A waste liquid recovery device for polyimide production

Abstract

The application belongs to the technical field of chemical industry and discloses a waste liquid recovery equipment for polyimide preparation. The application aims to solve the problems of inaccurate temperature and pressure control and energy waste in the waste liquid treatment process. By accurately controlling the waste liquid injection, the pressure and temperature of the heat preservation tank, and the solvent evaporation and condensation process, the single extraction and recovery of various reagents are realized. The application adopts dynamic adjustment of internal pressure and temperature to ensure the purity and efficiency of the recovered solvent. At the same time, through the electromagnetic pressure control valve and the condenser and other devices, the solvent in the steam state is effectively discharged and condensed for recovery. The cold surface of the semiconductor refrigeration sheet is utilized to fully ensure the condensation effect of the steam. Combined with the dynamically controlled temperature and pressure, the extraction of the reagent is more stable, the evaporation of other miscellaneous reagents is avoided, the good purity is ensured, the production cost and the subsequent treatment difficulty are reduced, and the cost is reduced and the environment is protected.

Description

Technical Field

[0001] This invention belongs to the field of chemical technology, specifically relating to a waste liquid recovery device for polyimide preparation. Background Technology

[0002] Waste liquid treatment has always been a critical aspect of chemical production and laboratory research. Traditional waste liquid treatment methods are often limited by the imprecision of temperature and pressure control, making it difficult to effectively treat and recover waste liquids containing a mixture of multiple reagents. Traditional methods also suffer from energy waste, negative environmental impacts, and increased complexity and cost of subsequent treatment.

[0003] Current waste liquid treatment technologies typically employ physical, chemical, and mechanical methods such as distillation, filtration, and centrifugation. However, these methods have limitations when treating waste liquids containing multiple reagents. The process of accurately separating and recovering different solvents is complex, and maintaining the purity of the recovered solvent often requires multiple treatment steps or the addition of various chemical additives. This not only makes recovery time-consuming and labor-intensive but also makes it difficult to save energy and protect the environment. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a waste liquid recycling device for polyimide preparation, which can accurately control the treatment process of mixed waste liquid of various reagents, achieve efficient recycling, and make breakthrough progress in reducing energy consumption, protecting the environment, reducing production costs and the difficulty of subsequent treatment.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A waste liquid recycling device for polyimide production includes a storage tank. An insulated tank, communicating with its interior, is fixedly connected to the upper end of the storage tank. A steam collection chamber, also communicating with its interior, is fixedly connected to the upper end of the insulated tank. The steam collection chamber is located near one end of the insulated tank. A constant pressure pipe, controlled by electromagnetic induction, is connected to the side of the steam collection chamber. A manifold assembly, communicating with its interior, is fixedly connected to the upper end of the steam collection chamber. Several condensers, communicating with their interior, are fixedly connected to the output end of the manifold assembly. A temperature control component is installed through the end of the insulated tank away from the steam collection chamber. A distillation controller is installed through the other end of the insulated tank. A hydraulic pump is fixedly connected to the end of the storage tank, and the output end of the hydraulic pump is connected to the input end of the distillation controller.

[0007] Furthermore, the heat preservation tank includes end caps fixedly connected at both ends, and a dividing seat fixedly connected between the two end caps. The dividing seat divides the internal space of the heat preservation tank into two independent closed chambers, and a number of reinforcing ribs are fixedly connected between the two end caps.

[0008] Furthermore, a feeding pump is fixedly connected inside the storage tank, and the output end of the feeding pump is connected to a feeding pipe. The upper end of the feeding pipe passes through the upper surface and end cap of the storage tank and communicates with the inside of the insulation tank. A controller is fixedly connected to the end of the storage tank, and the controller is electrically connected to the feeding pump.

[0009] Furthermore, the temperature control component includes a semiconductor cooling chip disposed on the outer side of the end of the insulation tank. Fins are disposed on both sides of the semiconductor cooling chip. A heat pipe is disposed on the fins near the end of the insulation tank. The heat pipe extends into the interior of the insulation tank through the end cap. A sealing seat is fixedly connected to the periphery of the connection between the heat pipe and the end cap. The sealing seat is fixedly connected to the end cap. Several heat exchange plates are fixedly connected to the periphery of the heat pipe inside the insulation tank, and guide holes are staggered on the surface of adjacent heat exchange plates.

