Reactor and method for selective hydrogenation of phenylacetylene in cracking C8 fraction

Abstract

The invention relates to the technical field of hydrogenation reactors, and provides a selective hydrogenation reactor for phenylacetylene in a cracking C8 fraction, comprising a reaction tank, a protective box fixedly connected to the top of the reaction tank, a liquid inlet box fixedly connected to the top of the reaction tank, a catalyst support plate arranged inside the reaction tank, a movable stirring mechanism arranged inside the reaction tank, an auxiliary mounting mechanism arranged inside the liquid inlet box, a movable filtering mechanism arranged inside the liquid inlet box, and an auxiliary regulating mechanism arranged inside the liquid inlet box. During use, a first motor works to facilitate full rotation of a stirring blade inside the reaction tank, cooperates with a third bevel gear to facilitate improving the stirring and mixing reaction efficiency, rotates a worm to facilitate clamping and limiting, works a second motor to facilitate an activated carbon filter plate always fitting an outer surface of a cam to perform up and down reciprocating motion, and works a third motor to facilitate adjusting the opening and closing degree of a guide plate.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogenation reactors, and in particular to a reactor and a method for selective hydrogenation of phenylacetylene in a cracked C8 fraction. Background Art

[0002] Cracking C8 refers to a mixture of aromatic hydrocarbons containing eight carbon atoms, also known as C8 aromatics. This mixture is mainly composed of o-xylene, p-xylene, m-xylene and ethylbenzene, and sometimes also contains styrene. These compounds appear as colorless, transparent, and aromatic liquids at room temperature and are important organic chemical raw materials. In particular, p-xylene and o-xylene have a wide range of industrial applications and often require the use of hydrogenation reactors in the cracking C8 process.

[0003] In the prior art, in the hydrogenation reactor used in the cracking C8 processing process, in actual use, the top hydrogenation pipeline structure of the structure is mostly connected by threaded connection. Such connection method is not only time-consuming and laborious to install or disassemble, but also prone to thread wear after long-term use, which can easily affect the stability and tightness of the structural docking. In addition, during the reaction process, only a stirring rack is used for mixing, which has a low mixing reaction efficiency and is prone to unevenness. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] Therefore, the object of the present invention is to provide a reactor and method for selective hydrogenation of phenylacetylene in cracked C8 fraction, which are used to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A reactor for selective hydrogenation of phenylacetylene in cracking C8 fraction, comprising a reaction tank, a protective box fixedly connected to the top of the reaction tank, a liquid inlet box fixedly connected to the top of the reaction tank, a catalyst support plate arranged inside the reaction tank, a movable stirring mechanism arranged inside the reaction tank, an auxiliary installation mechanism arranged inside the liquid inlet box, a movable filtering mechanism arranged inside the liquid inlet box, and an auxiliary regulating mechanism arranged inside the liquid inlet box;

[0007] The movable stirring mechanism comprises a movable component and a stirring component, and the stirring component is arranged inside the movable component.

[0008] Furthermore, the movable component includes a support base, the support base is fixedly connected to the top of the reaction tank, the top of the support base is fixedly connected to a first motor, the output end of the first motor is fixedly connected to a first bevel gear, the reaction tank is rotatably connected to a second bevel gear, the bottom of the second bevel gear is fixedly connected to a connecting plate, the connecting plate is rotatably connected to a stirring blade, the top of the stirring blade is fixedly connected to a first gear column, and the inner side of the top of the reaction tank is fixedly connected to a toothed plate, so that the stirring blade can fully rotate inside the reaction tank and rotate on its own at the same time, thereby completing the full stirring of the raw materials inside the reaction tank and avoiding the occurrence of stirring dead corners.

[0009] Furthermore, the first gear column is meshed with the gear plate, the second bevel gear is meshed with the first bevel gear, two stirring blades are provided, and the two stirring blades are symmetrically distributed with the front center line of the connecting plate as the symmetry axis, so as to facilitate a more stable stirring process.

