Rectification system for preparing bromo-pyrrole nitrile

Abstract

The rectification system comprises a tower body and a heat exchange kettle body, the tower body is fixedly connected to the top of the heat exchange kettle body, and inner cavities of the tower body and the heat exchange kettle body are communicated; a gas phase outlet is formed in the top of the tower body, the gas phase outlet is connected with a gas phase inlet of the condenser through a pipeline, and a condensation outlet of the condenser is connected with a DMF front fraction tank and a DMF rear fraction tank through pipelines; a heat preservation jacket is arranged outside the heat exchange kettle body, a vacuum cavity is formed between the heat preservation jacket and the heat exchange kettle body, a spiral heat exchange pipe is installed in the heat exchange kettle body, a conical shell is arranged at the kettle bottom of the heat exchange kettle body, a main shaft arranged in the vertical direction is installed in the conical shell, and two sets of paddles are installed on the main shaft. According to the rectification system provided by the utility model, materials to be rectified can be quickly and uniformly heated, the rectification efficiency is improved, and the heat loss can be reduced.

Description

Technical Field

[0001] The utility model relates to a rectification system, specifically to a rectification system for the preparation of bromopyronil, belonging to the technical field of rectification equipment. Background Art

[0002] Bromopyronil, also known as trolipyril, is a white crystalline solid at normal temperature and pressure. It is soluble in water but insoluble in most organic solvents and has weak alkalinity. The crude bromopyronil needs to be centrifuged. The centrifuged waste liquid contains DMF. If the waste liquid is directly discarded, it will cause great waste of resources and environmental pollution. The conventional recovery process is to purify and recover such waste liquid by rectification, thereby effectively recovering the DMF contained therein and achieving the purpose of resource recovery and treatment of pollutants up to standard discharge.

[0003] The waste liquid containing DMF needs to be purified and recycled through a rectification column. Currently, the rectification column for DMF recovery generally uses an external jacket to heat the bottom material of the column. There is a problem of uneven internal and external heating of the bottom material of the column, the heating effect is uneven, and the overall material is heated slowly, reducing the rectification efficiency.

[0004] In summary, it is obvious that the existing technology has inconveniences and defects in actual use, so it is necessary to be improved. Content of the Utility Model

[0005] Aiming at the deficiencies in the background art, the utility model provides a rectification system for the preparation of bromopyronil, which can make the material to be rectified heat quickly and evenly, improve the rectification efficiency, and reduce the heat loss.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The rectification system for the preparation of bromopyronil includes a tower body and a heat exchange kettle body. The tower body is fixedly connected to the top of the heat exchange kettle body, and the inner cavities of the two are connected; a gas phase outlet is provided at the top of the tower body, and the gas phase outlet is connected to the gas phase inlet of the condenser through a pipeline. The condensation outlet of the condenser is connected with a DMF pre-fraction tank and a DMF post-fraction tank through pipelines;

[0008] A heat preservation jacket is provided outside the heat exchange kettle body, and a vacuum cavity is provided between the heat preservation jacket and the heat exchange kettle body; a spiral heat exchange tube is installed inside the heat exchange kettle body. A conical shell is provided at the bottom of the heat exchange kettle body. A main shaft arranged vertically is installed inside the conical shell. Two groups of paddle blades are installed on the main shaft. The two groups of paddle blades include a first paddle blade above and a second paddle blade below. The first paddle blade is located inside the spiral heat exchange tube, and the second paddle blade is located below the spiral heat exchange tube. The second paddle blade is of an arc-shaped structure.

[0009] Further, a filler is provided inside the tower body, and a feed inlet is provided on the side of the tower body.

[0010] Furthermore, the bottom of the DMF pre-fraction tank is connected to a mixing pipe, and the mixing pipe is also connected to the bottom of the material tank. The outlet end of the mixing pipe is connected to the feed inlet.

[0011] Furthermore, the bottom of the DMF post-fraction tank is connected to the product storage tank through a pipeline.

[0012] Furthermore, a steam inlet is provided at the top end of the spiral heat exchange pipe, and a condensate outlet is provided at the bottom end of the spiral heat exchange pipe. The steam inlet and the condensate outlet penetrate through the side walls of the heat exchange kettle body and the insulation jacket.

[0013] Furthermore, the heat exchange kettle body is fixedly connected above the support chassis.

[0014] Furthermore, a rotating seal is provided at the connection between the main shaft and the conical shell. The lower end of the main shaft passes through a rotating support cylinder, and the rotating support cylinder is fixedly connected within the support chassis.

