Hot filtering and cooling device for preparing piperidine hexamethylenediamine light stabilizer

Abstract

The invention provides a hot filtering and cooling device for preparing a piperidine hexamethylenediamine light stabilizer, and relates to the technical field of preparation of light stabilizers. The hot filtering and cooling device for preparing the piperidine hexamethylenediamine light stabilizer comprises a fixed bed reactor, a catalyst, a second sieve plate, a telescopic spring, sleeves, a water inlet pipe, a water inlet hole, an arc-shaped top, a memory spring and a cleaning assembly, the second sieve plate is arranged at the lower end of the catalyst, the telescopic spring is arranged at the bottom of the second sieve plate, and the multiple sleeves are arranged at the lower end of the second sieve plate and correspond to sieve holes; the water inlet pipe is arranged on the sleeve, a water inlet hole is formed in the side wall, the memory spring is arranged in the sleeve to drive the arc-shaped ejector head to vertically ascend and descend, the arc-shaped ejector head can guide heat to the memory spring, and the cleaning assembly rotates for cleaning. The memory spring extends to push the arc-shaped top head to ascend to dredge sieve holes and clean uncompacted fine powder; the second sieve plate moves downwards, dense fine powder in sieve holes is rigidly ejected out through the arc-shaped ejection heads, the water inlet holes assist in pressure relief and liquid drainage, and finally it is guaranteed that the second sieve plate rapidly recovers to be normally used.

Description

Technical Field

[0001] The invention relates to the technical field of light stabilizer preparation, in particular to a hot filtering and cooling device for preparing piperidine hexamethylenediamine light stabilizer. Background Art

[0002] N, N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine (light stabilizer piperidine hexanediamine) is prepared by hydrogenation from the intermediate Schiff base formed by the condensation and dehydration of triacetoneamine and 1,6-hexanediamine. It is an important intermediate in the synthesis of hindered amine light stabilizers, such as light stabilizer 944, light stabilizer 2020, and light stabilizer 3346. The above synthesis process requires the use of a fixed-bed reactor, and the hydrogenation reaction liquid is prepared by the fixed-bed reactor.

[0003] In the actual preparation process, the sieve plate in the fixed bed reactor acts as a physical barrier to prevent catalyst particles from flowing out of the fixed bed reactor with the reactants. However, the catalyst is easily broken into fine powder under high-pressure hydrogenation conditions, and is easily deposited in the pores of the sieve plate when flowing out with the reaction liquid, clogging and affecting the normal use of the sieve plate. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a hot filtration and cooling device for preparing a piperidine hexamethylenediamine light stabilizer.

[0005] The present invention provides a heat filtration and cooling device for preparing a piperidine hexamethylenediamine light stabilizer, comprising a fixed bed reactor, a catalyst, a second sieve plate, a telescopic spring, a sleeve, a water inlet pipe, a water inlet hole, a curved head, a memory spring, and a cleaning component. The catalyst is arranged inside the fixed bed reactor, the second sieve plate can be vertically lifted and arranged at the lower end of the catalyst and has a telescopic spring at the bottom edge, a plurality of sleeves are arranged at the lower end of the second sieve plate and correspond to the sieve holes, the water inlet pipe is fixedly arranged at the upper end of the sleeve and has a water inlet hole in the side wall, the memory spring is arranged inside the sleeve, and the curved head located at the upper end of the water inlet pipe is driven to rise and fall vertically by telescopic means, the curved head can guide ambient heat to the memory spring, and the cleaning component is arranged outside the water inlet pipe and is driven to rotate and clean by the reaction liquid.

[0006] Optionally, a spiral guide plate is fixedly provided on the inner wall of the sleeve, a hollow tube is fixedly provided in the middle of the spiral guide plate, the memory spring is arranged inside the hollow tube, the bottom end of the memory spring is fixedly provided on the inner bottom surface of the hollow tube and a movable ring is fixedly provided on the upper end, the outer side of the movable ring is slidingly connected to the inner surface of the hollow tube, the middle part of the hollow tube is slidingly connected to a telescopic rod, the telescopic rod is located on the inner side of the memory spring, the inner side of the middle part of the movable ring is rotatably connected to the outer side of the telescopic rod through a bearing, and the middle part of the bottom end of the arc-shaped head is fixedly provided on the upper end part of the telescopic rod.

[0007] Optionally, when the memory spring contracts, it drives the bottom end of the arc-shaped head to seal the upper end of the water inlet pipe.

