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KR-20260063116-A - MANUFACTURING METHOD OF POROUS ACTIVATED CARBON USING OXIDATION STABILIZATION CATALYST

KR20260063116AKR 20260063116 AKR20260063116 AKR 20260063116AKR-20260063116-A

Abstract

A method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst is disclosed, which can expect effects such as shortening the oxidation-stabilizing time, minimizing clumping between petroleum residue pitch powder particles, and improving process efficiency by using zeolite as an oxidation-stabilizing catalyst. A method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst according to the present invention comprises the steps of: mixing petroleum residue pitch and an oxidation-stabilizing catalyst in a solvent, maintaining stirring under conditions above the softening point of the petroleum residue pitch, and then drying; treating the powder mixed with the petroleum residue pitch and the oxidation-stabilizing catalyst for oxidation stabilization; treating the oxidation-stabilized petroleum residue pitch powder for activation under conditions of 800 to 1,000°C while supplying steam and CO2 gas; and cooling the activated product to obtain porous activated carbon.

Inventors

  • 노광철
  • 임무성

Assignees

  • 한국세라믹기술원

Dates

Publication Date
20260507
Application Date
20241030

Claims (15)

  1. A step of mixing petroleum residue pitch and an oxidation stabilization catalyst in a solvent, maintaining stirring under conditions above the softening point of the petroleum residue pitch, and then drying; A step of oxidatively stabilizing the powder mixed with the above-mentioned petroleum residue pitch and oxidation stabilization catalyst; A step of activating the above oxidation-stabilized petroleum residue pitch powder under conditions of 800 to 1,000°C while supplying steam and CO2 gas; and A step of cooling the above-mentioned activated product to obtain porous activated carbon; Characterized by including, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  2. In paragraph 1, The above petroleum residue pitch is Characterized as pitch derived from residual oil inevitably generated in the petrochemical industry, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  3. In paragraph 2, The above petroleum residue pitch is Characterized by using a softening point of 150 to 250℃, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  4. In paragraph 1, The above oxidation stabilization catalyst Characterized by adding 5 to 20 parts by weight to 100 parts by weight of the above petroleum residue pitch, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  5. In paragraph 1, The above oxidation stabilization catalyst Characterized as being a zeolite, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  6. In paragraph 1, The above drying is Characterized by being carried out at 70 to 90℃ for 4 to 8 hours, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  7. In paragraph 1, The above oxidation stabilization treatment is Characterized by heating to 200 to 350℃ at a rate of 3 to 10℃/min, maintaining at 200 to 350℃ for 30 to 90 minutes, and then cooling at a rate of 3 to 10℃/min. Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  8. In Paragraph 7, The above oxidation stabilization treatment is Characterized by being performed at 250 to 300℃ for 40 to 70 minutes, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  9. In paragraph 1, Between the above oxidation stabilization treatment step and the activation treatment step, A step of carbonizing the above oxidation-stabilized petroleum pitch under conditions of 400 to 700°C; Characterized by further including, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  10. In Paragraph 9, The above carbonization treatment Characterized by heating to 400 to 700℃ at a rate of 3 to 10℃/min, maintaining at 400 to 700℃ for 30 to 90 minutes, and then cooling at a rate of 3 to 10℃/min. Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  11. In paragraph 1, The above activation process is Characterized by being carried out in an inert atmosphere supplied with an inert gas comprising one or more of Ar, He, and N2 , Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  12. In paragraph 1, The above activation process is Characterized by raising the temperature to 800 to 1,000℃ at a rate of 5 to 10℃/min, and then performing the process at 800 to 1,000℃ for 1 to 30 minutes. Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  13. In paragraph 1, When the above activation process, Each of the above CO2 gas and water vapor is Characterized by supplying at a flow rate of 100 to 500 cc/min, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  14. In paragraph 1, The above cooling is Characterized by being carried out at a rate of 5 to 10℃/min, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.
  15. In paragraph 1, The above porous activated carbon is Characterized by having a specific surface area of 1,000 to 3,000 m²/g, Method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst.

