A catalytic reactor for preparing methyl methacrylate from waste plastic pyrolysis gasification

Abstract

The utility model discloses a kind of waste plastics pyrolysis gasification preparation methyl methacrylate's catalytic reactor, belong to chemical industry, including catalytic reactor body, the right side of the catalytic reactor body is fixedly installed with filter by pipeline, the right end of the filter is installed with separator by pipeline, the upper end of the filter is installed with fan by pipeline, the lower end of the catalytic reactor body is fixedly installed with heater, the upper end of the catalytic reactor body is fixedly installed with motor, the output shaft of the motor is fixedly installed with stirring rod, the stirring rod is movably inserted in catalytic reactor body, the lower end of the stirring rod is fixedly installed with first stirring head;Through the cooperation of above each device, it is more delicate and uniform to stir, avoid the problem that local reaction is not sufficient or excessive reaction caused by uneven mixing, can significantly improve the production efficiency and product quality of waste plastics pyrolysis gasification preparation methyl methacrylate.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically a catalytic reactor for the pyrolysis and gasification of waste plastics to prepare methyl methacrylate. Background Technology

[0002] Traditional waste plastic treatment methods often lead to environmental pollution and fail to effectively utilize the chemical energy in waste plastics. However, through pyrolysis gasification technology, waste plastics can be converted into high-value-added chemicals, such as methyl methacrylate. This not only enables the resource utilization of waste plastics but also effectively reduces production costs, which is in line with the concept of sustainable development.

[0003] An investigation revealed that a Chinese utility model patent (publication number: CN219596585U) discloses an adiabatic reactor for producing methyl acrylate and methyl methacrylate. The reactor includes a reactor tower with an upper packing layer and a lower packing layer arranged vertically. The reactor tower has a discharge port at the bottom and a top inlet at the top. A cold material inlet is located between the upper and lower packing layers. The reactor tower is equipped with distributors connected to the top inlet and the cold material inlet, respectively. The top of the upper and lower packing layers is also equipped with packing glands.

[0004] Although the aforementioned patent can effectively control the optimal reaction temperature of the reactor through the setting of a two-stage reactor, after continuously adjusting the feed ratio of the two stages and analyzing the product quality under different feed ratios, it was found that as the feed ratio of the lower stage increases within a certain range, the method of slowly melting the raw materials and catalysts for preparing methyl methacrylate into the reactor by heating is relatively slow, resulting in low production efficiency and uneven melting, which affects the yield and purity of methyl methacrylate.

[0005] Therefore, this invention provides a catalytic reactor for the pyrolysis and gasification of waste plastics to prepare methyl methacrylate, in order to solve the above-mentioned problems. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] This invention provides a catalytic reactor for the pyrolysis and gasification of waste plastics to prepare methyl methacrylate, aiming to solve the problems mentioned in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: It includes a catalytic reactor body, a filter fixedly installed on the right side of the catalytic reactor body via a pipe, a separator installed on the right end of the filter via a pipe, a blower installed on the upper end of the filter via a pipe, a heater fixedly installed on the lower end of the catalytic reactor body, a motor fixedly installed on the upper end of the catalytic reactor body, a stirring rod fixedly installed on the output shaft of the motor, the stirring rod being movably inserted into the catalytic reactor body, a first stirring head fixedly installed on the lower end of the stirring rod, and a multi-blade stirring assembly provided on the lower end of the stirring rod and the first stirring head.

[0010] As a preferred technical solution of this application, the multi-blade stirring assembly includes a first toothed ring, which is fixedly installed on the outer wall of the lower end of the stirring rod. A fixing frame is fixedly installed inside the catalytic reactor body. Multiple sets of first drive shafts are rotatably installed inside the fixing frame. First gears are fixedly installed at both the upper and lower ends of the multiple sets of first drive shafts. The first gears at the upper ends of the multiple sets of first drive shafts mesh with the first toothed ring. A cam toothed ring is rotatably installed inside the upper end of the first stirring head. Multiple sets of second gears are rotatably installed inside the first stirring head. The multiple sets of second gears mesh with the teeth on the lower side of the cam toothed ring. A second drive shaft is fixedly installed on each of the multiple sets of second gears. A first bevel gear is rotatably installed inside each of the multiple sets of blades of the first stirring head. A second bevel gear is rotatably installed inside each of the multiple sets of blades of the first stirring head. The multiple sets of first bevel gears mesh with the multiple sets of second bevel gears. A second stirring head is fixedly installed on each of the multiple sets of second bevel gears.

