A caprolactam recycling device based on coupling of jet flow evaporation and rectification

Abstract

The utility model discloses a kind of caprolactam recycling devices based on jet evaporation and rectification coupling, belong to caprolactam recycling technical field, its technical scheme main point includes distillation group, the front side of the top of the distillation group is communicated with inlet pipe, the bottom of the front side of the distillation group is communicated with discharge pipe, the surface of the inlet pipe and the surface of discharge pipe are all equipped with circulating mechanism, the right side of the circulating mechanism is equipped with recovery mechanism, by setting distillation group, inlet pipe, discharge pipe and circulating mechanism, distillation group is the distillation structure of the jet evaporator and rectification tower combination in prior art to caprolactam recovery, caprolactam raw materials can be sent into distillation group with the mode of fluid respectively by inlet pipe and carry out distillation, steam produced after distillation can be sent into circulating tank by discharge pipe, by caprolactam recycling structure formed by circulating tank and inlet valve pipe, exhaust valve pipe, heat shield, inner tank, cooling pipe and shunt pipe.

Description

Technical Field

[0001] This utility model relates to the field of caprolactam recycling technology, and in particular to a caprolactam recycling device based on the coupling of jet evaporation and distillation. Background Technology

[0002] As is well known, the caprolactam recycling device based on the coupling of jet evaporation and distillation is a recycling device that is designed for materials containing caprolactam generated during production or use. It uses jet evaporation technology to quickly separate caprolactam from impurities and solvents, and then combines it with distillation process for further purification, so as to achieve efficient separation, purification and recycling of caprolactam. This device improves resource utilization and reduces material loss.

[0003] During the production of caprolactam, especially during start-up and shutdown, a considerable amount of residual caprolactam aqueous solution is generated; a large amount of solid caprolactam is also generated during the cleaning of the finished product tank during system shutdown; in addition, a considerable amount of high-concentration caprolactam is also generated during the analysis and sampling process; the existing equipment cannot effectively and reasonably recycle these waste caprolactams.

[0004] Currently, an existing patent (publication number: CN208500812U) discloses a waste caprolactam recycling system, which includes a dissolving tank with a stirrer, a clarifying tank with an overflow plate inside, and a hydrocyclone separator. The top of the dissolving tank is provided with a feed port and a demineralized water feed pipeline. The bottom outlet of the dissolving tank is connected to the turbid liquid side of the overflow plate of the clarifying tank through a slurry pump and pipeline. The clear liquid side of the overflow plate of the clarifying tank is connected to the feed port of the hydrocyclone separator through a clear liquid discharge pump and pipeline. The overflow port of the hydrocyclone separator is connected to the caprolactam clear liquid intermediate tank through a pipeline. After applying this utility model to the recycling of residual caprolactam aqueous solution and solid caprolactam, it can effectively and reasonably recycle caprolactam from these waste materials, which can generate good economic benefits. Moreover, this utility model has a novel structure and reasonable setting, and the cost of recycling caprolactam is low.

[0005] To address the aforementioned issues, existing patents have provided solutions. However, in the recovery of caprolactam, the lack of a structure that utilizes heat recovery to improve the recovery efficiency of caprolactam means that heat recovery cannot be used to assist in the recovery of caprolactam, thus reducing the flexibility of caprolactam recovery.

[0006] To address this, a caprolactam recycling device based on the coupling of jet evaporation and distillation is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a caprolactam recycling device based on the coupling of jet evaporation and distillation, which can solve the problem that existing devices lack structures that can improve caprolactam recycling efficiency by means of heat energy recovery, thus reducing the flexibility of caprolactam recycling.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a caprolactam recycling and recovery device based on jet evaporation and distillation coupling, comprising a distillation group, an inlet pipe connected to the front side of the top of the distillation group, an outlet pipe connected to the bottom of the front side of the distillation group, a circulation mechanism provided on the surface of the inlet pipe and the surface of the outlet pipe, and a recovery mechanism provided on the right side of the circulation mechanism; the circulation mechanism includes a circulation tank, an inlet valve pipe, an outlet valve pipe, a heat insulation cover, an inner tank, a cooling pipe, and a diversion pipe, the inlet valve pipe being connected to the rear side of the outlet pipe, the outlet valve pipe being connected to the rear side of the inlet pipe, the circulation tank being connected to the bottom of the outlet valve pipe, the bottom of the circulation tank being connected to the top of the inlet valve pipe, the heat insulation cover being connected to the front side of the inner side of the circulation tank, the inner tank being connected to the inner side of the heat insulation cover, the front side of the inner tank being connected to the front side of the inner side of the circulation tank, the cooling pipe being provided on the surface of the inner tank, and the diversion pipe being provided at the bottom of the cooling pipe.