[0010] Furthermore, the thermoelectric cooler is provided with a heat insulation box and a protective cover on both sides, the heat insulation box and the protective cover are fixedly connected, the heat insulation box and the protective cover are in communication, the thermoelectric cooler is fixedly connected between the heat insulation box and the interior of the protective cover, the protective cover is fixedly connected to the sealing seat, and a heat insulation cover is fixedly connected inside the protective cover.

[0011] Furthermore, the distillation controller includes a hydraulic cylinder and a control chamber fixedly connected at opposite ends. The hydraulic cylinder passes through the end cap of the insulation tank and is fixedly connected to the end cap. The control chamber passes through the dividing seat and is fixedly connected to the dividing seat. A telescopic sleeve is slidably connected to one end of the hydraulic cylinder connected to the control chamber. A fixed pipe is slidably connected inside the telescopic sleeve. The fixed pipe is fixedly connected to the other end of the hydraulic cylinder. An active piston and a hydraulic piston are fixedly connected to both ends of the telescopic sleeve. The active piston is slidably connected inside the control chamber. The hydraulic piston is slidably connected inside the hydraulic cylinder. A cooperating piston is also slidably connected inside the control chamber. A through hole communicating with the insulation tank is opened at the end of the control chamber away from the hydraulic cylinder. A sealing sleeve is fixedly connected to the inner wall of the control chamber. The telescopic sleeve passes through the sealing sleeve and is slidably connected to the sealing sleeve.

[0012] Furthermore, the manifold assembly includes a one-way transmission pipe with one end connected to the steam collection chamber, and the side wall of the one-way transmission pipe is connected to a branch pipe corresponding to the number of condensers, and an electromagnetic pressure control valve is installed on the branch pipe.

[0013] Furthermore, the condenser includes a condenser tank, the upper end of which has a steam inlet connected to a branch pipe, and the lower end of which has a manifold for discharging liquid. Sealing plates are fixedly connected to the inner walls of both ends of the condenser tank, and several heat exchange tubes pass through the opposing surfaces of the two sealing plates. An adapter is fixedly connected to both ends of the condenser tank, and the lower end of the adapter has a condensate outlet. The condenser also includes a pressure booster shroud, which is fixedly connected to the adapter, and a fan is fixedly connected inside the pressure booster shroud.

[0014] Furthermore, it also includes a water storage tank, on the side wall of which are fixedly connected several drain pipes communicating with its interior, and the other end of each drain pipe is connected to a corresponding condensate outlet.

[0015] Furthermore, the lower end of the condenser is connected to a mixing pipe, and the other end of the mixing pipe is connected to a secondary condenser pipe, which passes through the insulation box and the fins.

[0016] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0017] A fixed connection refers to a connection in which parts or components are fixed in place, with no relative movement between them. These connections are divided into two types: detachable and non-detachable.

[0018] (1) Detachable connections use screws, splines, wedges, etc. to fix parts together. This type of connection can be disassembled during maintenance without damaging the parts. However, the specifications of the connecting parts used must be correct (such as the length of bolts, keys, wedges) and properly tightened.

[0019] (2) Non-removable connections mainly refer to welding, riveting, and tenon joints. Since disassembly is required by forging, sawing, or oxy-acetylene cutting during repair or replacement, the parts generally cannot be reused. At the same time, attention should be paid to the process quality, technical inspection, and remedial measures (such as correction, polishing, etc.) when making connections.

[0020] A threaded connection is a detachable connection in which threaded parts (or the threaded portion of the connected parts) are joined together as one unit.

[0021] A sliding connection refers to two objects that are in contact but not fixed, and can slide relative to each other.

[0022] A rotating connection is a connection between parts that allows the parts to rotate relative to each other.

