Carbon fiber precursor polymerization efficient temperature control structure

Abstract

The utility model discloses a carbon fiber precursor polymerization efficient temperature control structure, and belongs to the technical field of chemical equipment reaction kettle temperature control. Comprising a reaction kettle, the reaction kettle is communicated with a polymerization inhibitor dissolving tank and a regulator dissolving tank, the polymerization inhibitor dissolving tank is communicated with a polymerization inhibitor temporary storage tank, the reaction kettle is communicated with a temperature control system, the temperature control system comprises a heat adjusting assembly and temperature control assemblies, and the temperature control assemblies are arranged on the reaction kettle and the heat adjusting assembly respectively. A valve group is arranged on the heat adjusting assembly; according to the carbon fiber precursor polymerization efficient temperature control structure, circulating water and cold water are combined to serve as a heat exchange medium, a high-precision temperature control system is matched, accurate temperature control can be achieved when polymerization temperature control fluctuation is large, the scaling condition of a heat exchange coil can be effectively reduced through desalted water, the attenuation time of heat exchange is greatly shortened, and the temperature control efficiency is improved. The cleaning frequency of the guide cylinder and the heat exchange coil is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of the temperature control of chemical reaction kettles, and particularly relates to a high-efficiency temperature control structure for the polymerization of carbon fiber precursor filaments. Background Technique

[0002] Carbon fiber is a fibrous graphite material with a carbon content of more than 90%, and has the advantages of high axial strength and modulus, low density, good corrosion resistance, etc. The preparation of the existing PAN precursor filaments mainly includes two steps: polymerization and spinning. And acrylonitrile polymerization is an exothermic reaction, and the reaction rate increases with the increase of the polymerization temperature. It is extremely easy to have the situation that the reaction heat is not easily carried out or the stirring is uneven, forming a local overheating area. In these areas, the reaction heat is more intense, generating more heat, making the reaction temperature higher, thus forming a vicious cycle. The intense reaction in these areas is easy to cause molecular branching and cross-linking to form small particle gels. At the same time, the molecular weight is also lower and the distribution is wider than that in other places. All these have an adverse impact on the properties of the final polymer.

[0003] In this application, circulating water + chilled water are jointly used as the heat exchange medium, and are equipped with a high-precision temperature control system, which can achieve precise temperature control when the polymerization temperature control fluctuates greatly, effectively reduce the scaling of the heat exchange coil, greatly reduce the attenuation time of heat exchange, reduce the cleaning frequency of the draft tube and the heat exchange coil, and improve production efficiency. Content of the Utility Model

[0004] The utility model mainly solves the technical problems existing in the above-mentioned prior art, and provides a high-efficiency temperature control structure for the polymerization of carbon fiber precursor filaments.

[0005] The above technical problems of the utility model are mainly solved by the following technical solutions: a high-efficiency temperature control structure for the polymerization of carbon fiber precursor filaments, including a reaction kettle, a polymerization inhibitor dissolution tank and a regulator dissolution tank are connected to the reaction kettle, a polymerization inhibitor temporary storage tank is connected to the polymerization inhibitor dissolution tank, a temperature control system is connected to the reaction kettle, the temperature control system includes a heat regulation component and a temperature control component, and a valve group is arranged on the heat regulation component.

[0006] Preferably, the heat regulation component includes a temperature control water pump, a heat exchanger, a temperature control water container, a heat exchange water pipe, a temperature control water pipe, a hot water pipe, a cold water pipe, a mixing water pipe and a return water pipe. The heat exchange water pipe is connected to the heat exchanger, the temperature control water pipe is connected to the temperature control water pump and the heat exchanger and is connected to the hot water pipe, the cold water pipe is connected to the reaction kettle and a cold water branch pipe is branched from the cold water pipe and is connected to the hot water pipe, one end of the mixing water pipe is connected to the connection part of the cold water branch pipe and the hot water pipe, the other end of the mixing water pipe is connected to the end of the cold water pipe close to the reaction kettle, and a mixing branch pipe is branched from the mixing water pipe and is connected to the reaction kettle.

[0007] Preferably, the temperature control assembly includes a first temperature control display, a second temperature control display, a third temperature control display, a fourth temperature control display, and a fifth temperature control display. The first temperature control display is arranged on the reactor, the second temperature control display is arranged on the temperature regulating water pipe, the third temperature control display is arranged on the hot water pipe, the fourth temperature control display is arranged on the mixing water pipe, and the fifth temperature control display is arranged on the return water pipe.

