Regulation and control device for improving mixing efficiency of polyamide 6 prepolymerization auxiliary agent

Abstract

The utility model provides a regulation and control device for improving the mixing efficiency of a polyamide 6 prepolymerization auxiliary agent, which comprises a phthalic acid regulation and control system, a piperidylamine regulation and control system, a titanium dioxide regulation and control system and a caprolactam regulation and control system, and the terephthalic acid regulation and control system, the piperidylamine regulation and control system and the titanium dioxide regulation and control system respectively comprise a regulation mechanism. The three adjusting mechanisms are all communicated with the dynamic mixer, and a second heat exchanger and a second static mixer are arranged between the terephthalic acid adjusting and controlling system and the piperidylamine adjusting and controlling system. The whole structure can reasonably regulate and control multiple auxiliaries, the feeding speed and amount of the multiple auxiliaries can be regulated and controlled, it is ensured that mixing is conducted according to a preset formula, and the feeding amount, the discharging amount and the pressure of the multiple auxiliaries are regulated and controlled and monitored on line through all devices of the regulating mechanism. And the mixing efficiency is high, the automation degree is high, a corresponding amount of raw materials can be automatically fed according to requirements, the working efficiency is greatly improved, and the large popularization value is achieved.

Description

Technical Field

[0001] This utility model relates to the field of polyamide 6 extraction, and in particular to a control device for improving the mixing efficiency of polyamide 6 prepolymerization aids. Background Technology

[0002] Polyamide 6 (PA6), also known as nylon 6, is an aliphatic polyamide with excellent properties such as light weight, high strength, wear resistance, resistance to weak acids and alkalis and some organic solvents, and ease of molding and processing. The extraction process involves the diffusion of extractables (monomers and oligomers) into the aqueous phase, employing desalination and degassing countercurrent extraction. The extraction of polyamide 6 requires the addition of terephthalic acid, pyridinium chloride, titanium dioxide, and caprolactam. These additives participate in the polymerization reaction, regulating molecular structure, improving thermal stability, enhancing mechanical properties, and contributing to increased production efficiency and product quality. However, most existing polyamide 6 prepolymers suffer from low mixing efficiency and low automation, failing to automatically add the required amounts of raw materials, thus reducing work efficiency. Therefore, we propose a control device to improve the mixing efficiency of polyamide 6 prepolymer additives to address these issues. Utility Model Content

[0003] This invention provides a control device for improving the mixing efficiency of polyamide 6 prepolymer additives, which solves the problem that most existing polyamide 6 prepolymers have low mixing efficiency, low automation, and cannot automatically add the corresponding amount of raw materials as required, thus reducing work efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a control device for improving the mixing efficiency of polyamide 6 prepolymer additives, including a terephthalic acid control system, a pyridinamide control system, a titanium dioxide control system and a caprolactam control system. The terephthalic acid control system, the pyridinamide control system and the titanium dioxide control system all include adjustment mechanisms. All three adjustment mechanisms are connected to a dynamic mixer. A second heat exchanger and a second static mixer are provided between the terephthalic acid control system and the pyridinamide control system.

[0005] In a preferred embodiment, the terephthalic acid control system includes a first mixing tank, on which terephthalic acid is connected, and a water seal tank is connected to one side of the first mixing tank. The water seal tank is connected to a second heat exchanger, and the first mixing tank is connected to a first caprolactam.

[0006] In a preferred embodiment, the second heat exchanger is connected to the first static mixer, the first static mixer is connected to the first heat exchanger, the first heat exchanger is connected to the prepolymer reactor, and the second static mixer is connected to the dynamic mixer.

[0007] In a preferred embodiment, the pyridinium control system includes a second mixing tank, on which pyridinium is connected, and on one side of the second mixing tank is a second water seal tank connected.

[0008] The second water seal tank is connected to the tank storing demineralized water.

[0009] In a preferred embodiment, the titanium dioxide control system includes a third mixing tank, which is equipped with a connected titanium dioxide container.

[0010] The third batching tank is connected to the tank storing demineralized water, and the third batching tank is also connected to the tank storing caprolactam.

[0011] In a preferred embodiment, the caprolactam control system includes a second caprolactam, which is connected to a heater. A flow meter is provided on one side of the heater, and the heater is connected to a dynamic mixer.

