Nadic anhydride microchannel production equipment

Abstract

The invention discloses nadic anhydride micro-channel production equipment which comprises a micro-pipeline, a heat exchange jacket is arranged outside the micro-pipeline, a nitrogen channel is arranged in the micro-pipeline and distributed along the bottom of the inner wall of the micro-pipeline, a nitrogen conveying pipe is arranged at one end of the nitrogen channel, and a nitrogen outlet pipe is arranged at the other end of the nitrogen conveying pipe. The nitrogen channel is provided with a plurality of exhaust pipes, the exhaust pipes are arranged at intervals along the distribution path of the nitrogen channel, the micro-pipeline is provided with a plurality of floating ball type automatic exhaust valves, and the floating ball type automatic exhaust valves are arranged at intervals along the distribution path of the micro-pipeline. The method is suitable for producing nadic anhydride by a one-pot method, and compared with a sectional cooling production process, the energy is saved, the yield is improved, and the safety of equipment is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving production, and in particular to a microchannel production device for nadic anhydride. Background Art

[0002] Nadic anhydride is an important epoxy resin curing agent. Its production process is to depolymerize dicyclopentadiene into cyclopentadiene, and then react cyclopentadiene with maleic anhydride (dienophile) through the Diels-Alder cycloaddition reaction to produce nadic anhydride. In the reaction process, the depolymerization reaction is the most important step. Usually, a large amount of inert gas is introduced, which can not only avoid the repolymerization of cyclopentadiene at high temperature, inhibit the decomposition of nadic anhydride under oxygen conditions, improve the yield, but also reduce the oxygen concentration to enhance safety.

[0003] Patent 202010464224.3 discloses a cyclopentadiene microchannel cracking reactor and its method. By using a primary cooling microchannel and a secondary cooling microchannel, the generated cyclopentadiene is quickly cooled from 170 - 180 °C to 0 - 5 °C, improving the yield of cyclopentadiene. However, in the subsequent reaction process of cyclopentadiene and maleic anhydride, the reaction temperature is 80 - 120 °C, and cyclopentadiene needs to be heated again to promote the reaction. The practice of cooling to increase the yield is very energy-consuming for the process of producing nadic anhydride in segments. At the same time, nitrogen is mixed and introduced with the raw material liquid before the cracking microchannel reactor. During the high-temperature reaction process, a large amount of nitrogen will overflow from the inside of the reaction liquid and float on the surface of the reaction liquid, which not only seriously reduces the protective effect of nitrogen on the reaction process, but also the nitrogen in the upper layer will hinder the liquid flow and is not conducive to the normal progress of the reaction.

[0004] How to design the structure of the nadic anhydride reactor to improve the reaction yield, save a large amount of energy, and make the reaction proceed stably, normally and safely is the key point of enterprise research and development. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a microchannel production device for nadic anhydride, so as to solve the problem that the inert gas introduced into the existing microchannel reactor for producing nadic anhydride is separated from the reaction liquid at high temperature and loses its protective effect.

[0006] The object of the present invention is achieved by the following technical solutions: A nadic anhydride microchannel production device includes a microchannel. An outer jacket for heat exchange is provided outside the microchannel. A nitrogen channel is provided inside the microchannel, and the nitrogen channel is distributed along the bottom of the inner wall of the microchannel. One end of the nitrogen channel is provided with a nitrogen gas pipeline, and a plurality of exhaust pipes are provided on the nitrogen channel. The exhaust pipes are arranged at intervals along the distribution path of the nitrogen channel. A plurality of float type automatic exhaust valves are provided on the microchannel, and the float type automatic exhaust valves are arranged at intervals along the distribution path of the microchannel.

