A constant pressure control device based on amination reactor

Abstract

The utility model relates to the technical field of amination reactors, and in particular to a constant pressure control device based on an amination reactor; the device comprises an amination reactor, a pressure relief hole is arranged on the top of the amination reactor, a constant pressure mechanism is arranged on the top of the pressure relief hole, and a recovery tank is arranged on the outer peripheral wall of the amination reactor; the utility model discharges excess material into the recovery tank through the constant pressure mechanism, cools the material and delivers the material to the amination reactor through a feed pump, which can avoid high-temperature material being directly discharged into the atmosphere to pollute the atmospheric environment, and avoids the loss of chemical components in the material by discharging the cooled material into the amination reactor again, and can quickly reduce the pressure in the amination reactor to quickly restore it to a certain pressure, and can supplement the pressure of the material in the amination reactor without affecting the reaction of the material in the amination reactor through the mutual cooperation of structures such as a methylamine feed pipeline, a butyrolactone feed pipeline and a booster tank, so as to keep the pressure in the amination reactor constant.

Description

Technical Field

[0001] The utility model relates to the technical field of amination reactors, in particular to a constant pressure control device based on an amination reactor. Background Art

[0002] The synthesis of N-methylpyrrolidone (NMP) is divided into two routes: catalytic and non-catalytic. At present, the process of synthesizing NMP by amination of γ-butyrolactone and methylamine aqueous solution without catalyst is widely used at home and abroad. Among the approximately 50 NMP production enterprises in China, about 20 have the ability to synthesize, all of which are non-catalyzed synthesis processes, and all use shell-and-tube reactors. Shell-and-tube reactors have the advantages of simple production and low maintenance costs, but they also have the disadvantages of large floor space and low production capacity of a single set of synthesis equipment. They are mainly used for lithium battery slurry, chemical industry, polymer materials, etc. In industry, many chemical reactions need to be carried out at a certain pressure and temperature. For example, in the process with catalysts in industry, the ZSM-5 molecular sieve composite rare earth cerium catalyst is introduced into the amination reaction system to increase the reaction rate. The residence time of the reactants in the amination reactor is 0.4-06h, the pressure is 4.6-5.2MPa, and the temperature is 140-200℃.

[0003] However, in some reaction processes, heat release or heat absorption will occur, so the temperature in the amination reactor is difficult to control at a constant temperature. Temperature is an important factor affecting pressure. Therefore, in the amination reactor, if the temperature in the amination reactor suddenly rises, the pressure in the reactor will suddenly increase, which will not only affect the reaction efficiency, but also cause the risk of explosion. At present, safety valves are often used in the market to ensure the pressure of the reactor, but the high-temperature materials containing chemical components in the reactor are directly discharged into the atmosphere, which will affect the atmospheric environment. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a constant pressure control device based on an amination reactor, which can not only quickly keep the pressure in the amination reactor in a constant state, but also recycle and reuse its excess materials, thereby ensuring the reaction speed, stabilizing product quality and reducing damage to the environment.

[0005] In order to achieve the above technical purpose, the utility model proposes the following technical scheme: a constant pressure control device based on an amination reactor, comprising an amination reactor, a pressure relief hole is provided on the top of the amination reactor, a constant pressure mechanism is provided on the top of the pressure relief hole, a recovery tank is provided on the outer peripheral wall of the amination reactor, a water cooling pipe is spirally distributed in the recovery tank, the recovery tank is connected to the discharge end of the constant pressure mechanism through a spiral recovery pipeline, one end of the recovery tank is connected to the amination reactor through a loop pipeline, and a feed pump is installed on the loop pipeline.

[0006] Furthermore, the constant pressure mechanism includes an upper valve body and a lower valve body, the shell of the lower valve body is thicker than that of the upper valve body, and a thread is provided on the outer wall of the lower valve body, and a cavity is provided in the upper valve body and the lower valve body, and a pressure spring and a constant pressure block with a hemispherical structure at the bottom are provided in the cavity, the pressure spring is fixedly connected to the top of the constant pressure block, a plurality of material holes are provided on the outer wall of the upper valve body, and a collecting sleeve is threadedly connected to the outer sides of the upper valve body and the lower valve body, and the top of the collecting sleeve is connected to the end of the spiral recovery pipe away from the recovery tank.

