Method and system for preparing needle coke raw material from catalytic slurry oil and ethylene tar

Abstract

The invention relates to a method and system for preparing a needle coke raw material from catalytic slurry oil and ethylene tar, the catalytic slurry oil and the ethylene tar are mixed and preheated, then a hydrogen transfer reaction is carried out to obtain a mixed material, the mixed material is heated, and then vacuum fractionation is carried out to obtain a wax oil fraction capable of producing needle coke. The additional value of the ethylene tar and the catalytic slurry oil is improved; ethylene tar and catalytic slurry oil are mixed and preheated and then subjected to a hydrogen transfer reaction, an additional hydrogenation device is not needed, and the equipment cost is reduced; the hydrogen transfer reaction improves the aromatic hydrocarbon content in the catalytic slurry oil, further improves the yield of the needle coke raw material, improves the stability of ethylene tar, and prolongs the production operation cycle of the furnace tube of the heating furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of preparing needle coke raw materials, and specifically to a method and system for preparing needle coke raw materials from catalytic slurry oil and ethylene tar. Background Art

[0002] Needle coke has the characteristics of small thermal expansion coefficient, high electrical conductivity and large true density. It is a high-quality raw material for producing high-power graphite electrodes, ultra-high-power graphite electrodes, anode materials for lithium-ion batteries, special carbon materials, nuclear graphite and other high-end carbon products, and is widely used in the steelmaking industry, new energy industry, national defense, medical treatment, aerospace and other fields. Needle coke is divided into oil-based needle coke and coal-based needle coke according to the raw material source. Compared with coal-based needle coke, oil-based needle coke has lower CTE and specific resistance, better comprehensive performance indicators, and more applications and demands.

[0003] Catalytic slurry oil is rich in 3-5 ring aromatic hydrocarbons and is an ideal raw material for preparing needle coke. However, catalytic slurry oil contains a large amount of catalyst solid particles, and the contents of impurities such as asphaltene, sulfur, nitrogen and metal are high. Therefore, it must be pretreated to obtain the raw material for preparing needle coke, and then needle coke is produced through a delayed coking unit. The applicant previously applied for a patent for a method and system for co-producing needle coke and low-sulfur petroleum coke (Patent No.: CN113122329A). After the catalytic slurry oil is mixed with hydrogen, it enters the hydrogenation reaction zone and reacts in the presence of a hydrogenation catalyst to generate a refined oil product. The refined oil enters a vacuum distillation system for separation to obtain an intermediate fraction as the raw material for producing needle coke, and the intermediate fraction enters a needle coke production unit to obtain needle coke. However, this method involves hydrotreating, which requires hydroprocessing equipment and increases the equipment cost. At the same time, the catalytic slurry oil contains saturated hydrocarbons mainly composed of naphthenes, resulting in poor cracking performance.

[0004] A patent for a method for producing needle coke by using an optimized ethylene tar-containing raw material (Patent No.: CN113755211). In this method, the ethylene tar-containing raw material is hydrogenated in a hydrogenation tower, and then the hydrogenated material is pumped into a gas-water separator for separation. The separated product is injected into a distillation tower for distillation, and the bottom material after distillation is used as the needle coke raw material. Although this method pretreats ethylene tar, the process is long and involves a hydrogenation process, increasing the equipment cost. Summary of the Invention

[0005] In order to solve the problem of high equipment cost in producing needle coke raw materials in the prior art, the present invention provides a method and system for preparing needle coke raw materials from catalytic slurry oil and ethylene tar, reducing the equipment cost, improving the utilization rate of catalytic slurry oil, enhancing the stability of ethylene tar, and increasing the yield of needle coke.

[0006] To achieve the above object, the specific solution adopted by the present invention is as follows: A method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar. The catalytic slurry oil and ethylene tar are mixed and preheated, and then subjected to a hydrogen transfer reaction to obtain a mixed material. The mixed material is heated and then subjected to vacuum fractionation to obtain a wax oil fraction capable of producing needle coke.

[0007] As an optimized scheme of the above method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar: In the mixed liquid obtained by mixing the catalytic slurry oil and ethylene tar, the mass of ethylene tar accounts for 20%-70% of the mass of the mixed liquid.