[0007] Preferably, an installation shell is provided at the bottom of the outer wall of the microchannel. The installation shell is of a cuboid structure. The upper part of the installation shell is fixedly connected to the microchannel. A plurality of first chambers are provided in the upper part of the installation shell, and the first chambers are arranged at intervals in a straight line. A second chamber is provided in the lower part of the installation shell, and the second chamber communicates with a plurality of the first chambers. A piston rod and a driving mechanism are provided in the first chamber. The piston rod passes through the microchannel and extends into the exhaust pipe. A sliding seal connection is provided between the microchannel and the piston rod. A piston plate matching the exhaust pipe is provided at the top end of the piston rod. The driving mechanism is used to push the piston rod to reciprocate up and down and make the piston plate open or close the exhaust pipe.

[0008] Preferably, the driving mechanism includes an upper top plate, a first spring, a lower baffle, a plurality of pushing blocks, a connecting rod, an inclined cross-section cylinder, a second spring, and a driving motor. The upper top plate, the first spring, and the lower baffle are located in the first chamber. The piston rod passes through the microchannel, the upper top plate, the first spring, and the lower baffle from top to bottom and extends into the second chamber. The upper top plate is fixedly connected to the microchannel, and a sliding seal connection is provided between the upper top plate and the piston rod. The first spring is sleeved on the piston rod. The lower baffle is fixedly connected to the piston rod. The pushing blocks, the connecting rod, the inclined cross-section cylinder, and the second spring are located in the second chamber. The pushing block is provided with a slot with a low middle and high ends. Different height positions of the bottom end of the piston rod pushing against the slot correspond to the piston plate opening or closing the exhaust pipe. The connecting rod fixedly connects and fixes a plurality of pushing blocks together. The second spring is located at one end of the connecting rod and pushes the connecting rod and the pushing block to slide towards the other end. An arc head is provided at the other end of the connecting rod, and the arc head pushes against the inclined surface of the inclined cross-section cylinder. The driving motor is used to drive the inclined cross-section cylinder to rotate and push the connecting rod and the pushing block to slide reciprocally.

[0009] Preferably, the driving motor is of a pneumatic motor structure. The exhaust port of the driving motor communicates with the nitrogen gas pipeline. The output end of the driving motor is fixedly connected to the axis of the inclined cross-section cylinder. The states of adjacent piston plates opening or closing the exhaust pipe are opposite.

[0010] Preferably, a roller is provided at the bottom end of the piston rod. The roller is pivotally connected to the piston rod, and the roller pushes against the slotted opening.

[0011] Preferably, a rotating shaft and an eccentric column are provided in the second chamber. The rotating shaft passes through the mounting shell and is rotatably connected thereto. The rotating shaft is fixedly connected to the center of the eccentric column. The eccentric column is slidably connected to the pushing block. One end of the connecting rod is provided with an outer cylinder and an inner cylinder. Both the outer cylinder and the inner cylinder are tubular structures with one end open. A part of the inner cylinder is sleeved inside the outer cylinder, and the outer cylinder is slidably connected to the inner cylinder. The second spring is located between the outer cylinder and the inner cylinder. The outer cylinder is fixedly connected to the connecting rod. The eccentric column rotates to push the outer cylinder, the inner cylinder, the connecting rod, and the pushing block to slide up and down in the second chamber. The eccentric column sequentially pushes the pushing block, the piston rod, and the piston plate upward to close all the exhaust pipes. An adjusting handwheel is provided on the outer part of the mounting shell where the rotating shaft is located.

[0012] Preferably, a sliding plate is provided in the second chamber, and the sliding plate is located between the eccentric column and the pushing block.

[0013] Preferably, a ratchet is provided on the rotating shaft, and a detent pawl cooperating with the ratchet is provided on the mounting shell.

