Product separation system for preparing benzene through toluene disproportionation

Abstract

The utility model relates to a chemical separation technology, and discloses a product separation system for benzene preparation through toluene disproportionation, which comprises a pre-separation tower, a light component tower, a toluene tower, a benzene tower and a controller, the pre-separation tower is connected with a feed preheater through a feed pipe, the feed preheater is connected with a feed delivery pipe, flow sensors are arranged on the feed pipe and the feed delivery pipe, and the controller is connected with the light component tower. The pre-separation tower is connected with a feed port of the light component tower, the light component tower is connected with feed ports of the toluene tower and the benzene tower, the pre-separation tower, the light component tower, the toluene tower and the benzene tower are all connected with a heat exchanger, the pre-separation tower, the light component tower, the toluene tower and the benzene tower are all connected with a condenser, the condenser is connected with a reflux tank, the reflux tank is connected with a reflux pump, and the reflux pump is connected with the heat exchanger. The reflux pump is respectively connected with the pre-separation tower, the light component tower, the toluene tower and the benzene tower, reboilers are arranged at the bottoms of the pre-separation tower, the light component tower, the toluene tower and the benzene tower, the reboilers are connected with the feeding preheater through heat circulating pipes, the reboilers are connected with liquid outlet pipes, and coolers are arranged on the liquid outlet pipes.

Description

Technical Field

[0001] This utility model relates to the field of chemical separation technology, and more specifically, to a product separation system for the production of benzene from toluene disproportionation. Background Technology

[0002] Toluene disproportionation is an important chemical process used to produce products such as benzene and p-xylene. In this reaction, toluene reacts in the presence of a catalyst to produce benzene, p-xylene, o-xylene, m-xylene, and some byproducts. Due to the complex composition of the reaction products and the similar boiling points of the components, separation is challenging. Traditional separation methods suffer from low efficiency and high energy consumption; therefore, a more efficient and energy-saving separation device is needed to meet production requirements. Utility Model Content

[0003] This application provides a product separation system for the production of benzene from toluene disproportionation, which solves the problems of low separation efficiency and high energy consumption in traditional separation methods.

[0004] This application provides a product separation system for the production of benzene from toluene disproportionation, comprising a pre-separation tower, a light component tower, a toluene tower, a benzene tower, and a controller. The pre-separation tower is connected to a feed preheater via a feed pipe. A feed preheater is connected to a conveying pipe. Flow sensors are installed on both the feed pipe and the conveying pipe. The pre-separation tower is connected to the inlet of the light component tower via a pipeline. The light component tower is connected to the inlets of the toluene tower and the benzene tower via pipelines. The pre-separation tower, the light component tower, the toluene tower, and the benzene tower are all connected to... The heat exchanger, the pre-separation tower, the light component tower, the toluene tower, and the benzene tower are all connected to a condenser via pipelines. The condenser is connected to a reflux tank, and the reflux tank is connected to a reflux pump. The reflux pump is connected to the pre-separation tower, the light component tower, the toluene tower, and the benzene tower via pipelines. The bottom of each of the pre-separation tower, the light component tower, the toluene tower, and the benzene tower is equipped with a reboiler. The reboiler is connected to the feed preheater via a heat circulation pipe. The reboiler is connected to an outlet pipe, and a cooler is installed on the outlet pipe.

[0005] Preferably, the heat exchanger is a plate heat exchanger or a shell-and-tube heat exchanger.

[0006] Preferably, temperature sensors are provided on the feed preheater, the pre-separation tower, the light component tower, the toluene tower, and the benzene tower.

[0007] Preferably, pressure sensors are provided on the pre-separation tower, the light component tower, the toluene tower, and the benzene tower.

[0008] Preferably, the controller is electrically connected to the temperature sensor, the pressure sensor, and the flow sensor.

[0009] Preferably, the pre-separation tower, the light component tower, the toluene tower, and the benzene tower are all connected to product tanks via pipelines.

[0010] As can be seen from the above technical solution, this application provides a product separation system for the production of benzene from toluene disproportionation. In operation, the toluene disproportionation reaction products first enter a feed preheater for preheating, and then enter a pre-separation tower. In the pre-separation tower, light components (such as benzene and toluene) rise to the top of the tower and enter the light component tower through the pre-separation tower inlet, while heavy components descend to the bottom of the tower and enter the product tank through the outlet. In the light component tower, benzene and toluene are further separated. Benzene enters the benzene tower through the light component tower inlet, and toluene enters the toluene tower through the toluene tower inlet. The benzene tower further purifies the benzene to obtain a high-purity benzene product, which is stored in the product tank. The toluene tower separates high-purity toluene, which is also stored in the product tank. Simultaneously, a heat exchanger recovers heat from each tower, reducing the energy consumption of the device. Various sensors are used to monitor the operating parameters of the device in real time and transmit the data to the controller. The controller automatically adjusts the device according to preset control logic.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model adopts a multi-tower separation system, which can effectively separate benzene, toluene and other components in the toluene disproportionation reaction products, thereby improving the purity and recovery rate of each product.

