Preparation reaction furnace of high-purity single-walled carbon nanotube

Abstract

The application discloses a preparation reaction furnace for high-purity single-wall carbon nanotubes and relates to the technical field of carbon nanotube production. The preparation reaction furnace comprises a tubular reaction furnace, a carbon source injection pipeline and a catalyst preparation device are communicated with one end of the tubular reaction furnace, the carbon source injection pipeline is used for injecting hydrocarbon gas into the tubular reaction furnace, a crucible for placing catalyst particles and a heating assembly for heating and gasifying the catalyst are arranged in the catalyst preparation device, and inert gas is injected into the catalyst preparation device to bring the gasified catalyst into the tubular reaction furnace. The preparation reaction furnace for high-purity single-wall carbon nanotubes can heat and gasify the catalyst particles in the crucible through the heating assembly, the gasified catalyst is brought into the tubular reaction furnace through the inert gas, hydrocarbon gas is injected into the tubular reaction furnace as a carbon source, single-wall carbon nanotubes are formed and deposited through the tubular reaction furnace, and thus the reaction is safely and stably carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon nanotube production, and particularly relates to a preparation reaction furnace for high-purity single-wall carbon nanotubes. BACKGROUND

[0002] Single-wall carbon nanotubes are a kind of carbon nanotubes, which have unique structure and performance and have wide application prospects in the fields of material science, electronics and biomedicine. At present, the preparation methods of single-wall carbon nanotubes mainly include arc discharge method, laser evaporation method and chemical vapor deposition method.

[0003] For example, a patent document with the application publication number CN119980200A and the application publication date of May 13, 2025, and the name of “Single-wall carbon nanotube and preparation method and device thereof” includes: an inert gas cylinder, a carrier gas injection pipeline, a gas flow controller, a cavity, a positive electrode rod, a negative electrode rod, two graphite felt electrodes woven with carbon fibers, a stainless steel screen, a filter membrane, a graphite platform and a tube furnace.

[0004] In the prior art, when single-wall carbon nanotubes are prepared, the solid catalyst is generally directly heated and gasified and introduced into the reaction furnace, which results in a low single-wall rate (i.e., low purity) when carbon nanotubes are deposited. SUMMARY

[0005] The purpose of the present application is to provide a preparation reaction furnace for high-purity single-wall carbon nanotubes to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a tube furnace, and one end of the tube furnace is connected with:

[0008] A carbon source injection pipeline for introducing hydrocarbon gas into the tube furnace;

[0009] A catalyst preparation device, which is provided with a crucible for placing catalyst particles and a heating assembly for heating and gasifying the catalyst, and inert gas is introduced into the catalyst preparation device to bring the gasified catalyst into the tube furnace.

[0010] The preparation reaction furnace for high-purity single-wall carbon nanotubes, wherein the ratio of methane, hydrogen and argon in the hydrocarbon is 1:1:5.

[0011] The preparation reaction furnace for high-purity single-wall carbon nanotubes, wherein the heating assembly comprises an inductive heater and an infrared temperature detector.

[0012] The preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a hollow main body, an air inlet and an air outlet are arranged on the top of the main body.

[0013] The preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a hollow main body, an air inlet and an air outlet are arranged on the top of the main body.

[0014] The preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a hollow main body, an air inlet and an air outlet are arranged on the top of the main body.

[0015] The preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a hollow main body, an air inlet and an air outlet are arranged on the top of the main body.

[0016] The preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a hollow main body, an air inlet and an air outlet are arranged on the top of the main body.

[0017] The preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a hollow main body, an air inlet and an air outlet are arranged on the top of the main body.

[0018] The preparation reaction furnace for high-purity single-wall carbon nanotubes comprises a hollow main body, an air inlet and an air outlet are arranged on the top of the main body.

[0019] In the above technical solution, the preparation reaction furnace for high-purity single-wall carbon nanotubes provided by the application can heat and vaporize the catalyst particles in the crucible through the heating assembly, the vaporized catalyst is carried into the tubular reaction furnace by the inert gas, the hydrocarbon gas is introduced into the tubular reaction furnace as the carbon source, and the single-wall carbon nanotubes are formed and deposited in the tubular reaction furnace, so that the reaction is safely and stably carried out, and the single-wall rate of the carbon nanotubes (i.e. the purity of the single-wall carbon nanotubes) is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0021] Figure 1 The overall structural schematic diagram provided by the embodiment of the present application is shown in the figure.

