A cyanate ester synthesis catalytic reaction device and method

Abstract

The invention discloses a cyanate synthesis catalytic reaction device and method, belonging to the field of catalytic devices; the device comprises a reactor and a weighing ring, a convex ring is arranged on the side wall of the reactor, and the weighing ring receives the convex ring; a bracket is placed on the side of the reactor, a metering cylinder and a first motor are connected to the bracket, an extraction pipe and a discharge pipe are connected to the metering cylinder, the discharge pipe is connected to the reactor, and the extraction pipe is connected to a catalyst supply place; a first sliding contact is arranged on the first sliding switch, a limiting pressure rod is connected to the lower surface of a piston plate, a hole matched with the limiting pressure rod is opened on the bracket, when the piston plate moves downward, the limiting pressure rod moves downward and pushes the first sliding contact to slide under the first sliding switch, so that the rotation speed of the first motor is reduced; when the weight of the reactant is high, the rotation speed of the first motor is slowed down, so that the speed of adding the catalyst is reduced, thereby avoiding the occurrence of excessively violent reactions.

Description

Technical Field

[0001] The invention relates to the technical field of catalytic devices, and in particular to a cyanate ester synthesis catalytic reaction device and method. Background Art

[0002] In the field of chemical synthesis, especially in the synthesis of cyanate esters, the precise addition of catalysts is crucial to controlling the reaction rate, improving product purity and reducing the formation of by-products. Traditional methods of adding catalysts often rely on manual operation or simple mechanical devices, which makes it difficult to accurately control the amount of catalyst added, especially when the amount of reactants varies greatly, the catalyst addition rate is often difficult to match the reaction requirements.

[0003] In the existing technology, although there are some automated catalyst addition devices, these devices often lack flexible adjustment mechanisms when dealing with reactants of different weights. When the solvent in the reactor is fixed and the amount of reactants increases, if the catalyst addition rate remains unchanged, the reaction may be too intense, generating a lot of heat and side reactions, which will not only reduce the quality and purity of the product, but also may damage the reaction equipment. Summary of the invention

[0004] The object of the present invention is to provide a cyanate ester synthesis catalytic reaction device and method, which solves the problem that the catalyst dropping speed is not easy to control according to the total amount of reactants during cyanate ester synthesis.

[0005] To achieve the above object, the present invention provides the following technical solution: a cyanate ester synthesis catalytic reaction device, comprising a reactor and a weighing ring, wherein a convex ring is arranged on the side wall of the reactor, and the weighing ring receives the convex ring;

[0006] A bracket is placed on the side of the reactor, a metering cylinder and a first motor are connected to the bracket, an extraction pipe and a discharge pipe are connected to the metering cylinder, both the extraction pipe and the discharge pipe are provided with a one-way valve, the discharge pipe is connected to the reactor, the extraction pipe is connected to the catalyst supply, a piston plate is slidably connected in the metering cylinder, a threaded rod is connected to the lower surface of the piston plate, a threaded cylinder is connected to the output end of the first motor, and the threaded rod is threadedly connected to the threaded cylinder;

[0007] A gravity sensor is provided on the weighing ring. When the first motor is started, it drives the threaded barrel to rotate so that the piston plate can be lifted and lowered. Moreover, when the value detected by the gravity sensor increases, the rotation angle of the threaded barrel increases so that the lifting stroke of the piston plate increases.

[0008] Preferably, a first sliding switch for controlling the speed of the first motor is provided on the bracket, a first sliding contact is provided on the first sliding switch, a limiting pressure rod is connected to the lower surface of the piston plate, and a hole cooperating with the limiting pressure rod is provided on the bracket. When the piston plate moves downward, the limiting pressure rod moves downward and pushes the first sliding contact to slide down under the first sliding switch, thereby reducing the speed of the first motor.

[0009] Preferably, the bracket is connected to a cylinder, the output end of the cylinder is connected to a limit frame, and the limit frame is sleeved on the first sliding contact;

[0010] A temperature sensor and a pressure sensor are provided in the reactor. When the value detected by the temperature sensor and / or the pressure sensor increases, the cylinder is shortened so that the first sliding contact slides down under the first sliding switch. When the value detected by the temperature sensor and / or the pressure sensor is restored, the cylinder is extended so that the first sliding contact slides up under the first sliding switch.

