Crude benzene rectification separation device for cyclohexane dehydrogenation product

Abstract

The utility model provides a cyclohexane dehydrogenation product crude benzene rectification separation device which comprises a bottom plate, a rectification tower is fixed on the bottom plate through a plurality of supporting legs, the bottom of the rectification tower is communicated with a liquid outlet pipe, the top of the rectification tower is communicated with a steam guide pipe, one side of the rectification tower is communicated with a liquid inlet pipe, and the liquid inlet pipe is communicated with a steam outlet pipe. A supporting ring seat is fixed in the rectifying tower, a separation cover is fixed on the supporting ring seat, the top of the separation cover is communicated with an air outlet pipe, a mounting frame is fixed at the bottom of the supporting ring seat, a rotating shaft is movably arranged on the mounting frame through a bearing, and a plurality of exhaust blades are fixed at the top of the rotating shaft in the circumferential direction; the utility model solves the problems that when the existing fractionating tower is used, the fractionating efficiency is influenced on one hand, the pressure in the tower is easily increased on the other hand, and the fractionating tower is not convenient to use because steam cannot be quickly discharged in the fractionating tower.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a device for distilling and separating crude benzene produced by dehydrogenation of cyclohexane. Background Art

[0002] The crude benzene product contains a certain amount of biphenyl and other heavy components (about 0.2%wt) in the current production process of cyclohexane dehydrogenation. In order to avoid its entry into the cyclohexanone benzene hydrogenation unit to reduce the catalyst activity and affect the production of the cyclohexanone device. It is necessary to lead all the crude benzene products to the cyclohexanone refining unit, and separate the heavy components such as biphenyl by extractive distillation, which can effectively avoid the heavy components such as biphenyl from being brought into the benzene hydrogenation unit. Before the crude benzene is passed into the cyclohexanone refining unit, it is necessary to split the crude benzene into two paths, one containing biphenyl continues to enter the cyclohexanone refining unit, and the other does not contain biphenyl and enters the benzene tank, and is mixed with purchased refined benzene for use by cyclohexanone. In this way, the processing capacity of the crude benzene cyclohexanone removal unit (more than 50%) can be greatly reduced, and the load reduction is conducive to the effect of refining and separation. When the crude benzene is processed, it can be split according to the principle of utilizing the large difference in boiling points of light and heavy components, and a fractionation treatment method can be adopted during the splitting.

[0003] Publication No. CN214142199U discloses a fractionation tower for desulfurization of coking crude benzene, which belongs to the technical field of coking crude benzene production, and comprises a fractionation tower body, a steam generator connected to the lower end of the fractionation tower body side through a connecting pipe, a flow guide pipe arranged on the side wall of the fractionation tower body, and a steam conduit connected to the upper end of the fractionation tower body, wherein the end of the steam conduit away from the fractionation tower body is connected to a condenser, and a separation mechanism for separating sulfur-containing gas from crude benzene steam in cooperation with the steam generator is arranged inside the fractionation tower body. In the utility model, through the separation mechanism, the cooling path of the steam can be extended through the coordinated use of the separation hood, the flow guide hood and the collection hood, so that the heat exchange is more sufficient, and the separation efficiency between the sulfur-containing gas and the crude benzene is improved.

[0004] However, when the above-mentioned distillation tower is used, since the steam inside the distillation tower cannot be discharged quickly, on the one hand, it will affect the distillation efficiency, and on the other hand, it will easily cause the pressure inside the tower to increase, which is not conducive to use.

[0005] Therefore, it is necessary to provide a new cyclohexane dehydrogenation product crude benzene distillation separation device to solve the above technical problems. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a crude benzene distillation and separation device for cyclohexane dehydrogenation products, which solves the problem that when the existing distillation tower is used, the steam cannot be quickly discharged inside the distillation tower, which on the one hand affects the distillation efficiency, and on the other hand easily causes the pressure in the tower to increase, which is not conducive to use.

[0007] The crude benzene distillation separation device of cyclohexane dehydrogenation product provided by the utility model comprises a bottom plate, on which a distillation tower is fixed by a plurality of supporting legs, a liquid outlet pipe is connected to the bottom of the distillation tower, and a steam conduit is connected to the top of the distillation tower;

[0008] A liquid inlet pipe is connected to one side of the distillation tower, a support ring seat is fixed inside the distillation tower, a separation cover is fixed on the support ring seat, and an air outlet pipe is connected to the top of the separation cover;

[0009] A mounting frame is fixed at the bottom of the support ring seat, a rotating shaft is movably arranged on the mounting frame through a bearing, a plurality of exhaust blades are circumferentially fixed on the top of the rotating shaft, and a plurality of scattering blades are circumferentially installed on the bottom of the rotating shaft.