[0022] Figure 2 The internal structural schematic diagram of the main body provided by another embodiment of the present application is shown in the figure.

[0023] Figure 3 The internal structural schematic diagram of the feeding port provided by another embodiment of the present application is shown in the figure.

[0024] Figure 4 The structural schematic diagram of the arc-shaped plate provided by another embodiment of the present application is shown in the figure.

[0025] Figure 5 The structural schematic diagram of the extension provided by another embodiment of the present application is shown in the figure.

[0026] Figure 6 The structural schematic diagram of the abutting rod provided by another embodiment of the present application is shown in the figure.

[0027] Figure 7 The structural schematic diagram of the guide groove provided by another embodiment of the present application is shown in the figure.

[0028] Figure 8 The structural schematic diagram of the recess provided by another embodiment of the present application is shown in the figure.

[0029] Figure 9 The structural schematic diagram of the movable rod provided by another embodiment of the present application is shown in the figure.

[0030] Explanation of reference signs:

[0031] 1, tubular reaction furnace; 2, carbon source injection pipeline; 3, catalyst preparation device; 31, main body; 32, crucible; 41, inductive heater; 42, infrared temperature detector; 51, gas inlet; 52, gas outlet; 6, feeding port; 7, lifting pipe; 8, top cover; 9, blocking plate; 10, preheating part; 11, arc-shaped plate; 111, rotating shaft; 12, protruding part; 13, extension; 14, abutting rod; 151, first spiral groove; 152, vertical groove; 153, second spiral groove; 16, recess; 17, conical block; 18, movable rod; 19, triangular plate; 20, connecting rod. DETAILED DESCRIPTION

[0032] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0033] Referring to Figures 1-9 The embodiment of the present application provides a preparation reaction furnace for high-purity single-wall carbon nanotubes, which comprises a tubular reaction furnace 1, a carbon source injection pipeline 2 and a catalyst preparation device 3 communicated with one end of the tubular reaction furnace 1, the carbon source injection pipeline 2 is used for injecting hydrocarbon gas into the tubular reaction furnace 1, and the catalyst preparation device 3 is provided with a crucible 32 for placing catalyst particles and a heating assembly for heating and gasifying the catalyst, and inert gas is injected into the catalyst preparation device 3 to bring the gasified catalyst into the tubular reaction furnace 1.

[0034] Specifically, the preparation process of the single-wall carbon nanotubes can be roughly divided into catalyst preparation, vapor deposition, carbon nanotube collection and carbon nanotube purification. In the preparation process of the catalyst, the existing technology generally directly heats and gasifies the solid catalyst and injects it into the reaction furnace. The innovation of the embodiment of the present application is that the heating assembly is arranged in the catalyst preparation device 3, the heating assembly can select the inductively coupled heating structure in the existing technology, which can efficiently and quickly gasify the catalyst particles to form gaseous catalyst particles, then inert gas (such as nitrogen or argon) is injected into the catalyst preparation device 3 to bring the gaseous catalyst particles into the tubular reaction furnace 1, and then hydrocarbon (such as methane) is injected into the tubular reaction furnace 1 as a carbon source, so that the single-wall carbon nanotubes are safely and stably formed and deposited in the tubular reaction furnace 1, and the single-wall rate (i.e. the purity of the single-wall carbon nanotubes) of the carbon nanotubes is improved.

[0035] In another embodiment of the present application, the ratio of methane, hydrogen and argon in the hydrocarbon is 1:1:5. The heating assembly comprises an inductive heater 41 and an infrared temperature detector 42. Specifically, the catalyst can be selected from high-purity iron, cobalt, nickel or organic metal (ferrocene, etc.); the hydrocarbon gas is a mixture of methane, propylene, acetylene, ethanol and hydrogen, nitrogen, argon, and the preferred ratio is CH4:H2:Ar=1:1:5. The inductive heater 41 is arranged at the crucible 32 to heat the catalyst, and the infrared temperature detector 42 is arranged in the catalyst preparation device 3 to monitor the change of temperature.

