Reactor for preparing ester hydrogenation catalyst and structural optimization thereof

Abstract

The reactor comprises a shell, a feeding opening is fixedly formed in the top surface of the shell, a discharging opening is fixedly connected to the bottom of the shell, a homogenizing mechanism is fixedly arranged in the shell, and a mixing mechanism is fixedly mounted at the axis of the shell; the mixing mechanism is connected with two transmission mechanisms, the two transmission mechanisms are fixedly connected with the shell, the inner wall of the shell is fixedly connected with two supporting mechanisms, the mixing mechanism is arranged, and the mixing mechanism comprises a first stirring paddle, a second stirring paddle and a third stirring paddle, so that the device has three-layer stirring; through the arrangement of multi-stage stirring, catalyst raw materials can be fully mixed together, meanwhile, the raw materials can be continuously scattered and mixed through multi-stage stirring, and the structure of the raw materials is damaged by shearing force of three-layer stirring, so that the agglomeration phenomenon of crystal grains is reduced, and the problem that an existing mixer is prone to being blocked is solved.

Description

Technical Field

[0001] The present application relates to a reactor for preparing an ester hydrogenation catalyst and its structural optimization, belonging to the field of reactor devices. Background Art

[0002] In the preparation process of ester hydrogenation catalyst, co-precipitation is a common method. The preparation process is simple and efficient. However, the single mechanical stirring technology for mixing operation often cannot achieve uniform mixing of reactants in actual operation, resulting in differences in reactant concentrations in different regions of the reaction system, and precipitation reactions are difficult to proceed evenly. The emergence of microchannel mixers solves this problem. However, the internal channels of microchannel mixers are mostly complex and narrow. In the catalyst preparation process, due to the different concentrations and viscosities of different materials, when entering the microchannel mixer for reaction, the materials cannot flow smoothly, and the grains are easy to stick to each other and gradually aggregate, which eventually leads to more serious blockage inside the reactor, making the entire preparation process difficult. This will inevitably seriously affect the preparation efficiency of the catalyst, greatly reducing the production progress. At the same time, product quality is difficult to guarantee, because the uneven preparation process will lead to uneven distribution of active sites of the catalyst, which will in turn affect its catalytic performance, and ultimately make the product unable to meet the expected quality standards. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a reactor for preparing ester hydrogenation catalyst and its structural optimization to solve the above problems.

[0004] According to one aspect of the present application, a reactor for preparing ester hydrogenation catalyst is provided, comprising a shell, a top surface of the shell is fixedly provided with a feed port, a bottom of the shell is fixedly connected with a discharge port, a uniform mechanism is fixedly provided inside the shell, a mixing mechanism is fixedly installed at the axis of the shell, the mixing mechanism is connected to two transmission mechanisms, both of which are fixedly connected to the shell, two supporting mechanisms are fixedly connected to the inner wall of the shell, both of which are rotatably connected to the mixing mechanism, three layers of reverse flow channels are fixedly connected to the outer wall of the shell, the uniform mechanism comprises a first dispersion plate, four impact plates and a second dispersion plate, the mixing mechanism comprises a driving motor, the transmission mechanism comprises an active bevel gear and a fixed rod, and the supporting mechanism comprises four support rods.

[0005] According to another aspect of the present application, a structural optimization of a reactor for preparing ester hydrogenation catalyst is also provided, wherein a driving bevel gear is meshed and clamped with a first transmission bevel gear and a second transmission bevel gear, and the first transmission bevel gear and the second transmission bevel gear are meshed and clamped with a driven bevel gear on a side away from the driving bevel gear, and the first transmission bevel gear and the second transmission bevel gear are rotatably connected to a fixed rod at one end opposite to the second transmission bevel gear, and the two fixed rods are fixedly connected to the inner wall of the outer shell at one end away from the first transmission bevel gear and the second transmission bevel gear.

