Device for producing asphalt used as raw material of negative electrode material of lithium battery

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a device for producing asphalt used as a raw material of a lithium battery cathode material, which comprises a matching groove, and the matching groove is sequentially communicated to a tar light oil heat exchanger, a tar naphthalene oil heat exchanger, a maltha tar heat exchanger, a tar preheater and a tar dehydrating tower through a tar pump; an oil-gas outlet is formed in the top of the tar dehydrating tower, and a dehydrated tar outlet is formed in the bottom of the tar dehydrating tower and sequentially communicated with the tar / maltha heat exchanger, the heating furnace and the atmospheric tower through pipelines; the atmospheric tower is sequentially provided with a clear oil outlet, a carbolic oil outlet, a naphthalene oil outlet, a tar washing oil outlet and a maltha outlet from top to bottom; the maltha outlet is sequentially communicated with the dehydrated tar / maltha heat exchanger, the maltha / tar heat exchanger and the maltha storage tank, the maltha storage tank is communicated with the reaction kettle through a pump, and a discharge port at the bottom of the reaction kettle is communicated with the asphalt collecting box. Products produced by the device can meet market requirements, and enterprise revenue is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a device for producing asphalt used as a raw material for negative electrode materials of lithium batteries. Background Art

[0002] As an important component of lithium-ion batteries, negative electrode materials are made of a variety of materials. Currently, common negative electrode materials include carbon negative electrode materials, tin-based negative electrode materials, lithium-containing transition metal nitride negative electrode materials, alloy negative electrode materials, and nano-scale negative electrode materials. The negative electrode materials that have been actually used in lithium-ion batteries are generally carbon materials, such as graphite, soft carbon (such as coke), hard carbon, etc. The high softening point pitch obtained in the coal tar processing process is a mixture of various mixed aromatic hydrocarbons. Because it contains rich carbon elements, it can be used as a suitable raw material for lithium battery negative electrode materials. However, the current existing coal tar processing process does not separate the high softening point pitch. In order to use its characteristics to develop a new product that can be used to prepare a new raw material for lithium battery negative electrode materials, it is necessary to develop corresponding production equipment and production processes to meet market demand and improve corporate efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device for producing asphalt used as raw material for lithium battery negative electrode materials, which overcomes the defects of the existing technology and can produce asphalt used for preparing raw material for lithium battery negative electrode materials, meet market demand and improve enterprise benefits.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A device for producing asphalt used as a raw material for lithium battery negative electrode materials comprises a mixing tank, which is connected to a tar light oil heat exchanger, a tar naphthalene oil heat exchanger, a soft pitch tar heat exchanger, a tar preheater and a tar dehydration tower in sequence through a tar pump and a pipeline; the tar dehydration tower is provided with an oil and gas outlet at the top and a dehydrated tar outlet at the bottom, the dehydrated tar outlet is connected to a tar / soft pitch heat exchanger, a heating furnace and an atmospheric pressure tower in sequence through a pipeline; the atmospheric pressure tower is provided with a clear oil outlet, a phenol oil outlet, a naphthalene oil outlet, a tar wash oil outlet and a soft pitch outlet in sequence from top to bottom; the soft pitch outlet is connected to the dehydrated tar / soft pitch heat exchanger, the soft pitch / tar heat exchanger and a soft pitch storage tank in sequence through a pipeline, the soft pitch storage tank is connected to a reactor through a pump and a pipeline, and the discharge port at the bottom of the reactor is connected to an asphalt collection box through a pipeline.

[0006] Preferably, the blending tank is provided with a stirring device to blend the crude tar raw materials obtained from production and external purchase.

[0007] Preferably, a condenser is provided at the top of the tar dehydration tower, and a heater for tar heating circulation is provided at the bottom.

[0008] Preferably, the oil and gas outlet of the tar dehydration tower is connected back to the tar dehydration tower through a pipeline and the first oil-water separator and the second oil-water separator connected thereto, and the water outlet of the first oil-water separator is connected to the wastewater storage tank.

[0009] Preferably, the clear oil outlet of the atmospheric tower is sequentially connected to an oil-water cooler, a third oil-water separator and a fourth oil-water separator through a pipeline, the water outlet of the third oil-water separator is respectively connected to an oil-water cooler and a wastewater storage tank through a pump and a pipeline, and the oil outlet of the fourth oil-water separator is back-connected to the atmospheric tower through a pipeline and a pump; the phenol oil outlet and the naphthalene oil outlet of the atmospheric tower are respectively connected to a phenol-naphthalene mixing tank through a phenol oil / naphthalene oil cooler; the tar wash oil outlet of the atmospheric tower is connected to a side tower through a pipeline, a back-connecting pipeline is provided in the middle of the side tower to be back-connected to the atmospheric tower, and a discharge port at the bottom of the side tower is connected to a tar wash oil storage tank; a steam inlet (for inputting superheated steam for distillation) is also respectively provided on one side of the bottom of the tower body of the atmospheric tower and the side tower.