[0015] Furthermore, the bottom end of the main shaft is connected to a driving device within the support chassis.

[0016] Furthermore, a residual liquid discharge pipe is provided at the bottom of the heat exchange kettle body.

[0017] After the present utility model adopts the above technical solutions, compared with the prior art, it has the following advantages:

[0018] A spiral heat exchange component and a stirring component are arranged inside the heat exchange kettle body. The stirring paddle is designed with a special structure to ensure the stirring efficiency. The spiral heat exchange component and the stirring component cooperate to enable the material to be rectified to be heated quickly and evenly, improving the rectification efficiency; by providing an insulation jacket outside the heat exchange kettle body, a vacuum cavity is formed inside the insulation jacket to reduce the heat dissipation from the heat exchange kettle body to the outside and improve the utilization rate of heat.

[0019] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0020] Figure 1 is a structural schematic diagram of the present utility model;

[0021] Figure 2 is an enlarged view of the bottom structure of the present utility model.

[0022] In the figure, 1 is the tower body, 2 is the heat exchange kettle body, 3 is the heat preservation jacket, 4 is the supporting chassis, 5 is the spiral heat exchange tube, 6 is the steam inlet, 7 is the condensate outlet, 8 is the conical shell, 9 is the main shaft, 10 is the first paddle, 11 is the second paddle, 12 is the rotating support cylinder, 13 is the driving device, 14 is the packing, 15 is the feed inlet, 16 is the gas phase outlet, 17 is the condenser, 18 is the DMF pre-fraction tank, 19 is the DMF post-fraction tank, 20 is the material tank, 21 is the mixing pipe, 22 is the product storage tank, 23 is the residue discharge pipe. Detailed implementation manners

[0023] For a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation manners of the present utility model will now be described with reference to the accompanying drawings.

[0024] As Figure 1 and Figure 2 collectively shown, the present utility model provides a rectification system for the preparation of bromopyronil, which includes a tower body 1 and a heat exchange kettle body 2. The tower body 1 is fixedly connected to the top of the heat exchange kettle body 2, and the inner cavities of the two are connected.

[0025] The tower body 1 is internally provided with packing 14, the side of the tower body 1 is provided with a feed inlet 15, and the top of the tower body 1 is provided with a gas phase outlet 16.

[0026] The gas phase outlet 16 is connected to the gas phase inlet of the condenser 17 through a pipeline, and the condensation outlet of the condenser 17 is connected to a DMF pre-fraction tank 18 and a DMF post-fraction tank 19 through a pipeline.

[0027] The bottom of the DMF pre-fraction tank 18 is connected to the mixing pipe 21. The mixing pipe 21 is also connected to the bottom of the material tank 20. The outlet end of the mixing pipe 21 is connected to the feed inlet 15. The pre-fraction product and the material in the material tank 20 are mixed and then enter the tower body 1.

[0028] The bottom of the DMF post-fraction tank 19 is connected to the product storage tank 22 through a pipeline.

[0029] The outside of the heat exchange kettle body 2 is provided with a heat preservation jacket 3. A vacuum chamber is provided between the heat preservation jacket 3 and the heat exchange kettle body 2 to reduce the heat dissipation from the heat exchange kettle body 2 to the outside.

[0030] The heat exchange kettle body 2 is fixedly connected above the supporting chassis 4. A spiral heat exchange tube 5 is installed inside the heat exchange kettle body 2. The top of the spiral heat exchange tube 5 is provided with a steam inlet 6, and the bottom of the spiral heat exchange tube 5 is provided with a condensate outlet 7. The steam inlet 6 and the condensate outlet 7 penetrate through the side walls of the heat exchange kettle body 2 and the heat preservation jacket 3.

[0031] A conical shell 8 is provided at the bottom of the heat exchange kettle body 2. A main shaft 9 arranged vertically is installed inside the conical shell 8. A rotating seal is provided at the connection between the main shaft 9 and the conical shell 8. The lower end of the main shaft 9 passes through a rotating support cylinder 12, and the rotating support cylinder 12 is fixedly connected to the support chassis 4.

[0032] The bottom end of the main shaft 9 is connected to a driving device 13 inside the support chassis 4.

[0033] Two groups of paddle blades are installed on the main shaft 9. The two groups of paddle blades include a first paddle blade 10 above and a second paddle blade 11 below. The first paddle blade 10 is located inside the spiral heat exchange tube 5, and the second paddle blade 11 is located below the spiral heat exchange tube 5. The second paddle blade 11 is of an arc structure to adapt to the shape of the bottom of the heat exchange kettle body 2, ensure the stirring efficiency, and make the material to be rectified evenly heated.

