Device for prolonging service life of hydrogenation catalyst
By adding a water washing tower before the recovered benzene enters the reactor and using the wastewater from the dehydration tower for washing, the problem of deactivation of the hydrogenation catalyst caused by extractant entrainment was solved, and the lifespan of the hydrogenation catalyst was extended.
Patent Information
- Application Number
- CN202422792122.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-11-15
AI Technical Summary
In the prior art, the extractant (DMAC) is entrained into the hydrogenation reactor, causing the hydrogenation catalyst to deactivate and reducing its service life.
A water washing tower is added before the recovered benzene enters the reactor. The wastewater from the dehydration tower is used to wash the recovered benzene to remove the extractant (DMAC). The washing effect is improved by using a rotating disc and mixing components.
It effectively removes extractant (DMAC) from recovered benzene, extends the service life of hydrogenation catalysts, and reduces catalyst loss.
Smart Images
Figure CN223587862U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of chemical equipment, especially point to the device of prolonging hydrogenation catalyst life. BACKGROUND
[0002] At present, in the production process of cyclohexanone, benzene is reacted with hydrogen under the action of hydrogenation catalyst to generate cyclohexene and cyclohexane under high temperature and high pressure, and the product is dehydrated by a dehydration tower and then enters a rectification system, and the unreacted benzene is separated from the rectification system under the action of an extractant (DMAC), and the unreacted benzene is mixed with the raw material benzene and then subjected to hydrogenation reaction again, but the benzene recovered in the extraction process will be mixed with a small amount of extractant (DMAC) and then enter the reactor, and the substance will cause the hydrogenation catalyst to be deactivated, reduce the service life of the hydrogenation catalyst, and cause the loss of the hydrogenation catalyst, therefore, it is an inevitable requirement to design a device or method for prolonging the service life of the hydrogenation catalyst. UTILITY MODEL CONTENT
[0003] The utility model discloses a device for prolonging the service life of a hydrogenation catalyst, which solves the problem of hydrogenation catalyst deactivation in the prior art.
[0004] To achieve the above object, the utility model provides the following technical scheme:
[0005] A device for prolonging the service life of a hydrogenation catalyst, comprising a water washing tower for washing raw materials, a wastewater pipeline arranged at the bottom of the water washing tower for discharging wastewater, a recycled benzene pipeline arranged at the lower side of the water washing tower for feeding materials, a water supply unit arranged at the upper side of the water washing tower for supplying water into the water washing tower, a benzene outlet pipeline arranged at the upper right side of the water washing tower for discharging benzene, and a tail gas pipeline arranged at the top of the water washing tower for discharging exhaust gas.
[0006] Based on the above technical scheme, the utility model further provides the following optional technical schemes:
[0007] In an optional scheme, the tail gas pipeline is connected with a combustion nozzle at the tail end.
[0008] In an optional scheme, the water supply unit comprises a process water pipeline connected with the water inlet end of the water washing tower, and a dehydration tower wastewater pipeline is communicated with the side surface of the process water pipeline.
[0009] In an alternative: the water washing tower is internally provided with a mixing component for mixing water and benzene, the mixing component comprises a central shaft matched with the position of the water washing tower axis, a rotating disc is fixed outside the central shaft, the rotating disc is rotationally connected with the inner wall of the water washing tower, a plurality of drain pipes for draining water are arranged on the bottom of the rotating disc, the axis of the drain pipes is arranged at an acute angle with the section of the rotating disc, and the reaction force generated by the water draining of the plurality of drain pipes constitutes a rotating torque, and a plurality of isolation net discs are arranged at the lower end of the central shaft, and a plurality of segmentation holes are arranged on the isolation net discs.
[0010] In an alternative: the water washing tower is internally provided with a mixing component for mixing water and benzene, the mixing component comprises a central shaft matched with the position of the water washing tower axis, a rotating disc is fixed outside the central shaft, the rotating disc is rotationally connected with the inner wall of the water washing tower, a plurality of drain pipes for draining water are arranged on the bottom of the rotating disc, the axis of the drain pipes is arranged at an acute angle with the section of the rotating disc, and the reaction force generated by the water draining of the plurality of drain pipes constitutes a rotating torque, and a plurality of isolation net discs are arranged at the lower end of the central shaft, and a plurality of segmentation holes are arranged on the isolation net discs.
[0011] In an alternative: the water washing tower is internally provided with a mixing component for mixing water and benzene, the mixing component comprises a central shaft matched with the position of the water washing tower axis, a rotating disc is fixed outside the central shaft, the rotating disc is rotationally connected with the inner wall of the water washing tower, a plurality of drain pipes for draining water are arranged on the bottom of the rotating disc, the axis of the drain pipes is arranged at an acute angle with the section of the rotating disc, and the reaction force generated by the water draining of the plurality of drain pipes constitutes a rotating torque, and a plurality of isolation net discs are arranged at the lower end of the central shaft, and a plurality of segmentation holes are arranged on the isolation net discs.
[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0013] In the utility model, according to the characteristics that the extractant (DMAC) is decomposed and dissolved in water, a water washing tower is additionally arranged before the recovered benzene enters the reactor, and the wastewater generated after dehydration in the dehydration tower is fully utilized to wash the recovered benzene, so that the extractant (DMAC) entrained in the recovered benzene is removed, the consumption of the hydrogenation catalyst is reduced, the loss of the hydrogenation catalyst is avoided, and the utility is strong. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the structural schematic view of the utility model embodiment 1.
