Continuous circulation polymerization distillation device for preparing mesophase pitch

Abstract

The utility model discloses a continuous circulation polymerization distillation device for preparing mesophase pitch. Relates to the field of mesophase pitch preparation. Comprising a raw material tank, a main oil pump, a heating furnace I, a thermal polymerization reactor, a flash tank, a reduced pressure distillation tower, a heating furnace II, a stirring tank, a hydrogenation tower, a separation former and a communicating pipeline, raw oil is stored in the raw material tank; the main oil pump is suitable for pumping raw oil into the thermal polymerization reactor; a control valve group is arranged between the flash tank and the reduced pressure distillation tower, an oil quality detection pipeline and a return pipeline are connected between the flash tank and the reduced pressure distillation tower, and the return pipeline is suitable for being communicated with the heating furnace I. According to the utility model, the oil quality detection pipeline and the return pipeline are additionally arranged to detect the product of the thermal polymerization reactor, so that the content of coal pitch generated by raw oil can be conveniently controlled.

Description

Technical Field

[0001] The utility model relates to the field of preparation of mesophase bitumen, and in particular to a continuous cycle polymerization distillation device for preparing mesophase bitumen. Background Art

[0002] Asphalt mesophase is a mixture of various flat disc-shaped polycyclic aromatic hydrocarbons with relative molecular mass of 370 to 2000, also known as liquid crystal phase asphalt. Generally, substances present optical anisotropy in the crystalline state and optical isotropy in the liquid state; however, there is a class of substances that present an optically anisotropic turbid fluid state in the intermediate stage of the process from crystal to liquid, which is both in liquid form and has the optical anisotropy characteristics of crystals. It is called liquid crystal in crystallography and mesophase in phasology.

[0003] Coal tar is a black or black-brown viscous liquid with a harsh smell generated during coal distillation.

[0004] Coal tar is a kind of artificial asphalt, generally in the form of viscous liquid, semi-solid or solid. It is black and shiny. Coal tar is the residue after the liquid fraction is removed from the distillation of coal tar, accounting for about 50% to 60% of the total amount of coal tar.

[0005] In the prior art, coal tar is often used to prepare coal tar in the preparation of mesophase asphalt, and the coal tar is heated and distilled to obtain the mesophase asphalt. Usually, it is heated to a polymerization reaction and then directly distilled under reduced pressure to distinguish between oil and asphalt with different boiling points. As a result, the content of the polymerization reaction in the raw material determines the asphalt content. Therefore, it is very necessary to set up a circulation pipeline and a detection pipeline to determine the content formed by the output.

[0006] In view of this, the present utility model is proposed. Utility Model Content

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0008] In view of the shortcomings of the prior art, the utility model provides a machine tool with a gantry with iron filing recycling function. The specific technical solutions are as follows:

[0009] A continuous circulation polymerization distillation device for preparing mesophase asphalt, comprising a raw material tank, a main oil pump, a first heating furnace, a thermal polymerization reactor, a flash tank, a vacuum distillation tower, a second heating furnace, a stirring tank, a hydrogenation tower, a separation molding device and a connecting pipeline;

[0010] The raw material tank stores raw oil; the main oil pump is suitable for pumping raw oil into the thermal polymerization reactor; a control valve group is arranged between the flash tank and the vacuum distillation tower, and is connected with an oil quality detection pipeline and a return pipeline, and the return pipeline is suitable for being connected to the heating furnace.

[0011] In a further technical solution, the raw material tank is connected to one end of the main oil pump, and the other end of the main oil pump is connected to the heating furnace 1; the heating furnace 1 is connected to the thermal polymerization reactor; the thermal polymerization reactor is connected to the flash tank, and the connecting pipeline is a high-pressure pipeline;

[0012] The control valve group includes a main ball valve located on the high-pressure pipeline, and a bypass 1 is arranged on one side of the high-pressure pipeline, and the bypass 1 is connected to the oil quality detection pipeline; a bypass 2 is installed on the other side of the high-pressure pipeline, and the upper setting of the bypass 2 is connected to the return pipeline;

[0013] A check valve is installed on both the bypass 1 and bypass 2;

[0014] The outlet of the vacuum distillation tower is provided with an outlet 1, and the outlet 1 is connected to the heating furnace 2; the heating furnace 2 is connected to the stirring tank, and a connecting pipe is arranged at the bottom of the stirring tank and is connected to the hydrogenation tower; the hydrogenation tower is connected to the separation molding device.

