Benzene recovery unit

Abstract

The utility model relates to recovery device technical field, concretely is a kind of benzene recovery device, including waste oil buffer tank, waste oil buffer tank is connected with the top of crude benzene crystallization tank by pipeline, the bottom of crude benzene crystallization tank is connected with the top of fine benzene rectifying column by pipeline one, and cooling pipe is wound in side portion, and cooling pipe is connected with freezer;Pipeline one is provided with feed pump;The top of fine benzene rectifying column is connected with fine benzene condenser by pipeline, and bottom is connected with heavy residue discharge pipe;Fine benzene condenser is connected with fine benzene buffer tank by pipeline two;The utility model is through being provided with crude benzene crystallization tank and fine benzene rectifying column, first crystallization comes out crude benzene, and then distills crude benzene, and the fine benzene of distillation comes out, to realize the extraction and recovery of benzene, avoid the waste of resources, reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of recycling device technology, specifically a benzene recycling device. Background Technology

[0002] In the hydrogenation reaction of benzene, residual benzene will remain in the waste oil; in the extraction of caprolactam, benzene is used as the extractant, and residual benzene will also remain in the waste oil produced; previously, this waste oil was treated by combustion, which resulted in waste of resources and increased costs; there is no device in the existing technology for extracting and recovering benzene from waste oil. Utility Model Content

[0003] The main objective of this invention is to provide a benzene recovery device to solve the problem of how to extract and recover benzene from waste oil in the prior art.

[0004] To achieve the above objectives, this utility model provides a benzene recovery device, including a waste oil buffer tank. The waste oil buffer tank is connected to the top of a crude benzene crystallization tank via a pipe. The bottom of the crude benzene crystallization tank is connected to the top of a refined benzene distillation column via a first pipe. Cooling pipes are wound around the side of the column, and the cooling pipes are connected to a refrigeration unit. A feed pump is installed on the first pipe. The top of the refined benzene distillation column is connected to a refined benzene condenser via a pipe, and the bottom is connected to a heavy residue discharge pipe. The refined benzene condenser is connected to the refined benzene buffer tank via a second pipe.

[0005] Furthermore, a slurry circulation pipe is connected between the bottom and top of the crude benzene crystallization tank to draw the slurry from the bottom to the top, and a slurry circulation pump is installed on the slurry circulation pipe.

[0006] Furthermore, the bottom of the crude benzene crystallization tank is connected to a waste oil buffer tank via an impurity oil circulation pipe, and an impurity oil circulation pump is installed on the impurity oil circulation pipe.

[0007] Furthermore, a baffle is installed inside the benzene buffer tank, which is fixedly connected to the bottom of the benzene buffer tank and has a gap between it and the top of the benzene buffer tank for material passage; the bottom of the benzene buffer tank is connected to the benzene distillation column through pipe three; the connection points of pipe two and pipe three with the benzene buffer tank are located on the left side of the baffle; an external discharge pipe one is installed on the right side of the baffle.

[0008] Furthermore, the waste oil buffer tank is connected to an oil inlet pipe and an external discharge pipe 2; the external discharge pipe 2 is equipped with a detector for detecting benzene concentration.

[0009] Furthermore, a reboiler is installed at the bottom of the benzene distillation column, and the reboiler is connected to a steam pipe.

[0010] Furthermore, a spray head is installed at the top of the crude benzene crystallization tank, and the waste oil buffer tank is connected to the spray head via a pipe.

[0011] This invention achieves the extraction and recovery of benzene by setting up a crude benzene crystallization tank and a refined benzene distillation tower, first crystallizing crude benzene, and then distilling the crude benzene to obtain refined benzene, thereby avoiding resource waste and reducing costs. Attached Figure Description

[0012] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0013] Figure 1 This is a schematic diagram of an embodiment of a benzene recovery device;

[0014] In the diagram: 1. Waste oil buffer tank; 2. Crude benzene crystallization tank; 201. Spray head; 3. Refined benzene distillation column; 301. Reboiler; 4. Refined benzene condenser; 5. Cooling pipe; 6. Refrigeration unit; 7. Heavy residue discharge pipe; 8. Refined benzene buffer tank; 801. Baffle plate; 9. Slurry circulation pipe; 10. Slurry circulation pump; 11. Pipeline 1; 12. Pipeline 2; 13. Pipeline 3; 14. External discharge pipe 1; 15. Oil inlet pipe; 16. External discharge pipe 2; 17. Steam pipe; 18. Detector; 19. Impurity oil circulation pipe. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] like Figure 1 As shown, according to an embodiment of the present invention, a benzene recovery device is provided, including a waste oil buffer tank 1. The waste oil buffer tank 1 is connected to the top of a crude benzene crystallization tank 2 via a pipe. The bottom of the crude benzene crystallization tank 2 is connected to the top of a refined benzene distillation column 3 via a pipe 11. A cooling pipe 5 is wound around the side of the column, and the cooling pipe 5 is connected to a refrigeration unit 6. A feed pump is installed on the pipe 11. The top of the refined benzene distillation column 3 is connected to a refined benzene condenser 4 via a pipe, and the bottom is connected to a heavy residue discharge pipe 7. The refined benzene condenser 4 is connected to a refined benzene buffer tank 8 via a pipe 2 12.

[0017] The bottom and top of the crude benzene crystallization tank 2 are connected by a slurry circulation pipe 9, which draws the slurry from the bottom to the top. A slurry circulation pump 10 is installed on the slurry circulation pipe 9. The slurry circulation pipe 9 circulates the material in the vertical direction, which is beneficial to the crystallization of crude benzene.

