A complete set of nylon 56 salted solution polymerization device

Abstract

The utility model discloses a kind of nylon 56 salted solution polymerization complete device, including the communication of fine salt storage tank, polymerization reactor, cooling water tank and granulator in sequence by pipeline, there is feeding tank in communication on polymerization reactor, there is the communication of vacuum condenser, vacuum buffer tank, vacuum pump and tail gas treatment tank in sequence on polymerization reactor, there is also the communication of gas condenser and condensate collection tank in sequence on polymerization reactor, condensate collection tank is communicated with tail gas treatment tank, fine salt storage tank is communicated with tail gas treatment tank;It also includes cold and hot integrated heat conducting oil furnace, cold and hot integrated heat conducting oil furnace and the interlayer circulation of polymerization reactor outer wall are communicated.This utility model design is reasonable, and operation maintenance is simple and easy to operate, equipment runs stably, polymerization reactor heats evenly, process fluctuation is low, stability is high, safety is high, practicality is high, solve the technical problem that the production cost of existing nylon 56 production process is high, environmental protection is poor, belong to nylon 56 production technical field.

Description

Technical Field

[0001] This utility model relates to the field of nylon 56 production technology, and more specifically, to a complete set of equipment for nylon 56 salt solution polymerization. Background Technology

[0002] Nylon (Polyamide, abbreviated as PA) is one of the most important engineering materials, widely used in clothing, vehicles, and machinery. Among them, PA6 and PA66 have the largest production volume and the most widespread applications. However, in my country's nylon production, the development of PA66 has long been limited by its high dependence on imported raw materials. To meet the needs of national defense and the market, my country has independently developed bio-based nylon 56 (PA56), officially known as polypentyl adipate diamine, which, as a new force in nylon, has entered the industrialization stage.

[0003] PA56, a bio-based material, is polymerized from bio-based pentanediamine and petroleum-based adipic acid. Bio-based pentanediamine is primarily prepared by decarboxylation of lysine. Using corn or other starch-containing materials as raw materials, starch is broken down into glucose, which is then converted to lysine through anaerobic respiration. Modified microorganisms then act on the lysine to decarboxylate it, yielding pentanediamine. The amino acid conversion efficiency can reach approximately 100%. Currently, bio-based pentanediamine has been domestically produced.

[0004] In the production process of PA56, pentanediamine and adipic acid are dissolved in an aqueous solution to form a salt, resulting in a PA56 salt solution. This solution is then subjected to a polymerization reaction under specific temperature and pressure conditions to ultimately obtain PA56. However, the PA56 salt solution contains a large amount of water. During the polymerization reaction, this water boils and evaporates violently at high temperatures, leading to significant fluctuations in pressure and liquid level within the reactor. Existing technologies typically release large amounts of water vapor directly into the air, resulting in waste and high production costs. Furthermore, the water vapor contains some raw materials, and direct release into the air causes environmental pollution, resulting in poor environmental performance. Based on these considerations, this application designs a complete set of equipment for the polymerization of nylon 56 salt solution. Utility Model Content

[0005] The purpose of this application is to provide a complete set of equipment for the salt solution polymerization of nylon 56, which aims to solve the technical problems of high production cost and poor environmental performance of existing nylon 56 production processes.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a complete set of equipment for the polymerization of nylon 56 salt solution is provided, including a refined salt storage tank, a polymerization reactor, a cooling water tank and a pelletizer connected in sequence by pipelines. A feeding tank is connected to the polymerization reactor. A vacuum condenser, a vacuum buffer tank, a vacuum pump and a tail gas treatment tank are connected in sequence to the polymerization reactor. A gas condenser and a condensate collection tank are also connected in sequence to the polymerization reactor. The condensate collection tank is connected to the tail gas treatment tank. The refined salt storage tank is connected to the tail gas treatment tank. The equipment also includes an integrated hot and cold thermal oil furnace, which is circulated in a jacket on the outer wall of the polymerization reactor.

[0007] In one embodiment, a heating and insulation sleeve and a temperature display controller are provided on the outer wall of the refined salt storage tank and on the pipeline between the refined salt storage tank and the polymerization reactor, and the heating and insulation sleeve and the temperature display controller are electrically connected.

