A cleaning filtration system for single-walled carbon nanotubes

Abstract

The utility model discloses a kind of cleaning filtration systems of single-wall carbon nanotube, including pickling reactor, filter separation device, deionized water storage tank and hot air supply device, pickling reactor bottom is connected with reactor effluent pipe, filter separation device includes box and filter cartridge element, filter cartridge element is installed in box, reactor effluent pipe pipeline is connected to the inside of filter cartridge element, box is connected with separated liquid external discharge interface, deionized water storage tank pipeline connects pickling reactor, hot air supply device pipeline connects box, the utility model layout is reasonable, the single-wall carbon nanotube product of initial preparation is sequentially washed with acid, washed with deionized water and dried operation, finally obtain dry high-purity single-wall carbon nanotube powder product, the utility model can satisfy the efficient cleaning filtration operation demand of single-wall carbon nanotube product, the single-wall carbon nanotube powder product formed can also be conveniently collected and taken.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon nanotube production equipment, and more specifically, to a cleaning and filtration system for single-walled carbon nanotubes. Background Technology

[0002] Single-walled carbon nanotubes (SWNTs) are composed entirely of carbon atoms, and their geometry can be considered as a single layer of graphene rolled up. SWNTs possess excellent electronic, mechanical, and other properties, and have potential applications in various fields such as high-mobility transistors, logic circuits, conductive thin films, field emission sources, infrared emitters, sensors, scanning probe tips, mechanical strength enhancement, solar cells, and catalyst supports. Common methods for preparing SWNTs include arc discharge, laser evaporation, and chemical vapor deposition. However, the resulting SWNT products often contain foreign matter such as graphite fragments, amorphous carbon, and catalyst residues. This necessitates a cleaning and filtration process (also known as purification) for the prepared SWNTs. This design addresses the cleaning and filtration requirements for SWNT products. Utility Model Content

[0003] The purpose of this invention is to address the needs of the prior art by providing a cleaning and filtration system for single-walled carbon nanotubes. This invention features a rational layout: the single-walled carbon nanotubes are first acid-washed in an acid-washing reactor to remove catalyst residue; the acid-washed liquid is then fed into a filtration and separation device for separation; deionized water is then introduced to sequentially clean the single-walled carbon nanotubes in the reactor and filter elements; the cleaned carbon nanotubes are then dried with hot air to obtain a dry, high-purity single-walled carbon nanotube powder. This invention meets the requirements for efficient cleaning and filtration of single-walled carbon nanotubes, and the resulting powder can be easily collected and handled.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A cleaning and filtration system for single-walled carbon nanotubes includes an acid washing reactor, a filtration and separation device, a deionized water storage tank, and a hot air supply device. The bottom of the acid washing reactor is connected to a reactor outlet pipe, and the top of the acid washing reactor is connected to a material inlet and an acid inlet. The filtration and separation device includes a box and a filter cartridge element. The filter cartridge element is installed inside the box. The reactor outlet pipe is connected to the inside of the filter cartridge element. The box is connected to a separation liquid discharge port. The deionized water storage tank is connected to the acid washing reactor. The hot air supply device is connected to the box.

[0006] Furthermore, the pickling reactor is equipped with a stirring mechanism, and an exhaust pipe interface is connected to the top side wall of the pickling reactor.

[0007] Furthermore, the box is a cuboid with an internal cavity, and several filter elements are arranged in a straight line within the cavity, with the filter elements arranged along the length of the box.

[0008] Furthermore, several lower positioning seats are installed at the bottom of the inner side of the cavity, the number of which corresponds to the number of filter cartridge elements. A box cover is bolted to the top of the box, and several upper positioning seats are fixedly installed on the lower end face of the box cover, the number of which also corresponds to the number of filter cartridge elements. The filter cartridge element includes an upper cylinder and a lower cylinder, and a mesh is fixedly installed between the upper cylinder and the lower cylinder. The lower cylinder is adapted to be inserted into the lower positioning seat, and the installation of the box cover allows the upper cylinder to be adapted to be inserted into the upper positioning seat.