[0010] Furthermore, the stirring assembly includes a stirring frame, the stirring frame is rotatably connected to the inside of the second bevel gear, the outside of the stirring frame is fixedly connected to the third bevel gear, the outside of the stirring frame is fixedly connected to a connecting box, the inside of the connecting box is fixedly connected to a first spring, the first spring is fixedly connected to a slide plate at one end away from the connecting box, and the slide plate is fixedly connected to a scraper at one end away from the connecting box, so as to facilitate the reverse rotation of the stirring frame and the stirring blade to improve the stirring and mixing reaction efficiency while keeping the scraper always in contact with the inside of the reaction tank for cleaning to avoid residue.

[0011] Furthermore, grooves are provided at positions corresponding to the connection box and the slide plate, and the slide plate is slidably connected inside the groove, the scraper is in contact with the reaction tank, and the third bevel gear is meshed with the first bevel gear, so that the mixing process is more stable.

[0012] Furthermore, the auxiliary mounting mechanism includes a base, the base is fixedly connected to the top of the liquid inlet box, a cover plate is rotatably connected to the outside of the base, a connecting frame is fixedly connected to the left side of the liquid inlet box, a second gear column is rotatably connected to the inside of the connecting frame, a worm gear is fixedly connected to the outside of the second gear column, a worm is rotatably connected to the inside of the connecting frame, a clamping block is slidably connected to the inside of the base, and a liquid inlet pipe is fixedly connected to the top of the liquid inlet box, so as to clamp and limit the external liquid injection pipe during the connection process between the external liquid injection pipe and the liquid inlet pipe, so as to avoid unexpected situations such as slipping during use.

[0013] Furthermore, the worm wheel meshes with the worm, the second gear column meshes with the cover plate, grooves are provided at corresponding positions of the cover plate and the clamping block, and the clamping block contacts the cover plate and the clamping block contacts the liquid inlet pipe, so as to make the clamping process more stable.

[0014] Furthermore, the movable filtering mechanism includes a second motor, which is fixedly connected to the right side of the liquid inlet box, an output end of the second motor extends through the liquid inlet box to the inside and is fixedly connected to a connecting column, a cam is fixedly connected to the outside of the connecting column, a pressure holding box is fixedly connected to the inside of the liquid inlet box, a second spring is fixedly connected to the inside of the pressure holding box, a slider is fixedly connected to the bottom of the second spring, an activated carbon filter plate is provided at the bottom of the slider, a bolt is provided between the slider and the activated carbon filter plate, the cam is in contact with the activated carbon filter plate, grooves are provided at corresponding positions of the pressure holding box and the slider is slidably connected to the inside of the groove, so that the activated carbon filter plate always fits the outer surface of the cam and makes up and down reciprocating motion, thereby filtering the incoming liquid while avoiding blockage.

[0015] Furthermore, the auxiliary adjustment mechanism includes a connecting platform, which is fixedly connected to the front side of the liquid inlet box, and a third motor is fixedly connected to the right side of the connecting platform, and an output end of the third motor extends through the connecting platform to the inside and is fixedly connected to a two-way threaded rod, a limit rod is fixedly connected to the inside of the connecting platform, and a limit block is slidably connected to the outside of the limit rod, and a guide plate is rotatably connected to the inside of the liquid inlet box, the limit block is threadedly connected to the two-way threaded rod, the limit block is slidably connected to the connecting platform, and the limit block is slidably connected to the liquid inlet box, grooves are provided at corresponding positions of the guide plate and the limit block, and the limit block is in contact with the guide plate, which is convenient for adjusting the opening and closing degree of the guide plate, thereby satisfying the regulation of the liquid inlet amount inside the liquid inlet box.

[0016] Based on the above device, the present invention also provides a method for cracking phenylacetylene in the C8 fraction. When the device is used, the external injection pipe is first connected and installed with the liquid inlet pipe, and the staff rotates the worm, and the second gear column is rotated by the rotation of the set worm and the worm wheel, so that the cover plate rotates outside the base, so that the clamping block slides inside the base until it contacts the injection pipe connected to the liquid inlet pipe. After the installation is completed, the inside of the reaction tank is injected with liquid through the set liquid inlet pipe, and the cam moves by the operation of the set second motor and the connection column, so that the activated carbon filter plate moves, and the slider slides inside the pressure holding box in cooperation with the bolt, and the second spring is cooperated, and then according to the use The liquid inlet amount is adjusted as needed. The third motor is set to work to rotate the bidirectional threaded rod, and the limit rod is cooperated to move the limit block, so that the guide plate is rotated inside the liquid inlet box, thereby adjusting the opening and closing degree of the guide plate. When the injection and hydrogenation are completed, the first motor is set to work to rotate the first bevel gear, and the second bevel gear is cooperated to rotate the connecting plate, so that the first gear column moves, and the tooth plate is cooperated to rotate the stirring blade inside the connecting plate. The first bevel gear is rotated, and the third bevel gear is cooperated to rotate the stirring frame inside the second bevel gear, so that the connecting box is rotated, and the first spring is cooperated to move the slide plate, so that the scraper is always in contact with the inner wall of the reaction tank.

