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KR-102962849-B1 - Electrode paste Composition for SAF using sluge from fluid catalytic cracking process

KR102962849B1KR 102962849 B1KR102962849 B1KR 102962849B1KR-102962849-B1

Abstract

The present invention provides a method for separating asphaltene from petroleum-based heavy oil, comprising the steps of: preparing a solvent mixture by mixing petroleum-based heavy oil, which is a raw material for manufacturing needle coke, with a paraffinic solvent under atmospheric pressure and ambient temperature conditions; reacting the solvent mixture in a reactor under atmospheric pressure and a temperature of 60°C to 130°C to produce a reaction product; extracting the petroleum-based heavy oil and solvent mixture from the upper layer of the reaction product; and separating the asphaltene and solvent mixture from the lower layer and separating the solvent by distillation. According to the method, the thermal expansion coefficient of the needle coke produced from petroleum-based heavy oil can be lowered, thereby improving the quality of the needle coke produced.

Inventors

  • 김효창
  • 송재관
  • 이예빈
  • 최용철
  • 이성영
  • 조종훈
  • 고윤영

Assignees

  • 주식회사 포스코엠씨머티리얼즈

Dates

Publication Date
20260511
Application Date
20240624

Claims (5)

  1. As an electrode paste comprising an electrode paste additive, aggregate, and binder, The above electrode paste contains FCC sludge, which is a byproduct of the fluid catalytic cracking (FCC) process, and Having plasticity such that when heat-treated by raising the temperature to 150 to 200℃, the diameter increase rate before and after heat treatment is 14% to 16%, Electrode paste composition for SAF.
  2. In paragraph 1, The above aggregate is characterized by comprising coal-based coke, dust collector powder, or fine dust collector powder, in an electrode paste composition for SAF.
  3. In paragraph 1, The above FCC sludge is characterized by including a byproduct generated during the process of separating asphaltene from petroleum-based heavy oil, in an electrode paste composition for SAF.
  4. In paragraph 1, The above FCC sludge is, A step of preparing a solvent mixture by mixing petroleum-based heavy oil, which is a raw material for manufacturing needle coke, with a paraffinic solvent under atmospheric pressure and room temperature conditions; A reaction step of reacting the above solvent mixture in a reactor under atmospheric pressure and a temperature of 60°C to 130°C to produce a reactant; After the above reaction step, a layer of petroleum-based heavy oil and solvent mixture is formed in the upper part of the reactor and a mixture of asphaltene and solvent is formed in the lower part of the reactor, thereby causing layer separation, and an extraction step of extracting the petroleum-based heavy oil and solvent mixture from the upper part; and A SAF electrode material paste composition characterized by including asphaltene separated by a solvent separation step in which an asphaltene and solvent mixture is separated from the lower layer and the solvent is separated by distillation.
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Description

Electrode paste composition for SAF using sludge from fluid catalytic cracking process The present invention relates to a technology in the field of electrode paste manufacturing, specifically to a technology for manufacturing electrode materials for a Submerged Arc Furnace (SAF). Electrode paste is a semi-finished product formed by hot mixing of aggregate and binder (pitch), and is used as an electrode material for a Submerged Arc Furnace (SAF). The electrode paste is heated and melted inside the SAF furnace and filled by its own weight; at this time, it must have an appropriate degree of softening to form an ideal electrode without aggregate segregation and pores. The appropriate degree of softening can be measured by evaluating plasticity, and to control this degree of softening, additives are added in addition to the binder to enhance the binding effect. However, these additives act as a factor that increases the manufacturing cost of electrode materials. Tar and anthracene oil have been used as additives in existing electrode pastes, but in order to improve process efficiency and economic feasibility, it is necessary to seek recycled raw materials that can replace the above additives. FIG. 1 is a flowchart conceptually illustrating a method for separating asphaltene as FCC sludge according to one embodiment of the present invention. Figure 2 is a conceptual diagram showing the change in diameter of the electrode paste before and after heat treatment to analyze plasticity characteristics. Hereinafter, an electrode paste composition for SAF according to an embodiment of the present invention will be described in detail with reference to the attached drawings. The following descriptions are exemplary descriptions intended to explain the embodied aspects of the technical concept of the present invention, and the technical concept of the present invention is not limited by the following descriptions. The technical concept of the present invention may be interpreted and limited only by the claims set forth below. Meanwhile, conventional headings such as "Examples" are excluded, and contents corresponding to "Examples" are appropriately included in the explanation without a special format to promote a thorough understanding of the invention. The electrode paste composition for SAF of this embodiment comprises aggregate, additives, and a binder (pitch). In this embodiment, by including coal-based coke, dust collector powder, or fine dust collector powder as the aggregate, high strength can be secured compared to electrode paste using anthracite as the aggregate. The aggregate components may be used alone or in combination of two or more. Meanwhile, the above binder may be a coal-based material, and various commercially available products may be used as binders considering the physical properties of the electrode material. As the above additive, byproduct sludge generated during the fluid catalytic cracking (FCC) process is used. In particular, in this embodiment, sludge that is a byproduct generated during the process of separating asphaltene from petroleum-based heavy oil may be used, and said sludge contains asphaltene. Below, a method for separating asphaltene as the above FCC sludge will be described. FIG. 1 is a flowchart conceptually illustrating a method for separating asphaltene from petroleum-based heavy oil according to one embodiment of the present invention. Referring to FIG. 1, a method (S100) for separating asphaltene from petroleum-based heavy oil includes a solvent mixture preparation step (S110), a reaction step (S120), a petroleum-based heavy oil extraction step (S130), an asphaltene solvent mixture separation step (S140), and a distillation step (S150). The above method (S100) may be a process of a method for manufacturing needle coke from petroleum-based heavy oil, and is a method that improves the quality and stability of needle coke by reducing the coefficient of thermal expansion of the needle coke produced by effectively separating asphaltenes in petroleum-based heavy oil. That is, the FCC sludge of the present invention may be a byproduct during the needle coke manufacturing process. To perform the above method (S100), first, a solvent mixture preparation step (S110) is performed in which petroleum-based heavy oil is prepared and the petroleum-based heavy oil is mixed with a solvent to prepare a solvent mixture. As the above solvent, a paraffinic solvent is used, and in particular, using a compound with a normal structure having 5 to 8 carbon atoms is very advantageous in terms of miscibility with asphaltene. The paraffinic solvent is used in an amount of 30 to 60 weight percent in the total solvent mixture. The proportion of the paraffinic solvent in the solvent mixture can be appropriately modified within the above range, taking into account the composition of the petroleum-based heavy oil. Meanwhile, since the mixing of petroleum-based heavy oil and the solvent is carried out under