[0034] A residual liquid discharge pipe 23 is provided at the bottom of the heat exchange kettle body 2.

[0035] The specific working principle of the present utility model:

[0036] The heat exchange kettle body 2 is internally provided with a spiral heat exchange component and a stirring component. The spiral heat exchange component and the stirring component cooperate to enable the material to be rectified to be quickly and evenly heated, improving the rectification efficiency. By providing a heat preservation jacket 3 outside the heat exchange kettle body 2, a vacuum chamber is formed inside the heat preservation jacket 3 to reduce the heat dissipation from the heat exchange kettle body 2 to the outside.

[0037] The material is heated in the heat exchange kettle body 2 and rectified in the tower body 1. The rectified gas phase enters the condenser 17 for condensation. The fore fraction is sent to the DMF fore fraction tank 18 and then enters the tower body 1 after being mixed with the material in the material tank 20 by a pump. The after fraction is sent to the DMF after fraction tank 19 and then enters the product storage tank 22; the residual liquid at the bottom after rectification is discharged from the residual liquid discharge pipe 23.

[0038] The above is an example of the best implementation mode of the present utility model. The parts not described in detail are all common general knowledge of those skilled in the art. The protection scope of the present utility model is subject to the content of the claims. Any equivalent transformation based on the technical inspiration of the present utility model is also within the protection scope of the present utility model.

Claims

1. A rectification system for the preparation of bromopyruvonitrile, characterized in that: It includes a tower body (1) and a heat exchange kettle body (2). The tower body (1) is fixedly connected to the top of the heat exchange kettle body (2), and the inner cavities of the two are connected; a gas phase outlet (16) is provided at the top of the tower body (1), and the gas phase outlet (16) is connected to the gas phase inlet of a condenser (17) through a pipeline. The condensation outlet of the condenser (17) is connected with a DMF pre-fraction tank (18) and a DMF post-fraction tank (19) through pipelines. A heat preservation jacket (3) is provided outside the heat exchange kettle body (2). A vacuum cavity is provided between the heat preservation jacket (3) and the heat exchange kettle body (2). A spiral heat exchange tube (5) is installed inside the heat exchange kettle body (2). A conical shell (8) is provided at the bottom of the heat exchange kettle body (2). A main shaft (9) arranged vertically is installed inside the conical shell (8). Two groups of paddle blades are installed on the main shaft (9). The two groups of paddle blades include a first paddle blade (10) above and a second paddle blade (11) below. The first paddle blade (10) is located inside the spiral heat exchange tube (5), and the second paddle blade (11) is located below the spiral heat exchange tube (5). The second paddle blade (11) is of an arc-shaped structure.

2. The rectification system for preparing bromopyronitrile according to claim 1, wherein: Packing (14) is provided inside the tower body (1), and a feed inlet (15) is provided on the side of the tower body (1).

3. The rectification system for preparing bromopyronitrile according to claim 2, wherein: The bottom of the DMF pre-fraction tank (18) is connected to a mixing pipe (21). The mixing pipe (21) is also connected to the bottom of a material tank (20). The outlet end of the mixing pipe (21) is connected to the feed inlet (15).

4. The rectification system for preparing bromo-pyrrole nitrile according to claim 1, characterized in that: The bottom of the DMF post-fraction tank (19) is connected to a product storage tank (22) through a pipeline.

5. The rectification system for preparing bromopyruvonitrile according to claim 1, characterized in that: A steam inlet (6) is provided at the top of the spiral heat exchange tube (5), and a condensate outlet (7) is provided at the bottom of the spiral heat exchange tube (5). The steam inlet (6) and the condensate outlet (7) penetrate through the side walls of the heat exchange kettle body (2) and the heat preservation jacket (3).

6. The rectification system for preparing bromonitrilopyrrole as described in claim 1, characterized in that: The heat exchange kettle body (2) is fixedly connected above a support chassis (4).

7. The rectification system for preparing bromopyronitrile according to claim 6, wherein: A rotating seal is provided at the connection between the main shaft (9) and the conical shell (8). The lower end of the main shaft (9) is arranged inside a rotating support cylinder (12), and the rotating support cylinder (12) is fixedly connected inside the support chassis (4).

8. The rectification system for preparing bromopyruvonitrile according to claim 7, wherein: The bottom end of the main shaft (9) is connected to a driving device (13) inside the support chassis (4).

9. The rectification system for preparing bromopyruvonitrile according to claim 1, wherein: A residue discharge pipe (23) is provided at the bottom of the heat exchange kettle body (2).

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