Production load adjustable reaction kettle

Abstract

The invention provides a production load adjustable reaction kettle. The production load adjustable reaction kettle comprises a kettle body and a kettle cover, wherein the kettle body and the kettle cover are connected through a flange; a liquid inlet and a liquid outlet are formed in the kettle cover; a lower liquid outlet is formed in the bottom of the kettle body; a stirrer is arranged in the kettle body; the top of the stirrer is connected to the rotating shaft of a motor; the stirrer is a frame-type stirrer; and a scraper is arranged on the surface of the stirrer. According to the reaction kettle, the production load can be adjusted according to production plant, the kettle can run in a full or half manner, and the problem of gas-phase gel is solved; by adopting the frame-type stirrer, the relatively large diameter of a frame is beneficial for heat transfer, and driven liquid can take down a static layer from the wall of a polymeric kettle. A circulating pipe is arranged outside the kettle, and the heat of the kettle can be taken away in an external cycle manner.

Description

technical field

[0001] The invention relates to an adjustable production load reactor. Background technique

[0002] The most traditional and currently most commonly used polymerization method for PAN precursors is solution polymerization. With the expansion of production scale, the volume of the reactor will increase, and many problems will arise at the same time. The common ones are uneven stirring, gelling, lower conversion rate, unstable reaction, etc. The existing single-pot reaction viscosity of the polymerization kettle is about 20,000CP, and a single-ribbon stirrer should be used. And it is a full tank polymerization, which is easy to produce gel during the polymerization process, resulting in a short polymerization cycle. Contents of the invention

[0003] In view of the above existing problems, the present invention provides a reaction kettle, which can effectively solve the gel problem by changing the structure.

[0004] Technical solution of the present ...

Examples

Embodiment 1

[0014] like figure 1 As shown, a reaction kettle with adjustable production load includes a kettle body 1 and a kettle cover 2. The kettle body 1 and the kettle cover 2 are connected by a flange 3. There is a frame stirrer in the kettle body 1, and the surface of the stirrer 4 A scraper 7 is provided, and the scraper 7 adopts a helical or wavy scraper. There is a liquid inlet 5 and a liquid outlet 6 on the lid 2 of the kettle. The bottom of the kettle body 1 is provided with a lower liquid outlet 9. The frame agitator can operate with a full kettle or a half kettle. Because the frame-type agitator is used, the diameter of the frame type is large, which is conducive to heat transfer. The liquid driven by it can bring the static layer down from the wall of the polymerization tank to solve the problem of gas phase gel, and the conversion rate of the total reaction of the reactor can reach 97.5-98.5%.

[0015] The kettle body 1 has a liquid outlet 6 and a lower liquid outlet 9, ...

Embodiment 2

[0017] Embodiment 2 is the same as Embodiment 1, a kind of production load adjustable reaction kettle, the difference is that: the kettle body 1 is provided with an external circulation pipe 8, and one end of the external circulation pipe 8 is connected to the lower liquid outlet 9, and the external circulation The other end of the pipe 8 is connected to the kettle body 1, and the polymerization liquid in the kettle body 1 is returned to the kettle body 1 through the lower liquid outlet 9 through the external circulation pipe 8, thus forming an external circulation of the kettle body, thereby taking away heat.

Embodiment 4

[0019] Embodiment 4 is the same as Embodiment 1, a kind of production load adjustable reaction kettle, the difference is that: the kettle body 1 is provided with a cooling water jacket 10, and there is cooling water in the cooling water jacket 10, so as to realize the constant temperature jacket And internal temperature-jacket temperature control, improve control accuracy, and prevent accidents caused by temperature out of control or fluctuations in process parameters from affecting the reaction effect.

technical field

[0001] The invention relates to an adjustable production load reactor. Background technique

[0002] The most traditional and currently most commonly used polymerization method for PAN precursors is solution polymerization. With the expansion of production scale, the volume of the reactor will increase, and many problems will arise at the same time. The common ones are uneven stirring, gelling, lower conversion rate, unstable reaction, etc. The existing single-pot reaction viscosity of the polymerization kettle is about 20,000CP, and a single-ribbon stirrer should be used. And it is a full tank polymerization, which is easy to produce gel during the polymerization process, resulting in a short polymerization cycle. Contents of the invention

[0003] In view of the above existing problems, the present invention provides a reaction kettle, which can effectively solve the gel problem by changing the structure.

[0004] Technical solution of the present ...

Examples

Embodiment 1

[0014] like figure 1 As shown, a reaction kettle with adjustable production load includes a kettle body 1 and a kettle cover 2. The kettle body 1 and the kettle cover 2 are connected by a flange 3. There is a frame stirrer in the kettle body 1, and the surface of the stirrer 4 A scraper 7 is provided, and the scraper 7 adopts a helical or wavy scraper. There is a liquid inlet 5 and a liquid outlet 6 on the lid 2 of the kettle. The bottom of the kettle body 1 is provided with a lower liquid outlet 9. The frame agitator can operate with a full kettle or a half kettle. Because the frame-type agitator is used, the diameter of the frame type is large, which is conducive to heat transfer. The liquid driven by it can bring the static layer down from the wall of the polymerization tank to solve the problem of gas phase gel, and the conversion rate of the total reaction of the reactor can reach 97.5-98.5%.

[0015] The kettle body 1 has a liquid outlet 6 and a lower liquid outlet 9, ...

Embodiment 2

[0017] Embodiment 2 is the same as Embodiment 1, a kind of production load adjustable reaction kettle, the difference is that: the kettle body 1 is provided with an external circulation pipe 8, and one end of the external circulation pipe 8 is connected to the lower liquid outlet 9, and the external circulation The other end of the pipe 8 is connected to the kettle body 1, and the polymerization liquid in the kettle body 1 is returned to the kettle body 1 through the lower liquid outlet 9 through the external circulation pipe 8, thus forming an external circulation of the kettle body, thereby taking away heat.

Embodiment 4

[0019] Embodiment 4 is the same as Embodiment 1, a kind of production load adjustable reaction kettle, the difference is that: the kettle body 1 is provided with a cooling water jacket 10, and there is cooling water in the cooling water jacket 10, so as to realize the constant temperature jacket And internal temperature-jacket temperature control, improve control accuracy, and prevent accidents caused by temperature out of control or fluctuations in process parameters from affecting the reaction effect.

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