transport trough 553. The output end of the second motor 551 is fixedly connected to the auger 552, and the other end of the auger 552 is rotatably connected to the inner wall of the transport trough 553.

[0029] Furthermore, the waste heat boiler 6 includes a mounting frame 61, a heat exchanger body 62, a partition plate 63, a capillary tube assembly 64, a guide partition plate 65, a water pipe 66, a steam chamber 67, a water supply pipe 68, a steam outlet 69, and a flue gas pipe 610. The mounting frame 61 is fixedly connected to the upper side of the base plate 1. The heat exchanger body 62 is fixedly connected to the inner side of the mounting frame 61. Two sets of partition plates 63 are fixedly connected to the inner side of the heat exchanger body 62. A capillary tube assembly 64 is installed between the two sets of partition plates 63. A uniformly distributed guide partition plate 65 is installed on the outer side of the capillary tube assembly 64. A uniformly distributed water pipe 66 is connected to the upper side of the heat exchanger body 62. A steam chamber 67 is connected to the upper side of the water pipe 66. A water supply pipe 68 and a steam outlet 69 are connected to the upper side of the steam chamber 67. A flue gas pipe 610 is connected between one end of the heat exchanger body 62 and the top of the furnace body 52.

[0030] The concentrated high-concentration wastewater is introduced into the incineration unit 5 through an external pipeline. The adsorbed saturated waste residue and high-concentration wastewater enter the incineration unit 5 through the feeding assembly 55: the motor 2 551 drives the auger 552 to transport the material to the furnace body 52 through the transport trough 553 and the inlet trough 554.

[0031] Simultaneously, combustion air enters the furnace body 52 tangentially through the inlet pipe 54, promoting combustion disturbance. The high-temperature flue gas generated from combustion enters the heat exchange furnace body 62 of the waste heat boiler 6 through the flue gas pipe 610, flows through the capillary tube group 64, and soft water is added to the steam chamber 67 through the upper water inlet pipe 68. The soft water in the steam chamber 67 is transported to the outer area of ​​the capillary tube group 64 through the heating water pipe 66, and guided by the guide baffle 65 to fully contact the capillary tube group 64, generating steam. The steam is collected in the steam chamber 67 and supplied to the evaporator 7 through the steam outlet 69. After the heat of the flue gas is utilized, it is cooled and passed through a pipe into the air inlet pipe 42 for purification before being discharged.

[0032] Furthermore, the evaporator 7 includes a mounting bracket 71, an evaporator body 72, a partition plate 73, a guide partition plate 74, and a capillary tube assembly 75. The mounting bracket 71 is fixedly connected to the upper side of the base plate 1. The evaporator body 72 is fixedly connected to the inner side of the mounting bracket 71. Two sets of partition plates 73 are fixedly connected to the inner side of the evaporator body 72. The capillary tube assembly 75 is fixedly connected between the two sets of partition plates 73. The guide partition plate 74 is evenly distributed between the capillary tube assembly 75 and the inner wall of the evaporator body 72. The upper outer side of the evaporator body 72 is connected to the steam outlet 69 through a pipe, and the lower outer side of the evaporator body 72 is connected to the connecting pipe 45 through a pipe.

[0033] Wastewater generated during the N-phenylmaleimide production process enters the evaporation body 72 of evaporator 7. Evaporator 72 is equipped with inlet and outlet ports. Wastewater enters through the inlet port and is enclosed by a second capillary tube assembly 75. Steam generated by waste heat boiler 6 is introduced into the outer area of ​​the second capillary tube assembly 75 of evaporator 7 via steam outlet 69. After passing through guide baffle 74, the steam comes into efficient contact with the second capillary tube assembly 75, forming a high-efficiency heat exchange structure as a heat source, causing the wastewater to evaporate and concentrate. After condensation, the steam flows back to the liquid tank 44 through a pipeline as makeup water for spraying. A waste treatment process for the production of N-phenylmaleimide includes the following steps: S1. Waste residue pretreatment: The solid waste residue generated during the production of N-phenylmaleimide is fed into carbonization furnace 2 for carbonization and converted into activated carbon matrix; the carbonized material is mixed with the modified agent in a stirring mechanism 3 in a certain proportion for soaking and modification to produce a high-efficiency adsorbent. S2, Waste gas adsorption and purification: The high-efficiency adsorbent prepared in S1 is filled into the adsorption bed of the spray tower group 4; the waste gas generated during the production of N-phenylmaleimide is introduced into the spray tower group 4 so that the waste gas comes into contact with the adsorbent for adsorption and purification; at the same time, the spray assembly 48 is started for auxiliary washing; the purified gas is discharged after demisting. S3, Wastewater Evaporation Concentration and Co-incineration: Wastewater generated during the production of N-phenylmaleimide is passed into evaporator 7 for evaporation and concentration to obtain a high-concentration concentrate; the waste residue saturated by adsorption in S2 is mixed with the high-concentration concentrate and then sent to incineration unit 5 for incineration. S4. Energy recycling: The high-temperature flue gas generated by combustion in S3 is passed into the waste heat boiler 6 to heat the soft water therein to generate steam; the steam is used as the heat source for the evaporation of wastewater in S3, and the steam is recovered after condensation as the spray water for the spray tower group 4; the cooled flue gas discharged from the waste heat boiler 6 is passed into the spray tower group 4 of S2 for purification before being discharged.