[0012] The caprolactam is connected to the tank storing the desalinated water.

[0013] In a preferred embodiment, the regulating mechanism includes a storage tank, which is connected to the batching tank via a first pump, connected to the batching tank via a gas valve, and connected to the dynamic mixer via a second pump.

[0014] In the preferred embodiment, a first valve is provided on one side of the first pump, and a filter is provided on one side of the first valve, with the filter connected to the storage tank.

[0015] In the preferred embodiment, a flow valve is provided on one side of the second pump and a second flow valve is provided on one side of the storage tank. One end of the second flow valve is connected to the storage tank, and the other end of the second flow valve is connected to the pipeline between the second pump and the flow valve.

[0016] The beneficial effects of this utility model are as follows: liquid pyridinium is stored in the second feed tank, the second feed tank is placed on the second mixing tank, liquid pyridinium and demineralized water are added to the second mixing tank, the pyridinium and demineralized water are stirred and mixed in the second mixing tank, and the stirred and mixed liquid enters the regulating mechanism of the system, and the regulating mechanism sequentially transports the liquid to the dynamic mixer.

[0017] Solid titanium dioxide is stored in a third feed tank, which is placed on top of a third mixing tank. Titanium dioxide, caprolactam, and demineralized water are added to the third mixing tank. The titanium dioxide, caprolactam, and demineralized water are stirred and mixed in the third mixing tank. The mixed liquid enters the regulating mechanism of the system, which sequentially transports the liquid to the dynamic mixer.

[0018] The second caprolactam is stored in the fourth feed tank. Demineralized water and liquid caprolactam enter the dynamic mixer. Terephthalic acid, pyridinamide, titanium dioxide, and the second caprolactam are mixed in the dynamic mixer. The first and second heat exchangers regulate the temperature of the terephthalic acid and pyridinamide control systems, monitoring the system temperature in real time. Flow valves and the second flow valve adjust the discharge rate and quantity to the dynamic mixer in real time, ensuring mixing according to the preset formula. Gas valves regulate the gas flow rate and pressure of the system in real time. The first valve and filter regulate the feed rate of materials into the storage tank in real time. All three systems include regulating mechanisms to allow online control and monitoring of the feed rate, discharge rate, temperature, and pressure of terephthalic acid, pyridinamide, and titanium dioxide. The mixing tanks of the first three systems are equipped with stirring devices to adjust and control the stirring speed of the three additives.

[0019] The caprolactam control system's heater provides real-time regulation and monitoring of the dynamic mixer, while the flow meter monitors the mixed liquid entering the dynamic mixer. The overall structure allows for the rational regulation of various additives, controlling their feed rate and quantity to ensure proper mixing according to the preset formula. Multiple stirring mechanisms adjust and control the additive stirring speed. The first and second heat exchangers and the heater control the temperature of multiple systems and the dynamic mixer for more precise temperature control. Various devices in the regulation mechanism enable online control and monitoring of the feed rate, discharge rate, and pressure of various additives. The system boasts high mixing efficiency and a high degree of automation, automatically adding the required amount of raw materials as needed, significantly improving work efficiency and possessing considerable potential for widespread application. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a flowchart illustrating the overall structure of this utility model;

[0022] Figure 2 This is a flowchart illustrating the adjustment mechanism of this utility model;

[0023] Figure 3 This is a schematic diagram of the titanium dioxide control system of this utility model;

[0024] Figure 4 This is a schematic diagram of the caprolactam regulation system of this utility model;

[0025] In the diagram: 1. Terephthalic acid control system; 101. First batching tank; 102. Terephthalic acid; 103. Water seal tank; 2. Piperidine control system; 201. Second batching tank; 202. Piperidine; 203. Second water seal tank; 3. Titanium dioxide control system; 301. Third batching tank; 302. Titanium dioxide; 303. Caprolactam; 4. Caprolactam control system; 401. Second caprolactam; 402. Flow meter; 403. Heater; 5. Adjustment mechanism; 501. Storage tank; 502. First pump; 503. First valve; 504. Filter; 505. Gas valve; 506. Second pump; 507. Flow valve; 508. Second flow valve; 6. Prepolymer reactor; 7. First heat exchanger; 8. First static mixer; 9. Second static mixer; 10. Dynamic mixer; 11. Detailed Implementation