[0013] 2. This utility model recovers and utilizes heat by setting up a feed preheater and a heat exchanger, thereby reducing the energy consumption of the device and reducing environmental pollution.

[0014] 3. This utility model is equipped with a controller, which can monitor and control the operating parameters of the device in real time, ensuring the stability of production and the quality of products.

[0015] In summary, a product separation system for the production of benzene from toluene disproportionation employs a multi-tower separation system, which can effectively separate benzene, toluene, and other components from the toluene disproportionation reaction products, improve the purity and recovery rate of each product, and recover and utilize heat by setting up a feed preheater and heat exchanger, thereby reducing the energy consumption of the device and reducing environmental pollution. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of a product separation system for the production of benzene from toluene disproportionation, provided by this utility model.

[0018] The reference numerals in the detailed embodiments are as follows:

[0019] 1. Pre-separation tower; 2. Light component tower; 3. Toluene tower; 4. Benzene tower; 5. Flow sensor; 6. Feed preheater; 7. Heat exchanger; 8. Condenser; 9. Reboiler; 10. Reflux tank; 11. Reflux pump; 12. Product tank; 13. Temperature sensor; 14. Pressure sensor; 15. Controller; 16. Feed pipe; 17. Feed pipe; 18. Discharge pipe; 19. Heat circulation pipe; 20. Liquid outlet pipe; 21. Cooler. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0021] See Figure 1 This application discloses a product separation system for the production of benzene from toluene disproportionation. In order to solve the problems of low separation efficiency and high energy consumption in traditional separation methods, this application proposes a product separation system for the production of benzene from toluene disproportionation. The system adopts a multi-tower separation system, which can effectively separate benzene, toluene and other components in the toluene disproportionation reaction products, improve the purity and recovery rate of each product, and recover and utilize heat by setting up a feed preheater and heat exchanger, thereby reducing the energy consumption of the device and reducing environmental pollution.

[0022] Specifically, a product separation system for the production of benzene from toluene disproportionation includes a pre-separation tower 1, a light component tower 2, a toluene tower 3, a benzene tower 4, and a controller 15. The pre-separation tower 1 is connected to a feed preheater 6 via a feed pipe 17. The feed preheater 6 is used to preheat the reaction products entering the pre-separation tower 1, increasing the feed temperature to facilitate the subsequent separation process. A feed pipe 16 is connected to the feed preheater 6. Flow sensors 5 are installed on both the feed pipe 17 and the feed pipe 16. Temperature sensors 13 are installed on the feed preheater 6, pre-separation tower 1, light component tower 2, toluene tower 3, and benzene tower 4 to monitor the operating temperature inside the towers in real time. Pressure sensors 14 are installed on the pre-separation tower 1, light component tower 2, toluene tower 3, and benzene tower 4 to monitor the operating pressure inside the towers in real time. The controller 15 is electrically connected to the temperature sensor 13, pressure sensor 14, and flow sensor 5. The controller 15 is used to monitor and control the operating parameters of the entire device, such as temperature, pressure, and flow rate, to ensure stable operation of the device. Each sensor is used to monitor the operation of the device in real time. The parameters are processed and transmitted to controller 15. Controller 15 automatically adjusts the device according to preset control logic. Pre-separation tower 1 is connected to the feed inlet of light component tower 2 via a pipeline. The operating pressure of pre-separation tower 1 is 0.1-0.5 MPa, and the temperature inside the tower is 160-220℃. Pre-separation tower 1 performs preliminary separation of light components (such as benzene, toluene, etc.) from heavy components in the reaction products. The operating pressure of light component tower 2 is 0.05-0.2 MPa, and the temperature inside the tower is 80-160℃. At ℃, the light component tower 2 further separates the light components separated in the pre-separation tower 1 to obtain purer benzene and toluene. The light component tower 2 is connected to the feed inlets of the toluene tower 3 and the benzene tower 4 through pipelines. The operating pressure of the toluene tower 3 is 0.03-0.15MPa, and the temperature inside the tower is 110-180℃. The toluene tower 3 can separate high-purity toluene. The operating pressure of the benzene tower 4 is 0.02-0.1MPa, and the temperature inside the tower is 80-140℃. The benzene tower 4 further purifies benzene to obtain high-purity benzene product.

