Recovery mechanism and method for production of headspace solvent dimethylacetamide

Abstract

The invention belongs to the technical field of dimethylacetamide recovery, and particularly relates to a recovery mechanism and method for headspace solvent dimethylacetamide production, the recovery mechanism comprises a reaction kettle, and a recovery tank is arranged in the reaction kettle. When a fire occurs around, air in a U-shaped ring groove is heated and expanded to push a piston to move upwards, a plurality of ejector rods are driven to move together, the bottom of an overturning strip is pushed in the direction close to a plurality of drying holes, the drying holes are blocked, the lower portion of the inner wall of the overturning strip pushes a push rod to move in the direction close to a valve rod along the inner wall of a guide hole, and the valve rod is closed. The whole valve rod is pushed upwards, the valve rod moves upwards, the plug is driven to move upwards, the valve rod is uncovered from the top of the filling guide hole, liquid nitrogen in the liquid nitrogen gas cylinder is gasified and enters the distributing valve through the filling guide pipe and the filling guide hole, then the liquid nitrogen is sprayed out of the distributing valve through the distributing holes, and the sprayed liquid nitrogen enters the heat insulation ring cavity. The heat insulation effect is achieved, and dimethylacetamide is prevented from being burnt at high temperature to be subjected to thermal decomposition.

Description

Technical Field

[0001] The invention belongs to the technical field of dimethylacetamide recovery, and specifically relates to a recovery mechanism and method for producing headspace solvent dimethylacetamide. Background Art

[0002] Dimethylacetamide is a commonly used non-protonic polar solvent. It is a colorless, transparent liquid that is flammable and can be mixed with organic solvents such as water, alcohol, ether, ester, benzene, chloroform and aromatic compounds. It is used in pharmaceuticals and synthetic resins. It is also used as a solvent for polyacrylonitrile spinning and as an extractive distillation solvent for separating styrene from the C8 fraction. It is prepared by the reaction of dimethylamine and acetyl chloride. In the production process of dimethylacetamide, recovery agencies are usually used to collect it.

[0003] The existing recovery mechanism for dimethylacetamide production cannot be insulated from the outside. When a fire occurs around, the flame burning the outer wall of the device will cause the temperature of the device to rise. The heat will be transferred to dimethylacetamide through the device, causing the dimethylacetamide stored inside the device to undergo thermal decomposition due to the high temperature. Summary of the invention

[0004] The purpose of the present invention is to provide a recovery mechanism and method for the production of headspace solvent dimethylacetamide to solve the problems pointed out in the above background technology.

[0005] The present invention provides the following technical scheme: a recovery mechanism for producing dimethylacetamide, a headspace solvent, comprises a reactor, a recovery tank is arranged inside the reactor, a trigger component is arranged at the bottom of the reactor, a heat-insulating ring cavity is opened inside the reactor, a plurality of stop grooves distributed at equal angles are opened on the inner wall of the heat-insulating ring cavity on one side close to the center of the reactor, airtight components are movably arranged inside the stop grooves, a plurality of drying holes distributed up and down are opened through the inner wall of the stop groove on one side close to the center of the reactor, a drying and heat-insulating component is fixedly arranged at the bottom of the reactor, a plurality of conducting holes are opened through the bottom of the reactor, and the conducting holes extend to the inside;

[0006] The trigger component comprises a U-shaped annular groove fixedly mounted on the bottom of the reactor, an insulating baffle is fixedly mounted inside the U-shaped annular groove, the insulating baffle divides the inside of the U-shaped annular groove into two upper and lower cavity parts, a plurality of conduction ports distributed at equal angles are penetrated through the inner wall of one side of the U-shaped annular groove close to the center of the circle, the conduction ports are located at the top of the insulating baffle, a piston is slidably mounted inside the U-shaped annular groove, the piston is located at the bottom of the conduction port, a plurality of push rods distributed at equal angles are fixedly mounted on the top of the piston, the push rods movably penetrate the insulating baffle and the bottom of the reactor, and extend to the inside of the reactor, a plurality of heated feathers distributed at equal angles are fixedly mounted on the bottom of the U-shaped annular groove;

[0007] The airtight component includes a hinge pin rotatably installed on the upper part of the stop groove, and a flip bar is fixedly installed on the outer wall of the hinge pin. The flip bar is movably located inside the stop groove. The position of the flip bar corresponds to the position of the push rod, and a wedge force surface is provided on the lower part of a side of the flip bar away from the drying hole, and the surface of the wedge force surface abuts against the top of the push rod.

[0008] As a preferred solution of the present invention, a pillow plate is fixedly installed on the inner wall of the reactor, the recovery tank is fixedly placed on the top of the pillow plate, and the pillow plate is located on the top of the multiple conduction ports.

[0009] As a preferred solution of the present invention, the drying and heat-insulating component includes a connecting base fixedly installed on the lower part of the inner wall of the U-shaped annular groove, a connecting outer frame fixedly installed on the bottom of the connecting base, a drying cylinder is screwed to the inside of the connecting outer frame through a thread, a plurality of drying openings distributed at equal angles are opened through the inner wall of the drying cylinder, and the drying openings are divided into upper and lower layers, the drying openings are all connected to the interior of the drying cylinder, and a base plate is fixedly installed on the bottom of the drying cylinder.

[0010] As a preferred solution of the present invention, a liquid nitrogen cylinder is fixedly installed on the top of the base plate, the liquid nitrogen cylinder is located inside the drying cylinder, and the gap between the outer wall of the liquid nitrogen cylinder and the inner wall of the drying cylinder is 1 to 3 cm, the top output port of the liquid nitrogen cylinder is fixedly installed with an irrigation conduit through a thread, the top of the irrigation conduit is fixedly installed with a donation valve, the bottom of the donation valve is penetrated by an irrigation guide hole, the irrigation guide hole is located at the top of the irrigation conduit, and the interior of the donation valve and the interior of the irrigation conduit are connected through the irrigation guide hole, a valve stem is slidably installed on the top of the donation valve, the valve stem slides and extends to the interior of the donation valve, and a plug is fixedly installed on the bottom of the valve stem, the plug is located at the top of the irrigation guide hole, and the bottom of the plug is fitted with the bottom wall of the donation valve, the four corners of the donation valve are penetrated by donation holes, and a plurality of fixing rods are fixedly installed between the top of the donation valve and the bottom of the pillow plate.

[0011] As a preferred solution of the present invention, a push rod is slidably installed on one side of the stop groove close to the center of the reactor, and the push rod slides and extends to the inside of the stop groove and the inside of the reactor, one end of the push rod abuts against the lower part of the inner side surface of the flip bar, and a guide ring is fixedly installed on the end of the push rod away from the flip bar, and the outer wall of the guide ring abuts against the inclined surface opened at the bottom of the valve stem, and a plurality of guide frames are fixedly installed on the top of the dispenser valve, and guide holes are penetrated through the upper parts of the sides of the plurality of guide frames, and the inner wall of the guide hole is slidably connected to the outer wall of the push rod.

[0012] As a preferred solution of the present invention, a conical cap is slidably mounted on the outer wall of the irrigation tube, the outer wall of the conical cap is conically arranged, the outer wall of the push rod is fixedly mounted with a push bar, the bottom of the push bar is in contact with the outer wall of the conical cap, a plurality of fifth springs distributed at equal angles are fixedly mounted on the top of the conical cap, the top of the fifth spring is fixedly connected to the bottom of the donation valve, and the diameter of the conical cap is larger than the inner diameter of the connecting base.

[0013] As a preferred solution of the present invention, a telescopic groove is provided on the side of the flip bar close to the center of the reactor, a telescopic block is slidably installed inside the telescopic groove, a sealing gasket is fixedly installed on the side of the telescopic block away from the telescopic groove, a plurality of second springs distributed up and down are fixedly installed on the side of the telescopic block away from the sealing gasket, one end of the plurality of second springs away from the telescopic block is fixedly connected to the inner wall of the telescopic groove, a socket is fixedly installed on the side of the flip bar away from the telescopic groove, a plurality of retaining springs are fixedly installed on the inner wall of the insulation ring cavity away from the center of the reactor, the position of the retaining spring corresponds to the position of the retaining spring, and the retaining spring is movably inserted into the inside of the retaining spring.

[0014] As a preferred solution of the present invention, a third spring is fixedly installed between the top of the valve stem and the bottom of the pillow plate, a reset ring is fixedly installed on the outer wall of the push rod, a fourth spring is fixedly installed between the reset ring and the guide frame, and the fourth spring is sleeved on the periphery of the push rod, and the periphery of the push rod is sleeved with a first spring, and the first spring is fixedly installed between the top of the piston and the bottom of the insulating partition.

