Fixed bed liquid phase hydrogenation device

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a fixed bed liquid phase hydrogenation device which comprises a workbench, the upper end of the workbench is fixedly connected with a reaction device, a hydrogenation assembly is arranged in the reaction device, and the hydrogenation assembly penetrates out of the right side wall surface of the reaction device. When the reactor is used, hydrogen introduced into the gas inlet pipeline is fully homogenized into the reaction inner cavity through the gas holes, so that under the condition that the activity of a catalyst is ensured, the catalyst is fully reacted with a reaction solvent, the mass transfer effect is improved, the amplification effect in the production process is avoided, and the reaction efficiency is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a fixed bed liquid phase hydrogenation device. Background Art

[0002] Fixed bed reactors are widely used in catalytic reactions of traditional basic chemical industry, mainly involving gas-solid phase reactions (generally the solid phase is a catalyst), and a small number of gas-liquid-solid three-phase reactions (the liquid is generally a raw material liquid, and the solid is a catalyst, which is also called a trickle bed reactor). A simple three-way is used to introduce gas and liquid into the reactor bed, which makes it difficult to achieve efficient gas / liquid mixing and distribution to the catalyst bed, thereby reducing the reaction efficiency and causing incomplete reaction. Therefore, those skilled in the art provide a fixed bed liquid phase hydrogenation device to solve the problems raised in the above background technology. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a fixed bed liquid phase hydrogenation device, comprising a workbench, the upper end of which is fixedly connected to a reaction device, a hydrogenation component is arranged inside the reaction device, and the hydrogenation component passes through the right wall of the reaction device;

[0004] The reaction device comprises a reactor, a tray, a mixing piece, a hollow hole, a conical piece, a reaction cavity, a through hole, a ring cavity, a guide cavity and a feeding channel. A mixing piece is fixedly installed in the middle of the reactor, a conical piece is arranged in the mixing piece, a reaction cavity is arranged in the gap between the conical piece and the mixing piece, a plurality of hollow holes are equidistantly arranged in an annular shape on the cavity top of the reaction cavity and the tray, a solid catalyst for the reaction is placed in the reaction cavity through the hollow holes, a feeding channel is arranged in the middle of the conical piece, a plurality of guide cavities are arranged in an annular shape in the upper part of the mixing piece, and the guide cavities and the hollow holes are arranged alternately;

[0005] The hydrogenation component includes an air intake pipe, an annular pipe, a shunt air pipe, a branch pipe and air holes. A plurality of shunt air pipes are connected between the inner port of the air intake pipe and the annular pipe. A plurality of branch pipes are connected under the shunt air pipe. The branch pipes are directly inserted into the reaction cavity and buried in the solid catalyst. The branch pipes are staggered with the shunt air pipes, and a plurality of air holes are opened on the side end wall of the branch pipe.

[0006] Preferably: the top of the reaction device is fixedly connected to a liquid inlet pipe, the lower side end of the liquid inlet pipe is externally connected to a transmitter, the transmitter is connected to an exhaust pipe, the transmitter is used to ensure the internal pressure of the reaction device to avoid direct emptying resulting in insufficient internal pressure, the exhaust pipe is used to discharge the chemical gases generated during the reaction process, and a start-stop pump is provided on the liquid inlet pipe, which is used to seal the liquid inlet of the reaction device to reduce the influence of the external environment on the reaction.

[0007] Preferably, a feed pipe is provided on the right side of the lower end of the reaction device, and the reaction completed material is collected by the feed pipe.

[0008] Preferably, a tray is fixedly installed in the upper part of the reactor, the annular tube is placed on the tray, and the hydrogenation assembly is supported by the tray, thereby ensuring that the hydrogenation assembly can hydrogenate normally.

[0009] Preferably, a circulation pipe is connected to the bottom of the reaction device, the end of the circulation pipe is connected to a circulation pump, the circulation pump is fixedly placed on a workbench, the upper end of the circulation pump is connected to a reflux pipe, and the reflux pipe is connected to the middle side end of the reaction device.

[0010] Preferably: an annular cavity is formed between the outer wall of the mixing element and the inner wall of the reactor, a plurality of through holes are opened on the side wall of the mixing element, the inner cavity of the reaction is connected with the annular cavity by means of the through holes, and the guide cavity is connected with the discharge channel and the annular cavity, so that the reaction solution overflows out of the discharge channel.