[0008] Optionally, a plurality of the water inlet holes are evenly opened along the outer peripheral side wall of the water inlet pipe, and a propeller is fixedly mounted on the outer side of the bottom end of the telescopic rod at the lower end of the arc-shaped head, and the rotation of the propeller drives the cleaning component to rotate and clean.

[0009] Optionally, the cleaning assembly includes a cleaning plate and bristles, the end of the cleaning plate is fixed on the bottom end of the arc-shaped head, the bristles are fixed on the side of the cleaning plate, and the bristles are in squeeze contact with the outside of the water inlet pipe.

[0010] Optionally, the outer side of the second sieve plate is slidably connected to the inner wall of the fixed bed reactor, guide columns are symmetrically arranged inside both sides of the second sieve plate, side plates are symmetrically fixed at both ends of the guide columns, and the side surfaces of the side plates are fixed on the inner wall of the fixed bed reactor. The second sieve plate and the guide columns are slidably connected to each other, and the outer side of the guide column is covered with a telescopic spring, and the upper and lower ends of the telescopic spring are respectively fixedly connected to the bottom end of the second sieve plate and the upper end of the side plate.

[0011] Optionally, the bottom end of the fixed bed reactor is fixedly connected to a connecting pipe, the liquid outlet end of the connecting pipe is fixedly connected to the liquid inlet end of an external crystallization kettle, the catalyst is filled in the upper end of the fixed bed reactor, and the bottom end of the catalyst is provided with a first sieve plate, and the outer side of the first sieve plate is fixed on the inner wall of the fixed bed reactor.

[0012] Optionally, the apertures of the first sieve plate and the second sieve plate gradually decrease from top to bottom, the outer sides of the multiple sleeves are fastened to each other by a support plate, the end of the support plate is fixedly connected to the inner wall of the fixed bed reactor, and the arc-shaped head matches the size of the corresponding sieve hole.

[0013] Optionally, the catalyst is filled in multiple layers.

[0014] The heat filtration and cooling device for preparing the piperidine hexamethylenediamine light stabilizer of the present invention has the following beneficial effects: 1. When the sieve holes of the second sieve plate are clogged, the arc-shaped plug has no heat transfer. The memory spring extends and pushes the arc-shaped plug upward to dredge the blockage. After dredging, the arc-shaped plug contacts the reaction liquid to transfer heat. The memory spring contracts and drives the arc-shaped plug downward to the lower end of the sieve hole, which can quickly dredge the corresponding clogged sieve hole. 2. When the fine powder accumulates densely, the memory spring pushes the arc-shaped mandrel upward and cannot push it open. As multiple sieve holes are blocked, the reaction liquid is retained and the water pressure increases, driving the second sieve plate to move downward. The blockage in the sieve holes is rigidly pushed out upward through the relative movement of the arc-shaped mandrel. At the same time, the water inlet hole assists in rapid pressure relief and liquid discharge, and the reaction liquid drives the cleaning component to rotate to prevent the outside of the water inlet hole from being blocked by fine powder, ultimately ensuring that the second sieve plate is quickly restored to normal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a hot filtration and cooling device for preparing a piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a fixed bed reactor in a hot filtration and cooling device for preparing a piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of the first sieve plate and the second sieve plate in a hot filtration and cooling device for preparing a piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the support plate and sleeve connection structure in the hot filtration and cooling device for preparing piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the water inlet pipe and the outer structure of the hot filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of the sleeve in the hot filtration and cooling device for preparing piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of the memory spring in the extended state in the hot filtration cooling device for preparing the piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention; Figure 8 This is a schematic structural diagram of the memory spring in the contracted state in the hot filtration cooling device for preparing the piperidine hexamethylenediamine light stabilizer according to an embodiment of the present invention.

[0016] Explanation of the accompanying drawings: 100, fixed bed reactor; 101, connecting pipe; 102, catalyst; 103, first sieve plate; 104, second sieve plate; 105, side plate; 106, guide column; 107, telescopic spring; 200, crystallization kettle; 300, sleeve; 301, spiral guide vane; 302, hollow tube; 303, water inlet pipe; 304, water inlet hole; 400, arc-shaped head; 401, telescopic rod; 402, movable ring; 403, memory spring; 500, propeller; 501, cleaning plate; 502, brush; 600, support plate. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0018] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0019] Throughout this specification, reference to terms such as "an embodiment," "one embodiment," "some embodiments," "exemplarily," and "one embodiment" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or embodiment. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or embodiments.

[0020] The terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features.