[0009] Preferably, the recycling mechanism includes a cooling component and a conveying component. The cooling component is disposed on the surface of the inlet pipe, and the inner side of the bottom of the cooling component is disposed on the surface of the outlet pipe. The conveying component is disposed between opposite sides of the cooling components, and the left side of the conveying component is connected to the cooling pipe and the diversion pipe respectively.

[0010] Preferably, the cooling assembly includes a heat collection tube, a liquid pump, a liquid delivery tube, heat dissipation fins, and a heat dissipation tube. The heat collection tube is sleeved on the surface of the discharge tube, the liquid pump is connected to the top of the heat collection tube, the liquid delivery tube is connected to the output end of the liquid pump, the heat dissipation fins are bolted to the surface of the liquid delivery tube, the heat dissipation tube is connected to the top of the liquid delivery tube, and the inner side of the heat dissipation tube is sleeved on the surface of the inlet tube.

[0011] Preferably, the conveying assembly includes an inlet pipe, an inlet pipe, an outlet pipe, and a return pipe. The inlet pipe is connected to the bottom of the heat dissipation pipe, the inlet pipe is connected to the inside of the inlet pipe, the left side of the inlet pipe is connected to the right side of the top of the cooling pipe and the right side of the top of the distribution pipe, the left side of the inlet pipe is connected to the top of the right side of the circulation tank, the outlet pipe is connected to the bottom of the right side of the circulation tank, the return pipe is connected to the inside of the outlet pipe, the left side of the return pipe is connected to the right side of the bottom of the cooling pipe and the right side of the bottom of the distribution pipe, and the front side of the outlet pipe is connected to the rear side of the heat collection pipe.

[0012] Preferably, the surface of the inner tank is covered with a heat-conducting metal mesh, and the surface of the heat-conducting metal mesh is in contact with the inner side of the cooling pipe and the inner side of the distribution pipe, respectively.

[0013] Preferably, the surface of the heat insulation cover is covered with a protective sleeve, and the surface of the protective sleeve is coated with a corrosion-resistant coating.

[0014] Preferably, a sealing ring is fitted on the surface of the input end of the liquid pump, and the surface of the sealing ring is engaged with the top of the heat collection tube.

[0015] Preferably, anti-slip sleeves are snapped onto the inner sides of both the heat collection tube and the heat dissipation tube, and the inner sides of the anti-slip sleeves are snapped onto the surfaces of the feed tube and the discharge tube, respectively.

[0016] Preferably, both the inlet pipe and the return pipe are covered with a heat-insulating sleeve, and the surface of the heat-insulating sleeve is coated with a heat-insulating coating.

[0017] Preferably, a guide plate is snapped onto the inner side of both the inlet pipe and the outlet pipe, and the opposite side of the guide plate is connected to the inlet pipe and the return pipe, respectively.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This application establishes a distillation group, a feed pipe, a discharge pipe, and a circulation mechanism. The distillation group is a combination of a jet evaporator and a distillation column used in the prior art for caprolactam recovery. Caprolactam feedstock can be fed into the distillation group in a fluid manner through the feed pipe for distillation. The vapor generated after distillation can be sent to the circulation tank through the discharge pipe. The caprolactam circulation and recovery structure, consisting of the circulation tank, feed valve pipe, discharge valve pipe, heat insulation cover, inner tank, cooling pipe, and distribution pipe, allows steam to flow into the circulation tank from the feed valve pipe. Inside the tank, because the steam still contains residual caprolactam, when the coolant is transferred to the inner tank through the cooling pipe and the distribution pipe, the steam will be cooled by the coolant as it flows into the inner tank and is about to be discharged from the drain valve pipe, and will condense into water droplets. The caprolactam in the water droplets will drip into the inner tank for collection, and the remaining water will gradually evaporate, ultimately retaining the caprolactam. The heat insulation cover will block the high temperature environment outside the inner tank and keep it at a low temperature. The remaining steam will flow back to the feed pipe through the drain valve pipe, realizing the recycling of caprolactam.

