A pretreatment device for hydrogenation reactor catalyst

Abstract

The utility model provides a pretreatment device for a hydrogenation reactor catalyst, and relates to the technical field of catalysts. A pretreatment device for a hydrogenation reactor catalyst comprises a hydrogenation reactor, an activation pipeline and a deactivation pipeline respectively connected to the bottom of the hydrogenation reactor, an activation sewage pipeline and a deactivation sewage pipeline respectively connected to the top of the hydrogenation reactor, and a deactivation pool respectively connected to the deactivation pipeline and the deactivation sewage pipeline, wherein a deactivation solution is arranged in the deactivation pool, an alkali solution pipeline and a desalted water pipeline are also connected to the activation pipeline, the hydrogenation reactor is also connected to a nitrogen pipeline and a hydrogen pipeline, and a Raney nickel bed is arranged in the hydrogenation reactor. It can perform online activation and online deactivation treatment on the catalyst in the hydrogenation reactor, saves costs, is not prone to explosion, and has high safety.

Description

Technical Field

[0001] The utility model relates to the technical field of catalysts, in particular to a pretreatment device for a hydrogenation reactor catalyst. Background Art

[0002] Raney nickel is commonly used as a hydrogenation catalyst. Its dust is highly chemically active and can cause oxidation reactions or even spontaneous combustion when exposed to air. It can also cause nickel dermatitis, also known as "itch", which is severe itching of the skin, followed by papules and erythema, and in severe cases, suppuration and ulceration. Long-term inhalation can cause respiratory irritation, chronic rhinitis, and even nasal septum perforation, which poses a great safety risk.

[0003] In order to avoid the serious consequences of spontaneous combustion during the loading and unloading of catalysts in the organic material hydrogenation reactor, activated catalysts are usually used. However, this will increase the cost of the catalyst, and the catalyst may also produce hydrogen and explode during the handling and shipping process. Utility Model Content

[0004] The utility model aims to provide a pretreatment device for a hydrogenation reactor catalyst, which can perform online activation and online deactivation treatment on the catalyst in the hydrogenation reactor, saves costs, is not prone to explosion, and has high safety.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A pretreatment device for a hydrogenation reactor catalyst comprises a hydrogenation reactor, an activation pipeline and a deactivation pipeline respectively connected to the bottom of the hydrogenation reactor, an activation sewage pipeline and a deactivation sewage pipeline respectively connected to the top of the hydrogenation reactor, and a deactivation tank respectively connected to the deactivation pipeline and the deactivation sewage pipeline, wherein a deactivation solution is arranged in the deactivation tank, an alkali solution pipeline and a desalted water pipeline are further connected to the activation pipeline, a nitrogen pipeline and a hydrogen pipeline are further connected to the hydrogenation reactor, and a Raney nickel bed is arranged in the hydrogenation reactor.

[0007] Furthermore, the activation pipeline is provided with an activation pump, the deactivation pipeline is provided with a deactivation pump, and the activation pipeline is also connected to a steam pipeline.

[0008] Furthermore, a sodium nitrate solution with a concentration of 20-30% is provided in the deactivation tank.

[0009] Furthermore, a feed pipeline is connected to the bottom of the hydrogenation reactor, a feed hand valve is arranged on the feed pipeline, a blind plate is inserted at the rear flange of the check valve behind the feed hand valve, and a blind plate is inserted at the rear flange of the check valve behind the hydrogen pipeline.

[0010] Furthermore, a vent line is connected to the upper part of the hydrogenation reactor, and the nitrogen pipeline is connected to the interior of the hydrogenation reactor through the vent line.

[0011] Furthermore, the top of the hydrogenation reactor is connected to a storage tank via a discharge pipeline.

[0012] Furthermore, a filter screen is provided at the material outlet of the hydrogenation reactor.

