KR20220105214A - Preparation of Impregnation Pitch - Google Patents

Abstract

The present invention relates to a method for producing impregnation pitch. More specifically, the method for producing impregnation pitch comprises the steps of: preparing a mixture by mixing a coal tar-based raw material and a solvent; separating a supernatant and a lower layer solution containing solid content from the mixture by centrifugation or decanting; recovering the solvent from the supernatant to obtain a residue; and performing a distillation process and a heat treatment process on the residue. The coal tar-based raw material includes at least one of coal tar, heavy tar, coal tar-based carbon black raw material oil, and coal tar pitch having a softening point of 10 to 90 ℃. The solvent includes 1 to 4 aromatic rings, which are substituted or unsubstituted, and an aromaticity index of the solvent is 0.7 to 1. In addition, a boiling point of the solvent is 100 to 350 ℃, and the content of quinoline and isoquinoline in the solvent is 0 to 5.0 wt% by total weight of the impregnation pitch. Moreover, a softening point of the impregnation pitch is 60 to 120 ℃. The content of the quinoline insoluble in the impregnation pitch is 0.0001 to 0.5 wt% by total weight of the impregnation pitch, and also the content of beta-resin in the impregnation pitch is 10 to 30 wt% by total weight of the impregnation pitch. Accordingly, it is possible to manufacture high quality impregnation pitch with a high carbonization yield.

Description

Method of manufacturing impregnation pitch {Preparation of Impregnation Pitch}

The present invention relates to a method for producing an impregnated pitch, and more particularly, the content of quinoline insoluble matter (QI) is significantly reduced, and the content of beta-resin in the impregnated pitch is 10 wt% or more relative to the total weight of the impregnated pitch, , relates to a method for producing a high-quality impregnated pitch having a softening point of 60 ℃ to 120 ℃ of impregnated pitch.

In general, carbon-fired products are produced into products such as graphite electrodes for steelmaking and graphite blocks through firing, graphitization, and processing processes using a binder pitch in coke as a binder. However, as volatile components of coke and binder pitch escape or are thermally decomposed in the process of heat treatment, pores are generated inside the carbon material, thereby reducing mechanical strength, bulk density, etc., and may increase electrical resistance.

The impregnation process is a process of increasing the bulk density of the carbon material by injecting a pitch into the pores and firing it, thereby solving the above-mentioned problems. At this time, the used impregnation pitch should have good pore penetration, and the amount of fixed carbon remaining after firing and graphitization should be high. Therefore, raw materials of pitch that can be used are limited, and coal tar pitch is generally used. However, coal tar pitch contains quinoline insoluble matter (QI), which inhibits the penetration of the pitch into the pores, so a process of removing some of it is required. There are methods for manufacturing an impregnated pitch by removing the quinoline insoluble matter, but an impregnated pitch containing a quinoline insoluble content in a very small amount is required for the manufacture of commercially high-quality carbon materials. In order to produce the impregnated pitch containing such a quinoline insoluble content in a very small amount, there are limitations in raw materials, and there are still problems to be solved, such as a solvent used and a separation method.

The problem to be solved by the present invention is the quinoline insoluble content (QI) from various coal tar-based raw materials including at least one of coal tar, coal tar-based carbon black oil, heavy tar, and coal tar pitch having a softening point of 10 to 90 ° C. An object of the present invention is to provide a method for producing a high-quality impregnated pitch with significantly reduced content.