[0017] Compared with the prior art, the present invention provides a reactor and method for selective hydrogenation of phenylacetylene in cracked C8 fraction, which has the following beneficial effects:

[0018] 1. The reactor for selective hydrogenation of phenylacetylene in the cracking C8 fraction is provided with a movable stirring mechanism. During use, the first motor is operated to rotate the first bevel gear, so that the stirring blade can fully rotate inside the reaction tank and rotate on its own, so as to fully stir the raw materials inside the reaction tank and avoid the occurrence of a stirring dead angle. The first bevel gear is rotated in cooperation with the third bevel gear, so that the stirring frame and the stirring blade can rotate in the opposite direction to improve the stirring and mixing reaction efficiency, and the scraper can always be in contact with the inside of the reaction tank for cleaning to avoid the occurrence of residues.

[0019] 2. The selective hydrogenation reactor for phenylacetylene in the cracking C8 fraction is provided with an auxiliary installation mechanism. During use, the provided worm rotates in cooperation with the worm gear, so that the external injection pipe can be clamped and limited during the connection between the external injection pipe and the liquid inlet pipe, thereby avoiding accidents such as slipping during use.

[0020] 3. The selective hydrogenation reactor for phenylacetylene in the cracking C8 fraction is provided with a movable filtering mechanism. During use, the second motor is provided to cooperate with the connecting column to facilitate the activated carbon filter plate to always fit the outer surface of the cam to perform up and down reciprocating motion, thereby filtering the incoming liquid while avoiding blockage.

[0021] 4. The reactor for selective hydrogenation of phenylacetylene in the cracking C8 fraction is provided with an auxiliary regulating mechanism. During use, the third motor is operated to rotate the bidirectional threaded rod, so as to adjust the opening and closing degree of the guide plate, thereby meeting the regulation of the liquid inlet amount inside the liquid inlet box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0023] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the active component of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the stirring assembly of the present invention;

[0027] Figure 5 This is a schematic diagram of the internal structure of the stirring assembly of the present invention;

[0028] Figure 6 This is a schematic diagram of the auxiliary installation mechanism structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the auxiliary installation mechanism of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the movable filtering mechanism of the present invention;

[0031] Fig. 9 It is a schematic diagram of the internal structure of the movable filtering mechanism of the present invention;

[0032] Fig.10 This is a schematic diagram of the auxiliary adjustment mechanism structure of the present invention;

[0033] Fig.11 It is a schematic diagram of the internal structure of the auxiliary adjustment mechanism of the present invention.

[0034] In the figure: 1, reaction tank; 2, protection box; 3, liquid inlet box; 4, catalyst support plate; 5, movable stirring mechanism; 51, movable assembly; 511, support seat; 512, first motor; 513, first bevel gear; 514, second bevel gear; 515, connecting plate; 516, stirring blade; 517, first gear column; 518, tooth plate; 52, stirring assembly; 521, stirring frame; 522, third bevel gear; 523, connecting box; 524, scraper; 525, first spring; 526, slide plate; 6 , auxiliary installation mechanism; 61, base; 62, cover plate; 63, connecting frame; 64, second gear column; 65, worm wheel; 66, worm; 67, liquid inlet pipe; 68, clamping block; 7, movable filtering mechanism; 71, second motor; 72, connecting column; 73, cam; 74, holding box; 75, slider; 76, activated carbon filter plate; 77, second spring; 8, auxiliary adjustment mechanism; 81, connecting table; 82, third motor; 83, guide plate; 84, two-way threaded rod; 85, limit rod; 86, limit block. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] See also Figure 1-5The present invention provides a technical solution: a reactor for selective hydrogenation of phenylacetylene in cracking C8 fraction, comprising a reaction tank 1, a protective box 2 fixedly connected to the top of the reaction tank 1, a liquid inlet box 3 fixedly connected to the top of the reaction tank 1, a catalyst support plate 4 arranged inside the reaction tank 1, a movable stirring mechanism 5 arranged inside the reaction tank 1, an auxiliary installation mechanism 6 arranged inside the liquid inlet box 3, a movable filtering mechanism 7 arranged inside the liquid inlet box 3, and an auxiliary regulating mechanism 8 arranged inside the liquid inlet box 3;