[0023] The beneficial effects of this invention are:

[0024] This solution first pumps a certain amount of waste liquid stored in the storage tank into the insulation tank using a feed pump, then disconnects the connection. Subsequently, a hydraulic pump extracts and / or pumps hydraulic oil through a fixed pipe, causing a change in the distance between the cooperating piston and the active piston, creating a negative pressure and / or high pressure state inside the insulation tank. The control box controls the power of the thermoelectric cooler in the temperature control component, creating a low-temperature environment within the insulation box. Simultaneously, the hot side of the thermoelectric cooler transfers heat to the insulation tank through heat pipes, heating the waste liquid inside. Once the temperature reaches the preset value, the temperature control component maintains a constant temperature. Then, the hydraulic pump drives the hydraulic piston of the distillation controller, causing the hydraulic movement of the distillation controller to move the active piston via a telescopic sleeve, thus... When the active piston moves, the movement of the cooperating piston can be finely adjusted. The cooperating piston moves accordingly, which can dynamically regulate the pressure changes inside the heat preservation tank. In conjunction with the electromagnetic pressure control valve of the manifold assembly, the steam discharge volume can be dynamically controlled according to the pressure changes. This method can quickly and accurately control the evaporation temperature and pressure characteristics of the solvent to be extracted from the waste liquid during use. It can extract and recover multiple solvents with similar boiling points from the waste liquid in one go. Before internal heating, the internal pressure can be adjusted to high pressure or negative pressure according to the solvent characteristics. After heating to the specified temperature, when the internal temperature changes slightly, the internal pressure can be quickly and slightly adjusted to achieve dynamic control, avoiding the situation of multiple solvents being mixed and recovered during evaporation.

[0025] Meanwhile, the steam in this solution enters the designated solvent recovery condenser through the corresponding branch pipe of the manifold assembly. Then, under the action of the airflow generated by the fan, the condenser passes through the internal heat exchange tube, carrying away the heat of the steam. After the steam condenses, the condensed solvent mixed with a small amount of steam enters the mixing tube. After passing through the cold end of the semiconductor cooling chip in the insulation box, the steam is completely condensed in a low-temperature environment. This method condenses a large amount of steam, and the remaining small amount of steam heat can be fully dissipated in a relatively cold environment, which can match the cooling and heating ratio of the semiconductor cooling chip and ensure more complete solvent recovery, avoiding waste.

[0026] In summary, this solution enables precise pressure and temperature control of waste liquid containing multiple reagents, allowing for the individual extraction of different solvents. Generally, solvents are recovered sequentially from low to high boiling points, significantly reducing the production cost of polyimide, playing a positive role in environmental protection, ensuring high purity of the recovered solution, and greatly simplifying the post-processing purification steps. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0029] Figure 2 This is a three-dimensional cross-sectional structural schematic diagram of the present invention from another perspective;

[0030] Figure 3 This is a three-dimensional cross-sectional structural diagram of the insulated tank of the present invention;

[0031] Figure 4 This is a schematic diagram of the cross-section of the heat preservation tank of the present invention;

[0032] Figure 5 This is a three-dimensional structural schematic diagram of the manifold assembly of the present invention;

[0033] Figure 6 This is a three-dimensional cross-sectional structural diagram of the distillation controller of the present invention;

[0034] Figure 7 This is a three-dimensional cross-sectional structural diagram of the temperature control component of the present invention;

[0035] Figure 8 This is a three-dimensional cross-sectional structural diagram of the condenser of the present invention.

[0036] In the diagram: 1. Storage tank; 2. Insulated tank; 3. Manifold assembly; 31. One-way transfer pipe; 32. Branch pipe; 33. Electromagnetic pressure control valve; 4. Condenser; 41. Condenser tank; 42. Heat exchanger tube; 43. Sealing plate; 44. Adapter; 45. Condensate outlet; 46. Steam inlet; 47. Manifold; 5. Insulation box; 6. Temperature control assembly; 61. Semiconductor refrigeration chip; 62. Fin; 63. Heat pipe; 64. Sealing seat; 65. Heat exchanger plate; 66. Guide hole; 7. Distillation controller; 71. Liquid... 72. Pressure cylinder; 73. Telescopic sleeve; 74. Active piston; 75. Control chamber; 76. Coordinating piston; 77. Through hole; 78. Fixed pipe; 79. Hydraulic piston; 80. Sealing sleeve; 91. Hydraulic pump; 10. Controller; 11. Steam collection chamber; 12. Water storage tank; 13. Fan; 14. Feed pump; 15. Feed pipe; 16. Mixing pipe; 17. End cap; 18. Dividing seat; 19. Pressure booster cover; 20. Protective cover; 21. Secondary condenser pipe; 22. Reinforcing rib; 23. Waste liquid inlet; 24. Drain pipe. Detailed Implementation