[0011] Preferably, a control pipe and an exhaust pipe are connected to the cylinder body of the cylinder, the control pipe is connected to the control element of the pneumatic transmission system, the exhaust pipe is connected to the control pipe, and a solenoid valve is arranged on the exhaust pipe. When the first motor is started to move the piston plate downward, the solenoid valve opens.

[0012] Preferably, the lower part of the weighing ring is connected to a support foot, the support foot is connected to a hydraulic rod, the output rod end of the hydraulic rod is connected to a hinge ball, and a hinge groove cooperating with the hinge ball is opened in the middle of the bottom of the reactor, and when the output rod is shortened, the angle between the axis of the reactor and the output rod approaches one hundred and eighty degrees.

[0013] Preferably, a nut is threadedly connected to the side wall of the weighing ring, and the nut abuts against the convex ring.

[0014] Preferably, a kettle cover is provided on the upper part of the reactor, a second motor is connected to the kettle cover, a stirring rod is connected to the output end of the second motor, and the stirring rod rotates in the reactor.

[0015] Preferably, a second sliding switch for controlling the rotation speed of the second motor is connected to the bracket, and after the limit frame moves downward, the second sliding contact of the second sliding switch is pressed downward, thereby increasing the rotation speed of the second motor;

[0016] A convex block is arranged at the lower part of the second sliding switch, a guide rod is connected to the second sliding contact, the guide rod is plugged into the convex block, and a first spring is arranged between the second sliding contact and the convex block.

[0017] Preferably, the kettle cover is connected with a pressure relief pipe, a blocking plate is slidably connected in the pressure relief pipe, an end of the blocking plate passes through the side wall of the pressure relief pipe and is hinged with a swing rod, the top of the reactor is connected with a base, the second motor is connected to the base, an electric telescopic rod is connected to the base, an output end of the electric telescopic rod is connected with a ball, and when the speed of the second motor increases, the electric telescopic rod is extended to push the swing rod to abut against the stirring rod;

[0018] A vertical plate is fixedly connected to the top of the reactor, a side wall of the vertical plate is connected to a limit plate via a second spring, and an end of the swing rod abuts against the limit plate.

[0019] A catalytic reaction method based on a cyanate ester synthesis catalytic reaction device comprises the following steps:

[0020] S1. Open the kettle cover and add the reactants into the reactor. After the reactants are added, control the extension and retraction of the hydraulic rod to correct the position of the reactor.

[0021] S2, the weighing ring weighs the total weight of the reactor after calibration, and controls the number of revolutions of the first motor according to the weighed weight, so that the piston plate slides down a corresponding distance relative to the metering cylinder, so that the metering cylinder extracts a catalyst that matches the weight of the reactants in the reactor;

[0022] S3, when the piston plate slides down, the first motor and the second motor are controlled by the limit pressure rod to adjust to the appropriate speed;

[0023] S4, after the reactants in the reactor are stirred evenly, the first motor is controlled to start and drive the piston plate to move upward, so that the catalyst is gradually added into the reactor;

[0024] S5. When the temperature or pressure in the reactor increases, the cylinder is extended to reduce the catalyst addition rate and increase the stirring speed of the stirring rod, so that the reaction proceeds as quickly as possible. When the temperature or pressure is restored, the catalyst addition rate is restored and the stirring rod speed is restored;

[0025] S6. When the rotation speed of the stirring rod increases, the electric telescopic rod extends, so that the swing rod is close to the stirring rod, so that when the stirring rod rotates, the blocking plate is driven to slide through friction, so that the pressure of the reactor is released.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The solvent of the reactor of the present invention is fixed. When the amount of reactants is large, the catalyst will be added quickly, causing the reaction to be too violent and possibly producing by-products. Therefore, when the weight of the reactants is high, the downward movement distance of the piston plate increases. At this time, the greater the sliding distance of the first sliding contact pressed by the limit pressure rod, and when the sliding distance of the first sliding contact increases, the opening of the first sliding switch decreases, so that the rotation speed of the first motor slows down, thereby ensuring that the speed of the first motor driving the piston plate to move upward is reduced, which also reduces the catalyst addition speed, thereby avoiding the occurrence of an overly violent reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 is a cross-sectional view of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the convex ring of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the piston plate of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the sliding switch of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the second motor of the present invention.