[0011] As a preferred technical solution of this application, the blades on the multiple sets of first stirring heads and the multiple sets of second stirring heads are arranged in a triangular orientation, and the multiple sets of second stirring heads are located below the blades on the multiple sets of first stirring heads.

[0012] As a preferred technical solution of this application, a protective shell is installed on the upper end of multiple sets of the first drive shafts, and the multiple sets of the protective shells and the first gear ring are located inside the protective shells.

[0013] As a preferred technical solution of this application, the upper diameter of the convex shaft toothed ring is larger than the lower diameter, and the upper outer wall of the convex shaft toothed ring meshes with the first gears at the lower end of multiple sets of first transmission shafts.

[0014] As a preferred technical solution of this application, the diameter of the multiple sets of first gears is smaller than the upper end diameter of the camshaft gear ring, and the diameter of the multiple sets of first gears is the same as the diameter of the multiple sets of second gears.

[0015] As a preferred technical solution of this application, the first stirring head, the protective shell, and the multiple sets of second stirring heads are all made of nickel-based alloy.

[0016] (III) Beneficial Effects

[0017] The motor's output shaft drives the stirring rod and the first stirring head to rotate, rapidly mixing the pyrolysis and gasification of waste plastics with the catalyst. The rotation of the stirring rod and the first stirring head also drives the multi-blade stirring assembly to rotate synchronously, achieving thorough and uniform mixing of the pyrolysis and gasification of waste plastics with the catalyst. This improves reaction efficiency and product quality. The multi-blade stirring assembly, through a complex gear transmission structure, ensures finer and more uniform mixing, avoiding problems such as insufficient or excessive localized reactions caused by uneven mixing. This significantly improves the production efficiency and product quality of methyl methacrylate (MDMA) from the pyrolysis and gasification of waste plastics. Attached Figure Description

[0018] Figure 1 A front view schematic diagram of a catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics;

[0019] Figure 2 A front view cross-sectional schematic diagram of the catalytic reactor body in a catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics;

[0020] Figure 3 A front view cross-sectional schematic diagram of a multi-blade stirring assembly in a catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics.

[0021] Figure 4 for Figure 3 A magnified structural diagram at point A.

[0022] In the picture:

[0023] 1. Catalytic reactor body; 2. Filter; 3. Separator; 4. Blower; 5. Heater; 6. Motor; 7. Stirring rod; 8. First stirring head; 9. First gear ring; 10. Fixing frame; 11. First drive shaft; 12. First gear; 13. Protective shell; 14. Cam shaft gear ring; 15. Second gear; 16. Second drive shaft; 17. First bevel gear; 18. Second bevel gear; 19. Second stirring head. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This invention provides a catalytic reactor for the pyrolysis and gasification of waste plastics to prepare methyl methacrylate, such as... Figure 1-4 As shown, the catalytic reactor for the pyrolysis and gasification of waste plastic to produce methyl methacrylate includes a catalytic reactor body 1. A filter 2 is fixedly installed on the right side of the catalytic reactor body 1 through a pipe. A separator 3 is installed on the right end of the filter 2 through a pipe. A blower 4 is installed on the upper end of the filter 2 through a pipe. A heater 5 is fixedly installed on the lower end of the catalytic reactor body 1. A motor 6 is fixedly installed on the upper end of the catalytic reactor body 1. A stirring rod 7 is fixedly installed on the output shaft of the motor 6. The stirring rod 7 is movably inserted into the catalytic reactor body 1. A first stirring head 8 is fixedly installed on the lower end of the stirring rod 7. A multi-blade stirring assembly is provided on the lower end of the stirring rod 7 and the first stirring head 8.

[0026] First, waste plastics and catalyst are added into the catalytic reactor body 1. Then, motor 6 is started by an external power source. The output shaft of motor 6 drives stirring rod 7 and first stirring head 8 to rotate. When stirring rod 7 and first stirring head 8 rotate, they drive multi-blade stirring assembly to rotate synchronously, thereby fully mixing and uniformly stirring the waste plastics after pyrolysis and gasification with the catalyst in the catalytic reactor body 1.