[0008] As another optimized scheme of the above method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar: The catalytic slurry oil and ethylene tar are preheated to 310-400°C before the hydrogen transfer reaction.

[0009] As another optimized scheme of the above method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar: The reaction temperature of the hydrogen transfer reaction is 300-390°C, the reaction pressure is 1.5-5.0 MPa, and the reaction time is 30-180 min.

[0010] As another optimized scheme of the above method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar: The mixed material is heated to 360-450°C before vacuum fractionation.

[0011] As another optimized scheme of the above method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar: The pressure of the vacuum fractionation of the mixed material is 0.1-10.0 KPa.

[0012] As another optimized scheme of the above method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar: The aromatic hydrocarbon content in the catalytic slurry oil is greater than 50%, the saturated fraction content does not exceed 40%, and the sulfur content is 0.5%-2.0%; the olefin content in the ethylene tar does not exceed 30%, the aromatic hydrocarbon content is greater than 50%, and the gum + asphaltene content does not exceed 30%.

[0013] An apparatus for preparing needle coke raw materials from catalytic slurry oil and ethylene tar, comprising a heating furnace having at least one convection chamber and at least one radiation chamber, a buffer tank, and a vacuum tower. The catalytic slurry oil and ethylene tar respectively enter the convection chamber through the slurry oil pipeline and the tar pipeline. The outlet of the convection chamber is connected to a hydrogen transfer reactor. After the catalytic slurry oil and ethylene tar are mixed, they enter the convection chamber for preheating, and then enter the bottom of the hydrogen transfer reactor for a hydrogen transfer reaction to obtain a mixed material. The mixed material is buffered by the buffer tank and then enters the radiation chamber for heating, and finally enters the vacuum tower for vacuum fractionation to obtain a wax oil fraction.

[0014] As an optimized solution of the above-mentioned system for preparing needle coke raw materials from catalytic slurry oil and ethylene tar: the bottom end of the hydrogen transfer reactor is connected to the outlet of the convection chamber through the first pipeline, and its top end is connected to the buffer tank through the second pipeline.

[0015] A method for preparing needle coke from catalytic slurry oil and ethylene tar, which uses catalytic slurry oil and ethylene tar to prepare raw materials capable of producing needle coke. After delayed coking, needle coke is obtained. The method for preparing the raw materials for needle coke from catalytic slurry oil and ethylene tar is the above-mentioned method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar.

[0016] A system for preparing needle coke from catalytic slurry oil and ethylene tar, including a raw material preparation device and a delayed coking device for preparing needle coke raw materials. The raw material preparation device is the above-mentioned device for preparing needle coke raw materials from catalytic slurry oil and ethylene tar. The delayed coking device is connected to the wax oil fraction outlet of the vacuum tower. The wax oil fraction produced by the vacuum tower enters the delayed coking device for reaction to obtain needle coke.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a method and a system for preparing needle coke raw materials from catalytic slurry oil and ethylene tar. Using ethylene tar and catalytic slurry oil as raw materials, the added value of ethylene tar and catalytic slurry oil is increased; after the ethylene tar and catalytic slurry oil are mixed and preheated, a hydrogen transfer reaction is carried out, and no additional hydrogenation device is required, reducing the equipment cost; the hydrogen transfer reaction increases the aromatic hydrocarbon content in the catalytic slurry oil, thereby increasing the yield of the needle coke raw materials. At the same time, the stability of ethylene tar is increased, and the service life of the heating furnace tubes is improved. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the system for preparing needle coke raw materials of the present invention;

[0020] Figure 2 is an optical picture of the needle coke prepared in Example 9;

[0021] Figure 3 is an optical picture of the needle coke prepared in Example 10;

[0022] Reference numerals: 1, first raw material tank; 2, second raw material tank; 3, heating furnace; 4, hydrogen transfer reactor; 5, buffer tank; 6, vacuum tower. Detailed Embodiments

[0023] The technical solution of the present invention will be further elaborated in detail below in combination with specific embodiments. For the parts not detailedly described and disclosed in the following embodiments of the present invention, they should all be understood as the prior art known or should be known to those skilled in the art, such as the specific structures of the delayed coking unit, the delayed coking process, the heating furnace, and the vacuum tower.