According to the concept of the present invention, the manufacturing method of the impregnated pitch, a step of preparing a mixture by mixing a coal tar-based raw material and a solvent, a centrifugal separation method or a lower layer comprising a solid content from the mixture by a decanting (decanting) method Separating the liquid, recovering the solvent from the supernatant to obtain a residue, and performing a distillation process and a heat treatment process on the residue, wherein the coal tar-based raw material is coal tar, heavy tar, coal tar Carbon black raw material oil, and at least one of coal tar pitch having a softening point of 10 ° C to 90 ° C, wherein the solvent contains substituted or unsubstituted, 1 to 4 aromatic rings, and the aromatic index of the solvent is 0.7 to 1, the boiling point of the solvent is 100 ℃ to 350 ℃, the content of quinoline and isoquinoline in the solvent is 0 wt% to 5.0 wt% relative to the total weight of the impregnated pitch, the impregnated pitch The softening point is 60 ° C to 120 ° C, the content of quinoline insoluble in the impregnated pitch is 0.0001 wt % to 0.5 wt % relative to the total weight of the impregnated pitch, and the beta-resin content in the impregnated pitch is, the impregnation It may be 10 wt% to 30 wt% based on the total weight of the pitch.

The manufacturing method of the impregnated pitch according to the present invention, including coal tar pitch, which is commonly used as a raw material, as well as heavy tar containing a large amount of solid content, which is a waste remaining after refining coal tar, various coal tar-based raw materials can be used. , economical.

The softening point of the impregnated pitch, prepared according to the method for manufacturing the impregnated pitch of the present invention, is 60 ° C to 120 ° C, the content of quinoline insoluble in the impregnated pitch is 0.5 wt % or less, and the beta-resin content in the impregnated pitch is 10 It may be more than wt%. Accordingly, according to the present invention, it is possible to manufacture a high-quality impregnation pitch.

The manufacturing method of the impregnated pitch according to the present invention, compared to the conventional manufacturing method, the manufacturing process is simple and can be manufactured continuously, and the beta-resin recovery amount is high, so the impregnated pitch with high carbonization yield can be manufactured.

1 is a flowchart for explaining a method of manufacturing an impregnation pitch according to an embodiment of the present invention.
2 is a schematic process diagram for explaining a method of manufacturing an impregnation pitch according to an embodiment of the present invention.

In order to fully understand the configuration and effect of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various forms and various modifications may be made. However, it is provided so that the disclosure of the present invention is complete through the description of the present embodiments, and to fully inform those of ordinary skill in the art to which the present invention belongs, the scope of the invention.

In this specification, when a component is referred to as being on another component, it may be directly formed on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components is exaggerated for effective description of technical content. Parts indicated with like reference numerals throughout the specification indicate like elements.

In various embodiments of the present specification, terms such as first, second, third, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, 'comprises' and/or 'comprising' does not exclude the presence or addition of one or more other elements.

1 is a flowchart for explaining a method of manufacturing an impregnation pitch according to an embodiment of the present invention.

2 is a schematic process diagram for explaining a method of manufacturing an impregnation pitch according to an embodiment of the present invention.

1 and 2, the manufacturing method of the impregnated pitch according to an embodiment of the present invention, the step of preparing a mixture by mixing a coal tar-based raw material and a solvent (S1), centrifugation method or decanting (decanting) Separating the supernatant and the lower layer solution containing the solids from the mixture by the method (S2), recovering the solvent from the supernatant to obtain a residue (S3), and performing a distillation process and a heat treatment process on the residue It may include a step (S4) to.

The method of manufacturing an impregnated pitch according to an embodiment of the present invention may include a step (S1) of preparing a mixture by mixing a coal tar-based raw material and a solvent. The step (S1) of preparing a mixture by mixing the coal tar-based raw material and the solvent may be performed in a mixer. The coal tar-based raw material may include at least one of coal tar, coal tar-based carbon black oil, heavy tar, and coal tar pitch having a softening point of 10 to 90°C. The coal tar may be a material obtained when coal is carbonized at a high temperature. In the present specification, the heavy tar is a by-product remaining after refining coal tar for commercial use, and may refer to coal tar sludge containing various by-products and moisture in the form of sludge.

That is, according to the present invention, the impregnated pitch can be manufactured using various coal tar-based raw materials. In general, heavy tar is treated as waste, but according to the present invention, it can be used as a raw material for high-quality impregnated pitch.

