Device for preparing mesophase pitch from hydrogenation tail oil of medium and low temperature coal tar
By connecting a nitrogen conveying mechanism to prepare mesophase asphalt on the device for hydrogenation tail oil of medium and low temperature coal tar, the problems of complex preparation process and low production efficiency in the prior art are solved, and high-quality preparation of mesophase asphalt is achieved. High content, suitable softening point, and low ash content.
Patent Information
- Application Number
- CN202421211652.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the prior art, the preparation process device for mesophase asphalt is complex and has low production efficiency, resulting in unstable product quality.
A device for preparing mesophase asphalt for medium and low temperature coal tar hydrogenation tail oil is designed. By connecting a nitrogen transport mechanism to the reactor, nitrogen is continuously input into the reactor, thereby promoting the promotion of reaction raw materials and improving reaction efficiency.
The preparation efficiency of mesophase asphalt is improved, the intermediate phase content of the product reaches 95-98%, the softening point is between 80-190℃, and the ash content is between 0.01-0.05%, which significantly improves the product quality.
Smart Images
Figure CN222427999U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of coal chemical industry, and specifically relates to a device for preparing mesophase asphalt by hydrogenating tail oil of medium-low temperature coal tar. Background Art
[0002] Mesophase pitch is a high-grade raw material for preparing high-quality new carbon materials. It has the characteristics of low cost, high carbonization yield and excellent processing performance, and is widely used in the preparation of high-end carbon materials. For example, mesophase pitch-based carbon fibers, mesophase carbon microspheres, mesophase pitch-based foamed carbon and needle coke products play an important role in aerospace, national defense, military industry and new energy.
[0003] In the prior art, mesophase asphalt is mostly prepared from coal tar asphalt, petroleum asphalt and other heavy oils. This is because it not only has a lower raw material cost, but also provides a way to efficiently utilize heavy asphalt. However, due to the complexity and diversity of these heavy raw materials themselves, they have the disadvantages of relatively complex preparation process equipment and low production efficiency. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a device for preparing mesophase asphalt from medium- and low-temperature coal tar hydrogenation tail oil, which has a reasonable design, high efficiency and high quality of prepared mesophase asphalt.
[0005] The technical solution adopted to solve the above technical problems is: a device for preparing intermediate phase asphalt from medium and low temperature coal tar hydrogenation tail oil, the air inlet pipe of the reactor group is connected to a nitrogen delivery mechanism, the feed pipe of the reactor group is connected to the output pipe of the raw material tank through a delivery pump, the product output pipe of the reactor group is connected to the feed port of the product tank through a pipeline, the light component output pipe of the reactor group is connected to the input pipe of the condensation mechanism through a pipeline, and the exhaust pipe of the condensation mechanism is connected to the alkali washing tank through a pipeline.
[0006] As a preferred technical solution, the reactor group consists of two reactors connected in parallel.
[0007] As a preferred technical solution, the reactor is provided with an air inlet pipe, an electric stirrer and a feed pipe on the top of the reactor tank, and a product output pipe is installed on the bottom. The lower end of the air inlet pipe is connected to a nitrogen distributor. The nitrogen distributor and the stirring rod of the electric stirrer are located in the reactor tank. A heater and an insulation layer are sequentially arranged on the outer wall of the reactor tank from the inside to the outside.
[0008] As a preferred technical solution, the nitrogen distributor is an annular tube provided with evenly distributed distribution holes, and the nitrogen distributor is located below the stirring rod and close to the bottom of the reactor tank.
[0009] As a preferred technical solution, the heater is an electric heater.
[0010] As a preferred technical solution, the condensing mechanism is composed of a primary heat exchanger, a primary condenser, and a secondary condenser which are connected in sequence.
[0011] As a preferred technical solution, the nitrogen delivery mechanism includes a nitrogen front buffer tank, a nitrogen compressor, a nitrogen rear buffer tank, and a nitrogen heater, and the nitrogen front buffer tank, the nitrogen compressor, the nitrogen rear buffer tank, and the nitrogen heater are connected in sequence through pipelines.
