A reaction kettle for preparing aqueous methylhydrazine solution

Abstract

The present application relates to the technical fields of reaction kettle, and discloses a reaction kettle for preparing methylhydrazine aqueous solution, which comprises a reaction kettle, a rotating shaft arranged in the reaction kettle, an end cover arranged at the top end of the reaction kettle, a stirring frame arranged on the rotating shaft, the stirring frame comprising an upper cross beam, a lower cross beam and a connecting rod, the two ends of the connecting rod being connected with the upper cross beam and the lower cross beam respectively, a conveying belt arranged on the stirring frame, the conveying belt being rotatably arranged on the stirring frame, a first driving mechanism arranged on the stirring frame and used for driving the conveying belt to rotate, a discharge chute arranged on the side wall of the rotating shaft, the side of the conveying belt being abutted against the side wall of the discharge chute, the other side of the conveying belt having a gap with the side wall of the discharge chute, the rotating shaft being a hollow shaft, a screw blade being arranged in the rotating shaft, a liquid passage being arranged on the rotating shaft close to the bottom of the reaction kettle, and a discharge port being arranged at the bottom end of the reaction kettle; the reaction kettle for preparing methylhydrazine aqueous solution can separate the catalyst from the liquid after reaction.

Description

Technical Field

[0001] This invention relates to the field of reaction vessel technology, and more specifically to a reaction vessel for preparing aqueous methylhydrazine solution. Background Technology

[0002] The preparation of aqueous methylhydrazine solution involves the chemical synthesis of methylhydrazine and its dissolution in water to form a stable solution. As an important organohydrazine compound, methylhydrazine aqueous solutions have industrial applications, such as being a component of high-energy rocket fuel, a key intermediate in pharmaceutical and pesticide synthesis, and a chemical foaming agent. Its core preparation route typically involves the reaction between a methylating agent (such as chloramine, dimethyl sulfate, or nitromethane) and hydrazine or its derivatives (such as hydrazine hydrate). The use of a catalyst to prepare aqueous methylhydrazine solution is an advanced synthetic technique distinct from traditional non-catalytic routes. It involves introducing a solid or homogeneous catalyst with specific activity into the reaction system, using catalytic reduction amination as the core step to produce methylhydrazine. This method typically uses an intermediate formed by the condensation of ketones (such as acetone) with hydrazine as a key precursor. Under a hydrogen atmosphere and in the presence of a catalyst, highly efficient catalytic hydrogenation and hydrogenolysis reactions are carried out, selectively breaking C=N bonds and generating CN and NH bonds, thereby directionally converting to methylhydrazine. Catalysts are used to modify reaction pathways and significantly reduce reaction activation energy, thereby achieving milder reaction conditions, maximizing the selectivity of target products, and minimizing byproducts. This represents a technological direction towards higher atom economy and greener processes.

[0003] Chinese Patent CN115178194B discloses a catalyst reaction vessel, which includes a vessel body for catalyst reaction. The vessel body has a rotating plate inside, and a cavity is formed inside the rotating plate. From left to right, a stirring shaft, a first screw, and a second screw are arranged inside the cavity. The bottom ends of the stirring shaft, the first screw, and the second screw extend through the rotating plate into the vessel body. Multiple stirring rods are fixed to the outer wall of the stirring shaft. In use, the operator first feeds the catalyst reaction material into the vessel body through a feeding pipe, and then uses a controller to start a first motor. The first motor drives the rotating plate to rotate inside the vessel body via a connecting shaft. As the rotating plate rotates, it drives the stirring shaft, the first screw, and the second screw to rotate inside the vessel body. The first gear on the stirring shaft meshes with multiple first tooth grooves on the inner wall of the first ring plate and rotates, thereby driving the stirring shaft to rotate as well. The stirring rods on the stirring shaft rotate while performing an eccentric motion, fully stirring the catalyst reaction material inside the vessel body. Simultaneously, driven by two sets of sprockets and chains, the first screw and the second screw follow the stirring... The mixing shafts rotate together. Because the spiral grooves on the first and second screws are set in opposite directions, the first screw conveys the catalyst reaction material located at the bottom of the inner cavity of the vessel upwards, while the second screw conveys the catalyst reaction material located at the top of the inner cavity of the vessel downwards. This ensures a continuous flow of the catalyst reaction material within the vessel. Combined with the rotation of the stirring rod on the mixing shaft, this greatly increases the mixing speed of the catalyst reaction material. Only one first motor is needed to drive the mixing shaft, the first screw, and the second screw to rotate simultaneously. After the mixing reaction is completed, the solenoid valve on the discharge pipe is opened to discharge the material. After use, the operator uses the controller to operate the four hydraulic cylinders to extend. The hydraulic cylinders push the third ring plate upwards, which in turn pushes the cover plate upwards, thereby removing the mixing shaft, the first screw, and the second screw from the inside of the vessel. Then, the operator can remove the cover plate from the third ring plate as needed to clean the mixing shaft, the first screw, and the second screw. At the same time, the operator can loosen the multiple bolts between the sealing plate and the vessel body, remove the sealing plate, and clean the inside of the vessel.