[0037] 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.

[0038] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0039] like Figure 1-8 As shown, a waste liquid recycling device for polyimide preparation includes a storage tank 1. An insulated tank 2, communicating with the interior of the storage tank 1, is fixedly connected to the upper end of the storage tank 1. A steam collection chamber 10, communicating with the interior of the insulated tank 2, is fixedly connected to the upper end of the insulated tank 2. The steam collection chamber 10 is located near one end of the insulated tank 2. A constant pressure pipe with electromagnetic control is connected to the side of the steam collection chamber 10. A manifold assembly 3, communicating with the interior of the steam collection chamber 10, is fixedly connected to the upper end of the steam collection chamber 10. Several condensers 4, communicating with the interior of the manifold assembly 3, are fixedly connected to the output end of the manifold assembly 3. A temperature control component 6 is installed through the end of the insulated tank 2 away from the steam collection chamber 10. A distillation controller 7 is installed through the other end of the insulated tank 2. A hydraulic pump 8 is fixedly connected to the end of the storage tank 1. The output end of the hydraulic pump 8 is connected to the input end of the distillation controller 7.

[0040] Storage tank 1 serves as a wastewater storage unit, accumulating wastewater for later processing once a certain volume is reached. It also collects residual wastewater after extraction for unified treatment. Insulation tank 2 maintains the temperature and pressure of the wastewater, ensuring a suitable environment for recycling. Steam collection chamber 10 collects steam and separates it from the waste liquid. After the insulation tank 2 is filled with waste liquid, a small space is created in the steam collection chamber 10 to extract the small amount of solvent vapor from the waste liquid. A constant pressure pipe on one side removes excess air from the insulation tank 2 during wastewater entry and exit, maintaining pressure balance inside and outside the insulation tank 2 when it is open. Temperature control component 6 controls the temperature rise of the waste liquid in insulation tank 2. Distillation controller 7 dynamically regulates the heating and evaporation process of the waste liquid in insulation tank 2. Hydraulic pump 8 dynamically regulates the operation of distillation controller 7.

[0041] In one embodiment of the present invention, the heat-insulating tank 2 includes end caps 16 fixedly connected at both ends, and a dividing seat 17 fixedly connected between the two end caps 16. The dividing seat 17 divides the internal space of the heat-insulating tank 2 into two independent closed chambers, and a plurality of reinforcing ribs 21 are fixedly connected between the two end caps 16. The dividing seat 17 is provided to cooperate with the installation of the distillation controller 7, ensuring the sealing of the installation of the distillation controller 7. At the same time, the two end caps 16 can ensure the sealing of both ends of the heat-insulating tank 2, and combined with the tensile force of the reinforcing ribs 21, it has better compressive strength.

[0042] In one embodiment of the present invention, a feed pump 13 is fixedly connected inside the storage tank 1. The output end of the feed pump 13 is connected to a feed pipe 14. The upper end of the feed pipe 14 passes through the upper surface of the storage tank 1 and the end cap 16 in sequence, communicating with the inside of the insulation tank 2. A controller 9 is fixedly connected to the end of the storage tank 1, and the controller 9 is electrically connected to the feed pump 13. The controller 9 can control the operation of the feed pump 13, which can transfer raw materials. Combined with the feed pipe 14, it can extract and / or pump waste liquid into the insulation tank 2, and facilitate quantitative control of waste liquid transfer.

