KR-20260066071-A - Method for manufacturing carbon materials

Abstract

The objective of the present invention is to provide a manufacturing method that can contribute to CO2 reduction and reduce manufacturing costs, etc., by using a carbon material produced from plant-based raw materials. The present invention relates to a method for manufacturing a carbon material characterized by comprising: a washing process in which a plant-based raw material is immersed in an aqueous solution and washed by stirring; a dehydration process in which, after the washing process, the plant-based raw material is placed in a container and rotated by a rotary dehydration device to dehydrate the moisture contained in the plant-based raw material; and a calcination process in which, after the dehydration process, the plant-based raw material is calcined in a wet state without drying.

Inventors

• 기노시타 다카히로

Assignees

• 지칸 테크노 가부시키가이샤
• 기노시타 다카히로

Dates

Publication Date

20260512

Application Date

20240826

Priority Date

20230908

Claims (5)

1. A washing process in which plant-based raw materials are immersed in an aqueous solution and washed by stirring, and A dehydration process in which the plant raw material is placed in a container after the washing process and rotated by a rotary dehydration device to dehydrate the moisture contained in the plant raw material, and A calcination process in which the above plant raw material is calcined in a wet state without drying after the above dehydration process. A method for manufacturing a carbon material characterized by including
2. In Article 1, A method for manufacturing a carbon material characterized in that the rotational speed of the dehydration device is 300 rpm to 3000 rpm.
3. In Article 1, A method for manufacturing a carbon material comprising a carbon material having a powder resistance of 1.0 × 10⁻³ Ω·cm to 3.8 × 10⁻² Ω·cm.
4. A method for manufacturing a carbon material characterized by using wheat and barley husks, cocoa shells, or sake lees as plant-based raw materials, and burning the carbon material at a temperature of 1000 ℃ to 1500 ℃ in an oxygen-free state, wherein the carbon material has a specific surface area of 15 m² /g to 80 m² /g.
5. A carbonization process for carbonizing plant-based raw materials, and A acid cleaning process in which the carbonized material is acid-cleaned with an acid solution after the above carbonization process, and, An alkaline aqueous solution immersion process in which the carbide is immersed in an alkaline aqueous solution after the acid washing process, and A dehydration process for storing the above carbonized material in a container and rotating it by a rotary dehydration device to dehydrate the moisture contained in the above plant raw material, and A calcination process in which the above plant raw material is calcined in a wet state without drying after the above dehydration process. A method for manufacturing a carbon material characterized by including

Description

Method for manufacturing carbon materials The present invention relates to a method for manufacturing carbon materials, such as graphene, from plant-based raw materials. From the perspective of carbon neutrality, plant-based raw materials have been used for battery materials, conductive materials, heating elements, tires, and construction materials. In particular, carbon materials with a large specific surface area have been used as materials for batteries and capacitors. Additionally, carbon materials with excellent electrical conductivity have been widely used as heating materials or shielding materials. As such, various inventions have been proposed as methods for manufacturing carbon materials from plant-based raw materials. For example, Patent Document 1 describes a method for manufacturing a carbon material, wherein, in obtaining activated carbon or activated carbon fiber having a high specific surface area by reactivating a carbonaceous raw material with an alkali metal compound, the reaction system (a composition comprising a carbonaceous raw material and an alkali metal compound) is surrounded by a carbonaceous powder layer, and furthermore, if necessary, an inorganic compound layer is included in the carbonaceous powder layer during reactivation. Additionally, a method for manufacturing a carbon material that increases the yield of carbon material per container by setting the heating rate during reactivation to 20 ℃/hr or less. An electric double layer capacitor using the activated carbon or activated carbon fiber obtained by the manufacturing method as an electrode material. For example, Patent Document 2 discloses an invention comprising a pretreatment process (S1) for obtaining a carbon source by drying and grinding a plant-based raw material, a carbonization process (S2) for obtaining a carbonized product by carbonizing the carbon source, and a purification process (S3) for removing impurities including silica from the carbonized product obtained in the carbonization process, wherein the carbonization process comprises a heating process in which an inert gas is supplied into a chamber and the carbon source in the chamber is heated in a plasma atmosphere. Figure 1 is the Raman spectrum of graphene of an embodiment. Figure 2 is the Raman spectrum of the carbide of the embodiment. FIG. 3 is a schematic diagram showing the configuration of a heating element coated with a heating paint of an embodiment. Figure 4 is a schematic diagram showing the temperature characteristics of a heating element of an embodiment. Figure 5 is a schematic diagram showing the temperature characteristics of a heating element of an embodiment. FIG. 6 is a schematic diagram showing the configuration of a plasma device of an embodiment. FIG. 7 is a diagram showing a process flow representing a manufacturing process for producing a carbon material of an embodiment. FIG. 8 is a diagram showing a process flow representing a manufacturing process for producing a carbon material of an embodiment. FIG. 9 is a conceptual diagram of another example of the neutralization treatment of the embodiment. FIG. 10 is a conceptual diagram of another example of a device used for neutralization treatment of an embodiment. FIG. 11 is a diagram showing a process flow representing a manufacturing process for producing a carbon material of an embodiment. FIG. 12 is a schematic diagram showing the configuration of another example of a heating element coated with the heating paint of the embodiment. FIG. 13 is a schematic diagram showing the configuration of another example of a heating element coated with the heating paint of the embodiment. FIG. 14 is a diagram showing a process flow representing a manufacturing process for producing a carbon material of an embodiment. The heat-generating paint related to the present invention will be described in detail with reference to the drawings. Furthermore, the embodiments and drawings described below are intended to illustrate parts of the embodiments of the present invention and are not intended to be limited to these configurations; they may be appropriately modified within the scope of not departing from the essence of the present invention. <Biomass Materials> The present invention describes a plant-based raw material (9) for manufacturing graphene. The present invention manufactures graphene, which is the final product, using food residue or discarded plant-based raw material (9). The plant-based raw material (9) may be plants or wood, but in particular, if discarded plant-based raw material (9), such as residue from harvesting plants, is used as a raw material for manufacturing graphene, it is possible to obtain the raw material at a low cost. Table 1 is a composition table of plant-based raw materials (9). Table 1 shows the proportion of the components constituting the raw materials shown on the far left as percentages on the right below. For example, rice straw contains 37.4% carbon (C), 0.53% n