[0015] As a preferred solution of the present invention, a recovery pipe is fixedly installed on the lower part of the outer wall of the reactor, the interior of the recovery pipe is connected with the interior of the insulation ring cavity, a check valve is fixedly installed on the end of the recovery pipe away from the reactor, two telescopic rods are slidably installed on the outer wall of the reactor, the two telescopic rods are symmetrically distributed about the center of the reactor, and the two telescopic rods both slide and extend to the interior of the insulation ring cavity, a grip ring is fixedly installed on one end of the telescopic rod, a connecting plate is fixedly installed on the end of the telescopic rod away from the grip ring, a sixth spring is provided on the outer periphery of the telescopic rod, the sixth spring is fixedly installed between the inner wall of the insulation ring cavity on one side away from the center of the reactor and the connecting plate, two triangular plates are fixedly installed on the side of the connecting plate away from the sixth spring, the two triangular plates are located on both sides of one of the flip bars, wherein limiting rods are fixedly installed on the tops of the two top rods, and the outer walls of the limiting rods are respectively abutted against the bottom inclined surfaces of the two triangular plates.

[0016] As a preferred solution of the present invention, the top of the reactor is provided with a plurality of conduction holes distributed at equal angles, and the conduction holes extend to the interior of the insulation ring cavity. The top of the reactor is detachably threaded with a top cover, the interior of the top cover is a cavity-type structure, and the bottom of the top cover is provided with a plurality of air holes distributed at equal angles, and the positions of the air holes correspond one-to-one to the positions of the conduction holes.

[0017] A recovery method of a recovery mechanism for the production of headspace solvent dimethylacetamide:

[0018] S1. Fill the interior of the drying cylinder with appropriate amount of soda lime in advance, fill the interior of the liquid nitrogen cylinder with liquid nitrogen, add dimethylacetamide into the interior of the recovery tank, and place the recovery tank on the top of the pillow plate inside the reactor, then seal the top cover on the top of the reactor, and make the positions of each air connection hole correspond to each conduction hole;

[0019] S2. When moisture appears inside the recovery tank, the moisture is transferred to the inside of the stop groove through multiple drying holes, and then enters the inside of the insulation ring cavity and the conduction hole through the stop groove, and enters the inside of the U-shaped ring groove through the conduction hole. Under the blocking effect of the insulation partition, the moisture inside the U-shaped ring groove will enter the top area of ​​the connecting base through multiple conduction ports, and then enter the gap area between the liquid nitrogen bottle and the inner wall of the connecting base to the drying cylinder and the liquid nitrogen bottle, and then enter the inside of the drying cylinder through multiple drying ports. The moisture will be absorbed by the soda lime inside the drying cylinder;

[0020] S3. When a fire occurs around the reactor, the flames burn the multiple heated feathers, causing the multiple heated feathers to heat up quickly and transfer heat to the inside of the U-shaped ring groove. The air inside the U-shaped ring groove expands due to the heat, pushing the piston upward, driving the multiple push rods upward, and under the action of the top of the push rod and the wedge force of the wedge force surface, the bottom of the flip bar is pushed toward the direction close to the multiple drying holes, so that the flip bar is flipped along the outer wall of the hinge pin toward the direction of the drying holes. The flip bar drives the sealing gasket to flip together through the telescopic block until the sealing gasket is tightly fitted on the inner wall of the stop groove near the drying holes, thereby blocking the multiple drying holes. At this time, the interior of the reactor cannot pass through the multiple drying holes opened on the side wall and the stop groove. The through groove and even the inside of the heat-insulating ring cavity form a conducting effect. When the push rod moves upward, it will drive the limit rod to move upward. Under the action of the wedge force between the limit rod and the bottom inclined surface of the triangular plate, the triangular plate and the connecting plate are pushed to move in the direction away from the flip bar. The connecting plate drives the telescopic rod to move together, so that the sixth spring is compressed and stores force. When the sealing gasket fits the inner wall of the stop groove, the push rod just stops moving upward. At this time, the push rod just drives the limit rod to move upward to the top of the triangular plate. The wedge force between the limit rod and the bottom inclined surface of the triangular plate disappears. Under the action of the rebound force of the sixth spring, the telescopic rod, the connecting plate and the triangular plate are driven to slide in the direction of the flip bar. The top of the triangular plate contacts the lower part of the outer wall of the limit rod to limit the limit rod.

[0021] S4. During the process of the flipping strip flipping toward the drying hole, the lower inner wall of the flipping strip pushes the push rod to move along the inner wall of the guide hole toward the valve stem. During the process of the push rod moving toward the valve stem, the valve stem is pushed upward as a whole under the action of the wedge force between the guide ring and the contact surface of the valve stem. The valve stem moves upward, driving the plug to move upward and be uncovered from the top of the filling guide hole. At this time, the liquid nitrogen inside the liquid nitrogen cylinder absorbs heat and vaporizes, enters the interior of the bushing valve through the filling conduit and the filling guide hole, and then is ejected to the outside of the bushing valve through multiple filling holes. The ejected liquid nitrogen enters the interior of the U-shaped ring groove through multiple conduction ports, and is located inside the area where the top of the insulation partition is located. The liquid nitrogen entering the top area of ​​the insulation partition will quickly enter the stop groove through multiple conduction holes. ), the liquid nitrogen that enters the stop groove under the blocking effect of the sealing gasket on the multiple drying holes cannot enter the reactor through the drying holes, and is directly discharged to the inside of the heat insulation ring cavity through the stop groove, so that the inside of the heat insulation ring cavity is filled with liquid nitrogen. Since the temperature of the liquid nitrogen is extremely low, it can absorb the heat generated by the flame burning the outer wall of the reactor, cool the side wall of the reactor, and avoid the thermal decomposition of dimethylacetamide in the recovery tank under the action of high temperature, thereby improving the storage safety of dimethylacetamide, and the liquid nitrogen that enters the heat insulation ring cavity will also enter the inside of the top cover through the multiple conduction holes and the air connection hole, thereby absorbing the heat generated by the burning of the top cover, and avoiding the heat from being conducted from the top of the reactor to the inside thereof;

[0022] S5. When the lower part of the inner wall of the flip bar pushes the push rod to move, the push rod will also drive the push bar to move together, and the conical cap will be pushed downward under the action of the wedge force between its bottom and the conical outer wall of the conical cap. Multiple fifth springs are stretched and stored, and the conical cap moves downward and rests on the bottom wall of the connecting base, preventing the liquid nitrogen sprayed from the dispensing hole from entering the gap area between the drying cylinder and the liquid nitrogen cylinder, thereby preventing the liquid nitrogen from entering the interior of the drying cylinder through multiple drying ports, so that more liquid nitrogen can be discharged into the interior of the thermal insulation ring cavity.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. When a recovery mechanism for producing dimethylacetamide, a headspace solvent, is used in the present invention, when a fire occurs in the surrounding area, the air inside the U-shaped ring groove expands due to heat and pushes the piston upward, driving multiple push rods to move upward, and under the action of the wedge force between the top of the push rod and the wedge force surface, the bottom of the flip bar is pushed toward the direction close to the multiple drying holes, thereby blocking the drying holes. The lower part of the inner wall of the flip bar pushes the push rod to move along the inner wall of the guide hole toward the direction close to the valve stem. During the process of the push rod moving toward the valve stem, when the guide ring contacts the valve stem, the push rod moves toward the valve stem. The wedge force of the surface pushes the valve stem upward as a whole, and the valve stem moves upward, driving the plug to move upward and be uncovered from the top of the filling guide hole. At this time, the liquid nitrogen inside the liquid nitrogen cylinder enters the interior of the dispensing valve through the filling conduit and the filling guide hole under the pressure inside the liquid nitrogen cylinder, and then sprays out to the outside of the dispensing valve through multiple dispensing holes. The sprayed liquid nitrogen enters the interior of the U-shaped ring groove through multiple conduction ports, and then enters the interior of the insulation ring cavity, which plays a role in isolating heat and preventing dimethylacetamide from being burned by high temperature and thermally decomposed.