[0009] Furthermore, a number of protrusions are installed on the bottom inner side of the cavity, the number of protrusions corresponding to the number of lower positioning seats, and the lower positioning seats are fixedly installed on the top surface of the protrusions.

[0010] Furthermore, a piping element is installed on the upper surface of the box. The piping element includes a main pipe and branch pipes. One end of the main pipe is connected to the liquid outlet pipe of the reactor, and the other end of the main pipe branches and connects to all the branch pipes. The number of branch pipes corresponds to the number of filter cartridge elements. The installation of the box cover allows the bottom end of the branch pipe to be inserted into the filter cartridge element from top to bottom. A main control valve is installed on the main pipe, and each branch pipe is equipped with a sub-control valve.

[0011] Furthermore, an air inlet is connected to one end face of the box along its length, and an exhaust pipe is connected to the other end face of the box along its length. The air inlet pipe is connected to a hot air supply device.

[0012] Furthermore, two air duct partitions are symmetrically installed inside the box. The two air duct partitions are installed vertically and arranged along the length of the box. An air duct is formed between the two air duct partitions. The air duct includes a straight section and a flared opening. The flared opening is connected to the air inlet. The filter elements are all arranged in the straight section.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model has a reasonable layout. The single-walled carbon nanotube product is first acid-washed in an acid washing reactor to remove catalyst residue. The acid-washed liquid is then fed into a filtration and separation device for filtration and separation. Deionized water is then introduced to sequentially clean the single-walled carbon nanotube product in the reactor and filter element. The cleaned carbon nanotube product is then dried with hot air to finally obtain a dry, high-purity single-walled carbon nanotube powder product.

[0015] 2. The filter element of this utility model is easy to install and disassemble. The filter element adopts an inside-out filtration mode. The filtered single-walled carbon nanotube product remains inside the filter element. After production is completed, the single-walled carbon nanotube powder product can be quickly removed by simply removing the filter element. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural principle of a cleaning and filtration system for single-walled carbon nanotubes in this embodiment;

[0017] Figure 2 This is a schematic diagram of the internal structure of the filtration and separation device in this embodiment;

[0018] Figure 3 This is a cross-sectional view of the filter element in this embodiment;

[0019] Figure 4 This is a top view of the air duct layout in this embodiment.

