A Distillation Apparatus for Recovering Methyl Methacrylate

Abstract

This invention pertains to the technical field of Methyl Methacrylate (MMA) and discloses a distillation apparatus for recovering MMA. The apparatus includes a distillation column body, which is provided with a heat shield section. The heat shield section includes a temperature sensor fixedly connected to the inner wall at the top of the distillation column body to monitor the temperature inside the distillation column body in real time. By activating the electric cylinder to retract, it drives the gear plate to move horizontally. The moving gear plate synchronously drives the installed bellows to extend, thereby drawing some high-temperature hot gas from the top of the distillation column body through one gas pipe and subsequently discharging it from the distillation column body through another gas pipe to prevent the temperature from continuously rising. When the electric cylinder extends again, the piston plate rod pushes and extrudes the pre-drawn cooling gas.

Description

A distillation apparatus for recovering methyl methacrylate Technical Field

[0001] This invention belongs to the field of methyl methacrylate technology, specifically a distillation apparatus for recovering methyl methacrylate. Background Technology

[0002] Methyl methacrylate is a monomer of polymethyl methacrylate (plexiglass). It can also be copolymerized with other vinyl monomers to obtain products with different properties. Its applications are very wide and it is commonly used in the manufacture of plexiglass, coatings, lubricant additives, plastics, adhesives, resins, wood impregnators, motor coil impregnators, ion exchange resins, paper varnishes, textile printing and dyeing auxiliaries, leather treatment agents, printing and dyeing auxiliaries, and insulating potting materials, etc.

[0003] Methyl methacrylate is commonly purified by distillation in the production process. The distillation method is usually heating, and the heating time and temperature need to be strictly controlled. The distillation column is preset with a specific temperature and heating time through a central control device. However, the distillation column will face heat accumulation after heating, causing the temperature in the distillation column to rise, which may exceed the initial set temperature. Methyl methacrylate may undergo a polymerization reaction, affecting the quality. Therefore, the stability of the methyl methacrylate distillation process cannot be guaranteed. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a distillation apparatus for recovering methyl methacrylate.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a distillation apparatus for recovering methyl methacrylate, comprising a distillation column body, wherein a heat protection section is provided in the distillation column body, the heat protection section including a temperature sensor fixedly connected to the inner wall of the top of the distillation column body for real-time monitoring of the temperature inside the distillation column body, and four L-shaped support plates are also fixedly connected in a circumferential manner to the inner wall of the distillation column body, an electric cylinder is fixedly connected to the outer wall of one end of one of the L-shaped support plates, and a compression structure is provided at the other end of the electric cylinder to disperse a small amount of high-temperature gas inside the distillation column body, and cold gas tanks are fixedly connected to the outer walls of both ends of the distillation column body, and a meshing piston structure is provided at one end of each of the two cold gas tanks. The compression structure is moved by the electric cylinder, which can contact and drive the two meshing piston structures to simultaneously draw in the cold gas from the two cold gas tanks, and mix it with the high-temperature hot gas inside the distillation column body, thereby cooling its interior.

[0006] Preferably, the extrusion structure includes a toothed plate fixedly connected to the other end of the electric cylinder, and a corrugated pipe fixedly connected to the other end of the toothed plate. The other end of the corrugated pipe is fixedly connected to an L-shaped support plate positioned opposite to the electric cylinder. The outer surfaces of the electric cylinder and the corrugated pipe are coated with fireproof and heat-insulating paint.

[0007] Preferably, gas pipes are fixedly connected to both ends of the corrugated pipe on the side away from the toothed plate, and a one-way valve is fixedly connected to each of the two gas pipes. The rod of one of the gas pipes is fixedly connected to the inner and outer walls of one end of the distillation column body, and the two gas pipes respectively serve the functions of one for drawing gas and one for conveying gas.

[0008] Preferably, each of the two meshing piston structures includes a spur gear, and a sleeve rod is movably sleeved on one end of the spur gear. One end of the sleeve rod is fixedly connected to the inner wall of the distillation column body.

[0009] Preferably, a piston rod is threadedly connected to the other end of the spur gear, and a telescopic positioning rod is fixedly connected to the rod body of the piston rod. One end of the telescopic positioning rod is fixedly connected to the inner wall of the distillation column body. The piston rod is specifically composed of two parts: a rubber disc and a metal rod. A piston cylinder is slidably connected to the piston rod, and one end of the outer wall of the piston cylinder is fixedly connected to the outer wall of one of the L-shaped support plates.