[0025] 2. When the recovery mechanism for producing dimethylacetamide, a headspace solvent, is in use, the push rod is pushed to move by the lower part of the inner wall of the flip bar, and the push rod drives the push bar to move together, and the conical cap is pushed downward under the action of the wedge force between the bottom of the push rod and the conical outer wall of the conical cap, and multiple fifth springs are stretched and stored, and the conical cap moves downward to abut against the bottom wall of the connecting base, preventing the liquid nitrogen sprayed from the dispensing hole from entering the gap area between the drying cylinder and the liquid nitrogen cylinder, thereby preventing the liquid nitrogen from entering the interior of the drying cylinder through multiple drying ports, so that more liquid nitrogen can be discharged into the interior of the insulation ring cavity, further improving the utilization rate of the liquid nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of a recovery mechanism for producing dimethylacetamide, a headspace solvent, in the present invention;

[0027] Figure 2 It is a schematic diagram of a three-dimensional structure of a recovery mechanism for producing dimethylacetamide, a headspace solvent, in the present invention, from a first viewing angle;

[0028] Figure 3 It is a schematic diagram of a cross-sectional three-dimensional structure from a second viewing angle of a recovery mechanism for producing dimethylacetamide, a headspace solvent, in the present invention;

[0029] Figure 4 A recovery mechanism for the production of dimethylacetamide, a headspace solvent, in the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0030] Figure 5 A recovery mechanism for the production of dimethylacetamide, a headspace solvent, in the present invention Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0031] Figure 6 A recovery mechanism for the production of dimethylacetamide, a headspace solvent, in the present invention Figure 3 Schematic diagram of the enlarged structure at C in the middle;

[0032] Figure 7 A recovery mechanism for the production of dimethylacetamide, a headspace solvent, in the present invention Figure 3 Schematic diagram of the enlarged structure at D in the middle;

[0033] Figure 8 It is a cross-sectional structural schematic diagram of a recycling mechanism dispensing valve for producing dimethylacetamide, a headspace solvent, in the present invention;

[0034] Fig. 9 It is a schematic cross-sectional view of a flip bar of a recovery mechanism for producing dimethylacetamide, a headspace solvent, in the present invention;

[0035] Fig.10 A recovery mechanism for the production of dimethylacetamide, a headspace solvent, in the present invention Fig. 9 Schematic diagram of the enlarged structure at E in the middle.

[0036] In the figure: 1. Reactor; 101. Insulating ring cavity; 102. Stop groove; 103. Drying hole; 104. Pillow plate; 105. Conducting hole; 107. Conducting hole; 108. Recovery pipe; 109. Stop valve; 2. Recovery tank; 301. U-shaped ring groove; 302. Insulating baffle; 303. Conducting port; 304. Piston; 305. Ejector rod; 306. First spring; 307. Heated feather; 401. Hinge pin; 402. Turning bar; 403. Wedge force surface; 404. Telescopic groove; 405. Telescopic block; 406. Sealing pad; 407. Second spring; 408. Card seat; 409. Circlip; 501. Connecting base; 502. Connecting outer frame; 503. Drying cylinder; 504, drying port; 505, bottom plate; 506, liquid nitrogen cylinder; 507, irrigation catheter; 508, dispensing valve; 509, irrigation guide hole; 5010, valve stem; 5011, plug; 5012, dispensing hole; 5013, push rod; 5014, guide ring; 5015, third spring; 5016, reset ring; 5017, fourth spring; 5018, guide frame; 5019, guide hole; 5020, conical cap; 5021, push strip; 5022, fifth spring; 5023, fixing rod; 7, top cover; 701, air connection hole; 8, telescopic rod; 801, grip ring; 802, connecting plate; 803, sixth spring; 804, triangle plate; 805, limit rod. DETAILED DESCRIPTION

[0037] 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.

[0038] See also Figure 1-9 The technical solution provided by the present invention specifically includes the following embodiments:

[0039] Embodiment 1

[0040] A recovery mechanism for producing dimethylacetamide, a headspace solvent, comprises a reactor 1, a recovery tank 2 is arranged inside the reactor 1, a trigger component is arranged at the bottom of the reactor 1, a heat-insulating ring cavity 101 is opened inside the reactor 1, a plurality of stop grooves 102 distributed at equal angles are opened on the inner wall of the heat-insulating ring cavity 101 on one side close to the center of the reactor 1, an airtight component is movably arranged inside the stop groove 102, a plurality of drying holes 103 distributed up and down are penetrated through the inner wall of the stop groove 102 on one side close to the center of the reactor 1, a drying and heat-insulating component is fixedly arranged at the bottom of the reactor 1, a plurality of conducting holes 105 are penetrated through the bottom of the reactor 1, and the conducting holes 105 extend to the inside of the stop groove 102, a pillow plate 104 is fixedly installed on the inner wall of the reactor 1, and the recovery tank 2 is fixedly placed on the top of the pillow plate 104;

[0041] The trigger component includes a U-shaped annular groove 301 fixedly installed at the bottom of the reactor 1, an insulating baffle 302 is fixedly installed inside the U-shaped annular groove 301, and the insulating baffle 302 divides the inside of the U-shaped annular groove 301 into two upper and lower cavity parts, and the inner wall of the U-shaped annular groove 301 close to the center of the circle is penetrated with a plurality of conduction ports 303 distributed at equal angles, the pillow plate 104 is located at the top of the plurality of conduction ports 303, and the conduction ports 303 are located at the top of the insulating baffle 302, and a piston 304 is slidably installed inside the U-shaped annular groove 301, and the piston 304 is located at the bottom of the conduction port 303, and a plurality of push rods 305 distributed at equal angles are fixedly installed on the top of the piston 304, and the push rods 305 movably penetrate the insulating baffle 302 and the bottom of the reactor 1, and extend to the inside of the reactor 1;

[0042] The drying and heat-insulating component includes a connecting base 501 fixedly installed at the lower part of the inner wall of the U-shaped annular groove 301, a connecting outer frame 502 is fixedly installed at the bottom of the connecting base 501, a drying cylinder 503 is screwed inside the connecting outer frame 502 through a thread, a plurality of drying openings 504 distributed at equal angles are opened through the inner wall of the drying cylinder 503, and the drying openings 504 are divided into upper and lower layers, and the drying openings 504 are all connected to the inside of the drying cylinder 503, and a bottom plate 505 is fixedly installed at the bottom of the drying cylinder 503;

[0043] Specifically, the drying cylinder 503 is filled with appropriate amount of soda lime in advance, dimethylacetamide is added into the recovery tank 2, and the recovery tank 2 is placed on the top of the pillow plate 104 inside the reactor 1, and then the top cover 7 is sealed on the top of the reactor 1, and the positions of the air receiving holes 701 and the conduction holes 107 are made to correspond. When moisture appears inside the recovery tank 2, the moisture is transferred to the inside of the stop groove 102 through the multiple drying holes 103, and then enters the inside of the insulation ring cavity 101 and the conduction hole 105 through the stop groove 102, and passes through the conduction hole 107. 05 enters the U-shaped annular groove 301. Under the blocking effect of the insulating baffle 302, the moisture inside the U-shaped annular groove 301 will enter the top area of ​​the connecting base 501 through the multiple conduction ports 303, and then enter the gap area between the drying cylinder 503 and the liquid nitrogen cylinder 506 through the gap between the liquid nitrogen cylinder 506 and the inner wall of the connecting base 501, and then enter the interior of the drying cylinder 503 through the multiple drying ports 504. The moisture will be absorbed by the soda lime inside the drying cylinder 503, so that dimethylacetamide can be stored in a moisture-proof manner to avoid the hydrolysis reaction of dimethylacetamide.