[0036] In the embodiment of the present application, three sets of embodiment data are provided, one, the gasification temperature of the catalyst is 1800 DEG C, the gasification rate is 0.84 g / h; the inert gas flux is 200 ml / min; the hydrocarbon flux is 800 ml / min; the single-wall rate is 90.2%, and the yield is 0.64 g / h. Two, the gasification temperature of the catalyst is 2100 DEG C, the gasification rate is 1.76 g / h; the inert gas flux is 200 ml / min; the hydrocarbon flux is 800 ml / min; the single-wall rate is 88.7%, and the yield is 1.34 g / h. Three, the gasification temperature of the catalyst is 2400 DEG C, the gasification rate is 2.97 g / h; the inert gas flux is 200 ml / min; the hydrocarbon flux is 800 ml / min; the single-wall rate is 85.4%, and the yield is 5.23 g / h. It can be seen that by controlling the gasification temperature, the inert gas flux and the hydrocarbon flux, the single-wall rate of the carbon nanotube (i.e. the purity of the single-wall carbon nanotube) can be effectively improved.

[0037] In still another embodiment of the present application, further, the catalyst preparation device 3 comprises a hollow main body 31, and the top of the main body 31 is provided with a gas inlet 51 and a gas outlet 52. Specifically, the main body 31 is in a hollow cylindrical structure as a whole, the crucible 32 is arranged on the bottom wall in the main body 31, the inductive heater 41 extends from one side of the main body 31 to the crucible 32 to heat the catalyst in the crucible 32, and the infrared temperature detector 42 is arranged on the top of the main body 31; the gas inlet 51 is used to introduce the inert gas into the main body 31, and the gas outlet 52 is communicated with the tubular reaction furnace 1, so that after the catalyst is gasified, the inert gas and the gasified catalyst particles enter the tubular reaction furnace 1 from the gas outlet 52 to generate the single-wall carbon nanotube in the tubular reaction furnace 1.

[0038] Further, the main body 31 is configured with a feeding port 6, a lifting pipe 7 is slidably connected in the feeding port 6, a top cover 8 is arranged at the top of the feeding port 6, and a sealing plate 9 is hingedly connected at the bottom of the lifting pipe 7. Specifically, the feeding port 6 is vertically configured on the top wall of the main body 31, the outer wall of the lifting pipe 7 is matched with the inner wall of the feeding port 6, and the two are slidably (sealingly) connected, and the feeding port 6 and the lifting pipe 7 are both located above the crucible 32; the connection between the top cover 8 and the feeding port 6 can be selected from the prior art screw connection or clamping, so that the top cover 8 can open or block the feeding port 6; the sealing plate 9 is symmetrically provided with two (a rotating structure can be arranged on the lifting pipe 7 to drive the two sealing plates 9 to rotate), when the two sealing plates 9 are close to each other and block the lifting pipe 7, the two sealing plates 9 are conical as a whole, and correspondingly, when the two sealing plates 9 are away from each other, the lifting pipe 7 is opened; in this way, when the lifting pipe 7 rises, the sealing plate 9 blocks the bottom end of the lifting pipe 7, and the top cover 8 opens the feeding port 6, the catalyst can be put into the lifting pipe 7 through the feeding port 6; after the catalyst is put in, the top cover 8 blocks the feeding port 6, and after the catalyst in the crucible 32 is used up, the lifting pipe 7 is lowered and the sealing plate 9 opens the lifting pipe 7 to add the catalyst in the lifting pipe 7 into the crucible 32. The advantages are that, first, during the feeding process, the internal space of the main body 31 is isolated from the external space (isolated by the top cover 8 or the sealing plate 9), so as to avoid excessive heat loss in the main body 31; second, the lifting pipe 7 is close to the crucible 32 only when the catalyst is put in, and is away from the crucible 32 at other times, so as to avoid the situation that the lifting pipe 7 and other structures are too close to the crucible 32 and the temperature is too high.

