Reactor pressure stabilizing device for synthesizing durene

Abstract

The utility model discloses a reactor pressure stabilizing device for synthesizing durene, which relates to the field of pressure stabilization of an inner cavity of an L fixed fluidized bed and comprises a fixed fluidized bed, a first pressure sensor is mounted on the periphery of the fixed fluidized bed, and the sensing end of the first pressure sensor is inserted into the inner cavity of the fixed fluidized bed. A pressure relief mechanism is installed on the periphery of the fixed fluidized bed and located below the first pressure sensor, a pressure supplementing mechanism is installed at the position, symmetrical to the pressure relief mechanism, of the periphery of the fixed fluidized bed, and a downward pressing mechanism penetrating through an inner cavity of the pressure supplementing mechanism is installed on the periphery of the pressure supplementing mechanism. By arranging the pressure supplementing mechanism and the pressure relief mechanism, the pressure supplementing operation or the pressure relief operation can be performed on the fixed fluidized bed according to the real-time pressure in the fixed fluidized bed, so that the reaction pressure in the fixed fluidized bed is maintained.

Description

A reactor pressure stabilizing device for the synthesis of mesitylene. Technical Field

[0001] This utility model relates to the field of internal pressure stabilization in L-type fixed fluidized beds, specifically a reactor pressure stabilization device used in the synthesis of mesitylene. Background Technology

[0002] Pseudotrixene and methanol are pressurized separately using pumps. The pseudotrixene is pressurized to 0.4-0.6 MPa, then passes through a feed heat exchanger to exchange heat with the reaction products, and is further heated to 300-350°C using other heat exchange equipment. The methanol is pressurized to 0.4-0.6 MPa and heated to 130-170°C by a heater to vaporize. The pretreated pseudotrixene enters from the bottom of the fluidized bed reactor, blowing up the catalyst to create a boiling fluidized state. The vaporized methanol is sprayed into the fluidized bed from the lower part of the reactor through a spray gun, where it reacts with the pseudotrixene under the action of the catalyst to undergo a methylation reaction to produce mesitylene.

[0003] In the existing technology, during the production of mesitylene using a fixed fluidized bed, the reaction pressure should be maintained within the fixed fluidized bed. However, the existing technology cannot perform pressure replenishment or depressurization operations based on the real-time status of the fixed fluidized bed. Summary of the Invention

[0004] The purpose of this invention is to provide a reactor pressure stabilizing device for the synthesis of mesitylene, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pressure stabilizing device for a reactor in the synthesis of mesitylene, comprising a fixed fluidized bed, a pressure sensor No. 1 installed on the outer periphery of the fixed fluidized bed, the sensing end of the pressure sensor No. 1 inserted into the inner cavity of the fixed fluidized bed, a pressure relief mechanism installed on the outer periphery of the fixed fluidized bed below the pressure sensor No. 1, a pressure replenishing mechanism installed on the outer periphery of the fixed fluidized bed symmetrically with respect to the pressure relief mechanism, and a downward pressing mechanism penetrating its inner cavity installed on the outer periphery of the pressure replenishing mechanism.

[0006] As a further embodiment of this utility model: the pressure relief mechanism includes a connecting pipe integrally formed on the outer wall of the fixed fluidized bed, a pressure relief pipe integrally formed on the lower outer periphery of the connecting pipe, a pressure relief tank installed at the output end of the pressure relief pipe, a No. 3 pressure sensor installed at the bottom end of the pressure relief tank, the sensing end of the No. 3 pressure sensor being inserted into the inner cavity of the pressure relief tank, a sealing plug slidably connected to the inner wall of the connecting pipe, the sealing plug in the reset state being located at the top opening of the pressure relief pipe, a guide rod fixedly installed at one end of the sealing plug extending to the outside of the connecting pipe, a spring abutting between one end of the sealing plug and one end of the inner wall of the connecting pipe, the spring being sleeved on the outer periphery of the guide rod.

[0007] As a further embodiment of this utility model: the pressure replenishing mechanism includes a pressure replenishing pipe welded to the outer periphery of the fixed fluidized bed, an electromagnetic valve installed on the horizontal section of the pressure replenishing pipe, a pressure replenishing tank installed on the top of the pressure replenishing pipe, and a downwardly protruding tube integrally formed below the pressure replenishing tank on one side of the pressure replenishing pipe. A second pressure sensor is installed at the bottom end of the protruding tube, the inner cavity of the second pressure sensor is connected to the inner cavity of the pressure replenishing tank, the sensing end of the second pressure sensor is located in the inner cavity of the protruding tube, and the electromagnetic valve is electrically connected to the first pressure sensor through a controller.