[0034] Furthermore, the modifying agent is a dilute phosphoric acid solution or a zinc chloride solution.

[0035] The specific usage and function of this embodiment are as follows: The solid waste generated during the production of N-phenylmaleimide is first fed into carbonization furnace 2 for carbonization, and then converted into activated carbon matrix.

[0036] The carbonized material then enters the tank 31 of the stirring mechanism 3 through the feed port 32, while a modifying agent (dilute phosphoric acid or zinc chloride solution) is added through the injection pipe 33, and the mixture is soaked in a certain proportion. Motor 35 drives the stirring shaft 36 to rotate, ensuring thorough mixing of the material and the agent, completing the modification process. This process significantly increases its specific surface area and adsorption activity, forming a highly efficient adsorbent. The modified adsorbent is discharged through the discharge pipe 34 and then dried by an external dryer for subsequent waste gas adsorption.

[0037] The waste gas generated during the production of N-phenylmaleimide enters the tower body 41 of the spray tower group 4 through the inlet pipe 42. The tower is equipped with multiple layers of baffles 46, which are mesh-like and used to support the adsorbent bed. The waste residue, which has been carbonized and modified to form a high-efficiency adsorbent, is added into the baffles 46 through the feed port 43 and the inlet pipe 42 to form an adsorption bed. As the waste gas rises, it comes into contact with the adsorbent, and the pollutants are adsorbed and purified.

[0038] The spray system is driven by spray assembly 48: the spray liquid in the liquid tank 44 is lifted by the circulation pump 481, and delivered to the central pipe 482 and the side branch pipe 483 through the liquid supply pipe 485, and finally sprayed evenly by the nozzles 484 to enhance the adsorption and washing effect. The spray liquid is returned to the liquid tank for recycling. The purified gas is discharged after the top demister 47 removes the mist droplets.

[0039] Wastewater generated during the N-phenylmaleimide production process enters the evaporation body 72 of evaporator 7. Evaporator 72 is equipped with inlet and outlet ports. Wastewater enters through the inlet port and is enclosed by a second set of capillary tubes 75. Steam generated by waste heat boiler 6 is introduced into the outer area of ​​the second set of capillary tubes 75 in evaporator 7 through steam outlet 69. After passing through guide baffle 74, the steam comes into efficient contact with the second set of capillary tubes 75, forming a high-efficiency heat exchange structure as a heat source, causing the wastewater to evaporate and concentrate. After condensation, the steam flows back to the liquid tank 44 through a pipeline as makeup water for spraying.

[0040] The concentrated high-concentration wastewater is introduced into the incineration unit 5 through an external pipeline. The adsorbed saturated waste residue and high-concentration wastewater enter the incineration unit 5 through the feeding assembly 55: the motor 2 551 drives the auger 552 to transport the material to the furnace body 52 through the transport trough 553 and the inlet trough 554.

[0041] Simultaneously, combustion air enters the furnace body 52 tangentially through the inlet pipe 54, promoting combustion disturbance. The high-temperature flue gas generated from combustion enters the heat exchange furnace body 62 of the waste heat boiler 6 through the flue gas pipe 610, flows through the capillary tube group 64, and soft water is added to the steam chamber 67 through the upper water inlet pipe 68. The soft water in the steam chamber 67 is transported to the outer area of ​​the capillary tube group 64 through the heating water pipe 66, and guided by the guide baffle 65 to fully contact the capillary tube group 64, generating steam. The steam is collected in the steam chamber 67 and supplied to the evaporator 7 through the steam outlet 69. After the heat of the flue gas is utilized, it is cooled and passed through a pipe into the air inlet pipe 42 for purification before being discharged.

[0042] This process forms a closed-loop treatment: the waste residue is carbonized and modified for use in waste gas adsorption; the wastewater is evaporated and concentrated and then incinerated together with the saturated adsorbent; the heat energy from the incineration is recovered by a waste heat boiler to generate steam to drive the evaporation of wastewater, and the steam condensate is used to supplement the spray system.