[0038] The movable stirring mechanism 5 includes a movable component 51 and a stirring component 52 . The stirring component 52 is arranged inside the movable component 51 .

[0039] Furthermore, the movable component 51 includes a support base 511, which is fixedly connected to the top of the reaction tank 1. A first motor 512 is fixedly connected to the top of the support base 511. A first bevel gear 513 is fixedly connected to the output end of the first motor 512. A second bevel gear 514 is rotatably connected inside the reaction tank 1. A connecting plate 515 is fixedly connected to the bottom of the second bevel gear 514. A stirring blade 516 is rotatably connected inside the connecting plate 515. A first gear column 517 is fixedly connected to the top of the stirring blade 516. A tooth plate 518 is fixedly connected to the inner side of the top of the reaction tank 1, so that the stirring blade 516 can fully rotate inside the reaction tank 1 while rotating on its own, thereby fully stirring the raw materials inside the reaction tank 1 and avoiding the occurrence of stirring dead corners.

[0040] Furthermore, the first gear column 517 is meshed with the tooth plate 518, the second bevel gear 514 is meshed with the first bevel gear 513, two stirring blades 516 are provided, and the two stirring blades 516 are symmetrically distributed with the front center line of the connecting plate 515 as the symmetry axis, so as to facilitate a more stable stirring process.

[0041] Furthermore, the stirring assembly 52 includes a stirring frame 521, which is rotatably connected to the inside of the second bevel gear 514, and the outside of the stirring frame 521 is fixedly connected to the third bevel gear 522, and the outside of the stirring frame 521 is fixedly connected to the connecting box 523, and the inside of the connecting box 523 is fixedly connected to the first spring 525, and the first spring 525 is fixedly connected to a slide plate 526 at one end away from the connecting box 523, and the slide plate 526 is fixedly connected to a scraper 524 at one end away from the connecting box 523, so as to facilitate the reverse rotation of the stirring frame 521 and the stirring blade 516 to improve the stirring and mixing reaction efficiency, and at the same time, the scraper 524 is always in contact with the inside of the reaction tank 1 for cleaning to avoid residue.

[0042] Furthermore, grooves are provided at corresponding positions of the connection box 523 and the slide plate 526, and the slide plate 526 is slidably connected inside the groove, the scraper 524 is in contact with the reaction tank 1, and the third bevel gear 522 is meshed with the first bevel gear 513, so as to make the mixing process more stable.

[0043] Embodiment 2

[0044] See also Figure 6-7 In combination with the first embodiment, it is further obtained that the auxiliary installation mechanism 6 includes a base 61, the base 61 is fixedly connected to the top of the liquid inlet box 3, the base 61 is rotatably connected to the cover plate 62 on the outside, the left side of the liquid inlet box 3 is fixedly connected to a connecting frame 63, the connecting frame 63 is rotatably connected to the second gear column 64, the second gear column 64 is fixedly connected to the outside with a worm gear 65, the connecting frame 63 is rotatably connected to the inside with a worm 66, the base 61 is slidably connected to the inside with a clamping block 68, and the top of the liquid inlet box 3 is fixedly connected with a liquid inlet pipe 67, so as to facilitate the clamping and limiting of the external liquid injection pipe during the connection process between the external liquid injection pipe and the liquid inlet pipe 67, so as to avoid accidents such as slipping during use.

[0045] Furthermore, the worm wheel 65 meshes with the worm 66, the second gear column 64 meshes with the cover plate 62, grooves are provided at corresponding positions of the cover plate 62 and the clamping block 68, and the clamping block 68 contacts the cover plate 62, and the clamping block 68 contacts the liquid inlet pipe 67, so as to facilitate a more stable clamping process.