[0021] like Figure 1-8 As shown, the embodiment of the present invention provides a heat filtration and cooling device for preparing piperidine hexamethylenediamine light stabilizer, comprising a fixed bed reactor 100, a catalyst 102, a second sieve plate 104, a telescopic spring 107, a sleeve 300, a water inlet pipe 303, a water inlet hole 304, an arc-shaped head 400, a memory spring 403 and a cleaning component. The catalyst 102 is arranged inside the fixed bed reactor 100, and the second sieve plate 104 can be vertically lifted and arranged at the lower end of the catalyst 102 and has a bottom edge provided with Telescopic spring 107, multiple sleeves 300 are arranged at the lower end of the second sieve plate 104 and correspond to the sieve holes, the water inlet pipe 303 is fixed at the upper end of the sleeve 300 and a water inlet hole 304 is provided in the side wall, the memory spring 403 is arranged inside the sleeve 300, and the arc-shaped top head 400 located at the upper end of the water inlet pipe 303 is driven vertically by telescopic movement. The arc-shaped top head 400 can guide the ambient heat to the memory spring 403, and the cleaning component is arranged on the outside of the water inlet pipe 303, and is driven to rotate and clean by the reaction liquid.

[0022] In this embodiment, the mixed liquid obtained by uniformly mixing Schiff base and anhydrous ethanol with an initial temperature of 70-80°C is discharged from the pretreatment kettle and introduced into the fixed bed reactor 100 under pressure with hydrogen, and then reacts with the catalyst 102 to obtain a hydrogenation reaction liquid. In this process, the second sieve plate 104 acts as a physical barrier to prevent the catalyst 102 particles from flowing out of the fixed bed reactor 100 with the reactants. The reaction liquid flows downward through the second sieve plate 104, where the reaction liquid contacts a plurality of arc-shaped headers 400 located at the lower end of the second sieve plate 104. Since the reaction liquid has a relatively high temperature, the arc-shaped header 400 will direct the heat to the memory spring 403, and the memory spring 403 will shrink at high temperatures. When the arc-shaped plug 400 is located above the sieve hole, it encounters the reaction liquid and guides the heat. Then, the memory spring 403 contracts due to the heat and drives the arc-shaped plug 400 to drop below the sieve hole again. At this time, the sieve hole is unblocked. When the powder accumulates and is densely stuck in the sieve holes, the memory spring 403 stretches to push the arc-shaped plug 400 to rise vertically and cannot be pushed to dredge. As multiple sieve holes are blocked, the reaction liquid is retained at the upper end of the second sieve plate 104. As the water pressure increases, the second sieve plate 104 moves vertically downward and compresses the telescopic spring 107. When the second sieve plate 104 moves downward, it pushes the arc-shaped plug 400 to move downward synchronously and compresses the memory spring 403. When the arc-shaped plug 400 moves to the point where it blocks the upper end of the water inlet pipe 303 and cannot move further downward, the second sieve plate 104 continues to move downward relative to the arc-shaped plug 400, and the arc-shaped plug 400 rigidly pushes out the blockage in the sieve holes. At this time, the arc-shaped plug 400 and the water inlet pipe 303 are 3 is located at the upper end of the sieve hole, and the arc-shaped head 400 guides the heat to the memory spring 403. However, at this time, the memory spring 403 is compressed, so the shape does not change. The reaction liquid retained at the upper end of the second sieve plate 104 flows downward through the gap of the sieve hole, but the pressure cannot be relieved in a short time. Part of the reaction liquid enters the water inlet pipe 303 through the water inlet hole 304, and then is discharged through the bottom end of the sleeve 300, assisting in rapid pressure relief and liquid discharge. During this process, the rapid flow of the reaction liquid drives the cleaning component to rotate and clean, thereby preventing the outer side of the water inlet hole 304 from being blocked by fine powder. After the pressure relief is completed, the second sieve plate 104 moves upward and resets under the push of the telescopic spring 107 to restore its deformation. At this time, the arc-shaped head 400 is located at the lower end of the sieve hole and the second sieve plate 104 is used normally. When the sieve holes of the second sieve plate 104 are blocked and the arc-shaped plug 400 has no heat transfer, the memory spring 403 extends and pushes the arc-shaped plug 400 to rise for dredging. After dredging, the arc-shaped plug 400 contacts the reaction liquid for heat transfer, and the memory spring 403 contracts to drive the arc-shaped plug 400 to descend and be located at the lower end of the sieve hole, which can quickly dredge the corresponding blocked sieve hole; when the fine powder is densely accumulated, the memory spring 403 pushes the arc-shaped plug 400 to rise and cannot be pushed open. As multiple sieve holes are blocked, the reaction liquid is retained and the water pressure increases, driving the second sieve plate 104 to move downward, and the blockage in the sieve hole is rigidly pushed out upward by the relative movement of the arc-shaped plug 400, and at the same time, the water inlet hole 304 is used to assist in rapid pressure relief and liquid discharge, and the reaction liquid drives the cleaning component to rotate, so as to avoid the outer side of the water inlet hole 304 being blocked by fine powder, and finally ensure that the second sieve plate 104 is quickly restored to normal use.