[0014] The present invention has the following advantages:

[0015] 1. Provide a device for producing nadic anhydride by a one-pot method. The device can precisely control the temperature of the reaction through microchannels, and at the same time can continuously introduce nitrogen into the reaction solution, which not only improves the safety of the device, but also can avoid the generation of side reactions and the re-polymerization of cyclopentadiene, improve the yield of nadic anhydride, and further avoid the problem of the obstruction of the reaction solution by the accumulation of excess nitrogen above the pipeline;

[0016] 2. By setting a piston plate that reciprocates up and down to open or close the exhaust pipe, the effect of pulsed aeration is achieved. Compared with continuous introduction of nitrogen, the bubble dispersion effect is better and the protective effect on the reaction is stronger;

[0017] 3. The driving motor is of a pneumatic motor structure, which can effectively utilize the energy of the flowing nitrogen. Through the cooperation with the pushing block, the first spring, the second spring, and the inclined-section cylinder, the function of pulsed aeration can be automatically realized without an additional power source, which is energy-saving and efficient;

[0018] 4. Through the cooperation of the exhaust pipe and the eccentric column, the piston plate can completely enter the exhaust pipe to achieve a sealing effect, avoiding the problem of the reaction solution flowing back into the nitrogen channel after the gas is cut off, and improving the safety of the device. Brief Description of the Drawings

[0019] Figure 1 is a schematic view of the overall structure of an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a schematic view of the overall structure without the jacket;

[0021] Figure 3 is a schematic view of the overall structure of a group of microchannel reactors of the present invention;

[0022] Figure 4 is Figure 3 a schematic sectional view;

[0023] Figure 5 is Figure 4 a partially enlarged schematic view of part A in;

[0024] Figure 6 is Figure 4 a partially enlarged schematic view of part B in;

[0025] Figure 7 is Figure 4 a partially enlarged schematic view of part C in;

[0026] Figure 8 is Figure 3 a sectional view in another direction;

[0027] Figure 9 is Figure 3 a schematic view of the overall structure after removing the installation shell.

[0028] In the figure, 1, microchannel; 2, reaction liquid inlet; 3, reaction liquid outlet; 4, jacket; 5, nitrogen channel; 6, floating ball type automatic exhaust valve; 7, nitrogen gas pipeline; 8, installation shell; 9, exhaust pipe; 10, piston plate; 11, piston rod; 12, upper top plate; 13, first spring; 14, lower baffle; 15, roller; 16, pushing block; 17, connecting rod; 18, driving motor; 19, inclined section cylinder; 20, arc head; 21, outer cylinder; 22, inner cylinder; 23, second spring; 24, fixed column; 25, first chamber; 26, second chamber; 27, sliding plate; 28, rotating shaft; 29, eccentric column; 30, adjusting handwheel; 31, ratchet; 32, stop pawl; 33, slot. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] As Figure 1 shown, a nadic anhydride microchannel production device includes three groups of serially connected micro-pipes 1. A heat exchange jacket 4 is installed outside the three groups of micro-pipes 1. The jacket 4 is provided with inlets and outlets for cold and hot fluids. One end of the three groups of serially connected micro-pipes 1 is a reaction liquid inlet 2, and the other end of the three groups of serially connected micro-pipes 1 is a reaction liquid outlet 3. A nitrogen channel 5 is installed inside the micro-pipe 1. The nitrogen channel 5 is in the structure of an arc plate, and it forms a cavity channel for transporting nitrogen with the inner wall of the micro-pipe 1. The nitrogen channel 5 is distributed along the bottom of the inner wall of the micro-pipe 1 from beginning to end. One end of the nitrogen channel 5 is installed with a nitrogen gas pipeline 7, and the nitrogen gas pipeline 7 is used to connect to external nitrogen. A plurality of exhaust pipes 9 are installed on the nitrogen channel 5, and the exhaust pipes 9 are arranged at intervals along the distribution path of the nitrogen channel 5. The nitrogen in the nitrogen channel 5 is discharged into the microchannel 1 through the exhaust pipes 9. A plurality of float-type automatic exhaust valves 6 are installed on the micro-pipe 1, and the float-type automatic exhaust valves 6 are arranged at intervals along the distribution path of the micro-pipe 1. The float-type automatic exhaust valve 6 is a prior art and can be directly purchased commercially. It is mainly used to discharge the nitrogen accumulated in the upper part of the micro-pipe 1.