[0008] As a further embodiment of this utility model: the pressing mechanism includes an electric push cylinder fixedly installed on the outer periphery of the pressure replenishing tank. A connecting plate is installed at the top of the piston rod of the electric push cylinder. A vertical rod penetrating into the inner cavity of the pressure replenishing tank is fixedly installed on one side of the bottom end of the connecting plate. A piston plate is installed at the bottom end of the vertical rod. The piston plate is located in the inner cavity of the pressure replenishing tank.

[0009] As a further embodiment of this utility model: the outer circumference of the pressure replenishing tank is integrally formed with an outwardly protruding No. 2 circulation pipe and a replenishing pipe, and the outer circumference of the pressure relief tank is integrally formed with an outwardly protruding No. 1 circulation pipe. The No. 1 circulation pipe and the No. 2 circulation pipe are connected through a No. 1 pipe. A No. 1 air pump and a No. 1 valve are installed in the middle section of the No. 1 pipe. The replenishing pipe is connected to an external raw material heating tank through a No. 2 pipe, and a No. 2 air pump and a No. 2 valve are installed in the middle section of the pipe.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. By setting up a pressure replenishment mechanism and a pressure relief mechanism, the pressure replenishment or pressure relief operation can be performed on the fixed fluidized bed according to the real-time pressure inside the fixed fluidized bed, so as to maintain the reaction pressure inside the fixed fluidized bed. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the structure of this utility model;

[0013] Figure 2 is a structural schematic diagram of this utility model from another perspective;

[0014] Figure 3 is a schematic diagram of the pressure compensation mechanism of this utility model;

[0015] Figure 4 is a schematic diagram of the installation of the pressing mechanism of this utility model;

[0016] Figure 5 is a schematic diagram of the pressure relief mechanism of this utility model;

[0017] Figure 6 is a schematic diagram of the internal structure of the pressure relief mechanism of this utility model.

[0018] In the diagram: 1. Fixed fluidized bed; 2. Pressure replenishing pipe; 3. Pressure replenishing tank; 4. Electric pusher cylinder; 5. Connecting plate; 6. Vertical rod; 7. Solenoid valve; 8. Pressure sensor No. 1; 9. Connecting pipe; 10. Pressure relief pipe; 11. Pressure relief tank; 12. Circulation pipe No. 1; 13. Circulation pipe No. 2; 14. Supplementing pipe; 15. Protruding pipe; 16. Pressure sensor No. 2; 17. Piston plate; 18. Pressure sensor No. 3; 19. Sealing plug; 20. Guide rod; 21. Spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please refer to Figures 1 to 6. In this embodiment of the present invention, a pressure stabilizing device for a reactor in the synthesis of mesitylene includes a fixed fluidized bed 1. A pressure sensor 8 is installed on the outer periphery of the fixed fluidized bed 1. The sensing end of the pressure sensor 8 is inserted into the inner cavity of the fixed fluidized bed 1. A pressure relief mechanism is installed on the outer periphery of the fixed fluidized bed 1 below the pressure sensor 8. A pressure replenishing mechanism is installed on the outer periphery of the fixed fluidized bed 1 at a position symmetrical to the pressure relief mechanism. A pressure reducing mechanism penetrating the inner cavity of the pressure replenishing mechanism is installed on the outer periphery of the pressure replenishing mechanism.

[0021] In this embodiment: First, liquid pseudotrimethylbenzene and liquid methanol are pressurized separately. Pseudotrimethylbenzene is pressurized to 0.4-0.6 MPa and heated to 300-350 degrees Celsius to become gaseous. Methanol is pressurized to 0.4-0.6 MPa and heated to 130-170 degrees Celsius to become gaseous. Then, the gaseous pseudotrimethylbenzene and methanol are fed into a fixed fluidized bed 1 for the synthesis of mesitylene under the action of a catalyst. During the synthesis process, the reaction pressure needs to be maintained at 0.3-0.5 MPa.

[0022] During the reaction process, pressure sensor 8 monitors the reaction pressure inside the fixed fluidized bed 1 in real time. When the pressure inside the fixed fluidized bed 1 is higher than the preset reaction pressure, the pressure relief mechanism opens to release the excess pressure into the pressure relief mechanism.

[0023] During the reaction, when the pressure inside the fixed fluidized bed 1 is lower than the preset reaction pressure, the pressure-reducing mechanism, in conjunction with the pressure-replenishing mechanism, replenishes the pressure inside the fixed fluidized bed 1 to ensure the reaction pressure inside the fixed fluidized bed 1.