[0010] Furthermore, the phenol-naphthalene mixing tank is connected to the oil mixing tank through a pipeline, a pump and a valve.

[0011] Preferably, the reactor is provided with an electric heating system, and the material inlet of the reactor is provided with a flow meter and a shut-off valve, and the flow meter, the shut-off valve and the electric heating system are interlocked and controlled with each other; the reactor is also provided with a gas inlet, and the gas inlet is connected to a nitrogen heater and a purified compressed air pump (compressed air accounts for 20%) through a gas mixer, and the nitrogen heater and the purified compressed air pump are connected to a nitrogen storage tank and a purified compressed air storage tank through pipelines, respectively; an exhaust gas outlet is provided at the top of the reactor, and the exhaust gas outlet is connected to an exhaust gas absorption device through an exhaust main pipe.

[0012] Preferably, the asphalt collection box is provided with an inner box and an outer box, and both the inner box and the outer box are provided with corresponding feed ports; a box door is provided on one side of the outer box, and a sealing ring is provided around the box door; a slide rail for pushing the inner box is provided at the bottom inner side of the outer box, and a hydraulic jack is also provided, the jack lifts the inner box, and the upper part of the inner box is tightly connected to the upper part of the outer box through a sealing ring; the inner box and the outer box are both provided with nitrogen replacement valves, and the nitrogen replacement valves are connected to the nitrogen supply device outside the box through a pipeline.

[0013] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0014] In summary, the utility model prepares the raw material crude tar and feeds it into a tar dehydration tower for distillation and dehydration. The dehydrated tar obtained after dehydration is heated in a tar / soft asphalt heat exchanger and then heated to 330°C in a heating furnace. The dehydrated tar is supplied to a normal pressure tower in a gas-liquid mixed phase state. Steam is introduced into the bottom of the normal pressure tower for steam blowing. The obtained soft asphalt enters a soft asphalt storage tank after heat exchange and is then transported to a reactor for heating treatment under nitrogen protection to obtain raw asphalt for lithium battery negative electrode materials. This meets market demand and improves corporate efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] In the figure, 1. blending tank; 2. tar light oil heat exchanger; 3. tar naphthalene oil heat exchanger; 4. soft pitch tar heat exchanger; 5. tar preheater; 6. tar dehydration tower; 7. tar / soft pitch heat exchanger; 8. heating furnace; 9. atmospheric pressure tower; 10. dehydrated tar / soft pitch heat exchanger; 11. soft pitch / tar heat exchanger; 12. soft pitch storage tank; 13. reactor; 14. pitch collecting box; 15. heater; 16. first oil-water separator; 17. second oil-water separator; 18. wastewater storage tank; 19. oil-water cooler; 20. third oil-water separator; 21. fourth oil-water separator; 22. phenol oil / naphthalene oil cooler; 23. phenol-naphthalene mixing tank; 24. side tower. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1

[0019] like Figure 1 As shown, the utility model is a device for producing asphalt for lithium battery negative electrode material raw material, including a mixing tank 1, which is connected to a tar light oil heat exchanger 2, a tar naphthalene oil heat exchanger 3, a soft pitch tar heat exchanger 4, a tar preheater 5 and a tar dehydration tower 6 in sequence through a tar pump (not marked) and a pipeline (not marked); the tar dehydration tower 6 is provided with an oil and gas outlet (not marked) at the top and a dehydrated tar outlet (not marked) at the bottom, and the dehydrated tar outlet is connected to a tar / soft pitch heat exchanger 7, a heating furnace 8 and a normal pressure heat exchanger 7 in sequence through a pipeline. Tower 9; the atmospheric pressure tower 9 is provided with a clear oil outlet (not marked), a phenol oil outlet (not marked), a naphthalene oil outlet (not marked), a tar wash oil outlet (not marked) and a soft asphalt outlet (not marked) from top to bottom; the soft asphalt outlet is connected to the dehydrated tar / soft asphalt heat exchanger 10, the soft asphalt / tar heat exchanger 11 and the soft asphalt storage tank 12 in sequence through pipelines, and the soft asphalt storage tank 12 is connected to the reactor 13 through a pump (not marked) and a pipeline, and the discharge port (not marked) at the bottom of the reactor 13 is connected to the asphalt collection box 14 through a pipeline.

[0020] A condenser (not shown) is provided at the top of the tar dehydration tower 6, and a heater 15 for tar heating circulation is provided at the bottom; the oil and gas outlet of the tar dehydration tower 6 is connected back to the tar dehydration tower 6 through a pipeline and the first oil-water separator 16 and the second oil-water separator 17 connected thereto, and the water outlet of the first oil-water separator 16 is connected to the wastewater storage tank 18.

