Pressure vessel for preparing chemical intermediate

Abstract

The utility model relates to the technical field of chemical engineering, and discloses a pressure vessel for preparing a chemical intermediate, which comprises a pressure vessel main body, a feed pipe and a discharge pipe are arranged on the pressure vessel main body, and an oil bath interlayer is sleeved on the outer circumference of the pressure vessel main body; a first motor is arranged on the pressure vessel main body; an output shaft of the first motor is in transmission connection with the linkage mechanism; a rotating shaft is rotationally connected in the pressure vessel main body and is in transmission connection with the linkage mechanism; stirring components are mounted on the rotating shafts; a driving assembly is arranged in the pressure vessel main body and is in transmission fit with the linkage mechanism; an air inlet pipe is slidably arranged in the pressure vessel main body; a one-way valve is arranged in the air inlet pipe; the air inlet pipe is connected with the ventilation disc which is provided with ventilation holes, and the air inlet pipe is communicated with the ventilation holes. The ventilation disc is in transmission connection with the driving assembly and used for driving the ventilation disc to move. The driving assembly is arranged to drive the ventilation disc to move in the pressure container, so that oxygen can be in contact with raw materials at different positions, the reaction is more sufficient, and the preparation efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical intermediate preparation, and particularly relates to a pressure vessel for chemical intermediate preparation. Background Technique

[0002] A pressure vessel is a sealed container that can withstand pressure. Pressure vessels have extremely wide applications and play an important role in many sectors such as industry, civil use, military, and many fields of scientific research. Among them, they are most used in the chemical industry and petrochemical industry, such as the preparation of chemical intermediates. With the development of technology, various pressure vessels have been developed, and the reaction kettle is one of them. By installing some other equipment on the pressure vessel, more functions can be achieved, such as installing a ventilation pipe for ventilation, installing a stirring mechanism for stirring, etc. The preparation of 3,4,5,6-tetrahydrophthalic anhydride needs to be carried out in a pressure vessel, and oxygen needs to be introduced into the pressure vessel during the oxidation and crude preparation process.

[0003] A thermal reaction kettle for the preparation of lipidized essence with the publication number of CN210097654U includes a rectification tower body, including a kettle body. The kettle body is provided with a feeding port and a discharging port. The outside of the kettle body is covered with an oil bath interlayer, and a stirring part extends into the kettle body; the stirring part includes a driving motor, a stirring rod axially connected to the driving motor, and a special-shaped stirring paddle fixed on the stirring rod; the kettle body is also provided with an oxygen inlet pipe extending from the outside to its inside, and the outlet end of the oxygen inlet pipe is provided with a cross-shaped ventilation disk, and a support one connecting the inner wall of the kettle body is arranged on the cross-shaped ventilation disk; a cleaning liquid inlet part is also communicated with the oxygen inlet pipe; the kettle body is provided with an exhaust pipe communicating with its inside.

[0004] The reaction kettle with the publication number of CN208032558U includes a kettle body, a feeding port, a discharging port, a motor, a rotating shaft and a stirring device. The feeding port is arranged at the top of the kettle body, the discharging port is arranged at the bottom of the kettle body, the motor is arranged at the top end outside the kettle body, the rotating shaft and the stirring device are arranged inside the kettle body, the upper end of the rotating shaft passes through the kettle body and is connected with the motor, and the lower end is connected with the stirring device. The rotating shaft is arranged at the axis of the kettle body; there is a sealed interlayer between the inner wall and the outer wall of the kettle body, and a spiral heating pipe is arranged inside the interlayer. The heating pipe is arranged around the circumference of the inner wall of the kettle body. An air inlet pipe and an air outlet pipe are arranged outside the kettle body, and the air inlet pipe and the air outlet pipe are respectively connected to both ends of the heating pipe.