[0043] In one embodiment of the present invention, the temperature control component 6 includes a semiconductor cooling chip 61 disposed on the outer side of the end of the insulation tank 2. Fins 62 are disposed on both sides of the semiconductor cooling chip 61. A heat pipe 63 is disposed on the fin 62 near the end of the insulation tank 2. The heat pipe 63 extends into the insulation tank 2 through the end cap 16. A sealing seat 64 is fixedly connected to the periphery of the connection between the heat pipe 63 and the end cap 16. The sealing seat 64 is fixedly connected to the end cap 16. Several heat exchange plates 65 are fixedly connected to the periphery of the heat pipe 63 inside the insulation tank 2, and guide holes 66 are staggered on the surfaces of adjacent heat exchange plates 65. The fins 62 provide excellent temperature conduction, allowing the temperature on both sides of the semiconductor cooling chip 61 to dissipate quickly. By providing the sealing seat 64, the sealing seat 64 ensures the airtightness between the heat pipe 63 and the insulation tank 2, thus ensuring the stability of the heat pipe 63 during heat conduction. The heat exchange plate 65 assists the heat pipe 63 in dissipating heat, making the heating more uniform through temperature conduction. At the same time, the guide holes 66 on the surface allow the water to flow in a direction, ensuring full contact with the heat exchange plate 65 and guaranteeing sufficient heating.

[0044] In one embodiment of the present invention, a heat insulation box 5 and a protective cover 19 are provided on both sides of the thermoelectric cooler 61. The heat insulation box 5 and the protective cover 19 are fixedly connected and communicate with each other internally. The thermoelectric cooler 61 is fixedly connected between the heat insulation box 5 and the interior of the protective cover 19. The protective cover 19 is fixedly connected to the sealing seat 64, and a heat insulation shield is fixedly connected inside the protective cover 19. The heat insulation shield can protect the hot surface temperature of the thermoelectric cooler 61, allowing its heat to be quickly and fully dissipated through the heat pipe 63; at the same time, the protective cover 19 can accumulate the cold surface temperature of the thermoelectric cooler 61, creating a lower temperature environment to facilitate the condensation of residual vapor.

[0045] In one embodiment of the present invention, the distillation controller 7 includes a hydraulic cylinder 71 and a regulating chamber 74 fixedly connected at opposite ends. The hydraulic cylinder 71 passes through the end cap 16 of the heat preservation tank 2 and is fixedly connected to the end cap 16. The regulating chamber 74 passes through the dividing seat 17 and is fixedly connected to the dividing seat 17. One end of the hydraulic cylinder 71 connected to the regulating chamber 74 is slidably connected to a telescopic sleeve 72. A fixed tube 77 is slidably connected inside the telescopic sleeve 72. The fixed tube 77 is fixedly connected to the other end of the hydraulic cylinder 71. An active piston 73 and a hydraulic piston 78 are fixedly connected to both ends of the telescopic sleeve 72. The active piston 73 is slidably connected inside the regulating chamber 74. The hydraulic piston 78 is slidably connected inside the hydraulic cylinder 71. A cooperating piston 75 is also slidably connected inside the regulating chamber 74. The end of the regulating chamber 74 away from the hydraulic cylinder 71 has a through hole 76 communicating with the heat preservation tank 2. A sealing sleeve 79 is fixedly connected to the inner wall of the regulating chamber 74. The telescopic sleeve 72 passes through the sealing sleeve 79 and is slidably connected to the sealing sleeve 79. The sealing sleeve 79 ensures that the telescopic sleeve 72 is in a sealed state when it slides, preventing leakage. It is also used in conjunction with the dividing seat 17 to further maintain the sealing performance.

[0046] In one embodiment of the present invention, the manifold assembly 3 includes a one-way transmission pipe 31 connected at one end to the steam collection chamber 10. The side wall of the one-way transmission pipe 31 is connected to branch pipes 32 corresponding to the number of condensers 4. An electromagnetic pressure control valve 33 is installed on the branch pipe 32. The one-way transmission pipe 31 can prevent steam backflow, and together with the electromagnetic pressure control valve 33, it can discharge steam in a metered manner, always maintaining a constant internal pressure, and effectively avoiding direct steam discharge that would cause depressurization in the insulation tank 2.