[0021] The clear oil outlet of the atmospheric tower 9 is communicated with an oil-water cooler 19, the third oil-water separator 20 and the fourth oil-water separator 21 in sequence through a pipeline, the water outlet of the third oil-water separator 20 is communicated to the oil-water cooler 19 and the wastewater storage tank 18 respectively through a pump and a pipeline, and the oil outlet of the fourth oil-water separator 21 is connected back to the atmospheric tower 9 through a pipeline and a pump; the phenol oil outlet and the naphthalene oil outlet of the atmospheric tower 9 are communicated to the phenol-naphthalene mixing tank 23 respectively through the phenol oil / naphthalene oil cooler 22; the tar wash oil outlet of the atmospheric tower 9 is communicated to the side tower 24 through a pipeline, and the middle part of the side tower 24 is provided with a back-connecting pipeline that is back connected to the atmospheric tower 9, and the discharge port at the bottom of the side tower 24 is communicated to the tar wash oil storage tank (not shown); one side of the tower body bottom of the atmospheric tower 9 and the side tower 24 is also respectively provided with a steam inlet (not shown).

[0022] The actual production process is as follows: the crude tar produced in the coal tar processing process and the purchased crude tar are first pumped into a static tar tank (not marked) at the raw material loading and unloading station; the tar after static dehydration is separated and deslagging in a super centrifuge (not marked), dehydrated and then flows into a waterless tar tank (not marked), and then pumped into a tar storage tank (not marked) as raw material for tar distillation; then these raw materials are input into the blending tank 1 for blending, and then heat exchanged to 1 through the tar light oil heat exchanger 2, the tar naphthalene oil heat exchanger 3, the soft pitch tar heat exchanger 4, and the tar preheater 5 in sequence. 35℃, and then transported to the tar dehydration tower 6 for distillation and dehydration; the water content in the crude tar and a part of the tar light oil are discharged as oil and gas through the top of the tar dehydration tower 6, and are condensed in the condenser arranged on the top of the tar dehydration tower 6 and transported to the first oil-water separator 16 for oil-water separation, wherein the separated wastewater is sent to the wastewater storage tank 18 (after storage, the wastewater is transported to the raw material phenol water tank in the production process for reuse), and the condensed tar light oil flows into the second oil-water separator 17 and is sent to the wastewater storage tank 18, and the light oil obtained is returned to the tar dehydration tower 6 as reflux liquid.

[0023] The dehydrated tar discharged from the bottom of the tar dehydration tower 6 is heat exchanged in the tar / soft pitch heat exchanger 7 and then heated to 330°C in a heating furnace 8. It is then supplied to the atmospheric pressure tower 9 in a gas-liquid mixed phase state and distilled by steam supplied from the bottom of the atmospheric pressure tower 9. The oil vapor escaping from the top of the atmospheric pressure tower 9 is cooled to approximately 40°C in an oil-water cooler 19 and flows into the third oil-water separator 20 for oil-water separation. The separated wastewater is transported to the wastewater storage tank 18 or returned to the oil-water cooler 19 for further cooling. The separated tar light oil then flows by gravity into the fourth oil-water separator 21. The separated water is sent to the wastewater storage tank 18, and the separated oil is refluxed or produced by a tar light oil reflux pump (not shown). The reflux oil is returned from the top of the atmospheric pressure tower to the atmospheric pressure tower for further processing, and the produced oil is sent to the tar light oil storage tank (not shown) for use as light oil for cleaning.

[0024] Phenol oil, naphthalene oil and tar wash oil are extracted from the tower side of the atmospheric tower 9; the phenol oil and naphthalene oil are cooled in the phenol oil / naphthalene oil cooler 22 respectively and sent to the phenol naphthalene mixing tank 23.

[0025] The tar wash oil extracted from the side of the atmospheric tower 9 is distilled again with steam in the side tower 24. The light fraction escapes from the top of the side tower and returns to the atmospheric tower 9. The tar wash oil flowing out of the bottom of the side tower is pumped out, cooled to about 120°C and then sent to the tar wash oil storage tank.

[0026] Soft asphalt is extracted from the bottom of the atmospheric tower 9, cooled to about 130°C through the dehydrated tar / soft asphalt heat exchanger 10 and the soft asphalt / tar heat exchanger 11, and then sent to the soft asphalt storage tank 12.

[0027] After temporary storage, the soft asphalt is pumped to the reactor 13. The reactor 13 is equipped with an electric heating system. After the asphalt is heated to 380°C, hot nitrogen is introduced into the reactor 13. The nitrogen is heated to 400°C by a nitrogen heater and mixed with purified compressed air in proportion at the outlet of the nitrogen heater (the proportion of compressed air is about 20%) before entering the reactor 13 to oxidize the soft asphalt and remove light components. The exhaust gas is sent to the exhaust gas absorption device (not marked) through the exhaust main pipe (not marked). After the reaction is completed, the soft asphalt is discharged from the discharge port at the bottom of the reactor 13 to the asphalt collection box 14; the reaction process takes about 8 hours.

