Nickel-based catalyst continuous passivation device

Abstract

A continuous passivation device for a nickel-based catalyst comprises an external water pipeline, a water diversion tank, a conveying pipeline, a centrifugal pump, a liquid drainage pipeline, an inlet pipeline, a reactor, an outlet pipeline, a main pool, a main pool pipeline, an overflow pool and an overflow pool pipeline. The lower part of the water diversion tank is connected with an external water pipeline, a main pool pipeline and an overflow pool pipeline connected with the bottom are respectively arranged at the bottoms of the main pool and the overflow pool, and a conveying pipeline at the bottom of the water diversion tank is connected with the inlet end of the centrifugal pump; the outlet end of the centrifugal pump is connected with the inlet end of the reactor through an inlet pipeline, the outlet pipeline connected with the outlet end of the reactor is arranged in the middle of the main pool, the main pool and the overflow pool are located 2 meters below the horizontal ground, and the water diversion tank and the centrifugal pump are located on the horizontal ground. Water in the water diversion tank is not only used for cooling a system, but also in a vacuum state due to the fact that part of liquid is extracted, the generated pressure difference can keep that a sodium nitrate solution is continuously sucked into the water diversion tank to perform passivation reaction on a catalyst, and the continuity of the whole passivation process is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of fine chemical industry, in particular to a nickel-based catalyst continuous passivation device. Background Art

[0002] The porous structure of Raney nickel catalysts significantly increases their surface area, resulting in high catalytic activity. They are widely used in hydrogenation reactions in organic synthesis and industrial production. Currently, many important fields, such as fine chemicals, petrochemicals, and pharmaceuticals, rely on Raney nickel catalysts. In the fine chemical sector, a large number of processes require Raney nickel catalysts, such as hydrogenation, dehydrogenation, oxidation, alkylation, and esterification.

[0003] The catalyst needs to be replaced after a period of use. To replace the catalyst in the reactor, the catalyst needs to be passivated. Currently, a sodium nitrate solution is generally used to perform a passivation reaction on the used nickel-based catalyst, forming a nickel oxide film, which is then removed and replaced with a new catalyst. However, this passivation reaction is exothermic, and the heat generated cannot be dissipated, causing the liquid temperature to be too high. This in turn causes cavitation and unstable pressure in the centrifugal pump that transports the material. Moreover, since the main tank and overflow tank used for the existing catalyst replacement are located 2 meters below the horizontal ground, the workload of the centrifugal pump is further increased, causing the centrifugal pump to fail to operate normally. This process not only causes damage to the centrifugal pump, but also prevents the continuous extraction of sodium nitrate solution, interrupting the passivation reaction. Utility Model Content

[0004] In order to solve the defects of existing centrifugal pumps such as cavitation and inability to continuously extract sodium nitrate solution, which leads to the inability to continuously carry out the nickel-based catalyst replacement process, the purpose of the utility model is to provide a nickel-based catalyst continuous passivation device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a nickel-based catalyst continuous passivation device, including an external water pipe 1, a water diversion tank 2, a delivery pipe 3, a centrifugal pump 4, a drainage pipe 5, an inlet pipe 6, a reactor 7, an outlet pipe 8, a main pool 9, a main pool pipe 10, an overflow pool 11, and an overflow pool pipe 12.

[0006] The lower part of the water diversion tank 2 is connected to the external water pipe 1, and the main pool pipe 10 and the overflow pool pipe 12 connected to the bottom of the water diversion tank 2 are respectively placed at the bottom of the main pool 9 and the overflow pool 11, and the delivery pipe 3 at the bottom of the water diversion tank 2 is connected to the inlet end of the centrifugal pump 4.

[0007] The outlet end of the centrifugal pump 4 is connected to the inlet end of the reactor 7 through an inlet pipe 6 and is connected to the outside through a drainage pipe 5.

[0008] The outlet pipe 8 connected to the outlet end of the reactor 7 is placed in the middle of the main pool 9.

[0009] Furthermore, the main pool 9 and the overflow pool 11 are located 2 meters below the horizontal ground, and the water diversion tank 2 and the centrifugal pump 4 are located on the horizontal ground.