[0004] The aforementioned patent uses a stirring rod to stir the materials inside the reactor, thereby rotating the catalyst reaction material inside the reactor. This, combined with the stirring shaft, the first screw, and the second screw, further improves the mixing effect of the catalyst reaction material.

[0005] However, after the reaction is complete, the product needs to be separated from the catalyst. The above-mentioned patent requires unscrewing multiple bolts between the sealing plate and the vessel body at the same time, and then disassembling the sealing plate in order to clean the inside of the vessel body. The cleaning process is quite complicated. Summary of the Invention

[0006] This invention provides a reaction vessel for the preparation of aqueous methylhydrazine, aiming to solve the problem of the complex cleaning process inside the vessel after the reaction is completed in related technologies.

[0007] A reaction vessel for preparing an aqueous solution of methylhydrazine according to the present invention includes: a reaction vessel;

[0008] The reactor is equipped with a rotating shaft, and the top of the reactor is equipped with an end cap. The rotating shaft is equipped with a stirring rack, which includes an upper crossbeam, a lower crossbeam, and a connecting rod. The upper crossbeam and the lower crossbeam are distributed parallel to each other at intervals. The two ends of the connecting rod are respectively connected to the upper crossbeam and the lower crossbeam.

[0009] The stirring rack is equipped with a conveyor belt, which is rotatably fitted onto the stirring rack. The stirring rack is equipped with a first driving mechanism for driving the conveyor belt to rotate. The side wall of the rotating shaft is equipped with a discharge trough. One side of the conveyor belt abuts against the side wall of the discharge trough, and there is a gap between the other side of the conveyor belt and the side wall of the discharge trough. The rotating shaft is a hollow shaft with auger blades inside. The side wall of the rotating shaft near the bottom of the reactor is equipped with a liquid passage hole. The bottom end of the reactor is equipped with a discharge port, and the rotating shaft is connected to the discharge port.

[0010] After the reaction is complete, the rotating shaft starts, driving the connected conveyor belt to rotate around the shaft. During this rotation, under the pressure of the liquid, the catalyst particles are tightly adhered to the surface of the conveyor belt. Subsequently, the first drive mechanism starts working, providing continuous and stable power to the conveyor belt to maintain stable operation. During operation, the conveyor belt gradually transports the loaded catalyst particles to the discharge trough area, and through this trough structure, guides them into the internal space of the rotating shaft. Simultaneously, the auger blades installed inside the rotating shaft rotate synchronously with the shaft, using their spiral structure to continuously push the working fluid and catalyst particles entering the shaft downwards. During this process, a small amount of working fluid and some catalyst particles are discharged through the discharge port, while the remaining working fluid, under pressure, flows back into the reactor through the liquid passages on the rotating wall, thus discharging the catalyst particles. Subsequent cleaning of the reactor only requires rinsing with clean water, avoiding the need for disassembly and cleaning of the reactor.

[0011] Preferably, the first drive mechanism includes a drive shaft, a driven shaft, and a drive gear. Mounting plates are provided on both the upper and lower crossbeams. The drive shaft and the driven shaft are spaced apart and rotatably engage with the mounting plates. The two ends of the conveyor belt are respectively sleeved on the drive shaft and the driven shaft and are in frictional engagement with them. The conveyor belt is located between the two mounting plates. The drive gear is fixedly connected to the drive shaft. A first gear is provided on the rotating shaft, and the drive gear can mesh with the first gear.