[0020] 2. This application, by setting up a recovery mechanism, allows the cooling components to form a heat recovery structure with the conveying components. Through the heat recovery and heat dissipation structure composed of a heat collection tube, a liquid pump, a liquid delivery pipe, heat dissipation fins, and a heat dissipation pipe, the heat collection tube utilizes the coolant within it to absorb the heat of the steam in the discharge pipe. The liquid pump then delivers the cooled liquid into the liquid delivery pipe. The coolant is cooled by the heat dissipation fins and then enters the heat dissipation pipe, transferring the final temperature to the feed pipe, thus preheating the caprolactam raw material in the feed pipe. Finally, the coolant is sent to the inlet pipe. Through the cooling structure composed of the inlet pipe, the inlet pipe, the outlet pipe, and the return pipe, the coolant is delivered to the inlet pipe via the inlet pipe. The inlet pipe then delivers the coolant to the cooling pipe and the distribution pipe, providing them with coolant. After cooling the steam, the cooling pipe and the distribution pipe reheat. The reheated coolant then flows back to the outlet pipe via the return pipe and finally back to the heat collection tube via the outlet pipe, achieving circulation. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the caprolactam recycling device based on the coupling of jet evaporation and distillation of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the circulation mechanism of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the recycling mechanism of this utility model;

[0024] Figure 4 This is a schematic diagram of the cooling component of this utility model;

[0025] Figure 5 This is a schematic diagram of the conveying assembly of this utility model.

[0026] In the diagram, 1. Distillation group; 2. Feed pipe; 3. Discharge pipe; 4. Circulation mechanism; 41. Circulation tank; 42. Feed valve pipe; 43. Drain valve pipe; 44. Heat insulation cover; 45. Inner tank; 46. Cooling pipe; 47. Diverter pipe; 48. Thermally conductive metal mesh; 49. Protective sleeve; 5. Recovery mechanism; 51. Cooling assembly; 511. Heat collection pipe; 512. Liquid pump; 513. Liquid delivery pipe; 514. Heat dissipation fins; 515. Heat dissipation pipe; 516. Sealing ring; 517. Anti-slip sleeve; 52. Conveying assembly; 521. Inlet pipe; 522. Liquid inlet pipe; 523. Outlet pipe; 524. Return pipe; 525. Insulation sleeve; 526. Guide plate. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-5 The present invention provides the following technical solution:

[0029] A caprolactam recycling and recovery device based on jet evaporation and distillation coupling includes a distillation unit 1. A feed pipe 2 is connected to the front side of the top of the distillation unit 1, and a discharge pipe 3 is connected to the bottom of the front side of the distillation unit 1. A circulation mechanism 4 is provided on the surface of both the feed pipe 2 and the discharge pipe 3. A recovery mechanism 5 is provided on the right side of the circulation mechanism 4. The circulation mechanism 4 includes a circulation tank 41, a feed valve pipe 42, a discharge valve pipe 43, a heat insulation cover 44, an inner tank 45, a cooling pipe 46, and a diversion pipe 47. Valve pipe 42 is connected to the rear side of discharge pipe 3, drain valve pipe 43 is connected to the rear side of inlet pipe 2, circulation tank 41 is connected to the bottom of drain valve pipe 43, the bottom of circulation tank 41 is connected to the top of inlet valve pipe 42, heat insulation cover 44 is connected to the front side of the inner side of circulation tank 41, inner tank 45 is connected to the inner side of heat insulation cover 44, the front side of inner tank 45 is connected to the front side of the inner side of circulation tank 41, cooling pipe 46 is provided on the surface of inner tank 45, and diversion pipe 47 is provided at the bottom of cooling pipe 46.