[0028] The asphalt collection box 14 consists of an inner box (for loading) and an outer box (for nitrogen protection), and is equipped with a nitrogen protection device. The material is cooled in the asphalt collection box 14 for 2 to 3 hours. When the temperature drops below 200°C, the inner box is taken out and pushed into the negative electrode material workshop for use.

[0029] It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A device for producing asphalt as a raw material for lithium battery negative electrode materials, characterized by: The system comprises a blending tank, which is connected to a tar light oil heat exchanger, a tar naphthalene oil heat exchanger, a soft pitch tar heat exchanger, a tar preheater and a tar dehydration tower in sequence through a tar pump and a pipeline; the tar dehydration tower is provided with an oil and gas outlet at the top and a dehydrated tar outlet at the bottom, and the dehydrated tar outlet is connected to a tar / soft pitch heat exchanger, a heating furnace and an atmospheric pressure tower in sequence through a pipeline; the atmospheric pressure tower is provided with a clear oil outlet, a phenol oil outlet, a naphthalene oil outlet, a tar wash oil outlet and a soft pitch outlet in sequence from the top to the bottom; The soft asphalt outlet is connected to the dehydrated tar / soft asphalt heat exchanger, the soft asphalt / tar heat exchanger and the soft asphalt storage tank in sequence through a pipeline. The soft asphalt storage tank is connected to the reactor through a pump and a pipeline. The discharge port at the bottom of the reactor is connected to the asphalt collection box through a pipeline.

2. The device for producing asphalt as a raw material for lithium battery negative electrode materials according to claim 1, characterized in that: The mixing tank is provided with a stirring device.

3. The device for producing asphalt as a raw material for lithium battery negative electrode materials according to claim 1, characterized in that: The top of the tar dehydration tower is provided with a condenser, and the bottom is provided with a heater for tar heating circulation.

4. The device for producing asphalt as a raw material for lithium battery negative electrode materials according to claim 1, characterized in that: The oil and gas outlet of the tar dehydration tower is connected back to the tar dehydration tower through a pipeline and the first oil-water separator and the second oil-water separator connected thereto, and the water outlet of the first oil-water separator is connected to the wastewater storage tank.

5. The device for producing asphalt as a raw material for lithium battery negative electrode materials according to claim 1, characterized in that: The clean oil outlet of the atmospheric pressure tower is connected to an oil-water cooler, a third oil-water separator and a fourth oil-water separator in sequence through a pipeline. The water outlet of the third oil-water separator is connected to an oil-water cooler and a wastewater storage tank respectively through a pump and a pipeline, and the oil outlet of the fourth oil-water separator is back-connected to the atmospheric pressure tower through a pipeline and a pump; the phenol oil outlet and the naphthalene oil outlet of the atmospheric pressure tower are respectively connected to a phenol-naphthalene mixing tank through a phenol oil / naphthalene oil cooler; the tar wash oil outlet of the atmospheric pressure tower is connected to a side tower through a pipeline, a return pipeline is provided in the middle of the side tower to connect back to the atmospheric pressure tower, and a discharge port at the bottom of the side tower is connected to a tar wash oil storage tank; a steam inlet is also provided on one side of the bottom of the tower body of the atmospheric pressure tower and the side tower respectively.

6. The device for producing asphalt as a raw material for lithium battery negative electrode materials according to claim 1, characterized in that: The reactor is provided with an electric heating system, and a flow meter and a shut-off valve are provided at the material inlet of the reactor. The flow meter, the shut-off valve and the electric heating system are interlocked and controlled with each other. The reactor is also provided with a gas inlet, which is connected to a nitrogen heater and a purified compressed air pump respectively through a gas mixer. The nitrogen heater and the purified compressed air pump are connected to a nitrogen storage tank and a purified compressed air storage tank respectively through pipelines. An exhaust gas outlet is provided at the top of the reactor, and the exhaust gas outlet is connected to an exhaust gas absorption device through an exhaust gas main pipe.

7. The device for producing asphalt as a raw material for lithium battery negative electrode materials according to claim 1, characterized in that: The asphalt collection box is provided with an inner box and an outer box, and both the inner box and the outer box are provided with corresponding feed ports; a box door is provided on one side of the outer box, and a sealing ring is provided around the box door; a slide rail for pushing the inner box is provided at the bottom inner side of the outer box, and a hydraulic jack is also provided to tightly connect the upper part of the inner box with the upper part of the outer box through a sealing ring; the inner box and the outer box are both provided with nitrogen replacement valves, and the nitrogen replacement valves are connected to the nitrogen supply device outside the box through a pipeline.

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