[0006] Optionally, the output end of the driving motor is fixedly connected to the first stirring shaft, the end of the first stirring shaft away from the driving motor is fixedly connected to the transmission mechanism, the first stirring shaft is fixedly connected to the driving bevel gear included in the transmission mechanism, and the middle section of the first stirring shaft is fixedly connected to the first stirring paddle.

[0007] Optionally, one end of the transmission mechanism away from the first stirring shaft is fixedly connected to the second stirring shaft, the driven bevel gear included in the transmission mechanism is fixedly connected to the second stirring shaft, the middle section of the second stirring shaft is fixedly connected to the second stirring paddle, the end of the second stirring shaft away from the driven bevel gear is fixedly connected to the driving bevel gear of another transmission mechanism, and the blades of the second stirring paddle have an opposite bending direction to the blades of the first stirring paddle.

[0008] Optionally, a third stirring shaft is fixedly connected to one end of the transmission mechanism away from the second stirring shaft, the third stirring shaft is fixedly connected to the driven bevel gear of the transmission mechanism, a third stirring paddle is fixedly connected to the middle section of the third stirring shaft, and a plurality of through holes are opened on the blade surface of the third stirring paddle.

[0009] Optionally, the four support rods included in the two support mechanisms are all fixedly connected with a connecting sleeve, wherein the connecting sleeve of one support mechanism is rotatably sleeved with the second stirring shaft, and the connecting sleeve of the other support mechanism is rotatably sleeved with the third stirring shaft.

[0010] Optionally, a plurality of through holes are provided on the surface of the first dispersion plate, a circular groove is provided at the axis center of the first dispersion plate, the first dispersion plate is fixedly connected to the inner wall of the outer shell, the first dispersion plate is arranged below the first stirring paddle, and the first stirring shaft is sleeved on the inner side of the circular groove, four impact plates are distributed and fixedly connected to the inner wall, the four impact plates are all arranged below the transmission mechanism located above and above the second stirring paddle, the second dispersion plate is fixedly connected to the inner wall of the outer shell, the second dispersion plate has the same structure as the first dispersion plate, and the second dispersion plate is located at the bottom of the transmission mechanism arranged below and above the third stirring paddle.

[0011] Optionally, the three layers of reverse flow channels are respectively located in the same plane as the first stirring paddle, the second stirring paddle and the third stirring paddle, and the reverse flow channel located in the upper layer has one end connected to the outer shell at the bottom located below the first dispersion plate, and the other end connected to the outer shell located above the first stirring paddle.

[0012] Optionally, the reverse flow channel located in the middle layer has one end of the bottom connected to the outer shell located below the second stirring paddle, and the other end connected to the outer shell located above the impact plate.

[0013] Optionally, the reverse flow channel located at the bottom layer has one end connected to the outer shell and located below the third stirring paddle, and the other end connected to the outer shell and located above the second dispersion plate. A protective shell is fixedly connected to the outer wall of the outer shell, and the protective shell wraps several reverse flow channels.

[0014] The beneficial effects of this application include:

[0015] The present application provides a reactor for preparing an ester hydrogenation catalyst and its structural optimization. By providing a mixing mechanism, the mixing mechanism includes a first stirring paddle, a second stirring paddle and a third stirring paddle, so that the present application has three-layer stirring. The multi-stage stirring setting allows the catalyst raw materials to be fully mixed together. At the same time, the multi-stage stirring can continuously break up and mix the raw materials. The shear force of the three-layer stirring destroys the structure of the raw materials, thereby reducing the agglomeration of crystal grains, and solving the problem that the existing microchannel mixer is easily blocked.