[0008] In one embodiment, a heating and insulation sleeve is provided on the pipeline between the integrated heating and cooling thermal oil furnace and the polymerization reactor, and a temperature display controller is provided on the polymerization reactor. The heating and insulation sleeve and the temperature display controller are electrically connected.

[0009] In one embodiment, a flow meter and a pneumatic feed valve are provided on the pipeline between the refined salt storage tank and the polymerization reactor, and the flow meter and the pneumatic feed valve are electrically connected.

[0010] In one embodiment, the polymerization reactor is equipped with a pressure transmitter, and pneumatic relief valves are provided on the pipelines between the polymerization reactor and the vacuum condenser and the gas condenser. The pressure transmitter is electrically connected to the pneumatic relief valves.

[0011] In one embodiment, a pneumatic switch valve is provided at the bottom of the polymerization reactor, and a casting strip head is connected to the pneumatic switch valve. The casting strip head is connected to the cooling water tank. The integrated hot and cold thermal oil furnace is circulatedly connected to the pneumatic switch valve and the heat exchange tube on the casting strip head. Heating and heat insulation sleeves are provided on the pipelines between the integrated hot and cold thermal oil furnace, the pneumatic switch valve, and the casting strip head. It also includes a compressed air storage tank, which is connected to the pneumatic feed valve, the pneumatic vent valve, and the pneumatic switch valve.

[0012] In one embodiment, cooling water is circulated in the heat exchange tubes of the cooling water tank, and demineralized water is also circulated in the cooling water tank.

[0013] In one embodiment, the refined salt storage tank, the tail gas treatment tank, and the condensate collection tank are all equipped with level gauges.

[0014] In one embodiment, an oil station is also included, which is in cyclic communication with the stirring assembly inside the polymerization reactor.

[0015] In one embodiment, an inert gas storage tank is also included, which is connected to the refined salt storage tank, the polymerization reactor, and the feeding tank.

[0016] This invention provides a complete set of equipment for the polymerization of nylon 56 in a salt solution. Compared with the prior art, its advantages are as follows: A vacuum condenser is used to condense the large amount of water vapor in the polymerization reaction, which is then discharged through a vacuum buffer tank for recycling, avoiding the waste caused by the direct release of large amounts of water vapor into the air and reducing production costs. A gas condenser is used to condense and recover volatile monomers and oligomers entrained during inert gas purging, which are then discharged through a condensate collection tank for recycling, reducing raw material loss, production costs, and environmental pollution. A tail gas treatment tank is used to combine the non-condensable vapors from the refined salt storage tank, vacuum buffer tank, and condensate collection tank before they enter the tail gas treatment tank for unified treatment, further reducing environmental pollution. This invention has a simple structure, reasonable design, and is easy to operate and maintain. The equipment operates stably, the polymerization reactor is heated evenly, and the process (temperature, pressure, liquid level) fluctuations are low, resulting in high stability, high safety, and high practicality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a complete set of apparatus for the salt solution polymerization of nylon 56 according to an embodiment of this application; Figure 2 for Figure 1 The diagram shows an enlarged view of the refined salt storage tank and polymerization reactor in the complete set of equipment for the salt solution polymerization of nylon 56. Figure 3 for Figure 1 The diagram shows an enlarged view of the polymerization reactor and the integrated hot and cold thermal oil furnace in the complete set of equipment for the salt solution polymerization of nylon 56. Figure 4 for Figure 1 The diagram shows an enlarged view of the vacuum buffer tank, tail gas treatment tank, and condensate collection tank in the complete set of equipment for the polymerization of nylon 56 in salt solution.

[0019] Explanation of symbols in the diagram: 1. Refined salt storage tank; 2. Polymerization reactor; 3. Cooling water tank; 4. Pelletizer; 5. Feeding tank; 6. Vacuum condenser; 7. Vacuum buffer tank; 8. Vacuum pump; 9. Tail gas treatment tank; 10. Gas condenser; 11. Condensate collection tank; 12. Integrated heating and cooling thermal oil heater; 13. Heating and insulation jacket; 14. Temperature display controller; 15. Flow meter; 16. Pneumatic feed valve; 17. Pressure transmitter; 18. Pneumatic relief valve; 19. Compressed air storage tank; 20. Pneumatic switch valve; 21. Casting strip head; 22. Liquid level gauge; 23. Oil station; 24. Inert gas storage tank; 25. Cooling water; 26. Demineralized water; 27. Discharge valve; 28. Exhaust valve. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed" or "set" to another component, it can be directly on or indirectly on the other component. When a component is referred to as being "connected" to another component, it can be directly connected to or indirectly connected to the other component.