[0027] The multi-blade stirring assembly includes a first toothed ring 9, which is fixedly installed on the lower outer wall of the stirring rod 7. A fixing frame 10 is fixedly installed inside the catalytic reactor body 1. Multiple sets of first drive shafts 11 are rotatably installed inside the fixing frame 10. First gears 12 are fixedly installed at both the upper and lower ends of the multiple sets of first drive shafts 11. The first gears 12 at the upper ends of the multiple sets of first drive shafts 11 mesh with the first toothed ring 9. A cam shaft toothed ring 14 is rotatably installed inside the upper end of the first stirring head 8. Multiple sets of second gears 15 are rotatably installed inside the first stirring head 8. The multiple sets of second gears 15 mesh with the teeth on the lower side of the cam shaft toothed ring 14. A second drive shaft 16 is fixedly installed on each of the multiple sets of second gears 15. A first bevel gear 17 is rotatably installed inside each of the multiple sets of blades of the first stirring head 8. A second bevel gear 18 is rotatably installed inside each of the multiple sets of blades of the first stirring head 8. The multiple sets of first bevel gears 17 mesh with the multiple sets of second bevel gears 18. A second stirring head 19 is fixedly installed on each of the multiple sets of second bevel gears 18.

[0028] When the stirring rod 7 and the first stirring head 8 rotate, the first gear ring 9 rotates accordingly, driving multiple sets of first transmission shafts 11 and the first gears 12 at both ends to rotate synchronously. This, in turn, drives the cam gear ring 14 and multiple sets of second gears 15 to rotate inside the first stirring head 8 through gear transmission. The rotation of the multiple sets of second gears 15 drives the rotation of multiple sets of second stirring heads 19 through the rotation of the second transmission shaft 16, multiple sets of first bevel gears 17 and multiple sets of second bevel gears 18, further enhancing the stirring effect and enabling the mixture to be mixed more evenly.

[0029] The blades on the multiple sets of first stirring heads 8 and the multiple sets of second stirring heads 19 are arranged in a triangular orientation, with the multiple sets of second stirring heads 19 located below the blades on the multiple sets of first stirring heads 8.

[0030] By setting the triangular orientation, the vortex generated during the stirring process becomes more complex, further improving the uniformity of the mixture. At the same time, the multiple sets of second stirring heads 19 are located below the blades of the multiple sets of first stirring heads 8, which can more effectively stir the mixture deposited at the bottom and avoid the problem of uneven mixing.

[0031] The upper ends of multiple sets of first drive shafts 11 are equipped with protective shells 13, and the multiple sets of protective shells 13 and the first gear ring 9 are located inside the protective shells 13.

[0032] The protective shell 13 is used to limit and protect the multiple sets of first drive shafts 11 and first gear rings 9, ensuring the stability and reliability of rotation. The protective shell 13 can effectively prevent the multiple sets of first drive shafts 11 and first gear rings 9 from shifting or shaking, thereby ensuring the normal operation and stirring effect of the multi-blade stirring assembly.

[0033] The upper diameter of the convex shaft gear ring 14 is larger than the lower diameter, and the upper outer wall of the convex shaft gear ring 14 meshes with the first gear 12 at the lower end of multiple sets of first transmission shafts 11.

[0034] This allows the convex shaft gear ring 14 to drive the first gear 12 at the lower end of multiple sets of first transmission shafts 11 to rotate synchronously more stably when rotating, thereby realizing the coordinated work of the entire multi-blade stirring assembly and improving stirring efficiency and uniformity.

[0035] The diameter of the multiple sets of first gears 12 is smaller than the upper diameter of the cam ring gear 14, and the diameter of the multiple sets of first gears 12 is the same as the diameter of the multiple sets of second gears 15.

[0036] The multiple sets of first gears 12 and multiple sets of second gears 15 have the same diameter, which ensures stability and consistency in the transmission process and further improves the mixing effect and production efficiency.

[0037] The first stirring head 8, the protective shell 13, and the multiple sets of second stirring heads 19 are all made of nickel-based alloy.

[0038] The first stirring head 8, the protective shell 13, and the multiple sets of second stirring heads 19 are all made of nickel-based alloy. Nickel-based alloy has good high temperature resistance and corrosion resistance, which can ensure stable operation of the multi-blade stirring assembly in a long-term high temperature and corrosive environment, extend the service life of the equipment, and improve the reliability and safety of the equipment.