[0007] Furthermore, a sealing gasket is provided at the bottom of the outer wall of the lower valve body.

[0008] Furthermore, an intelligent controller is provided on one side of the amination reactor, a pressure transmitter is provided on the amination reactor, an output end of the pressure transmitter is electrically connected to an input end of the intelligent controller, and an output end of the intelligent controller is electrically connected to an input end of a feed pump.

[0009] Furthermore, a boosting tank is provided on one side of the amination reactor, the outlet end of the boosting tank is connected to the feed port end of the amination reactor through a boosting pipe, a boosting pump is provided on the pipeline of the boosting pipe, and two inlet ends are provided on the boosting tank, a methylamine feed pipeline and a butyrolactone feed pipeline are respectively installed on the inlet ends, a methylamine feed pipeline and a butyrolactone feed pipeline are respectively provided on the methylamine feed pipeline and the butyrolactone feed pipeline, and the input ends of the methylamine pump, the butyrolactone pump and the boosting pump are all connected to the output end of the intelligent controller.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the utility model has a novel structure, an ingenious conception, and is simple and convenient to operate. Compared with the prior art, the utility model has the following advantages: the utility model discharges excess material into a recovery tank through a constant pressure mechanism, cools the material, and delivers the material to an amination reactor through a feed pump. On the one hand, it can avoid high-temperature material being directly discharged into the atmosphere to pollute the atmospheric environment. On the other hand, by discharging the cooled material into the amination reactor again, it can avoid the loss of chemical components in the material, and reduce the internal temperature of the amination reactor, so that the pressure in the amination reactor can be quickly reduced to quickly restore it to a certain pressure. Through the mutual cooperation of structures such as a methylamine feed pipeline, a butyrolactone feed pipeline, and a booster tank, the material reaction in the amination reactor is supplemented without affecting the pressure, so as to keep the pressure in the amination reactor constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a schematic cross-sectional structure diagram of the constant pressure mechanism of the utility model.

[0013] In the figure, 1. amination reactor; 2. pressure relief hole; 3. constant pressure mechanism; 301. lower valve body; 302. upper valve body; 303. thread; 304. cavity; 305. constant pressure block; 306. pressure spring; 307. material hole; 308. collecting sleeve; 309. sealing gasket; 4. recovery tank; 5. water cooling pipe; 6. spiral recovery pipeline; 7. loop pipeline; 8. feed pump; 9. intelligent controller; 10. pressure transmitter; 11. booster tank; 12. booster pipe; 13. booster pump; 14. methylamine feed pipeline; 15. butyrolactone feed pipeline; 16. methylamine pump; 17. butyrolactone pump. DETAILED DESCRIPTION

[0014] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0015] like Figure 1 and 2 As shown, the utility model provides a constant pressure control device based on an amination reactor, comprising an amination reactor 1, a pressure relief hole 2 is provided on the top of the amination reactor 1, a constant pressure mechanism 3 is provided on the top of the pressure relief hole 2, a recovery tank 4 is provided on the outer peripheral wall of the amination reactor 1, a water cooling pipe 5 is spirally distributed in the recovery tank 4, the recovery tank 4 is connected to the discharge end of the constant pressure mechanism 3 through a spiral recovery pipeline 6, one end of the recovery tank 4 is connected to the amination reactor 1 through a loop pipeline 7, and a feed pump 8 is installed on the loop pipeline 7.

[0016] like Figure 1 As shown, the spiral recovery pipe 6 can pre-cool the high-temperature material. In order to improve the safety of the spiral recovery pipe 6, the spiral recovery pipe 6 can be placed in a sleeve, and the spiral recovery pipe 6 in the sleeve is air-cooled and pre-cooled by a fan, which is not shown in the figure, to achieve preliminary cooling; the temperature in the amination reactor 1 rises, resulting in an increase in the pressure in the amination reactor 1, and the material will enter the recovery tank 4 through the constant pressure mechanism 3 and the spiral recovery pipe 6 for cooling. The recovery tank 4 is arranged around the outer wall of the amination reactor 1, and the temperature of the material entering the recovery tank 4 is relatively high. It is heat exchanged through the water cooling pipe 5, which can cool the amination reactor 1, which is beneficial to the reaction. At the same time, the cooled material is transported to the amination reactor 1 again through the feed pump 8, so that the recovered material can be reused, and the pressure in the amination reactor 1 can be quickly adjusted to keep it constant.