[0022] It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and should not be construed as indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Please see Figure 1 This is a schematic diagram of a complete set of apparatus for the salt solution polymerization of nylon 56 according to an embodiment of this application. For ease of explanation, only the parts relevant to this embodiment are shown, which are described in detail below: In one embodiment, please refer to Figures 2-3A complete set of equipment for the polymerization of nylon 56 into a salt solution includes a refined salt storage tank 1, a polymerization reactor 2, a cooling water tank 3, and a pelletizer 4 connected in sequence by pipelines. A feeding tank 5 is connected to the polymerization reactor 2. A vacuum condenser 6, a vacuum buffer tank 7, a vacuum pump 8, and a tail gas treatment tank 9 are connected in sequence to the polymerization reactor 2. A gas condenser 10 and a condensate collection tank 11 are also connected in sequence to the polymerization reactor 2. The condensate collection tank 11 is connected to the tail gas treatment tank 9, and the refined salt storage tank 1 is connected to the tail gas treatment tank 9. The equipment also includes a heat transfer oil heater 12 with integrated heating and cooling, which is circulated in a jacket on the outer wall of the polymerization reactor 2.

[0024] The refined salt storage tank 1 stores PA56 salting solution, which undergoes polymerization reaction in the polymerization reactor 2 to generate PA56; the feeding tank 5 stores additives. In this embodiment, the additive is titanium dioxide (TiO2), which acts as a matting agent and functional modifier, giving the PA56 product high crystallinity and a smooth surface. In operation, the PA56 salt solution in the refined salt storage tank 1 enters the polymerization reactor 2, and the additives in the feeding tank 5 enter the polymerization reactor 2. The polymerization reaction takes place in the polymerization reactor 2 to obtain PA56 melt. After the PA56 melt is cooled by the cooling water tank 3, it is drawn into the pelletizer 4 for pelletizing, and finally PA56 chips are obtained. A large amount of water vapor generated in the polymerization reactor 2 enters the vacuum condenser 6 for condensation and is discharged through the vacuum buffer tank 7 for recycling. The volatile monomers and oligomers carried by the inert gas when purging the polymerization reactor 2 enter the gas condenser 10 for condensation and are discharged through the condensate collection tank 11 for recycling. The non-condensable vapors in the refined salt storage tank 1, vacuum buffer tank 7 and condensate collection tank 11 are combined and enter the tail gas treatment tank 9 for unified treatment.

[0025] By setting up a vacuum condenser 6 to condense the large amount of water vapor in the polymerization reaction and discharge it through a vacuum buffer tank 7 for recycling, a large amount of water vapor is avoided from being directly emitted into the air, thus reducing waste and production costs. By setting up a gas condenser 10 to condense and recover volatile monomers and oligomers entrained during inert gas purging and discharge them through a condensate collection tank 11 for recycling, raw material loss is reduced, production costs are lowered, and environmental pollution is reduced. By setting up a tail gas treatment tank 9, the non-condensable vapors in the refined salt storage tank 1, vacuum buffer tank 7, and condensate collection tank 11 are combined and enter the tail gas treatment tank 9 for unified treatment, thus reducing environmental pollution.

[0026] For details, please refer to Figure 4 The bottom of the vacuum buffer tank 7, the condensate collection tank 11, and the exhaust gas treatment tank 9 are all equipped with exhaust valves 27, and the top of the exhaust gas treatment tank 9 is also equipped with an exhaust valve 28.

[0027] In one embodiment, please refer to Figure 2 Heating and insulation sleeves 13 and temperature display controllers 14 are installed on the outer wall of the refined salt storage tank 1 and on the pipeline between the refined salt storage tank 1 and the polymerization reactor 2. The heating and insulation sleeves 13 and the temperature display controllers 14 are electrically connected. The heating and insulation sleeves 13 and the temperature display controllers 14 are interlocked to ensure that crystallization does not occur inside the refined salt storage tank 1 or in the pipeline between the refined salt storage tank 1 and the polymerization reactor 2, thus avoiding blockage of the pipelines and equipment.

