Vacuum displacement device for a tertiary amine production catalyst

Abstract

The utility model discloses a tertiary amine production catalyst vacuum displacement device, including vacuum displacement jar, the bottom end of vacuum displacement jar is equipped with gas transmission mechanism, and gas transmission mechanism includes the air distribution port connector of being equipped with in the bottom end of vacuum displacement jar, and the air distribution port connector below is equipped with annular distribution main pipe, and the air distribution port connector top is connected with a plurality of lift tubes, and the lift tube passes through air distribution port connector and extends into vacuum displacement jar inside upwards, and the air distribution port connector top is connected with the grating net, the utility model discloses a gas transmission mechanism that is composed of annular distribution main pipe and a plurality of lift tubes is set up in the bottom of vacuum displacement jar, and after inert gas is evenly shunted through annular main pipe, and from a plurality of lift tubes synchronous into jar body inside, forms the multi -point gas -intaking mode, makes gas can even penetrate the whole catalyst bed, and the thoroughness and efficiency of oxygen replacement are improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of vacuum displacement technology, and more specifically, to a vacuum displacement device for a catalyst in the production of tertiary amines. Background Technology

[0002] In the industrial production of tertiary amine compounds, supported noble metal catalysts or skeletal nickel catalysts are widely used for catalytic hydrogenation reactions. These catalysts have the advantages of high activity and high selectivity, but they also pose a significant risk of oxidation by readily reacting with oxygen in the air. This is especially true when the catalyst is activated, regenerated, or reused after long-term storage. Direct exposure to air can lead to catalyst deactivation, or even spontaneous combustion or explosion. To ensure production safety and catalyst activity, the catalyst must undergo vacuum purging under inert gas protection before being loaded into the reactor.

[0003] Currently, most common catalyst vacuum replacement devices are simple, sealed containers with a single air inlet and outlet at the top. This traditional single-point air inlet method causes inert gas to concentrate in a certain area at the bottom, easily leading to "airflow short-circuiting" or "channeling" phenomena. This makes it difficult to uniformly penetrate the entire catalyst bed, resulting in incomplete local replacement. Residual oxygen may pose safety risks to subsequent operations. Furthermore, during the vacuuming process, fine catalyst dust may be carried into the extraction pipeline by the high-speed airflow, causing damage to the vacuum pump, valve blockage, or system contamination, affecting the normal operation of the equipment. Utility Model Content

[0004] In view of the problems in the related technologies, this utility model proposes a vacuum replacement device for catalysts in the production of tertiary amines, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] Therefore, the specific technical solution adopted by this utility model is as follows:

[0006] A vacuum displacement device for a catalyst in the production of tertiary amines includes a vacuum displacement tank. The bottom of the vacuum displacement tank is provided with a gas conveying mechanism. The gas conveying mechanism includes a gas distribution port pipe located at the bottom of the vacuum displacement tank. Below the gas distribution port pipe is a ring-shaped distribution main pipe. Above the ring-shaped distribution main pipe are multiple riser pipes. The riser pipes pass upward through the gas distribution port pipe and extend into the interior of the vacuum displacement tank. An installation flange plate is provided on the outside of the riser pipe. The installation flange plate is bolted to the gas distribution port pipe. A grid is connected above the gas inlet pipe.

[0007] Furthermore, the outer side of the annular distribution main pipe is connected to a mounting ear, which is connected to a support frame, and the support frame is fixed to the outer wall of the vacuum replacement tank.

[0008] Furthermore, the ring-shaped distribution main pipe is connected to an external inert gas source via a gas delivery pipe.

[0009] Furthermore, the top of the vacuum replacement tank is equipped with a sealing cap, and the sealing cap is connected to the outside of the vacuum replacement tank by a flange.

[0010] Furthermore, a vacuum extraction port is connected to the top of the sealing cap.

[0011] Furthermore, a protective cover is connected to the outside of the vacuum extraction port. The protective cover is located inside the sealing cover and is connected to the sealing cover via a connecting rod. The protective cover is a stainless steel wire mesh structure.

[0012] Furthermore, a vent pipe is connected to one side of the sealing cap, a valve is installed on the vent pipe, and a pressure sensor is installed on one side of the vent pipe, with the pressure sensor threadedly connected to the sealing cap.

[0013] Furthermore, a feed pipe is connected to the middle of the sealing cap, and a feed valve is installed on the feed pipe. A discharge pipe is connected to the bottom of the vacuum replacement tank, and a discharge valve is installed on the discharge pipe.

[0014] The beneficial effects of this utility model are as follows:

[0015] (1) By setting a gas delivery mechanism consisting of an annular distribution main pipe and multiple riser pipes at the bottom of the vacuum replacement tank, the inert gas is evenly distributed through the annular main pipe and then simultaneously enters the tank from multiple riser pipes, forming a multi-point gas intake mode. This design effectively avoids the "airflow short circuit" or "channeling" phenomenon caused by traditional single-point gas intake, enabling the gas to penetrate the entire catalyst bed evenly, significantly improving the thoroughness and efficiency of oxygen replacement, ensuring that the catalyst is in a completely inert protected state before loading, and reducing the risk of oxidation deactivation and combustion explosion.