[0032] As Figure 2 、 Figure 3As shown, each group of microchannels 1 has a straight structure. The three groups are connected in series through elbow pipes. At the bottom of the outer wall of each group of microchannels 1, there is an installation shell 8. The installation shell 8 has a cuboid structure. The upper part of the installation shell 8 is integrally and fixedly sealed and connected to the microchannel 1. The lower part of the installation shell 8 passes through the jacket 4 and is hermetically connected to the jacket 4. A plurality of first chambers 25 are opened in the upper part of the installation shell 8. The first chambers 25 are cylindrical cavity structures. The first chambers 25 are arranged vertically at intervals along a straight line. A second chamber 26 is opened in the lower part of the installation shell 8. The second chamber 26 is a cuboid cavity structure. The second chamber 26 communicates with a plurality of first chambers 25. A piston rod 11 and a driving mechanism are installed in the first chamber 25. The piston rod 11 passes through the microchannel 1 and extends into the exhaust pipe 9. A sliding seal connection is provided between the microchannel 1 and the piston rod 11. At the top of the piston rod 11, there is a piston plate 10 matching the exhaust pipe 9. The driving mechanism is used to push the piston rod 11 to reciprocate up and down and make the piston plate 10 open or close the exhaust pipe 9.

[0033] In some embodiments, the driving mechanism can use a crank - connecting rod structure. This crank - connecting rod structure can push the piston rod 11 and the piston plate 10 to move up and down together. When the piston plate 10 moves downward, the exhaust pipe 9 is opened. When the piston plate 10 moves upward, the exhaust pipe 9 is closed.

[0034] Preferably, as Figure 4 shown, the driving mechanism includes an upper top plate 12, a first spring 13, a lower baffle 14, a plurality of pushing blocks 16, a connecting rod 17, an inclined - section cylinder 19, a second spring 23, and a driving motor 18. The upper top plate 12, the first spring 13, and the lower baffle 14 are located in the first chamber 25. The piston rod 11 passes through the microchannel 1, the upper top plate 12, the first spring 13, and the lower baffle 14 from top to bottom and extends into the second chamber 26. The upper top plate 12 is fixedly connected to the microchannel 1. A sliding seal connection is provided between the upper top plate 12 and the piston rod 11. The first spring 13 is sleeved on the piston rod 11. The lower baffle 14 is fixedly connected to the piston rod 11. As Figure 5 shown, the first spring 13 presses the lower baffle 14 downward, making the piston rod 11 and the piston plate 10 tend to move downward. As Figure 5 、 Figure 6 、 Figure 7 shown, the pushing blocks 16, the connecting rod 17, the inclined - section cylinder 19, and the second spring 23 are located in the second chamber 26. The pushing block 16 is provided with a slot 33 with a low middle and high ends. The slot 33 is an inverted trapezoid. The bottom end of the piston rod 11 pushes against different height positions of the slot 33 corresponding to the opening or closing of the exhaust pipe 9 by the piston plate 10. When the piston rod 11 pushes against the inclined plane of the slot 33, the piston plate 10 closes the exhaust pipe 9. When the piston rod 11 pushes against the plane of the slot 33, the piston plate 10 opens the exhaust pipe 9. There are a plurality of connecting rods 17, and they jointly fix and connect a plurality of pushing blocks 16 together. As Figure 6As shown in the figure, one end of the connecting rod 17 is installed with an outer cylinder 21, an inner cylinder 22, and a fixing column 24. Both the outer cylinder 21 and the inner cylinder 22 are tubular structures with one end open. A part of the inner cylinder 22 is sleeved inside the outer cylinder 21, and the outer cylinder 21 is slidably connected to the inner cylinder 22. The openings of the outer cylinder 21 and the inner cylinder 22 are arranged opposite to each other. The fixing column 24 is in two sections, which are respectively fixed on the axes of the outer cylinder 21 and the inner cylinder 22. The second spring 23 is located between the outer cylinder 21 and the inner cylinder 22. The second spring 23 is sleeved on the fixing column 24. The fixing column 24 passes through the outer cylinder 21 and is fixedly connected to the outer cylinder 21. The fixing column 24 is fixedly connected to the connecting rod 17 through a pushing block 16. The other end of the connecting rod 17 is installed with an arc head 20. The arc head 20 pushes against the inclined surface of the inclined-section cylinder 19. The driving motor 18 is used to drive the inclined-section cylinder 19 to rotate and push the connecting rod 17 and the pushing block 16 to slide back and forth.