[0039] Preferably, the bottom of the lifting pipe 7 is configured as a preheating part 10, and the lifting pipe 7 is hingedly connected with an arc-shaped plate 11 for covering the preheating part 10. Specifically, the lifting pipe 7 itself has a heat insulation effect, in order to preheat the catalyst in the lifting pipe 7, the preheating part 10 is configured at the bottom of the lifting pipe 7, and the preheating part 10 has a lower heat insulation effect; the arc-shaped plate 11 is provided with two (a rotating structure can be provided on the lifting pipe 7 to drive the two arc-shaped plates 11 to rotate), and when the two arc-shaped plates 11 are close to the preheating part 10, the preheating part 10 can be surrounded and covered, so as to improve the heat insulation effect of the position of the preheating part 10, and correspondingly, when the two arc-shaped plates 11 are away from the preheating part 10, the high temperature in the main body 31 can easily preheat the catalyst in the lifting pipe 7. Optionally, the preheating part 10 is selected as a filter screen. Optionally, the thickness of the preheating part 10 is less than the thickness of the pipe wall of the lifting pipe 7. The preheating part 10 is annular as a whole, and for example, when the preheating part 10 is selected as a filter screen, the filter hole of the filter screen is smaller than the particle size of the catalyst, so as to avoid the catalyst from leaking out of the filter screen as much as possible; when the two arc-shaped plates 11 are away from the preheating part 10, the filter screen is exposed, so that the heat in the main body 31 enters the lifting pipe 7 to preheat the catalyst (the top cover 8 on the feeding port 6 can avoid heat overflow as much as possible), when the two arc-shaped plates 11 surround and cover the preheating part 10, the overall heat insulation effect of the lifting pipe 7 and the arc-shaped plate 11 is high, which can effectively insulate the heat transfer between the inside and outside of the lifting pipe 7, and avoid the heat in the main body 31 from overflowing from the lifting pipe 7 when the top cover 8 is opened.

[0040] Preferably, the lifting tube 7 has feeding state, preheating state and feeding state from top to bottom in the feeding port 6. In the feeding state, the top cover 8 opens the feeding port 6, the arc-shaped plate 11 covers the preheating part 10, and the blocking plate 9 blocks the lifting tube 7, so as to put the catalyst into the feeding port 6 and the lifting tube 7. In the preheating state, the top cover 8 closes the feeding port 6, the arc-shaped plate 11 is away from the preheating part 10, and the blocking plate 9 blocks the lifting tube 7, so as to preheat the catalyst in the lifting tube 7 through the preheating part 10. In the feeding state, the top cover 8 closes the feeding port 6, the arc-shaped plate 11 is away from the preheating part 10, and the blocking plate 9 opens the lifting tube 7, so as to add the preheated catalyst into the crucible 32. Specifically, in the embodiment, the main body 31 can be provided with a driving assembly to drive the lifting tube 7 to ascend and descend along the feeding port 6. The driving assembly can be a cylinder or a lead screw structure (not shown) in the prior art. During the ascending and descending of the lifting tube 7, it has three states in sequence to adapt to three working conditions. In the feeding state, the internal space of the lifting tube 7 and the internal space of the main body 31 are isolated, and the catalyst can be put into the lifting tube 7 through the feeding port 6, so as to avoid the heat loss in the main body 31 as much as possible. In the preheating state, the lifting tube 7 is isolated from the outside and is in communication with the internal space of the main body 31 through the preheating part 10 (when the preheating part 10 is a filter screen), so as to preheat the catalyst in the lifting tube 7. In the feeding state, the blocking plate 9 opens the bottom opening of the lifting tube 7, so as to add the catalyst into the crucible 32. Thus, the catalyst particles can be added into the crucible 32 without opening the catalyst preparation device 3.