[0044] Embodiment 2

[0045] The airtight component includes a hinge pin 401 rotatably mounted on the upper part of the stop groove 102, a flip bar 402 is fixedly mounted on the outer wall of the hinge pin 401, the flip bar 402 is movably located inside the stop groove 102, the position of the flip bar 402 corresponds to the position of the ejector rod 305, and a wedge force surface 403 is formed at the lower part of a side surface of the flip bar 402 away from the drying hole 103, and the surface of the wedge force surface 403 abuts against the top of the ejector rod 305;

[0046] A liquid nitrogen cylinder 506 is fixedly installed on the top of the bottom plate 505. The liquid nitrogen cylinder 506 is located inside the drying tube 503, and the gap between the outer wall of the liquid nitrogen cylinder 506 and the inner wall of the drying tube 503 is 1 to 3 cm. An irrigation conduit 507 is fixedly installed on the top output port of the liquid nitrogen cylinder 506 through a thread. A dispensing valve 508 is fixedly installed on the top of the irrigation conduit 507. An irrigation guide hole 509 is opened through the bottom of the dispensing valve 508. The irrigation guide hole 509 is located at the top of the irrigation conduit 507, and the interior of the dispensing valve 508 and the irrigation conduit 507 are The inside is connected through the irrigation hole 509, a valve stem 5010 is slidably installed on the top of the dispensing valve 508, the valve stem 5010 slides and extends to the inside of the dispensing valve 508, and a plug 5011 is fixedly installed on the bottom of the valve stem 5010, the plug 5011 is located at the top of the irrigation hole 509, and the bottom of the plug 5011 is in contact with the bottom wall of the dispensing valve 508, and the four corners of the dispensing valve 508 are penetrated by dispensing holes 5012, and a plurality of fixing rods 5023 are fixedly installed between the top of the dispensing valve 508 and the bottom of the pillow plate 104;

[0047] A push rod 5013 is slidably installed on one side of the stop groove 102 close to the center of the reactor 1. The push rod 5013 slides and extends to the inside of the stop groove 102 and the inside of the reactor 1. One end of the push rod 5013 abuts against the lower part of the inner side surface of the flip bar 402. A guide ring 5014 is fixedly installed on the end of the push rod 5013 away from the flip bar 402. The outer wall of the guide ring 5014 abuts against the inclined surface opened at the bottom of the valve stem 5010. A plurality of guide frames 5018 are fixedly installed on the top of the dispenser valve 508. Guide holes 5019 are opened through the upper parts of the sides of the plurality of guide frames 5018. The inner wall of the guide hole 5019 is slidably connected to the outer wall of the push rod 5013. A plurality of heated feathers 307 distributed at equal angles are fixedly installed on the bottom of the U-shaped annular groove 301.

[0048] The top of the reactor 1 is provided with a plurality of conducting holes 107 distributed at equal angles, and the conducting holes 107 extend to the inside of the heat-insulating ring cavity 101. The top of the reactor 1 is detachably threadedly connected with a top cover 7, and the inside of the top cover 7 is a cavity-type structure, and the bottom of the top cover 7 is provided with a plurality of air receiving holes 701 distributed at equal angles, and the positions of the air receiving holes 701 correspond one to one with the positions of the conducting holes 107.

[0049] Specifically, in this embodiment, when a fire occurs around the reactor 1, the flames burn the multiple heated feathers 307, causing the multiple heated feathers 307 to heat up quickly and transfer the heat to the inside of the U-shaped annular groove 301. The air inside the U-shaped annular groove 301 expands due to the heat, pushing the piston 304 to move upward. The piston 304 moves upward, driving the multiple push rods 305 to move upward. Under the action of the top of the push rod 305 and the wedge force of the wedge force surface 403, the bottom of the flip bar 402 is pushed toward the direction close to the multiple drying holes 103, so that the flip bar 402 flips along the outer wall of the hinge pin 401 toward the direction of the drying hole 103, and the flip bar 402 drives the sealing gasket 406 to flip together through the telescopic block 405 until the sealing gasket 406 is tightly fitted in the stop groove 1 02 is on the inner wall of one side close to the drying hole 103, so that multiple drying holes 103 can be blocked. At this time, the interior of the reactor 1 cannot form a conduction effect with the stop groove 102 or even the interior of the insulation ring cavity 101 through the multiple drying holes 103 opened on the side wall. At the same time, during the process of the flip bar 402 flipping toward the direction of the drying hole 103, the lower part of the inner wall of the flip bar 402 pushes the push rod 5013 to move along the inner wall of the guide hole 5019 toward the direction close to the valve stem 5010. During the movement of the push rod 5013 toward the valve stem 5010, the valve stem 5010 is pushed upward as a whole under the action of the wedge force of the contact surface between the guide ring 5014 and the valve stem 5010. The valve stem 5010 moves upward, driving the plug 5011 to move upward, and from the top of the irrigation hole 509 Open, at this time, the liquid nitrogen inside the liquid nitrogen bottle 506 absorbs heat and vaporizes, enters the inside of the dispensing valve 508 through the filling tube 507 and the filling hole 509, and then sprays out to the outside of the dispensing valve 508 through the multiple dispensing holes 5012, and the sprayed liquid nitrogen enters the inside of the U-shaped annular groove 301 through the multiple conduction ports 303, and is located inside the area where the top of the insulating baffle 302 is located. It should be noted that the insulating baffle 302 is made of super-strong insulating material, so the temperatures in the top and bottom areas of the insulating baffle 302 are not easy to exchange heat, and the liquid nitrogen entering the top area of ​​the insulating baffle 302 will quickly enter the inside of the stop groove 102 through the multiple conduction holes 105, and enter under the blocking effect of the sealing gasket 406 on the multiple drying holes 103. The liquid nitrogen entering the stop groove 102 cannot enter the reactor 1 through the drying hole 103, and is directly discharged to the inside of the insulation ring cavity 101 through the stop groove 102, so that the inside of the insulation ring cavity 101 is filled with liquid nitrogen. Since the temperature of liquid nitrogen is extremely low, it can absorb the heat generated by the flame burning the outer wall of the reactor 1, cool the side wall of the reactor 1, and avoid the thermal decomposition of dimethylacetamide in the recovery tank 2 under high temperature, thereby improving the storage safety of dimethylacetamide. In addition, the liquid nitrogen entering the insulation ring cavity 101 will also enter the inside of the top cover 7 through multiple conduction holes 107 and the air receiving holes 701, thereby absorbing the heat generated by the burning of the top cover 7 and avoiding the heat from being conducted from the top of the reactor 1 to the inside.

[0050] Furthermore, a telescopic groove 404 is provided on one side of the flip bar 402 close to the center of the reactor 1, a telescopic block 405 is slidably installed inside the telescopic groove 404, a sealing gasket 406 is fixedly installed on one side of the telescopic block 405 away from the telescopic groove 404, and a plurality of second springs 407 distributed up and down are fixedly installed on one side of the telescopic block 405 away from the sealing gasket 406, and one end of the plurality of second springs 407 away from the telescopic block 405 is fixedly connected to the inner wall of the telescopic groove 404, a holder 408 is fixedly installed on one side of the flip bar 402 away from the telescopic groove 404, and a plurality of retaining springs 409 are fixedly installed on the inner wall of the side of the insulation ring cavity 101 away from the center of the reactor 1, the position of the retaining spring 409 corresponds to the position of the retaining spring 408, and the retaining spring 409 is movably inserted in the inside of the retaining spring 408, when the push rod 305 moves upward, the push rod 305 When the end of 05 and the wedge force of the wedge force surface 403 push the flip bar 402 to flip along the hinge pin 401 in the direction of the drying hole 103, the flip bar 402 drives the telescopic block 405, the sealing gasket 406 and the multiple second springs 407 to move together, so that the sealing gasket 406 first abuts against the inner wall of the stop groove 102 close to the drying hole 103, so that as the flip bar 402 continues to flip, the sealing gasket 406 is subjected to the reaction force of the inner wall of the stop groove 102, pushing the telescopic block 405 to slide inside the telescopic groove 404, causing the multiple second springs 407 to be compressed and produce elastic force, and further under the action of the rebound force of the second spring 407, the telescopic block 405 and the sealing gasket 406 are pushed up, so that the sealing gasket 406 is in close contact with the inner wall of the stop groove 102, thereby preventing liquid nitrogen from entering the interior of the reactor 1 through the drying hole 103.

[0051] Embodiment 3

[0052] A conical cap 5020 is slidably mounted on the outer wall of the irrigation conduit 507. The outer wall of the conical cap 5020 is conical. A push bar 5021 is fixedly mounted on the outer wall of the push rod 5013. The bottom of the push bar 5021 abuts against the outer wall of the conical cap 5020. A plurality of fifth springs 5022 distributed at equal angles are fixedly mounted on the top of the conical cap 5020. The top of the fifth spring 5022 is fixedly connected to the bottom of the dispensing valve 508. The diameter of the conical cap 5020 is larger than the inner diameter of the connecting base 501.

[0053] Specifically, in this embodiment, when the lower inner wall of the flip bar 402 pushes the push rod 5013 to move, the push rod 5013 will also drive the push bar 5021 to move together, and the conical cap 5020 will be pushed downward under the action of the wedge force between its bottom and the conical outer wall of the conical cap 5020, and the multiple fifth springs 5022 are stretched and stored. The conical cap 5020 moves downward and presses against the bottom wall of the connecting base 501, preventing the liquid nitrogen sprayed from the dispensing hole 5012 from entering the gap area between the drying cylinder 503 and the liquid nitrogen cylinder 506, thereby preventing the liquid nitrogen from entering the interior of the drying cylinder 503 through the multiple drying ports 504, so that more liquid nitrogen can be discharged into the interior of the insulating ring cavity 101, further improving the utilization rate of the liquid nitrogen.