[0016] By providing two transmission mechanisms and a mixing mechanism, and by providing a second stirring paddle with reverse stirring to cooperate with the rotation of the first stirring paddle and the third stirring paddle, since the rotation direction of the second stirring paddle is opposite, the raw materials between the first stirring paddle and the second stirring paddle and between the second stirring paddle and the third stirring paddle will form a vortex structure, so that the raw materials are mixed more evenly, so that the present application has a higher mixing efficiency;

[0017] By providing the first dispersion plate, the impact plate and the second dispersion plate, the raw materials will be impacted and dispersed when passing through the first dispersion plate, the impact plate and the second dispersion plate, which can weaken the crystallization reaction and break up the aggregation area of ​​the fluid, thereby improving the uniformity of the fluid and promoting uniform mixing of the raw materials;

[0018] By providing a reverse flow channel, the raw material entering the shell, when passing through the reverse flow channel of the first layer, the reverse flow channel located at the top contacts the raw material first, and the raw material flows into the inner side of the reverse flow channel through the opening at the top of the reverse flow channel that contacts the shell, and the raw material will be sprayed out at the lower end opening of the reverse flow channel after circulating in the reverse flow channel. Due to the structure of the reverse flow channel, the sprayed raw material will impact upward, and the sprayed raw material will impact with the normally descending raw material and form a vortex, thereby increasing the shear force of the fluid and effectively reducing the aggregation of grains. The high shear stirring of the reverse flow channel and the mixing mechanism effectively reduces the aggregation of grains and prevents the blockage of the reactor, so that the present application has higher stability;

[0019] By providing two supporting mechanisms, the supporting mechanisms not only provide support for the mixing mechanism, but also the four supporting rods of the supporting mechanisms cooperate with the connecting sleeve to provide force inside the outer shell, thereby enhancing the structural stability of the outer shell, enhancing the pressure resistance of the outer shell, and avoiding the outer shell from rupture due to the rapid flow of raw materials inside, so that the present application has higher stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic side view of a reactor provided in one embodiment of the present application;

[0021] Figure 2 A schematic diagram of the side view structure of a reactor provided in one embodiment of the present application without a protective shell;

[0022] Figure 3 This is a schematic diagram of the bottom view of the structure of a reactor provided in one embodiment of the present application without the protective shell;

[0023] Figure 4 A schematic diagram of the bottom half-section structure of a reactor provided in one embodiment of the present application with the protective shell removed;

[0024] Figure 5 A schematic diagram of a half-section structure of a reactor provided in one embodiment of the present application;

[0025] Figure 6 A schematic diagram of the mixing mechanism structure of a reactor provided in one embodiment of the present application;

[0026] Figure 7 A schematic cross-sectional structure diagram of a shell and a support mechanism of a reactor provided in one embodiment of the present application;

[0027] Figure 8 A schematic diagram of the transmission mechanism structure of a reactor provided in one embodiment of the present application;

[0028] Fig. 9 This is a schematic diagram of the side structure of the reverse flow channel of the reactor provided in one embodiment of the present application.

[0029] List of parts and reference numerals:

[0030] 1. Shell; 2. Mixing mechanism; 3. Transmission mechanism; 4. Support mechanism; 5. Reverse flow channel; 101. First dispersion plate; 102. Impact plate; 103. Second dispersion plate; 104. Feed inlet; 105. Discharge outlet; 106. Protective shell; 201. Drive motor; 202. First stirring shaft; 203. First stirring paddle; 204. Second stirring shaft; 205. Second stirring paddle; 206. Third stirring shaft; 207. Third stirring paddle; 301. Active bevel gear; 302. First transmission bevel gear; 303. Second transmission bevel gear; 304. Driven bevel gear; 305. Fixed rod; 401. Support rod; 402. Connecting sleeve. DETAILED DESCRIPTION

[0031] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0032] Example:

[0033] See also Figures 1 to 9 The present invention provides a reactor for preparing an ester hydrogenation catalyst, comprising a shell 1, a feed port 104 is fixedly arranged on the top surface of the shell 1, a discharge port 105 is fixedly connected to the bottom of the shell 1, a uniform mechanism is fixedly arranged inside the shell 1, a mixing mechanism 2 is fixedly installed at the axis of the shell 1, the mixing mechanism 2 is connected to two transmission mechanisms 3, the two transmission mechanisms 3 are fixedly connected to the shell 1, two support mechanisms 4 are fixedly connected to the inner wall of the shell 1, the two support mechanisms 4 are rotatably connected to the mixing mechanism 2, a three-layer reverse flow channel 5 is fixedly connected to the outer wall of the shell 1, the uniform mechanism comprises a first dispersion plate 101, four impact plates 102 and a second dispersion plate 103, the mixing mechanism 2 comprises a driving motor 201, the transmission mechanism 3 comprises an active bevel gear 301 and two fixed rods, and the support mechanism 4 comprises four support rods 401.