[0043] The entire device is integrated and fixed by the base plate 1, and each unit is connected by pipelines, realizing the coordinated treatment of waste, waste gas, wastewater, and solid waste, material reuse and energy recovery in stages, which significantly improves the treatment efficiency and resource utilization level.

[0044] 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 alterations 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 waste treatment device for the production of N-phenylmaleimide, comprising a base plate (1), characterized in that: A carbonization furnace (2), a stirring mechanism (3), a spray tower group (4), and a combustion mechanism (5) are fixedly installed on the upper side of the base plate (1). The top of the combustion mechanism (5) is connected to the waste heat boiler (6), and the other end of the waste heat boiler (6) is connected to the evaporator (7). The evaporator (7) is connected to the spray tower group (4). The stirring mechanism (3) includes a stirring component, a feeding port (32), and a liquid injection pipe (33). The stirring component is fixedly installed on the upper side of the base plate (1), and the feeding port (32) and liquid injection pipe (33) are provided on the upper side of the stirring component. The spray tower group (4) includes a spray tower, a liquid tank (44), and a spray assembly (48). The spray tower is fixedly connected to the upper side of the base plate (1), the liquid tank (44) is installed at the bottom of the spray tower, and the spray assembly (48) is provided on the inner side of the spray tower. The waste residue is carbonized by the carbonization furnace (2), modified by the stirring mechanism (3) to form an adsorbent bed, and sent into the spray tower to adsorb the waste gas. The evaporator (7) evaporates the wastewater to produce a high-concentration concentrate and puts it into the incineration mechanism (5) for incineration. The generated high-temperature flue gas is fed into the waste heat boiler (6), so that the waste heat boiler (6) generates steam to supply the evaporator (7). The condensate generated by the evaporator (7) is supplied to the liquid tank (44).

2. The waste treatment device for N-phenylmaleimide production according to claim 1, characterized in that: The stirring component includes a tank (31), a discharge pipe (34), a motor (35), and a stirring shaft (36). The tank (31) is fixedly connected to the upper side of the bottom plate (1). The motor (35) is fixedly connected to the outer side of the tank (31). The output end of the motor (35) is fixedly connected to the stirring shaft (36). The other end of the stirring shaft (36) is rotatably connected to the inner wall of the tank (31). The upper side of the tank (31) is connected to the feeding port (32) and the liquid injection pipe (33). The side of the tank (31) away from the motor (35) is connected to the discharge pipe (34).

3. The waste treatment device for N-phenylmaleimide production according to claim 1, characterized in that: The spray tower includes a tower body (41), an air inlet pipe (42), a feed port (43), a connecting pipe (45), a partition plate (46), and a demister (47). The tower body (41) is fixedly connected to the upper side of the bottom plate (1). The air inlet pipe (42) is connected to the lower side of the tower body (41). The partition plate (46) is evenly distributed on the inner side of the tower body (41). Two sets of feed ports (43) are installed on the outer side of the tower body (41). The two sets of feed ports (43) correspond to the two sets of upper partition plates (46). The air inlet pipe (42) corresponds to the lower partition plate (46). The demister (47) is installed on the upper inner side of the tower body (41). The bottom of the tower body (41) is connected to the liquid tank (44). The connecting pipe (45) is connected to the outer side of the liquid tank (44).

4. The waste treatment device for N-phenylmaleimide production according to claim 3, characterized in that: The spray assembly (48) includes a circulating pump (481), a central pipe (482), a side branch pipe (483), a nozzle (484), and a liquid supply pipe (485). The circulating pump (481) is fixedly connected to the upper side of the base plate (1). The inlet end of the circulating pump (481) is connected to the liquid tank (44). The outlet end of the circulating pump (481) is connected to the liquid supply pipe (485). Two sets of central pipes (482) are connected to the liquid supply pipe (485). The two sets of central pipes (482) correspond to the two sets of partitions (46) on the upper side. The central pipes (482) are connected to evenly distributed side branch pipes (483). The lower sides of the central pipes (482) and the side branch pipes (483) are connected to evenly distributed nozzles (484).

5. The waste treatment device for N-phenylmaleimide production according to claim 1, characterized in that: The incineration mechanism (5) includes a support leg (51), a furnace body (52), a support plate (53), an inlet pipe (54), and a feeding assembly (55). The support leg (51) is fixedly connected to the upper side of the bottom plate (1), and the furnace body (52) is fixedly connected to the upper side of the support leg (51). The inlet pipe (54) and the feeding assembly (55) are connected to the outer side of the furnace body (52). The inlet pipe (54) and the feeding assembly (55) are tangentially inserted into the interior of the furnace body (52).