[0035] The driving motor 18 is of a vane-type pneumatic motor structure. The exhaust port of the driving motor 18 is communicated with the nitrogen gas pipeline 7. The output end of the driving motor 18 passes through the mounting shell 9 and is fixedly connected to the axis center of the inclined-section cylinder 19. For a vane-type pneumatic motor to rotate normally, at least one exhaust pipe 9 must be in an open state to ensure gas flow. Therefore, the adjacent piston plates 10 are set to have opposite states of opening or closing the exhaust pipe 9, so that the pneumatic motor operates stably and normally.

[0036] A roller 15 is installed at the bottom end of the piston rod 11. The roller 15 is pivotally connected to the piston rod 11. The roller 15 pushes open the slot 33. The roller 15 can make the pushing block 16 push the piston rod 11 to move upward more stably and smoothly, reducing the friction and wear between the piston rod 11 and the slot 33.

[0037] As Figure 8As shown, a rotating shaft 28, an eccentric column 29, and a sliding plate 27 are installed in the second chamber 26. The rotating shaft 28 passes through the mounting shell 8 and is rotatably connected thereto. The rotating shaft 28 is fixedly connected to the axis of the eccentric column 29. The sliding plate 27 is located between the eccentric column 29 and the pushing block 16. The eccentric column 29 pushes the sliding plate 27 upward. The sliding plate 27 is slidably connected to the pushing block 16. The widths among the sliding plate 27, the pushing block 16, and the second chamber 26 are equal. The pushing block 16 and the sliding plate 27 are both stuck in the second chamber 26. The setting of the sliding plate 27 can convert the line contact between the pushing block 16 and the eccentric column 29 into the surface contact between the sliding plate 27 and the pushing block 16, so that the pushing block 16 will not deflect during the left and right sliding process, and at the same time, it also plays a certain wear-resistant role. The eccentric column 29 rotates to push the sliding plate 27, the outer cylinder 21, the inner cylinder 22, the connecting rod 17, the second spring 23, the fixed column 24, and the pushing block 16 to slide up and down in the second chamber 26. The eccentric column 29 rotates upward and sequentially pushes all the piston rods 11 and the piston plates 10 upward through the pushing block 16 to close all the exhaust pipes 9, so as to prevent the reaction liquid from flowing back into the nitrogen channel 5. A regulating handwheel 30 is arranged on the outer part of the mounting shell 8 where the rotating shaft 28 is located.

[0038] The elastic force of the first spring 13 and the gravity of the sliding plate 27, the pushing block 16, and the connecting rod 17 cooperate to press down and push the eccentric column 29 to rotate. A stop mechanism must be installed to prevent this situation. The stop mechanism includes a ratchet 31 and a stop pawl 31. The ratchet 31 is sleeved on the rotating shaft 28, and a stop pawl 32 matched with the ratchet 31 is arranged on the mounting shell 8. <{