[0023] Pre-separation tower 1, light component tower 2, toluene tower 3, and benzene tower 4 are all connected to heat exchangers 7. Heat exchangers 7 are either plate heat exchangers or shell-and-tube heat exchangers. Heat exchangers 7 are used to recover heat from each tower, reducing the energy consumption of the unit. Pre-separation tower 1, light component tower 2, toluene tower 3, and benzene tower 4 are all connected to condensers 8 via pipelines. Condensers 8 are used to condense the gaseous components at the top of the towers. Condensers 8 are connected to reflux tanks 10, which are used to collect the condensed liquid. Reflux tanks 10 are connected to reflux pumps 11, which are connected to pre-separation tower 1, light component tower 2, toluene tower 3, and benzene tower 4 via pipelines. 1 is used to collect the condensed liquid and return part of the liquid to the corresponding tower through the reflux pump 11. The bottom of the pre-separation tower 1, light component tower 2, toluene tower 3 and benzene tower 4 are all equipped with reboilers 9. The reboilers 9 are used to provide heat to the bottom of the tower and promote the evaporation of the components. The reboilers 9 are connected to the feed preheater 6 through the heat circulation pipe 19. The reboilers 9 are connected to the liquid outlet pipe 20. The liquid outlet pipe 20 is equipped with a cooler 21 to cool the liquid and facilitate recovery. The pre-separation tower 1, light component tower 2, toluene tower 3 and benzene tower 4 are all connected to the product tank 12 through the pipeline. The product tank 12 is used to store the final toluene and benzene products.

[0024] As can be seen from the above technical solution, in the operation of a product separation system for toluene disproportionation to benzene, the toluene disproportionation reaction products first enter the feed preheater 6 for preheating, and then enter the pre-separation tower 1. In the pre-separation tower 1, the light components (such as benzene, toluene, etc.) rise to the top of the tower and enter the light component tower 2 through the feed inlet of the pre-separation tower 1, while the heavy components descend to the bottom of the tower and enter the product tank 12 through the discharge outlet. In the light component tower, benzene and toluene are further separated. Benzene enters the benzene tower 4 through the feed inlet of the light component tower 2, and toluene enters the toluene tower 3 through the feed inlet of the toluene tower 3. The benzene tower 4 further purifies the benzene to obtain a high-purity benzene product, which is stored in the product tank 12. The toluene tower 3 separates high-purity toluene, which is also stored in the product tank 12. At the same time, the heat exchanger 7 recovers the heat from each tower, reducing the energy consumption of the device. Various sensors are used to monitor the operating parameters of the device in real time and transmit the data to the controller 15. The controller 15 automatically adjusts the device according to the preset control logic.

[0025] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0026] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A product separation system for the production of benzene from toluene disproportionation, characterized in that: The system includes a pre-separation tower (1), a light component tower (2), a toluene tower (3), a benzene tower (4), and a controller (15). The pre-separation tower (1) is connected to a feed preheater (6) via a feed pipe (17). A conveying pipe (16) is connected to the feed preheater (6). Flow sensors (5) are installed on both the feed pipe (17) and the conveying pipe (16). The pre-separation tower (1) is connected to the inlet of the light component tower (2) via a pipe. The light component tower (2) is connected to the inlets of the toluene tower (3) and the benzene tower (4) via pipes. Heat exchangers (7) are connected to the pre-separation tower (1), the light component tower (2), the toluene tower (3), and the benzene tower (4). The separation tower (2), the toluene tower (3), and the benzene tower (4) are all connected to a condenser (8) via pipelines. The condenser (8) is connected to a reflux tank (10). The reflux tank (10) is connected to a reflux pump (11). The reflux pump (11) is connected to the pre-separation tower (1), the light component tower (2), the toluene tower (3), and the benzene tower (4) via pipelines. The bottom of the pre-separation tower (1), the light component tower (2), the toluene tower (3), and the benzene tower (4) are all equipped with reboilers (9). The reboilers (9) are connected to the feed preheater (6) via a heat circulation pipe (19). The reboilers (9) are connected to an outlet pipe (20). The outlet pipe (20) is equipped with a cooler (21).

2. The product separation system for the production of benzene from toluene disproportionation according to claim 1, characterized in that: The heat exchanger (7) is a plate heat exchanger or a shell-and-tube heat exchanger.

3. The product separation system for the production of benzene from toluene disproportionation according to claim 1, characterized in that: Temperature sensors (13) are provided on the feed preheater (6), the pre-separation tower (1), the light component tower (2), the toluene tower (3), and the benzene tower (4).

4. The product separation system for the production of benzene from toluene disproportionation according to claim 3, characterized in that: Pressure sensors (14) are provided on the pre-separation tower (1), the light component tower (2), the toluene tower (3) and the benzene tower (4).

5. The product separation system for the production of benzene from toluene disproportionation according to claim 4, characterized in that: The controller (15) is electrically connected to the temperature sensor (13), the pressure sensor (14), and the flow sensor (5).

6. The product separation system for the production of benzene from toluene disproportionation according to claim 1, characterized in that: The pre-separation tower (1), the light component tower (2), the toluene tower (3), and the benzene tower (4) are all connected to product tanks (12) via pipelines.

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