[0046] Embodiment 3

[0047] See also Figure 8-9 , and combined with Example 1 and Example 2, it is further obtained that the movable filtering mechanism 7 includes a second motor 71, the second motor 71 is fixedly connected to the right side of the liquid inlet box 3, the output end of the second motor 71 penetrates the liquid inlet box 3 and extends to the inside to be fixedly connected with a connecting column 72, the outside of the connecting column 72 is fixedly connected with a cam 73, the inside of the liquid inlet box 3 is fixedly connected with a pressure holding box 74, the inside of the pressure holding box 74 is fixedly connected with a second spring 77, the bottom of the second spring 77 is fixedly connected with a slider 75, the bottom of the slider 75 is provided with an activated carbon filter plate 76, a bolt is provided between the slider 75 and the activated carbon filter plate 76, the cam 73 is in contact with the activated carbon filter plate 76, the pressure holding box 74 and the slider 75 are provided with grooves at corresponding positions, and the slider 75 is slidably connected inside the groove, so that the activated carbon filter plate 76 always fits the outer surface of the cam 73 to make up and down reciprocating motion, thereby filtering the incoming liquid while avoiding blockage.

[0048] Embodiment 4

[0049] See also Figure 10-11, and combined with the first to third embodiments, it is further obtained that the auxiliary adjustment mechanism 8 includes a connecting platform 81, the connecting platform 81 is fixedly connected to the front of the liquid inlet box 3, the third motor 82 is fixedly connected to the right side of the connecting platform 81, the output end of the third motor 82 passes through the connecting platform 81 and extends to the inside and is fixedly connected with a two-way threaded rod 84, the connecting platform 81 is fixedly connected with a limit rod 85, the limit rod 85 is externally slidably connected with a limit block 86, the liquid inlet box 3 is rotatably connected with a guide plate 83, the limit block 86 is threadedly connected to the two-way threaded rod 84, the limit block 86 is slidably connected to the connecting platform 81, the limit block 86 is slidably connected to the liquid inlet box 3, the guide plate 83 and the limit block 86 are provided with grooves at the corresponding positions, and the limit block 86 is in contact with the guide plate 83, so as to facilitate the adjustment of the opening and closing degree of the guide plate 83, thereby satisfying the adjustment of the liquid inlet amount inside the liquid inlet box 3.

[0050] Example 5 Please refer to Figure 1-11 , and in combination with Example 1 to Example 4, a method for cracking phenylacetylene in a C8 fraction is further obtained, comprising the following steps:

[0051] S1. Preparation of catalyst

[0052] A catalyst with Al2O3-SiO2, Al2O3 or SiO2 as a carrier, Ni as an active component, and at least one metal of Group IVB of the Periodic Table, at least one metal of Group VIB of the Periodic Table and at least one alkali metal and / or alkaline earth metal as a promoter is used. Specifically, the mass content of Ni in the catalyst is 12% to 21%, the mass content of Group IVB metal is 0.6% to 8%, the mass content of Group VIB metal is 0.5% to 1.5%, and the mass content of alkali metal and / or alkaline earth metal is 5% to 10% of Ni, which can achieve high selective hydrogenation of phenylacetylene, while minimizing the loss of styrene and controlling the amount of colloid generated.

[0053] S2. Hydrogenation reaction

[0054] The C8 fraction containing phenylacetylene is contacted with the above catalyst to carry out a hydrogenation reaction. The reaction conditions include suitable reaction temperature, weight space velocity, hydrogen / phenylacetylene molar ratio and reaction pressure to optimize the hydrogenation efficiency and selectivity of phenylacetylene while minimizing the loss of styrene.

[0055] S3. Product processing

[0056] The products after the hydrogenation reaction need to be further processed using equipment such as selective hydrogenation reactors and extractive distillation towers to separate and purify the target products, as well as subsequent desulfurization treatment based on processing requirements to ensure the purity and quality of the final product.