The solvent may include a single aromatic compound or a mixed aromatic compound. Quinoline Insoluble (QI) may be removed from the coal tar-based raw material by the solvent. For example, the solvent may include 1 to 4 aromatic rings, substituted or unsubstituted, and the solvent may have an aromatic index of 0.7 to 1. In the present specification, the aromatic index may mean a numerical value calculated using a Brown-Ladner method.

On the other hand, for example, when petroleum-based kerosene containing many aliphatic components is used as a raw material, if a solvent having an aromatic index of less than 0.7 is used, the recovery efficiency of the tar component may be reduced. In addition, in order to use petroleum-based kerosene with many aliphatic components as a raw material, a relatively high temperature mixing condition of 150° C. or higher may be required. Therefore, in this case, in the step (S2) of separating the supernatant and the lower layer solution containing the solid content from the mixture by the subsequent centrifugation method or decanting method, only the layer separation occurs, and the recovery efficiency of the tar component is reduced may be lowered.

The solvent may include a single aromatic compound or a mixed aromatic compound. The boiling point of the solvent may be 100 ℃ to 350 ℃. On the other hand, if the boiling point of the solvent is less than 100 ° C, the odor and volatility are strong, which may be disadvantageous to the process operation, and if the boiling point of the solvent is more than 350 ° C. this may be lowered.

The content of quinoline and isoquinoline in the solvent may be 0.0001 wt% to 5.0 wt% based on the total weight of the impregnated pitch. However, even if the aromatic index of the solvent is 0.7 or more, when using a solvent in which the content of quinoline and isoquinoline in the aromatic solvent is 5.0 wt% or more relative to the total weight of the impregnated pitch, the tar component is well dissolved and the recovery rate is is increased, while the efficiency of removing impurities including quinoline insoluble matter (QI) may be reduced. For example, coal tar-based oil absorption oil having a boiling point of 240 ° C. to 310 ° C. may have a quinoline and isoquinoline content of about 10% based on the total weight of the impregnated pitch. While the recovery rate is increased by dissolving the components well, the efficiency of removing impurities including quinoline insoluble matter (QI) may be reduced.

In one embodiment of the present invention, the solvent may not contain quinoline and isoquinoline. That is, the content of quinoline and isoquinoline in the solvent may be 0 wt%. Meanwhile, as described above, the solvent of the present invention may contain quinoline and isoquinoline in a trace amount, and therefore, the content of quinoline and isoquinoline in the solvent of the present invention may be 0 wt% to 5.0 wt%.

For example, the weight ratio of the coal tar-based raw material and the solvent may be mixed in a range of 90:10 to 20:80. On the other hand, when the solvent is less than 10 parts by weight based on 100 parts by weight of the mixture, the recovery efficiency of the coal tar component may be reduced, and the content of the quinoline insoluble matter (QI) in the coal tar pitch may exceed 0.5 wt%. In addition, when the solvent is more than 80 parts by weight with respect to 100 parts by weight of the mixture, the recovery efficiency of the coal tar component may be improved, and the content of the quinoline insoluble matter (QI) may be maintained at 0.5 wt% or less, but in the process The required cost increases, which may lower economic efficiency.

The step (S1) of preparing a mixture by mixing the coal tar-based raw material and the solvent may further include a stirring process. The step of preparing the mixture may be performed at 20 °C to 150 °C. Accordingly, the step (S2) of separating the supernatant and the lower layer solution containing the solid content from the mixture by a subsequent centrifugation method or a decanting method can be smoothly performed.

The method for manufacturing an impregnated pitch according to an embodiment of the present invention may include a step (S2) of separating a supernatant and a lower layer solution containing a solid content from the mixture by a centrifugal separation method or a decanting method. The lower layer solution may contain a large amount of solid content. The solid content may mean a material of a solid component contained in coal tar, and for example, ash, quinoline insoluble (QI), coal, coke, or cenosphere may include. The mixture may be separated into the supernatant and the lower layer by centrifugation or decanting.

