Crude fatty nitrile rectification device

Abstract

The utility model relates to the technical field of fatty nitrile rectification, in particular to a crude fatty nitrile rectification device. The crude fatty nitrile rectification device comprises a first-stage rectification tower and a second-stage rectification tower, the first-stage rectification tower is connected with the second-stage rectification tower through a filter, a first-stage condenser is arranged in the first-stage rectification tower, an annular scraper is arranged above the first-stage condenser, a porous absorption ejector is arranged above the annular scraper, a filter plate is arranged in the filter, and a second-stage condenser is arranged in the second-stage rectification tower. And a scraping plate is arranged below the filter plate. According to the device, the first-stage rectifying tower, the second-stage rectifying tower and the filter are matched for use, when the efficiency of the first-stage rectifying tower is reduced, a mixed phase in the first-stage rectifying tower is filtered by the filter and then enters the second-stage rectifying tower, and meanwhile, the annular scraping plate and the porous absorption ejector are started to scrape and clean the first-stage rectifying tower, so that the rectifying efficiency is greatly improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fatty nitrile rectification, in particular to a rectification device for crude fatty nitrile. Background Art

[0002] Fatty nitrile is a kind of important organic compound, which is widely used in the fields of synthetic plastics, rubber, fibers, coatings, medicine, etc. Crude fatty nitrile usually contains impurities, such as the reacted catalyst, moisture, insoluble solids, other organic solvents, etc. These impurities will affect the quality and application performance of fatty nitrile. In the rectification process, the mixture is heated to its boiling point, and the pure fatty nitrile is collected at the top of the tower, while the impurities are discharged at the bottom of the tower.

[0003] In actual production, the crude fatty nitrile contains a catalyst. During the rectification process, the phenomenon of catalyst wall hanging is likely to occur, which seriously affects the normal rectification and greatly increases its energy consumption; and when using a single rectification tower for rectification, this phenomenon is more serious. Content of the Utility Model

[0004] According to the above deficiencies in the prior art, the purpose of the utility model is to provide a rectification device for crude fatty nitrile. Through the combined use of a primary rectification tower, a secondary rectification tower and a filter, when the efficiency of the primary rectification tower decreases, the internal mixed phase is filtered by the filter and then enters the secondary rectification tower. At the same time, the annular scraper and the porous absorption ejector are started to scrape and clean the primary rectification tower, greatly improving the rectification efficiency and saving energy consumption.

[0005] The utility model is realized by adopting the following technical scheme:

[0006] The rectification device for crude fatty nitrile includes a primary rectification tower and a secondary rectification tower. The primary rectification tower is connected to the secondary rectification tower through a filter. An primary condenser is arranged inside the primary rectification tower. An annular scraper is arranged above the primary condenser. A porous absorption ejector is arranged above the annular scraper. A filter plate is arranged inside the filter, and a scraper is arranged below the filter plate.

[0007] The scraper rotates to remove the impurities attached to the filter plate. A discharge port is arranged at the bottom of the rectification tower.

[0008] When the primary rectification tower is working normally, the porous absorption ejector serves as the air inlet of the connecting pipeline. When cleaning the primary rectification tower, the flushing liquid can be ejected reversely (the power for ejection comes from the flushing pump). At the same time, the flushing liquid pumped by the flushing pump can also flush the connecting pipeline to avoid blockage of the connecting pipeline.

[0009] The annular scraper is connected to the telescopic cylinder through a telescopic rod, and the porous absorption ejector is connected to the vacuum pump through a connecting pipeline.

[0010] The first-stage distillation tower is connected to a first-stage collecting tank through a pipeline, and a first-stage reboiler is arranged below the first-stage distillation tower.

[0011] The filter has a filter outlet on its vertical wall, the filter outlet is located above the filter plate, the filter outlet is connected to the secondary distillation tower, and a drive motor is connected to the scraper.

[0012] The crude fatty nitrile distillation device also includes a flushing pump, which is connected to a connecting pipeline, and the first-stage distillation tower is connected to a pipeline for a further-stage distillation tower.

[0013] The connection between the flushing pump and the connecting pipe is located between the connection between the primary distillation tower, the secondary distillation tower and the connecting pipe. Valves are arranged on the connecting pipe, one of which is located on the connecting pipe between the flushing pump and the secondary distillation tower.

[0014] A filter inlet pipeline is arranged between the primary distillation tower and the filter, and the connection between the filter inlet pipeline and the filter is located below the filter plate.

[0015] The secondary distillation tower is provided with a secondary condenser inside, the secondary distillation tower is connected with a secondary collecting tank, the secondary distillation tower is provided with a secondary reboiler, and the secondary distillation tower is connected with a connecting pipeline through a pipeline.

[0016] The working principle of the utility model is:

[0017] The crude fatty nitrile enters the first-stage distillation tower through the first-stage distillation tower pipeline, the first-stage reboiler and the first-stage condenser start working, the vacuum pump starts, and the crude fatty nitrile is distilled in the first-stage distillation tower; when the efficiency of the first-stage distillation tower decreases, the crude fatty nitrile is pumped into the filter, the drive motor drives the scraper to start rotating, and after filtration, it enters the second-stage distillation tower, the second-stage reboiler and the second-stage condenser start working; turn on the flushing pump, pump the flushing water into the first-stage distillation tower, and scrape the attachments on the wall through the annular scraper. The scraper removes impurities attached to the filter plate by rotating. There is a discharge port at the bottom of the distillation tower.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The crude fatty nitrile distillation device of the utility model is adopted, through the coordinated use of a primary distillation tower, a secondary distillation tower and a filter, when the efficiency of the primary distillation tower is reduced, the mixed phase in the primary distillation tower is filtered through the filter and then enters the secondary distillation tower, and at the same time, the annular scraper and the porous absorption ejector are opened to scrape and clean the primary distillation tower, thereby greatly improving the distillation efficiency and saving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the crude fatty nitrile distillation device of the utility model;