[0010] Preferably, a bent pipe is fixedly connected to one end of the piston cylinder, and a one-way valve is fixedly connected to the body of the bent pipe. Specifically, the bent pipe is also connected to an L-shaped support plate fixed on the bent pipe, and the other end of the bent pipe is fixedly connected to one end of the air tank.

[0011] Preferably, the inner wall of the piston cylinder is provided with a plurality of T-shaped grooves arranged in a circumferential manner, and a T-shaped plug can be intermittently slidably engaged in the inner wall of each T-shaped groove.

[0012] Preferably, a spring is fixedly connected to the outer wall of the top end of each T-shaped plug, and the top end of each spring is fixedly connected to the inner wall of the top end of each T-shaped groove.

[0013] Preferably, the piston cylinder is circumferentially and fixedly connected with multiple L-shaped tubes, one end of each L-shaped tube being respectively fixedly connected to one end of each T-shaped groove.

[0014] Preferably, an air cylinder is fixedly connected to the top end of each L-shaped tube, the bottom outer wall of each air cylinder is fixedly connected to the outer wall of the piston cylinder, and a wind turbine shaft is movably sleeved in the top inner wall of each air cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] This invention utilizes an electric cylinder mounted on an L-shaped support plate to retract, thereby causing the toothed plate to move horizontally. During this horizontal movement, the toothed plate simultaneously extends the installed bellows, generating a negative pressure suction force. This force draws in some high-temperature hot gas from the top of the distillation column through a gas pipe. When the electric cylinder extends passively, it can also draw out some of the high-temperature hot gas drawn from the bellows through another gas pipe from the distillation column, thereby reducing the amount of high-temperature gas inside the distillation column and preventing the temperature from rising continuously.

[0017] This invention utilizes the suction force generated by the translational movement of the piston rod to drive the T-shaped plug within the T-groove, causing it to slide and seal the groove opening. The translated T-shaped plug also pulls on the spring, causing it to deform. When the electric cylinder extends further, the piston rod pushes and compresses the pre-pumped cooling gas within the piston cylinder. The T-shaped plug, impacted by the cooling gas, immediately resets via the spring. The reset T-shaped plug no longer obstructs the L-shaped tube, allowing the cooling gas to be ejected from the L-shaped tube. This, in turn, drives the impeller shaft installed on the inner wall of the gas cylinder top to rotate, increasing airflow within the distillation column. Simultaneously, it allows for better fusion of the cooling gas and the hot gas within the distillation column, facilitating rapid cooling and preventing the polymerization reaction of methyl methacrylate, which would affect distillation quality. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of a partial cross-sectional structure of the distillation column body of the present invention;

[0020] Figure 3 is a schematic diagram of the overall structure of the heat-resistant part of the present invention;

[0021] Figure 4 is a partial enlarged structural diagram of point A in Figure 3 of the present invention;

[0022] Figure 5 is a partial enlarged structural diagram of point B in Figure 3 of the present invention;

[0023] Figure 6 is a schematic cross-sectional planar structure of the piston cylinder of the present invention;

[0024] Figure 7 is a partially enlarged structural diagram of point C in Figure 6 of the present invention;

[0025] Figure 8 is a schematic diagram of a partial cross-sectional structure of the heat-resistant part of the present invention.

[0026] In the picture:

[0027] 1. Distillation tower body;

[0028] 2. Heat shield; 21. Temperature sensor; 22. L-shaped support plate; 23. Electric cylinder; 24. Gear plate; 25. Bellows; 26. Air pipe; 27. One-way valve; 28. Spur gear; 29. ​​Sleeve rod; 230. Piston plate rod; 231. Piston cylinder; 232. Bending pipe; 233. Air tank; 234. T-slot; 235. T-plug; 236. Spring; 237. L-shaped tube; 238. Air cylinder; 239. Wind turbine shaft. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] As shown in Figures 1 to 8, the present invention provides a distillation apparatus for recovering methyl methacrylate, comprising a distillation column body 1, a heat protection section 2 in the distillation column body 1, and a temperature sensor 21 fixedly connected to the inner wall of the top of the distillation column body 1 for real-time monitoring of the temperature inside the distillation column body 1. Four L-shaped support plates 22 are also fixedly connected in a circumferential manner to the inner wall of the distillation column body 1. An electric cylinder 23 is fixedly connected to the outer wall of one end of each L-shaped support plate 22. The other end of the electric cylinder 23 is equipped with a compression structure that can disperse a small amount of high-temperature gas inside the distillation column body 1. Cold gas tanks 233 are fixedly connected to the outer walls of both ends of the distillation column body 1. Each of the two cold gas tanks 233 has a meshing piston structure at one end. The compression structure is moved by the electric cylinder 23, which can simultaneously draw in the cold gas from the two cold gas tanks 233, mixing it with the high-temperature hot gas inside the distillation column body 1 to cool its interior.