[0005] Based on the above technical features, the problem that arises is that in the prior art, the position of the air inlet pipe at the gas outlet in the pressure vessel is fixed relative to the pressure vessel and cannot be moved. When the reactants are not stirred or the stirring is not supplemented, the reactants far away from the gas outlet position cannot contact the gas and react, which leads to insufficient reaction between the reactants and reduced preparation efficiency.

[0006] Therefore, it is necessary to solve the above problems by using a spare pressure vessel of a chemical intermediate system. Summary of the invention

[0007] The utility model aims to provide a spare pressure vessel for chemical intermediate production to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure vessel for use in a chemical intermediate system, comprising a pressure vessel body, on which a feed pipe and a discharge pipe are fixedly arranged; an oil bath interlayer is fixedly sleeved on the outer circumference of the pressure vessel body; a first motor is fixedly arranged on the top of the pressure vessel body, and a linkage mechanism is connected to the output shaft of the first motor; a rotating shaft is rotatably connected in the pressure vessel body, and the rotating shaft is transmission-connected to the linkage mechanism; a stirring assembly is fixedly installed on the rotating shaft; a driving assembly is arranged in the pressure vessel body, and the driving assembly is transmission-coordinated with the linkage mechanism; an air inlet pipe is slidably arranged in the pressure vessel body, and a one-way valve is fixedly arranged in the air inlet pipe; the air inlet pipe is fixedly connected to a vent disk, a plurality of air holes are provided on the vent disk, and the air inlet pipe is connected to the air holes; the vent disk is transmission-connected to the driving assembly to drive the vent disk to move.

[0009] Preferably, the linkage mechanism includes a first gear, a second gear and a third gear; the second gear is fixedly sleeved on the output shaft of the first motor, and the first gear and the third gear are both meshed with the second gear; the first gear is coaxially fixedly connected to the rotating shaft, and the third gear is transmission connected to the driving assembly.

[0010] Preferably, the driving assembly includes a first threaded rod, the first threaded rod is rotatably connected to the pressure vessel body; the first threaded rod is coaxially fixedly connected to the third gear; and the first threaded rod is threadedly connected to the ventilation disk.

[0011] Preferably, the stirring assembly includes a plurality of stirring blades, and the plurality of stirring blades are fixedly arranged on the outer circumference of the rotating shaft.

[0012] Preferably, the stirring assembly includes a support box fixedly arranged on the rotating shaft; a second motor is fixedly installed in the support box, and the output shaft of the second motor is coaxial with the rotating shaft; a second threaded rod is coaxially and fixedly connected to the output shaft of the second motor, a moving disc is threadedly connected to the second threaded rod, and a plurality of stirring blades are fixedly arranged on the outer circumference of the moving disc; a sliding rod is fixedly arranged on the support box, and the sliding rod is in limit sliding fit with the moving disc.

[0013] Preferably, a flip cover is assembled on the feed pipe, and a valve is fixedly arranged in the discharge pipe.

[0014] Preferably, a temperature detector is fixedly arranged on the main body of the pressure vessel.

[0015] Preferably, a water inlet pipe is fixedly connected to the air inlet pipe, and the water inlet pipe is communicated with the air inlet pipe.

[0016] Preferably, an exhaust pipe is fixedly connected to the main body of the pressure vessel, and a check valve is fixedly arranged in the exhaust pipe.

[0017] The technical effects and advantages of the present utility model:

[0018] First, the present utility model is provided with a driving assembly, and the driving assembly drives the ventilation disc to move in the pressure vessel, so as to change the position of the ventilation disc in the pressure vessel, and further enable the oxygen ejected from the ventilation disc to contact the raw materials for reaction at different positions, making the raw material reaction more sufficient and improving the preparation efficiency.

[0019] Second, the present utility model is provided with a linkage mechanism, and the linkage mechanism enables the stirring process and the moving process of the ventilation disc to be interconnected. While the stirring and mixing are more sufficient, the raw material reaction is also more sufficient, and the preparation efficiency is higher. Description of the drawings

[0020] Figure 1 is a schematic three-dimensional structure diagram of Embodiment 1 of the present utility model;

[0021] Figure 2 is a schematic internal structure diagram of Embodiment 1 of the present utility model;

[0022] Figure 3 is a schematic internal structure diagram of Embodiment 2 of the present utility model.