[0054] Embodiment 4

[0055] A recovery pipe 108 is fixedly installed at the lower part of the outer wall of the reactor 1, and the interior of the recovery pipe 108 is connected to the interior of the heat-insulating ring cavity 101. A stop valve 109 is fixedly installed at one end of the recovery pipe 108 away from the reactor 1. Two telescopic rods 8 are slidably installed on the outer wall of the reactor 1. The two telescopic rods 8 are symmetrically distributed about the center of the reactor 1, and the two telescopic rods 8 are slidably extended to the interior of the heat-insulating ring cavity 101. A grip ring 801 is fixedly installed at one end of the telescopic rod 8, and a connecting ring 801 is fixedly installed at the end of the telescopic rod 8 away from the grip ring 801. The connecting plate 802 and the outer periphery of the telescopic rod 8 are sleeved with a sixth spring 803, which is fixedly installed between the inner wall of the side of the heat-insulating ring cavity 101 away from the center of the reactor 1 and the connecting plate 802, and two triangular plates 804 are fixedly installed on the side of the connecting plate 802 away from the sixth spring 803, and the two triangular plates 804 are located on both sides of one of the flip bars 402, wherein the tops of the two top rods 305 are fixedly installed with limit rods 805, and the outer walls of the limit rods 805 are respectively in contact with the bottom inclined surfaces of the two triangular plates 804;

[0056] A third spring 5015 is fixedly installed between the top of the valve stem 5010 and the bottom of the pillow plate 104, a reset ring 5016 is fixedly installed on the outer wall of the push rod 5013, a fourth spring 5017 is fixedly installed between the reset ring 5016 and the guide frame 5018, and the fourth spring 5017 is sleeved on the periphery of the push rod 5013, and a first spring 306 is sleeved on the periphery of the push rod 305, and the first spring 306 is fixedly installed between the top of the piston 304 and the bottom of the insulation partition 302;

[0057] Specifically, in this embodiment, when the push rod 305 moves upward, it will drive the limit rod 805 to move upward. Under the action of the wedge force between the limit rod 805 and the bottom inclined surface of the triangle plate 804, the triangle plate 804 and the connecting plate 802 are pushed away from the flip bar 402. The connecting plate 802 drives the telescopic rod 8 to move together, so that the sixth spring 803 is compressed and stored. When the sealing gasket 406 fits the inner wall of the stop groove 102, the push rod 305 just stops moving upward. At this time, the push rod 305 just drives the limit rod 805 to move upward. The rod 805 moves upward to the top of the triangle plate 804, and the wedge force between the limiting rod 805 and the bottom inclined surface of the triangle plate 804 disappears. Under the action of the rebound force of the sixth spring 803, the telescopic rod 8, the connecting plate 802 and the triangle plate 804 slide in the direction of the flip bar 402. The top of the triangle plate 804 contacts the lower part of the outer wall of the limiting rod 805, limiting the limiting rod 805 to prevent the limiting rod 805 from moving downward, thereby limiting the top rod 305 and the piston 304 through the limiting rod 805.

[0058] When the push rod 5013 drives the guide ring 5014 to move and push the valve stem 5010 upward, the valve stem 5010 moves upward so that the fixing rod 5023 is compressed and stored. As a result, after the fire is over, the air temperature on the surface of the heated feather 307 and the inside of the U-shaped ring groove 301 gradually decreases, and the pressure inside the U-shaped ring groove 301 decreases. The rebound force of the first spring 306 has the potential energy to push the piston 304 to return downward. However, due to the limiting effect of the top of the triangular plate 804 on the bottom of the limiting rod 805, the push rod 305 and the piston 304 cannot return downward. At this time, the input end of the suction pump for collecting nitrogen outside is connected to the output end of the recovery pipe 108, and the non-passing valve 109 is opened to suck away the nitrogen inside the insulation ring cavity 101 and the top cover 7 through the recovery pipe 108. When the nitrogen inside the insulation ring cavity 101 and the top cover 7 is completely sucked away, the grip ring 801 is manually pulled to drive the telescopic rod 8 , the connecting plate 802 and the connecting triangular plate 804 move in the direction away from the flip bar 402 until the triangular plate 804 slides off the bottom of the limit rod 805, the resilience of the first spring 306 is released, pushing the push rod 305 and the piston 304 to move downward, and under the resilience of the retaining spring 409, the flip bar 402 is pulled to flip along the hinge pin 401 in the direction away from the drying hole 103, the resilience of the fourth spring 5017 pushes the reset ring 5016 and the push rod 5013 to reset, the valve stem 5010 resets downward under the resilience of the fixing rod 5023, and drives the plug 5011 to block the top of the irrigation hole 509 again, the reset of the push rod 5013 also drives the push strip 5021 to move together, so that the wedge force of the push strip 5021 on the conical outer wall of the conical cap 5020 disappears, and the resilience of the fifth spring 5022 drives the conical cap 5020 to reset upward.

[0059] A recovery method of a recovery mechanism for the production of headspace solvent dimethylacetamide:

[0060] S1. Fill the interior of the drying cylinder 503 with appropriate amount of soda lime in advance, and fill the interior of the liquid nitrogen cylinder 506 with liquid nitrogen, add dimethylacetamide into the interior of the recovery tank 2, and place the recovery tank 2 on the top of the pillow plate 104 inside the reactor 1, and then seal the top cover 7 on the top of the reactor 1, and make the positions of the air receiving holes 701 correspond to the positions of the conduction holes 107;

[0061] S2. When moisture appears inside the recovery tank 2, the moisture is transferred to the inside of the stop groove 102 through the multiple drying holes 103, and then enters the inside of the insulation ring cavity 101 and the guide hole 105 through the stop groove 102, and enters the inside of the U-shaped ring groove 301 through the guide hole 105. Under the blocking effect of the insulation partition 302, the moisture inside the U-shaped ring groove 301 will enter the top area of ​​the connecting base 501 through the multiple conduction ports 303, and then enter the gap area between the drying cylinder 503 and the liquid nitrogen cylinder 506 through the gap between the liquid nitrogen cylinder 506 and the inner wall of the connecting base 501, and then enter the inside of the drying cylinder 503 through the multiple drying ports 504. The moisture will be absorbed by the soda lime inside the drying cylinder 503;

[0062] S3. When a fire occurs around the reactor 1, the flames burn the multiple heated feathers 307, causing the multiple heated feathers 307 to heat up quickly and transfer heat to the inside of the U-shaped ring groove 301. The air inside the U-shaped ring groove 301 expands due to the heat, pushing the piston 304 to move upward, driving the multiple push rods 305 to move upward, and under the action of the top of the push rod 305 and the wedge force of the wedge force surface 403, the bottom of the flip bar 402 is pushed toward the direction close to the multiple drying holes 103, so that the flip bar 402 flips along the outer wall of the hinge pin 401 toward the direction of the drying hole 103, and the flip bar 402 drives the sealing gasket 406 to flip together through the telescopic block 405 until the sealing gasket 406 is tightly attached to the inner wall of the stop groove 102 near the drying hole 103, thereby blocking the multiple drying holes 103. At this time, the interior of the reactor 1 cannot be connected to the stop groove 102 or even the partition through the multiple drying holes 103 opened on the side wall. When the top rod 305 moves upward, the limiting rod 805 is driven to move upward. Under the action of the wedge force between the limiting rod 805 and the bottom inclined surface of the triangular plate 804, the triangular plate 804 and the connecting plate 802 are pushed to move away from the flip bar 402. The connecting plate 802 drives the telescopic rod 8 to move together, so that the sixth spring 803 is compressed and stores force. When the sealing gasket 406 is in contact with the inner wall of the stop groove 102, the top rod 305 just stops moving upward. At this time, the top rod 305 just drives the limiting rod 805 to move upward to the top of the triangular plate 804. The wedge force between the limiting rod 805 and the bottom inclined surface of the triangular plate 804 disappears. Under the action of the rebound force of the sixth spring 803, the telescopic rod 8, the connecting plate 802 and the triangular plate 804 are driven to slide in the direction of the flip bar 402. The top of the triangular plate 804 contacts the lower part of the outer wall of the limiting rod 805, and the limiting rod 805 is limited.