[0034] An optimized design of a reactor for preparing an ester hydrogenation catalyst, wherein a driving bevel gear 301 is meshed and clamped with a first transmission bevel gear 302 and a second transmission bevel gear 303, the first transmission bevel gear 302 and the second transmission bevel gear 303 are meshed and clamped with a driven bevel gear 304 on one side away from the driving bevel gear 301, the first transmission bevel gear 302 and the second transmission bevel gear 303 are both rotatably connected to a fixed rod 305 at one end opposite to the second transmission bevel gear 303, and the ends of the two fixed rods 305 away from the first transmission bevel gear 302 and the second transmission bevel gear 303 are both fixedly connected to the inner wall of the housing 1.

[0035] The output end of the driving motor 201 is fixedly connected to the first stirring shaft 202, and the end of the first stirring shaft 202 away from the driving motor 201 is fixedly connected to the transmission mechanism 3. The first stirring shaft 202 is fixedly connected to the active bevel gear 301 included in the transmission mechanism 3, and the middle section of the first stirring shaft 202 is fixedly connected to the first stirring paddle 203.

[0036] One end of the transmission mechanism 3 away from the first stirring shaft 202 is fixedly connected to the second stirring shaft 204, the driven bevel gear 304 included in the transmission mechanism 3 is fixedly connected to the second stirring shaft 204, the middle section of the second stirring shaft 204 is fixedly connected to the second stirring paddle 205, and one end of the second stirring shaft 204 away from the driven bevel gear 304 is fixedly connected to the driving bevel gear 301 of another transmission mechanism 3, and the blades of the second stirring paddle 205 are bent in the opposite direction to the blades of the first stirring paddle 203.

[0037] The end of the transmission mechanism 3 away from the second stirring shaft 204 is fixedly connected to the third stirring shaft 206, and the third stirring shaft 206 is fixedly connected to the driven bevel gear 304 of the transmission mechanism 3. The middle section of the third stirring shaft 206 is fixedly connected to the third stirring paddle 207, and the blade surface of the third stirring paddle 207 is provided with a plurality of through holes.

[0038] The four support rods 401 included in the two support mechanisms 4 are all fixedly connected with a connecting sleeve 402 , wherein the connecting sleeve 402 of one support mechanism 4 is rotatably sleeved with the second stirring shaft 204 , and the connecting sleeve 402 of the other support mechanism 4 is rotatably sleeved with the third stirring shaft 206 .

[0039] A plurality of through holes are provided on the surface of the first dispersion plate 101, a circular groove is provided at the axis of the first dispersion plate 101, the first dispersion plate 101 is fixedly connected to the inner wall of the outer shell 1, the first dispersion plate 101 is arranged below the first stirring paddle 203, and the first stirring shaft 202 is sleeved on the inner side of the circular groove, four impact plates 102 are distributed and fixedly connected to the inner wall of 1, the four impact plates 102 are all arranged below the transmission mechanism 3 located above and above the second stirring paddle 205, the second dispersion plate 103 is fixedly connected to the inner wall of the outer shell 1, the second dispersion plate 103 has the same structure as the first dispersion plate 101, and the second dispersion plate 103 is located at the bottom of the transmission mechanism 3 located below and above the third stirring paddle 207.

[0040] The three-layer reverse flow channel 5 is located on the same plane as the first stirring paddle 203, the second stirring paddle 205 and the third stirring paddle 207 respectively. The reverse flow channel 5 located on the upper layer has one end connected to the outer shell 1 at the bottom and is located below the first dispersion plate 101, and the other end connected to the outer shell 1 and is located above the first stirring paddle 203.