[0030] In this embodiment: by setting up a distillation group 1, a feed pipe 2, a discharge pipe 3, and a circulation mechanism 4, the distillation group 1 is a distillation structure combining a jet evaporator and a distillation column used in the prior art for caprolactam recovery. The caprolactam feedstock can be fed into the distillation group 1 in a fluid manner through the feed pipe 2 for distillation. The steam generated after distillation can be sent into the circulation tank 41 through the discharge pipe 3. The caprolactam circulation and recovery structure, composed of the circulation tank 41, feed valve pipe 42, discharge valve pipe 43, heat insulation cover 44, inner tank 45, cooling pipe 46, and diversion pipe 47, allows steam to flow from the feed valve pipe 42... As the steam flows into the circulation tank 41, it still contains residual caprolactam. Therefore, when the coolant is transferred to the inner tank 45 through the cooling pipe 46 and the diversion pipe 47, the steam will be cooled by the coolant and condense into water droplets as it flows into the inner tank 45 and is about to be discharged from the drain valve pipe 43. The caprolactam in the water droplets will drip into the inner tank 45 for collection, and the remaining water will gradually evaporate, ultimately retaining the caprolactam. The heat insulation cover 44 will block the high-temperature environment outside the inner tank 45, keeping it at a low temperature. The remaining steam will flow back to the feed pipe 2 through the drain valve pipe 43, realizing the recycling of caprolactam.

[0031] Specifically, such as Figure 3 As shown, the recycling mechanism 5 includes a cooling component 51 and a conveying component 52. The cooling component 51 is disposed on the surface of the feed pipe 2, and the inner side of the bottom of the cooling component 51 is disposed on the surface of the discharge pipe 3. The conveying component 52 is disposed between opposite sides of the cooling component 51, and the left side of the conveying component 52 is connected to the cooling pipe 46 and the diversion pipe 47 respectively.

[0032] Specifically, such as Figure 4 As shown, the cooling assembly 51 includes a heat collection tube 511, a liquid pump 512, a liquid delivery pipe 513, heat dissipation fins 514, and a heat dissipation tube 515. The heat collection tube 511 is sleeved on the surface of the discharge pipe 3. The liquid pump 512 is connected to the top of the heat collection tube 511. The liquid delivery pipe 513 is connected to the output end of the liquid pump 512. The heat dissipation fins 514 are bolted to the surface of the liquid delivery pipe 513. The heat dissipation tube 515 is connected to the top of the liquid delivery pipe 513. The inner side of the heat dissipation tube 515 is sleeved on the surface of the inlet pipe 2.

[0033] Specifically, such as Figure 5 As shown, the conveying assembly 52 includes an inlet pipe 521, an inlet pipe 522, an outlet pipe 523, and a return pipe 524. The inlet pipe 521 is connected to the bottom of the heat dissipation pipe 515. The inlet pipe 522 is connected to the inside of the inlet pipe 521. The left side of the inlet pipe 522 is connected to the right side of the top of the cooling pipe 46 and the right side of the top of the diversion pipe 47, respectively. The left side of the inlet pipe 521 is connected to the top of the right side of the circulation tank 41. The outlet pipe 523 is connected to the bottom of the right side of the circulation tank 41. The return pipe 524 is connected to the inside of the outlet pipe 523. The left side of the return pipe 524 is connected to the right side of the bottom of the cooling pipe 46 and the right side of the bottom of the diversion pipe 47, respectively. The front side of the outlet pipe 523 is connected to the rear side of the heat collection pipe 511.