[0015] In a further technical solution, the separation molder includes a flash evaporator and a reaction molder, which is in communication with the bottom of the hydrogenation tower.

[0016] In a further technical solution, the return pipe is equipped with a gate valve and an acceleration oil pump, which is adapted to control the return pipe to be opened and the acceleration oil pump is in communication with the return pipe.

[0017] In a further technical solution, a second gate valve, a pressure reducing valve and a sampling valve are installed on the oil quality detection pipeline, and the second gate valve, the pressure reducing valve and the sampling valve are arranged in sequence; the pressure reducing valve is suitable for reducing the pressure of the oil quality detection pipeline.

[0018] In a further technical solution, the main ball valve, gate valve one and gate valve two are solenoid valves.

[0019] In a further technical solution, the stirring tank comprises a stirring tank shell, a heat insulation layer is provided in the stirring tank shell, the stirring tank shell is arranged horizontally, and a support frame is provided on the outside;

[0020] A transverse shaft is provided on the inner side of the stirring tank housing, and a stirring blade is provided on the transverse shaft;

[0021] Both ends of the transverse shaft extend out of the agitating tank housing and a support frame is installed, and the support frame is rotatably connected to the transverse shaft;

[0022] An interface ring is provided on the transverse shaft, and a rotary gear is fixedly installed outside the interface ring;

[0023] A protective cover is installed outside the slewing gear, and a driving gear is installed at the bottom of the slewing gear, and the driving gear is meshed with the slewing gear;

[0024] A drive motor is installed on the outside of the drive gear, and the output end of the drive motor is arranged coaxially with the drive gear, and the drive motor is adapted to drive the rotary gear to rotate.

[0025] In a further technical solution, the stirring leaves are provided with multiple groups and are bent, and flow holes are provided at the bends.

[0026] Beneficial effects:

[0027] 1. The utility model detects the oil in the connecting pipe by setting up an oil quality detection pipeline to ensure that the content of the product formed in the polymerization reaction is high. The oil is detected and it is necessary to perform secondary heating and polymerization reaction through the return pipeline. By adding an oil quality detection pipeline and a return pipeline, the product of the thermal polymerization reactor is detected to improve the content of coal tar produced by the raw oil and obtain more mesophase asphalt.

[0028] 2. The utility model stirs through a horizontal stirring tube, and a support frame is provided to support the two ends of the horizontal shaft. A driving motor is provided to drive the driving gear to drive the rotary gear to rotate. The shaft of the driving gear is fixed in the protective cover to form a more rigorous stirring method. The stirring blade is provided with a flow hole to ensure that the coal tar and oil formed after heating in the vacuum distillation tower are stirred and the hydrogen supply agent is added, so as to facilitate the hydrogenation reaction in the hydrogenation tower extraction tank, and then the reaction is formed by the reaction former. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] In the attached picture:

[0031] Figure 1 A system diagram of a continuous cycle polymerization distillation device according to Embodiment 1 of the present invention;

[0032] Figure 2 for Figure 1 Schematic diagram of M;

[0033] Figure 3 It is a schematic diagram of the stirring tank according to Embodiment 2 of the present invention;

[0034] Figure 4 It is a structural diagram of the stirring tank of the utility model;

[0035] Figure 5 It is a side view of the stirring blade of the present utility model.