[0063] S4. During the process of the flipping strip 402 flipping toward the drying hole 103, the lower inner wall of the flipping strip 402 pushes the push rod 5013 to move along the inner wall of the guide hole 5019 toward the valve stem 5010. During the process of the push rod 5013 moving toward the valve stem 5010, the push ring 5014 pushes the valve stem 5010 upward as a whole under the action of the wedge force of the contact surface between the valve stem 5010 and the push ring 5014. The valve stem 5010 moves upward, driving the plug 5011 to move upward and be uncovered from the top of the filling guide hole 509. At this time, the liquid nitrogen inside the liquid nitrogen cylinder 506 absorbs heat and vaporizes, enters the inside of the dispensing valve 508 through the filling conduit 507 and the filling guide hole 509, and then is ejected to the outside of the dispensing valve 508 through multiple dispensing holes 5012. The ejected liquid nitrogen then enters the inside of the U-shaped annular groove 301 through multiple conduction ports 303, and is located inside the area where the top of the thermal insulation partition 302 is located, and enters the thermal insulation partition 302. The liquid nitrogen in the top area of ​​02 quickly enters the interior of the stop groove 102 through the multiple conducting holes 105. Due to the blocking effect of the sealing gasket 406 on the multiple drying holes 103, the liquid nitrogen entering the stop groove 102 cannot enter the interior of the reactor 1 through the drying holes 103, and is directly discharged to the interior of the heat insulation ring cavity 101 through the stop groove 102, so that the interior of the heat insulation ring cavity 101 is filled with liquid nitrogen. Since the temperature of liquid nitrogen is extremely low, it can absorb the heat generated by the flame burning the outer wall of the reactor 1, cool the side wall of the reactor 1, avoid the thermal decomposition of dimethylacetamide in the recovery tank 2 under the action of high temperature, and improve the storage safety of dimethylacetamide. In addition, the liquid nitrogen entering the heat insulation ring cavity 101 will also enter the interior of the top cover 7 through the multiple conducting holes 107 and the air receiving hole 701, thereby absorbing the temperature of the top cover 7 being burned, and avoiding the temperature from being transmitted from the top of the reactor 1 to its interior;

[0064] S5. When the lower part of the inner wall of the flip bar 402 pushes the push rod 5013 to move, the push rod 5013 also drives the push bar 5021 to move together. The push bar 5021 moves, and the wedge force between its bottom and the conical outer wall of the conical cap 5020 pushes the conical cap 5020 downward. The multiple fifth springs 5022 are stretched and stored, and the conical cap 5020 moves downward and rests on the bottom wall of the connecting base 501, so that the liquid nitrogen sprayed from the dispensing hole 5012 will not enter the gap area between the drying cylinder 503 and the liquid nitrogen cylinder 506, and therefore will not enter the interior of the drying cylinder 503 through the multiple drying ports 504, so that more liquid nitrogen can be discharged into the interior of the insulating ring cavity 101.

[0065] In the present invention, a recovery mechanism for producing dimethylacetamide, a headspace solvent, is used for operation. The interior of the drying cylinder 503 is filled with appropriate soda lime in advance, and the interior of the liquid nitrogen cylinder 506 is filled with liquid nitrogen. Dimethylacetamide is added into the interior of the recovery tank 2, and the recovery tank 2 is placed on the top of the pillow plate 104 inside the reactor 1. Then, the top cover 7 is sealed on the top of the reactor 1, and the positions of the air receiving holes 701 and the conducting holes 107 are made to correspond.

[0066] When moisture appears inside the recovery tank 2, the moisture is transferred to the inside of the stop groove 102 through the multiple drying holes 103, and then enters the inside of the insulation ring cavity 101 and the guide hole 105 through the stop groove 102, and enters the inside of the U-shaped ring groove 301 through the guide hole 105. Under the blocking effect of the insulation partition 302, the moisture inside the U-shaped ring groove 301 will enter the top area of ​​the connecting base 501 through the multiple conduction ports 303, and then enter the gap area between the drying cylinder 503 and the liquid nitrogen cylinder 506 through the gap between the liquid nitrogen cylinder 506 and the inner wall of the connecting base 501, and then enter the inside of the drying cylinder 503 through the multiple drying ports 504. The moisture will be absorbed by the soda lime inside the drying cylinder 503, so that the dimethylacetamide can be stored in a moisture-proof manner to prevent the dimethylacetamide from being hydrolyzed.

[0067] When a fire occurs around the reactor 1, the flames burn the plurality of heated feathers 307, causing the plurality of heated feathers 307 to heat up rapidly and transfer the heat to the inside of the U-shaped annular groove 301. The air inside the U-shaped annular groove 301 expands due to the heat, pushing the piston 304 upward. The piston 304 moves upward, driving the plurality of push rods 305 to move upward. Further, under the action of the wedge force of the top of the push rod 305 and the wedge force surface 403, the bottom of the flip bar 402 is pushed toward the direction close to the plurality of drying holes 103. The turning bar 402 turns along the outer wall of the hinge pin 401 toward the drying hole 103. The turning bar 402 turns and further drives the sealing gasket 406 to turn together through the telescopic block 405 until the sealing gasket 406 is tightly attached to the inner wall of the stop groove 102 near the drying hole 103, thereby blocking the multiple drying holes 103. At this time, the interior of the reactor 1 cannot form a conduction effect with the stop groove 102 or even the interior of the heat insulation ring cavity 101 through the multiple drying holes 103 opened on the side wall. When the push rod 305 moves upward, it will drive the limit rod 805 to move upward, so that under the action of the wedge force between the limit rod 805 and the bottom inclined surface of the triangle plate 804, the triangle plate 804 and the connecting plate 802 are pushed to move away from the flip bar 402. The movement of the connecting plate 802 further drives the telescopic rod 8 to move together, causing the sixth spring 803 to be compressed and stored. When the sealing gasket 406 fits the inner wall of the stop groove 102, the push rod 305 just stops moving upward. At this time, the push rod 305 drives the limit rod 80 5 just moves upward to the top of the triangle plate 804, the wedge force between the limiting rod 805 and the bottom inclined surface of the triangle plate 804 disappears, and the resilience of the sixth spring 803 drives the telescopic rod 8, the connecting plate 802 and the triangle plate 804 to slide in the direction of the flip bar 402, and the top of the triangle plate 804 contacts the lower part of the outer wall of the limiting rod 805, thereby limiting the limiting rod 805 and preventing the limiting rod 805 from moving downward, and further limiting the top rod 305 and the piston 304 through the limiting rod 805;

[0068] At the same time, during the process of the flipping strip 402 flipping toward the drying hole 103, the lower inner wall of the flipping strip 402 pushes the push rod 5013 to move along the inner wall of the guide hole 5019 toward the valve stem 5010. During the process of the push rod 5013 moving toward the valve stem 5010, the wedge force of the contact surface between the guide ring 5014 and the valve stem 5010 pushes the valve stem 5010 upward as a whole. The valve stem 5010 moves upward, driving the plug 5011 to move upward and be uncovered from the top of the irrigation hole 509. At this time, the liquid nitrogen in the liquid nitrogen cylinder 506 absorbs heat and vaporizes, enters the inside of the dispensing valve 508 through the filling tube 507 and the filling hole 509, and then sprays out to the outside of the dispensing valve 508 through the multiple dispensing holes 5012. The sprayed liquid nitrogen enters the inside of the U-shaped annular groove 301 through the multiple conduction ports 303, and is located inside the area where the top of the insulating baffle 302 is located. It should be noted that the insulating baffle 302 is made of super-strong insulating material, so the top area and bottom area of ​​the insulating baffle 302 are The liquid nitrogen in the top area of ​​the heat-insulating partition 302 will quickly enter the interior of the stop groove 102 through the multiple conduction holes 105. Under the blocking effect of the sealing gasket 406 on the multiple drying holes 103, the liquid nitrogen entering the stop groove 102 cannot enter the interior of the reactor 1 through the drying holes 103, and is directly discharged to the interior of the heat-insulating ring cavity 101 through the stop groove 102, so that the interior of the heat-insulating ring cavity 101 is filled with liquid nitrogen. Since the temperature of the liquid nitrogen is extremely low, it can absorb the heat generated by the flame burning the outer wall of the reactor 1, cool the side wall of the reactor 1, and avoid the thermal decomposition of dimethylacetamide in the recovery tank 2 under the action of high temperature, thereby improving the storage safety of dimethylacetamide. In addition, the liquid nitrogen entering the heat-insulating ring cavity 101 will also enter the interior of the top cover 7 through the multiple conduction holes 107 and the air receiving hole 701, thereby absorbing the heat generated by the burning of the top cover 7, and avoiding the heat from being conducted from the top of the reactor 1 to the interior thereof.