The content of the solids in the supernatant may be 0.0001 wt% to 0.5 wt%, 0.0001 wt% to 0.3 wt%, or 0.0001 wt% to 0.1 wt%, based on the total weight of the supernatant. Most of the solid content may be composed of quinoline insoluble matter (QI), which may remain in the coal tar pitch after light oil, absorption oil, creosote, etc. are separated from the coal tar-based raw material by a subsequent distillation process. That is, the content of the quinoline insoluble matter (QI) in the supernatant may be 0.0001 wt% to 0.5 wt%, 0.0001 wt% to 0.3 wt%, or 0.0001 wt% to 0.1 wt%, based on the total weight of the supernatant.

The temperature at which the step of separating the supernatant and the lower layer from the mixture is performed is preferably higher within a temperature at which the solvent is not evaporated. For example, the step of separating the supernatant and the lower layer from the mixture may be performed at 20 °C to about 150 °C.

The centrifugal force (G-force) of the centrifugation method or the decanting method may be 1,000 G to 10,000 G. As the value of the centrifugal force (G-force) increases, the solids removal rate and the recovery rate of coal tar from the coal tar-based raw material may increase.

According to the present invention, it is possible to manufacture the impregnated pitch using the centrifugal separation method or the decanting method, it may be possible to manufacture the impregnated pitch in a continuous process.

The method of manufacturing an impregnated pitch according to an embodiment of the present invention may include a step (S3) of recovering the solvent from the supernatant to obtain a residue. Recovering the solvent from the supernatant may further include performing a distillation process on the supernatant. For example, the distillation process may include an atmospheric distillation process or a reduced pressure distillation process. The solvent may be distilled and recovered by the atmospheric distillation process or the vacuum distillation process. Accordingly, a residue from which quinoline insoluble matter (QI) is removed from the supernatant may be obtained. The recovered solvent may be recycled and reused.

The method of manufacturing an impregnated pitch according to an embodiment of the present invention may include performing a distillation process and a heat treatment process on the residue (S4). For example, the distillation process may be an atmospheric distillation process or a reduced pressure distillation process. For example, the heat treatment temperature of the heat treatment process may be 230 °C to 400 °C. Coal tar oil in the impregnated pitch may be removed by performing a distillation process and a heat treatment process on the residue (S4). Specifically, by performing a distillation process and a heat treatment process on the residue (S4), light oil and/or heavy oil in the residue may be removed, and a polycondensation reaction by heat occurs to increase the content of beta-resin. can be Also, the softening point of the impregnation pitch can be increased.

On the other hand, when the heat treatment temperature of the heat treatment process is less than 230 ° C., light oil and heavy oil may not be sufficiently removed, and polycondensation reaction may not sufficiently occur, so it may be difficult to manufacture a high quality impregnated pitch. When the heat treatment temperature of the heat treatment process is more than 400 ° C., excessive polycondensation reaction may proceed and coking may occur, or an intermediate mesophase that is not soluble in quinoline may be generated, thereby inhibiting the impregnation property of the impregnation pitch. . Accordingly, it may be difficult to manufacture a high-quality impregnation pitch.

The step (S4) of performing a distillation process and a heat treatment process on the residue may further include an inert gas or steam injection process. For example, the inert gas may include nitrogen. Light oil and heavy oil may be sufficiently removed by the inert gas or steam injection process.

The softening point of the impregnated pitch manufactured by the method of manufacturing the impregnated pitch according to an embodiment of the present invention may be, for example, 60 °C to 120 °C. The content of the quinoline insoluble in the impregnated pitch may be 0.0001 wt% to 0.5 wt% based on the total weight of the impregnated pitch. The beta-resin content in the impregnated pitch may be 10 wt% to 30 wt% based on the total weight of the impregnated pitch. The ash content in the impregnated pitch may be 0.0001 wt% to 0.3 wt% based on the total weight of the impregnated pitch. The yield of the impregnated pitch may be 30% to 90%. The impregnated pitch may be obtained in an amount of 30 wt% to 90 wt% based on the total weight of the coal tar-based raw material.