[0020] Figure reference numerals: 1. Pickling reactor; 11. Reactor outlet pipe; 12. Material inlet; 13. Acid inlet; 14. Stirring mechanism; 15. Exhaust pipe interface; 2. Filtration and separation device; 21. Box; 211. Cavity; 212. Separated liquid discharge interface; 213. Plug; 214. Lower positioning seat; 215. Air inlet; 216. Air duct baffle; 217. Air duct; 218. Straight air section; 2181. Trumpet mouth; 2182. Filter element; 22. Upper cylinder; 221. Lower cylinder; 222. Mesh surface; 223. Box cover; 23. Upper positioning seat; 231. Pipe element; 24. Main pipe; 241. Branch pipe; 242. Main control valve; 243. Sub-control valve; 244. Deionized water storage tank; 3. Hot air supply device; 4. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1-4The system described herein is a cleaning and filtration system for single-walled carbon nanotubes, comprising an acid washing reactor 1, a filtration and separation device 2, a deionized water storage tank 3, and a hot air supply device 4. The acid washing reactor 1 is used for acid washing of the single-walled carbon nanotube products. The initially produced single-walled carbon nanotube products have low purity, and catalyst particle residue is a major impurity. Since metal catalysts are used in the production of single-walled carbon nanotubes, an acidic solution is used to react and wash away the catalyst particle residue in the single-walled carbon nanotube products. In this invention, a reactor outlet pipe 11 is connected to the bottom of the acid washing reactor 1, and the acid-washed liquid is discharged through the reactor outlet pipe 11. The top of the acid washing reactor 1 is connected to a material inlet 12 and an acid inlet 13, through which the initially produced single-walled carbon nanotubes are added. The nanotube product is treated with an acidic cleaning solution added through acid inlet 13. The solution mixes within the acid washing reactor 1 to achieve reactive cleaning. To improve the quality of acid washing, this invention includes a stirring mechanism 14 installed in the acid washing reactor 1. The stirring motion significantly improves the efficiency and quality of acid washing. The stirring mechanism 14 is a common existing device, and its structure will not be described in detail. This invention also includes an exhaust pipe interface 15 connected to the top side wall of the acid washing reactor 1 to discharge the waste gas generated during acid washing. This waste gas needs to be sent to a dedicated gas treatment device, which is irrelevant to this solution and will not be described here. During the acid washing process, the reactor outlet pipe 11 remains closed. After acid washing, the catalyst particles remain dissolved in the liquid and can be separated by filtration. For product purification, the filtration and separation device 2 of this utility model includes a box 21 and a filter element 22. The filter element 22 is installed inside the box 21, and the liquid outlet pipe 11 of the reaction vessel is connected to the inside of the filter element 22. That is to say, the acid-washed liquid discharged first enters the inside of the filter element 22, thus forming a filtration effect from the inside out. The box 21 is connected to a separation liquid discharge port 212. The acidic liquid seeps out of the filter element 22 and is discharged through the separation liquid discharge port 212 (the discharged liquid also needs to be treated separately with special equipment), while the single-walled carbon nanotube product is retained inside the filter element 22. The above steps only complete the removal of catalyst particle residue. The single-walled carbon nanotube product will still contain impurities such as graphite particle fragments and amorphous carbon. In comparison, this utility model... A newly designed deionized water storage tank 3 is connected to the pickling reactor 1 via piping. The deionized water storage tank 3 contains deionized water, which has strong dissolving power and can be used for secondary cleaning. First, deionized water is added to the pickling reactor 1 to clean its inner wall, reducing the residue of single-walled carbon nanotubes (increasing product yield). During the cleaning process, the reactor outlet pipe 11 is used. After the pickling reactor 1 is cleaned, deionized water is piped into the filter element 22 to further rinse the single-walled carbon nanotubes within the filter element 22. This process removes impurities by dissolving and carrying them away. The deionized water rinsing is typically performed three times. After three deionized water rinsings...The purity of the single-walled carbon nanotube (SUV) product meets production requirements, but it contains a large amount of moisture. Therefore, this invention designs a hot air supply device 4 connected to the housing 21. After rinsing with deionized water, the hot air supply device 4 provides hot air for drying. The hot air dries the SUV product inside the filter element 22, ultimately obtaining a dried SUV powder product. Since the SUV powder product is inside the filter element 22, it can be easily retrieved by simply removing the filter element 22. This invention offers convenient product retrieval.

[0023] like Figure 1 and Figure 2 As shown, the box 21 of this utility model is designed as a cuboid. The box 21 has a cavity 211 inside. The cavity 211 serves as a closed environment for filtration and drying operations. To improve the filtration and separation efficiency, multiple filter cartridge elements 22 are provided. Several filter cartridge elements 22 are arranged in a straight line and installed in the cavity 211. The filter cartridge elements 22 are arranged along the length of the box 21.

