Tetramethylpiperidone continuous tubular fixed bed reactor
By designing a tetramethylpiperidone continuous tubular fixed-bed reactor with a telescopic cylinder driving the lifting and rotation of the pallet, the problem of tedious catalyst particle replacement was solved, enabling rapid and complete removal of catalyst particles and improving replacement efficiency.
Patent Information
- Application Number
- CN202520239717.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-15
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2035-02-15
AI Technical Summary
In existing fixed-bed reactors, replacing catalyst particles is time-consuming, and deactivated catalyst is not easy to remove quickly, making them particularly unsuitable for catalysts that are prone to deactivation.
A continuous tubular fixed-bed reactor for tetramethylpiperidone was designed, which uses a telescopic cylinder to drive the pallet to lift and rotate, and combined with the inclined product and catalyst outlet pipes, to achieve rapid discharge of catalyst particles.
This enables rapid and thorough replacement of catalyst particles, improving replacement efficiency.
Smart Images
Figure CN223959619U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a tetramethylpiperidone continuous tubular fixed-bed reactor, belonging to the technical field of fixed-bed reactors. Background Technology
[0002] Tetramethylpiperidinone, also known as triacetone amine, has the chemical name 2,2,6,6-tetramethylpiperidinone. Triacetone amine is an important synthetic intermediate. A tubular fixed-bed reactor is required for the synthesis of tetramethylpiperidinone.
[0003] The tube is filled with catalyst, and the shell side is vented with a heat transfer medium. Tubular reactors have good heat transfer performance, making it easy to control the catalyst bed temperature. Furthermore, due to the small tube diameter, the flow of fluid in the catalyst bed can be considered as ideal displacement flow, resulting in a fast reaction rate and high selectivity.
[0004] However, existing fixed-bed reactors generally suffer from the problem of time-consuming catalyst particle replacement, and the deactivated catalyst is not easy to remove quickly, making them unsuitable for catalysts that are easily deactivated.
[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content
[0006] This invention addresses the shortcomings of the prior art by providing a tetramethylpiperidone continuous tubular fixed-bed reactor, which can quickly and completely remove deactivated catalyst particles from the tubes, thereby improving the catalyst particle replacement efficiency.
[0007] To solve the above technical problems, the present invention adopts the following technical solution:
[0008] A tetramethylpiperidone continuous tubular fixed-bed reactor includes a reaction shell, a feed end pipe at the top of the reaction shell, a discharge end pipe at the bottom of the reaction shell, and a vertically arranged column of tubes installed in the middle of the inner cavity of the reaction shell, the column of tubes being filled with granular solid catalyst; the bottom end of the discharge end pipe is sealed, and product outlet pipes and catalyst outlet pipes connected to both sides of the discharge end pipe are provided;
[0009] A circular support plate is installed directly below the tube column. The support plate is raised and lowered by a telescopic cylinder. The bottom of the support plate is rotatably connected to the head of the telescopic rod of the telescopic cylinder.
[0010] A turntable is located directly below the tray, and the turntable has a groove for embedding the tray; a hollow rotating shaft is fixedly connected to the bottom of the turntable and is arranged coaxially with it.
[0011] In one optimized configuration, both the product outlet pipe and the catalyst outlet pipe are inclined.
[0012] Furthermore, the included angle between the product outlet pipe and the catalyst outlet pipe and the discharge end pipe is 60°.
[0013] Furthermore, the top of the tube is fixedly connected to the upper orifice plate, and the bottom of the tube is fixedly connected to the lower orifice plate. Both the upper and lower orifice plates are fixed to the inner wall of the reaction shell.
[0014] Furthermore, the tray is evenly distributed with mesh holes, the pore size of which is smaller than the particle size of the catalyst particles.
[0015] Furthermore, the telescopic cylinder is vertically arranged, and the cylinder body is fixedly connected to the bottom of the reaction shell.
[0016] Furthermore, the hollow rotating shaft is sleeved on the telescopic rod of the telescopic cylinder, and the hollow rotating shaft passes through the bearing seat.
