Continuous separation equipment for mesophase pitch

Abstract

The utility model provides continuous separation equipment for mesophase pitch. The continuous separation equipment comprises a cone tank, a heating medium jacket, a stirrer and equipment supporting legs, a material inlet is formed in the middle of the equipment body, discharge ports are formed in the top and the bottom of the equipment body respectively, and the heating medium jacket is provided with a heating medium inlet and outlet; according to the continuous separation equipment for the mesophase pitch provided by the utility model, light liquid is forced to gather upwards and heavy liquid is forced to gather downwards under a specific taper in a high-speed rotation process after materials enter the cone centrifugal machine, and the density difference between the mesophase pitch and pitch with the same polarity is utilized to separate the mesophase pitch from the cone centrifugal machine. And separating the two kinds of pitch from the polymer liquid in the molten state by utilizing a centrifugal principle to obtain the high-purity mesophase pitch.

Description

Technical Field

[0001] This utility model relates to the field of mesophase asphalt production technology, specifically to a continuous separation device for mesophase asphalt. Background Technology

[0002] Mesophase pitch is a precursor for the preparation of high-performance pitch-based carbon fibers, mesophase carbon microspheres, needle coke and other advanced carbon materials. High-performance carbon materials require mesophase pitch to have characteristics such as high aromaticity, low ash content and narrow molecular weight distribution.

[0003] Traditional methods for preparing mesophase pitch are mostly two-step processes. First, a polymerization solution is obtained through thermal condensation or catalytic polymerization, containing mesophase pitch and homopolymer pitch with a low degree of polymerization. Then, the homopolymer pitch is removed by negative pressure flash evaporation to obtain the mesophase pitch. This method of preparing mesophase pitch suffers from drawbacks because the homopolymer pitch has an extremely high boiling point, requiring flash evaporation temperatures often reaching 380–420°C or even higher. At these temperatures, the polymerization solution is prone to cracking and coking, resulting in the formation of large amounts of pores and secondary quinoline insolubles in the mesophase pitch. This significantly hinders the subsequent spinning process and severely impacts the production process and mechanical property stability of mesophase pitch-based carbon fibers. Therefore, effectively separating the mesophase pitch from the homopolymer pitch in the polymerization solution without causing cracking and coking is the core technical challenge in mesophase pitch preparation. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a continuous separation device for mesophase pitch, and the technical solution to solve the technical problems is as follows:

[0005] A continuous separation device for mesophase pitch includes a conical tank, a heat transfer jacket, a stirrer, a motor cooling jacket, and centrifuge legs.

[0006] The height of the conical tank is 0.5-2m, preferably 0.8-1.5m, the bottom diameter is 1-3m, preferably 1.5-2.5m, the upper diameter is 0.5-1.5m, preferably 0.8-1.2m, and the cone angle is 30-70 degrees, preferably 45-60 degrees. The material inlet of the conical tank is located in the middle of the machine body, the light liquid outlet is located at the upper part near the central stirring shaft, and the heavy liquid outlet is located at the bottom edge.

[0007] The heat medium in the heat medium jacket enters the equipment through the heat medium inlet and flows out through the heat medium outlet; the heat medium jacket is equipped with baffles; the heat medium can be, but is not limited to, high-pressure steam, high-temperature heat transfer oil, or molten salt.

[0008] The agitator is equipped with a two-stage explosion-proof variable frequency motor with a maximum speed of 3000 r / min. The agitator blades are radial flow blades, such as inclined blades or propellers, with 2 to 7 blade layers, preferably 3 to 6 layers. The blade layers are equidistant and evenly distributed along the axial direction. The distance between the blades and the tank wall is equidistant and arranged in a trapezoidal shape. The ratio of the blade length to the diameter of the cone at its height is 1 / 4 to 2 / 3, preferably 1 / 3 to 1 / 2.

[0009] The upper part of the machine body is equipped with a motor cooling jacket, and circulating water enters from the refrigerant inlet and returns to the circulating water pipeline from the refrigerant outlet.

[0010] The equipment has four support legs, and the height of each support leg can be adjusted up and down.

[0011] This utility model has the following beneficial effects:

[0012] This invention features a scientifically sound and reasonable structure. The polymer liquid (a mixture of mesophase asphalt and homogeneous asphalt) is pumped to a conical centrifuge. Under centrifugal force, the less dense homogeneous asphalt flows out from the top outlet of the centrifuge, while the denser mesophase asphalt flows out from the bottom. Due to the low operating temperature (200–350°C, sufficient to ensure good fluidity of the polymer liquid), cracking and coking phenomena occurring during high-temperature separation of mesophase asphalt are avoided, and continuous separation of mesophase asphalt is achieved. The application of this invention in the preparation of mesophase asphalt solves the problems of high porosity and high content of secondary quinoline insolubles in the mesophase asphalt resulting from traditional negative pressure flash evaporation separation. This significantly improves the product quality of mesophase asphalt, and the continuous separation of mesophase asphalt greatly increases production efficiency and saves production costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] The components include: 1. Conical tank; 2. Heat medium jacket; 3. Agitator; 4. Motor cooling jacket; 5. Centrifuge support legs; 11. Material inlet; 12. Heavy liquid outlet; 13. Light liquid outlet; 21. Heat medium inlet; 22. Heat medium outlet; 23. Baffle plate; 31. Agitator motor; 32. Agitator paddle; 41. Refrigerant inlet; 42. Refrigerant outlet. Detailed Implementation

[0015] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0016] A continuous separation device for mesophase asphalt includes a conical tank (1), a heat transfer jacket (2), a stirrer (3), a motor cooling jacket (4), and centrifuge legs (5).