[0026] Example 1:

[0027] like Figure 1-4 A regulating device for improving the mixing efficiency of polyamide 6 prepolymer additives includes a terephthalic acid regulating system 1, a pyridinamide regulating system 2, a titanium dioxide regulating system 3, and a caprolactam regulating system 4. Each of the terephthalic acid regulating system 1, pyridinamide regulating system 2, and titanium dioxide regulating system 3 includes a regulating mechanism 5. All three regulating mechanisms 5 are connected to a dynamic mixer 11. A second heat exchanger 9 and a second static mixer 10 are provided between the terephthalic acid regulating system 1 and the pyridinamide regulating system 2. In this structure, solid terephthalic acid 102 is stored in a feed tank, which is placed on a first mixing tank 101. Solid terephthalic acid 102 and caprolactam are added to the first mixing tank 101, and the terephthalic acid 102 and caprolactam are stirred and mixed in the first mixing tank 101. The mixed liquid enters the regulating mechanism 5 of the system, and the regulating mechanism 5 sequentially delivers the liquid to the second heat exchanger 9, the second static mixer 10, and the dynamic mixer 11.

[0028] Liquid pyridinium 202 is stored in a second feed tank, which is placed on top of a second mixing tank 201. Liquid pyridinium 202 and demineralized water are added to the second mixing tank 201. The pyridinium 202 and demineralized water are stirred and mixed in the second mixing tank 201. The stirred and mixed liquid enters the regulating mechanism 5 of the system. The regulating mechanism 5 sequentially transports the liquid to the dynamic mixer 11.

[0029] Solid titanium dioxide 302 is stored in a third feed tank, which is placed on top of a third batching tank 301. Titanium dioxide 302, caprolactam 303, and demineralized water are added to the third batching tank 301. The titanium dioxide 302, caprolactam 303, and demineralized water are stirred and mixed in the third batching tank 301. The mixed liquid enters the regulating mechanism 5 of the system, and the regulating mechanism 5 sequentially transports the liquid to the dynamic mixer 11.

[0030] The second caprolactam 401 is stored in the fourth feed tank. The demineralized water and liquid caprolactam 401 enter the dynamic mixer 11. Terephthalic acid 102, pyridinamide 202, titanium dioxide 302, and the second caprolactam 401, along with other additives, are mixed in the dynamic mixer 11. The first heat exchanger 7 and the second heat exchanger 9 regulate the temperature of the terephthalic acid control system 1 and the pyridinamide control system 2, monitoring the system temperature in real time. Flow valves 507 and 508 adjust the discharge rate and quantity to the dynamic mixer 11 in real time to ensure mixing according to the preset formula. Gas valve 505 regulates the gas flow rate and pressure of the system in real time. The first valve 503 and the filter 504 regulate the feed rate of materials into the storage tank 501 in real time. The first three systems all include a regulating mechanism 5 to enable online regulation and monitoring of the feed rate, discharge rate, temperature, and pressure of terephthalic acid 102, pyridinamide 202, and titanium dioxide 302. The mixing tanks of the first three systems are all equipped with stirring devices to regulate and control the stirring speed of the three additives.

[0031] The heater 403 of the caprolactam control system 4 provides real-time control and monitoring of the mixture in the dynamic mixer 11. The flow meter 402 monitors the mixed liquid entering the dynamic mixer 11 from the caprolactam control system 4. The overall structure allows for reasonable control of various additives, including their feed rate and quantity, ensuring proper mixing according to the preset formula. Multiple stirring mechanisms can adjust and control the stirring speed of the additives. The first heat exchanger 7, the second heat exchanger 9, and the heater 403 control the temperature of multiple systems and the dynamic mixer 11 for more precise temperature control. The various devices in the regulating mechanism 5 provide online control and monitoring of the feed rate, discharge rate, and pressure of various additives. The system boasts high mixing efficiency and a high degree of automation, automatically adding the required amount of raw materials as needed, significantly improving work efficiency.