[0039] Working principle: In use, the pretreated waste plastic and catalyst are first added into the catalytic reactor body 1 through the appropriate feed port. Then, the motor 6 is started by an external power source. The output shaft of the motor 6 starts to rotate, which in turn drives the stirring rod 7 and the first stirring head 8 to rotate together. Driven by the stirring rod 7 and the first stirring head 8, when the stirring rod 7 and the first stirring head 8 rotate, the first gear ring 9 is driven to rotate accordingly, which drives multiple sets of first transmission shafts 11 and the first gears 12 at the upper and lower ends to rotate synchronously. This further drives the cam gear ring 14 and multiple sets of second gears 15 to rotate in the first stirring head 8. The rotation of the multiple sets of second gears 15, in turn, drives the rotation of multiple sets of second stirring heads 19 through the rotation of the second transmission shaft 16, multiple sets of first bevel gears 17 and multiple sets of second bevel gears 18, thereby further enhancing the stirring effect and making the mixture more uniform.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A catalytic reactor for the pyrolysis and gasification of waste plastics to produce methyl methacrylate, comprising a catalytic reactor body (1), characterized in that: A filter (2) is fixedly installed on the right side of the catalytic reactor body (1) via a pipe. A separator (3) is installed on the right end of the filter (2) via a pipe. A blower (4) is installed on the upper end of the filter (2) via a pipe. A heater (5) is fixedly installed on the lower end of the catalytic reactor body (1). A motor (6) is fixedly installed on the upper end of the catalytic reactor body (1). A stirring rod (7) is fixedly installed on the output shaft of the motor (6). The stirring rod (7) is movably inserted into the catalytic reactor body (1). A first stirring head (8) is fixedly installed on the lower end of the stirring rod (7). A multi-blade stirring assembly is provided on the lower end of the stirring rod (7) and the first stirring head (8).

2. The catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics according to claim 1, characterized in that: The multi-blade stirring assembly includes a first toothed ring (9), which is fixedly installed on the lower outer wall of the stirring rod (7). A fixing frame (10) is fixedly installed inside the catalytic reactor body (1). Multiple sets of first drive shafts (11) are rotatably installed inside the fixing frame (10). First gears (12) are fixedly installed at both ends of the multiple sets of first drive shafts (11). The first gears (12) at the upper ends of the multiple sets of first drive shafts (11) mesh with the first toothed ring (9). A convex shaft toothed ring (14) is rotatably installed inside the upper end of the first stirring head (8). Multiple sets of second gears (15) are rotatably mounted inside the first stirring head (8). The multiple sets of second gears (15) mesh with the teeth on the lower side of the cam ring (14). A second transmission shaft (16) is fixedly mounted on each of the multiple sets of second gears (15). A first bevel gear (17) is rotatably mounted inside each of the multiple sets of blades of the first stirring head (8). A second bevel gear (18) is rotatably mounted inside each of the multiple sets of blades of the first stirring head (8). The multiple sets of first bevel gears (17) mesh with the multiple sets of second bevel gears (18). A second stirring head (19) is fixedly mounted on each of the multiple sets of second bevel gears (18).

3. The catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics according to claim 1, characterized in that: The blades on the multiple sets of first stirring heads (8) and the multiple sets of second stirring heads (19) are arranged in a triangular orientation, with the multiple sets of second stirring heads (19) located below the blades on the multiple sets of first stirring heads (8).

4. The catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics according to claim 2, characterized in that: The upper ends of multiple sets of the first drive shafts (11) are equipped with protective shells (13), and the multiple sets of protective shells (13) and the first gear ring (9) are located inside the protective shells (13).

5. The catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics according to claim 2, characterized in that: The upper diameter of the convex shaft toothed ring (14) is larger than the lower diameter, and the upper outer wall of the convex shaft toothed ring (14) meshes with the first gear (12) at the lower end of multiple sets of first transmission shafts (11).

6. The catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics according to claim 2, characterized in that: The diameter of the multiple sets of first gears (12) is smaller than the upper diameter of the cam ring gear (14), and the diameter of the multiple sets of first gears (12) is the same as the diameter of the multiple sets of second gears (15).

7. The catalytic reactor for the preparation of methyl methacrylate by pyrolysis and gasification of waste plastics according to claim 2, characterized in that: The first stirring head (8), the protective shell (13), and the multiple sets of second stirring heads (19) are all made of nickel-based alloy.

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