[0057] During actual operation, when this device is used, first connect and install the external injection pipe with the liquid inlet pipe 67, and the staff rotates the worm 66, and the worm 66 is rotated by cooperating with the worm wheel 65 to rotate the second gear column 64, so that the cover plate 62 rotates outside the base 61, so that the clamping block 68 slides inside the base 61 until it contacts the injection pipe connected to the liquid inlet pipe 67. After the installation is completed, the reaction tank 1 is injected with liquid through the liquid inlet pipe 67, and the second motor 71 is operated by cooperating with the connecting column 72 to move the cam 73, so that the activated carbon filter plate 76 moves, and the slider 75 is slid inside the pressure holding box 74 by cooperating with the bolt, and the second spring 77 is cooperated to adjust the liquid inlet amount according to the use requirements, and the third motor 82 is operated by the third motor 82. The two-way threaded rod 84 is rotated, and the limit rod 85 is cooperated with to move the limit block 86, so that the guide plate 83 is rotated inside the liquid inlet box 3, so as to adjust the opening and closing degree of the guide plate 83. When the injection and hydrogenation are completed, the first motor 512 is set to work, the first bevel gear 513 is rotated, and the second bevel gear 514 is cooperated to rotate the connecting plate 515, so that the first gear column 517 moves, and the tooth plate 518 is cooperated to make the stirring blade 516 rotate inside the connecting plate 515. The first bevel gear 513 is rotated, and the third bevel gear 522 is cooperated to make the stirring frame 521 rotate inside the second bevel gear 514, so that the connecting box 523 is rotated, and the first spring 525 is cooperated to move the slide plate 526, so that the scraper 524 is always in contact with the inner wall of the reaction tank 1.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A reactor for selective hydrogenation of phenylacetylene in cracked C8 fraction, comprising a reaction tank (1), characterized in that: The top of the reaction tank (1) is fixedly connected to a protection box (2), the top of the reaction tank (1) is fixedly connected to a liquid inlet box (3), a catalyst support plate (4) is arranged inside the reaction tank (1), a movable stirring mechanism (5) is arranged inside the reaction tank (1), an auxiliary installation mechanism (6) is arranged inside the liquid inlet box (3), a movable filtering mechanism (7) is arranged inside the liquid inlet box (3), and an auxiliary adjustment mechanism (8) is arranged inside the liquid inlet box (3); The movable stirring mechanism (5) comprises a movable component (51) and a stirring component (52), wherein the stirring component (52) is arranged inside the movable component (51); The movable component (51) comprises a support base (511), the support base (511) is fixedly connected to the top of the reaction tank (1), a first motor (512) is fixedly connected to the top of the support base (511), a first bevel gear (513) is fixedly connected to the output end of the first motor (512), a second bevel gear (514) is rotatably connected inside the reaction tank (1), a connecting plate (515) is fixedly connected to the bottom of the second bevel gear (514), a stirring blade (516) is rotatably connected inside the connecting plate (515), a first gear column (517) is fixedly connected to the top of the stirring blade (516), and a toothed plate (518) is fixedly connected to the inner side of the top of the reaction tank (1); The stirring assembly (52) comprises a stirring frame (521), the stirring frame (521) being rotatably connected to the inside of the second bevel gear (514), the outside of the stirring frame (521) being fixedly connected to a third bevel gear (522), the outside of the stirring frame (521) being fixedly connected to a connecting box (523), the inside of the connecting box (523) being fixedly connected to a first spring (525), one end of the first spring (525) away from the connecting box (523) being fixedly connected to a slide plate (526), ​​and one end of the slide plate (526) away from the connecting box (523) being fixedly connected to a scraper (524); The auxiliary mounting mechanism (6) comprises a base (61), the base (61) being fixedly connected to the top of the liquid inlet box (3), the base (61) being rotatably connected to a cover plate (62) on the outside, a connecting frame (63) being fixedly connected to the left side of the liquid inlet box (3), the connecting frame (63) being rotatably connected to a second gear column (64), the second gear column (64) being fixedly connected to a worm wheel (65) on the outside, the connecting frame (63) being rotatably connected to a worm (66) on the inside, a clamping block (68) being slidably connected to the inside of the base (61), and a liquid inlet pipe (67) being fixedly connected to the top of the liquid inlet box (3); The movable filtering mechanism (7) comprises a second motor (71), the second motor (71) being fixedly connected to the right side of the liquid inlet box (3), the output end of the second motor (71) passing through the liquid inlet box (3) extending to the inside and being fixedly connected to a connecting column (72), the outside of the connecting column (72) being fixedly connected to a cam (73), the inside of the liquid inlet box (3) being fixedly connected to a pressure holding box (74), the inside of the pressure holding box (74) being fixedly connected to a second spring (77), the bottom of the second spring (77) being fixedly connected to a slider (75), the bottom of the slider (75) being provided with an activated carbon filter plate (76), a bolt being provided between the slider (75) and the activated carbon filter plate (76), the cam (73) being in contact with the activated carbon filter plate (76), a groove being provided at positions corresponding to the pressure holding box (74) and the slider (75), and the slider (75) being slidably connected inside the groove.