[0018] The bottom of the crude benzene crystallization tank 2 is also connected to the waste oil buffer tank 1 through the impurity oil circulation pipe 19. The impurity oil circulation pipe 19 is equipped with an impurity oil circulation pump. The waste oil buffer tank 1 is connected to the oil inlet pipe 15 and the external discharge pipe 16.

[0019] The impurity oil circulation pipe 19 can circulate the impurity oil multiple times, ensuring that the vast majority of benzene in the impurity oil is recovered; the detection instrument 18 can ensure that the discharged impurity oil contains only a very small amount of benzene.

[0020] A baffle plate 801 is installed inside the benzene buffer tank 8. The baffle plate 801 is fixedly connected to the bottom of the benzene buffer tank 8 and a gap for material passage is provided between it and the top of the benzene buffer tank 8. The bottom of the benzene buffer tank 8 is connected to the benzene distillation column 3 through pipe 3 13. The connection points of pipe 2 12 and pipe 3 13 with the benzene buffer tank 8 are located on the left side of the baffle plate 801. An external discharge pipe 14 is provided on the right side of the baffle plate 801.

[0021] A reboiler 301 is installed at the bottom of the benzene distillation column 3, and the reboiler 301 is connected to a steam pipe 17.

[0022] A spray head 201 is installed at the top of the crude benzene crystallization tank 2, and the waste oil buffer tank 1 is connected to the spray head 201 through a pipe.

[0023] In some embodiments, the discharge pipe 2 16 is equipped with a detector 18 for detecting benzene concentration.

[0024] This invention achieves the extraction and recovery of benzene by setting up a crude benzene crystallization tank and a refined benzene distillation tower, first crystallizing crude benzene, and then distilling the crude benzene to obtain refined benzene, thereby avoiding resource waste and reducing costs.

[0025] The steps of the benzene recovery unit are:

[0026] First, the waste oil in the waste oil buffer tank 1 is introduced into the crude benzene crystallization tank 2. Benzene and a small amount of impurities crystallize in the crude benzene crystallization tank 2 to form crude benzene. The crude benzene is separated from other waste oil, with the crude benzene located in the lower layer and the other waste oil located in the upper layer.

[0027] Then, crude benzene is fed into the benzene distillation column 3, where benzene is separated from impurities through distillation. After distillation, the benzene mixed with a very small amount of impurities enters the benzene condenser 4 for condensation, and then enters the benzene buffer tank 8. In the benzene buffer tank 8, the benzene and impurities are separated, with the benzene in the upper layer and the impurities in the lower layer. The benzene overflows from the left side of the partition 801 to the right side of the partition 801, thus achieving the separation of benzene and impurities. After separation, the benzene is discharged through the external discharge pipe 14, while the impurities enter the benzene distillation column 3 through the pipe 13.

[0028] Finally, the heavy residue at the bottom of the benzene distillation column 3 is discharged through the heavy residue discharge pipe 7.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A benzene recovery device, characterized in that, The system includes a waste oil buffer tank (1), which is connected to the top of a crude benzene crystallization tank (2) via a pipe. The bottom of the crude benzene crystallization tank (2) is connected to the top of a refined benzene distillation tower (3) via a pipe (11). A cooling pipe (5) is wound around the side of the tower, and the cooling pipe (5) is connected to a refrigeration unit (6). A feed pump is installed on the pipe (11). The top of the refined benzene distillation tower (3) is connected to a refined benzene condenser (4) via a pipe, and the bottom is connected to a heavy residue discharge pipe (7). The refined benzene condenser (4) is connected to a refined benzene buffer tank (8) via a pipe (12).

2. The benzene recovery apparatus according to Claim 1, wherein The bottom and top of the crude benzene crystallization tank (2) are connected by a slurry circulation pipe (9) for drawing slurry from the bottom to the top, and a slurry circulation pump (10) is provided on the slurry circulation pipe (9).

3. The benzene recovery apparatus according to Claim 1, wherein The bottom of the crude benzene crystallization tank (2) is also connected to the waste oil buffer tank (1) through the impurity oil circulation pipe (19), and the impurity oil circulation pipe (19) is equipped with an impurity oil circulation pump.

4. The benzene recovery apparatus according to Claim 1, wherein The benzene buffer tank (8) is equipped with a partition (801), which is fixedly connected to the bottom of the benzene buffer tank (8) and has a gap between it and the top of the benzene buffer tank (8) for material passage; the bottom of the benzene buffer tank (8) is connected to the benzene distillation column (3) through pipe three (13); the connection points of pipe two (12) and pipe three (13) with the benzene buffer tank (8) are located on the left side of the partition (801); an external discharge pipe one (14) is provided on the right side of the partition (801).

5. The benzene recovery apparatus of claim 1 wherein, The waste oil buffer tank (1) is connected to an oil inlet pipe (15) and an external discharge pipe (16); the external discharge pipe (16) is equipped with a detector (18) for detecting benzene concentration.

6. The benzene recovery apparatus of claim 1 wherein, The bottom of the benzene distillation column (3) is provided with a reboiler (301), and the reboiler (301) is connected to a steam pipe (17).

7. The benzene recovery apparatus of claim 1 wherein, The top of the crude benzene crystallization tank (2) is equipped with a spray head (201), and the waste oil buffer tank (1) is connected to the spray head (201) through a pipe.

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