[0032] In a preferred embodiment, the terephthalic acid control system 1 includes a first mixing tank 101, on which terephthalic acid 102 is connected. A water seal tank 103 is connected to one side of the first mixing tank 101, and the water seal tank 103 is connected to a second heat exchanger 9. The first mixing tank 101 is connected to a first caprolactam 104. With this structure, solid terephthalic acid 102 is stored in a feed tank placed on the first mixing tank 101. Solid terephthalic acid 102 and caprolactam are added to the first mixing tank 101, and the terephthalic acid 102 and caprolactam are stirred and mixed in the first mixing tank 101. The mixed liquid then enters the system's regulating mechanism 5, which sequentially delivers the liquid to the second heat exchanger 9, the second static mixer 10, and the dynamic mixer 11.

[0033] In a preferred embodiment, the second heat exchanger 9 is connected to a first static mixer 8, which in turn is connected to a first heat exchanger 7. The first heat exchanger 7 is connected to a prepolymer reactor 6, and the second static mixer 10 is connected to a dynamic mixer 11. With this structure, the prepolymer reactor 6 provides the initial reaction site for the polymerization reaction. In the reactor, caprolactam monomers begin a ring-opening polymerization reaction under the action of initiators, catalysts, etc., forming a low-molecular-weight polyamide 6 prepolymer. The prepolymer reactor 6 is equipped with a stirring device to ensure thorough and uniform mixing of caprolactam monomers, initiators, catalysts, and other additives. The first heat exchanger 7 controls the reaction temperature to increase the reaction rate, enabling the polymerization reaction to proceed quickly and efficiently. Simultaneously, the first heat exchanger 7 recovers heat, which can be transferred to other materials requiring heating, improving energy efficiency and reducing production costs.

[0034] In a preferred embodiment, the pyridinium control system 2 includes a second mixing tank 201, on which a pyridinium 202 is connected, and on one side of the second mixing tank 201, a second water seal tank 203 is connected.

[0035] The second water seal tank 203 is connected to the tank for storing demineralized water. With this structure, liquid pyridinium 202 is stored in the second feed tank, which is placed on top of the second mixing tank 201. Liquid pyridinium 202 and demineralized water are added to the second mixing tank 201. The pyridinium 202 and demineralized water are stirred and mixed in the second mixing tank 201. The mixed liquid then enters the regulating mechanism 5 of the system, which sequentially transports the liquid to the dynamic mixer 11.

[0036] In a preferred embodiment, the titanium dioxide control system 3 includes a third mixing tank 301, and the third mixing tank 301 is provided with a connected titanium dioxide 302.

[0037] The third batching tank 301 is connected to the tank storing demineralized water and the tank storing caprolactam 303. In this structure, solid titanium dioxide 302 is stored in the third feed tank, which is placed on top of the third batching tank 301. Titanium dioxide 302, caprolactam 303, and demineralized water are added to the third batching tank 301. The titanium dioxide 302, caprolactam 303, and demineralized water are stirred and mixed in the third batching tank 301. The resulting liquid enters the regulating mechanism 5 of the system, which sequentially transports the liquid to the dynamic mixer 11.

[0038] In a preferred embodiment, the caprolactam control system 4 includes a second caprolactam 401, which is connected to a heater 403. A flow meter 402 is provided on one side of the heater 403, and the heater 403 is connected to the dynamic mixer 11.

[0039] Caprolactam 401 is connected to the tank storing demineralized water. With this structure, the heater 403 of the caprolactam control system 4 provides real-time control and monitoring of the dynamic mixer 11, and the flow meter 402 monitors the mixed liquid entering the dynamic mixer 11 from the caprolactam control system 4. The overall structure can rationally control various additives, regulate the feeding speed and amount of various additives, and ensure mixing according to the preset formula. The overall structure can also adjust and control the additive stirring speed through multiple stirring mechanisms.

[0040] In a preferred embodiment, the regulating mechanism 5 includes a storage tank 501, which is connected to the mixing tank via a first pump 502, connected to the mixing tank via a gas valve 505, and connected to the dynamic mixer 11 via a second pump 506. With this structure, the various devices of the regulating mechanism 5 can achieve online control and monitoring of the feed rate, discharge rate, and pressure of various additives. This results in high mixing efficiency, a high degree of automation, and the ability to automatically add the required amount of raw materials, greatly improving work efficiency.