[0012] By defining the first drive mechanism as including a drive shaft, a driven shaft, and a gear meshing structure, the transmission stability and energy utilization of the separation mechanism are improved. In the high-intensity stirring environment of methylhydrazine preparation, the spaced distribution of the drive shaft and driven shaft, combined with the mounting plate, ensures that the conveyor belt maintains a constant tension in the complex flow field, avoiding the decrease in separation efficiency due to slippage. Through the meshing design of the drive gear and the first gear on the rotating shaft, the mechanical linkage between the revolution of the rotating shaft and the rotation of the conveyor belt is realized. Only one set of active power source is needed to simultaneously complete the global stirring and local catalyst capture actions, simplifying the internal structure, reducing the sealing risks caused by the introduction of multiple motors, ensuring that the speed of the conveyor belt sweeping across the liquid surface and the catalyst adsorption rate reach a physical balance, and improving the continuity of separation.

[0013] Preferably, the rotating shaft is further provided with a second driving mechanism, which includes a driving seat, a driving ring, a hinge rod, and a driving component. The driving seat is slidably fitted on the rotating shaft, the driving ring is slidably fitted on the driving seat, one end of the hinge rod is hinged to the mounting plate, and the other end is hinged to a connecting block. The connecting block is slidably fitted with the driving ring and can move circumferentially along the driving ring. The driving component is provided on the end cover, and the output end of the driving component is connected to the driving seat. An elastic element is provided between the driving seat and the driving ring. The mounting plate is slidably fitted with the corresponding upper or lower crossbeam. The second driving mechanism is used to drive the mounting plate to move radially along the reactor.

[0014] Through the linkage of the drive seat, drive ring, and hinge rod, the mounting plate can change its radial position within the reactor according to different stages of the reaction. In the initial stage of the reaction, by expanding the mounting plate outwards, the gap between the conveyor belt and the rotating shaft increases. This not only expands the stirring coverage area but, more importantly, creates a high-speed shear flow zone between the conveyor belt and the shaft, significantly accelerating the circulation speed of the working fluid and thus improving reaction efficiency. In the later stages of the reaction, when separation is required, adjusting the mechanism to change the angle of attack of the conveyor belt allows it to target areas with higher catalyst concentrations. This enables the reactor to be dynamically optimized for methylhydrazine working fluids of different viscosities, maximizing the efficiency of both the reaction and separation processes.

[0015] Preferably, the stirring rack is equipped with a scraper, which can abut against the inner wall of the reactor.

[0016] By installing scrapers at the outer end of the stirring rack that abut against the inner wall, a full-circumference sweep is achieved as the rotating shaft rotates. This not only forcibly peels off particles adhering to the wall in real time, causing them to re-enter a suspended state for capture by the conveyor belt, but also acts as a mechanical pump, pushing material from the edges towards the center. The scrapers also improve the heat exchange coefficient of the reactor wall, preventing localized overheating. From a process perspective, the division of labor between the scrapers and the conveyor belt forms a closed loop: the scrapers are responsible for peeling off the falling material, while the conveyor belt is responsible for capturing and transporting it. Their cooperation ensures zero catalyst accumulation inside the reactor, greatly extending the continuous operation cycle of the reactor and reducing the time and cost of subsequent shutdown cleaning.

[0017] Preferably, the end cap is provided with an air inlet, the rotating shaft is provided with an air inlet chamber, the air inlet is connected to the air inlet chamber, the upper crossbeam and the connecting rod are provided with a first air inlet channel, the air inlet chamber is connected to the first air inlet channel, the side wall of the connecting rod is provided with a plurality of first air outlets, the first air outlets are connected to the first air inlet channel, and the plurality of first air outlets are distributed vertically at intervals on the side wall of the stirring rack.

[0018] Hydrogen enters the intake chamber through the inlet and then enters the first ventilation channel. Finally, it is discharged from the first outlet. Hydrogen can mix with the working fluid at different heights, so that the upper and lower parts of the working fluid can react with hydrogen evenly, which is conducive to the full mixing of hydrogen and working fluid.