[0034] In the figure: 1, reactor; 11, convex ring; 12, weighing ring; 13, support foot; 14, nut; 15, hydraulic rod; 16, output rod; 17, hinge ball; 2, bracket; 21, metering cylinder; 211, discharge pipe; 212, extraction pipe; 22, piston plate; 23, threaded rod; 24, threaded cylinder; 25, first motor; 26, limit pressure rod; 27, first sliding switch; 271, first sliding contact; 28, second sliding switch 281, second sliding contact; 282, guide rod; 283, first spring; 284, bump; 29, cylinder; 291, control tube; 292, exhaust pipe; 293, limit frame; 3, second motor; 31, stirring rod; 32, kettle cover; 33, pressure relief pipe; 34, blocking plate; 35, rocker arm; 36, base; 37, electric telescopic rod; 371, ball bearing; 38, vertical plate; 39, limit plate; 391, second spring. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Reference Figure 1-Figure 6 The present embodiment provides a technical solution: a cyanate ester synthesis catalytic reaction device, comprising a reactor 1, and also comprising a weighing ring 12, a convex ring 11 is arranged on the side wall of the reactor 1, and the weighing ring 12 receives the convex ring 11; a bracket 2 is placed on the side of the reactor 1, a metering cylinder 21 and a first motor 25 are connected to the bracket 2, an extraction pipe 212 and a discharge pipe 211 are connected to the metering cylinder 21, and both the extraction pipe 212 and the discharge pipe 211 are provided with a one-way valve, and the discharge pipe 211 is connected to the reactor 1, and the extraction pipe 212 and the discharge pipe 211 are connected to the reactor 1, and the extraction pipe 212 and the discharge pipe 211 are connected to the reactor 1, and the discharge pipe 211 is ... discharge pipe 211 is connected to the reactor 1, and the discharge pipe 211 is connected to the reactor 1, and the discharge pipe 211 is connected to the reactor 1, and the discharge pipe 211 is connected to the reactor 1, and the discharge pipe 211 is connected to the reactor 1, and the discharge pipe 211 is connected to the reactor 1, and the discharge pipe 211 is connected 212 is connected to the catalyst supply point, a piston plate 22 is slidably connected in the metering cylinder 21, a threaded rod 23 is connected to the lower surface of the piston plate 22, a threaded barrel 24 is connected to the output end of the first motor 25, and the threaded rod 23 is threadedly connected to the threaded barrel 24; a gravity sensor is provided on the weighing ring 12, and when the first motor 25 is started, the threaded barrel 24 is driven to rotate so that the piston plate 22 is lifted and lowered, and when the value detected by the gravity sensor increases, the rotation angle of the threaded barrel 24 increases, so that the lifting stroke of the piston plate 22 increases.

[0037] After adding reactants into the reactor 1, the gravity sensor on the weighing ring 12 is started, so that the gravity sensor weighs the weight of the reactor 1. The weight of the reactants is obtained by subtracting the weight of the reactor 1 from the weighing result. The control system calculates the required amount of catalyst according to the weight of the reactants, and outputs the amount of catalyst as the rotation angle of the first motor 25. When the first motor 25 rotates, it drives the threaded barrel 24 to rotate. Under the limiting action of the limiting pressure rod 26, the threaded rod 23 rotates relative to the threaded barrel 24 and moves axially. At this time, the piston plate 22 can move downward in the metering barrel 21, so that the metering barrel 21 extracts the catalyst through the extraction tube 212. After the first motor 25 rotates to the specified angle, the piston plate 22 also slides down a fixed distance, so that the metering barrel 21 extracts the amount of catalyst matching the weight of the reactants, ensuring that sufficient catalyst is provided for the synthesis of cyanate ester.

[0038] The catalyst addition rate control principle is as follows:

[0039] A first sliding switch 27 for controlling the rotational speed of the first motor 25 is provided on the bracket 2, and a first sliding contact 271 is provided on the first sliding switch 27. The lower surface of the piston plate 22 is connected to a limiting pressure rod 26, and a hole cooperating with the limiting pressure rod 26 is opened on the bracket 2. When the piston plate 22 moves downward, the limiting pressure rod 26 moves downward and pushes the first sliding contact 271 to slide down under the first sliding switch 27, thereby reducing the rotational speed of the first motor 25.