[0012] The beneficial effects of the utility model are as follows:
[0013] The utility model is connected to a reactor with a nitrogen delivery mechanism, through which nitrogen is continuously input into the reactor, and the nitrogen acts on the reaction raw materials, so that the reaction raw materials are continuously blown, and light components in the raw materials are blown out, which is beneficial to the formation of high-quality products, and at the same time promotes the reaction, provides pressure for the reactor tank, ensures the stability of the system pressure, and thus improves the reaction efficiency.
[0014] The wide-area mesophase asphalt prepared by the utility model has an mesophase content of 95-98%, a softening point of 80-190°C, and an ash content of 0.01-0.05%, and has the advantage of high product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model.
[0016] Figure 2 It is a structural schematic diagram of a reaction kettle of the utility model.
[0017] Figure 3 It is a structural schematic diagram of the nitrogen distributor 45 of the utility model.
[0018] Among them: raw material tank 1, delivery pump 2, product tank 3, reactor 4, electric stirrer 41, reactor tank 42, heater 43, insulation layer 44, nitrogen distributor 45, nitrogen front buffer tank 5, nitrogen compressor 6, nitrogen rear buffer tank 7, primary heat exchanger 8, first-stage condenser 9, second-stage condenser 10, alkali washing tank 11, nitrogen heater 12. DETAILED DESCRIPTION
[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.
[0020] exist Figure 1 , 2In the device for preparing mesophase asphalt from low-temperature coal tar hydrogenation tail oil of this embodiment, the air inlet pipe of the reactor group is connected with a nitrogen delivery mechanism, the feed pipe of the reactor group is connected with the output pipe of the raw material tank 1 through the delivery pump 2, the product output pipe of the reactor group is connected with the feed port of the product tank 3 through a pipeline, the light component output pipe of the reactor group is connected with the input pipe of the condensation mechanism through a pipeline, and the exhaust pipe of the condensation mechanism is connected with the alkali washing tank 11 through a pipeline. The alkali washing tank is used to remove acidic gas from the light component.
[0021] The nitrogen delivery mechanism of this embodiment includes a nitrogen front buffer tank 5, a nitrogen compressor 6, a nitrogen rear buffer tank 7, and a nitrogen heater 12. The nitrogen front buffer tank 5, the nitrogen compressor 6, the nitrogen rear buffer tank 7, and the nitrogen heater 12 are sequentially connected through pipelines, and the output port of the nitrogen rear buffer tank 7 is connected to the air inlet pipe of the reactor group through a pipeline. The nitrogen delivery mechanism is used to provide a stable constant pressure nitrogen flow into the reactor 4.
[0022] The reactor group of this embodiment is composed of two reactors 4 connected in parallel. The structure of the reactor 4 is that an air inlet pipe, an electric stirrer 41 and a feed pipe are installed on the top of the reactor tank 42, and a product output pipe is installed at the bottom. The lower end of the air inlet pipe is connected to a nitrogen distributor 45. The nitrogen distributor 45 and the stirring rod of the electric stirrer 41 are located in the reactor tank 42. The nitrogen distributor 45 is located below the stirring rod and close to the bottom of the reactor tank 42. A heater 43 and a thermal insulation layer 44 are installed on the outer wall of the reactor tank 42 from the inside to the outside. The heater 43 is an electric heater 43, which is used to heat the reactor tank 42, and the thermal insulation layer 44 plays a role of heat preservation.
[0023] exist Figure 3 In the present embodiment, the nitrogen distributor 45 is an annular tube with evenly distributed distribution holes. Nitrogen is continuously input into the reactor tank 42 through the nitrogen distributor 45. The nitrogen acts on the reaction raw materials, causing the reaction raw materials to continuously roll, promoting the reaction, and providing pressure for the reactor tank 42 at the same time.