[0028] In one embodiment, please refer to Figure 3 A heating and insulation jacket 13 is installed on the pipeline between the integrated heating and cooling oil heater 12 and the polymerization reactor 2. A temperature display controller 14 is installed on the polymerization reactor 2. The heating and insulation jacket 13 and the temperature display controller 14 are electrically connected. The heating and insulation jacket 13 and the temperature display controller 14 are interlocked to ensure precise temperature control during the polymerization process.

[0029] In one embodiment, please refer to Figures 2-3 A flow meter 15 and a pneumatic feed valve 16 are installed on the pipeline between the refined salt storage tank 1 and the polymerization reactor 2. The flow meter 15 and the pneumatic feed valve 16 are electrically connected. The flow meter 15 is used to control the feed rate of the PA56 salt formation solution. The flow meter 15 is interlocked with the pneumatic feed valve 16. When the set feed rate is reached, the pneumatic feed valve 16 automatically closes, accurately controlling the volume of the PA56 salt formation solution to be polymerized.

[0030] In one embodiment, please refer to Figures 2-3 The polymerization reactor 2 is equipped with a pressure transmitter 17. Pneumatic relief valves 18 are installed on the pipelines connecting the polymerization reactor 2 to the vacuum condenser 6 and the gas condenser 10. The pressure transmitter 17 is electrically connected to the pneumatic relief valves 18. The pressure transmitter 17 and the pneumatic relief valves 18 are interlocked to achieve automatic control of the pressure inside the polymerization reactor 2.

[0031] In one embodiment, please refer to Figures 2-3 A pneumatic switch valve 20 is installed at the bottom of the polymerization reactor 2, and a casting head 21 is connected to the pneumatic switch valve 20. The casting head 21 is connected to the cooling water tank 3. The integrated hot and cold thermal oil furnace 12 is circulated with the heat exchange tubes on the pneumatic switch valve 20 and the casting head 21. Heating and heat insulation sleeves 13 are installed on the pipelines between the integrated hot and cold thermal oil furnace 12, the pneumatic switch valve 20, and the casting head 21. The integrated hot and cold thermal oil furnace 12 and the heating and heat insulation sleeves 13 are used together to prevent the PA56 melt from condensing and causing blockage at the pneumatic switch valve 20 and the casting head 21 due to temperature drop.

[0032] In one embodiment, please refer to Figures 2-3It also includes a compressed air storage tank 19, which is connected to a pneumatic feed valve 16, a pneumatic relief valve 18, and a pneumatic switching valve 20. The opening and closing of the pneumatic feed valve 16, the pneumatic relief valve 18, and the pneumatic switching valve 20 are controlled by the compressed air in the compressed air storage tank 19.

[0033] In one embodiment, please refer to Figure 2 Cooling water 25 circulates within the heat exchange tubes of cooling water tank 3, and demineralized water 26 is also connected within the cooling water tank 3. The demineralized water 26 serves as a cooling medium to cool the PA56 molten wire flowing from the casting head 21. Cooling water 25 is used to cool the demineralized water 26. Cooling water tank 3 is also equipped with a temperature display controller 14, which works in conjunction with the cooling water 25 to maintain a controllable temperature within the cooling water tank 3.

[0034] In one embodiment, please refer to Figure 2 and Figure 4 Each of the refined salt storage tank 1, the tail gas treatment tank 9, and the condensate collection tank 11 is equipped with a level gauge 22 to monitor the liquid level in the tank and prevent overflow or insufficient solution from causing the polymerization reaction to fail.

[0035] In one embodiment, please refer to Figures 2-3 It also includes an oil station 23, which is in cyclic connection with the stirring assembly in the polymerization reactor 2. The oil station 23 mainly serves to lubricate and cool the stirring assembly.

[0036] In one embodiment, please refer to Figures 1-2 It also includes an inert gas storage tank 24, which is connected to the refined salt storage tank 1, the polymerization reactor 2, and the feeding tank 5. The inert gas storage tank 24 stores inert gas, which is used to inertize the refined salt storage tank 1, the polymerization reactor 2, and the feeding tank 5 to ensure the safety of the polymerization reaction; in this embodiment, nitrogen is selected as the inert gas.