[0019] The scraper is equipped with a baffle, and the scraper is rotatably engaged with the stirring frame via a torsion spring. The mounting plate can push the scraper to rotate, and the baffle can close the first air outlet.

[0020] The baffle prevents the working fluid from entering the first air inlet channel from the first air outlet when no air is supplied.

[0021] Preferably, both sides of the lower crossbeam are provided with flanges, both flanges are inclined downwards, the lower crossbeam and the flanges are provided with a second air intake channel, the side wall of the flange is provided with a second air outlet, both mounting plates are hollow structures, a connecting pipe is provided between the two mounting plates, the side wall of the upper crossbeam is provided with a first opening, the side wall of the lower crossbeam is provided with a second opening, and the side wall of each mounting plate is provided with a connecting port, the two connecting ports can be connected to the first opening and the second opening respectively.

[0022] Preferably, the reactor is equipped with a lifting plate, which slides in conjunction with the side wall of the reactor. The bottom of the reactor is equipped with a lifting mechanism for driving the lifting plate to move up and down.

[0023] Preferably, a first valve and a second valve are respectively provided at the discharge port, the first valve and the second valve are distributed at intervals, and the discharge port forms a discharge cavity between the first valve and the second valve.

[0024] Methylhydrazine is toxic, and the reaction usually takes place under pressure. Direct single-valve discharge can easily lead to a sudden loss of pressure inside the reactor or material splashing. By alternately opening the first and second valves, a buffer chamber is formed between them. During discharge, the upper valve is opened first to allow the catalyst to descend into the chamber, and then the upper valve is closed before the lower valve is opened to discharge. This achieves non-contact discharge, thereby ensuring a constant pressure inside the reactor, avoiding disturbance to the reaction environment, preventing the leakage of harmful gases, and realizing online, uniform, and safe discharge of the catalyst.

[0025] Preferably, an air pump is connected to the air inlet.

[0026] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0027] According to a reaction vessel for preparing an aqueous solution of methylhydrazine according to the present invention, after the reaction is completed, the rotating shaft rotates, thereby driving the conveyor belt to rotate around the rotating shaft. During the rotation, the catalyst particles will stick to the conveyor belt under pressure. The first driving mechanism drives the conveyor belt to run, and the conveyor belt sends the catalyst particles through the discharge trough into the rotating shaft. The auger blades rotate synchronously with the rotating shaft, pushing the working liquid and catalyst particles in the rotating shaft downward. A small part of the working liquid and catalyst particles are discharged from the discharge port, and the remaining working liquid returns to the reaction vessel through the liquid passage. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a reaction vessel for preparing an aqueous solution of methylhydrazine according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the internal structure of a reaction vessel for preparing an aqueous solution of methylhydrazine according to an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the rotating shaft and end cap according to an embodiment of the present invention.

[0031] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0032] Figure 5 yes Figure 3 A sectional view.

[0033] Figure 6 This is a schematic diagram of the stirring rack structure according to an embodiment of the present invention.

[0034] Figure 7This is a schematic diagram of the mounting plate and communication port structure according to an embodiment of the present invention.

[0035] Figure 8 yes Figure 2 Enlarged view of point A in the middle.

[0036] Figure 9 This is a schematic diagram of the scraper structure according to an embodiment of the present invention.

[0037] Figure 10 This is a cross-sectional view of the internal structure of a reaction vessel for preparing an aqueous solution of methylhydrazine according to an embodiment of the present invention.

[0038] Figure label:

[0039] 1. Reactor; 2. Rotating shaft; 21. Discharge chute; 22. Screwdriver blade; 23. Liquid passage hole; 24. First gear; 3. End cap; 31. Air inlet; 4. Stirring frame; 41. Upper crossbeam; 411. First opening; 42. Lower crossbeam; 421. Flange; 4211. Second air outlet; 422. Second opening; 43. Connecting rod; 431. First air outlet; 5. Conveyor belt; 6. Mounting plate; 61. Connecting port; 71. Drive shaft; 72. Driven shaft; 73. Drive gear; 81. Drive seat; 811. Second gear; 82. Drive ring; 83. Hinge rod; 84. Drive component; 85. Elastic component; 9. Scraper; 91. Baffle; 10. Connecting pipe; 11. Lifting plate; 12. Lifting mechanism; 13. First valve; 14. Second valve; 15. Drive motor; 16. Air inlet chamber. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] like Figures 1 to 10 As shown, a reaction vessel for preparing an aqueous solution of methylhydrazine according to the present invention includes: reaction vessel 1.