6. The waste treatment device for N-phenylmaleimide production according to claim 5, characterized in that: The feeding assembly (55) includes a second motor (551), an auger (552), a transport trough (553), and an inlet trough (554). The outer side of the furnace body (52) is connected to the inlet trough (554), and the upper side of the inlet trough (554) is connected to the transport trough (553). The outer side of the transport trough (553) is fixedly connected to the second motor (551), and the output end of the second motor (551) is fixedly connected to the auger (552). The other end of the auger (552) is rotatably connected to the inner wall of the transport trough (553).

7. The waste treatment device for N-phenylmaleimide production according to claim 6, characterized in that: The waste heat boiler (6) includes a mounting frame (61), a heat exchange furnace body (62), a partition plate (63), a capillary tube assembly (64), a guide partition plate (65), a water pipe (66), a steam chamber (67), a water supply pipe (68), a steam outlet (69), and a flue gas pipe (610). The mounting frame (61) is fixedly connected to the upper side of the base plate (1), the heat exchange furnace body (62) is fixedly connected to the inner side of the mounting frame (61), and two sets of partition plates (63) are fixedly connected to the inner side of the heat exchange furnace body (62). A capillary tube assembly (64) is installed between the two sets of partition plates (63). A uniformly distributed guide partition (65) is installed on the outside of the capillary tube assembly (64). A uniformly distributed water pipe (66) is connected to the upper side of the heat exchange furnace body (62). A steam chamber (67) is connected to the upper side of the water pipe (66). A water supply pipe (68) and a steam outlet (69) are connected to the upper side of the steam chamber (67). A flue gas pipe (610) is connected between one end of the heat exchange furnace body (62) and the top of the furnace body (52).

8. The waste treatment device for N-phenylmaleimide production according to claim 7, characterized in that: The evaporator (7) includes a second mounting bracket (71), an evaporator body (72), a second partition plate (73), a second guide partition plate (74), and a second capillary tube assembly (75). The second mounting bracket (71) is fixedly connected to the upper side of the base plate (1). The evaporator body (72) is fixedly connected to the inner side of the second mounting bracket (71). Two sets of second partition plates (73) are fixedly connected to the inner side of the evaporator body (72). The second capillary tube assembly (75) is fixedly connected between the two sets of second partition plates (73). The second capillary tube assembly (75) and the inner wall of the evaporator body (72) are installed with evenly distributed second guide partition plates (74). The upper outer side of the evaporator body (72) is connected to the steam outlet (69) through a pipe. The lower outer side of the evaporator body (72) is connected to the connecting pipe (45) through a pipe.

9. A waste treatment process for the production of N-phenylmaleimide, applied to the waste treatment device for the production of N-phenylmaleimide as described in any one of claims 1-8, characterized in that: Includes the following steps: S1. Waste residue pretreatment: The solid waste residue generated during the production of N-phenylmaleimide is put into the carbonization furnace (2) for carbonization and converted into activated carbon matrix; the carbonized material and the modified agent are mixed and soaked in the stirring mechanism (3) in proportion and modified to make a high-efficiency adsorbent. S2, Waste gas adsorption and purification: The high-efficiency adsorbent prepared in S1 is filled into the adsorption bed of the spray tower group (4); the waste gas generated during the production of N-phenylmaleimide is introduced into the spray tower group (4) so ​​that the waste gas comes into contact with the adsorbent for adsorption and purification; at the same time, the spray assembly (48) is started for auxiliary washing; the purified gas is discharged after demisting. S3, Wastewater Evaporation Concentration and Co-incineration: Wastewater generated during the production of N-phenylmaleimide is passed into an evaporator (7) for evaporation and concentration to obtain a high-concentration concentrate; the waste residue saturated by adsorption in S2 is mixed with the high-concentration concentrate and then sent to the incineration unit (5) for incineration. S4, Energy recycling: The high-temperature flue gas generated by the incineration in S3 is passed into the waste heat boiler (6) to heat the soft water therein to generate steam; the steam is used as the heat source for the evaporation of wastewater in S3, and the steam is condensed and recovered as the spray water for the spray tower group (4); the cooled flue gas discharged from the waste heat boiler (6) is passed into the spray tower group (4) of S2 for purification before being discharged.

10. The waste treatment process for the production of N-phenylmaleimide according to claim 9, characterized in that: The modified agent is a dilute phosphoric acid solution or a zinc chloride solution.

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