[0008] Preferably, the valve group includes a circulating water valve, a temperature regulating water valve, a hot water valve, a cold water valve, a mixing water valve, and a cold water inlet valve. The circulating water valve is arranged on the circulating water pipe, the temperature regulating water valve is arranged on the temperature regulating water pipe, the hot water valve is arranged on the hot water pipe, the cold water valve is arranged on the cold water pipe, the mixing water valve is arranged on the mixing water pipe, and the cold water inlet valve is arranged at one end of the cold water pipe close to the reactor.

[0009] Preferably, a steam water pipe is connected to the hot water pipe, and a steam water valve is arranged on the steam water pipe.

[0010] The beneficial effects of the present utility model are as follows:

[0011] Compared with the prior art, by setting a temperature control system in the present utility model, during the use of the reactor, when the first temperature control display shows that the temperature in the reactor is high, the flow rate of the mixed water entering the reactor is adjusted by the temperature regulating water valve and the mixing water valve to reduce the temperature in the reactor. When the first temperature control display shows that the temperature in the reactor is too high, other water valves are closed, and the cold water volume entering the reactor is adjusted by the cold water valve and the cold water inlet valve to quickly reduce the temperature in the reactor. When the first temperature control display shows that the temperature in the reactor is low, other temperature regulating water valves are closed, and the hot water volume entering the reactor is adjusted by the hot water valve, the steam water valve, and the mixing water valve to increase the temperature in the reactor. Through the cooperation of the above heat regulating assembly, temperature control assembly, and valve group, the stability and uniformity of the polymerization liquid in the reactor are improved, and at the same time, the scaling of the outer coil, inner coil, and draft tube outside the reactor can be delayed, the heat exchange efficiency can be improved, the consumption can be reduced, and the production cost can be lowered. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the principle structure of the present utility model.

[0013] In the figure: 1, reaction kettle; 2, inhibitor dissolution tank; 3, regulator dissolution tank; 4, inhibitor temporary storage tank; 5, temperature regulating water pump; 6, heat exchanger; 7, temperature regulating water container; 8, hot water exchange pipe; 9, temperature regulating water pipe; 10, hot water pipe; 11, cold water pipe; 12, mixed water pipe; 13, return water pipe; 14, cold water branch pipe; 15, mixed branch pipe; 16, first temperature control display; 17, second temperature control display; 18, third temperature control display; 19, fourth temperature control display; 20, fifth temperature control display; 21, circulating water valve; 22, temperature regulating water valve; 23, hot water valve; 24, cold water valve; 25, mixed water valve; 26, cold water inlet valve; 27, steam water pipe; 28, steam water valve. Specific embodiments

[0014] The following is through examples and in combination with the attached Figure 1 As shown in the structure, the technical solution of the present utility model will be further specifically described.

[0015] Example: A high-efficiency temperature control structure for carbon fiber precursor polymerization, including a reaction kettle 1. Inside the reaction kettle 1, there are a draft tube, an inner coil pipe, and an outer coil pipe for adjusting the temperature inside the kettle in sequence from the inside to the outside. The reaction kettle 1 is connected to an inhibitor dissolution tank 2 and a regulator dissolution tank 3. The inhibitor dissolution tank 2 is connected to an inhibitor temporary storage tank 4. The reaction kettle 1 is connected to a temperature control system. The temperature control system includes a heat adjustment component and a temperature control component. The heat adjustment component is connected to the draft tube inside the reaction kettle 1. The temperature control component is respectively arranged on the reaction kettle 1 and the heat adjustment component. The heat adjustment component is provided with a valve group. When in use, qualified monomer solution and initiator solution are prepared in advance, and the two solutions are dissolved at low temperature. After preparation, the two solutions are stored at low temperature for standby. Then, the heat adjustment component is opened through the valve group to preheat the reaction kettle 1, and the temperature inside the kettle is controlled within the required temperature range through the temperature control component. And while the heat adjustment component starts to work, the temperature control component controls the temperature of the heat adjustment component within the required range. Then, the prepared monomer solution is put into the reaction kettle 1, and then the regulator, inhibitor, and initiator are added in sequence. When the mixed solution in the reaction kettle 1 starts to react, the temperature inside the reaction kettle 1 is controlled through the cooperation of the heat component and the temperature control component.