[0036] In the figure: 1. raw material tank; 2. main oil pump; 3. heating furnace 1; 4. thermal polymerization reactor; 5. flash tank; 6. vacuum distillation tower; 7. heating furnace 2; 8. stirring tank; 9. hydrogenation tower; 10. separation molder; 11. connecting pipeline; 12. main ball valve; 13. oil quality detection pipeline; 14. return pipeline; 15. check valve; 17. flash tower; 18. gate valve 1; 19. acceleration oil pump; 20. gate valve 2; 21. pressure reducing valve; 22. sampling valve; 23. stirring tank shell; 26. horizontal shaft; 27. stirring blade; 28. support frame; 29. ​​rotary gear; 30. protective cover; 31. driving gear; 32. driving motor; 33. flow hole. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0038] The application principle of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] like Figure 1-2 As shown, it is an embodiment of the utility model, a continuous circulation polymerization distillation device for preparing mesophase asphalt, comprising a raw material tank 1, a main oil pump 2, a heating furnace 1 3, a thermal polymerization reactor 4, a flash tank 5, a vacuum distillation tower 6, a heating furnace 2 7, a stirring tank 8, a hydrogenation tower 9, a separation molding device 10 and a connecting pipeline 11;

[0041] The raw material tank 1 stores raw oil; the main oil pump 2 is suitable for pumping the raw oil into the thermal polymerization reactor 4; a control valve group is provided between the flash tank 5 and the vacuum distillation tower 6, and is connected with an oil quality detection pipeline 13 and a return pipeline 14, and the return pipeline 14 is suitable for being connected to the heating furnace 3.

[0042] The raw material tank 1 is connected to one end of the main oil pump 2, and the other end of the main oil pump 2 is connected to the heating furnace 3; the heating furnace 3 is connected to the thermal polymerization reactor 4; the thermal polymerization reactor 4 is connected to the flash tank 5, and the connecting pipe 11 is a high-pressure pipe;

[0043] The feedstock oil is coal tar or a heavy oil product rich in polycyclic aromatic hydrocarbons, ensuring that its polycyclic aromatic hydrocarbon content is greater than 80wt%; it is selected from one or a mixture of low-temperature, medium-temperature, and high-temperature coal tars of catalytic slurry, furfural extracted oil, and coal chemical by-products. It is heated to 470-500°C by a heating furnace 3. The thermal polymerization reactor 4 can further be a high-pressure reactor, in which hydrocarbon cracking reactions and aromatic polymerization reactions occur simultaneously. The hydrocarbon cracking reaction is endothermic, and the aromatic polymerization reaction is exothermic. Preliminary experimental studies have shown that the reaction in the autoclave is generally endothermic, and heat needs to be added in time to maintain a constant temperature. In order to maintain the reaction temperature, the thermal polymerization reactor 4 can be equipped with a heating component or a constant temperature component to maintain the temperature. The reaction residence time is 6-24 hours, which is conducive to the fusion of the mesophase spheres. The low temperature and long residence time are conducive to the growth of the mesophase molecular crystal structure, and the quality of the prepared mesophase asphalt is better. The material at the bottom of the vacuum distillation tower 6 is sent to the heating furnace 2 for short residence time thermal conversion. The outlet temperature of the heating furnace 2 is 460-480°C, and the residence time in the heating furnace 2 is 4 minutes to ensure decompression. The vacuum distillate oil obtained by the vacuum distillation tower 6 is sent to the radiation section of the heating furnace 2 for heating, and different products such as light oil, phenol oil, Cai oil, washing oil, and Hui oil are obtained, which are product A. The part discharged from the bottom of the tower is coal tar. After entering the stirring, the hydrogen supply agent is added, and it enters the hydrogenation tower for hydrogenation reaction, and reacts with impurities such as sulfur and nitrogen in the raw oil, and hydrogen to generate corrosive hydrogen sulfide and ammonia. After passing through the flash tower 17 and dropping to 220-240°C, it is passed into the reaction forming device, wherein the reaction forming device is passed into gas B, gas B can be nitrogen or hydrogen, and the nitrogen can be passed into granulation forming; the hydrogen can be passed into the heat sensitization reaction to obtain the intermediate phase asphalt, which is product C.