[0017] Furthermore, the bearing housing is fixedly connected to the sealing end at the bottom of the discharge pipe, and the bearing housing provides rotational support for the hollow rotating shaft.
[0018] Furthermore, a pulley is fitted on the outer side of the lower end of the hollow shaft, and the pulley is connected to the motor via a belt.
[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:
[0020] When the catalyst particles in the tube are deactivated and need to be replaced, the telescopic cylinder retracts, causing the pallet to descend. During the descent of the pallet, some catalyst particles in the tube enter the discharge end pipe and are then discharged through the catalyst discharge pipe, while some catalyst particles remain on the pallet. When the pallet descends to the groove of the turntable, the motor drives the hollow shaft and the turntable to rotate, which in turn drives the pallet to rotate, causing the catalyst particles on the pallet to be thrown out and fall into the discharge end pipe, where they are discharged through the catalyst discharge pipe.
[0021] This invention enables the rapid and complete removal of deactivated catalyst particles from the tube, thereby improving the efficiency of catalyst particle replacement.
[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of this utility model;
[0024] Figure 2 This is a schematic diagram of the internal structure of this utility model;
[0025] Figure 3 yes Figure 2 A magnified view of a portion of the image.
[0026] In the figure, 1-reaction shell, 2-feed end pipe, 3-discharge end pipe, 4-tube column, 5-upper orifice plate, 6-lower orifice plate, 7-support plate, 8-telescopic cylinder, 9-turntable, 10-hollow rotating shaft, 11-bearing seat, 12-pulley, 13-product outlet pipe, 14-catalyst outlet pipe. Detailed Implementation
[0027] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.
[0028] like Figures 1-3 As shown, this utility model provides a tetramethylpiperidone continuous tubular fixed bed reactor, including a reaction shell 1, a feed end pipe 2 at the top of the reaction shell 1, and a discharge end pipe 3 at the bottom of the reaction shell 1.
[0029] The bottom end of the discharge pipe 3 is sealed. On both sides of the discharge pipe 3, there are product discharge pipes 13 and catalyst discharge pipes 14 connected to it. Both product discharge pipes 13 and catalyst discharge pipes 14 are inclined and the included angle between the product discharge pipes 13 and catalyst discharge pipes 14 and the discharge pipe 3 is 60°.
[0030] The reaction shell 1 has a vertically arranged tube 4 installed in the middle of its inner cavity. The top of the tube 4 is fixedly connected to the upper perforated plate 5, and the bottom of the tube 4 is fixedly connected to the lower perforated plate 6. Both the upper perforated plate 5 and the lower perforated plate 6 are fixedly attached to the inner wall of the reaction shell 1.
[0031] The tube 4 is filled with granular solid catalyst.
[0032] A circular support plate 7 is provided directly below the tube 4; the support plate 7 has mesh holes evenly distributed on it, the mesh hole diameter being smaller than the particle size of the catalyst particles. The support plate 7 is used to support the catalyst inside the tube 4 without affecting the normal flow of reaction products.
[0033] The pallet 7 is driven by the telescopic cylinder 8 to achieve lifting and lowering; the bottom of the pallet 7 is rotatably connected to the telescopic rod head of the telescopic cylinder 8; the telescopic cylinder 8 is vertically arranged, and the cylinder body of the telescopic cylinder 8 is fixedly connected to the bottom of the reaction shell 1.
[0034] A turntable 9 is located directly below the tray 7. The turntable 9 has a groove for embedding the tray 7 and can drive the tray 7 to rotate. A hollow rotating shaft 10 is fixedly connected to the bottom of the turntable 9 and is coaxially arranged therewith. The hollow rotating shaft 10 is sleeved on the telescopic rod of the telescopic cylinder 8 and passes through the bearing seat 11. The bearing seat 11 is fixedly connected to the sealing end at the bottom of the discharge end pipe 3 and provides rotational support for the hollow rotating shaft 10.