[0040] In this embodiment, the solvent of the reactor 1 is fixed. When the amount of reactants is large, the catalyst will be added quickly, causing the reaction to be too violent and possibly producing by-products. Therefore, when the weight of the reactants is high, the downward movement distance of the piston plate 22 increases. At this time, the greater the sliding distance of the limiting pressure rod 26 pressing the first sliding contact 271, and when the sliding distance of the first sliding contact 271 increases, the opening of the first sliding switch 27 decreases, so that the rotation speed of the first motor 25 slows down, thereby ensuring that the speed of the first motor 25 driving the piston plate 22 to move upward is reduced, which also reduces the speed of adding the catalyst, thereby avoiding the occurrence of an overly violent reaction.

[0041] A cylinder 29 is connected to the bracket 2, and the output end of the cylinder 29 is connected to a limit frame 293, and the limit frame 293 is sleeved on the first sliding contact 271; a temperature sensor and a pressure sensor are arranged in the reactor 1, and when the value detected by the temperature sensor and / or the pressure sensor increases, the cylinder 29 shortens so that the first sliding contact 271 slides down under the first sliding switch 27, and, when the value detected by the temperature sensor and / or the pressure sensor recovers, the cylinder 29 lengthens so that the first sliding contact 271 slides up under the first sliding switch 27.

[0042] The setting of the cylinder 29 enables the amount of catalyst added during the reaction process to adapt to the internal conditions of the reactor 1. Specifically, when the reaction is too intense, the temperature and pressure in the reactor 1 will rise or rise separately. At this time, the values ​​detected by the temperature sensor and the pressure sensor increase and the cylinder 29 is controlled to shorten, so that the cylinder 29 drives the first sliding contact 271 to move down to the lowest point or close to the lowest point, so that the speed of the first motor 25 is reduced or stopped, thereby suspending the addition of the catalyst and avoiding further excessive aggravation of the reaction. After the temperature or pressure is restored, the cylinder 29 extends and drives the first sliding contact 271 to reset, so that the speed of adding the catalyst is restored;

[0043] It should also be noted that any change in temperature or pressure will cause the cylinder 29 to perform corresponding expansion and contraction movements.

[0044] A control pipe 291 and an exhaust pipe 292 are connected to the cylinder body of the cylinder 29. The control pipe 291 is connected to the control element of the pneumatic transmission system. The exhaust pipe 292 is connected to the control pipe 291. An electromagnetic valve is arranged on the exhaust pipe 292. When the first motor 25 is started to move the piston plate 22 downward, the electromagnetic valve opens.

[0045] During the process of the metering cylinder 21 extracting the catalyst, the piston plate 22 is in a downward state. At this time, the first sliding contact 271 is driven to move downward. During this process, the solenoid valve on the exhaust pipe 292 is opened, thereby ensuring that the residual air in the cylinder 29 can be discharged, so that the downward movement of the first sliding contact 271 will not be blocked. When the piston plate 22 is to move upward, the solenoid valve of the exhaust pipe 292 is closed, so that the control element of the pneumatic transmission system can control the cylinder 29 to extend and retract according to the control system command.

[0046] How to ensure accurate weighing of reactants:

[0047] The lower part of the weighing ring 12 is connected to a support foot 13, and the support foot 13 is connected to a hydraulic rod 15. The end of the output rod 16 at the output end of the hydraulic rod 15 is connected to a hinge ball 17. A hinge groove that cooperates with the hinge ball 17 is opened in the middle of the bottom of the reactor 1. When the output rod 16 is shortened, the angle between the axis of the reactor 1 and the output rod 16 approaches 180 degrees.

[0048] Since the weighing ring 12 weighs the reactor 1 by means of the receiving convex ring 11, it is necessary to ensure the coaxiality of the reactor 1 and the weighing ring 12. In the initial stage of weighing, the output rod 16 is shortened to pull the reactor 1, so that the axis of the reactor 1 and the axis of the weighing ring 12 approach one hundred and eighty degrees. Then the output rod 16 is extended to release the pulling force on the reactor 1. Since there is a clearance fit between the articulated ball 17 and the articulated groove at the bottom of the reactor 1, an annular space is ensured between the articulated ball 17 and the reactor 1 after the output rod 16 is extended, thereby ensuring that the weighing of the reactants is not interfered with.