[0039] Working principle: As Figure 9As shown in the figure, nitrogen is introduced into the intake end of the driving motor 18 of the pneumatic motor structure. The ammonia gas pushes the driving motor 16 to rotate. The driving motor 16 drives the inclined-section cylinder 19 to rotate. The rotation of the inclined-section cylinder 19 can push the connecting rod 17 and the pushing block 16 to slide left and right on the sliding plate 27. During the sliding process, the pushing block 16 will push the piston rod 11 upward. The piston rod 11 will drive the piston plate 10 to move upward to block the exhaust pipe 9. When the pushing block 16 returns, the first spring 13 squeezes and drives the lower baffle 14 to move downward, and at the same time drives the piston rod 11 and the piston plate 10 to move downward. The piston plate 10 moves downward until it opens the exhaust pipe 9. Nitrogen enters the micro-pipe 1 through the exhaust pipe 9, realizing the aeration effect in the micro-pipe 1. The piston plate 10 continuously opening or closing the exhaust pipe 9 can achieve the pulsed aeration effect, and the gas-liquid mixing effect is better than continuous ventilation. The nitrogen accumulated in the reaction liquid will float and accumulate above the liquid surface, and the excess nitrogen will be discharged through the float-type automatic exhaust valve 5; when it is necessary to completely block the exhaust pipe 9, rotate the adjusting handwheel 30. The adjusting handwheel drives the rotating shaft 28 and the eccentric column 29 to rotate. The eccentric column 29 pushes the sliding plate ۲۷, the pushing block 16, the piston rod 11, and the piston plate 10 upward. The original piston plate 10 blocking the exhaust pipe 9 continues to move upward in the exhaust pipe 9, still achieving the blocking effect. The original piston plate 10 that did not block the exhaust pipe 9 moves upward, realizing the blocking of the exhaust pipe 9. The two together achieve the function of completely blocking the exhaust pipe 9, avoiding the problem of the reaction liquid flowing back into the nitrogen channel 5 after the gas is cut off; the cooperation of the ratchet and the stop claw can fix the eccentric column in the state of completely blocking the exhaust pipe 9.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded 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 within the protection scope of the present invention.

Claims

1. A nadic anhydride microchannel production device, characterized in that: It includes a micro-pipe (1), an outer heat exchange jacket (4) is arranged outside the micro-pipe (1), a nitrogen channel (5) is arranged inside the micro-pipe (1), the nitrogen channel (5) is distributed along the bottom of the inner wall of the micro-pipe (1), one end of the nitrogen channel (5) is provided with a nitrogen gas pipeline (7), a plurality of exhaust pipes (9) are arranged on the nitrogen channel (5), the exhaust pipes (9) are arranged at intervals along the distribution path of the nitrogen channel (5), a plurality of floating ball type automatic exhaust valves (6) are arranged on the micro-pipe (1), and the floating ball type automatic exhaust valves (6) are arranged at intervals along the distribution path of the micro-pipe (1).

2. The Nadic anhydride microchannel production equipment according to claim 1, characterized in that: An installation shell (8) is arranged at the bottom of the outer wall of the micro-pipe (1), the installation shell (8) is of a cuboid structure, the upper part of the installation shell (8) is fixedly connected to the micro-pipe (1), a plurality of first chambers (25) are arranged in the upper part of the installation shell (8), the first chambers (25) are arranged at intervals in a straight line, a second chamber (26) is arranged in the lower part of the installation shell (8), the second chamber (26) communicates with the plurality of first chambers (25), a piston rod (11) and a driving mechanism are arranged in the first chamber (25), the piston rod (11) passes through the micro-pipe (1) and extends into the exhaust pipe (9), a sliding seal connection is arranged between the micro-pipe (1) and the piston rod (11), a piston plate (10) matching the exhaust pipe (9) is arranged at the top of the piston rod (11), and the driving mechanism is used to push the piston rod (11) to reciprocate up and down and make the piston plate (10) open or close the exhaust pipe (9).