[0041] In another embodiment of the present invention, the lifting pipe 7 is further provided with an elastic element for forcing the sealing plate 9 to seal the lifting pipe 7. The arc plate 11 is provided with a protrusion 12 and the sealing plate 9 is provided with an extension 13. As the arc plate 11 moves away from the preheating part 10, the protrusion 12 abuts against the extension 13 to force the sealing plate 9 to open the lifting pipe 7. Specifically, the elastic element can be a torsion spring structure (not shown) from the prior art, to force the two sealing plates 9 to move closer together and seal the lifting pipe 7; a rotating shaft 111 is constructed on the arc-shaped plate 11, the rotating shaft 111 is vertically arranged, and a movable groove is constructed on the main body 31. The top end of the rotating shaft 111 is movably disposed in the movable groove (rotatable and sliding), and the bottom end is rotatably connected to the lifting pipe 7. A protrusion 12 is constructed at the bottom of the rotating shaft 111, and one end of the extension 13 is fixed to the sealing plate 9, and the other end extends to the rotation stroke of the protrusion 12 (the lifting pipe 7 is constructed with a through groove for the extension 13 to move), so as to force the sealing plate 9 to open the lifting pipe 7 as the arc-shaped plate 11 moves away from the preheating part 10. With this configuration, a rotating structure is provided on the lifting pipe 7 to drive the rotating shaft 111 to rotate, so that the arc-shaped plate 11 and the sealing plate 9 can operate in an appropriate manner. The advantage is that when the lifting pipe 7 switches from the feeding state to the preheating state, the rotating shaft 111 rotates to drive the arc plate 11 away from the preheating part 10. At this time, the protrusion 12 does not contact the extension 13, and the sealing plate 9 seals the lifting pipe 7 under the action of the elastic element (e.g., Figure 4 and Figure 5 (As shown); when the lifting pipe 7 switches from the preheating state to the feeding state, the rotating shaft 111 continues to rotate, so as to drive the arc plate 11 to continue to move away from the preheating part 10. At the same time, the protrusion 12 abuts against the extension part 13, so as to force the sealing plate 9 to rotate through the extension part 13, thereby opening the bottom end of the lifting pipe 7 and putting the catalyst into the crucible 32.

[0042] Furthermore, the inner wall of the movable trough is constructed with an abutment rod 14, and the outer wall of the rotating shaft 111 is constructed with a guide groove. The abutment rod 14 is slidably disposed in the guide groove. The guide groove includes a first spiral groove 151, a vertical groove 152, and a second spiral groove 153 that are smoothly connected from bottom to top. When the lifting pipe 7 is in the feeding state, the abutment rod 14 is positioned relative to the bottom end of the first spiral groove 151, at which time the arc plate 11 covers the preheating part 10. During the process of the lifting pipe 7 descending to the preheating state, the abutment rod 14 is positioned relative to the bottom end of the first spiral groove 151. The bottom of the 151 tube moves to the bottom of the vertical groove 152. At this time, the lifting tube 7 descends slightly, the top cover 8 blocks the feeding port 6, and the arc plate 11 moves away from the preheating part 10 to preheat the catalyst in the lifting tube 7. During the process of the lifting tube 7 descending to the feeding state, the contact rod 14 moves from the bottom of the vertical groove 152 to the top of the second spiral groove 153. At this time, the lifting tube 7 approaches the crucible 32, and the arc plate 11 continues to move away from the preheating part 10 and drives the sealing plate 9 to open the bottom of the lifting tube 7 to put the catalyst into the crucible 32.

[0043] Further, a plurality of grooves 16 are arranged on the convex part 12. Specifically, in the process of switching the lifting pipe 7 to the feeding state, the plurality of grooves 16 on the convex part 12 sequentially abut against the supporting extension 13, so as to force the blocking plate 9 to repeatedly deflect and vibrate under the action of the elastic member and the plurality of grooves 16, thereby improving the feeding efficiency and avoiding the catalyst remaining in the lifting pipe 7.

[0044] Preferably, the lifting pipe 7 is provided with a tapered block 17, the movable rod 18 is fixed on the tapered block 17, a plurality of triangular plates 19 are arranged on the movable rod 18, the connecting rods 20 are hinged at the bottom of the tapered block 17, and the connecting rods 20 are hinged with the blocking plates 9. Specifically, in the process of the plurality of grooves 16 sequentially abutting against the extension 13, the blocking plate 9 repeatedly deflects and vibrates, so as to improve the feeding efficiency of the catalyst in the lifting pipe 7; in the embodiment, the top of the tapered block 17 and the triangular plate 19 are both in the shape of a sharp cone, so as to avoid the catalyst falling on the tapered block 17 and the triangular plate 19 and failing to fall; the two connecting rods 20 are respectively hinged with the two blocking plates 9, so as to drive the tapered block 17, the movable rod 18 and the plurality of triangular plates 19 to vertically vibrate in the process of the two blocking plates 9 synchronously deflecting and vibrating, so as to achieve the effect of pushing and vibrating the catalyst downward, and avoid the catalyst in the lifting pipe 7 from being accumulated and failing to fall.