[0042] Specifically, such as Figures 1 to 5As shown, the reactor 1 has an end cap 3 on top, and an air inlet 31 on the end cap 3. A rotating shaft 2 is located inside the reactor 1, coaxially distributed with the reactor 1. A drive motor 15 is mounted on the end cap 3, and the output end of the drive motor 15 passes through the end cap 3 and is fixedly connected to the rotating shaft 2. The drive motor 15 drives the rotating shaft 2 to rotate. The bottom end of the rotating shaft 2 passes through the reactor 1 and extends downwards. A liquid passage hole 23 is also provided on the side wall of the rotating shaft 2 near the bottom of the reactor 1. The rotating shaft 2 is a hollow structure, and an auger blade 22 is fixedly connected inside it. A discharge port is located at the bottom of the reactor 1, communicating with the rotating shaft 2. A first valve 13 and a second valve 14 are also provided on the discharge port, spaced vertically. The discharge port forms a discharge chamber between the first valve 13 and the second valve 14. The reactor 1 is equipped with a lifting plate 11 and a lifting mechanism 12 at the bottom of the reactor 1. The lifting mechanism 12 is a hydraulic cylinder, and its output end passes through the reactor 1 and is fixedly connected to the lifting plate 11. The lifting mechanism 12 can drive the lifting plate 11 to move up and down.

[0043] like Figures 2 to 8 As shown, a stirring frame 4 is provided on the side wall of the rotating shaft 2. The stirring frame 4 includes an upper crossbeam 41, a lower crossbeam 42 and a connecting rod 43. The upper crossbeam 41 and the lower crossbeam 42 are distributed in parallel and spaced apart. The inner ends of the upper crossbeam 41 and the lower crossbeam 42 are fixedly connected to the rotating shaft 2. The two ends of the connecting rod 43 are fixedly connected to the outer ends of the upper crossbeam 41 and the lower crossbeam 42 respectively. The upper crossbeam 41, the lower crossbeam 42 and the connecting rod 43 form a frame structure. Both the upper crossbeam 41 and the lower crossbeam 42 are provided with grooves, and each groove is provided with a mounting plate 6. The stirring rack 4 is provided with a conveyor belt 5 and a first drive mechanism. The first drive mechanism includes a drive shaft 71, a driven shaft 72 and a drive gear 73. The drive shaft 71 and the driven shaft 72 are parallel and spaced apart. The drive shaft 71 and the driven shaft 72 are rotatably fitted at both ends of the mounting plate 6. The two ends of the conveyor belt 5 are respectively sleeved on the drive shaft 71 and the driven shaft 72. The conveyor belt 5 is in frictional contact with the drive shaft 71 and the driven shaft 72. The drive gear 73 is fixedly connected to the drive shaft 71. A first gear 24 is fixedly connected to the rotating shaft 2. The drive gear 73 can mesh with the first gear 24.