[0013] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0014] In the utility model, the activation pipeline, desalted water pipeline, alkali solution pipeline, nitrogen pipeline and activated sewage pipeline cooperate to activate the Raney nickel bed in the hydrogenation reactor, reduce the aluminum content of the Raney nickel bed, improve its activity, and make its utilization rate in the hydrogenation reactor higher; at the same time, it is always protected by nitrogen to ensure its safety after being put into use. The deactivation pipeline, deactivation tank, deactivation solution, desalted water pipeline and deactivated sewage pipeline cooperate to deactivate the Raney nickel bed in the hydrogenation reactor after use, because the Raney nickel bed after use may still have a certain activity, and after deactivation treatment, it can be made inactive, effectively avoiding its explosion and ensuring its safety during unloading. The hydrogen pipeline, hydrogenation reactor and Raney nickel bed cooperate to process the materials in the hydrogenation reactor, and the Raney nickel bed can improve the material processing efficiency after activation treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of a pretreatment device for a hydrogenation reactor catalyst provided in Example 1 of the utility model.

[0017] Icons: 1-hydrogenation reactor, 2-Raney nickel bed, 3-filter, 4-activation pipeline, 5-deactivation pipeline, 6-sewage main pipeline, 7-activated sewage pipeline, 8-deactivated sewage pipeline, 9-deactivation tank, 10-nitrogen pipeline, 11-hydrogen pipeline, 12-steam pipeline, 13-desalted water pipeline, 14-alkali solution pipeline, 15-feed pipeline, 16-activation pump, 17-deactivation pump, 18-discharge pipeline, 19-storage tank, 20-vent pipeline. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example 1

[0024] like Figure 1As shown, this embodiment provides a pretreatment device for a hydrogenation reactor catalyst, comprising a hydrogenation reactor 1, an activation pipeline 4 and a deactivation pipeline 5 respectively connected to the bottom of the hydrogenation reactor 1, an activation sewage pipeline 7 and a deactivation sewage pipeline 8 respectively connected to the top of the hydrogenation reactor 1, and a deactivation tank 9 respectively connected to the deactivation pipeline 5 and the deactivation sewage pipeline 8, wherein a deactivation solution is arranged in the deactivation tank 9, an alkali solution pipeline 14 and a desalted water pipeline 13 are further connected to the activation pipeline 4, the hydrogenation reactor 1 is further connected to a nitrogen pipeline 10 and a hydrogen pipeline 11, and a Raney nickel bed 2 is arranged in the hydrogenation reactor 1.

[0025] It should be noted that valves are provided on all pipelines involved in this embodiment. The activation pipeline 4, the desalted water pipeline 13, the alkali solution pipeline 14, the nitrogen pipeline 10 and the activated sewage pipeline 7 cooperate to activate the Raney nickel bed 2 in the hydrogenation reactor 1, reduce the aluminum content of the Raney nickel bed 2, improve its activity, and make its utilization rate in the hydrogenation reactor 1 higher; at the same time, it is always in nitrogen protection to ensure safety after being put into use. The deactivation pipeline 5, the deactivation tank 9, the deactivation solution, the desalted water pipeline 13 and the deactivated sewage pipeline 8 cooperate to deactivate the Raney nickel bed 2 in the hydrogenation reactor 1 after use, because the Raney nickel bed 2 after use may still have a certain activity, and after deactivation treatment, it can be made inactive, effectively avoiding its explosion, and ensuring the safety of the catalyst when unloading. The hydrogen pipeline 11, the hydrogenation reactor 1 and the Raney nickel bed 2 cooperate to process the material in the hydrogenation reactor 1, and the Raney nickel bed 2 can improve the material processing efficiency after activation. Among them, the activated sewage pipeline 7 and the deactivated sewage pipeline 8 are both connected to the sewage main pipeline 6, and the sewage main pipeline 6 is connected to the outlet of the hydrogenation reactor 1.

[0026] In the present embodiment, an activation pump 16 is provided on the activation pipeline 4, a deactivation pump 17 is provided on the deactivation pipeline 5, and a steam pipeline 12 is also connected to the activation pipeline 4. The activation pump 16 and the valve can control the flow of desalted water and alkali solution in the hydrogenation reactor 1 to achieve the activation of the Raney nickel catalyst. The deactivation pump 17 and the valve can control the circulation of the deactivated solution in the hydrogenation reactor 1 to achieve the deactivation of the Raney nickel catalyst. Since the temperature of the desalted water will affect the activation of the Raney nickel catalyst by the alkali solution during the activation process, steam can be introduced into the hydrogenation reactor 1 by the steam pipeline 12, so as to maintain the temperature of the desalted water at about 25°C, so as to ensure that the alkali solution has a good activation effect on the Raney nickel catalyst.