[0017] The constant pressure mechanism 3 comprises an upper valve body 302 and a lower valve body 301. The shell of the lower valve body 301 is thicker than that of the upper valve body 302, so that when the collecting sleeve 308 is installed on the upper valve body 302 and the lower valve body 301, the collecting sleeve 308 can be threadedly installed on the lower valve body 301, and a certain gap allowing material flow can be provided between the outer wall of the upper valve body 302 and the inner wall of the collecting sleeve 308. The outer wall of the lower valve body 301 is provided with a thread 303. 02 and the lower valve body 301 are provided with a cavity 304, and a compression spring 306 and a constant pressure block 305 with a hemispherical structure at the bottom are provided in the cavity 304, the compression spring 306 is fixedly connected to the top of the constant pressure block 305, and a plurality of material holes 307 are provided on the outer wall of the upper valve body 302, and the outer sides of the upper valve body 302 and the lower valve body 301 are threadedly connected with a collecting sleeve 308, and the top of the collecting sleeve 308 is connected to the end of the spiral recovery pipe 6 away from the recovery tank 4.

[0018] like Figure 2 As shown, if the pressure in the amination reactor 1 increases, the material will push open the constant pressure block 305, and the bottom of the constant pressure block 305 will be separated from the pressure relief hole 2. At the same time, the constant pressure block 305 squeezes the pressure spring 306, so that the material enters the collection sleeve 308 along the material hole 307, and then enters the recovery tank 4 along the recovery pipeline 6. Under normal circumstances, the constant pressure block 305 is squeezed by the pressure spring 306, and the constant pressure block 305 is in the pressure relief hole 2, and the pressure relief hole 2 is in a sealed state.

[0019] A sealing gasket 309 is provided at the bottom of the outer wall of the lower valve body 301 .

[0020] like Figure 1 As shown, the sealing gasket 309 seals the collecting sleeve 308 and the lower valve body 301 to prevent the material from being discharged out of the constant pressure mechanism 3 along the thread gap.

[0021] An intelligent controller 9 is provided on one side of the amination reactor 1 , and a pressure transmitter 10 is provided on the amination reactor 1 . The output end of the pressure transmitter 10 is electrically connected to the input end of the intelligent controller 9 , and the output end of the intelligent controller 9 is electrically connected to the input end of the feed pump 5 .

[0022] like Figure 1 As shown, in this embodiment, the intelligent controller 9 is a PLC intelligent controller, and the pressure transmitter 10 is used to detect the pressure in the amination reactor 1 and feed it back to the intelligent controller 9, and the intelligent controller 9 controls the opening or closing of the feed pump 8.

[0023] A boosting tank 11 is provided on one side of the amination reactor 1, and the outlet end of the boosting tank 11 is connected to the feed port end of the amination reactor 1 through a boosting pipe 12, and a boosting pump 13 is provided on the pipeline of the boosting pipe 12. The boosting tank 11 is provided with two inlet ends, and a methylamine feed pipeline 14 and a butyrolactone feed pipeline 15 are respectively installed on the inlet ends. A methylamine feed pipeline 16 and a butyrolactone pump 17 are respectively provided on the methylamine feed pipeline 14 and the butyrolactone feed pipeline 15, and the input ends of the methylamine pump 16, the butyrolactone pump 17 and the boosting pump 13 are all connected to the output end of the intelligent controller 9.

[0024] like Figure 1 As shown, methylamine and butyrolactone reactants are respectively injected into the boosting tank 11 by the methylamine pump 16 and the butyrolactone pump 17, the material in the boosting tank 11 is pressurized by the boosting pump 13 and the reactant material in the boosting tank 11 is transported to the amination reactor 1, and the amination reactor 1 is pressurized. By charging the reactant material in a high-pressure state into the amination reactor 1, the reaction in the amination reactor 1 will not be affected. According to the pressure detected by the pressure transmitter 10, the boosting pump 13, the methylamine pump 16 and the butyrolactone pump 17 are controlled to be turned on or off.