[0034] In this embodiment: by setting up the recovery mechanism 5, the cooling component 51 can form a heat recovery structure with the conveying component 52. Through the heat recovery and heat dissipation structure composed of the heat collection pipe 511, the liquid pump 512, the liquid delivery pipe 513, the heat dissipation fins 514, and the heat dissipation pipe 515, the heat collection pipe 511 can absorb the heat of the steam in the discharge pipe 3 using the coolant in it. The liquid pump 512 sends the coolant that has absorbed the heat into the liquid delivery pipe 513. The coolant will then be cooled by the heat dissipation fins 514. After the temperature is reduced, the coolant will enter the heat dissipation pipe 515 and transfer the final temperature to the inlet pipe 2. This preheats the caprolactam raw material in the feed pipe 2. Finally, the coolant is sent to the inlet pipe 521. Through the cooling structure composed of the inlet pipe 521, the liquid inlet pipe 522, the outlet pipe 523, and the return pipe 524, the coolant can be sent to the liquid inlet pipe 522 through the inlet pipe 521. The liquid inlet pipe 522 then sends the coolant to the cooling pipe 46 and the distribution pipe 47 respectively, thus providing them with coolant. After the cooling pipe 46 and the distribution pipe 47 have cooled the steam, they will become hot again. The heated coolant will flow back to the outlet pipe 523 through the return pipe 524, and finally flow back to the heat collector pipe 511 through the outlet pipe 523 to achieve circulation.

[0035] Specifically, such as Figure 2 As shown, a heat-conducting metal mesh 48 is fitted on the surface of the inner tank 45, and the surface of the heat-conducting metal mesh 48 is in contact with the inner side of the cooling pipe 46 and the inner side of the diversion pipe 47, respectively.

[0036] Specifically, such as Figure 2 As shown, a protective sleeve 49 is fitted over the surface of the heat insulation cover 44, and the surface of the protective sleeve 49 is coated with a corrosion-resistant coating.

[0037] In this embodiment: by setting a heat-conducting metal mesh 48 and a protective sleeve 49, the heat-conducting metal mesh 48 can provide an additional temperature conduction structure for the surface of the inner tank 45, and can further stably conduct the coolant in the cooling pipe 46 and the diversion pipe 47 to various parts of the surface of the inner tank 45 through the heat-conducting metal mesh 48, thereby improving the efficiency of the inner tank 45 in cooling steam. The protective sleeve 49 can provide protection for the bottom of the heat insulation cover 44, preventing steam from directly affecting the heat insulation cover 44 when it enters from the bottom, and the corrosion-resistant coating can make it corrosion-resistant and extend its service life.

[0038] Specifically, such as Figure 4 As shown, a sealing ring 516 is fitted on the surface of the input end of the liquid pump 512, and the surface of the sealing ring 516 is engaged with the top of the heat collection tube 511.

[0039] Specifically, such as Figure 4As shown, anti-slip sleeves 517 are snapped onto the inner side of the heat collection tube 511 and the inner side of the heat dissipation tube 515. The inner side of the anti-slip sleeves 517 is snapped onto the surface of the feed tube 2 and the surface of the discharge tube 3, respectively.

[0040] In this embodiment: by setting a sealing ring 516 and an anti-slip sleeve 517, the sealing ring 516 can provide an additional sealing structure at the connection between the liquid pump 512 and the heat collection pipe 511, and can provide a seal for the connection between the heat collection pipe 511 and the liquid pump 512, further increasing the airtightness when the liquid pump 512 and the heat collection pipe 511 are connected. The anti-slip sleeve 517 can provide an additional anti-slip structure at the connection between the heat collection pipe 511 and the discharge pipe 3 and the heat dissipation pipe 515 and the inlet pipe 2, and can further increase the stability when the heat collection pipe 511 and the discharge pipe 3 and the heat dissipation pipe 515 and the inlet pipe 2 are connected.

[0041] Specifically, such as Figure 5 As shown, both the inlet pipe 522 and the return pipe 524 are covered with insulation sleeves 525, and the surface of the insulation sleeves 525 is coated with insulation paint.