[0044] The drive base 81 is also provided with a second drive mechanism, which includes a drive base 81, a drive ring 82, a hinge rod 83, and a drive component 84. The drive base 81 is slidably fitted on the rotating shaft 2, and the drive ring 82 is slidably fitted on the drive base 81. One end of the hinge rod 83 is hinged to the mounting plate 6, and the other end is hinged to a connecting block. The drive ring 82 is provided with an annular groove, and the connecting block is slidably fitted in the annular groove. The drive component 84 is provided on the end cover 3. The drive component 84 is a motor, and its output end extends through the end cover 3 into the reactor 1 and is fixedly connected to the drive base 81. The side wall of the drive base 81 is provided with an outer edge, and an elastic element 85 is provided between the outer edge of the drive base 81 and the drive ring 82. The elastic element 85 is an elastic connecting rod. The drive base 81 is provided with a second gear 811, which is located above the first gear 24, and the diameter of the second gear 811 is larger than the diameter of the first gear 24. The drive gear 73 can mesh with the second gear 811. A discharge trough 21 is provided on the side wall of the rotating shaft 2, and the conveyor belt 5 can extend into the discharge trough 21. The output end of the drive member 84 extends out and pushes the drive seat 81 to move downward. The drive seat 81 pushes the drive ring 82 to move downward synchronously with it through the elastic member 85. The downward movement of the drive ring 82 will push the hinge rod 83 to rotate, thereby pushing the mounting plate 6 to move outward along the radial direction of the reactor 1, so that the conveyor belt 5 moves outward. When the conveyor belt 5 moves to the outermost end, the drive seat 81 continues to move downward, causing the elastic member 85 to contract. When the elastic member 85 contracts to its limit, the second gear 811 meshes with the drive gear 73. When the drive seat 81 moves to the uppermost end, the end of the conveyor belt 5 can extend into the discharge trough 21. At this time, the drive gear 73 meshes with the first gear 24.

[0045] like Figure 2 , Figure 9 and Figure 10 As shown, the outer end of the stirring rack 4 is also provided with a scraper 9. The scraper 9 is rotatably engaged with the upper crossbeam 41 and the lower crossbeam 42 through a torsion spring. The scraper 9 is provided with a baffle 91, which can stop against the connecting rod 43.

[0046] like Figures 4 to 7 , Figure 10As shown, the rotating shaft 2 has an air inlet chamber 16, which is connected to the air inlet 31. The upper crossbeam 41 and the connecting rod 43 have a first air inlet channel, which is connected to the air inlet chamber 16. The connecting rod 43 has multiple first air outlets 431, which are distributed vertically at intervals on the side wall of the connecting rod 43. The lower crossbeam 42 has flanges 421 on both sides, and both flanges 421 are inclined downward to form an inverted V-shaped structure. The lower crossbeam 42 and the flanges 421 have a second air inlet channel. The side wall of the flanges 421 has multiple second air outlets 4211, which are distributed radially at intervals on the flanges 421 along the reactor 1. Both mounting plates 6 are hollow structures, and a connecting pipe 10 is provided between the two mounting plates 6. The two ends of the connecting pipe 10 are respectively connected to the two mounting plates 6. The side wall of the upper crossbeam 41 is provided with a first opening 411, and the side wall of the lower crossbeam 42 is provided with a second opening 422. Both mounting plates 6 are provided with connecting ports 61, and the two connecting ports 61 can be connected to the first opening 411 and the second opening 422 respectively.

[0047] According to an embodiment of the present invention, a reaction vessel for preparing an aqueous solution of methylhydrazine is provided. The working solution and catalyst particles are poured into the reaction vessel 1. A driving component 84 drives a driving seat 81 downwards, which in turn drives a mounting plate 6 to move radially outwards along the reaction vessel 1. The mounting plate 6 gradually approaches and abuts against the scraper 9. The outward movement of the mounting plate 6 pushes the scraper 9 to rotate, causing the scraper 9 to disengage from the side wall of the reaction vessel 1. Simultaneously, the baffle 91 disengages from the connecting rod 43, exposing the first vent 431. At this time, the first opening 411, the second opening 422, and the corresponding connecting port 61 are misaligned, thereby closing the first opening 411 and the second opening 422. When the mounting plate 6 moves outwards to its limit, a gap is formed between the conveyor belt 5 and the rotating shaft 2. The lifting mechanism 12 drives the lifting plate 11 downwards, creating a gap between the lifting plate 11 and the bottom surface of the flange 421, preventing the flange 421 from squeezing the catalyst particles and damaging them when the rotating shaft 2 rotates. At this time, the driving gear 73 meshes with the second gear 811.