[0031] Using the above scheme: When heating and distilling methyl methacrylate in the distillation column body 1, once the hot gas in the distillation column body 1 accumulates and heats up, or when a local high temperature is generated in the distillation column body 1, it will be sensed by the temperature sensor 21 installed in the distillation column body 1. The temperature sensor 21 monitors the ambient temperature in real time and feeds the data back to the central control system in the prior art. After the central control system responds, it starts the electric cylinder 23 to retract based on the feedback from the temperature sensor 21 (this process is specifically the prior art).

[0032] The extrusion structure includes a toothed plate 24 fixedly connected to the other end of the electric cylinder 23. A bellows 25 is fixedly connected to the other end of the toothed plate 24. The other end of the bellows 25 is fixedly connected to an L-shaped support plate 22 located opposite to the electric cylinder 23. The outer surfaces of the electric cylinder 23 and the bellows 25 are coated with fireproof and heat-insulating paint. Gas pipes 26 are fixedly connected to both ends of the bellows 25 on the side away from the toothed plate 24. A one-way valve 27 is fixedly connected to each of the two gas pipes 26. The rod of one gas pipe 26 is fixedly connected to the inner and outer walls of one end of the distillation column body 1. The two gas pipes 26 respectively serve as a gas extraction and a gas delivery function.

[0033] The above scheme is adopted: the electric cylinder 23 installed on the L-shaped support plate 22 is activated, which retracts and drives the toothed plate 24 to move horizontally. During the horizontal movement, the toothed plate 24 will simultaneously drive the installed bellows 25 to extend, thereby generating a negative pressure suction force. This allows some high-temperature hot gas from the top of the distillation column body 1 to be drawn through a gas pipe 26. When the electric cylinder 23 is passively extended, some high-temperature hot gas drawn from the bellows 25 can be discharged from the distillation column body 1 through another gas pipe 26, thereby reducing the high-temperature gas in the distillation column body 1 and preventing the temperature from rising continuously.

[0034] Each of the two meshing piston structures includes a spur gear 28. A sleeve rod 29 is movably sleeved on one end of the spur gear 28. One end of the sleeve rod 29 is fixedly connected to the inner wall of the distillation column body 1. A piston plate rod 230 is threadedly connected to the other end of the spur gear 28. A telescopic positioning rod is fixedly connected to the rod of the piston plate rod 230. One end of the telescopic positioning rod is fixedly connected to the inner wall of the distillation column body 1. The piston plate rod 230 is specifically composed of two parts. Part of it is a rubber disc and part is a metal rod. A piston cylinder 231 is attached and slidably connected to the piston rod 230. One end of the outer wall of the piston cylinder 231 is fixedly connected to the outer wall of one of the L-shaped support plates 22. A bent pipe 232 is fixedly connected through one end of the side wall of the piston cylinder 231. A one-way valve is fixedly connected to the pipe body of the bent pipe 232. The bent pipe 232 is also connected through and attached to the L-shaped support plate 22 fixed on the bent pipe 232. The other end of the bent pipe 232 is fixedly connected through and attached to one end of the cold air tank 233.

[0035] Using the above scheme: During the retraction of the electric cylinder 23, the passively retracting toothed plate 24 will mesh with the spur gear 28 after moving a certain distance, thereby driving the spur gear 28 to rotate in a limited manner on the sleeve rod 29. The rotating spur gear 28 can drive the piston plate rod 230 to move in a guided translation with the help of the telescopic positioning rod. The piston plate rod 230 can generate a negative pressure suction force in the piston cylinder 231, and then draw the cooling gas in the cold air tank 233 through the bent pipe 232. The one-way valve on the bent pipe 232 is used to ensure that the cooling gas only enters and does not exit in the piston cylinder 231.