[0027] In this embodiment, the deactivation solution is a sodium nitrate solution with a concentration of 20-30%. The sodium nitrate solution reacts with the Raney nickel catalyst to reduce the activity of the Raney nickel catalyst, making it easier to unload the Raney nickel catalyst later.

[0028] In this embodiment, the bottom of the hydrogenation reactor 1 is connected to a feed pipeline 15, on which a feed hand valve is provided, a blind plate is inserted at the rear flange of the check valve behind the feed hand valve, and a blind plate is inserted at the rear flange of the check valve behind the hydrogen pipeline 11. The feed pipeline 15 is used to deliver unsaturated materials into the hydrogenation reactor 1, and the materials can be processed after the catalyst is activated. The blind plate can form a sealed and isolated space on both sides of the rear check valve, which plays a role in medium isolation. Among them, the feed pipeline 15 is connected to the activation pipeline 4 and the deactivation pipeline 5 respectively.

[0029] In this embodiment, a vent line 20 is connected to the upper part of the hydrogenation reactor 1, and the nitrogen pipeline 10 is connected to the inside of the hydrogenation reactor 1 through the vent line 20. The vent line 20 is used to discharge oxygen in the hydrogenation reactor 1 to prevent oxygen from reacting with the catalyst.

[0030] In this embodiment, the top of the hydrogenation reactor 1 is connected to a storage tank 19 through a discharge pipeline 18. After the hydrogenation reactor 1 processes the unsaturated material, the material is discharged through the discharge pipeline 18 and stored in the storage tank 19, so as to facilitate the subsequent deactivation treatment of the catalyst.

[0031] In this embodiment, a filter screen 3 is provided at the material outlet of the hydrogenation reactor 1. The filter screen 3 can filter impurities in the material to improve the purity of the treated material (i.e., improve the purity of the material in the storage tank 19).

[0032] The activation principle of the pretreatment device of the hydrogenation reactor catalyst is as follows (initially, all valves on the pipelines are closed):

[0033] 1) Bypass hydrogenation reactor 1 has low pressure interlock;

[0034] 2) Open the valve on the nitrogen pipeline 10;

[0035] 3) The pressure of the hydrogenation reactor 1 was adjusted to 650 KPa, and after maintaining the pressure for 15 minutes, the pressure of the hydrogenation reactor 1 was reduced to 350 KPa;

[0036] 4) Repeat step 3 until the oxygen content of the vented gas is less than 2%;

[0037] 5) After the nitrogen replacement is qualified, the pressure of the hydrogenation reactor 1 is adjusted to 350KPa;

[0038] 6) Open the valves on the sewage main pipeline 6, the activated sewage pipeline 7, the activated pipeline 4 and the desalted water pipeline 13, start the activation pump 16, and adjust the desalted water flow rate to 13600 kg / h;

[0039] 7) Control the liquid level of hydrogenation reactor 1 at 60%, connect the steam to the ejector and connect it to steam pipeline 12, set the temperature controller to 25°C, and determine whether to open the valve on steam pipeline 12 according to the water temperature;

[0040] 8) Start catalyst activation, the activation water flow rate is 13600kg / h, the alkali solution flow rate is 250-600kg / h, the liquid level of hydrogenation reactor 1 is 60%, the pressure of hydrogenation reactor 1 is 350KPa, the top temperature is <50°C, and the activation time is 8-10h;

[0041] 9) Calculate the aluminum removal rate based on the alkali solution consumption and the change in the outlet concentration of the hydrogenation reactor 1. When the aluminum content drops to 52%, close the valve on the alkali solution pipeline 14 and continue to flush the hydrogenation reactor 1 with desalted water for 4 hours or until the pH value of the outlet water is lower than 8;

[0042] 10) After the water washing is completed, the activation pump 16 is stopped, the valves on the sewage main pipeline 6, the activated sewage pipeline 7 and the activation pipeline 4 are closed, the pressure interlock bypass of the hydrogenation reactor 1 is cancelled, the hydrogenation reactor 1 is kept at a pressure of 4 bar, and is in a state of waiting for material to start, and the activation is completed.