[0041] The reverse flow channel 5 located in the middle layer has one end of the bottom connected to the outer shell 1 located below the second stirring paddle 205 , and the other end connected to the outer shell 1 located above the impact plate 102 .

[0042] The reverse flow channel 5 located at the bottom layer has one end connected to the outer shell 1 at the bottom below the third stirring paddle 207, and the other end connected to the outer shell 1 is located above the second dispersion plate 103. The outer wall of the outer shell 1 is fixedly connected to a protective shell 106, which wraps several reverse flow channels 5.

[0043] Working principle:

[0044] In the first step, the feed port 104 is connected to the external confluence device. The different raw materials of the catalyst are gathered through the confluence device and flow into the inner side of the shell 1 through the feed port 104. At this time, the drive motor 201 is started to drive the first stirring shaft 202 to rotate, and the first stirring shaft 202 drives the first stirring paddle 203 to rotate to stir the catalyst raw materials. The stirred raw materials are broken up of their original structure and are squeezed by the subsequently added raw materials through the first dispersion plate 101, and are further broken up by the first dispersion plate 101 to prevent the raw materials from crystallizing quickly.

[0045] In the second step, the raw materials dispersed by the first dispersion plate 101 will impact the four impact plates 102 to further disrupt the aggregation area of ​​the raw materials. The first stirring shaft 202 drives the active bevel gear 301, the first transmission bevel gear 302, the second transmission bevel gear 303 and the driven bevel gear 304 of the first transmission mechanism 3 to rotate. The active bevel gear 301 is driven by the driving force of the first stirring shaft 202 to drive the first transmission bevel gear 302 and the second transmission bevel gear 303 to rotate. After the transmission of the first transmission bevel gear 302 and the second transmission bevel gear 303, the driven bevel gear 304 finally rotates in the opposite direction based on the active bevel gear 301, and the driven bevel gear 304 drives the second stirring shaft 204 to rotate, and the second stirring shaft 204 drives the second stirring paddle 205 to rotate, and the second stirring paddle 20 5 has a rotation direction and a blade bending direction opposite to those of the first stirring paddle 203. The reverse stirring of the second stirring paddle 205 drives the raw materials to be further mixed. The second stirring shaft 204 drives the third stirring shaft 206 to rotate through another transmission mechanism 3. The rotation direction of the third stirring shaft 206 is the same as that of the first stirring shaft 202 and opposite to that of the second stirring shaft 204. The third stirring shaft 206 drives the third stirring paddle 207 to rotate. The raw materials stirred and mixed by the second stirring paddle 205 will be further dispersed through the through holes on the surface of the second dispersing plate 103, so that the raw materials are further dispersed and aggregated, and finally stirred by the third stirring paddle 207 after passing through the second dispersing plate 103. The plurality of through holes on the surface of the third stirring paddle 207 further stir and mix the raw materials under rotation.

[0046] In the third step, a second stirring paddle 205 with reverse stirring is provided. The second stirring paddle 205 cooperates with the rotation of the first stirring paddle 203 and the third stirring paddle 207. Since the rotation direction of the second stirring paddle 205 is opposite, a vortex structure will be formed between the first stirring paddle 203 and the second stirring paddle 205 and between the second stirring paddle 205 and the third stirring paddle 207, so that the mixing of the raw materials is more uniform and the mixing efficiency is higher.

[0047] In the fourth step, when the raw material enters the shell 1 and passes through the reverse flow channel 5 of the first layer, the reverse flow channel 5 at the top contacts the raw material first, and the raw material flows into the inner side of the reverse flow channel 5 through the opening at the top of the reverse flow channel 5 that contacts the shell 1. After circulating in the reverse flow channel 5, the raw material will be ejected at the lower end opening of the reverse flow channel 5. Due to the structure of the reverse flow channel 5, the ejected raw material will impact upward, and will impact with the normally descending raw material to form a vortex, thereby increasing the shear force of the fluid and effectively reducing grain aggregation.