[0036] The piston cylinder 231 has multiple T-shaped grooves 234 arranged in a circumferential manner on its inner wall. Each T-shaped groove 234 has a T-shaped plug 235 that can be intermittently slidably engaged in its inner wall. Each T-shaped plug 235 has a spring 236 fixedly connected to its top outer wall. The top of each spring 236 is fixedly connected to the top inner wall of each T-shaped groove 234. Multiple L-shaped tubes 237 are fixedly connected in a circumferential manner through the piston cylinder 231. One end of each L-shaped tube 237 is fixedly connected to one end of each T-shaped groove 234. Each L-shaped tube 237 has an air cylinder 238 fixedly connected to its top. The bottom outer wall of each air cylinder 238 is fixedly connected to the outer wall of the piston cylinder 231. Each air cylinder 238 also has a wind turbine shaft 239 movably sleeved in its top inner wall.

[0037] Using the above scheme: the suction force generated by the translation of piston rod 230 can also drive T-shaped plug 235 in T-shaped groove 234 to slide within T-shaped groove 234, thereby sealing the opening of T-shaped groove 234. The translated T-shaped plug 235 also pulls on spring 236, causing it to deform. When the electric cylinder 23 extends again, it can cause piston rod 230 to push and squeeze the pre-pumped cooling gas within piston cylinder 231. As a result, the T-shaped plug 235, impacted by the cooling gas, will... The spring 236 immediately resets the T-shaped plug 235, preventing it from obstructing the L-shaped tube 237. Cooling gas is then ejected from the L-shaped tube 237, causing the impeller shaft 239 mounted on the inner wall of the top of the gas cylinder 238 to rotate. This increases airflow within the distillation column body 1 and allows for better fusion of the cooling gas and the hot gas within the distillation column body 1, facilitating rapid cooling within the distillation column body and preventing the polymerization reaction of methyl methacrylate, which would affect distillation quality.

[0038] The working principle and usage of this invention are as follows: During the heating and distillation of methyl methacrylate in the distillation column body 1, once the hot gas accumulates and heats up inside the distillation column body 1, or when a local high temperature is generated inside the distillation column body 1, it will be sensed by the temperature sensor 21 installed inside the distillation column body 1. Immediately, the electric cylinder 23 installed on the L-shaped support plate 22 will be activated, causing it to retract and thus drive the toothed plate 24 to move horizontally. During the horizontal movement, the toothed plate 24 will simultaneously drive the installed bellows 25 to extend, thereby generating a negative pressure suction force, which will then draw some of the high-temperature hot gas from the top of the distillation column body 1 through a gas pipe 26. When the electric cylinder 23 passively extends, it can exhaust some of the high-temperature hot gas drawn from the bellows 25 through another gas pipe 26 to the distillation column body 1, thereby reducing the high-temperature gas in the distillation column body 1 and preventing the temperature from rising continuously. During the retraction of the electric cylinder 23, the passively retracting toothed plate 24 will mesh with the spur gear 28 after moving a certain distance, thereby driving the spur gear 28 to rotate in a limited manner on the sleeve rod 29. The rotating spur gear 28 can drive the piston plate rod 230 to move in a guided translation with the help of the telescopic positioning rod. The piston plate rod 230, which moves in this way, can move in the piston cylinder 231. A negative pressure suction force is generated, which draws the cooling gas from the cold air tank 233 through the bend tube 232. Simultaneously, the suction force generated by the translational movement of the piston rod 230 also drives the T-shaped plug 235 within the T-shaped groove 234, causing it to slide and seal the opening of the T-shaped groove 234. The translated T-shaped plug 235 also pulls on the spring 236, causing it to deform. When the electric cylinder 23 extends further, the piston rod 230 pushes and squeezes the previously drawn-in cooling gas within the piston cylinder 231. The T-shaped plug 235, impacted by the cooling gas, immediately passes through the spring 236 and enters... When the T-shaped plug 235 is reset, it can no longer block the L-shaped tube 237. Immediately, the cooling gas can be injected from the L-shaped tube 237, which in turn drives the impeller shaft 239 installed in the inner wall of the top of the gas cylinder 238 to rotate, increasing the airflow in the distillation column body 1. At the same time, it allows the cooling gas and the hot gas in the distillation column body 1 to mix better. By removing the high-temperature gas from the distillation column body 1, the temperature can be prevented from rising continuously, and the cooling gas can be mixed with other high-temperature gases, which is conducive to the rapid cooling in the distillation column body 1 and prevents the polymerization reaction of methyl methacrylate, which would affect the distillation quality.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A methyl methacrylate recovery distillation apparatus comprising a distillation column body (1), characterized by: The rectifying tower body (1) is provided with a heatproof part (2), the heatproof part (2) includes a temperature sensor (21) fixedly connected to the inner wall of the top end of the rectifying tower body (1), for real-time monitoring of the temperature in the rectifying tower body (1), and four L-shaped supporting plates (22) are fixedly connected around the inner wall of the rectifying tower body (1), one end of one of the L-shaped supporting plates (22) is fixedly connected to the outer wall of the electric cylinder (23), the other end of the electric cylinder (23) is provided with an extrusion structure capable of dispersing a small amount of high-temperature gas in the rectifying tower body (1), and the outer wall of two ends of the rectifying tower body (1) is fixedly connected with a cold gas tank (233), one end of the two cold gas tanks (233) is provided with a meshing piston structure, which is driven to move by the extrusion structure of the electric cylinder (23), and can contact and drive the two meshing piston structures to suck the cold gas in the two cold gas tanks (233) at the same time, and in turn mix with the high-temperature gas in the rectifying tower body (1) to cool the inside.