[0023] like Figure 6 、 Figure 7 and Figure 8 As shown, optionally, a spiral guide plate 301 is fixedly provided on the inner wall of the sleeve 300, a hollow tube 302 is fixedly provided in the middle of the spiral guide plate 301, a memory spring 403 is arranged inside the hollow tube 302, the bottom end of the memory spring 403 is fixedly provided on the inner bottom surface of the hollow tube 302 and a movable ring 402 is fixedly provided on the upper end, the outer side of the movable ring 402 is slidingly connected to the inner surface of the hollow tube 302, the middle part of the hollow tube 302 is slidingly connected to the telescopic rod 401, the telescopic rod 401 is located on the inner side of the memory spring 403, the inner side of the middle part of the movable ring 402 is rotatably connected to the outer side of the telescopic rod 401 through a bearing, and the middle part of the bottom end of the arc-shaped head 400 is fixedly provided on the upper end of the telescopic rod 401.

[0024] In this embodiment, the arc-shaped plug 400 guides the heat of the reaction liquid to the memory spring 403. The memory spring 403 drives the movable ring 402 to move vertically downward by contraction, and then drives the telescopic rod 401 to move vertically downward synchronously through the bearing, thereby driving the arc-shaped plug 400 to move vertically downward relative to the sleeve 300. When the arc-shaped plug 400 cannot transfer heat, the memory spring 403 restores its original length and extends, driving the telescopic rod 401 to rise vertically through the movable ring 402, driving the arc-shaped plug 400 to rise relatively vertically. Here, the telescopic rod 401 can rotate within the movable ring 402, thereby driving the arc-shaped plug 400 to rotate relatively. Figure 7 and Figure 8 As shown, the arrow direction is the extension and compression direction of the memory spring 403, showing the telescopic rod 401 driving the arc-shaped head 400 to rise and fall vertically. The vertical rise is used to clear the sieve holes, and the vertical fall is used to reset and seal the upper end of the water inlet pipe 303 at the same time, ensuring that the subsequent reaction liquid can only enter through the water inlet hole 304, avoiding fine powder from entering the interior through the upper end and causing internal blockage.

[0025] like Figure 8As shown, optionally, when the memory spring 403 contracts, it drives the bottom end of the arc-shaped head 400 to seal the upper end of the water inlet pipe 303.

[0026] In this embodiment, the memory spring 403 is made of a copper-zinc-aluminum alloy or a nickel-titanium alloy. When heated, the memory spring 403 contracts, driving the arc-shaped plug 400 to move vertically downward and seal the upper end of the water inlet pipe 303. As a result, the arc-shaped plug 400 and the lower end structure form a rigid whole. When the second sieve plate 104 moves vertically downward, the relative movement of the arc-shaped plug 400 forces the interior of the sieve holes to be cleared. like Figure 6 and Figure 8 As shown, optionally, multiple water inlet holes 304 are evenly opened along the outer peripheral side wall of the water inlet pipe 303, and a propeller 500 is fixedly installed on the outer side of the bottom end of the telescopic rod 401 at the lower end of the arc-shaped head 400, and the propeller 500 rotates to drive the cleaning component to rotate and clean.

[0027] In this embodiment, the retained reaction liquid quickly enters the water inlet pipe 303 through the water inlet hole 304 due to the high water pressure, and then enters the sleeve 300. Since the sleeve 300 is provided with a spiral guide plate 301, the reaction liquid is output downward along the spiral guide plate 301, and the spiral guide plate 301 forces the reaction liquid to rotate and flow. The fast-flowing rotating reaction liquid drives the propeller 500 to rotate. Since the telescopic rod 401 drives the arc-shaped top head 400 to rotate relative to the sleeve 300, the rotation of the propeller 500 drives the arc-shaped top head 400 to rotate, and then drives the cleaning component to rotate and clean.