[0047] In practical applications, the heat preservation tank 2 is controlled by first pressurizing, then heating, and then controlling the pressure. The heating temperature is then adjusted to dynamically control the boiling point of the specified solvent for extraction.

[0048] In one embodiment of the present invention, the condenser 4 includes a condenser tank 41. The upper end of the condenser tank 41 has a steam inlet 46 communicating with a branch pipe 32, and the lower end of the condenser tank 41 has a manifold 47 for discharging liquid. Sealing plates 43 are fixedly connected to the inner walls of both ends of the condenser tank 41. Several heat exchange tubes 42 pass through the opposing surfaces of the two sealing plates 43. An adapter 44 is fixedly connected to both ends of the condenser tank 41. A condensate outlet 45 is provided at the lower end of the adapter 44. The condenser also includes a pressure booster shroud 18, which is fixedly connected to the adapter 44. A fan 12 is fixedly connected inside the pressure booster shroud 18. The adapter 44 in the condenser 4 enables connection and communication between multiple condensers 4, allowing cooling to be achieved through a single fan 12. This, combined with the single solvent condensation at a time, meets the usage requirements. The pressure booster shroud 18, in conjunction with the fan 12, accelerates the airflow after injection, ensuring that the accelerated airflow effectively cools the condenser 4.

[0049] In one embodiment of the present invention, a water storage tank 11 is further included. Several drain pipes 23, communicating with the interior of the water storage tank 11, are fixedly connected to its side wall. The other end of each drain pipe 23 is connected to a corresponding condensate outlet 45. The function of the water storage tank 11 is to drain accumulated water. When outside air enters the heat exchange tube 42, the alternation of hot and cold air generates condensate. If condensate accumulates, it will affect airflow and result in poor heat dissipation. By connecting the water storage tank 11 and the drain pipes 23, accumulated water can be effectively drained, ensuring condensation.

[0050] In one embodiment of the present invention, the manifold 47 at the lower end of the condenser 41 is connected to a mixing pipe 15, and the other end of the mixing pipe 15 is connected to a secondary condenser 20, which passes through the insulation box 5 and the fins 62. After the vapor flows on the surface of the heat exchange tube 42, the heat is dissipated and a large amount of condensation begins. Then, the condensed solvent mixed with a small amount of vapor passes through the mixing pipe 15 and through the insulation box 5 on the cold side of the semiconductor refrigeration chip 61 in the secondary condenser 20, so that it can be fully condensed at a lower temperature until the solution is discharged.

[0051] Working principle: During the polyimide preparation process, wastewater is continuously discharged into storage tank 1. When the amount of wastewater in storage tank 1 is greater than or equal to 95% of the volume of the insulation tank 2, controller 9 starts the feed pump 13, which feeds the waste liquid into the insulation tank 2 through the feed pipe 14 in a metered manner. Then the feed pump 13 is turned off, and the insulation tank 2 is disconnected from the storage tank.

[0052] Simultaneously, the hydraulic pump 8 adjusts the distance between the cooperating piston 75 and the active piston 73, ensuring a constant pressure within the insulation tank 2 as the cooperating piston 75 moves. Then, when the semiconductor cooling chip 61 activates, it heats the waste liquid within the insulation tank 2 via the heat pipe 63. As the heat increases, the pressure within the storage tank 1 increases, thus raising the solution's boiling point. At this point, the hydraulic pump 8 controls the movement of the hydraulic piston 78, which, through the telescopic sleeve 72, moves the active piston 73, causing the cooperating piston 75 to move slightly with it. This allows for dynamic adjustment of the internal pressure based on the solution's temperature changes. When the pressure and temperature within the insulation tank 2 reach the designated boiling point of the recovered solution, the electromagnetic pressure control valve 33 is opened, releasing the steam from the interior. Solvent is discharged, and the internal pressure is kept constant. When the temperature inside the heat preservation tank 2 fluctuates slightly, the distillation controller 7 coordinates and controls the internal environment to keep it at the boiling point of the specified solvent. When the vapor of the specified solvent evaporates into the one-way transmission pipe 31, it cannot flow back. It then passes through the electromagnetic pressure control valve 33 and enters the condenser 4. The fan 12 at one end of the condenser 4 pressurizes the air through the pressure booster shroud 18 and makes the air flow rapidly in the heat exchange tube 42. After the vapor flows on the surface of the heat exchange tube 42, the heat is dissipated and a large amount of condensation begins. Then the condensed solvent mixed with a small amount of vapor passes through the mixing pipe 15 and through the insulation box 5 on the cold side of the semiconductor cooling chip 61 in the secondary condenser pipe 20, so that it can fully condense at a lower temperature until the solution is discharged.