[0035] The hollow shaft 10 is fitted with a pulley 12 on the outer side of its lower end. The pulley 12 is connected to the motor via a belt. The motor drives the hollow shaft 10 and the turntable 9 to rotate via belt drive.
[0036] The specific working principle of this utility model:
[0037] The granular solid catalyst is packed into the tube 4. The tetramethylpiperidone feedstock enters the tube 4 from the feed end tube 2 for catalytic reaction. The reaction product passes through the tray 7 and enters the discharge end tube 3, and is finally discharged from the product outlet tube 13.
[0038] When the catalyst particles in tube 4 become deactivated and need to be replaced, the telescopic cylinder 8 retracts, causing the pallet 7 to descend. During the descent of the pallet 7, some of the catalyst particles in tube 4 enter the discharge end pipe 3 and are then discharged through the catalyst discharge pipe 14, while some catalyst particles remain on the pallet 7. When the pallet 7 descends to the groove of the turntable 9, the motor drives the hollow rotating shaft 10 and the turntable 9 to rotate, thereby causing the pallet 7 to rotate, which causes the catalyst particles on the pallet 7 to be thrown out and fall into the discharge end pipe 3, where they are discharged through the catalyst discharge pipe 14.
[0039] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.
Claims
1. A continuous tubular fixed bed reactor for tetramethylpiperidone, comprising a reactor shell (1), a feed end pipe (2) is arranged at the top of the reactor shell (1), a discharge end pipe (3) is arranged at the bottom of the reactor shell (1), a vertical column tube (4) is installed in the middle of the inner cavity of the reactor shell (1), and the column tube (4) is filled with granular solid catalyst, characterized in that: The bottom end of the discharge end pipe (3) is closed, and the two sides of the discharge end pipe (3) are provided with product discharge pipes (13) and catalyst discharge pipes (14) in communication with the discharge end pipe (3); A circular supporting plate (7) is arranged directly below the column pipe (4), the supporting plate (7) is driven to ascend and descend by a telescopic cylinder (8), and the bottom of the supporting plate (7) is rotationally connected with the head of the telescopic rod of the telescopic cylinder (8); A rotating disc (9) is arranged directly below the supporting plate (7), the rotating disc (9) is provided with a groove for embedding the supporting plate (7), and the bottom of the rotating disc (9) is fixedly connected with a hollow rotating shaft (10) coaxially arranged with the rotating disc (9).
2. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 1, characterized in that: The product discharge pipes (13) and the catalyst discharge pipes (14) are both arranged obliquely.
3. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 2, characterized in that: The included angle between the product discharge pipes (13) and the catalyst discharge pipes (14) and the discharge end pipe (3) is 60°.
4. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 1, characterized in that: The top of the column pipe (4) is fixedly connected with the upper hole plate (5), and the bottom of the column pipe (4) is fixedly connected with the lower hole plate (6), and the upper hole plate (5) and the lower hole plate (6) are fixedly connected to the inner wall of the reaction shell (1).
5. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 1, characterized in that: The supporting plate (7) is uniformly provided with mesh holes, and the aperture of the mesh holes is smaller than the particle size of the catalyst particles.
6. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 1, characterized in that: The telescopic cylinder (8) is vertically arranged, and the cylinder body of the telescopic cylinder (8) is fixedly connected below the reaction shell (1).
7. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 1, characterized in that: The hollow rotating shaft (10) is sleeved on the telescopic rod of the telescopic cylinder (8), and the hollow rotating shaft (10) penetrates the bearing seat (11).
8. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 7, characterized in that: The bearing seat (11) is fixedly connected with the closed end of the bottom of the discharge end pipe (3), and the bearing seat (11) rotationally supports the hollow rotating shaft (10).
9. A continuous tubular fixed bed reactor for tetramethylpiperidone according to claim 1, characterized in that: The outer side of the lower end of the hollow rotating shaft (10) is provided with a belt wheel (12), and the belt wheel (12) is connected with the motor through a belt.