[0024] This utility model features a special mounting structure for the filter cartridge element 22 to facilitate the overall assembly and disassembly of the filter cartridge element 22, such as... Figure 2 As shown, several lower positioning seats 214 are installed at the bottom of the inner side of the cavity 211. The number of lower positioning seats 214 corresponds to the number of filter cartridge elements 22. A box cover 23 is bolted to the top of the box 21. The bolt connection facilitates the disassembly and assembly of the box 21. Several upper positioning seats 231 are fixedly installed on the lower end face of the box cover 23. The number of upper positioning seats 231 also corresponds to the number of filter cartridge elements 22. Figure 3 As shown, the filter cartridge element 22 includes an upper cylinder 221 and a lower cylinder 222. A mesh surface 223 is fixedly installed between the upper cylinder 221 and the lower cylinder 222. The mesh surface 223 is made of nanoscale material to meet the filtration and separation requirements. When installing the filter cartridge element 22, the lower cylinder 222 is first fitted into the lower positioning seat 214. After the cover 23 is installed, the upper cylinder 221 is fitted into the upper positioning seat 231. In this way, the upper positioning seat 231 and the lower positioning seat 214 precisely position and clamp the filter cartridge element 22, so that the filter cartridge element 22 is positioned and installed. When disassembly is required, simply remove the cover 23 first, and then pull out all the filter cartridge elements 22 one by one. The above structural design makes the filter cartridge element 22 easy to disassemble and reliably installed. Figure 2As shown, this utility model has several protrusions 213 installed at the bottom of the inner side of the cavity 211. The number of protrusions 213 corresponds to the number of lower positioning seats 214. The lower positioning seats 214 are fixedly installed on the top surface of the protrusions 213. The protrusions 213 raise the installation height of the filter element 22, so that the filtrate seeping from the filter element 22 flows smoothly to the bottom of the box 21 and is discharged smoothly from the separation liquid discharge port 212. During the filtration operation, the separation liquid discharge port 212 needs to be kept open for discharge.

[0025] To accommodate the installation design of multiple filter cartridge elements 22, such as Figure 2 As shown, a piping element 24 is installed on the upper surface of the box 21. The piping element 24 includes a main pipe 241 and branch pipes 242. One end of the main pipe 241 is connected to the liquid outlet pipe 11 of the reactor, and the other end of the main pipe 241 branches and connects to all the branch pipes 242. The number of branch pipes 242 corresponds to the number of filter cartridge elements 22. The bottom end of the branch pipes 242 passes through the box cover 23 and has a portion of extra length. The installation of the box cover 23 allows the bottom end of the branch pipes 242 to be inserted into the filter cartridge elements 22 from top to bottom. The main pipe 241 receives the liquid from the acid washing reactor and then distributes the liquid to all the branch pipes 242, thus entering all the filter cartridge elements 22. After completing the filtration and separation operation, a main control valve 243 is installed on the main pipeline 241. The main control valve 243 controls the opening and closing of the main pipeline 241. The main control valve 243 is only opened when there is liquid to enter the filtration and separation device 2. Each branch pipeline 242 is equipped with a sub-control valve 244. The sub-control valve 244 controls the opening and closing of the branch pipeline 242. The sub-control valve 244 must be opened when there is liquid to enter the filtration and separation device 2. The sub-control valve 244 is installed close to the filter element 22. During the drying operation, the sub-control valve 244 must be closed to prevent hot air from entering the pipeline element 24 along the top of the filter element 22. The close installation can minimize the impact of hot air on the pipeline.

[0026] like Figure 2 As shown, an air inlet 215 is connected to one end face along the length of the box 21, and an exhaust 216 is connected to the other end face along the length of the box 21. The air inlet 215 is connected to a hot air supply device 4, which continuously supplies hot air for drying into the cavity 211. The exhaust 216 is connected to a waste air treatment device, which specifically treats the drying air. To improve drying efficiency and quality, such as... Figure 4As shown, this utility model has two symmetrically installed air duct partitions 217 inside the box 21. The two air duct partitions 217 are installed vertically and arranged along the length of the box 21. An air duct 218 is formed between the two air duct partitions 217. The air duct 218 includes a straight air section 2181 and a flared mouth 2182. The flared mouth 2182 is connected to the air inlet 215. The filter elements 22 are all arranged in the straight air section 2181. The drying air first enters the flared mouth 2182 and then enters the straight air section 2181. Since the cross-section of the straight air section 2181 of the air duct 218 is smaller, the wind speed of the straight air section 2181 is increased, which is conducive to rapid evaporation and removal of moisture, thereby improving drying efficiency and quality.