[0024] A method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar. The aromatic hydrocarbon content in the catalytic slurry oil is greater than 50%, the saturated fraction content does not exceed 40%, and the sulfur content is 0.5% - 2.0%; the olefin content in the ethylene tar does not exceed 30%, the aromatic hydrocarbon content is greater than 50%, and the gum + asphaltene content does not exceed 30%. The catalytic slurry oil and ethylene tar are mixed and preheated and then subjected to a hydrogen transfer reaction to obtain a mixed material. The catalytic slurry oil and ethylene tar undergo a hydrogen transfer reaction under the condition of a hydrogen transfer catalyst. Specifically, the catalytic slurry oil contains about 30% saturated hydrocarbons, and the saturated hydrocarbons are mainly naphthenes. Then, the naphthenes and hydrogenated aromatic hydrocarbons in the catalytic slurry oil are used as hydrogen donors to dehydrogenate and generate aromatic hydrocarbons, thereby increasing the aromatic hydrocarbon content in the catalytic slurry oil; the hydrogen removed is transferred to the olefins in the ethylene tar, so that the olefins are reduced to stable components, reducing the coking performance of the ethylene tar and increasing the service life of the heating furnace tubes. The mixed material is heated and then subjected to vacuum fractionation to obtain a wax oil fraction that can be used to produce needle coke. The mixed material is heated and then subjected to vacuum fractionation to obtain gas, gasoline fraction, diesel fraction, wax oil fraction, and bottom tower oil. Among them, the wax oil fraction is used as the needle coke raw material. The yield of the needle coke raw material prepared by this method is high, improving the yield of needle coke; at the same time, it is not necessary to pretreat the catalytic slurry oil, reducing the process procedures and not requiring hydrogenation equipment, reducing the equipment and operation costs. The present invention uses cheap and abundant ethylene tar and catalytic slurry oil as raw materials to produce needle coke raw materials, increasing the added value of the catalytic slurry oil and ethylene tar. At the same time, the utilization rate of the catalytic slurry oil and ethylene tar is increased.

[0025] In the mixed liquid obtained by mixing the catalytic slurry oil and ethylene tar, the mass of the ethylene tar accounts for 20% - 70% of the mass of the mixed liquid. The catalytic slurry oil and ethylene tar are preheated to 310 - 400 °C before the hydrogen transfer reaction, that is, the mixed liquid is heated to 310 - 400 °C by a heating furnace. Subsequently, the preheated mixed liquid enters a hydrogen transfer reactor filled with a hydrogen transfer catalyst to carry out a hydrogen transfer reaction to obtain a mixed material; the mixed material is heated to 360 - 450 °C by a heating furnace, preferably 380 - 420 °C, and the heated mixed material enters a vacuum tower for vacuum fractionation to obtain a wax oil fraction. Among them, the reaction temperature of the hydrogen transfer reaction is 300 - 390 °C, preferably 330 - 360 °C, the reaction pressure is 1.5 - 5.0 MPa, preferably 2.0 - 4.0 MPa, the reaction time is 30 - 180 min, preferably 60 - 150 min; the pressure of the vacuum fractionation of the mixed material is 0.1 - 10.0 KPa, preferably 0.5 - 5.0 KPa.

[0026] Example 1

[0027] The main physical properties of the catalytic slurry oil and ethylene tar used in this example are shown in Table 1. The catalytic slurry oil and ethylene tar are mixed to obtain a mixed liquid, and the mass of ethylene tar accounts for 50% of the mass of the mixed liquid, that is, the feed rate of the catalytic slurry oil is equal to the feed rate of the ethylene tar; the mixed liquid is preheated to 320 °C for a hydrogen transfer reaction to obtain a mixed material, the temperature of the hydrogen transfer reaction is 300 °C, the reaction time is 150 min, and the reaction pressure is 4.0 MPa; the obtained mixed material is heated to 400 °C; then vacuum fractionation is carried out to obtain wax oil, the pressure of the vacuum fractionation is 0.5 KPa, and the main process parameters are shown in Table 2. The yield and main physical properties of the wax oil fraction are shown in Table 3.