[0010] In a preferred embodiment, a first bevel gear is installed on the rotating shaft, a limiting seat is fixed inside the distillation tower, a transmission shaft is movably provided on the limiting seat through a bearing, a second bevel gear is installed at one end of the transmission shaft, and the second bevel gear is meshed with the first bevel gear.

[0011] In a preferred embodiment, a motor is fixed outside the distillation tower, and the output end of the motor is connected to the other end of the transmission shaft through a coupling.

[0012] In a preferred embodiment, a closed transmission is adopted between the first bevel gear and the second bevel gear.

[0013] In a preferred embodiment, a water storage tank is provided on the surface of the support ring seat, and a drainage pipe is provided at the bottom of the water storage tank.

[0014] In a preferred embodiment, a steam generator is installed on the bottom plate, and a steam outlet of the steam generator is connected to the distillation tower through a pipeline.

[0015] Beneficial effects of the utility model:

[0016] When the device is used, steam can be introduced into the distillation tower through the steam generator to contact the mixture entering from the liquid inlet pipe, so that the sulfur-containing impurities in the mixture are converted into steam and rise;

[0017] Before adding the mixture into the liquid inlet pipe, the motor is started. Under the transmission action of the first bevel gear and the second bevel gear, the rotating shaft will rotate. At this time, a plurality of breaking blades and exhaust blades will rotate simultaneously. By setting the breaking blades, the mixed solution entering from the liquid inlet pipe can be broken up to increase its contact area with the steam. By setting a plurality of exhaust blades, the speed at which the steam containing the mixture rises from the exhaust pipe can be accelerated, thereby improving the distillation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional view of the main structure of the crude benzene distillation and separation device for cyclohexane dehydrogenation products provided by the utility model;

[0019] Figure 2 A plan view of the main structure of the crude benzene distillation and separation device for cyclohexane dehydrogenation products provided by the utility model;

[0020] Figure 3 This is a schematic structural diagram of the exhaust blade provided by the utility model.

[0021] Numbers in the figure: 1. bottom plate; 2. supporting leg; 3. distillation tower; 4. liquid outlet pipe; 5. steam duct; 6. liquid inlet pipe; 7. supporting ring seat; 8. separation cover; 9. outlet pipe; 10. mounting frame; 11. rotating shaft; 12. exhaust blades; 13. breaking blades; 14. first bevel gear; 15. limiting seat; 16. transmission shaft; 17. second bevel gear; 18. motor; 19. water storage tank; 20. drain pipe; 21. steam generator. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0023] Please refer to Figure 1 , Figure 2 as well as Figure 3 ,in Figure 1 A three-dimensional view of the main structure of the crude benzene distillation and separation device for cyclohexane dehydrogenation products provided by the utility model; Figure 2 A plan view of the main structure of the crude benzene distillation and separation device for cyclohexane dehydrogenation products provided by the utility model; Figure 3 This is a schematic structural diagram of the exhaust blade provided by the utility model.

[0024] In the specific implementation process, Figure 1-Figure 3 As shown, it includes a bottom plate 1, on which a distillation tower 3 is fixed by a plurality of supporting legs 2, a liquid outlet pipe 4 is connected to the bottom of the distillation tower 3, a steam conduit 5 is connected to the top of the distillation tower 3, one end of the steam conduit 5 away from the distillation tower 3 is connected to an external condenser, and a liquid inlet pipe 6 is connected to one side of the distillation tower 3, and a steam generator 21 is installed on the bottom plate 1, and the steam outlet of the steam generator 21 is connected to the distillation tower 3 through a pipeline. Steam can be introduced into the distillation tower 3 through the steam generator 21 to contact the mixture entering from the liquid inlet pipe 4, so that the sulfur-containing impurities in the mixture are converted into steam and rise.

[0025] A support ring seat 7 is fixed inside the distillation tower 3, and a separation cover 8 is fixed on the support ring seat 7. The separation cover 8 is specifically conical, and an air outlet pipe 9 is connected to the top of the separation cover 8. A water storage tank 19 is opened on the surface of the support ring seat 7, and a drain pipe 20 is connected to the bottom of the water storage tank 19. If the mixture solution enters the top of the separation cover 8, it can fall into the water storage tank 19 under the action of gravity, and then be transferred to the outside of the distillation tower 3 through the drain pipe 20 to wait for treatment.