[0027] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A cleaning and filtration system for single-walled carbon nanotubes, characterized in that, The system includes an acid pickling reactor (1), a filtration and separation device (2), a deionized water storage tank (3), and a hot air supply device (4). The bottom of the acid pickling reactor (1) is connected to a reactor outlet pipe (11), and the top of the acid pickling reactor (1) is connected to a material inlet (12) and an acid inlet (13). The filtration and separation device (2) includes a box (21) and filter elements (22). The filter elements (22) are installed inside the box (21). The reactor outlet pipe (11) is connected to the inside of the filter elements (22). The box (21) is connected to a separation liquid discharge port (212). The deionized water storage tank (3) is connected to the acid pickling reactor (1). The hot air supply device (4) is connected to the box (21). The box (21) is a cuboid, and the box (21) has a cavity (211) inside. Several filter elements (22) are arranged along a... The filter cartridge elements (22) are arranged in a straight line within the cavity (211) along the length of the box (21). Several lower positioning seats (214) are installed at the bottom inner side of the cavity (211), the number of which corresponds to the number of filter cartridge elements (22). A box cover (23) is bolted to the top of the box (21), and several upper positioning seats (231) are fixedly installed on the lower end face of the box cover (23). The number of upper positioning seats (231) also corresponds to the number of filter cartridge elements (22). The filter cartridge element (22) includes an upper cylinder (221) and a lower cylinder (222). A mesh surface (223) is fixedly installed between the upper cylinder (221) and the lower cylinder (222). The lower cylinder (222) is adapted to be inserted into the lower positioning seat (214). The installation of the box cover (23) makes the upper cylinder (221) adapted to be inserted into the upper positioning seat (231).

2. The cleaning and filtration system for single-walled carbon nanotubes according to claim 1, characterized in that, The pickling reactor (1) is equipped with a stirring mechanism (14), and the top side wall of the pickling reactor (1) is connected to an exhaust pipe interface (15).

3. The cleaning and filtration system for single-walled carbon nanotubes according to claim 1, characterized in that, A number of protrusions (213) are installed on the bottom inner side of the cavity (211). The number of protrusions (213) corresponds to the number of lower positioning seats (214). The lower positioning seats (214) are fixedly installed on the top surface of the protrusions (213).

4. The cleaning and filtration system for single-walled carbon nanotubes according to claim 1, characterized in that, The upper surface of the box (21) is equipped with a pipe element (24), which includes a main pipe (241) and branch pipes (242). One end of the main pipe (241) is connected to the liquid outlet pipe (11) of the reactor. The other end of the main pipe (241) branches and connects to all the branch pipes (242). The number of branch pipes (242) corresponds to the number of filter cartridge elements (22). The installation of the box cover (23) allows the bottom end of the branch pipe (242) to be inserted into the filter cartridge element (22) from top to bottom. A main control valve (243) is installed on the main pipe (241), and each branch pipe (242) is equipped with a sub-control valve (244).

5. The cleaning and filtration system for single-walled carbon nanotubes according to claim 1, characterized in that, The box (21) has an air inlet (215) connected to one end face along its length, and an exhaust pipe (216) connected to the other end face along its length. The air inlet (215) is connected to a hot air supply device (4).

6. The cleaning and filtration system for single-walled carbon nanotubes according to claim 5, characterized in that, Two air duct partitions (217) are symmetrically installed inside the box (21). The two air duct partitions (217) are installed vertically and arranged along the length of the box (21). An air duct (218) is formed between the two air duct partitions (217). The air duct (218) includes a straight section (2181) and a flared mouth (2182). The flared mouth (2182) is connected to the air inlet (215). The filter elements (22) are all arranged inside the straight section (2181).

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