Conventionally, in order to remove the quinoline insoluble component, the impregnated pitch was prepared after removing the quinoline insoluble component by static sedimentation using an aliphatic solvent or a filtration method in which coal tar pitch is dissolved in an aromatic solvent. On the other hand, the manufacturing method of the impregnated pitch according to the present invention, compared to the conventional manufacturing method, the manufacturing process is simple and can be manufactured continuously, and the recovery amount of beta-resin is high, so that the impregnated pitch with high carbonization yield can be manufactured. can

Example

Example 1

A mixing process of mixing coal tar pitch and coal tar-based aromatic oil was performed. The coal tar pitch has a softening point of 40° C., and the content of quinoline insolubles is 3.8 wt% based on the total weight of the coal tar pitch. The coal tar-based aromatic fraction has an aromatic index of 0.87, quinoline and isoquinoline content is 3 wt% or less based on the total weight of the coal tar-based aromatic fraction, and a boiling point at atmospheric pressure is 240 °C to 270 °C. The mixing process was carried out at 90 °C. The coal tar pitch and the coal tar-based aromatic oil were mixed in a weight ratio of 60:40, and stirred using a mechanical stirrer.

After preparing a mixed solution by the mixing process, it was placed in a centrifuge and separated into a supernatant and a lower layer at a separation temperature of 90 °C and a centrifugal force of 3500 G (G-force). Thereafter, the residue obtained by recovering the solvent from the supernatant was subjected to a reduced pressure heat treatment process at 200 torr and 340° C. for 5 hours. As a result, the softening point of the obtained impregnated pitch was 84°C. In addition, it was confirmed that the impregnated pitch contained 0.15 wt% of quinoline insoluble content, 18.5 wt% of beta-resin, and 0.02 wt% of ash based on the total weight of the impregnated pitch. It was possible to obtain an impregnated pitch of 72% relative to the weight of the raw material, coal tar pitch.

Example 2

A mixing process of mixing carbon black raw material oil and coal tar-based aromatic oil was performed. The carbon black raw material oil has a softening point of 30° C. or less, and the content of quinoline insoluble content is 2.8 wt% based on the total weight of the carbon black raw material oil. The coal tar-based aromatic fraction has an aromatic index of 0.82, quinoline and isoquinoline content is 0.2 wt% or less based on the total weight of the coal tar-based aromatic fraction, and a boiling point at atmospheric pressure is 260 °C to 300 °C. The mixing process was performed at 70 °C. The carbon black raw material oil and the coal tar aromatic oil were mixed in a weight ratio of 50:50, and stirred using a mechanical stirrer.

After preparing the mixed solution by the mixing process, it was put in a centrifuge and separated into a supernatant and a lower layer at a separation temperature of 70 °C and a centrifugal force of 3000 G (G-force). Thereafter, the residue obtained by recovering the solvent from the supernatant was subjected to a reduced pressure heat treatment process at 150 torr and 350° C. for 6 hours. As a result, the softening point of the obtained impregnated pitch was 92°C. In addition, it was confirmed that the impregnated pitch contained 0.22 wt% of quinoline insoluble content, 19.3 wt% of beta-resin, and 0.03 wt% of ash content relative to the total weight of the impregnated pitch. It was possible to obtain an impregnation pitch of 64% based on the weight of the raw material carbon black raw material oil.

Example 3

A mixing process of mixing heavy tar and solvent was performed. The heavy tar contains 9.72 wt % of solids relative to the total weight of the heavy tar. The solvent has an aromatic index of 0.92, a quinoline and isoquinoline content of 0.1 wt% or less based on the total weight of the first coal tar-based aromatic oil, and a first coal tar-based aromatic oil having an atmospheric boiling point of 290 °C to 330 °C, and an aromatic index is 0.87, the quinoline and isoquinoline content is 3 wt% or less based on the total weight of the second coal tar-based aromatic oil, and may include a second coal tar-based aromatic oil having an atmospheric boiling point of 240 °C to 270 °C. In the solvent, the first coal tar-based aromatic fraction and the second coal tar-based aromatic fraction may be mixed in a weight ratio of 50:50. The solvent and the heavy tar were mixed in a weight ratio of 45:55, and stirred using a mechanical stirrer.