[0017] The height of the conical tank (1) is 0.5-2m, preferably 0.8-1.5m, the bottom diameter is 1-3m, preferably 1.5-2.5m, the upper diameter is 0.5-1.5m, preferably 0.8-1.2m, the cone angle is 30-70 degrees, preferably 45-60 degrees, the material inlet (11) of the conical tank (1) is located in the middle of the machine body, the light liquid outlet (13) is located at the upper part near the central stirring shaft, and the heavy liquid outlet (12) is located at the bottom edge.

[0018] The heat medium in the heat medium jacket (2) enters the equipment through the heat medium inlet (21) and flows out through the heat medium outlet (22); the heat medium jacket (2) is equipped with a baffle plate (23); the heat medium can be, but is not limited to, high-pressure steam, high-temperature heat transfer oil, or molten salt.

[0019] The stirring motor (31) of the stirrer (3) is a two-stage explosion-proof variable frequency motor with a maximum speed of 3000 r / min. The stirring blade (32) of the stirrer (3) adopts a radial flow blade, such as a slanted blade or a propeller. The number of blade layers is 2 to 7, preferably 3 to 6. The blade layers are equidistant and evenly distributed along the axial direction. The distance between the blade layers and the tank wall is equidistant and arranged in a trapezoidal shape. The length of the blade is 1 / 4 to 2 / 3 of the diameter of the cone at its height, preferably 1 / 3 to 1 / 2.

[0020] The equipment support legs (5) consist of four legs, and the height of each support leg can be adjusted up and down.

[0021] During production, the polymer solution obtained through thermal polycondensation or catalytic polymerization is placed in a polymer solution buffer tank for later use.

[0022] By adjusting the height of the support legs (5), the cone centrifuge (1) is brought to a horizontal position and the support legs (5) are locked. The refrigerant inlet and outlet valves of the motor cooling jacket (4) are opened. The heat medium inlet (21) valve of the reactor centrifuge (1) is opened, and the reactor centrifuge (1) is preheated for 30 minutes by controlling the opening of the outlet valve (22). The heat medium temperature is the material centrifugation temperature +10℃. Then the stirring motor (31) of the reactor centrifuge is started. The stirring motor (32) speed is gradually adjusted to the specified speed by the frequency converter. The polymer liquid is pumped into the cone centrifuge (2) through the middle feed port by the oil pump. The homogeneous asphalt from the top light liquid outlet (13) enters the homogeneous asphalt recovery tank for later use. The mesophase asphalt from the bottom heavy liquid outlet (12) enters the asphalt granulation system. The mesophase asphalt produced in this way has a quinoline insoluble content of 5-20% and the solid asphalt is free of pores.

[0023] The above embodiments do not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A continuous mesophase pitch separation apparatus, characterized by, It includes a conical tank (1), a heat medium jacket (2), a stirrer (3), a motor cooling jacket (4), and centrifuge legs (5); the height of the conical tank (1) is 0.5-2 m, the bottom diameter is 1-3 m, the upper diameter is 0.5-1.5 m, the taper angle of the conical body is 30-70 degrees, the material inlet (11) of the conical tank (1) is located in the middle of the machine body, the light liquid outlet (13) is located in the upper part near the central stirring shaft, and the heavy liquid outlet (12) is located at the bottom edge; the stirring motor (31) of the stirrer (3) has a maximum speed of 3000 r / min; the form of the stirring paddle (32) of the stirrer (3) is radial flow paddle, which can be inclined paddle or propeller paddle; the paddle layer is 2-7 layers; the paddle layers are equidistantly distributed along the axial direction; the distance between the paddle and the tank wall is equidistant; the paddle is in trapezoidal distribution; the length of the paddle is 1 / 4-2 / 3 of the height of the conical body; under the action of centrifugal force, the asphalt with small density flows out from the upper outlet of the centrifuge, and the asphalt with large density flows out from the bottom.

2. An apparatus for continuous isolation of mesophase pitch according to claim 1, characterized in that, The heat medium of the heat medium jacket (2) enters the equipment from the heat medium inlet (21) and flows out from the heat medium outlet (22); the baffle (23) is arranged in the heat medium jacket (2); the heat medium medium is high-pressure steam, high-temperature heat-conducting oil, or molten salt.

3. An apparatus for continuous isolation of mesophase pitch according to claim 1, wherein The stirring motor (31) of the stirrer (3) is a two-stage explosion-proof variable frequency motor.

4. An apparatus for continuous isolation of mesophase pitch according to claim 1, wherein The upper part of the machine body is provided with the motor cooling jacket (4), and circulating water enters from the coolant inlet (41) and returns to the circulating water pipe network from the coolant outlet (42).

5. A continuous mesophase pitch separation apparatus according to claim 1, wherein The centrifuge legs (5) are four, and each centrifuge leg (5) can be adjusted in height.

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