[0028] like Figure 6 and Figure 8 As shown, optionally, the cleaning component includes a cleaning plate 501 and bristles 502 , the end of the cleaning plate 501 is fixed on the bottom end of the arc-shaped head 400 , the bristles 502 are fixed on the side of the cleaning plate 501 , and the bristles 502 are in squeeze contact with the outside of the water inlet pipe 303 .

[0029] In this embodiment, the rotation of the propeller 500 drives the arc-shaped head 400 to rotate, which in turn drives the cleaning plate 501 to rotate, thereby driving the bristles 502 to rotate, removing fine powder attached to the outside of the water inlet pipe 303 to avoid clogging the water inlet hole 304.

[0030] like Figure 2As shown, optionally, the outer side of the second sieve plate 104 is slidably connected to the inner wall of the fixed bed reactor 100, and guide columns 106 are symmetrically arranged inside the two sides of the second sieve plate 104. Side plates 105 are symmetrically fixed at both ends of the guide columns 106, and the side surfaces of the side plates 105 are fixed on the inner wall of the fixed bed reactor 100. The second sieve plate 104 and the guide columns 106 are slidably connected to each other, and the outer side of the guide columns 106 is covered with a telescopic spring 107, and the upper and lower ends of the telescopic spring 107 are fixedly connected to the bottom end of the second sieve plate 104 and the upper end of the side plate 105, respectively.

[0031] In this embodiment, the second sieve plate 104 can be vertically raised and lowered inside the fixed bed reactor 100. When the sieve holes are blocked, causing the reaction liquid to be retained and the water pressure to increase, the second sieve plate 104 moves vertically downward and compresses the telescopic spring 107. When the sieve holes are unblocked, the water pressure decreases, and the second sieve plate 104 moves upward and resets under the push of the telescopic spring 107 to restore its deformation.

[0032] like Figure 1 and Figure 2 As shown, optionally, the bottom end of the fixed bed reactor 100 is fixedly connected to a connecting pipe 101, the liquid outlet end of the connecting pipe 101 is fixedly connected to the liquid inlet end of the external crystallization kettle 200, the catalyst 102 is filled in the upper end of the fixed bed reactor 100, and the bottom end of the catalyst 102 is provided with a first sieve plate 103, and the outer side of the first sieve plate 103 is fixed on the inner wall of the fixed bed reactor 100.

[0033] In this embodiment, the mixed liquid obtained by uniformly mixing the Schiff base and anhydrous ethanol is discharged from the pretreatment kettle and introduced into the fixed bed reactor 100 under pressure with hydrogen, and then reacted with the catalyst 102 to obtain a hydrogenation reaction liquid. The reaction liquid flows through the first sieve plate 103 to the second sieve plate 104, and finally flows through the connecting pipe 101 to the forward and rear towers for distillation, and is cooled and crystallized through the crystallization kettle 200 to obtain piperidine hexamethylenediamine. Since it is a prior art, the reaction principle, process and related equipment used will not be repeated here.

[0034] like Figure 2 、 Figure 3 and Figure 4 As shown, optionally, the sieve hole diameters of the first sieve plate 103 and the second sieve plate 104 gradually decrease from top to bottom, the outer sides of the multiple sleeves 300 are fastened to each other by a support plate 600, the end of the support plate 600 is fixedly connected to the inner wall of the fixed bed reactor 100, and the arc-shaped head 400 matches the corresponding sieve hole size.

[0035] In this embodiment, the first sieve plate 103 has a larger sieve hole diameter to block larger impurities, and the second sieve plate 104 has a smaller sieve hole diameter to block smaller fine powder. The risk of clogging is reduced by setting a multi-layer filtering structure. The sleeve 300 is supported by the support plate 600, and the arc-shaped head 400 matches the corresponding sieve hole size to facilitate effective dredging of the sieve hole.

[0036] like Figure 2 As shown, the catalyst 102 is optionally filled in multiple layers.

[0037] In this embodiment, the fixed bed palladium, rhodium and carbon catalyst 102 is used in an amount of 5% of the weight of a single batch of mixed liquid, which weighs 216 kg. A three-layer catalyst 102 is used to fill the fixed bed reactor 100. Since this is existing technology, it will not be described here in detail.