2. The recovered methyl methacrylate rectification apparatus according to claim 1, characterized by: The extrusion structure includes a tooth plate (24) fixedly connected to the other end of the electric cylinder (23), and the other end of the tooth plate (24) is fixedly connected with a bellows (25), the other end of the bellows (25) is fixedly connected with one of the L-shaped supporting plates (22) in opposite orientation with the electric cylinder (23), and the outer wall surfaces of the electric cylinder (23) and the bellows (25) are coated with fireproof and heat insulation paint.

3. The recovered methyl methacrylate rectification apparatus according to claim 2, characterized by: The outer wall surfaces of the electric cylinder (23) and the bellows (25) are coated with fireproof and heat insulation paint.

4. The recovered methyl methacrylate rectification apparatus according to claim 3, characterized by: The outer wall surfaces of the electric cylinder (23) and the bellows (25) are coated with fireproof and heat insulation paint.

5. The recovered methyl methacrylate rectification apparatus according to claim 4, characterized by: The outer wall surfaces of the electric cylinder (23) and the bellows (25) are coated with fireproof and heat insulation paint. The outer wall surfaces of the electric cylinder (23) and the bellows (25) are coated with fireproof and heat insulation paint. The outer wall surfaces of the electric cylinder (23) and the bellows (25) are coated with fireproof and heat insulation paint. The outer wall surfaces of the electric cylinder (23) and the bellows (25) are coated with fireproof and heat insulation paint.

6. The recovered methyl methacrylate rectification apparatus according to claim 5, characterized by: One end side wall of the piston cylinder (231) is fixedly connected with a bent pipe (232) penetrating through, the pipe body of the bent pipe (232) is fixedly connected with a one-way valve two, the bent pipe (232) is specifically and the L-shaped supporting plate (22) plate body fixed on the bent pipe (232) are penetratingly connected, the other end of the bent pipe (232) and one end of the cold gas tank (233) are penetratingly fixedly connected.

7. The recovered methyl methacrylate rectification apparatus according to claim 6, characterized by: The inner wall of the piston cylinder (231) is surrounded by a plurality of T-shaped grooves (234), and the inner wall of each T-shaped groove (234) can be intermittently slidably connected with a T-shaped plug (235).

8. The recovered methyl methacrylate rectification apparatus according to claim 7, characterized by: The top end outer wall of each T-shaped plug (235) is fixedly connected with a spring (236), and the top end of each spring (236) is fixedly connected with the top end inner wall of each T-shaped groove (234).

9. The recovered methyl methacrylate rectification apparatus according to claim 8, characterized by: The piston cylinder (231) is surrounded by a plurality of L-shaped pipes (237) penetratingly fixedly connected, one end of each L-shaped pipe (237) is respectively and one end of each T-shaped groove (234) is corresponding penetratingly fixed.

10. The recovered methyl methacrylate rectification apparatus according to claim 9, characterized by: The top end of each L-shaped pipe (237) is penetratingly fixedly connected with a gas cylinder (238), the bottom end outer wall of each gas cylinder (238) is fixedly connected with the outer wall of the piston cylinder (231), and the top end inner wall of each gas cylinder (238) is movably sleeved with a wind wheel shaft (239).