[0049] A nut 14 is threadedly connected to the side wall of the weighing ring 12 , and the nut 14 abuts against the convex ring 11 .

[0050] When the nut 14 is screwed onto the weighing ring 12 , it can cooperate with the weighing ring 12 so that the protruding ring 11 will not separate from the weighing ring 12 .

[0051] The relationship between the amount of catalyst added, reaction rate and stirring speed is as follows:

[0052] A kettle cover 32 is arranged on the upper part of the reaction kettle 1 , and a second motor 3 is connected to the kettle cover 32 . A stirring rod 31 is connected to the output end of the second motor 3 , and the stirring rod 31 rotates on the reaction kettle 1 .

[0053] When the second motor 3 is started, it drives the stirring rod 31 to rotate, so that the reactants are stirred.

[0054] A second sliding switch 28 for controlling the rotational speed of the second motor 3 is connected to the bracket 2. After the limit frame 293 moves downward, it squeezes the second sliding contact 281 of the second sliding switch 28 to slide down, thereby increasing the rotational speed of the second motor 3; a protrusion 284 is provided at the lower part of the second sliding switch 28, and a guide rod 282 is connected to the second sliding contact 281, and the guide rod 282 is inserted into the protrusion 284, and a first spring 283 is provided between the second sliding contact 281 and the protrusion 284.

[0055] The limit frame 293 at the output end of the cylinder 29 is initially pressed downward by the limit pressure rod 26 and moves downward, and then the limit frame 293 can press the second sliding contact 281, so that the second sliding contact 281 slides down relative to the second sliding switch 28, thereby increasing the speed of the second motor 3, so that the speed of the stirring rod 31 increases. In other words, if the weight of the reactant is large, the initial speed of the stirring rod 31 is fast, and the dripping speed of the catalyst is slow, so that the stirring speed of the reactant is increased when the catalyst is slowly added, ensuring that the reaction process is not too intense;

[0056] In addition, when the temperature or pressure in the reactor 1 increases, the cylinder 29 is further shortened, so that the catalyst dripping acceleration is further reduced. At this time, the rotation speed of the second motor 3 will increase, thereby accelerating the rotation speed of the stirring rod 31, so that the violent reaction state ends as soon as possible.

[0057] A pressure relief pipe 33 is connected to the kettle cover 32, and a blocking plate 34 is slidably connected inside the pressure relief pipe 33. The end of the blocking plate 34 passes through the side wall of the pressure relief pipe 33 and is hinged with a swing rod 35. A base 36 is connected to the top of the reactor 1, and the second motor 3 is connected to the base 36. An electric telescopic rod 37 is connected to the base 36, and a ball 371 is connected to the output end of the electric telescopic rod 37. When the speed of the second motor 3 increases, the electric telescopic rod 37 extends to push the swing rod 35 to abut against the stirring rod 31; a vertical plate 38 is fixedly connected to the top of the reactor 1, and the side wall of the vertical plate 38 is connected to the limiting plate 39 through a second spring 391, and the end of the swing rod 35 abuts against the limiting plate 39.

[0058] The electric telescopic rod 37 is started according to the feedback of the pressure sensor in the reactor 1, and can also be started according to the speed feedback of the second motor 3. When the pressure in the reactor 1 increases, the electric telescopic rod 37 is extended, so that the ball 371 at its output end abuts against the swing rod 35, so that the swing rod 35 is pushed and abuts against the stirring rod 31. At this time, when the stirring rod 31 rotates, the friction between the swing rod 35 and the blocking plate 34 can pull the sliding of the pressure relief pipe 33, so that the pressure in the reactor 1 can be released. The second spring 391, the limit plate 39 and the swing rod 35 exert a reverse force on the blocking plate 34, so that the blocking plate 34 can be reset after the electric telescopic rod 37 is shortened;

[0059] By providing the vertical plate 38, the limiting plate 39 and the second spring 391, the cooling system of the reactor 1 can be linked to the movement of the limiting plate 39 according to the properties of the reactants, so that the cooling system runs faster when the limiting plate 39 moves, ensuring that the reactor 1 is depressurized and the reactor 1 is quickly cooled down.