[0025] Principle of use: During the reaction, when heat is released, the temperature in the amination reactor 1 rises, causing the material inside to expand and the pressure to increase. The increased pressure will push open the constant pressure block 305, and the bottom of the constant pressure block 305 will be separated from the pressure relief hole 2. At the same time, the constant pressure block 305 squeezes the pressure spring 306, so that the material enters the collection sleeve 308 along the material hole 307, and then enters the recovery tank 4 along the spiral recovery pipeline 6. At the same time, the pressure transmitter 10 detects the pressure increase in the amination reactor 1 and transmits the signal to the intelligent controller 9, which controls the output. The material pump 8 is turned on, and the feed pump 8 discharges the cooled material into the amination reactor 1 again, and so on. This can help to reduce the temperature in the amination reactor 1 until the pressure in the amination reactor 1 drops to the required pressure, so that the pressure in the reactor 1 is quickly restored and maintained in a constant state. When the pressure transmitter 10 detects that the pressure in the amination reactor 1 decreases, the intelligent controller 9 controls the methylamine pump 16 and the butyrolactone pump 17 to transport materials into the boosting tank 1 at a certain ratio, and controls the boosting pump 13 to charge the material in the boosting tank 11 into the amination reactor 1 at a certain pressure.

[0026] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A constant pressure control device based on an amination reactor, comprising an amination reactor (1), characterized in that: A pressure relief hole (2) is provided on the top of the amination reactor (1), a constant pressure mechanism (3) is provided on the top of the pressure relief hole (2), a recovery tank (4) is provided on the outer peripheral wall of the amination reactor (1), a water cooling pipe (5) is spirally distributed in the recovery tank (4), the recovery tank (4) is connected to the discharge end of the constant pressure mechanism (3) through a spiral recovery pipeline (6), one end of the recovery tank (4) is connected to the amination reactor (1) through a loop pipeline (7), a feed pump (8) is installed on the loop pipeline (7), the constant pressure mechanism (3) comprises an upper valve body (302) and a lower valve body (301), the shell of the lower valve body (301) is thicker than the shell of the upper valve body (302), and the lower valve body (301) is thicker than the shell of the upper valve body (302), and the lower valve body (301) is thicker than the shell of the upper valve body (302). A thread (303) is provided on the outer wall of the valve body (301), and a cavity (304) is provided in the upper valve body (302) and the lower valve body (301). A pressure spring (306) and a constant pressure block (305) having a hemispherical bottom are provided in the cavity (304), and the pressure spring (306) is fixedly connected to the top of the constant pressure block (305). A plurality of material holes (307) are provided on the outer wall of the upper valve body (302), and a collecting sleeve (308) is threadedly connected to the outer sides of the upper valve body (302) and the lower valve body (301), and the top of the collecting sleeve (308) is connected to an end of the spiral recovery pipe (6) away from the recovery tank (4).

2. A constant pressure control device based on an amination reactor according to claim 1, characterized in that: A sealing gasket (309) is provided at the bottom of the outer wall of the lower valve body (301).

3. A constant pressure control device based on an amination reactor according to claim 1, characterized in that: An intelligent controller (9) is provided on one side of the amination reactor (1), and a pressure transmitter (10) is provided on the amination reactor (1). The output end of the pressure transmitter (10) is electrically connected to the input end of the intelligent controller (9), and the output end of the intelligent controller (9) is electrically connected to the input end of the feed pump (8).

4. A constant pressure control device based on an amination reactor according to claim 3, characterized in that: A booster tank (11) is provided on one side of the amination reactor (1). The outlet end of the booster tank (11) is connected to the feed port end of the amination reactor (1) via a booster pipe (12). A booster pump (13) is provided on the pipeline of the booster pipe (12). The booster tank (11) is provided with two inlet ends, on which a methylamine feed pipeline (14) and a butyrolactone feed pipeline (15) are installed respectively. A methylamine pump (16) and a butyrolactone pump (17) are provided on the methylamine feed pipeline (14) and the butyrolactone feed pipeline (15), respectively. The input ends of the methylamine pump (16), the butyrolactone pump (17) and the booster pump (13) are all connected to the output end of the intelligent controller (9).

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