[0021] In the figure: 1. Primary rectification column; 2. Secondary rectification column; 3. Filter; 4. Primary condenser; 5. Secondary condenser; 6. Primary reboiler; 7. Secondary reboiler; 8. Primary collection tank; 9. Secondary collection tank; 10. Annular scraper; 11. Telescopic cylinder; 12. Telescopic rod; 13. Porous absorption ejector; 14. Filter plate; 15. Scraper; 16. Driving motor; 17. Connecting pipe; 18. Vacuum pump; 19. Flushing pump; 20. Pipe for entering the primary rectification column; 21. Pipe for entering the filter; 22. Outlet of the filter. Specific embodiments

[0022] In order to make the purpose and technical solutions of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] Embodiment 1

[0024] As Figure 1 shown, the crude fatty nitrile rectification device includes a primary rectification column 1 and a secondary rectification column 2. The primary rectification column 1 is connected to the secondary rectification column 2 through a filter 3. Inside the primary rectification column 1, there is a primary condenser 4. Above the primary condenser 4, there is an annular scraper 10. Above the annular scraper 10, there is a porous absorption ejector 13. Inside the filter 3, there is a filter plate 14. Below the filter plate 14, there is a scraper 15. The scraper 15 rotates to remove impurities adhering to the filter plate 14. There is an outlet at the bottom of the rectification column. The annular scraper 10 is connected to the telescopic cylinder 11 through the telescopic rod 12. The porous absorption ejector 13 is connected to the vacuum pump 18 through the connecting pipe 17. The primary rectification column 1 is connected to a primary collection tank 8 through a pipe. Below the primary rectification column 1, there is a primary reboiler 6. On the vertical wall of the filter 3, there is an outlet 22 of the filter. The outlet 22 of the filter is located above the filter plate 14. The outlet 22 of the filter is connected to the secondary rectification column 2. The scraper 15 is connected to a driving motor 16. It also includes a flushing pump 19. The flushing pump 19 is connected to the connecting pipe 17. The primary rectification column 1 is connected to a pipe 20 for entering the primary rectification column. Between the primary rectification column 1 and the filter 3, there is a pipe 21 for entering the filter. The connection part of the pipe 21 for entering the filter and the filter 3 is located below the filter plate 14. Inside the secondary rectification column 2, there is a secondary condenser 5. The secondary rectification column 2 is connected to a secondary collection tank 9. On the secondary rectification column 2, there is a secondary reboiler 7. The secondary rectification column 2 is connected to the connecting pipe 17 through a pipe.

[0025] When the above-mentioned crude fatty nitrile rectification device works, it includes the following steps:

[0026] (1) The crude fatty nitrile enters the first rectification column 1 through the pipeline 20 of the first rectification column. The first reboiler 6 and the first condenser 4 start to work, and the vacuum pump 18 is started. The crude fatty nitrile is rectified in the first rectification column 1. (2) When the efficiency of the first rectification column 1 decreases, the crude fatty nitrile in it is pumped into the filter 3. The driving motor 16 drives the scraper 15 to start rotating. After filtration, it enters the second rectification column 2. The second reboiler 7 and the second condenser 5 start to work. (3) The flushing pump 19 is turned on, and the flushing water is pumped into the first rectification column 1. The attachment on the opposite wall is scraped off by the annular scraper 10.

Claims

1. A crude fatty nitrile distillation device, characterized in that: The invention comprises a primary distillation tower (1) and a secondary distillation tower (2), wherein the primary distillation tower (1) is connected to the secondary distillation tower (2) via a filter (3), a primary condenser (4) is arranged inside the primary distillation tower (1), an annular scraper (10) is arranged above the primary condenser (4), a porous absorption ejector (13) is arranged above the annular scraper (10), a filter plate (14) is arranged inside the filter (3), and a scraper (15) is arranged below the filter plate (14).

2. The crude fatty nitrile distillation device according to claim 1, characterized in that: The annular scraper (10) is connected to the telescopic cylinder (11) via a telescopic rod (12), and the porous absorption ejector (13) is connected to the vacuum pump (18) via a connecting pipe (17).

3. The crude fatty nitrile distillation device according to claim 1, characterized in that: The primary distillation tower (1) is connected to a primary collecting tank (8) via a pipeline, and a primary reboiler (6) is provided below the primary distillation tower (1).

4. The crude fatty nitrile distillation device according to claim 1, characterized in that: A filter outlet (22) is provided on the vertical wall of the filter (3), the filter outlet (22) is located above the filter plate (14), the filter outlet (22) is connected to the secondary distillation tower (2), and a drive motor (16) is connected to the scraper (15).

5. The crude fatty nitrile distillation device according to claim 2, characterized in that: It also includes a flushing pump (19), which is connected to the connecting pipeline (17). The first-stage distillation tower (1) is connected to a pipeline (20) for a further-stage distillation tower.

6. The crude fatty nitrile distillation device according to claim 1, characterized in that: A filter inlet pipe (21) is provided between the primary distillation tower (1) and the filter (3), and the connection between the filter inlet pipe (21) and the filter (3) is located below the filter plate (14).

7. The crude fatty nitrile distillation device according to claim 2, characterized in that: The secondary distillation tower (2) is provided with a secondary condenser (5) inside, the secondary distillation tower (2) is connected to a secondary collecting tank (9), the secondary distillation tower (2) is provided with a secondary reboiler (7), and the secondary distillation tower (2) is connected to a connecting pipeline (17) through a pipeline.

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