[0024] Please refer to Figures 1, 2, 5 and 6. The pressure relief mechanism includes a connecting pipe 9 integrally formed on the outer wall of the fixed fluidized bed 1. A pressure relief pipe 10 is integrally formed on the lower outer periphery of the connecting pipe 9. A pressure relief tank 11 is installed at the output end of the pressure relief pipe 10. A pressure sensor 18 is installed at the bottom end of the pressure relief tank 11. The sensing end of the pressure sensor 18 is inserted into the inner cavity of the pressure relief tank 11. A sealing plug 19 is slidably connected to the inner wall of the connecting pipe 9. The sealing plug 19 in the reset state is located at the top opening of the pressure relief pipe 10. A guide rod 20 that penetrates to the outside of the connecting pipe 9 is fixedly installed at one end of the sealing plug 19. A spring 21 is abutted between one end of the sealing plug 19 and one end of the inner wall of the connecting pipe 9. The spring 21 is sleeved on the outer periphery of the guide rod 20.

[0025] In this embodiment: when the reaction pressure inside the fixed fluidized bed 1 is greater than the preset maximum reaction pressure, the pressure acts on the sealing plug 19 through the connecting pipe 9. The sealing plug 19 is pushed by the force to slide the guide rod 20. At this time, the spring 21 is compressed. The moved sealing plug 19 is misaligned with the pressure relief pipe 10. The excess pressure enters the interior of the pressure relief tank 11 through the pressure relief pipe 10, so as to prevent the pressure inside the fixed fluidized bed 1 from exceeding the preset maximum reaction pressure.

[0026] Please refer to Figures 1, 2, 3 and 4. The pressure replenishment mechanism includes a pressure replenishment pipe 2 welded to the outer periphery of the fixed fluidized bed 1. A solenoid valve 7 is installed on the horizontal section of the pressure replenishment pipe 2. A pressure replenishment tank 3 is installed on the top of the pressure replenishment pipe 2. A downwardly protruding protruding pipe 15 is integrally formed on one side of the pressure replenishment pipe 2 below the pressure replenishment tank 3. A second pressure sensor 16 is installed at the bottom end of the protruding pipe 15. The inner cavity of the second pressure sensor 16 is connected to the inner cavity of the pressure replenishment tank 3. The sensing end of the second pressure sensor 16 is located in the inner cavity of the protruding pipe 15. The solenoid valve 7 and the first pressure sensor 8 are electrically connected through a controller.

[0027] In this embodiment: when the reaction pressure inside the fixed fluidized bed 1 is less than the preset minimum pressure, the first pressure sensor 8 sends an electrical signal to the controller. The controller controls the solenoid valve 7 to open and controls the pressing mechanism to operate. At this time, the pressing mechanism pushes the gas inside the pressure tank 3 downward and presses it into the fixed fluidized bed 1 through the pressure tank 2. When the pressure inside the fixed fluidized bed 1 reaches the preset pressure, the first pressure sensor 8 sends an electrical signal to the controller. The controller controls the solenoid valve 7 to close and simultaneously controls the pressing mechanism to reset.

[0028] Please refer to Figures 1, 2, 3 and 4. The pressing mechanism includes an electric push cylinder 4 fixedly installed on the outer periphery of the pressure tank 3. A connecting plate 5 is installed on the top of the piston rod of the electric push cylinder 4. A vertical rod 6 that penetrates into the inner cavity of the pressure tank 3 is fixedly installed on one side of the bottom end of the connecting plate 5. A piston plate 17 is installed at the bottom end of the vertical rod 6. The piston plate 17 is located in the inner cavity of the pressure tank 3.

[0029] In this embodiment: when the pressure inside the fixed fluidized bed 1 is less than the reaction pressure, the controller controls the electric push cylinder 4 to move downward. The electric push cylinder 4 drives the connecting plate 5 to move downward, the connecting plate 5 drives the vertical rod 6 to move downward, and the vertical rod 6 drives the piston plate 17 to move downward, so that the gas in the pressure tank 3 is forced into the fixed fluidized bed 1 through the pressure pipe 2.

[0030] Once the pressure inside the fixed fluidized bed 1 reaches the reaction pressure, the electric pusher cylinder 4 can be reset under the control of the controller.

[0031] Please refer to Figures 3, 4, 5 and 6. The outer circumference of the pressure tank 3 is integrally formed with a protruding No. 2 circulation pipe 13 and a replenishment pipe 14. The outer circumference of the pressure relief tank 11 is integrally formed with a protruding No. 1 circulation pipe 12. The No. 1 circulation pipe 12 and the No. 2 circulation pipe 13 are connected through a No. 1 pipe. A No. 1 air pump and a No. 1 valve are installed in the middle section of the No. 1 pipe. The replenishment pipe 14 is connected to the external raw material heating tank through a No. 2 pipe, and a No. 2 air pump and a No. 2 valve are installed in the middle section of the pipe.

[0032] In this embodiment: after excess pressure enters the pressure relief pipe 10, the third pressure sensor 18 monitors the pressure in the pressure relief tank 11 in real time. When the pressure exceeds the preset pressure, the third pressure sensor 18 sends an electrical signal to the controller. The controller controls the first air pump and the first valve to open, and transports the gas in the pressure relief tank 11 to the pressure replenishment tank 3. After the pressure in the pressure relief tank 11 drops to the preset pressure, the second pressure sensor 16 sends an electrical signal to the controller. The controller controls the first air pump and the first valve to close, so as to avoid the pressure in the pressure relief tank 11 being too high and causing pressure backflow into the fixed fluidized bed 1 when the sealing plug 19 is opened.