[0028] Example 2

[0029] The main physical properties of the catalytic slurry oil and ethylene tar used in this example are shown in Table 1. The catalytic slurry oil and ethylene tar are mixed to obtain a mixed liquid, and the mass of ethylene tar accounts for 62.5% of the mass of the mixed liquid, that is, the ratio of the feed rate of the catalytic slurry oil to the feed rate of the ethylene tar is 3:5; the mixed liquid is preheated to 340 °C for a hydrogen transfer reaction to obtain a mixed material, the temperature of the hydrogen transfer reaction is 320 °C, the reaction time is 120 min, and the reaction pressure is 4.0 MPa; the obtained mixed material is heated to 400 °C; then vacuum fractionation is carried out to obtain wax oil, the pressure of the vacuum fractionation is 0.6 KPa, and the main process parameters are shown in Table 2. The yield and main physical properties of the wax oil fraction are shown in Table 3.

[0030] Example 3

[0031] The main physical properties of the catalytic slurry oil and ethylene tar used in this example are shown in Table 1. The catalytic slurry oil and ethylene tar are mixed to obtain a mixed liquid, and the mass of ethylene tar accounts for 70% of the mass of the mixed liquid, that is, the ratio of the feed rate of the catalytic slurry oil to the feed rate of the ethylene tar is 3:7; the mixed liquid is preheated to 360 °C for a hydrogen transfer reaction to obtain a mixed material, the temperature of the hydrogen transfer reaction is 340 °C, the reaction time is 90 min, and the reaction pressure is 3.5 MPa; the obtained mixed material is heated to 400 °C; then vacuum fractionation is carried out to obtain wax oil, the pressure of the vacuum fractionation is 0.6 KPa, and the main process parameters are shown in Table 2. The yield and main physical properties of the wax oil fraction are shown in Table 3.

[0032] Example 4

[0033] The main physical properties of the catalytic slurry oil and ethylene tar used in this example are shown in Table 1. The catalytic slurry oil and ethylene tar are mixed to obtain a mixed liquid. The mass of ethylene tar accounts for 37.5% of the mass of the mixed liquid, that is, the ratio of the feed rate of catalytic slurry oil to the feed rate of ethylene tar is 5:3. The mixed liquid is preheated to 380 °C for a hydrogen transfer reaction to obtain a mixed material. The temperature of the hydrogen transfer reaction is 350 °C, the reaction time is 90 min, and the reaction pressure is 3.0 MPa. The obtained mixed material is heated to 410 °C. Subsequently, vacuum distillation is carried out to obtain wax oil. The pressure of vacuum distillation is 0.7 KPa, and the main process parameters are shown in Table 2. The yield and main physical properties of the wax oil fraction are shown in Table 3.

[0034] Example 5

[0035] The main physical properties of the catalytic slurry oil and ethylene tar used in this example are shown in Table 1. The catalytic slurry oil and ethylene tar are mixed to obtain a mixed liquid. The mass of ethylene tar accounts for 25.0% of the mass of the mixed liquid, that is, the ratio of the feed rate of catalytic slurry oil to the feed rate of ethylene tar is 3:1. The mixed liquid is preheated to 360 °C for a hydrogen transfer reaction to obtain a mixed material. The temperature of the hydrogen transfer reaction is 360 °C, the reaction time is 90 min, and the reaction pressure is 2.5 MPa. The obtained mixed material is heated to 410 °C. Subsequently, vacuum distillation is carried out to obtain wax oil. The pressure of vacuum distillation is 0.6 KPa, and the main process parameters are shown in Table 2. The yield and main physical properties of the wax oil fraction are shown in Table 3.

[0036] Example 6

[0037] The main physical properties of the catalytic slurry oil and ethylene tar used in this example are shown in Table 1. The catalytic slurry oil and ethylene tar are mixed to obtain a mixed liquid. The mass of ethylene tar accounts for 50% of the mass of the mixed liquid, that is, the ratio of the feed rate of catalytic slurry oil to the feed rate of ethylene tar is 1:1. The mixed liquid is preheated to 350 °C for a hydrogen transfer reaction to obtain a mixed material. The temperature of the hydrogen transfer reaction is 330 °C, the reaction time is 110 min, and the reaction pressure is 4.0 MPa. The obtained mixed material is heated to 410 °C. Subsequently, vacuum distillation is carried out to obtain wax oil. The pressure of vacuum distillation is 0.8 KPa, and the main process parameters are shown in Table 2. The yield and main physical properties of the wax oil fraction are shown in Table 3.