[0011] Technical effects and advantages of the utility model:

[0012] 1. When the utility model is used, the reaction overflow solution is re-injected into the reactor through the circulation pipe and the reflux pipe by starting the circulation pump, and enters the reaction cavity for further circulation reaction, thereby increasing the reaction completion degree until all the solution reacts, ensuring a thorough reaction, reducing incomplete reactions, gas escape, and thus reducing costs.

[0013] 2. When the utility model is used, the hydrogen connected to the air inlet pipe is fully homogenized into the reaction cavity through the air hole, thereby ensuring that it fully reacts with the reaction solvent under the activity of the catalyst, improving the mass transfer effect, avoiding the amplification effect in the production process, and ensuring the reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure provided by this application;

[0015] Figure 2 is a cross-sectional view of a reaction device provided by the present application;

[0016] Figure 3 It is a structural schematic diagram of the reaction device provided in this application;

[0017] Figure 4 It is a schematic diagram of the structure of the hydrogenation assembly provided in this application;

[0018] In the figure: 1. workbench; 2. reaction device; 3. circulation pipe; 4. circulation pump; 5. reflux pipe; 6. liquid inlet pipe; 7. start-stop pump; 8. discharge pipe; 9. hydrogenation assembly;

[0019] 21. Reactor; 22. Tray; 23. Mixing element; 24. Hollow hole; 25. Conical element; 26. Reaction cavity; 27. Through hole; 28. Ring cavity; 29. ​​Guide cavity; 210. Feeding channel;

[0020] 91. Inlet pipe; 92. Annular pipe; 93. Diversion pipe; 94. Branch pipe; 95. Air hole. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific purposes.

[0022] See also Figures 1-2 In this embodiment, a fixed bed liquid phase hydrogenation device is provided, including a workbench 1, wherein the upper end of the workbench 1 is fixedly connected to a reaction device 2, a circulation pipe 3 is connected to the bottom of the reaction device 2, the end of the circulation pipe 3 is connected to a circulation pump 4, the circulation pump 4 is fixedly arranged on the workbench 1, the upper end of the circulation pump 4 is connected to a reflux pipe 5, the reflux pipe 5 is connected to the middle side end of the reaction device 2, the top of the reaction device 2 is fixedly connected to a liquid inlet pipe 6, the lower side end of the liquid inlet pipe 6 is externally connected to a transmitter, the transmitter is connected to an exhaust pipe, the transmitter is used to ensure the internal pressure of the reaction device 2, avoid direct emptying resulting in insufficient internal pressure, and use the exhaust pipe to discharge the compound gas appearing in the reaction process, a start-stop pump 7 is provided on the liquid inlet pipe 6, the start-stop pump 7 is used to seal the liquid inlet of the reaction device 2, and the influence of the external environment on the reaction is reduced, a discharge pipe 8 is opened on the right side of the lower end of the reaction device 2, and the discharge pipe 8 is used to collect the reaction completed material, a hydrogenation component 9 is provided inside the reaction device 2, and the hydrogenation component 9 passes through the right side wall of the reaction device 2.

[0023] like Figure 3As shown, the reaction device 2 includes a reactor 21, a tray 22, a mixing piece 23, a hollow hole 24, a conical piece 25, a reaction cavity 26, a through hole 27, an annular cavity 28, a guide cavity 29 and a feed channel 210. The tray 22 is fixedly installed on the upper part of the reactor 21, and the hydrogenation assembly 9 is supported by the tray 22 to ensure that the hydrogenation assembly 9 can be hydrogenated normally. A mixing piece 23 is fixedly installed in the middle part of the reactor 21, and a conical piece 25 is arranged in the mixing piece 23. The gap between the conical piece 25 and the mixing piece 23 is set as a reaction cavity 26, and the cavity top of the reaction cavity 26 is equidistant from the annular portion on the tray 22. A plurality of hollow holes 24 are provided, through which the solid catalyst for the reaction is placed in the reaction cavity 26. An annular cavity 28 is formed between the outer wall of the mixing element 23 and the inner wall of the reactor 21. A plurality of through holes 27 are provided on the side wall of the mixing element 23, through which the reaction cavity 26 is connected with the annular cavity 28. A discharge channel 210 is provided in the middle of the conical element 25. A plurality of guide cavities 29 are provided in an annular shape in the upper inner part of the mixing element 23. The guide cavities 29 are staggered with the hollow holes 24, and the guide cavities 29 are connected with the discharge channel 210 and the annular cavity 28, so that the reaction solution overflows out of the discharge channel 210.