3. The Nadic anhydride microchannel production equipment according to claim 2, characterized in that: The driving mechanism includes an upper top plate (12), a first spring (13), a lower baffle (14), a plurality of pushing blocks (16), a connecting rod (17), an inclined-section cylinder (19), a second spring (23), and a driving motor (18). The upper top plate (12), the first spring (13), and the lower baffle (14) are located in the first chamber (25). The piston rod (11) sequentially passes through the micro-pipe (1), the upper top plate (12), the first spring (13), and the lower baffle (14) from top to bottom and extends into the second chamber (26). The upper top plate (12) is fixedly connected to the micro-pipe (1), and there is a sliding seal connection between the upper top plate (12) and the piston rod (11). The first spring (13) is sleeved on the piston rod (11). The lower baffle (14) is fixedly connected to the piston rod (11). The pushing blocks (16), the connecting rod (17), the inclined-section cylinder (19), and the second spring (23) are located in the second chamber (26). The pushing block (16) is provided with a slot (33) that is lower in the middle and higher at both ends. The bottom end of the piston rod (11) pushes against different height positions of the slot (33), corresponding to the piston plate (10) opening or closing the exhaust pipe (9). The connecting rod (17) fixedly connects and strings together a plurality of pushing blocks (16). The second spring (23) is located at one end of the connecting rod (17) and pushes the connecting rod (17) and the pushing block (16) to slide towards the other end. The other end of the connecting rod (17) is provided with a round arc head (20), and the round arc head (20) pushes against the inclined surface of the inclined-section cylinder (19). The driving motor (18) is used to drive the inclined-section cylinder (19) to rotate and push the connecting rod (17) and the pushing block (16) to slide reciprocally.

4. A nadic anhydride microchannel production device according to claim 3, characterized in that: The driving motor (18) is of a pneumatic motor structure. The exhaust port of the driving motor (18) is communicated with the nitrogen gas pipeline (7). The output end of the driving motor (18) is fixedly connected to the axis of the inclined-section cylinder (19). The states of adjacent piston plates (10) opening or closing the exhaust pipe (9) are opposite.

5. A nadic anhydride microchannel production device according to any one of claims 3 or 4, characterized in that: The bottom end of the piston rod (11) is provided with a roller (15). The roller (15) is pivotally connected to the piston rod (11) by a shaft, and the roller (15) pushes against the slot (33).

6. A nadic anhydride microchannel production device according to any one of claims 3 or 4, characterized in that: A rotating shaft (28) and an eccentric column (29) are arranged in the second chamber (26). The rotating shaft (28) passes through the mounting shell (8) and is rotatably connected thereto. The rotating shaft (28) is fixedly connected to the axis of the eccentric column (29). The eccentric column (29) is slidably connected to the pushing block (16). One end of the connecting rod (17) is provided with an outer cylinder (21) and an inner cylinder (22). Both the outer cylinder (21) and the inner cylinder (22) are cylindrical structures with one end open. A part of the inner cylinder (22) is sleeved inside the outer cylinder (21), and the outer cylinder (21) is slidably connected to the inner cylinder (22). The second spring (23) is located between the outer cylinder (21) and the inner cylinder (22). The outer cylinder (21) is fixedly connected to the connecting rod (17). The eccentric column (29) rotates to push the outer cylinder (21), the inner cylinder (22), the connecting rod (17), and the pushing block (16) to slide up and down in the second chamber (26). The eccentric column (29) sequentially pushes the pushing block (16), the piston rod (11), and the piston plate (10) upward to move upward for closing all the exhaust pipes (9). An adjusting handwheel (30) is arranged on the outer upper part of the mounting shell (8) where the rotating shaft (28) is located.

7. The Nadic anhydride microchannel production equipment according to claim 6, characterized in that: A sliding plate (27) is arranged in the second chamber (26). The sliding plate (27) is located between the eccentric column (29) and the pushing block (16).

8. A nadic anhydride microchannel production device according to claim 6, characterized in that: A ratchet wheel (31) is arranged on the rotating shaft (28), and a stop pawl (32) matched with the ratchet wheel (31) is arranged on the mounting shell (8).

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