[0042] Specifically, such as Figure 5 As shown, guide plates 526 are snapped onto the inner side of the inlet pipe 521 and the inner side of the outlet pipe 523. The opposite sides of the guide plates 526 are connected to the inlet pipe 522 and the return pipe 524, respectively.

[0043] In this embodiment: by setting up the insulation sleeve 525 and the guide plate 526, the insulation sleeve 525 can provide an additional insulation structure for the surface of the liquid inlet pipe 522 and the return pipe 524, thereby providing an additional insulation effect for the liquid inlet pipe 522 and the return pipe 524. Furthermore, the insulation coating can further increase the insulation performance of the insulation sleeve 525. The guide plate 526 can provide an auxiliary flow guiding structure for the connection between the inlet pipe 521 and the liquid inlet pipe 522 and the connection between the outlet pipe 523 and the return pipe 524. It can also provide auxiliary guidance for the coolant flowing from the inlet pipe 521 into the liquid inlet pipe 522 and the coolant flowing from the return pipe 524 into the outlet pipe 523, thereby increasing the stability of the coolant during flow.

[0044] Working principle: First, the inlet pipe 2 is connected to the caprolactam raw material conveying equipment, and then the outlet pipe 3 is connected to the caprolactam storage equipment. The inlet pipe 2 sends the caprolactam raw material into the distillation group 1 for distillation. The distillation group 1 then sends the distilled steam through the outlet pipe 3 into the inlet valve pipe 42. The inlet valve pipe 42 then sends the steam into the circulation tank 41. At this time, the liquid pump 512 is started. The coolant in the heat collection pipe 511 absorbs the heat of the steam in the outlet pipe 3 and carries the heat to the liquid delivery pipe 513. After the cooling fins 514 dissipate heat from the coolant in the liquid delivery pipe 513, the coolant gradually cools down. After flowing into the heat dissipation pipe 515, the remaining heat is released back into the inlet pipe 2, thereby cooling the inlet pipe. The caprolactam raw material in feed pipe 2 is preheated, and then the coolant flows into the inlet pipe 521, and then through the liquid inlet pipe 522 into the cooling pipe 46 and the distribution pipe 47. The cooling pipe 46 and the distribution pipe 47 use the coolant to cool the inner tank 45. At this time, when the steam passes through the inner tank 45, it will condense due to the low temperature of the inner tank 45, and drip into the inner tank 45 along with the caprolactam remaining in the steam. The remaining steam will flow back to the feed pipe 2 through the drain valve pipe 43. The coolant after cooling will flow into the outlet pipe 523 through the return pipe 524, and finally flow back to the heat collection pipe 511 to form a cycle. When it is necessary to remove the caprolactam, the tank door on the front of the circulation tank 41 is opened and the caprolactam is removed.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A caprolactam recycling and recovery device based on jet evaporation and distillation coupling, comprising a distillation unit (1), characterized in that: The front of the top of the distillation unit (1) is connected to an inlet pipe (2), and the bottom of the front side of the distillation unit (1) is connected to an outlet pipe (3). A circulation mechanism (4) is provided on the surface of both the inlet pipe (2) and the outlet pipe (3). A recovery mechanism (5) is provided on the right side of the circulation mechanism (4). The circulation mechanism (4) includes a circulation tank (41), an inlet valve pipe (42), a drain valve pipe (43), a heat insulation cover (44), an inner tank (45), a cooling pipe (46), and a diversion pipe (47). The inlet valve pipe (42) is connected to the rear side of the outlet pipe (3). The drain valve pipe (43) is connected to the rear side of the feed pipe (2), the circulation tank (41) is connected to the bottom of the drain valve pipe (43), the bottom of the circulation tank (41) is connected to the top of the feed valve pipe (42), the heat insulation cover (44) is connected to the front side of the inner side of the circulation tank (41), the inner tank (45) is connected to the inner side of the heat insulation cover (44), the front side of the inner tank (45) is connected to the front side of the inner side of the circulation tank (41), the cooling pipe (46) is located on the surface of the inner tank (45), and the diversion pipe (47) is located at the bottom of the cooling pipe (46).