[0023] In the figure: 1. Pressure vessel main body; 2. Inlet pipe; 3. Feed pipe; 4. Water inlet pipe; 5. Check valve; 6. Flip cover; 7. Rotating shaft; 8. First gear; 9. Second gear; 10. First motor; 11. Third gear; 12. First threaded rod; 13. Temperature detector; 14. Discharge pipe; 15. Oil bath interlayer; 16. Ventilation disc; 17. Stirring blade; 18. Second threaded rod; 19. Slide bar; 20. Support box; 21. Second motor; 22. Exhaust pipe. Detailed implementation manner

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1:

[0026] The present invention provides a pressure vessel for preparing chemical intermediates as shown in Figures 1 to 2 The pressure vessel includes a cylindrical pressure vessel main body 1 with a reaction chamber formed inside. A circular oil bath interlayer 15 is fixedly sleeved on the outer circumference of the pressure vessel main body 1 for heating. A feed pipe 3 for adding raw materials is fixedly installed on the top of the pressure vessel main body 1, and a flip cover 6 is installed on the feed pipe 3. A discharge pipe 14 for discharging the prepared material is fixedly installed at the lower end of the pressure vessel main body 1, and a valve is fixedly installed inside the discharge pipe 14. A temperature detector 13 is fixedly installed at the top of the pressure vessel main body 1, and the probe of the temperature detector 13 is inserted into the reaction chamber inside the pressure vessel main body 1 for detecting the temperature.

[0027] A first motor 10 is bolted to the top of the pressure vessel main body 1, and the output shaft of the first motor 10 is vertically upward. A linkage mechanism is connected to the output shaft of the first motor 10 in a driving manner. The linkage mechanism includes a first gear 8, a second gear 9, and a third gear 11. Among them, the second gear 9 is fixedly sleeved on the output shaft of the first motor 10, the first gear 8 is meshed and fitted on the left side of the second gear 9, and the third gear 11 is meshed and fitted on the right side of the second gear 9.

[0028] The bottom of the first gear 8 is coaxially fixed with a rotating shaft 7. The rotating shaft 7 coaxially passes downward through the top end of the pressure vessel main body 1 and extends into the reaction chamber. The rotating shaft 7 is rotatably connected to the pressure vessel main body 1, and the bottom of the rotating shaft 7 is rotatably inserted into the bottom end of the pressure vessel main body 1. The rotating shaft 7 is drivingly connected to a stirring assembly, and the stirring assembly includes a plurality of stirring blades 17 evenly distributed on the rotating shaft 7. Each stirring blade 17 is fixedly connected to the rotating shaft 7. The stirring assembly is used to mix the reaction materials, which has the function of accelerating the reaction rate and making the reaction more complete.

[0029] The third gear 11 is drivingly connected to a driving assembly, and the driving assembly includes a first threaded rod 12. The first threaded rod 12 is coaxially fixed to the bottom of the third gear 11. The first threaded rod 12 passes downward through the top end of the pressure vessel main body 1 and extends into the reaction chamber. The first threaded rod 12 is rotatably connected to the pressure vessel main body 1, and the bottom of the first threaded rod 12 is rotatably inserted into the bottom end of the pressure vessel main body 1.

[0030] The first threaded rod 12 is threadedly connected to a ventilation disk 16. The ventilation disk 16 is an annular disk. The ventilation disk 16 is coaxial with the pressure vessel main body 1 and is located inside the pressure vessel main body 1. The first threaded rod 12 can push the ventilation disk 16 to move up and down along the axis of the pressure vessel main body 1. And the horizontal length of any stirring blade 17 in the radial direction of the rotating shaft 7 is less than the radius of the inner circumference of the ventilation disk 16. The process of the ventilation disk 16 moving up and down and the process of the stirring blade 17 rotating with the rotating shaft 7 do not affect each other.