[0038] Example 7

[0039] An apparatus for preparing needle coke raw materials from catalytic slurry oil and ethylene tar, comprising a heating furnace 3 having at least one convection chamber and at least one radiation chamber, a buffer tank 5, and a vacuum tower 6. The heating furnace 3 is a box furnace, a vertical furnace, a cylindrical furnace, or a large square furnace. In this embodiment, the heating furnace 3 is a cylindrical furnace, and the heating furnace 3 has one convection chamber and two radiation chambers. The convection chamber is used to preheat the catalytic slurry oil and ethylene tar, and the radiation chamber is used to heat the mixed material. The catalytic slurry oil and ethylene tar enter the convection chamber through the slurry pipeline and the tar pipeline respectively, that is, the inlet of the convection chamber is connected to the slurry pipeline and the tar pipeline. In this embodiment, the catalytic slurry oil is stored in the first raw material tank 1, and the ethylene tar is stored in the second raw material tank 2. The first raw material tank 1 is connected to the inlet of the convection chamber through the slurry pipeline, and the second raw material tank 2 is connected to the slurry pipeline through the tar pipeline. And the connection point of the tar pipeline and the slurry pipeline is close to the inlet of the convection chamber; pumps are provided on both the slurry pipeline and the tar pipeline. The outlet of the convection chamber is connected to a hydrogen transfer reactor 4. The bottom end of the hydrogen transfer reactor 4 is connected to the outlet of the convection chamber through the first pipeline, and its top end is connected to the buffer tank 5 through the second pipeline; the bottom end of the buffer tank 5 pumps the mixed material in the buffer tank into the radiation chamber through a pump, and the outlet of the radiation chamber is connected to the vacuum tower 6.

[0040] After the catalytic slurry oil and ethylene tar are mixed, they enter the convection chamber for preheating, and then enter the bottom of the hydrogen transfer reactor for hydrogen transfer reaction to obtain a mixed material. The mixed material flows out from the top end of the hydrogen transfer reactor and enters the buffer tank. After being buffered by the buffer tank, the mixed material enters the radiation chamber for heating, and finally enters the vacuum tower for vacuum fractionation to obtain a wax oil fraction.

[0041] Example 8

[0042] A method for preparing needle coke from catalytic slurry oil and ethylene tar, using the raw materials for preparing needle coke from catalytic slurry oil and ethylene tar. The raw materials for needle coke are obtained by delayed coking to obtain needle coke. The method for preparing the raw materials for needle coke from catalytic slurry oil and ethylene tar is the above-mentioned method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar, that is, the raw materials for needle coke are wax oil fractions. The wax oil fractions enter the delayed coking unit for reaction to obtain needle coke. The operating conditions of the delayed coking are shown in Table 4.

[0043] Example 9

[0044] In this example, the wax oil fraction obtained in Example 4 is used as the raw material for needle coke, and delayed coking is carried out according to the process parameters shown in Table 4 to obtain needle coke. The yield and physical properties of the needle coke are shown in Table 5. The optical picture of the needle coke is as Figure 2 shown. The optical performance of the needle coke is good, and the fiber structure is obvious.

[0045] Example 10

[0046] In this example, the wax oil fraction obtained in Example 5 was used as the raw material for needle coke, and needle coke was obtained by delayed coking according to the process parameters shown in Table 4. The yield and physical properties of the needle coke are shown in Table 5, and the optical picture of the needle coke is as shown in Figure 3 shown. The needle coke has good optical properties and obvious fiber structure.

[0047] Comparative Example 1

[0048] In this example, a method and system for co-producing needle coke and low-sulfur petroleum coke (patent number: CN113122329A) were used to prepare needle coke. The yield and physical properties of the needle coke are shown in Table 5.

[0049] Compared with Comparative Example 1, the yield of the needle coke obtained in Example 9 and Example 10 is greater than that of the needle coke obtained in Comparative Example 1, that is, the present invention improves the yield of the needle coke.

[0050] Example 11

[0051] A system for preparing needle coke from catalytic slurry oil and ethylene tar includes a raw material preparation device for preparing the raw material for needle coke and a delayed coking device. The raw material preparation device is a device for preparing the raw material for needle coke from catalytic slurry oil and ethylene tar described in Example 8. The delayed coking device is connected to the wax oil fraction outlet of the vacuum tower 6, and the wax oil fraction generated by the vacuum tower 6 enters the delayed coking device for reaction to obtain needle coke.