[0060] A catalytic reaction method based on a cyanate ester synthesis catalytic reaction device comprises the following steps:

[0061] S1, open the kettle cover 32, add the reactants into the reactor 1, and after the reactants are added, control the hydraulic rod 15 to extend and retract to correct the position of the reactor 1;

[0062] S2, the weighing ring 12 weighs the total weight of the reactor 1 after calibration, and controls the number of revolutions of the first motor 25 according to the weighed weight, so that the piston plate 22 slides down a corresponding distance relative to the metering cylinder 21, so that the metering cylinder 21 extracts the catalyst matching the weight of the reactants in the reactor 1;

[0063] S3, when the piston plate 22 slides down, the first motor 25 and the second motor 3 are controlled by the limit pressure rod 26 to adjust to a suitable speed;

[0064] S4, after the reactants in the reactor 1 are stirred evenly, the first motor 25 is controlled to start and drive the piston plate 22 to move upward, so that the catalyst is gradually added into the reactor 1;

[0065] S5. When the temperature or pressure in the reactor 1 increases, the cylinder 29 is extended to reduce the catalyst addition speed and increase the stirring speed of the stirring rod 31, so that the reaction proceeds as quickly as possible. When the temperature or pressure is restored, the catalyst addition speed is restored and the rotation speed of the stirring rod 31 is restored.

[0066] S6. When the rotation speed of the stirring rod 31 increases, the electric telescopic rod 37 extends, so that the swing rod 35 is close to the stirring rod 31, so that when the stirring rod 31 rotates, the blocking plate 34 is driven to slide by friction, so that the pressure of the reactor 1 is released.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cyanate ester synthesis catalytic reaction device, comprising a reaction kettle (1), characterized in that: It also comprises a weighing ring (12), a convex ring (11) is arranged on the side wall of the reaction kettle (1), and the weighing ring (12) receives the convex ring (11); A support (2) is placed on the side of the reaction kettle (1), a metering cylinder (21) and a first motor (25) are connected to the support (2), an extraction pipe (212) and a discharge pipe (211) are connected to the metering cylinder (21), both the extraction pipe (212) and the discharge pipe (211) are provided with a one-way valve, the discharge pipe (211) is connected to the reaction kettle (1), the extraction pipe (212) is connected to a catalyst supply point, a piston plate (22) is slidably connected inside the metering cylinder (21), a threaded rod (23) is connected to the lower surface of the piston plate (22), a threaded cylinder (24) is connected to the output end of the first motor (25), and the threaded rod (23) is threadedly connected to the threaded cylinder (24); The bracket (2) is provided with a first sliding switch (27) for controlling the rotation speed of the first motor (25); the first sliding switch (27) is provided with a first sliding contact (271); the lower surface of the piston plate (22) is connected to a limit pressure rod (26); the bracket (2) is provided with a hole that cooperates with the limit pressure rod (26); when the piston plate (22) moves downward, the limit pressure rod (26) moves downward and pushes the first sliding contact (271) to slide down under the first sliding switch (27), thereby reducing the rotation speed of the first motor (25); The weighing ring (12) is provided with a gravity sensor, and when the first motor (25) is started, it drives the threaded barrel (24) to rotate so that the piston plate (22) can be lifted or lowered. Moreover, when the value detected by the gravity sensor increases, the rotation angle of the threaded barrel (24) increases so that the lifting stroke of the piston plate (22) increases.

2. The cyanate synthesis catalytic reaction device according to claim 1, characterized in that: The support (2) is connected to a cylinder (29); the output end of the cylinder (29) is connected to a limit frame (293); and the limit frame (293) is sleeved on the first sliding contact (271); The reactor (1) is provided with a temperature sensor and a pressure sensor. When the value detected by the temperature sensor and / or the pressure sensor increases, the cylinder (29) shortens so that the first sliding contact (271) slides down under the first sliding switch (27); and when the value detected by the temperature sensor and / or the pressure sensor recovers, the cylinder (29) lengthens so that the first sliding contact (271) slides up under the first sliding switch (27).

3. The cyanate synthesis catalytic reaction device according to claim 2, characterized in that: A control pipe (291) and an exhaust pipe (292) are connected to the cylinder body of the air cylinder (29); the control pipe (291) is connected to a control element of a pneumatic transmission system; the exhaust pipe (292) is connected to the control pipe (291); an electromagnetic valve is provided on the exhaust pipe (292); when the first motor (25) is started to move the piston plate (22) downward, the electromagnetic valve opens.