[0041] In the preferred embodiment, a first valve 503 is provided on one side of the first pump 502, and a filter 504 is provided on one side of the first valve 503. The filter 504 is connected to the storage tank 501. With this structure, the flow valve 507 and the second flow valve 508 adjust the discharge speed and quantity to the dynamic mixer 11 in real time, ensuring mixing according to the preset formula. The gas valve 505 controls the gas inlet and outlet of the system in real time, and controls the system pressure in real time. The first valve 503 and the filter 504 adjust the feed rate of material into the storage tank 501 in real time. All three systems include a regulating mechanism 5 to online control and monitor the feed rate, discharge rate, temperature, and pressure of terephthalic acid 102, pyridinium chloride 202, and titanium dioxide 302. The mixing tanks of the first three systems are equipped with stirring devices to adjust and control the stirring speed of the three additives.

[0042] In a preferred embodiment, a flow valve 507 is provided on one side of the second pump 506, and a second flow valve 508 is provided on one side of the storage tank 501. One end of the second flow valve 508 is connected to the storage tank 501, and the other end of the second flow valve 508 is connected to the pipeline between the second pump 506 and the flow valve 507. With this structure, the mixed liquid enters the regulating mechanism 5 of the system, and the regulating mechanism 5 sequentially delivers the liquid to the dynamic mixer 11.

[0043] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A control device for improving the mixing efficiency of polyamide 6 prepolymer additives, characterized in that: It includes a terephthalic acid control system (1), a pyridinamide control system (2), a titanium dioxide control system (3) and a caprolactam control system (4). The terephthalic acid control system (1), the pyridinamide control system (2) and the titanium dioxide control system (3) all include a control mechanism (5). All three control mechanisms (5) are connected to a dynamic mixer (11). A second heat exchanger (9) and a second static mixer (10) are provided between the terephthalic acid control system (1) and the pyridinamide control system (2).

2. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 1, characterized in that: The terephthalic acid control system (1) includes a first mixing tank (101), on which terephthalic acid (102) is connected, and on one side of the first mixing tank (101) is a water seal tank (103) connected, the water seal tank (103) is connected to the second heat exchanger (9), and the first mixing tank (101) is connected to the first caprolactam (104).

3. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 1, characterized in that: The second heat exchanger (9) is connected to the first static mixer (8), the first static mixer (8) is connected to the first heat exchanger (7), the first heat exchanger (7) is connected to the prepolymer reactor (6), and the second static mixer (10) is connected to the dynamic mixer (11).

4. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 1, characterized in that: The pyridinium control system (2) includes a second mixing tank (201), a connected pyridinium (202) is provided on the second mixing tank (201), and a connected second water seal tank (203) is provided on one side of the second mixing tank (201). The second water seal tank (203) is connected to the tank for storing demineralized water.

5. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 1, characterized in that: titanium dioxide... The control system (3) includes a third mixing tank (301), and the third mixing tank (301) is provided with a connected titanium dioxide (302). The third batching tank (301) is connected to the tank for storing demineralized water, and the third batching tank (301) is connected to the tank for storing caprolactam (303).

6. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 1, characterized in that: The caprolactam control system (4) includes a second caprolactam (401), which is connected to a heater (403). A flow meter (402) is provided on one side of the heater (403), and the heater (403) is connected to a dynamic mixer (11). Caprolactam (401) is connected to the tank for storing demineralized water.

7. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 1, characterized in that: The regulating mechanism (5) includes a storage tank (501), which is connected to the batching tank via a first pump (502), and is connected to the batching tank via a gas valve (505). The storage tank (501) is also connected to the dynamic mixer (11) via a second pump (506).

8. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 7, characterized in that: A first valve (503) is provided on one side of the first pump (502), and a filter (504) is provided on one side of the first valve (503). The filter (504) is connected to the storage tank (501).

9. The control device for improving the mixing efficiency of polyamide 6 prepolymer additives according to claim 7, characterized in that: A flow valve (507) is provided on one side of the second pump (506), and a second flow valve (508) is provided on one side of the storage tank (501). One end of the second flow valve (508) is connected to the storage tank (501), and the other end of the second flow valve (508) is connected to the pipeline between the second pump (506) and the flow valve (507).

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