[0052] Table 1 Main properties of catalytic slurry oil and ethylene tar

[0053] Table 2 Main operating parameters

[0054] Table 3 Yield and main physical properties of wax oil fraction

[0055] Table 4 Delayed coking process parameters

[0056] Table 5 Yield and main properties of needle coke

[0057] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar, characterized in that: The catalytic slurry and ethylene tar are mixed and preheated, and then subjected to a hydrogen transfer reaction to obtain a mixed material. The mixed material is heated and then subjected to vacuum fractionation to obtain a wax oil fraction capable of producing needle coke.

2. The method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar as claimed in claim 1, characterized in that: In the mixed liquid obtained by mixing the catalytic slurry and ethylene tar, the mass of ethylene tar accounts for 20%-70% of the mass of the mixed liquid.

3. The method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar as claimed in claim 1, characterized in that: The catalytic slurry and ethylene tar are preheated to 310-400 °C before the hydrogen transfer reaction.

4. The method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar as claimed in claim 1, wherein: The reaction temperature of the hydrogen transfer reaction is 300-390 °C, the reaction pressure is 1.5-5.0 MPa, and the reaction time is 30-180 min.

5. The method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar as claimed in claim 1, characterized in that: The mixed material is heated to 360-450 °C before vacuum fractionation.

6. The method for preparing needle coke raw materials from catalytic slurry oil and ethylene tar as claimed in claim 1, characterized in that: The pressure of the vacuum fractionation of the mixed material is 0.1-10.0 KPa.

7. A method for preparing raw materials for needle coke from catalytic slurry oil and ethylene tar as claimed in claim 1, characterized in that: The aromatic hydrocarbon content in the catalytic slurry is greater than 50%, the saturated fraction content does not exceed 40%, and the sulfur content is 0.5%-2.0%; the olefin content in the ethylene tar does not exceed 30%, the aromatic hydrocarbon content is greater than 50%, and the gum + asphaltene content does not exceed 30%.

8. An apparatus for preparing needle coke raw materials from catalytic oil slurry and ethylene tar, comprising a heating furnace (3) having at least one convection chamber and at least one radiation chamber, a buffer tank (5), and a vacuum tower (6). The catalytic oil slurry and ethylene tar respectively enter the convection chamber through an oil slurry pipeline and a tar pipeline. It is characterized in that: The outlet of the convection chamber is connected to a hydrogen transfer reactor (4). The catalytic slurry and ethylene tar are mixed and then enter the convection chamber for preheating, and then enter the bottom of the hydrogen transfer reactor (4) for a hydrogen transfer reaction to obtain a mixed material. The mixed material is buffered by a buffer tank (5) and then enters the radiation chamber for heating, and finally enters a vacuum tower (6) for vacuum fractionation to obtain a wax oil fraction.

9. The device for preparing needle coke raw materials from catalytic slurry oil and ethylene tar as claimed in claim 9, wherein: The bottom end of the hydrogen transfer reactor (4) is connected to the outlet of the convection chamber through a first pipeline, and its top end is connected to the buffer tank (5) through a second pipeline.

10. A method for preparing needle coke from catalytic slurry oil and ethylene tar, using catalytic slurry oil and ethylene tar as raw materials for preparing needle coke. The raw materials for needle coke are subjected to delayed coking to obtain needle coke, and it is characterized in that: The method for preparing a raw material for needle coke from catalytic slurry and ethylene tar is the method for preparing a raw material for needle coke from catalytic slurry and ethylene tar according to any one of claims 1-7.

11. A system for preparing needle coke from catalytic slurry oil and ethylene tar, comprising a raw material preparation device for preparing raw materials for needle coke and a delayed coking device, characterized in that: The raw material preparation device is a device for preparing a raw material for needle coke from catalytic slurry and ethylene tar according to any one of claims 8-9. The delayed coking device is connected to the wax oil fraction outlet of the vacuum tower. The wax oil fraction produced by the vacuum tower enters the delayed coking device for reaction to obtain needle coke.

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