[0031] An inlet pipe 2 is fixedly connected to the ventilation disk 16. A plurality of air-permeable holes for passing oxygen are drilled in the ventilation disk 16. The inlet pipe 2 is connected to the ventilation holes through a gas flow passage reserved inside the ventilation disk 16. The inlet pipe 2 vertically slides upward through the top end of the pressure vessel main body 1 and is in sealed sliding fit with the pressure vessel main body 1. A one-way valve 5 is fixedly assembled inside the inlet pipe 2. The one-way valve 5 is used to prevent gas backflow. A water inlet pipe 4 is fixedly connected to the inlet pipe 2 below the one-way valve 5. Through the water inlet pipe 4, washing liquid for cleaning can be introduced into the inlet pipe 2, the ventilation disk 16 and the pressure vessel main body 1. A valve is fixedly assembled inside the water inlet pipe 4 to close and open the water inlet pipe 4. The water inlet pipe 4 is located above the outside of the pressure vessel main body 1. The water inlet pipe 4 does not come into contact with or collide with the outer surface of the pressure vessel main body 1 during the process of moving up and down with the inlet pipe 2.

[0032] The top of the inlet pipe 2 is connected to the air outlet of an oxygen generator. The top of the pressure vessel main body 1 is fixedly connected to an exhaust pipe 22. A one-way valve is also fixedly assembled inside the exhaust pipe 22 to ensure that the waste gas generated during the reaction can only be discharged from inside the pressure vessel main body 1 to the outside.

[0033] The working principle of Embodiment 1:

[0034] Before use, the ventilation disk 16 is located at the bottom of the reaction chamber inside the pressure vessel main body 1. The valves in the discharge pipe 14 and the water inlet pipe 4 are both in the closed state.

[0035] During use, close the valve of the discharge pipe 14, then flip the cover 6 to open the opening of the feed pipe 3, and add the raw materials for the reaction into the reaction chamber of the pressure vessel main body 1 through the feed pipe 3. After the raw materials are added, flip the cover 6 again to close the opening of the feed pipe 3. At this time, the raw materials come into contact with the ventilation disk 16 and the stirring blades 17.

[0036] At the same time, the oil bath interlayer 15 starts to work. The oil bath interlayer 15 raises the temperature in the reaction chamber of the pressure vessel main body 1 until it reaches the appropriate reaction temperature and keeps the temperature in the reaction chamber constant. The temperature can be detected by the temperature detector 13. At this time, the oxygen generator starts to supply gas into the ventilation disk 16 through the air inlet pipe 2, and the oxygen contacts the reaction raw materials through the ventilation holes on the ventilation disk 16 via the gas flow path and undergoes a chemical reaction.

[0037] Subsequently, start the first motor 10. The output shaft of the first motor 10 drives the second gear 9 to rotate, and the second gear 9 drives the first gear 8 and the third gear 11 to rotate respectively. At this time, the first gear 8 drives the rotating shaft 7 to rotate, and the rotating shaft 7 drives the stirring blades 17 in the stirring assembly to rotate, thereby stirring and mixing the raw materials for the reaction.

[0038] Meanwhile, the third gear 11 drives the first threaded rod 12 to rotate, and the rotation of the first threaded rod 12 causes the ventilation disk 16 to move axially along the first threaded rod 12. By controlling the forward and reverse rotation of the output shaft of the first motor 10, the ventilation disk 16 moves up and down axially along the pressure vessel main body 1. During the up and down movement of the ventilation disk 16, it will come into contact with more raw materials for the reaction, thereby enabling the oxygen to contact and react with the raw materials for the reaction at different positions. This prevents the oxygen from reacting only with the raw materials at fixed positions.

[0039] During the up and down movement of the ventilation disk 16, it will drive the air inlet pipe 2 to move up and down synchronously.