[0048] The inlet 31 is connected to an external inlet pipe, through which hydrogen gas is introduced into the reactor 1. The hydrogen gas passes through the inlet chamber 16 and enters the first inlet channel, finally exiting from the first outlet 431. The hydrogen gas is directly introduced into the working fluid, facilitating the reaction between hydrogen and the working fluid. The drive motor 15 drives the rotating shaft 2 to rotate counterclockwise. The stirring frame 4 rotates synchronously with the rotating shaft 2, causing the drive gear 73 to rotate counterclockwise around the first gear 24, which in turn causes the conveyor belt 5 to rotate counterclockwise. The stirring frame 4 and the conveyor belt 5 rotate within the reactor 1, thereby agitating the working fluid and increasing the reaction rate between the working fluid and hydrogen. When the rotating shaft 2 rotates counterclockwise, the auger blades 22 rotate synchronously with the rotating shaft 2. The working fluid enters the rotating shaft 2 through the liquid inlet 23. The auger blades 22 push the working fluid at the bottom of the rotating shaft 2 upwards and discharge it from the discharge trough 21. This process allows the working fluid to circulate, improving the reaction efficiency between the working fluid and hydrogen.

[0049] After the reaction is complete, the drive unit 84 drives the drive seat 81 to move upward, causing the mounting plate 6 to move radially inward along the reactor 1 until the inner side of the conveyor belt 5 extends into the discharge trough 21. During this process, the mounting plate 6 disengages from the scraper 9, and the scraper 9 returns to its original position under the action of the torsion spring. The scraper 9 abuts against the side wall of the reactor 1, and the baffle 91 abuts against the connecting rod 43, thereby sealing the first gas outlet 431. When the conveyor belt 5 moves inward to its limit, the drive gear 73 meshes with the first gear 24. At this time, the two connecting ports 61 are connected to the first opening 411 and the second opening 422, respectively. Hydrogen gas enters the second gas inlet channel from the first gas inlet channel through the mounting plate 6 and the connecting port 61, and is discharged from the second gas outlet 4211. The second drive motor 15 drives the rotating shaft 2 to rotate clockwise, so that the drive gear 73 can rotate clockwise along the second gear 811, thereby driving the conveyor belt 5 to rotate clockwise. At the same time, the lifting mechanism 12 drives the lifting plate 11 to move upward until the lifting plate 11 stops against the bottom end of the flange 421. As the conveyor belt 5 rotates around the rotating shaft 2, the flange 421 can scoop the catalyst particles on the lifting plate 11 to the second gas outlet 4211. The hydrogen gas discharged from the second gas outlet 4211 can blow the catalyst particles at the bottom of the reactor 1 upward, thus dispersing them inside the reactor 1. When the conveyor belt 5 rotates, the catalyst particles will stick to the conveyor belt 5 under pressure. At the same time, the scraper 9 will scrape off the catalyst particles attached to the side wall of the reactor 1. The scraped catalyst particles can move along the scraper 9 to the conveyor belt 5. The conveyor belt 5 transports the catalyst particles to the discharge trough 21. The auger blades 22 rotate synchronously with the rotating shaft 2, pushing the catalyst particles and working fluid in the rotating shaft 2 downward together. The first valve 13 opens, and the catalyst particles and a small amount of working fluid enter the discharge chamber. When all the catalyst particles in the reactor 1 have entered the discharge chamber, the first valve 13 is closed and the second valve 14 is opened to discharge the catalyst.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A reaction vessel for preparing an aqueous solution of methylhydrazine, comprising: A reaction vessel (1) is provided with a rotating shaft (2) inside the reaction vessel (1) and an end cap (3) at the top of the reaction vessel (1). A stirring rack (4) is provided on the rotating shaft (2). The stirring rack (4) includes an upper crossbeam (41), a lower crossbeam (42) and a connecting rod (43). The upper crossbeam (41) and the lower crossbeam (42) are distributed parallel to each other at intervals. The two ends of the connecting rod (43) are connected to the upper crossbeam (41) and the lower crossbeam (42) respectively. The feature is that the stirring rack (4) is provided with a conveyor belt (5), the conveyor belt (5) is rotatably coupled to the stirring rack (4), the stirring rack (4) is provided with a first driving mechanism, the first driving mechanism is used to drive the conveyor belt (5) to rotate, the side wall of the rotating shaft (2) is provided with a discharge trough (21), one side of the conveyor belt (5) abuts against the side wall of the discharge trough (21), and the other side has a gap with the side wall of the discharge trough (21). The rotating shaft (2) is a hollow shaft, and a screw conveyor blade (22) is provided inside it. The side wall of the rotating shaft (2) near the bottom of the reactor (1) is provided with a liquid passage hole (23). The bottom end of the reactor (1) is provided with a discharge port, and the rotating shaft (2) is connected to the discharge port.