After preparing a mixed solution by the mixing process, it was placed in a centrifuge and separated into a supernatant and a lower layer at a separation temperature of 85° C. and a centrifugal force of 2800 G (G-force). Thereafter, the residue obtained by recovering the solvent from the supernatant was subjected to a reduced pressure heat treatment process at 180 torr and 320° C. for 5 hours. As a result, the softening point of the obtained impregnated pitch was 80.1 DEG C. In addition, it was confirmed that the impregnated pitch contained 0.09 wt% of quinoline insoluble content, 16.5 wt% of beta-resin, and 0.01 wt% of ash content relative to the total weight of the impregnated pitch. It was possible to obtain an impregnation pitch of 47% based on the weight of the raw material, heavy tar.

Example 4

A mixing process of mixing coal tar and petroleum-based aromatic oil was performed. The coal tar has a quinoline insoluble content of 1.4 wt% based on the total weight of the coal tar. The petroleum-based aromatic fraction has an aromatic index of 0.78, quinoline and isoquinoline content is 0.01% or less based on the total weight of the petroleum-based aromatic fraction, and a boiling point at atmospheric pressure is 140°C to 320°C. The mixing process was performed at 50 °C. The coal tar and the petroleum aromatic fraction were mixed in a weight ratio of 65:35, and stirred using a mechanical stirrer.

After preparing the mixed solution by the mixing process, it was placed in a centrifuge and separated into a supernatant and a lower layer at a separation temperature of 50 °C and a centrifugal force of 3300 G (G-force). Thereafter, the residue obtained by recovering the solvent from the supernatant was subjected to a reduced pressure heat treatment process at 100 torr and 360° C. for 3 hours. As a result, the softening point of the obtained impregnated pitch was 82.8°C. In addition, it was confirmed that the impregnated pitch contained 0.38 wt% of quinoline insoluble content, 15.2 wt% of beta-resin, and 0.02 wt% of ash content relative to the total weight of the impregnated pitch. It was possible to obtain an impregnated pitch of 42% based on the weight of the raw material coal tar.

Comparative Example 1

A mixing process of mixing coal tar pitch and coal tar-based aromatic oil was performed. The coal tar pitch has a softening point of 40° C., and the content of quinoline insolubles is 3.8 wt% based on the total weight of the coal tar pitch. The coal tar-based aromatic fraction has an aromatic index of 0.89, quinoline and isoquinoline content is 14 wt% or more based on the total weight of the coal tar-based aromatic fraction, and a boiling point at atmospheric pressure is 235 to 270 °C. The mixing process was carried out at 90 °C. The coal tar pitch and the coal tar-based aromatic oil were mixed in a weight ratio of 60:40, and stirred using a mechanical stirrer.

After preparing a mixed solution by the mixing process, it was placed in a centrifuge and separated into a supernatant and a lower layer at a separation temperature of 90 °C and a centrifugal force of 3500 G (G-force). Thereafter, the residue obtained by recovering the solvent from the supernatant was subjected to a reduced pressure heat treatment process at 200 torr and 340° C. for 5 hours. As a result, the softening point of the obtained impregnated pitch was 87°C. In addition, it was confirmed that the impregnated pitch contained 0.85 wt% of quinoline insoluble content, 17.2 wt% of beta-resin, and 0.04 wt% of ash content relative to the total weight of the impregnated pitch. It was possible to obtain an impregnated pitch of 74% based on the weight of the raw material, coal tar pitch.

According to Comparative Example 1, it can be seen that the quinoline insoluble content of the impregnated pitch prepared using a solvent containing high content of quinoline and isoquinoline is higher than the standard value of 0.5 wt%.