[0048] The above description is only a partial embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the above disclosed technical content to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A reactor for preparing ester hydrogenation catalyst and its structural optimization, characterized in that: It comprises a shell, a feed port is fixedly arranged on the top surface of the shell, a discharge port is fixedly connected to the bottom of the shell, a uniform mechanism is fixedly arranged inside the shell, a mixing mechanism is fixedly installed at the axis of the shell, the mixing mechanism is connected to two transmission mechanisms, both of which are fixedly connected to the shell, two support mechanisms are fixedly connected to the inner wall of the shell, both of which are rotatably connected to the mixing mechanism, and a three-layer reverse flow channel is fixedly connected to the outer wall of the shell; Wherein, the uniform mechanism includes a first dispersion plate, four impact plates and a second dispersion plate; Wherein, the mixing mechanism includes a driving motor; Wherein, the transmission mechanism includes an active bevel gear and two fixed rods; Wherein, the supporting mechanism includes four supporting rods.

2. A structural optimization of a reactor for preparing an ester hydrogenation catalyst, characterized in that: The active bevel gear is meshed and clamped with the first transmission bevel gear and the second transmission bevel gear, and the first transmission bevel gear and the second transmission bevel gear are meshed and clamped with the driven bevel gear on one side away from the active bevel gear, and the first transmission bevel gear and the second transmission bevel gear have opposite ends that are rotatably connected to fixed rods, and the ends of the two fixed rods that are away from the first transmission bevel gear and the second transmission bevel gear are fixedly connected to the inner wall of the outer shell.

3. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 2, characterized in that: The output end of the driving motor is fixedly connected to a first stirring shaft, an end of the first stirring shaft away from the driving motor is fixedly connected to a transmission mechanism, the first stirring shaft is fixedly connected to an active bevel gear included in the transmission mechanism, and a first stirring paddle is fixedly connected to the middle section of the first stirring shaft.

4. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 3, characterized in that: The end of the transmission mechanism away from the first stirring shaft is fixedly connected to the second stirring shaft, the driven bevel gear included in the transmission mechanism is fixedly connected to the second stirring shaft, the middle section of the second stirring shaft is fixedly connected to the second stirring paddle, and the end of the second stirring shaft away from the driven bevel gear is fixedly connected to the driving bevel gear of another transmission mechanism.

5. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 4, characterized in that: One end of the transmission mechanism away from the second stirring shaft is fixedly connected to a third stirring shaft, the third stirring shaft is fixedly connected to the driven bevel gear of the transmission mechanism, and the middle section of the third stirring shaft is fixedly connected to a third stirring paddle.

6. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 5, characterized in that: The four support rods included in the two support mechanisms are all fixedly connected with a connecting sleeve, wherein the connecting sleeve of one support mechanism is rotatably connected to the second stirring shaft, and the connecting sleeve of the other support mechanism is rotatably connected to the third stirring shaft.

7. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 6, characterized in that: A through hole is provided on the surface of the first dispersion plate, a circular groove is provided at the axis of the first dispersion plate, the first dispersion plate is fixedly connected to the inner wall of the outer shell, the four impact plates are distributed and fixedly connected to the inner wall, the second dispersion plate is fixedly connected to the inner wall of the outer shell, and the second dispersion plate has the same structure as the first dispersion plate.

8. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 7, characterized in that: The three layers of reverse flow channels are respectively located in the same plane as the first stirring paddle, the second stirring paddle and the third stirring paddle. The reverse flow channel located in the upper layer has one end connected to the outer shell at the bottom located below the first dispersion plate, and the other end connected to the outer shell located above the first stirring paddle.

9. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 8, characterized in that: The reverse flow channel located in the middle layer has one end of the bottom connected to the outer shell located below the second stirring paddle, and the other end connected to the outer shell located above the impact plate.

10. The structural optimization of a reactor for preparing an ester hydrogenation catalyst according to claim 9, characterized in that: The reverse flow channel located at the bottom layer has one end connected to the outer shell at the bottom below the third stirring paddle and the other end connected to the outer shell above the second dispersion plate. A protective shell is fixedly connected to the outer wall of the outer shell.

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