[0044] like Figure 2 As shown, the control valve group includes a main ball valve 12 located on the high-pressure pipeline, and a bypass 1 is provided on one side of the high-pressure pipeline, and the bypass 1 is connected to the oil quality detection pipeline 13; a bypass 2 is installed on the other side of the high-pressure pipeline, and the upper part of the bypass 2 is connected to the return pipeline 14; a check valve 15 is installed on both the bypass 1 and the bypass 2; the outlet of the vacuum distillation tower 6 is provided with an outlet 1, and the outlet 1 is connected to the heating furnace 2 7; the heating furnace 2 7 is connected to the stirring tank 8, and a pipeline is provided at the bottom of the stirring tank 8 and is connected to the hydrogenation tower 9; the hydrogenation tower 9 is connected to the separation molding device 10. The separation molding device 10 includes a flash tower 17 and a reaction molding device.

[0045] The return pipe 14 is equipped with a gate valve 18 and an acceleration oil pump 19. The gate valve 18 is suitable for controlling the opening and closing of the return pipe 14. The acceleration oil pump 19 is connected to the return pipe 14. The oil quality detection pipe 13 is equipped with a gate valve 20, a pressure reducing valve 21 and a sampling valve 22. The gate valve 20, the pressure reducing valve 21 and the sampling valve 22 are arranged in sequence; the pressure reducing valve 21 is suitable for reducing the pressure of the oil quality detection pipe 13. The main ball valve 12, the gate valve 18 and the gate valve 20 are all electromagnetic valves. The main ball valve can be a Q941F electric flange ball valve. The gate valve is a Z941 H or Z941W electric gate valve, and the pipe diameter is adapted.

[0046] An oil quality detection pipeline 13 is provided to detect the oil in the connecting pipeline to ensure that the product content formed in the polymerization reaction is high. The oil is detected and necessary secondary heating and polymerization reaction are carried out through the return pipeline.

[0047] Example 2

[0048] like Figures 3 to 5 As shown, it is another embodiment of the present utility model. On the basis of Example 1, the stirring tank 8 includes a stirring tank shell 23. A heat insulation layer is arranged inside the stirring tank shell 23, the stirring tank shell 23 is arranged horizontally, and a support frame is arranged outside;

[0049] like Figure 4 As shown, a transverse shaft 26 is provided on the inner side of the stirring tank shell 23, and a stirring blade 27 is provided inside the transverse shaft 26; both ends of the transverse shaft 26 extend out of the stirring tank shell 23 and are installed with a support frame 28, and the support frame 28 is rotatably connected with the transverse shaft 26; an interface ring is provided on the transverse shaft 26, and a rotating gear 29 is fixedly installed outside the interface ring; a protective cover 30 is installed outside the rotating gear 29, and a driving gear 31 is installed at the bottom of the protective cover 30, and the driving gear 31 is meshed with the rotating gear 29; a driving motor 32 is installed outside the driving gear 31, and the output end of the driving motor 32 is coaxially arranged with the driving gear 31, and the driving motor 32 is suitable for driving the rotating gear 29 to rotate.

[0050] The stirring blades 27 are arranged in multiple groups and are bent, and the bending part is provided with a flow hole 33. The utility model stirs by means of a horizontal stirring tank shell 23, and a support frame 28 is provided to support the two ends of the horizontal shaft 26, and a driving motor is provided to drive a driving gear 31 to drive the rotary gear to rotate, and the shaft of the driving gear is fixed in a protective cover 29.

[0051] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A continuous circulation polymerization distillation device for preparing mesophase pitch, characterized in that: It comprises a raw material tank (1), a main oil pump (2), a heating furnace 1 (3), a thermal polymerization reactor (4), a flash tank (5), a vacuum distillation tower (6), a heating furnace 2 (7), a stirring tank (8), a hydrogenation tower (9), a separation molding device (10) and a connecting pipeline (11); The raw material tank (1) stores raw material oil; the main oil pump (2) is suitable for pumping the raw material oil into the thermal polymerization reactor (4); a control valve group is provided between the flash tank (5) and the vacuum distillation tower (6), and is connected with an oil quality detection pipeline (13) and a return pipeline (14), and the return pipeline (14) is suitable for being connected to the heating furnace (3).