Comparative Example 2

A mixing process of mixing coal tar pitch and petroleum kerosene was performed. The coal tar pitch has a softening point of 40 °C, and the content of quinoline insolubles is 3.8 wt% based on the total weight of the coal tar pitch. The petroleum-based kerosene has an aromatic index of 0.03, quinoline and isoquinoline content is 0.01 wt% or less based on the total weight of petroleum-based kerosene, and a boiling point at atmospheric pressure is 180°C to 250°C. The mixing process was carried out at 90 °C. The coal tar pitch and the petroleum kerosene were mixed in a weight ratio of 60:40, and stirred using a mechanical stirrer.

After preparing the mixed solution by the mixing process, it was put in a centrifuge and centrifuged at a separation temperature of 90 ° C and a centrifugal force of 3500 G, but only layer separation of petroleum kerosene and coal tar pitch occurred. , recovery of coal tar pitch as a supernatant did not occur.

According to Comparative Example 2, when a solvent having a low aromatic index is used, since the coal tar-based raw material and the solvent may not be mixed, the recovery rate of the coal tar component may be low, and finally, the preparation of the impregnated pitch may be difficult. can be checked

Above, although embodiments of the present invention have been described with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (12)

preparing a mixture by mixing a coal tar-based raw material and a solvent;
Separating the supernatant and the lower layer containing the solid content from the mixture by centrifugation or decanting (decanting) method;
recovering the solvent from the supernatant to obtain a residue; and
In the method for producing an impregnated pitch comprising the step of performing a distillation process and a heat treatment process on the residue,
The coal tar-based raw material includes at least one of coal tar, heavy tar, coal tar-based carbon black raw material oil, and coal tar pitch having a softening point of 10°C to 90°C,
The solvent comprises 1 to 4 aromatic rings, substituted or unsubstituted, and the aromatic index of the solvent is 0.7 to 1,
The boiling point of the solvent is 100 ℃ to 350 ℃,
The content of quinoline and isoquinoline in the solvent is 0 wt% to 5.0 wt%, based on the total weight of the impregnated pitch,
The softening point of the impregnated pitch is 60 ℃ to 120 ℃,
The content of quinoline insoluble in the impregnated pitch is 0.0001 wt% to 0.5 wt%, based on the total weight of the impregnated pitch,
The beta-resin content in the impregnated pitch is 10 wt% to 30 wt% of the total weight of the impregnated pitch. The method of claim 1,
The solvent is a method for producing an impregnated pitch comprising a single aromatic compound or a mixed aromatic compound. The method of claim 1,
The distillation process is an atmospheric distillation process or a reduced pressure distillation process,
The heat treatment temperature of the heat treatment process is a method of manufacturing an impregnated pitch of 230 ℃ to 400 ℃. The method of claim 1,
Preparing the mixture and separating the supernatant and the lower layer from the mixture is a method for producing an impregnated pitch performed at 20 °C to 150 °C. The method of claim 1,
The weight ratio of the coal tar-based raw material and the solvent is 90:10 to 20:80, the method for producing an impregnated pitch. The method of claim 1,
The content of the quinoline insoluble (QI) in the supernatant is 0.0001 wt% to 0.5 wt% of the total weight of the supernatant. Method for producing an impregnated pitch. The method of claim 1,
Recovering the solvent from the supernatant is a method for producing an impregnated pitch comprising performing an atmospheric distillation process or a reduced pressure distillation process on the supernatant. The method of claim 1,
Method for producing an impregnated pitch in which coal tar oil in the impregnated pitch is removed by performing a distillation process and a heat treatment process on the residue. The method of claim 1,
The step of performing a distillation process and a heat treatment process on the residue, the method of manufacturing an impregnated pitch further comprising an injection process of inert gas or steam. 10. The method of claim 9,
The inert gas is a method for producing an impregnated pitch containing nitrogen or argon. The method of claim 1,
The ash content in the impregnated pitch is 0.0001 wt% to 0.3 wt% of the total weight of the impregnated pitch. The method of claim 1,
The yield of the impregnated pitch is 30% to 90% of the impregnated pitch manufacturing method.

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