[0053] Meanwhile, when outside air passes through the heat exchange tube 42 in the condenser 4, if there is water accumulation, it can enter the water storage tank 11 through the drain pipe 23. When the recycling process is completed, the feed pipe 14 is opened to extract the residual waste liquid in the storage tank 1 and store it in the storage tank 1 for further processing.

[0054] By precisely controlling pressure and temperature, different solvents in the waste liquid can be extracted and recovered individually, improving the efficiency and quality of waste liquid treatment. Simultaneously, the combination of a semiconductor cooling chip 61 and a temperature control component 6 enables heating and cooling control of the waste liquid, saving energy consumption and reducing carbon emissions. This not only effectively extracts solvents from the waste liquid, achieving resource reuse and reducing waste emissions, thus playing a positive role in environmental protection, but also reduces raw material consumption and post-processing costs during production through precise waste liquid treatment and resource recovery, thereby improving production efficiency and economic benefits.

[0055] It should be noted that the upper surface of the storage tank 1 is provided with a waste liquid inlet 22 for easy discharge of waste liquid. At the same time, mounting parts are provided at the four corners of the lower end of the storage tank 1 for easy fixed installation.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A waste liquid recycling device for polyimide preparation, comprising a storage tank (1), characterized in that, The upper end of the storage tank (1) is fixedly connected to a heat-insulating tank (2) communicating with its interior. The upper end of the heat-insulating tank (2) is fixedly connected to a steam collection chamber (10) communicating with its interior. The steam collection chamber (10) is close to one end of the heat-insulating tank (2). The side of the steam collection chamber (10) is connected to a constant pressure pipe with electromagnetic control for switching on and off. The upper end of the steam collection chamber (10) is fixedly connected to a manifold assembly (3) communicating with its interior. The output end of the manifold assembly (3) is fixedly connected to several condensers (4) communicating with its interior. A temperature control assembly (6) is installed through the end of the heat-insulating tank (2) away from the steam collection chamber (10). A distillation controller (7) is installed through the other end of the heat-insulating tank (2). A hydraulic pump (8) is fixedly connected to the end of the storage tank (1). The output end of the hydraulic pump (8) is connected to the input end of the distillation controller (7). The distillation controller (7) includes a hydraulic cylinder (71) and a regulating chamber (74) fixedly connected at opposite ends. The hydraulic cylinder (71) passes through the end cap (16) of the heat preservation tank (2) and is fixedly connected to the end cap (16). The regulating chamber (74) passes through the dividing seat (17) and is fixedly connected to the dividing seat (17). One end of the hydraulic cylinder (71) connected to the regulating chamber (74) is slidably connected to a telescopic sleeve (72). A fixed tube (77) is slidably connected inside the telescopic sleeve (72). The fixed tube (77) is fixedly connected to the other end of the hydraulic cylinder (71). The two ends of 72) are fixedly connected to an active piston (73) and a hydraulic piston (78). The active piston (73) is slidably connected in the control chamber (74). The hydraulic piston (78) is slidably connected in the hydraulic cylinder (71). The control chamber (74) is also slidably connected to a cooperating piston (75). The end of the control chamber (74) away from the hydraulic cylinder (71) is provided with a through hole (76) that communicates with the heat preservation tank (2). The inner wall of the control chamber (74) is fixedly connected to a sealing sleeve (79). The telescopic sleeve (72) passes through the sealing sleeve (79) and is slidably connected to the sealing sleeve (79). The manifold assembly (3) includes a one-way transmission pipe (31) connected to the steam collection chamber (10) at one end. The side wall of the one-way transmission pipe (31) is connected to a branch pipe (32) corresponding to the number of condensers (4). An electromagnetic pressure control valve (33) is installed on the branch pipe (32).