[0010] Compared with the existing method, the utility model has the following advantages.

[0011] The utility model provides a nickel-based catalyst continuous passivation device, which uses a centrifugal pump 4 to extract water from a water diversion tank 2 filled with water at the same height, so that the centrifugal pump 4 is filled with water, which is conducive to cooling and avoiding cavitation of the centrifugal pump.

[0012] The utility model provides a nickel-based catalyst continuous passivation device. The water diversion tank 2 is in a vacuum state due to the suction of the centrifugal pump 4, which is conducive to the extraction of sodium nitrate solution in the main tank 9 and the overflow tank 11. It not only maintains the operation of the centrifugal pump 4, but also realizes the continuous supply of sodium nitrate solution, thereby ensuring the continuity of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a system diagram of a nickel-based catalyst continuous passivation device of the utility model. DETAILED DESCRIPTION

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be noted that the terms "top", "bottom", "one side", "the other side", "front", "back", "middle", "inside", "top", "bottom end", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, for example, they can mean fixed connection, detachable connection, or integral connection; they can mean mechanical connection or electrical connection; they can mean direct connection, indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] The present invention will be described in further detail below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, the utility model provides a nickel-based catalyst continuous passivation device, including an external water pipe 1, a water diversion tank 2, a delivery pipe 3, a centrifugal pump 4, a drainage pipe 5, an inlet pipe 6, a reactor 7, an outlet pipe 8, a main pool 9, a main pool pipe 10, an overflow pool 11, and an overflow pool pipe 12.

[0018] The lower part of the water diversion tank 2 is connected to the external water pipe 1, and the external water fills the water diversion tank 2. The centrifugal pump 4 extracts water from the water diversion tank 2 through the delivery pipe 3, and enters the reactor 7 through the inlet pipe 6 to cool the reactor 7.

[0019] The outlet pipe 8 connected to the outlet end of the reactor 7 is placed in the middle of the main pool 9. The water in the reactor 7 enters the main pool 9 and reacts with the sodium nitrate solid in the main pool 9 to form a sodium nitrate solution.

[0020] Because part of the water is extracted from the water diversion tank 2, a vacuum is formed inside the water diversion tank 2, forming a pressure difference with the outside world. Due to the pressure difference, part of the sodium nitrate solution in the main pool 9 is sucked into the water diversion tank 2 through the main pool pipe 10, and then is extracted by the centrifugal pump 4 through the delivery pipe 3, so that the sodium nitrate solution continues to enter the reactor 7 through the inlet pipe 6. The nickel-based catalyst in the reactor 7 undergoes a passivation reaction with the sodium nitrate solution to form a nickel oxide film.

[0021] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0022] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A nickel-based catalyst continuous passivation device, comprising an external water pipe (1), a water diversion tank (2), a delivery pipe (3), a centrifugal pump (4), a drainage pipe (5), an inlet pipe (6), a reactor (7), an outlet pipe (8), a main tank (9), a main tank pipe (10), an overflow tank (11), and an overflow tank pipe (12), characterized in that: The lower part of the water diversion tank (2) is connected to the external water pipe (1); the main pool pipe (10) and the overflow pool pipe (12) connected to the bottom of the water diversion tank (2) are respectively placed at the bottom of the main pool (9) and the overflow pool (11); the delivery pipe (3) at the bottom of the water diversion tank (2) is connected to the inlet end of the centrifugal pump (4); the outlet end of the centrifugal pump (4) is connected to the inlet end of the reactor (7) through the inlet pipe (6); the outlet pipe (8) connected to the outlet end of the reactor (7) is placed in the middle of the main pool (9); the main pool (9) and the overflow pool (11) are located 2 meters below the horizontal ground; the water diversion tank (2) and the centrifugal pump (4) are located on the horizontal ground.

2. A nickel-based catalyst continuous passivation device according to claim 1, characterized in that The outlet end of the centrifugal pump (4) is connected to the outside world via a drainage pipe (5).

Images