[0033] When the pressure in the pressure tank 3 is insufficient to provide additional pressure, the second pressure sensor 16 sends an electrical signal, and the controller controls the second air pump and the second valve to open. The second air pump draws external gasified raw materials into the pressure tank 3 to maintain the pressure in the pressure tank 3. When the pressure in the pressure tank 3 reaches the preset pressure range, the second pressure sensor 16 sends an electrical signal to the controller, and the controller then controls the second air pump and the second valve to close. It should be noted that both the first valve and the second valve are electromagnetic valves.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A reactor pressure stabilizing device for the synthesis of mesitylene, comprising a fixed fluidized bed (1), characterized in that, A pressure sensor (8) is installed on the outer periphery of the fixed fluidized bed (1). The sensing end of the pressure sensor (8) is inserted into the inner cavity of the fixed fluidized bed (1). A pressure relief mechanism is installed on the outer periphery of the fixed fluidized bed (1) below the pressure sensor (8). A pressure replenishing mechanism is installed on the outer periphery of the fixed fluidized bed (1) at a position symmetrical to the pressure relief mechanism. A pressure reducing mechanism that penetrates the inner cavity is installed on the outer periphery of the pressure replenishing mechanism.

2. The reactor pressure stabilizing device for the synthesis of mesitylene according to claim 1, characterized in that, The pressure relief mechanism includes a connecting pipe (9) integrally formed on the outer wall of the fixed fluidized bed (1), a pressure relief pipe (10) integrally formed on the lower outer periphery of the connecting pipe (9), a pressure relief tank (11) installed at the output end of the pressure relief pipe (10), a No. 3 pressure sensor (18) installed at the bottom end of the pressure relief tank (11), the sensing end of the No. 3 pressure sensor (18) is inserted into the inner cavity of the pressure relief tank (11), a sealing plug (19) is slidably connected to the inner wall of the connecting pipe (9), the sealing plug (19) in the reset state is located at the top opening of the pressure relief pipe (10), a guide rod (20) is fixedly installed at one end of the sealing plug (19) and extends to the outside of the connecting pipe (9), a spring (21) is abutted between one end of the sealing plug (19) and one end of the inner wall of the connecting pipe (9), and the spring (21) is sleeved on the outer periphery of the guide rod (20).

3. The reactor pressure stabilizing device for the synthesis of mesitylene according to claim 2, characterized in that, The pressure replenishing mechanism includes a pressure replenishing pipe (2) welded to the outer periphery of the fixed fluidized bed (1). A solenoid valve (7) is installed on the horizontal section of the pressure replenishing pipe (2). A pressure replenishing tank (3) is installed on the top of the pressure replenishing pipe (2). A downwardly protruding protruding pipe (15) is integrally formed on one side of the pressure replenishing pipe (2) below the pressure replenishing tank (3). A second pressure sensor (16) is installed at the bottom end of the protruding pipe (15). The inner cavity of the second pressure sensor (16) is connected to the inner cavity of the pressure replenishing tank (3). The sensing end of the second pressure sensor (16) is located in the inner cavity of the protruding pipe (15). The solenoid valve (7) and the first pressure sensor (8) are electrically connected through a controller.

4. The reactor pressure stabilizing device for the synthesis of mesitylene according to claim 3, characterized in that, The pressing mechanism includes an electric push cylinder (4) fixedly installed on the outer periphery of the pressure tank (3). A connecting plate (5) is installed on the top of the piston rod of the electric push cylinder (4). A vertical rod (6) penetrating into the inner cavity of the pressure tank (3) is fixedly installed on one side of the bottom end of the connecting plate (5). A piston plate (17) is installed at the bottom end of the vertical rod (6). The piston plate (17) is located in the inner cavity of the pressure tank (3).

5. A reactor pressure stabilizing device for the synthesis of mesitylene according to claim 4, characterized in that, The outer circumference of the pressure replenishing tank (3) is integrally formed with an outwardly protruding No. 2 circulation pipe (13) and a replenishing pipe (14). The outer circumference of the pressure relief tank (11) is integrally formed with an outwardly protruding No. 1 circulation pipe (12). The No. 1 circulation pipe (12) and the No. 2 circulation pipe (13) are connected through a No. 1 pipe. A No. 1 air pump and a No. 1 valve are installed in the middle section of the No. 1 pipe. The replenishing pipe (14) is connected to an external raw material heating tank through a No. 2 pipe, and a No. 2 air pump and a No. 2 valve are installed in the middle section of the pipe.

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