[0016] (2) A protective cover made of stainless steel wire mesh is installed below the vacuum pump port, which can effectively intercept the catalyst dust carried by the airflow, prevent it from entering the pumping pipe, and avoid damage to the vacuum pump, valve blockage or system pollution. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of a vacuum displacement apparatus for producing a tertiary amine catalyst according to an embodiment of the present invention;

[0019] Figure 2 This is a side view of a vacuum displacement apparatus for producing a tertiary amine catalyst according to an embodiment of the present invention;

[0020] Figure 3 This is an internal structural diagram of a vacuum displacement device for producing a tertiary amine catalyst according to an embodiment of the present invention;

[0021] Figure 4 This is an enlarged view of point A.

[0022] In the picture:

[0023] 1. Vacuum displacement tank; 2. Gas delivery mechanism; 201. Gas distribution port pipe; 202. Annular distribution main pipe; 203. Gas riser pipe; 204. Mounting flange plate; 205. Grating mesh; 3. Mounting lug; 4. Support frame; 5. Sealing cover; 6. Flange; 7. Vacuum extraction port; 8. Protective cover; 9. Vent pipe; 10. Valve; 11. Pressure sensor; 12. Feed pipe; 13. Feed valve; 14. Discharge pipe; 15. Discharge valve; 16. Gas delivery pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] According to an embodiment of the present invention, a vacuum displacement apparatus for catalyst production of tertiary amines is provided.

[0026] like Figures 1-4As shown, the vacuum replacement device for the catalyst in the production of tertiary amines according to an embodiment of this utility model includes a vacuum replacement tank 1. A gas supply mechanism 2 is provided at the bottom of the vacuum replacement tank 1 for uniformly introducing inert gases such as nitrogen and argon into the tank. The gas supply mechanism 2 includes a gas distribution port pipe 201 located at the bottom of the vacuum replacement tank 1. An annular distribution main pipe 202 is located below the gas distribution port pipe 201. Multiple riser pipes 203 are connected above the annular distribution main pipe 202. The riser pipes 203 pass upward through the gas distribution port pipe 201 and extend into the interior of the vacuum replacement tank 1. A mounting flange plate 204 is provided on the outer side of the riser pipes 203. The mounting flange 204 is bolted to the gas distribution port pipe 201. This structure not only facilitates the installation and subsequent maintenance of the riser pipe 203 assembly, but also allows for individual disassembly and replacement in case of blockage or damage. A grid mesh 205 is connected above the inlet pipe to prevent leakage into the gas distribution system without hindering uniform gas diffusion. The outer side of the annular distribution main pipe 202 is connected to the mounting lug 3, which is connected to the support frame 4. The support frame 4 is fixed to the outer wall of the vacuum replacement tank 1. The annular distribution main pipe 202 is connected to an external inert gas source (such as a nitrogen cylinder group or pipeline nitrogen system) through the gas delivery pipe 16. Accessories such as shut-off valves, filters, pressure reducing valves, and flow meters can be installed on the gas delivery pipe 16 to achieve precise control of the inlet pressure and flow rate, ensuring a smooth and controllable connection during the replacement process.

[0027] like Figures 1-4 As shown, a removable sealing cover 5 is installed at the top of the vacuum replacement tank 1 for internal maintenance and cleaning. A flange 6 is provided on both the sealing cover 5 and the vacuum replacement tank 1. Two sets of flanges 6 are sealed together by a set of high-strength bolts and equipped with a metal spiral wound gasket or graphite composite gasket to ensure the airtightness of the system under vacuum and positive pressure conditions. A vacuum extraction port 7 is connected to the top of the sealing cover 5 for connecting a vacuum pump or extraction system. During extraction, gas inside the tank is extracted through this port, creating a negative pressure environment to promote air removal. A protective cover 8 is connected to the outside of the vacuum extraction port 7, located inside the sealing cover 5. The protective cover 8 is connected to the sealing cover 5 via a connecting rod. The protective cover 8 is a stainless steel wire mesh structure with high ventilation rate and interception efficiency. A vent pipe 9 is connected to one side of the sealing cover 5, and a valve 10 is installed on the vent pipe 9 to control the timing and rate of gas discharge. A pressure sensor 11 is installed on one side of the vent pipe 9. The sealing cap 5 is threaded and used to monitor the pressure changes inside the tank in real time. The middle position of the sealing cap 5 is connected to the feed pipe 12 for the sealed feeding of the catalyst. The feed pipe 12 is equipped with a feed valve 13. The bottom end of the vacuum replacement tank 1 is connected to the discharge pipe 14, which is equipped with a discharge valve 15, preferably a ball valve or a gate valve, which has good sealing and flow performance and is easy to control the discharge speed. 3-4 support legs (ear seats) are evenly arranged on the outer wall of the tank. The lower end of the support leg is equipped with a base plate and is fixed to the ground or platform by bolts.