[0038] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A heat filtration and cooling device for preparing piperidine hexamethylenediamine light stabilizer, characterized in that: The invention comprises a fixed bed reactor (100), a catalyst (102), a second sieve plate (104), a telescopic spring (107), a sleeve (300), a water inlet pipe (303), a water inlet hole (304), an arc-shaped head (400), a memory spring (403) and a cleaning component, wherein the catalyst (102) is arranged inside the fixed bed reactor (100), the second sieve plate (104) can be vertically lifted and arranged at the lower end of the catalyst (102) and a telescopic spring (107) is provided at the bottom edge, a plurality of the sleeves (300) are provided. 0) is arranged at the lower end of the second sieve plate (104) and corresponds to the sieve hole, the water inlet pipe (303) is fixedly arranged at the upper end of the sleeve (300) and a water inlet hole (304) is provided in the side wall, the memory spring (403) is arranged inside the sleeve (300), and the arc-shaped top head (400) located at the upper end of the water inlet pipe (303) is driven to rise and fall vertically by telescopic movement, and the arc-shaped top head (400) can guide the ambient heat to the memory spring (403), and the cleaning component is arranged outside the water inlet pipe (303) and is driven to rotate and clean by the reaction liquid.

2. The heat filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 1, wherein The inner wall of the sleeve (300) is fixedly provided with a spiral guide plate (301), the middle part of the spiral guide plate (301) is fixedly provided with a hollow tube (302), the memory spring (403) is arranged inside the hollow tube (302), the bottom end of the memory spring (403) is fixedly provided on the inner bottom surface of the hollow tube (302) and the upper end is fixedly provided with a movable ring (402), the outer side of the movable ring (402) is slidably connected to the inner surface of the hollow tube (302), the middle part of the hollow tube (302) is slidably connected with a telescopic rod (401), the telescopic rod (401) is located inside the memory spring (403), the inner side of the middle part of the movable ring (402) is rotatably connected to the outer side of the telescopic rod (401) through a bearing, and the middle part of the bottom end of the arc-shaped head (400) is fixedly provided on the upper end of the telescopic rod (401).

3. The heat filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 1, wherein: When the memory spring (403) contracts, it drives the bottom end of the arc-shaped head (400) to seal the upper end of the water inlet pipe (303).

4. The heat filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 1, wherein: A plurality of water inlet holes (304) are evenly arranged along the outer peripheral side wall of the water inlet pipe (303); a propeller (500) is fixedly mounted on the outer side of the bottom end of the telescopic rod (401) at the lower end of the arc-shaped head (400); and the propeller (500) rotates to drive the cleaning component to rotate and clean.

5. The heat filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 1, wherein: The cleaning assembly comprises a cleaning plate (501) and bristles (502), wherein the end of the cleaning plate (501) is fixed on the bottom end of the arc-shaped head (400), and the bristles (502) are fixed on the side of the cleaning plate (501), and the bristles (502) are in extrusion contact with the outer side of the water inlet pipe (303).

6. The heat filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 1, wherein: The outer side of the second sieve plate (104) is slidably connected to the inner wall of the fixed bed reactor (100), and guide columns (106) are symmetrically arranged inside the two sides of the second sieve plate (104). Side plates (105) are symmetrically fixed at both ends of the guide columns (106), and the side surfaces of the side plates (105) are fixed on the inner wall of the fixed bed reactor (100). The second sieve plate (104) and the guide columns (106) are slidably connected to each other, and the outer side of the guide columns (106) is covered with a telescopic spring (107), and the upper and lower ends of the telescopic spring (107) are respectively fixedly connected to the bottom end of the second sieve plate (104) and the upper end of the side plate (105).

7. The heat filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 1, wherein: The bottom end of the fixed bed reactor (100) is fixedly connected to a connecting pipe (101), the liquid outlet end of the connecting pipe (101) is fixedly connected to the liquid inlet end of the external crystallization kettle (200), the catalyst (102) is filled in the upper end of the fixed bed reactor (100), and the bottom end of the catalyst (102) is provided with a first sieve plate (103), and the outer side of the first sieve plate (103) is fixed on the inner wall of the fixed bed reactor (100).

8. The heat filtration and cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 7, wherein: The sieve holes of the first sieve plate (103) and the second sieve plate (104) gradually decrease in size from top to bottom. The outer sides of the plurality of sleeves (300) are fastened to each other via a support plate (600). The end of the support plate (600) is fixedly connected to the inner wall of the fixed bed reactor (100). The arc-shaped head (400) matches the size of the corresponding sieve hole.

9. The heat filtration cooling device for preparing piperidine hexamethylenediamine light stabilizer according to claim 1, wherein: The catalyst (102) is filled in multiple layers.

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