Description

Manufacturing Method of Porous Activated Carbon Using Oxidation Stabilization Catalyst The present invention relates to a method for manufacturing porous activated carbon using an oxidation stabilization catalyst, and more specifically, to a method for manufacturing porous activated carbon using an oxidation stabilization catalyst that can expect effects such as shortening the oxidation stabilization time, minimizing clumping between petroleum residue pitch powder particles, and improving process efficiency by using zeolite as the oxidation stabilization catalyst. Generally, cutting fluid is a lubricant used to cool and lubricate the cutting tool parts when machining metal materials, in order to extend the tool's life or clean the finished surface. In the automotive and steel industries, contaminated cutting fluid is inevitably discharged regularly due to factors such as changes in the properties of the cutting fluid and spoilage. Waste cutting fluid maintains a high-concentration emulsion state (90 to 95 wt% water and 5 to 10 wt% cutting fluid) that mixes very well with water, and this high-concentration wastewater in an emulsion state is entirely entrusted to external wastewater or waste treatment companies for disposal. The cost of outsourcing waste cutting fluid disposal per ton is approximately 150,000 to 200,000 won, and this poses an economic and environmental burden on companies as it increases production costs. In order to improve the waste cutting fluid treatment process or treatment efficiency, it is necessary to recycle water and reduce discharge using oil-water separation filters, floating oil adsorbents, and activated carbon adsorption. Activated carbon manufactured using petroleum residue-based pitch as a raw material offers excellent price competitiveness and possesses superior physical properties compared to commercially available activated carbon. Furthermore, pitch has the advantage of being able to be molded into various shapes due to its characteristic of softening above a certain temperature, and its pore characteristics can also be controlled by adjusting its molecular weight. General physical properties required for pitch used in the manufacture of porous adsorption materials include high pitch production yield, coking value, excellent activation yield, and a softening point suitable for the molding process. In particular, when manufacturing activated carbon for water treatment, additional properties such as specific surface area, mesopores, iodine adsorption capacity, and molded body hardness are required in addition to the basic properties of the pitch. Generally, porous materials are materials composed of pores making up about 15 to 95% of their volume, and they possess or can impart new properties that conventional materials do not have. A representative porous adsorption material is activated carbon. Activated carbon is an aggregate of amorphous carbon with well-developed micropores; during the activation process, micropores of molecular size are well formed, resulting in a large internal surface area. Furthermore, activated carbon has the property of adsorbing molecules of the adsorbate by exerting attractive forces on surrounding liquids or gases through the functional groups of carbon atoms present on its surface. Therefore, based on its excellent adsorption properties, activated carbon is primarily used as an adsorbent in various fields such as air purification, water purification, cleaning, removal of odors or toxic gases, gas separation, and solvent recovery. As the excellent adsorption capacity of activated carbon becomes known, the demand for special-functional activated carbon is steadily increasing across industry and daily life. Furthermore, due to stricter environmental regulations, there is a demand for the development of activated carbon with high efficiency and a long lifespan. Coconut shell-based materials are the most widely used raw material for activated carbon; however, due to high import dependency, these materials are heavily influenced by the global economic market and experience significant price fluctuations. Furthermore, the emergence of inexpensive Chinese products is causing domestic activated carbon to lose its price competitiveness. Therefore, there is a need to develop manufacturing technologies for activated carbon utilizing domestically produced raw materials. A relevant prior art document is Korean Patent Publication No. 10-2002-0051383 (published June 29, 2002), which describes an activated alumina composite activated carbon fiber and a method for manufacturing the same. FIG. 1 is a process flowchart showing a method for manufacturing porous activated carbon using an oxidation-stabilizing catalyst according to an embodiment of the present invention. Figure 2 is a schematic diagram showing an activation processing device. Figure 3 is a measured photograph showing petroleum-based residue pitch before and after oxidation stabilization treatment ac