2. A continuous circulation polymerization distillation device for preparing mesophase pitch according to claim 1, characterized in that: The raw material tank (1) is connected to one end of the main oil pump (2), and the other end of the main oil pump (2) is connected to the heating furnace (3); the heating furnace (3) is connected to the thermal polymerization reactor (4); the thermal polymerization reactor (4) is connected to the flash tank (5), and the connecting pipe (11) is a high-pressure pipe; The control valve group comprises a main ball valve (12) located on the high-pressure pipeline, and a bypass 1 is arranged on one side of the high-pressure pipeline, and the bypass 1 is connected to the oil quality detection pipeline (13); a bypass 2 is installed on the other side of the high-pressure pipeline, and the upper part of the bypass 2 is connected to the return pipeline (14); Both the bypass 1 and the bypass 2 are provided with a one-way valve (15); The outlet of the vacuum distillation tower (6) is provided with an outlet 1, and the outlet 1 is connected to the heating furnace 2 (7); the heating furnace 2 (7) is connected to the stirring tank (8), and a connecting pipe is provided at the bottom of the stirring tank (8) and is connected to the hydrogenation tower (9); the hydrogenation tower (9) is connected to the separation molding device (10).

3. A continuous circulation polymerization distillation device for preparing mesophase pitch according to claim 2, characterized in that: The separation former (10) comprises a flash tower (17) and a reaction former, and the flash tower (17) is connected to the bottom of the hydrogenation tower (9).

4. A continuous circulation polymerization distillation device for preparing mesophase pitch according to claim 3, characterized in that: A gate valve 1 (18) and an acceleration oil pump (19) are installed on the return pipeline (14). The gate valve 1 (18) is suitable for controlling the opening and closing of the return pipeline (14). The acceleration oil pump (19) is connected to the return pipeline (14).

5. The continuous circulation polymerization distillation device for preparing mesophase pitch according to claim 3, characterized in that: The oil quality detection pipeline (13) is provided with a second gate valve (20), a pressure reducing valve (21) and a sampling valve (22), wherein the second gate valve (20), the pressure reducing valve (21) and the sampling valve (22) are arranged in sequence; the pressure reducing valve (21) is suitable for reducing the pressure of the oil quality detection pipeline (13).

6. The continuous circulation polymerization distillation device for preparing mesophase pitch according to claim 3, characterized in that: The main ball valve (12), gate valve one (18) and gate valve two (20) are all electromagnetic valves.

7. The continuous circulation polymerization distillation device for preparing mesophase pitch according to claim 3, characterized in that: The stirring tank (8) comprises a stirring tank shell (23), a heat insulation layer is arranged inside the stirring tank shell (23), the stirring tank shell (23) is arranged horizontally, and a support frame is arranged outside; A transverse shaft (26) is arranged on the inner side of the stirring tank shell (23), and a stirring blade (27) is arranged inside the transverse shaft (26); Both ends of the transverse shaft (26) extend out of the mixing tank shell (23) and are equipped with support frames (28), and the support frames (28) are rotatably connected to the transverse shaft (26); An interface ring is arranged on the transverse shaft (26), and a rotary gear (29) is fixedly mounted outside the interface ring; A protective cover (30) is installed outside the rotary gear (29), and a driving gear (31) is installed at the bottom of the protective cover (30), and the driving gear (31) is meshed with the rotary gear (29); A driving motor (32) is installed outside the driving gear (31), and an output end of the driving motor (32) is coaxially arranged with the driving gear (31). The driving motor (32) is suitable for driving the rotary gear (29) to rotate.

8. A continuous circulation polymerization distillation device for preparing mesophase pitch according to claim 7, characterized in that: The stirring blades (27) are arranged in multiple groups and are bent, and a flow hole (33) is arranged at the bent position.

Images