[0026] A mounting frame 10 is fixed at the bottom of the support ring seat 7, and a rotating shaft 11 is movably arranged on the mounting frame 10 through a bearing. A plurality of exhaust blades 12 are circumferentially fixed on the top of the rotating shaft 11, and a plurality of breaking blades 13 are circumferentially arranged on the bottom of the rotating shaft 11. A first bevel gear 14 is installed on the rotating shaft 11. A limiting seat 15 is fixed inside the distillation tower 3, and a transmission shaft 16 is movably arranged on the limiting seat 15 through a bearing. A second bevel gear 17 is installed at one end of the transmission shaft 16, and the second bevel gear 17 is meshed with the first bevel gear 14. A closed transmission is adopted between the first bevel gear 14 and the second bevel gear 17 to increase their service life.

[0027] A motor 18 is fixed to the outside of the distillation tower 3, and the output end of the motor 18 is connected to the other end of the transmission shaft 16 through a coupling. Before the mixture is added to the liquid inlet pipe 4, the motor 18 is started. Under the transmission action of the first bevel gear 14 and the second bevel gear 17, the rotating shaft 11 will rotate, and at this time, a plurality of breaking blades 13 and exhaust blades 14 will rotate simultaneously. By setting the breaking blades 13, the mixed solution entering from the liquid inlet pipe 4 can be broken up to increase its contact area with the steam. By setting a plurality of exhaust blades 14, the speed at which the steam containing the mixture rises from the outlet pipe 9 can be accelerated, thereby improving the distillation efficiency.

[0028] Working principle of the utility model: When the device is used, steam can be introduced into the distillation tower 3 through the steam generator 21 to contact the mixture entering from the liquid inlet pipe 4, so that the sulfur-containing impurities in the mixture are converted into steam and rise;

[0029] Before the mixture is added to the liquid inlet pipe 4, the motor 18 is started. Under the transmission action of the first bevel gear 14 and the second bevel gear 17, the rotating shaft 11 will rotate. At this time, the plurality of breaking blades 13 and the exhaust blades 14 will rotate simultaneously. By setting the breaking blades 13, the mixed solution entering from the liquid inlet pipe 4 can be broken up to increase its contact area with the steam. By setting the plurality of exhaust blades 14, the speed at which the steam containing the mixture rises from the exhaust pipe 9 can be accelerated to improve the distillation efficiency.

[0030] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0031] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cyclohexane dehydrogenation product crude benzene distillation separation device, comprising a bottom plate (1), characterized in that: A distillation tower (3) is fixed on the bottom plate (1) via a plurality of support legs (2); a liquid outlet pipe (4) is provided at the bottom of the distillation tower (3); and a steam conduit (5) is provided at the top of the distillation tower (3); A liquid inlet pipe (6) is connected to one side of the distillation tower (3), a support ring seat (7) is fixed inside the distillation tower (3), a separation cover (8) is fixed on the support ring seat (7), and an air outlet pipe (9) is connected to the top of the separation cover (8); A mounting frame (10) is fixed at the bottom of the support ring seat (7), a rotating shaft (11) is movably arranged on the mounting frame (10) via a bearing, a plurality of exhaust blades (12) are circumferentially fixed to the top of the rotating shaft (11), and a plurality of scattering blades (13) are circumferentially installed at the bottom of the rotating shaft (11).

2. The crude benzene distillation separation device for cyclohexane dehydrogenation product according to claim 1, characterized in that: A first bevel gear (14) is mounted on the rotating shaft (11); a limiting seat (15) is fixed inside the distillation tower (3); a transmission shaft (16) is movably arranged on the limiting seat (15) via a bearing; a second bevel gear (17) is mounted on one end of the transmission shaft (16); and the second bevel gear (17) is meshed with the first bevel gear (14).

3. The crude benzene distillation separation device for cyclohexane dehydrogenation product according to claim 2, characterized in that: A motor (18) is fixed outside the distillation tower (3), and an output end of the motor (18) is connected to the other end of the transmission shaft (16) via a coupling.

4. The crude benzene distillation separation device for cyclohexane dehydrogenation product according to claim 3, characterized in that: A closed transmission is adopted between the first bevel gear (14) and the second bevel gear (17).

5. The crude benzene distillation separation device for cyclohexane dehydrogenation product according to claim 4, characterized in that: A water storage tank (19) is provided on the surface of the support ring seat (7), and a drainage pipe (20) is provided at the bottom of the water storage tank (19).

6. The crude benzene distillation separation device for cyclohexane dehydrogenation product according to claim 5, characterized in that: A steam generator (21) is installed on the bottom plate (1), and a steam outlet of the steam generator (21) is connected to the distillation tower (3) through a pipeline.

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