[0040] The waste gas generated during the reaction will be discharged from the pressure vessel main body 1 through the exhaust pipe 22. After the reaction is completed, open the valve of the discharge pipe 14, and take out the reaction product and the chemical intermediate 3,4,5,6 - tetrahydrophthalic anhydride from the reaction chamber through the discharge pipe 14. The preparation process is over.

[0041] When it is necessary to clean the inside of the pressure vessel main body 1, open the valve inside the water inlet pipe 4, inject the washing liquid for cleaning into the pressure vessel main body 1 through the water inlet pipe 4, rinse the inside of the pressure vessel main body 1, and the waste water will be discharged through the discharge pipe 14 after rinsing. After washing, close the valves in the discharge pipe 14 and the water inlet pipe 4.

[0042] Example 2

[0043] As Figure 3 shown, a pressure vessel for preparing a chemical intermediate. The difference between this embodiment and Embodiment 1 is that the stirring assembly is fixedly assembled at the bottom of the rotating shaft 7. The stirring assembly includes a support box 20. The support box 20 is a rectangular box body and is fixedly connected to the bottom of the rotating shaft 7. The center of the top end face of the support box 20 is located on the central axis of the rotating shaft 7.

[0044] A second motor 21 is fixedly bolted inside the support box 20. The output shaft of the second motor 21 vertically penetrates downward through the bottom of the support box 20 and is coaxial with the rotating shaft 7. The output shaft of the second motor 21 is rotatably connected to the support box 20. The bottom end of the output shaft of the second motor 21 is coaxially fixed with a second threaded rod 18. The bottom of the second threaded rod 18 is rotatably inserted into the bottom end of the pressure vessel body 1.

[0045] The second threaded rod 18 is a bidirectional screw rod, and the threads on the upper and lower sides are both reciprocating threads. Two moving discs are threadedly connected to the second threaded rod 18. Three stirring blades 17 are evenly welded on the outer circumferences of the two moving discs. The two moving discs are respectively arranged on the upper and lower sides of the second threaded rod 18 and are coaxial with the second threaded rod 18. The second threaded rod 18 is used to push the two moving discs to drive the stirring blades 17 to move up and down, and the rotating shaft 7 is used to drive the stirring blades 17 to rotate around the central axis.

[0046] A sliding rod 19 is also fixedly connected to the bottom of the support box 20. The sliding rod 19 vertically penetrates downward through the two moving discs in sequence and is in sliding contact with the bottom end of the pressure vessel body 1. The sliding rod 19 drives the two moving discs to revolve around the central axis of the rotating shaft 7. The two moving discs are in limiting sliding fit with the sliding rod 19. The sliding rod 19 is used for guiding the two moving discs and at the same time limiting the two moving discs.

[0047] Working principle of Example 2:

[0048] Since the only difference between Example 2 and Embodiment 1 is the stirring assembly, only the working principle of the stirring process will be described below, and the other working processes are the same as those in Embodiment 1.

[0049] After the first motor 10 is started, the first gear 8 drives the rotating shaft 7 to rotate, and the rotating shaft 7 drives the support box 20 to rotate. The rotation of the support box 20 drives both the second motor 21 to rotate around the central axis of the rotating shaft 7 and the sliding rod 19 to rotate around the central axis of the rotating shaft 7. When the second motor 21 is not started, the output shaft of the second motor 21 drives the second threaded rod 18 to rotate around the central axis of the rotating shaft 7. At this time, the sliding rod 19 drives the two moving disks to rotate around the central axis of the rotating shaft 7, so that the two moving disks drive their respective connected stirring blades 17 to stir and mix the raw materials for the reaction. When the second motor 21 is started, the output shaft of the second motor 21 drives the second threaded rod 18 to rotate around its own axis. At this time, the second threaded rod 18 pushes the two moving disks to drive the stirring blades 17 to move towards or away from each other along the axial direction of the second threaded rod 18, thereby further deeply stirring and mixing the raw materials for the reaction.