2. The caprolactam recycling device based on jet evaporation and distillation coupling according to claim 1, characterized in that: The recycling mechanism (5) includes a cooling component (51) and a conveying component (52). The cooling component (51) is located on the surface of the feed pipe (2), and the inner side of the bottom of the cooling component (51) is located on the surface of the discharge pipe (3). The conveying component (52) is located between the opposite sides of the cooling component (51), and the left side of the conveying component (52) is connected to the cooling pipe (46) and the diversion pipe (47) respectively.

3. The caprolactam recycling device based on jet evaporation and distillation coupling according to claim 2, characterized in that: The cooling assembly (51) includes a heat collection tube (511), a liquid pump (512), a liquid delivery pipe (513), heat dissipation fins (514), and a heat dissipation pipe (515). The heat collection tube (511) is sleeved on the surface of the discharge pipe (3). The liquid pump (512) is connected to the top of the heat collection tube (511). The liquid delivery pipe (513) is connected to the output end of the liquid pump (512). The heat dissipation fins (514) are bolted to the surface of the liquid delivery pipe (513). The heat dissipation pipe (515) is connected to the top of the liquid delivery pipe (513). The inner side of the heat dissipation pipe (515) is sleeved on the surface of the feed pipe (2).

4. The caprolactam recycling device based on jet evaporation and distillation coupling according to claim 3, characterized in that: The conveying assembly (52) includes an inlet pipe (521), an inlet pipe (522), an outlet pipe (523), and a return pipe (524). The inlet pipe (521) is connected to the bottom of the heat dissipation pipe (515). The inlet pipe (522) is connected to the inside of the inlet pipe (521). The left side of the inlet pipe (522) is connected to the right side of the top of the cooling pipe (46) and the right side of the top of the diversion pipe (47). The left side of the inlet pipe (521) is connected to the top right side of the circulation tank (41). The outlet pipe (523) is connected to the bottom right side of the circulation tank (41). The return pipe (524) is connected to the inside of the outlet pipe (523). The left side of the return pipe (524) is connected to the right side of the bottom of the cooling pipe (46) and the right side of the bottom of the diversion pipe (47). The front side of the outlet pipe (523) is connected to the rear side of the heat collection pipe (511).

5. The caprolactam recycling and recovery device based on jet evaporation and distillation coupling according to claim 1, characterized in that: The surface of the inner tank (45) is covered with a heat-conducting metal mesh (48), and the surface of the heat-conducting metal mesh (48) is in contact with the inner side of the cooling pipe (46) and the inner side of the diversion pipe (47), respectively.

6. The caprolactam recycling device based on jet evaporation and distillation coupling according to claim 1, characterized in that: The surface of the heat insulation cover (44) is covered with a protective sleeve (49), and the surface of the protective sleeve (49) is coated with a corrosion-resistant coating.

7. The caprolactam recycling and recovery device based on jet evaporation and distillation coupling according to claim 3, characterized in that: A sealing ring (516) is fitted on the surface of the input end of the liquid pump (512), and the surface of the sealing ring (516) is engaged with the top of the heat collection tube (511).

8. The caprolactam recycling and recovery device based on jet evaporation and distillation coupling according to claim 3, characterized in that: Anti-slip sleeves (517) are snapped onto the inner side of the heat collection tube (511) and the inner side of the heat dissipation tube (515). The inner side of the anti-slip sleeves (517) is snapped onto the surface of the feed tube (2) and the surface of the discharge tube (3), respectively.

9. A caprolactam recycling device based on jet evaporation and distillation coupling according to claim 4, characterized in that: The surfaces of the inlet pipe (522) and the return pipe (524) are both covered with heat-insulating sleeves (525), and the surfaces of the heat-insulating sleeves (525) are coated with heat-insulating paint.

10. A caprolactam recycling device based on jet evaporation and distillation coupling according to claim 4, characterized in that: A guide plate (526) is attached to the inner side of the inlet pipe (521) and the inner side of the outlet pipe (523). The opposite side of the guide plate (526) is connected to the inlet pipe (522) and the return pipe (524) respectively.

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