[0024] The condensation mechanism of this embodiment is composed of a primary heat exchanger 8, a primary condenser 9, and a secondary condenser 10 connected in sequence. The condensation mechanism is used to gradually cool the light component to improve the recovery efficiency of the light component.
[0025] The working principle of the utility model is as follows:
[0026] The raw material tank 1 contains low-medium temperature coal tar hydrogenation tail oil as the raw material for preparing mesophase asphalt. The raw material in the raw material tank 1 is transported to the reactor tank 42 through the delivery pump 2, and the reactor tank 42 is heated by the heater 43. At the same time, nitrogen is input into the reactor tank 42 through the nitrogen distributor 45 and the electric stirrer 41 is stirred at a certain rate. The nitrogen is used as an atmosphere protection and provides pressure for the reactor tank 42. The raw material undergoes a thermal free radical reaction at a high temperature of 400-600°C, wherein the aromatic molecules undergo a series of complex thermal reactions such as dehydrogenation, cracking, aromatization, cyclization and polycondensation at a relatively high temperature to generate an mesophase asphalt product, and at the same time, light components are formed with the escape of small molecular substances. The mesophase asphalt product is output to the product tank 3 through the product output pipe at the bottom of the reactor tank 42. The light components are condensed by the condensation mechanism, and then pass through the alkali washing tank 11, and are finally discharged for recovery.
[0027] The wide-area mesophase asphalt prepared by the utility model has an mesophase content of 95-98%, a softening point of 80-190°C, and an ash content of 0.01-0.05%.
Claims
1. A device for preparing mesophase asphalt from medium- and low-temperature coal tar hydrogenation tail oil, characterized in that: A nitrogen delivery mechanism is connected to the air inlet pipe of the reactor group, the feed pipe of the reactor group is connected to the output pipe of the raw material tank through a delivery pump, the product output pipe of the reactor group is connected to the feed port of the product tank through a pipeline, the light component output pipe of the reactor group is connected to the input pipe of the condensation mechanism through a pipeline, and the exhaust pipe of the condensation mechanism is connected to the alkali washing tank through a pipeline.
2. The device for preparing mesophase asphalt from medium- and low-temperature coal tar hydrogenation tail oil according to claim 1, characterized in that: The reactor group consists of two reactors connected in parallel.
3. The device for preparing mesophase asphalt from medium- and low-temperature coal tar hydrogenation tail oil according to claim 2, characterized in that: The reactor is provided with an air inlet pipe, an electric stirrer and a feed pipe on the top of the reactor tank, and a product output pipe on the bottom. The lower end of the air inlet pipe is connected to a nitrogen distributor. The nitrogen distributor and the stirring rod of the electric stirrer are located in the reactor tank. A heater and a thermal insulation layer are sequentially arranged on the outer wall of the reactor tank from the inside to the outside.
4. The device for preparing mesophase asphalt from medium- and low-temperature coal tar hydrogenation tail oil according to claim 3, characterized in that: The nitrogen distributor is a ring-shaped tube provided with uniformly distributed distribution holes, and the nitrogen distributor is located below the stirring rod and close to the bottom of the reactor tank.
5. The device for preparing mesophase asphalt from medium- and low-temperature coal tar hydrogenation tail oil according to claim 3, characterized in that: The heater is an electric heater.
6. The device for preparing mesophase asphalt from low-temperature and medium-temperature coal tar hydrogenation tail oil according to claim 1, characterized in that: The condensing mechanism is composed of a primary heat exchanger, a primary condenser and a secondary condenser which are connected in sequence.
7. The device for preparing mesophase asphalt from low-temperature and medium-temperature coal tar hydrogenation tail oil according to claim 1, characterized in that: The nitrogen delivery mechanism comprises a nitrogen front buffer tank, a nitrogen compressor, a nitrogen rear buffer tank, and a nitrogen heater, and the nitrogen front buffer tank, the nitrogen compressor, the nitrogen rear buffer tank, and the nitrogen heater are sequentially connected through pipelines.