2. The reactor for selective hydrogenation of phenylacetylene in cracked C8 fraction according to claim 1, characterized in that: The first gear column (517) meshes with the gear plate (518), the second bevel gear (514) meshes with the first bevel gear (513), and two stirring blades (516) are provided, and the two stirring blades (516) are symmetrically distributed with the front center line of the connecting plate (515) as the symmetry axis.

3. A reactor for selective hydrogenation of phenylacetylene in cracked C8 fraction according to claim 2, characterized in that: The connection box (523) and the slide plate (526) are provided with grooves at positions corresponding to each other, and the slide plate (526) is slidably connected inside the groove, the scraper (524) is in contact with the reaction tank (1), and the third bevel gear (522) is meshed with the first bevel gear (513).

4. The reactor for selective hydrogenation of phenylacetylene in cracked C8 fraction according to claim 3, characterized in that: The worm wheel (65) meshes with the worm (66), the second gear column (64) meshes with the cover plate (62), grooves are provided at corresponding positions of the cover plate (62) and the clamping block (68), the clamping block (68) is in contact with the cover plate (62), and the clamping block (68) is in contact with the liquid inlet pipe (67).

5. The reactor for selective hydrogenation of phenylacetylene in cracked C8 fraction according to claim 1, characterized in that: The auxiliary adjustment mechanism (8) comprises a connecting platform (81), the connecting platform (81) being fixedly connected to the front of the liquid inlet box (3), a third motor (82) being fixedly connected to the right side of the connecting platform (81), an output end of the third motor (82) passing through the connecting platform (81) extending to the inside and being fixedly connected to a bidirectional threaded rod (84), a limit rod (85) being fixedly connected to the inside of the connecting platform (81), a limit block (86) being slidably connected to the outside of the limit rod (85), a guide plate (83) being rotatably connected to the inside of the liquid inlet box (3), the limit block (86) being threadedly connected to the bidirectional threaded rod (84), the limit block (86) being slidably connected to the connecting platform (81), the limit block (86) being slidably connected to the liquid inlet box (3), grooves being provided at corresponding positions of the guide plate (83) and the limit block (86), and the limit block (86) being in contact with the guide plate (83).

6. A method for cracking phenylacetylene in a C8 fraction, the method being based on the reactor for selective hydrogenation of phenylacetylene in a C8 fraction according to claim 5, characterized in that: When the device is used, the external injection pipe is first connected and installed with the liquid inlet pipe (67), and then the worm (66) is rotated. The worm (66) is rotated to cooperate with the worm wheel (65) to rotate the second gear column (64), so that the cover plate (62) is rotated outside the base (61), so that the clamping block (68) slides inside the base (61) until it contacts the injection pipe connected to the liquid inlet pipe (67). After the installation is completed, the reaction tank (1) is injected with liquid through the liquid inlet pipe (67). The second motor (71) is operated to cooperate with the connecting column (72) to move the cam (73), so that the activated carbon filter plate (76) moves. The slider (75) is slid inside the pressure holding box (74) by the bolt, and the second spring (77) is cooperated to adjust the liquid inlet amount according to the use demand. The third motor (82) is operated to make the bidirectional threaded rod ( The first bevel gear (513) is rotated by the first motor (512) to cooperate with the second bevel gear (514) to rotate the connecting plate (515), thereby causing the first gear column (517) to move, and the tooth plate (518) to rotate the stirring blade (516) inside the connecting plate (515). The first bevel gear (513) is rotated by the first motor (512) to cooperate with the third bevel gear (522) to rotate the stirring frame (521) inside the second bevel gear (514), thereby causing the connecting box (523) to rotate, and the first spring (525) is cooperated to move the slide plate (526), ​​thereby causing the scraper (524) to always fit the inner wall of the reaction tank (1).

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