2. The waste liquid recovery equipment for polyimide preparation according to claim 1, characterized in that, The heat preservation tank (2) includes end caps (16) fixedly connected at both ends, and a dividing seat (17) fixedly connected between the two end caps (16). The dividing seat (17) divides the internal space of the heat preservation tank (2) into two independent closed chambers. Several reinforcing ribs (21) are fixedly connected between the two end caps (16).

3. The waste liquid recovery equipment for polyimide preparation according to claim 2, characterized in that, A feed pump (13) is fixedly connected inside the storage tank (1). The output end of the feed pump (13) is connected to a feed pipe (14). The upper end of the feed pipe (14) passes through the upper surface of the storage tank (1) and the end cap (16) in sequence and is connected to the inside of the heat preservation tank (2). A controller (9) is fixedly connected to the end of the storage tank (1). The controller (9) is electrically connected to the feed pump (13).

4. The waste liquid recovery equipment for polyimide preparation according to claim 2, characterized in that, The temperature control component (6) includes a semiconductor cooling chip (61) disposed on the outer side of the end of the heat preservation tank (2). Fins (62) are disposed on both sides of the semiconductor cooling chip (61). A heat pipe (63) is disposed on the fin (62) near the heat preservation tank (2). The heat pipe (63) extends into the heat preservation tank (2) through the end cap (16) at the end of the heat preservation tank (2). A sealing seat (64) is fixedly connected to the periphery of the connection between the heat pipe (63) and the end cap (16). The sealing seat (64) is fixedly connected to the end cap (16). Several heat exchange plates (65) are fixedly connected to the periphery of the heat pipe (63) located inside the heat preservation tank (2), and guide holes (66) are staggered on the surface of adjacent heat exchange plates (65).

5. The waste liquid recovery equipment for polyimide preparation according to claim 4, characterized in that, The thermoelectric cooler (61) has a heat insulation box (5) and a protective cover (19) on both sides. The heat insulation box (5) and the protective cover (19) are fixedly connected. The heat insulation box (5) and the protective cover (19) are internally connected. The thermoelectric cooler (61) is fixedly connected between the heat insulation box (5) and the protective cover (19). The protective cover (19) is fixedly connected to the sealing seat (64). A heat insulation cover is fixedly connected inside the protective cover (19).

6. The waste liquid recovery equipment for polyimide preparation according to claim 4, characterized in that, The condenser (4) includes a condenser tank (41), the upper end of which is provided with a steam inlet (46) communicating with a branch pipe (32), the lower end of which is provided with a manifold (47) for discharging liquid, the inner walls of both ends of the condenser tank (41) are fixedly connected with sealing plates (43), the opposite surfaces of the two sealing plates (43) are connected with a number of heat exchange tubes (42), the two ends of the condenser tank (41) are fixedly connected with adapters (44), the lower end of the adapters (44) is provided with a condensate outlet (45), and also includes a pressure booster shroud (18), the pressure booster shroud (18) is fixedly connected to the adapters (44), and a fan (12) is fixedly connected inside the pressure booster shroud (18).

7. The waste liquid recovery equipment for polyimide preparation according to claim 6, characterized in that, It also includes a water storage tank (11), on which several drain pipes (23) are fixedly connected and communicate with the interior. The other end of the drain pipes (23) is connected to the corresponding condensate outlet (45).

8. The waste liquid recovery equipment for polyimide preparation according to claim 6, characterized in that, The manifold (47) at the lower end of the condenser (41) is connected to a mixing pipe (15), and the other end of the mixing pipe (15) is connected to a secondary condenser pipe (20). The secondary condenser pipe (20) passes through the insulation box (5) and the fins (62).

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