[0045] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A reactor for preparing high-purity single-walled carbon nanotubes, comprising a tubular reactor, characterized in that, One end of the tubular reactor is connected to: A carbon source injection pipe is used to introduce hydrocarbon gas into a tubular reactor. A catalyst preparation apparatus is provided with a crucible for placing catalyst particles and a heating component for heating and gasifying the catalyst. An inert gas is introduced into the catalyst preparation apparatus to carry the gasified catalyst into a tubular reactor. The catalyst preparation device includes a hollow main body with an air inlet and an air outlet at the top; a feeding port is constructed on the main body, a lifting pipe is slidably connected inside the feeding port, a top cover is provided at the top of the feeding port, and a sealing plate is hinged to the bottom of the lifting pipe. When the lifting pipe rises, the sealing plate seals the bottom of the lifting pipe, and the top cover opens the feeding port, the catalyst is added into the lifting pipe through the feeding port; after the catalyst is added, the top cover seals the feeding port. After the catalyst in the crucible is used up, the lifting pipe descends and the sealing plate opens the lifting pipe to add the catalyst in the lifting pipe into the crucible. The bottom of the lifting pipe is a preheating section, and an arc-shaped plate for covering the preheating section is hinged on the lifting pipe. The lifting tube is provided with an elastic element for forcing the sealing plate to seal the lifting tube. The arc plate is provided with a protrusion and the sealing plate is provided with an extension. As the arc plate moves away from the preheating part, the protrusion abuts against the extension to force the sealing plate to open the lifting tube. The curved plate has a rotating shaft, which is set vertically. The main body has a movable groove, the top of the rotating shaft is movably set in the movable groove, and the bottom end is rotatably connected to the lifting tube. A protrusion is constructed at the bottom of the rotating shaft. The inner wall of the movable trough is equipped with a contact rod, and the outer wall of the rotating shaft is equipped with a guide groove. The contact rod is slidably disposed in the guide groove, which includes a first spiral groove, a vertical groove, and a second spiral groove that are smoothly connected end to end from bottom to top. During the descent of the lifting pipe, the contact rod moves relative to the bottom end of the first spiral groove to the bottom end of the vertical groove. At this time, the lifting pipe descends slightly, the top cover seals the feeding port, and the arc plate moves away from the preheating part to preheat the catalyst in the lifting pipe. When the contact rod moves relative to the top end of the second spiral groove, the lifting pipe approaches the crucible, the arc plate continues to move away from the preheating part, and drives the sealing plate to open the bottom end of the lifting pipe to put the catalyst into the crucible.

2. The reactor for preparing high-purity single-walled carbon nanotubes according to claim 1, characterized in that, The hydrocarbon contains methane, hydrogen, and argon in a ratio of 1:1:

5.

3. The reactor for preparing high-purity single-walled carbon nanotubes according to claim 1, characterized in that, The heating assembly includes an inductive heater and an infrared thermometer.

4. The reactor for preparing high-purity single-walled carbon nanotubes according to claim 1, characterized in that, The preheating section uses a filter screen.

5. The reactor for preparing high-purity single-walled carbon nanotubes according to claim 1, characterized in that, The thickness of the preheating section is less than the wall thickness of the riser pipe.

6. The reactor for preparing high-purity single-walled carbon nanotubes according to claim 1, characterized in that, The lifting pipe has three states from top to bottom within the feeding port: feeding state, preheating state, and adding state. In the feeding state, the top cover opens the feeding port, the arc-shaped plate covers the preheating section, and the sealing plate seals the lifting pipe to add catalyst into the feeding port and the lifting pipe. In the preheating state, the top cover closes the feeding port, the arc-shaped plate moves away from the preheating section, and the sealing plate seals the lifting pipe to allow heat to preheat the catalyst in the lifting pipe through the preheating section. In the adding state, the top cover closes the feeding port, the arc-shaped plate moves away from the preheating section, and the sealing plate opens the lifting pipe to add the preheated catalyst into the crucible.

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