[0037] The following combination Figures 1-4 The working process of a complete set of apparatus for the salt solution polymerization of nylon 56 according to this application is described as follows: First, a PA56 salting solution with a content of 50-55% is added to the refined salt storage tank 1. The heating and insulation sleeve 13 on the pipeline between the refined salt storage tank 1 and the polymerization reactor 2 is opened to prevent the PA56 salting solution from crystallizing. The inert gas storage tank 24 is opened, and nitrogen gas is introduced into the refined salt storage tank 1 for protection. The PA56 salting solution is then pressed into the polymerization reactor 2 by nitrogen gas. During the pressing process, the feed amount of the PA56 salting solution is quantitatively measured by the flow meter 15. Nitrogen gas is introduced into polymerization reactor 2 to replace the air. The pneumatic vent valve 18 is opened, and the nitrogen valve is slightly opened to allow a small amount of nitrogen gas to flow into polymerization reactor 2. The polymerization reactor 2 is started, the stirring component speed is set to 30 revolutions, the material temperature is set to 122°C, and the hot oil temperature in the integrated hot and cold thermal oil furnace 12 is set to 170°C. The PA56 salt solution with a content of 50-55% is concentrated until the concentration is concentrated to 70%. The pneumatic vent valve 18 and the nitrogen valve are then closed. In the polymerization reactor 2, the temperature and pressure are increased in a closed system. The material temperature is set at 225℃, and the hot oil temperature is gradually increased, with a maximum setting of 280℃, until the material temperature reaches 225℃ and the pressure reaches approximately 1.8-2.2 MPa. The temperature and pressure are maintained at this point for 10 minutes. The material temperature is then changed to 270℃, and the hot oil temperature is set to 300℃. The pressure inside the polymerization reactor 2 is adjusted using the pneumatic relief valve 18 to begin depressurization, starting from 2.2 MPa and gradually decreasing to 2.0 MPa, 1.8 MPa, 1.6 MPa, 1.4 MPa, 1.2 MPa, 1.0 MPa, 0.8 MPa, 0.6 MPa, 0.4 MPa, 0.2 MPa, and finally 0 MPa. Simultaneously, the material temperature is gradually increased. When the pressure drops to 0 MPa, the material temperature is gradually increased to no less than 245℃. When the pressure is reduced to 0.5 MPa, the temperature at the casting head 21 is set to 270℃, and the heating begins. When the pressure reaches 0 MPa, the vacuum pump 8 is turned on to evacuate the vacuum and stabilize the pressure at -0.06 MPa. Vacuum negative pressure polymerization begins, and the viscosity of the PA56 melt is determined to meet the requirements based on the stirring current. Turn off vacuum pump 8, stop stirring, confirm that the material temperature in polymerization reactor 2 is 270℃, confirm that the temperature of casting head 21 has reached 270℃, and confirm that cooling water tank 3 and pelletizer 4 are fully prepared; open inert gas storage tank 24 again, introduce nitrogen into polymerization reactor 2 until the pressure is about 0.2MPa, open pneumatic switch valve 20 at the bottom of polymerization reactor 2, and after PA56 melt filaments flow out from casting head 21, increase the pressure in polymerization reactor 2 to about 0.5MPa according to the discharge situation; after the PA56 melt filaments are cooled by cooling water tank 3, they are drawn into pelletizer 4 for pelletizing, and the pelletizing speed of pelletizer 4 is adjusted according to the discharge situation to finally obtain PA56 chips.

[0038] In summary, this invention provides a complete set of equipment for the salt-forming solution polymerization of nylon 56. By incorporating a vacuum condenser, the large amount of water vapor generated during the polymerization reaction is condensed and discharged through a vacuum buffer tank for recycling, avoiding the waste caused by direct emission of large amounts of water vapor into the air and reducing production costs. Furthermore, by incorporating a gas condenser, volatile monomers and oligomers entrained during inert gas purging are condensed and recovered, discharged through a condensate collection tank for recycling, reducing raw material loss, production costs, and environmental pollution. Finally, by incorporating a tail gas treatment tank, non-condensable vapors from the refined salt storage tank, vacuum buffer tank, and condensate collection tank are combined and treated uniformly, further reducing environmental pollution. This invention features a simple structure, reasonable design, easy operation and maintenance, stable equipment operation, uniform heating of the polymerization reactor, low fluctuations in process parameters (temperature, pressure, liquid level), high stability, high safety, and high practicality. This invention has wide applications in the field of nylon 56 production technology.