[0069] When the lower part of the inner wall of the flip bar 402 pushes the push rod 5013 to move, the push rod 5013 will also drive the push bar 5021 to move together, and the conical cap 5020 will be pushed downward under the action of the wedge force between its bottom and the conical outer wall of the conical cap 5020, and the multiple fifth springs 5022 are stretched and stored. The conical cap 5020 moves downward and presses against the bottom wall of the connecting base 501, preventing the liquid nitrogen sprayed from the dispensing hole 5012 from entering the gap area between the drying cylinder 503 and the liquid nitrogen cylinder 506, thereby preventing the liquid nitrogen from entering the interior of the drying cylinder 503 through the multiple drying ports 504, so that more liquid nitrogen can be discharged into the interior of the insulating ring cavity 101, further improving the utilization rate of the liquid nitrogen.

[0070] 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 recovery mechanism for the production of headspace solvent dimethylacetamide, characterized in that: The invention comprises a reaction kettle (1), wherein a recovery tank (2) is provided inside the reaction kettle (1), a trigger component is provided at the bottom of the reaction kettle (1), a heat-insulating ring cavity (101) is provided inside the reaction kettle (1), a plurality of stop grooves (102) distributed at equal angles are provided on the inner wall of the heat-insulating ring cavity (101) on one side close to the center of the reaction kettle (1), an airtight component is movably provided inside the stop grooves (102), a plurality of drying holes (103) distributed up and down are penetrated through the inner wall of the stop groove (102) on one side close to the center of the reaction kettle (1), a drying and heat-insulating component is fixedly provided at the bottom of the reaction kettle (1), a plurality of conducting holes (105) are penetrated through the bottom of the reaction kettle (1), and the conducting holes (105) extend to the inside of (102); The trigger component comprises a U-shaped annular groove (301) fixedly mounted on the bottom of the reaction kettle (1); a heat-insulating baffle (302) is fixedly mounted inside the U-shaped annular groove (301); the heat-insulating baffle (302) divides the inside of the U-shaped annular groove (301) into two upper and lower cavity parts; a plurality of conduction ports (303) distributed at equal angles are formed through an inner wall of one side of the U-shaped annular groove (301) close to the center of the circle; the conduction ports (303) are located on the top of the heat-insulating baffle (302); A piston (304) is slidably mounted inside the U-shaped annular groove (301), the piston (304) being located at the bottom of the conduction port (303), a plurality of push rods (305) distributed at equal angles being fixedly mounted on the top of the piston (304), the push rods (305) movably passing through the insulation baffle (302) and the bottom of the reactor (1), and extending to the inside of the reactor (1), a plurality of heat-receiving feathers (307) distributed at equal angles being fixedly mounted on the bottom of the U-shaped annular groove (301); The airtight component comprises a hinge pin (401) rotatably mounted on the upper part of the stop groove (102); a flip bar (402) is fixedly mounted on the outer wall of the hinge pin (401); the flip bar (402) is movably located inside the stop groove (102); the position of the flip bar (402) corresponds to the position of the push rod (305); and a wedge force surface (403) is provided at the lower part of a side surface of the flip bar (402) away from the drying hole (103); the surface of the wedge force surface (403) abuts against the top of the push rod (305).

2. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 1, characterized in that: A pillow plate (104) is fixedly mounted on the inner wall of the reaction kettle (1), and the recovery tank (2) is fixedly placed on the top of the pillow plate (104), and the pillow plate (104) is located on the top of the multiple conduction ports (303).

3. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 2, characterized in that: The drying and heat-insulating component comprises a connecting base (501) fixedly mounted on the lower part of the inner wall of the U-shaped annular groove (301); a connecting outer frame (502) is fixedly mounted on the bottom of the connecting base (501); a drying cylinder (503) is screwed onto the interior of the connecting outer frame (502) via threads; a plurality of drying openings (504) distributed at equal angles are formed through the inner wall of the drying cylinder (503); the drying openings (504) are arranged in multiple layers at upper and lower levels; the drying openings (504) are all in communication with the interior of the drying cylinder (503); and a base plate (505) is fixedly mounted on the bottom of the drying cylinder (503).

4. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 3, characterized in that: A liquid nitrogen bottle (506) is fixedly installed on the top of the bottom plate (505), and the liquid nitrogen bottle (506) is located inside the drying tube (503), and the gap between the outer wall of the liquid nitrogen bottle (506) and the inner wall of the drying tube (503) is 1 to 3 cm. An irrigation conduit (507) is fixedly installed on the top output port of the liquid nitrogen bottle (506) through a thread, and a dispensing valve (508) is fixedly installed on the top of the irrigation conduit (507). An irrigation guide hole (509) is opened through the bottom of the irrigation valve (508), and the irrigation guide hole (509) is located at the top of the irrigation conduit (507), and the interior of the irrigation valve (508) and the irrigation conduit (507) are connected to each other. The interior is connected through the irrigation hole (509), a valve stem (5010) is slidably installed on the top of the donating valve (508), the valve stem (5010) slides and extends to the inside of the donating valve (508), and a plug (5011) is fixedly installed on the bottom of the valve stem (5010), the plug (5011) is located at the top of the irrigation hole (509), and the bottom of the plug (5011) is in contact with the bottom wall of the donating valve (508), the four corners of the donating valve (508) are penetrated by donating holes (5012), and a plurality of fixing rods (5023) are fixedly installed between the top of the donating valve (508) and the bottom of the pillow plate (104).

5. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 4, characterized in that: A push rod (5013) is slidably mounted on the side of the stop groove (102) close to the center of the reactor (1). The push rod (5013) slides and extends to the inside of the stop groove (102) and the inside of the reactor (1). One end of the push rod (5013) abuts against the lower part of the inner side surface of the flip bar (402). A guide ring (5014) is fixedly mounted on the end of the push rod (5013) away from the flip bar (402). The outer wall of the guide ring (5014) abuts against the inclined surface opened at the bottom of the valve stem (5010). A plurality of guide frames (5018) are fixedly mounted on the top of the dispenser valve (508). A guide hole (5019) is penetrated through the upper part of the side of the plurality of guide frames (5018). The inner wall of the guide hole (5019) is slidably connected to the outer wall of the push rod (5013).

6. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 5, characterized in that: A conical cap (5020) is slidably mounted on the outer wall of the irrigation tube (507), and the outer wall of the conical cap (5020) is conically configured. A push bar (5021) is fixedly mounted on the outer wall of the push rod (5013), and the bottom of the push bar (5021) abuts against the outer wall of the conical cap (5020). A plurality of fifth springs (5022) distributed at equal angles are fixedly mounted on the top of the conical cap (5020), and the top of the fifth spring (5022) is fixedly connected to the bottom of the dispensing valve (508). The diameter of the conical cap (5020) is larger than the inner diameter of the connecting base (501).

7. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 6, characterized in that: A telescopic groove (404) is provided on one side of the flip bar (402) close to the center of the reaction kettle (1), a telescopic block (405) is slidably installed inside the telescopic groove (404), a sealing gasket (406) is fixedly installed on one side of the telescopic block (405) away from the telescopic groove (404), and a plurality of second springs (407) distributed up and down are fixedly installed on one side of the telescopic block (405) away from the sealing gasket (406), and the plurality of second springs (407) are fixedly installed on the other side of the telescopic block (405) away from the sealing gasket (406). ) is fixedly connected to the inner wall of the telescopic slot (404) at one end away from the telescopic block (405); a holder (408) is fixedly installed on the side of the flip bar (402) away from the telescopic slot (404); a plurality of retaining springs (409) are fixedly installed on the inner wall of the side of the insulating ring cavity (101) away from the center of the reaction kettle (1); the position of the retaining springs (409) corresponds to the position of the retaining springs (408), and the retaining springs (409) are movably inserted into the interior of the retaining spring (408).

8. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 7, characterized in that: A third spring (5015) is fixedly installed between the top of the valve stem (5010) and the bottom of the pillow plate (104), a reset ring (5016) is fixedly installed on the outer wall of the push rod (5013), a fourth spring (5017) is fixedly installed between the reset ring (5016) and the guide frame (5018), and the fourth spring (5017) is sleeved on the periphery of the push rod (5013), and a first spring (306) is sleeved on the periphery of the push rod (305), and the first spring (306) is fixedly installed between the top of the piston (304) and the bottom of the insulation partition (302).

9. A recovery mechanism for the production of headspace solvent dimethylacetamide according to claim 8, characterized in that: A recovery pipe (108) is fixedly installed at the lower part of the outer wall of the reactor (1), the interior of the recovery pipe (108) is connected to the interior of the heat-insulating ring cavity (101), and a non-conducting valve (109) is fixedly installed at one end of the recovery pipe (108) away from the reactor (1). Two telescopic rods (8) are slidably installed on the outer wall of the reactor (1), the two telescopic rods (8) are symmetrically distributed about the center of the reactor (1), and the two telescopic rods (8) both slide and extend to the inside of the heat-insulating ring cavity (101), one end of the telescopic rod (8) is fixedly installed with a grip ring (801), and the end of the telescopic rod (8) away from the grip ring (801) is fixedly installed with a connecting plate (802), and the outer periphery of the telescopic rod (8) is provided with a sixth spring (803), and the sixth spring (803) is fixedly installed on the inner wall of the heat-insulating ring cavity (101) on one side away from the center of the reactor (1) and the connecting plate (802). 02), two triangular plates (804) are fixedly installed on one side of the connecting plate (802) away from the sixth spring (803), and the two triangular plates (804) are located on both sides of one of the flip bars (402), wherein the tops of the two top rods (305) are fixedly installed with limiting rods (805), and the outer walls of the limiting rods (805) are respectively abutted against the bottom inclined surfaces of the two triangular plates (804), and the top of the reactor (1) is provided with a plurality of conduction holes (107) distributed at equal angles, and the conduction holes (107) extend to the interior of the heat-insulating ring cavity (101), and the top of the reactor (1) is detachably threadedly connected with a top cover (7), the interior of the top cover (7) is a cavity-type structure, and the bottom of the top cover (7) is provided with a plurality of air receiving holes (701) distributed at equal angles, and the positions of the air receiving holes (701) correspond one to one with the positions of the conduction holes (107).

10. A method for recovering a headspace solvent dimethylacetamide produced by a recovery mechanism according to claims 1-9, characterized in that: S1. Fill the interior of the drying cylinder (503) with appropriate amount of soda lime in advance, and fill the interior of the liquid nitrogen cylinder (506) with liquid nitrogen, add dimethylacetamide into the interior of the recovery tank (2), and place the recovery tank (2) on the top of the pillow plate (104) inside the reactor (1), and then seal the top cover (7) on the top of the reactor (1), and make the positions of each air receiving hole (701) correspond to each conduction hole (107); S2. When moisture appears inside the recovery tank (2), the moisture is transferred to the inside of the stop groove (102) through the plurality of drying holes (103), then enters the inside of the heat-insulating ring cavity (101) and the conducting hole (105) through the stop groove (102), and enters the inside of the U-shaped ring groove (301) through the conducting hole (105). Under the blocking effect of the heat-insulating partition (302), the moisture inside the U-shaped ring groove (301) enters the top area of ​​the connecting base (501) through the plurality of conduction ports (303), and then enters the gap area between the drying cylinder (503) and the liquid nitrogen cylinder (506) through the gap between the inner wall of the connecting base (501), and then enters the inside of the drying cylinder (503) through the plurality of drying ports (504). The moisture is absorbed by the soda lime inside the drying cylinder (503); S3. When a fire occurs around the reactor (1), the flames burn the plurality of heated feathers (307), causing the plurality of heated feathers (307) to heat up rapidly and transfer the heat to the inside of the U-shaped annular groove (301). The air inside the U-shaped annular groove (301) expands due to the heat, pushing the piston (304) to move upward, driving the plurality of push rods (305) to move upward, and under the action of the wedge force of the top of the push rod (305) and the wedge force surface (403), the bottom of the flip bar (402) moves toward the direction close to the plurality of drying holes (103). The turning bar (402) is pushed so that it turns along the outer wall of the hinge pin (401) toward the drying hole (103). The turning bar (402) drives the sealing gasket (406) to turn together through the telescopic block (405) until the sealing gasket (406) is tightly attached to the inner wall of the stop groove (102) near the drying hole (103), thereby sealing the multiple drying holes (103). At this time, the interior of the reactor (1) cannot pass through the multiple drying holes (103) opened on the side wall and the stop groove (102) or even the heat insulation ring. The interior of the cavity (101) forms a conduction effect. When the push rod (305) moves upward, it drives the limit rod (805) to move upward. Under the action of the wedge force between the limit rod (805) and the bottom inclined surface of the triangular plate (804), the triangular plate (804) and the connecting plate (802) are pushed to move in a direction away from the flip bar (402). The connecting plate (802) drives the telescopic rod (8) to move together, so that the sixth spring (803) is compressed and stored. When the sealing pad (406) fits against the inner wall of the stop groove (102), the push rod (805) is pushed upward. When the top rod (305) just stops moving upward, the top rod (305) just drives the limiting rod (805) to move upward to the top of the triangular plate (804), and the wedge force between the limiting rod (805) and the bottom inclined surface of the triangular plate (804) disappears. Under the action of the rebound force of the sixth spring (803), the telescopic rod (8) and the connecting plate (802) slide together with the triangular plate (804) in the direction of the flip bar (402), and the top of the triangular plate (804) contacts the lower part of the outer wall of the limiting rod (805), thereby limiting the limiting rod (805); S4. During the process of the flipping strip (402) flipping toward the drying hole (103), the lower inner wall of the flipping strip (402) pushes the push rod (5013) to move along the inner wall of the guide hole (5019) toward the valve stem (5010). During the process of the push rod (5013) moving toward the valve stem (5010), the valve stem (5010) is pushed upward as a whole under the action of the wedge force between the contact surface of the guide ring (5014) and the valve stem (5010). The valve stem (5010) moves upward, driving the plug (5013) to move upward. 1) Move upward and uncover from the top of the filling hole (509). At this time, the liquid nitrogen in the liquid nitrogen bottle (506) absorbs heat and vaporizes, enters the inside of the dispensing valve (508) through the filling tube (507) and the filling hole (509), and then sprays out to the outside of the dispensing valve (508) through multiple dispensing holes (5012). The sprayed liquid nitrogen enters the inside of the U-shaped annular groove (301) through multiple conduction ports (303), and is located inside the area where the top of the insulation baffle (302) is located, and enters the insulation baffle (30 2) The liquid nitrogen in the top area will quickly enter the interior of the stop groove (102) through the multiple conducting holes (105). Under the blocking effect of the sealing gasket (406) on the multiple drying holes (103), the liquid nitrogen that has entered the interior of the stop groove (102) cannot enter the interior of the reactor (1) through the drying holes (103), and is directly discharged into the interior of the insulation ring cavity (101) through the stop groove (102), so that the interior of the insulation ring cavity (101) is filled with liquid nitrogen. Since the temperature of the liquid nitrogen is extremely low, it can absorb the flame's influence on the reactor. The heat generated by burning the outer wall of the reactor (1) cools the side wall of the reactor (1), thereby preventing the dimethylacetamide in the recovery tank (2) from being thermally decomposed under the action of high temperature, thereby improving the storage safety of the dimethylacetamide. In addition, the liquid nitrogen entering the heat-insulating ring cavity (101) also enters the interior of the top cover (7) through the multiple conduction holes (107) and the air receiving holes (701), thereby absorbing the heat generated by the burning of the top cover (7), thereby preventing the heat from being conducted from the top of the reactor (1) to the interior thereof. S5. When the lower part of the inner wall of the flip bar (402) pushes the push rod (5013) to move, the push rod (5013) also drives the push bar (5021) to move together, and the conical cap (5020) is pushed downward by the wedge force between the bottom of the push bar and the conical outer wall of the conical cap (5020). The plurality of fifth springs (5022) are stretched and force is accumulated, and the conical cap (5020) moves downward and abuts against the bottom wall of the connecting base (501), thereby preventing the liquid nitrogen sprayed from the dispensing hole (5012) from entering the gap area between the drying cylinder (503) and the liquid nitrogen bottle (506), thereby preventing the liquid nitrogen from entering the interior of the drying cylinder (503) through the plurality of drying ports (504), so that more liquid nitrogen can be discharged into the interior of the heat-insulating ring cavity (101).

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