2. The reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 1, characterized in that, The first drive mechanism includes a drive shaft (71), a driven shaft (72), and a drive gear (73). Mounting plates (6) are provided on both the upper crossbeam (41) and the lower crossbeam (42). The drive shaft (71) and the driven shaft (72) are spaced apart. The drive shaft (71) and the driven shaft (72) are rotatably engaged with the mounting plates (6). The two ends of the conveyor belt (5) are respectively sleeved on the drive shaft (71) and the driven shaft (72) and are in frictional engagement with the drive shaft (71) and the driven shaft (72). The conveyor belt (5) is located between the two mounting plates (6). The drive gear (73) is fixedly connected to the drive shaft (71). A first gear (24) is provided on the rotating shaft (2). The drive gear (73) can mesh with the first gear (24).

3. The reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 2, characterized in that, The rotating shaft (2) is also provided with a second driving mechanism, which includes a driving seat (81), a driving ring (82), a hinge rod (83), and a driving component (84). The driving seat (81) is slidably fitted on the rotating shaft (2), and the driving ring (82) is slidably fitted on the driving seat (81). One end of the hinge rod (83) is hinged to the mounting plate (6), and the other end is hinged to a connecting block. The connecting block is slidably fitted with the driving ring (82), and the connecting block can move circumferentially along the driving ring (82). The driving component (84) is provided on the end cover (3), and the output end of the driving component (84) is connected to the driving seat (81). An elastic element (85) is provided between the driving seat (81) and the driving ring (82). The mounting plate (6) is slidably fitted with the corresponding upper crossbeam (41) or lower crossbeam (42). The second driving mechanism is used to drive the mounting plate (6) to move radially along the reactor (1).

4. The reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 3, characterized in that, The stirring rack (4) is equipped with a scraper (9), which can abut against the inner wall of the reactor (1).

5. A reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 4, characterized in that, The end cap (3) is provided with an air inlet (31), the rotating shaft (2) is provided with an air inlet chamber (16), the air inlet (31) is connected to the air inlet chamber (16), the upper crossbeam (41) and the connecting rod (43) are provided with a first air inlet channel, the air inlet chamber (16) is connected to the first air inlet channel, the side wall of the connecting rod (43) is provided with a plurality of first air outlets (431), the first air outlets (431) are connected to the first air inlet channel, and the plurality of first air outlets (431) are distributed vertically and horizontally on the side wall of the stirring rack (4).

6. A reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 5, characterized in that, The scraper (9) is provided with a baffle (91). The scraper (9) is rotatably engaged with the stirring frame (4) by a torsion spring. The mounting plate (6) can push the scraper (9) to rotate. The baffle (91) can close the first air outlet (431).

7. A reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 6, characterized in that, Both sides of the lower crossbeam (42) are provided with flanges (421), both flanges (421) are inclined downwards, the lower crossbeam (42) and the flanges (421) are provided with a second air intake channel, the side wall of the flanges (421) is provided with a second air outlet (4211), both mounting plates (6) are hollow structures, a connecting pipe (10) is provided between the two mounting plates (6), the side wall of the upper crossbeam (41) is provided with a first opening (411), the side wall of the lower crossbeam (42) is provided with a second opening (422), the side wall of each mounting plate (6) is provided with a connecting port (61), and the two connecting ports (61) can be connected to the first opening (411) and the second opening (422) respectively.

8. A reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 7, characterized in that, The reactor (1) is provided with a lifting plate (11), which slides with the side wall of the reactor (1). The bottom of the reactor (1) is provided with a lifting mechanism (12), which is used to drive the lifting plate (11) to move up and down.

9. A reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 1, characterized in that, The discharge port is provided with a first valve (13) and a second valve (14), which are distributed at intervals. The discharge port forms a discharge cavity between the first valve (13) and the second valve (14).

10. A reaction vessel for preparing an aqueous solution of methylhydrazine according to claim 5, characterized in that, An air pump is connected to the air inlet (31).

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