[0039] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A complete set of equipment for the polymerization of nylon 56 into a salt solution, comprising a refined salt storage tank (1), a polymerization reactor (2), a cooling water tank (3), and a pelletizer (4) connected sequentially by pipelines, wherein a feeding tank (5) is connected to the polymerization reactor (2), characterized in that, The polymerization reactor (2) is connected in sequence to a vacuum condenser (6), a vacuum buffer tank (7), a vacuum pump (8), and a tail gas treatment tank (9). The polymerization reactor (2) is also connected in sequence to a gas condenser (10) and a condensate collection tank (11). The condensate collection tank (11) is connected to the tail gas treatment tank (9), and the refined salt storage tank (1) is connected to the tail gas treatment tank (9). The reactor also includes a heat transfer oil heater (12) that is integrated with the cooling and heating system. The heat transfer oil heater (12) is connected to the jacket on the outer wall of the polymerization reactor (2) in a circulating manner.

2. The complete set of equipment for salt solution polymerization of nylon 56 as described in claim 1, characterized in that, Heating and insulation sleeves (13) and temperature display controllers (14) are provided on the outer wall of the refined salt storage tank (1) and on the pipeline between the refined salt storage tank (1) and the polymerization reactor (2). The heating and insulation sleeves (13) and the temperature display controllers (14) are electrically connected.

3. The complete set of equipment for salt solution polymerization of nylon 56 as described in claim 1, characterized in that, A heating and heat-conducting oil furnace (12) is provided with a heating and heat-insulating sleeve (13) on the pipeline between the heating and heat-conducting oil furnace (12) and the polymerization reactor (2). A temperature display controller (14) is provided on the polymerization reactor (2). The heating and heat-insulating sleeve (13) and the temperature display controller (14) are electrically connected.

4. The complete set of equipment for salt solution polymerization of nylon 56 as described in claim 1, characterized in that, A flow meter (15) and a pneumatic feed valve (16) are installed on the pipeline between the refined salt storage tank (1) and the polymerization reactor (2), and the flow meter (15) and the pneumatic feed valve (16) are electrically connected.

5. The complete set of equipment for salt solution polymerization of nylon 56 as described in claim 4, characterized in that, The polymerization reactor (2) is equipped with a pressure transmitter (17), and pneumatic relief valves (18) are provided on the pipelines between the polymerization reactor (2) and the vacuum condenser (6) and the gas condenser (10). The pressure transmitter (17) and the pneumatic relief valve (18) are electrically connected.

6. The complete set of apparatus for salt solution polymerization of nylon 56 as described in claim 5, characterized in that, The bottom of the polymerization reactor (2) is provided with a pneumatic switch valve (20), and a casting head (21) is connected to the pneumatic switch valve (20). The casting head (21) is connected to the cooling water tank (3). The integrated hot and cold thermal oil furnace (12) is circulatedly connected to the heat exchange tubes on the pneumatic switch valve (20) and the casting head (21). Heating and heat insulation sleeves (13) are provided on the pipelines between the integrated hot and cold thermal oil furnace (12), the pneumatic switch valve (20), and the casting head (21). It also includes a compressed air storage tank (19), which is connected to the pneumatic feed valve (16), the pneumatic vent valve (18), and the pneumatic switch valve (20).

7. The complete set of equipment for salt solution polymerization of nylon 56 as described in claim 1, characterized in that, Cooling water (25) is circulated in the heat exchange tube of the cooling water tank (3), and demineralized water (26) is connected in the cooling water tank (3).

8. The complete set of equipment for salt solution polymerization of nylon 56 as described in claim 1, characterized in that, The refined salt storage tank (1), the tail gas treatment tank (9), and the condensate collection tank (11) are all equipped with level gauges (22).

9. The complete set of equipment for salt solution polymerization of nylon 56 as described in claim 1, characterized in that, It also includes an oil station (23), which is in cyclic connection with the stirring assembly in the polymerization reactor (2).

10. The complete set of apparatus for salt solution polymerization of nylon 56 as described in claim 1, characterized in that, It also includes an inert gas storage tank (24), which is connected to the refined salt storage tank (1), the polymerization reactor (2), and the feeding tank (5).

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