[0043] The deactivation principle of the pretreatment unit for the hydrogenation reactor catalyst is as follows:

[0044] 1) Confirm that the catalyst in hydrogenation reactor 1 has cooled to 40°C, close the valve on feed line 15, and control the pressure in hydrogenation reactor 1 at 350KPa;

[0045] 2) Discharge the material in the hydrogenation reactor 1 to the storage tank 19 through the discharge pipeline 18, and close the valve on the discharge pipeline 18;

[0046] 3) Open the valve of the desalted water pipeline 13 and inject water into the hydrogenation reactor 1. The water source pressure must be greater than 3.5 bar;

[0047] 4) Repeat the steps of filling with water and discharging until the explosiveness of the vented gas is less than 5% and the TOC is less than 3000ppm; then maintain the liquid level of hydrogenation reactor 1 at 60%, release the pressure of hydrogenation reactor 1 to 0.7bar, insert a blind plate on the flange behind the check valve behind the valve of feed pipeline 15, and insert a blind plate on the flange behind the check valve of hydrogen pipeline 11;

[0048] 5) Add water to the deactivation tank 9 until the water level is 50%, and then add sodium nitrate to the tank to prepare a concentration of 20-30%;

[0049] 6) Connect an external water source to the inlet of the deactivation pump 17, close the outlet valve of the deactivation pump 17, open the outlet exhaust drain of the deactivation pump 17, prime the deactivation pump 17, open the valve on the self-circulation pipeline, start the deactivation pump 17, and circulate the material in the deactivation tank 9;

[0050] 7) Open all valves from the top of the hydrogenation reactor 1 to the deactivation tank 9, open the valves of the deactivation pipeline 5 and the feed pipeline 15, and allow the deactivated solution to circulate through the hydrogenation reactor 1;

[0051] 8) Check whether the flow rate returns from the hydrogenation reactor 1 to the deactivation tank 9 to confirm that deactivation is occurring;

[0052] 9) After deactivation is completed, switch to desalted water for cleaning until there is no ammonia smell at the outlet, pump the solution in the deactivation tank 9 to the wastewater treatment facility outside the boundary area, fill the hydrogenation reactor 1 with the deactivation solution, and wait for the catalyst to be safely unloaded.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pretreatment device for a hydrogenation reactor catalyst, characterized in that: The invention comprises a hydrogenation reactor, an activation pipeline and a deactivation pipeline respectively connected to the bottom of the hydrogenation reactor, an activation sewage pipeline and a deactivation sewage pipeline respectively connected to the top of the hydrogenation reactor, and a deactivation tank respectively connected to the deactivation pipeline and the deactivation sewage pipeline, wherein a deactivation solution is arranged in the deactivation tank, an alkali solution pipeline and a desalted water pipeline are also connected to the activation pipeline, a nitrogen pipeline and a hydrogen pipeline are also connected to the hydrogenation reactor, and a Raney nickel bed is arranged in the hydrogenation reactor.

2. The pretreatment device for the hydrogenation reactor catalyst according to claim 1, characterized in that: The activation pipeline is provided with an activation pump, the deactivation pipeline is provided with a deactivation pump, and the activation pipeline is also connected with a steam pipeline.

3. The pretreatment device for the hydrogenation reactor catalyst according to claim 1, characterized in that: The deactivation solution is a sodium nitrate solution with a concentration of 20-30%.

4. The pretreatment device for the hydrogenation reactor catalyst according to claim 1, characterized in that: A feed pipeline is connected to the bottom of the hydrogenation reactor, a feed hand valve is arranged on the feed pipeline, a blind plate is inserted at the rear flange of the check valve behind the feed hand valve, and a blind plate is inserted at the rear flange of the check valve behind the hydrogen pipeline.

5. The pretreatment device for the hydrogenation reactor catalyst according to claim 1, characterized in that: A vent line is connected to the upper portion of the hydrogenation reactor, and the nitrogen pipeline is communicated with the interior of the hydrogenation reactor through the vent line.

6. The pretreatment device for the hydrogenation reactor catalyst according to claim 1, characterized in that: The top of the hydrogenation reactor is connected with a storage tank through a discharge pipeline.

7. The pretreatment device for the hydrogenation reactor catalyst according to claim 1, characterized in that: The material outlet of the hydrogenation reactor is provided with a filter.

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