[0015] Figure 2 It is the structural schematic view of the utility model embodiment 2
[0016] The figure mark note: process water pipeline 1, dehydration tower wastewater pipeline 2, recovered benzene pipeline 3, water washing tower 4, benzene outlet pipeline 5, wastewater pipeline 6, tail gas pipeline 7;
[0017] Rotating disc 8, drain pipe 9, isolation net disc 10, central shaft 11, buffer disc 12. DETAILED DESCRIPTION
[0018] The technical scheme in the utility model embodiments will be described clearly and completely below in combination with the drawings in the utility model embodiments, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.
[0019] Embodiment 1
[0020] As Figure 1 The utility model discloses a device that prolongs the life of hydrogenation catalyst, including the water washing tower 4 for washing raw materials, the water washing tower 4 bottom is equipped with the waste water pipeline 6 for discharging waste water, the water washing tower 4 downside is equipped with the recovery benzene pipeline 3 for feeding, the water washing tower 4 upside is equipped with the water supply unit for sending water source to its inside, and the benzene that floats is washed through water supply unit, the water washing tower 4 right upside is equipped with the benzene pipeline 5 for discharging benzene, the water washing tower 4 top is equipped with the tail gas pipeline 7 for discharging gas, and the benzene is sent into the water washing tower 4 inside through recovery benzene pipeline 3, and washing is completed in the water washing tower 4, and the extractant (DMAC) of benzene entrainment in recovery benzene pipeline 3 is removed, and the benzene after washing is entered reactor and carries out hydrogenation reaction again through the benzene pipeline 5 after washing, and the waste water after washing enters waste water system through waste water pipeline 6, when the pressure in the water washing tower 4 is high, sends into the flare position emptying combustion through tail gas pipeline 7:
[0021] The water supply unit includes a process water pipeline 1 connected to the water inlet end of the water washing tower 4, and a dehydration tower waste water pipeline 2 is in communication with the side surface of the process water pipeline 1, so that sufficient water source can be provided for the water washing tower.
[0022] Embodiment 2
[0023] As Figure 2 The difference between the embodiment 1 and the embodiment 2 is that: the water washing tower 4 is internally provided with a mixing component for fully mixing water and benzene, the mixing component includes a central shaft 11 matched with the axis position of the water washing tower 4, a rotating disc 8 is fixedly arranged outside the central shaft 11, the rotating disc 8 is rotatably connected with the inner wall of the water washing tower 4, a plurality of water leakage pipes 9 for draining water are arranged in an array at the bottom of the rotating disc 8, the axis of the water leakage pipes 9 is arranged at an acute angle with the cross section of the rotating disc 8, and the reaction force generated by the water leakage pipes 9 for draining water forms a rotating torque, so that the rotating disc 8 can rotate, a plurality of isolation mesh discs 10 are arranged at the lower end of the central shaft 11, a plurality of segmentation holes are arranged on the isolation mesh discs 10, the benzene is segmented by the segmentation holes, so that the benzene can be better contacted with water, and the water washing effect is improved.
[0024] A buffer disc 12 is fixedly arranged in the water washing tower 4, the buffer disc 12 is in communication with the recovery benzene pipeline 3, and a plurality of gas outlet holes are arranged at the upper end of the buffer disc 12, so that the benzene can be further dispersed.
[0025] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. An apparatus for prolonging the life of a hydroprocessing catalyst, comprising a water wash column (4) for washing a feedstock, characterized in that: The bottom of the water washing tower (4) is provided with a wastewater pipeline (6) for discharging wastewater, the lower side of the water washing tower (4) is provided with a recovered benzene pipeline (3) for feeding, the upper side of the water washing tower (4) is provided with a water supply unit for feeding water into the interior of the water washing tower (4), the upper right side of the water washing tower (4) is provided with a benzene discharge pipeline (5) for discharging benzene, and the top of the water washing tower (4) is provided with an exhaust pipeline (7) for discharging exhaust gas. The interior of the water washing tower (4) is provided with a mixing component for fully mixing water and benzene, the mixing component comprises a central shaft (11) matched with the position of the axis of the water washing tower (4), the outer side of the central shaft (11) is fixedly provided with a rotating disc (8), the outer side of the rotating disc (8) is rotationally connected with the inner wall of the water washing tower (4), the bottom of the rotating disc (8) is arrayed with a plurality of water leakage pipes (9) for discharging water, the axis of the water leakage pipe (9) is arranged at an acute angle with the tangent plane of the rotating disc (8), and the reaction force generated by the water discharge of the plurality of water leakage pipes (9) constitutes a rotating torque, and the lower end of the central shaft is provided with a plurality of isolation mesh discs (10), and the isolation mesh disc (10) is arrayed with a plurality of segmentation holes.
2. The apparatus for prolonging the life of a hydrogenation catalyst of claim 1, wherein, The tail of the exhaust pipeline (7) is connected with a combustion nozzle.
3. The apparatus for prolonging the life of a hydrogenation catalyst of claim 1, wherein, The water supply unit comprises a process water pipeline (1) connected with the water inlet end of the water washing tower (4), and the side of the process water pipeline (1) is communicated with a dehydration tower wastewater pipeline (2).
4. The apparatus for prolonging the life of a hydrogenation catalyst of claim 1, wherein, The interior of the water washing tower (4) is fixedly provided with a buffer disc (12), the buffer disc (12) is communicated with the recovered benzene pipeline (3), and the upper end of the buffer disc (12) is arrayed with a plurality of gas outlet holes.
5. The apparatus for prolonging the life of a hydrogenation catalyst of claim 4, wherein, The diameter of the buffer disc (12) is smaller than the diameter of the water washing tower (4).