[0050] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure vessel for use in a chemical intermediate system, comprising a pressure vessel body (1), on which a feed pipe (3) and a discharge pipe (14) are fixedly arranged; an oil bath interlayer (15) is fixedly sleeved on the outer circumference of the pressure vessel body (1); characterized in that: A first motor (10) is fixedly arranged on the top of the pressure vessel body (1), and the output shaft of the first motor (10) is transmission-connected to a linkage mechanism; a rotating shaft (7) is rotatably connected inside the pressure vessel body (1), and the rotating shaft (7) is transmission-connected to the linkage mechanism; a stirring assembly is fixedly installed on the rotating shaft (7); a driving assembly is arranged inside the pressure vessel body (1), and the driving assembly is transmission-coordinated with the linkage mechanism; an air intake pipe (2) is slidingly arranged inside the pressure vessel body (1), and a one-way valve (5) is fixedly arranged inside the air intake pipe (2); the air intake pipe (2) is fixedly connected to a vent plate (16), and a plurality of vent holes are provided on the vent plate (16), and the air intake pipe (2) is connected to the vent holes; the vent plate (16) is transmission-connected to the driving assembly, and is used to drive the vent plate (16) to move.

2. A pressure vessel for use as a standby in a chemical intermediate system according to claim 1, characterized in that: The linkage mechanism comprises a first gear (8), a second gear (9) and a third gear (11); the second gear (9) is fixedly sleeved on the output shaft of the first motor (10), and the first gear (8) and the third gear (11) are both meshed with the second gear (9); the first gear (8) is coaxially fixedly connected to the rotating shaft (7), and the third gear (11) is transmission-connected to the driving assembly.

3. A pressure vessel for use as a standby in a chemical intermediate system according to claim 2, characterized in that: The driving assembly comprises a first threaded rod (12), the first threaded rod (12) being rotatably connected to the pressure vessel body (1); the first threaded rod (12) being coaxially fixedly connected to the third gear (11); and the first threaded rod (12) being threadedly connected to the vent plate (16).

4. The pressure vessel for use as a standby in a chemical intermediate system according to claim 1, characterized in that: The stirring assembly comprises a plurality of stirring blades (17), and the plurality of stirring blades (17) are all fixedly arranged on the outer circumference of the rotating shaft (7).

5. The pressure vessel for use as a standby in a chemical intermediate system according to claim 1, characterized in that: The stirring assembly comprises a support box (20), wherein the support box (20) is fixedly arranged on the rotating shaft (7); a second motor (21) is fixedly installed in the support box (20), and the output shaft of the second motor (21) is coaxial with the rotating shaft (7); a second threaded rod (18) is coaxially fixedly connected to the output shaft of the second motor (21), and the second threaded rod (18) is threadedly connected to a moving disc, and a plurality of stirring blades (17) are fixedly arranged on the outer circumference of the moving disc; a sliding rod (19) is fixedly arranged on the support box (20), and the sliding rod (19) is in limited sliding cooperation with the moving disc.

6. The pressure vessel for use as a standby in a chemical intermediate system according to claim 1, characterized in that: The feed pipe (3) is equipped with a flip cover (6), and a valve is fixedly arranged in the discharge pipe (14).

7. The pressure vessel for use as a standby in a chemical intermediate system according to claim 1, characterized in that: A temperature detector (13) is fixedly arranged on the pressure container body (1).

8. The pressure vessel for use as a standby in a chemical intermediate system according to claim 1, characterized in that: The air inlet pipe (2) is fixedly connected to a water inlet pipe (4), and the water inlet pipe (4) and the air inlet pipe (2) are in communication with each other.

9. The pressure vessel for use as a standby in a chemical intermediate system according to claim 1, characterized in that: An exhaust pipe (22) is fixedly connected to the pressure container body (1), and a one-way valve is fixedly arranged in the exhaust pipe (22).

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