[0028] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0029] First, the catalyst to be treated is added to the vacuum replacement tank 1 through the feed pipe 12. Then, the vacuum pump or evacuation system is started, and the air inside the tank is extracted through the vacuum evacuation port 7 to create a negative pressure environment. This process helps reduce the oxygen content inside the tank, creating conditions for subsequent inert gas replacement. Simultaneously, the protective cover 8 prevents catalyst dust from entering the evacuation pipe, avoiding equipment contamination or affecting the efficiency of the vacuum pump. Once the predetermined vacuum level is reached inside the tank, the shut-off valve on the gas delivery pipe is opened, allowing nitrogen or argon from an external inert gas source (such as a nitrogen cylinder group or pipeline nitrogen system) to be evenly distributed throughout the tank via the gas delivery mechanism 2. Specifically, the inert gas first enters the annular distribution main pipe 202 and then is released upwards into the tank through the riser pipe 203. Because a grid 205 is installed above the riser pipe 203, it supports the catalyst bed without hindering the uniform diffusion of the gas, thus ensuring sufficient inert gas replacement between the catalyst particles. Throughout the replacement process, the pressure sensor 11 monitors the pressure changes inside the tank in real time and feeds the data back to the control system. If abnormal pressure (too high or too low) is detected, the timing and rate of gas discharge can be controlled by adjusting valve 10 on vent pipe 9 to ensure that the pressure inside the tank remains within a suitable range. Repeat this process several times until the oxygen content in the system drops below the safe limit. After inert gas replacement is complete, close all relevant valves and stop gas supply and extraction operations. Then, slowly open the ball valve or gate valve on discharge pipe 14 to discharge the treated catalyst from vacuum replacement tank 1 at the set speed. This not only effectively controls the unloading speed but also ensures that the quality of the catalyst is not affected.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum displacement apparatus for producing a tertiary amine catalyst, characterized in that, The system includes a vacuum replacement tank (1), and a gas delivery mechanism (2) is provided at the bottom of the vacuum replacement tank (1). The gas delivery mechanism (2) includes a gas distribution port pipe (201) located at the bottom of the vacuum replacement tank (1). A ring distribution main pipe (202) is provided below the gas distribution port pipe (201). Multiple riser pipes (203) are connected above the ring distribution main pipe (202). The riser pipes (203) pass upward through the gas distribution port pipe (201) and extend into the vacuum replacement tank (1). A mounting flange plate (204) is provided on the outside of the riser pipe (203). The mounting flange plate (204) is connected to the gas distribution port pipe (201) by bolts. A grid mesh (205) is connected above the air inlet pipe.

2. The vacuum displacement apparatus for producing a tertiary amine catalyst according to claim 1, characterized in that, The outer side of the annular distribution main pipe (202) is connected to the mounting ear (3), which is connected to the support frame (4). The support frame (4) is fixed to the outer wall of the vacuum replacement tank (1).

3. The vacuum displacement apparatus for producing a tertiary amine catalyst according to claim 1, characterized in that, The ring-shaped distribution main pipe (202) is connected to an external inert gas source through the gas supply pipe (16).

4. The vacuum displacement apparatus for producing a tertiary amine catalyst according to claim 1, characterized in that, The vacuum replacement tank (1) is equipped with a sealing cover (5) at the top, and the sealing cover (5) is connected to the outside of the vacuum replacement tank (1) by a flange (6).

5. The vacuum displacement apparatus for producing a tertiary amine catalyst according to claim 4, characterized in that, The top of the sealing cap (5) is connected to a vacuum extraction port (7).

6. The vacuum displacement apparatus for a catalyst in the production of tertiary amines according to claim 5, characterized in that, A protective cover (8) is connected to the outside of the vacuum extraction port (7). The protective cover (8) is located inside the sealing cover (5). The protective cover (8) is connected to the sealing cover (5) through a connecting rod. The protective cover (8) is a stainless steel wire mesh structure.

7. The vacuum displacement apparatus for producing a tertiary amine catalyst according to claim 6, characterized in that, A vent pipe (9) is connected to one side of the sealing cap (5). A valve (10) is provided on the vent pipe (9). A pressure sensor (11) is provided on one side of the vent pipe (9). The pressure sensor (11) is threadedly connected to the sealing cap (5).

8. The vacuum displacement apparatus for producing a tertiary amine catalyst according to claim 4, characterized in that, The sealing cap (5) is connected to the inlet pipe (12) in the middle position. The inlet pipe (12) is equipped with an inlet valve (13). The vacuum replacement tank (1) is connected to the outlet pipe (14) at the bottom end. The outlet pipe (14) is equipped with an outlet valve (15).

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