4. The cyanate synthesis catalytic reaction device according to claim 3, characterized in that: The lower part of the weighing ring (12) is connected to a support foot (13), and the support foot (13) is connected to a hydraulic rod (15). The end of an output rod (16) at the output end of the hydraulic rod (15) is connected to a hinge ball (17). A hinge groove cooperating with the hinge ball (17) is provided in the middle of the bottom of the reactor (1). When the output rod (16) is shortened, the angle between the axis of the reactor (1) and the output rod (16) approaches 180 degrees.

5. The cyanate synthesis catalytic reaction device according to claim 4, characterized in that: A nut (14) is threadedly connected to the side wall of the weighing ring (12), and the nut (14) abuts against the convex ring (11).

6. The cyanate synthesis catalytic reaction device according to claim 5, characterized in that: A kettle cover (32) is arranged on the upper part of the reaction kettle (1), a second motor (3) is connected to the kettle cover (32), an output end of the second motor (3) is connected to a stirring rod (31), and the stirring rod (31) rotates on the reaction kettle (1).

7. The cyanate synthesis catalytic reaction device according to claim 6, characterized in that: The bracket (2) is connected to a second sliding switch (28) for controlling the rotation speed of the second motor (3); the limit frame (293) moves downward to press the second sliding contact (281) of the second sliding switch (28) downward, thereby increasing the rotation speed of the second motor (3); A protrusion (284) is provided at the lower part of the second sliding switch (28); a guide rod (282) is connected to the second sliding contact (281); the guide rod (282) is plugged into the protrusion (284); and a first spring (283) is provided between the second sliding contact (281) and the protrusion (284).

8. The cyanate synthesis catalytic reaction device according to claim 7, characterized in that: The kettle cover (32) is connected to a pressure relief pipe (33), a blocking plate (34) is slidably connected inside the pressure relief pipe (33), an end of the blocking plate (34) penetrates the side wall of the pressure relief pipe (33) and is hingedly connected to a swing rod (35), the top of the reaction kettle (1) is connected to a base (36), the second motor (3) is connected to the base (36), an electric telescopic rod (37) is connected to the base (36), an output end of the electric telescopic rod (37) is connected to a ball (371), and when the rotation speed of the second motor (3) increases, the electric telescopic rod (37) extends to push the swing rod (35) to abut against the stirring rod (31); A vertical plate (38) is fixedly connected to the top of the reactor (1); a side wall of the vertical plate (38) is connected to a limiting plate (39) via a second spring (391); and an end of the swing rod (35) abuts against the limiting plate (39).

9. A catalytic reaction method based on the cyanate synthesis catalytic reaction device according to claim 8, characterized in that: The following steps are involved: S1, opening the kettle cover (32), adding the reactants into the reactor (1), and after the reactants are added, controlling the hydraulic rod (15) to extend and retract to correct the position of the reactor (1); S2, the weighing ring (12) weighs the total weight of the calibrated reactor (1), and controls the number of rotations of the first motor (25) according to the weighed weight, so that the piston plate (22) slides down a corresponding distance relative to the metering cylinder (21), so that the metering cylinder (21) extracts a catalyst that matches the weight of the reactants in the reactor (1); S3, when the piston plate (22) slides down, the first motor (25) and the second motor (3) are controlled by the limit pressure rod (26) to adjust to a suitable rotation speed; S4, after the reactants in the reaction kettle (1) are stirred evenly, the first motor (25) is controlled to start and drive the piston plate (22) to move upward, so that the catalyst is gradually added into the reaction kettle (1); S5. When the temperature or pressure in the reactor (1) increases, the cylinder (29) extends to reduce the catalyst addition rate and increase the stirring rate of the stirring rod (31), so that the reaction proceeds as quickly as possible. When the temperature or pressure is restored, the catalyst addition rate is restored and the rotation speed of the stirring rod (31) is restored. S6. When the rotation speed of the stirring rod (31) increases, the electric telescopic rod (37) extends, so that the swing rod (35) is close to the stirring rod (31), so that when the stirring rod (31) rotates, the blocking plate (34) is driven to slide by friction, so that the pressure of the reactor (1) is released.

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