[0016] The heat adjustment component includes a temperature regulating water pump 5, a heat exchanger 6, a temperature regulating water container 7, a hot water exchange pipe 8, a temperature regulating water pipe 9, a hot water pipe 10, a cold water pipe 11, a mixed water pipe 12, and a return water pipe 13. The temperature control component includes a first temperature control display 16, a second temperature control display 17, a third temperature control display 18, a fourth temperature control display 19, and a fifth temperature control display 20.

[0017] Such as Figure 1As shown, the heat exchange water pipe 8 is connected to the heat exchanger 6, connects the temperature regulating water pump 5 and the heat exchanger 6 and is connected to the hot water pipe 10. One end of the return water pipe 13 is connected to the reaction kettle 1, and the other end is connected to the temperature regulating water pump 5. The temperature regulating water container 7 is arranged on the return water pipe 13. During use, the temperature of the water in the temperature regulating water pipe 9 is adjusted through the heat exchange water pipe 8. The cold water pipe 11 is connected to the draft tube in the reaction kettle 1. A cold water branch pipe 14 is branched from the cold water pipe 11 and connected to the hot water pipe 10. The connection point of the cold water branch pipe 14 and the hot water pipe 10 is connected to the mixing water pipe 12. The other end of the mixing water pipe 12 is connected to the cold water pipe 11. Two mixing branch pipes 15 are branched from the mixing water pipe 12 and respectively connected to the inner coil and the outer coil. Multiple branch pipes are connected to the return water pipe 13 and respectively connected to the draft tube, the inner coil and the outer coil.

[0018] The first temperature control display 16 is arranged on the reaction kettle 1 for monitoring and controlling the temperature in the reaction kettle 1. The second temperature control display 17 is arranged on the temperature regulating water pipe 9 for monitoring and controlling the temperature of the water in the heat exchange water pipe 8 and the temperature regulating water pipe 9. The third temperature control display 18 is arranged on the hot water pipe 10 for monitoring and controlling the temperature of the water in the hot water pipe 10. The fourth temperature control display 19 is arranged on the mixing water pipe 12 for monitoring and controlling the temperature of the water entering the mixing water pipe 12. The fifth temperature control display 20 is arranged on the return water pipe 13 for monitoring the temperature of the water in the return water pipe 13. When the water temperature in the return water pipe 13 is relatively low, the water temperature can be adjusted by adding hot water (demineralized water) to the temperature regulating water container 7.

[0019] The valve group includes a circulating water valve 21, a temperature regulating water valve 22, a hot water valve 23, a cold water valve 24, a mixing water valve 25 and a cold water inlet valve 26. The circulating water valve 21 is arranged on the circulating water pipe. The temperature regulating water valve 22 is arranged on the temperature regulating water pipe 9. The hot water valve 23 is arranged on the hot water pipe 10. A steam water pipe 27 is connected to the hot water pipe 10, and a steam water valve 28 is arranged on the steam water pipe 27. The cold water valve 24 is arranged on the cold water pipe 11. The mixing water valve 25 is arranged on the mixing water pipe 12. The detailed positions of the respective water valves of the valve group are as Figure 1 shown, and the setting of the valve group controls the water flow in each water pipe respectively.

[0020] The working principle of the present utility model:

[0021] In use, the operator first opens the hot water valve 23, the steam water valve 28, and the mixed water valve 25 to a certain opening degree. Hot water (demineralized water) and steam enter the mixing water pipe 12 through the hot water pipe 10, and then enter the draft tube, the inner coil, and the outer coil in the reaction kettle 1 through the mixing water pipe 12 and two mixing branch pipes 15 respectively to preheat the inside of the reaction kettle 1. During the preheating process, the water in the draft tube, the inner coil, and the outer coil enters the temperature control water container 7 through the return water pipe 13. When there is a certain liquid level in the temperature control water container 7, start the temperature control water pump 5 to pump out the water in the temperature control water container 7. At this time, open the heat exchange hot water valve 23 to a certain opening degree, and control the water in the temperature control water pipe 9 within the required temperature range according to the required temperature range through the second temperature display controller. When the first temperature control display 16 monitors that the temperature in the reaction kettle 1 reaches the requirement, input the monomer solvent required for the reaction into the reactor in proportion, then add the regulator and the inhibitor, and finally add the initiator and control and monitor the reaction temperature of the reaction kettle 1 through the first temperature control display 16; when the temperature of the mixed liquid in the reaction kettle 1 needs to be adjusted during the chemical reaction process, it can be adjusted as required:

[0022] 1. When the temperature in the reaction kettle 1 is relatively high, adjust the temperature control water valve 22 and the mixed water valve 25 to make the temperature control water after passing through the heat exchanger 6 enter the reaction kettle 1 to adjust its temperature, so that the temperature in the reaction kettle 1 is controlled within the required temperature range for the reaction;

[0023] 2. When the temperature in the reaction kettle 1 is too high, close other water valves, and open the cold water valve 24 and the cold water inlet valve 26 to make the cold water (demineralized water) in the cold water pipe 11 enter the reaction kettle 1 through the mixing branch pipe 15 and the cold water pipe 11 to quickly reduce the temperature in the reaction kettle 1 to the required temperature range;

[0024] 3. When the temperature in the reaction kettle 1 is relatively low, close the temperature control water valve 22, the cold water valve 24, and the cold water inlet valve 26, and adjust the opening degrees of the hot water valve 23, the steam water valve 28, and the mixed water valve 25 to make the hot water enter the reaction kettle 1 to quickly raise its temperature to the required temperature range for the reaction.

[0025] Finally, it should be pointed out that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A carbon fiber precursor polymerization high-efficiency temperature control structure, comprising a reaction kettle (1), characterized in that: The reactor (1) is connected to a polymerization inhibitor dissolving tank (2) and a regulating agent dissolving tank (3), the polymerization inhibitor dissolving tank (2) is connected to a polymerization inhibitor temporary storage tank (4), and the reactor (1) is connected to a temperature control system, the temperature control system comprises a heat regulating component and a temperature control component, and the heat regulating component is provided with a valve group.

2. The carbon fiber precursor polymerization efficient temperature control structure according to claim 1, characterized in that: The heat regulating component comprises a temperature regulating water pump (5), a heat exchanger (6), a temperature regulating water container (7), a heat exchange water pipe (8), a temperature regulating water pipe (9), a hot water pipe (10), a cold water pipe (11), a mixing water pipe (12) and a return water pipe (13); the heat exchange water pipe (8) is connected to the heat exchanger (6); the temperature regulating water pipe (9) is connected to the temperature regulating water pump (5) and the heat exchanger (6) and is connected to the hot water pipe (10); the cold water pipe (11) is connected to the reactor (1) and a cold water branch pipe (14) is branched from the cold water pipe (11) and is connected to the hot water pipe (10); one end of the mixing water pipe (12) is connected to the connection point between the cold water branch pipe (14) and the hot water pipe (10); the other end of the mixing water pipe (12) is connected to one end of the cold water pipe (11) close to the reactor (1); and a mixing branch pipe (15) is branched from the mixing water pipe (12) and is connected to the reactor (1).

3. The carbon fiber precursor polymerization high-efficiency temperature control structure according to claim 2, characterized in that: The temperature control component comprises a first temperature control display (16), a second temperature control display (17), a third temperature control display (18), a fourth temperature control display (19) and a fifth temperature control display (20), wherein the first temperature control display (16) is arranged on the reaction kettle (1), the second temperature control display (17) is arranged on the temperature regulating water pipe (9), the third temperature control display (18) is arranged on the hot water pipe (10), the fourth temperature control display (19) is arranged on the mixing water pipe (12), and the fifth temperature control display (20) is arranged on the return water pipe (13).

4. The carbon fiber precursor polymerization high-efficiency temperature control structure according to claim 2, characterized in that: The valve group comprises a circulating water valve (21), a thermostatic water valve (22), a hot water valve (23), a cold water valve (24), a mixing water valve (25) and a cold water inlet valve (26); the circulating water valve (21) is arranged on the circulating water pipe, the thermostatic water valve (22) is arranged on the thermostatic water pipe (9), the hot water valve (23) is arranged on the hot water pipe (10), the cold water valve (24) is arranged on the cold water pipe (11), the mixing water valve (25) is arranged on the mixing water pipe (12), and the cold water inlet valve (26) is arranged at one end of the cold water pipe (11) close to the reaction kettle (1).

5. The carbon fiber precursor polymerization efficient temperature control structure according to claim 4, characterized in that: The hot water pipe (10) is connected to a steam water pipe (27), and the steam water pipe (27) is provided with a steam water valve (28).

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