[0024] like Figure 4 As shown, the hydrogenation assembly 9 includes an air intake pipe 91, an annular pipe 92, a diverter pipe 93, a branch pipe 94 and an air hole 95. The annular pipe 92 is placed on the tray 22. A plurality of diverter pipes 93 are connected between the inner port of the air intake pipe 91 and the annular pipe 92. A plurality of branch pipes 94 are connected to the diverter pipes 93. The branch pipes 94 are staggered with the diverter pipes 93. The branch pipes 94 are directly inserted into the reaction cavity 26 and buried in the solid catalyst. A plurality of air holes 95 are opened on the side end wall of the branch pipe 94. The hydrogen connected to the air intake pipe 91 is fully homogenized into the reaction cavity 26 through the air holes 95, thereby ensuring that the hydrogen fully reacts with the reaction solvent under the activity of the catalyst.

[0025] The working principle of the utility model is:

[0026] When the utility model is used, the start-stop pump 7 is turned on, and the reaction solvent is pre-injected into the reactor 21 through the liquid inlet pipe 6 until the solid catalyst in the reaction cavity 26 is immersed, and then the start-stop pump 7 is closed, and then hydrogenation is carried out through the air inlet pipe 91, and the air is passed into the annular pipe 92 through the branch air pipe 93, and is homogenized by the air holes 95 on the branch pipe 94 and passed near the catalyst, and then fully reacts with the reaction solvent to increase the reaction rate and reduce the short-term saturation phenomenon caused by direct hydrogenation during the reaction process, which makes the reaction incomplete. The reacted solvent will overflow from the discharge channel 210 through the through hole 27 through the annular cavity 28 and the guide cavity 29 and fall to the bottom of the reactor 21, and then the circulation pump 4 is started to re-inject the reaction overflow solution into the reactor 21 through the circulation pipe 3 and the reflux pipe 5, and enter the reaction cavity 26 for further circulation reaction, thereby increasing the reaction completion degree until all the solution reactions are completed.

[0027] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A fixed bed liquid phase hydrogenation device, comprising a workbench (1), characterized in that: The upper end of the workbench (1) is fixedly connected to the reaction device (2), a hydrogenation assembly (9) is arranged inside the reaction device (2), and the hydrogenation assembly (9) passes through the right side wall of the reaction device (2); The reaction device (2) comprises a reactor (21), a tray (22), a mixing element (23), a hollow hole (24), a conical element (25), a reaction cavity (26), a through hole (27), an annular cavity (28), a guide cavity (29) and a feed channel (210). The mixing element (23) is fixedly installed in the middle of the reactor (21), the conical element (25) is arranged in the mixing element (23), and the conical element (25) and the mixing element (23) are connected to each other. ) The gap is set as a reaction cavity (26), a plurality of hollow holes (24) are equidistantly provided in an annular manner on the cavity top of the reaction cavity (26) and the tray (22), and a solid catalyst for reaction is placed into the reaction cavity (26) through the hollow holes (24), a material discharge channel (210) is provided in the middle of the conical member (25), and a plurality of guide cavities (29) are provided in an annular manner on the upper inner part of the mixing member (23), and the guide cavities (29) and the hollow holes (24) are arranged alternately; The hydrogenation assembly (9) comprises an air intake pipe (91), an annular pipe (92), a branch air pipe (93), a branch pipe (94) and an air hole (95). A plurality of branch air pipes (93) are connected between the inner port of the air intake pipe (91) and the annular pipe (92). A plurality of branch air pipes (94) are connected below the branch air pipe (93). The branch air pipe (94) is directly inserted into the reaction cavity (26) and buried in the solid catalyst. The branch air pipe (94) is staggered with the branch air pipe (93). A plurality of air holes (95) are provided on the side end wall of the branch air pipe (94).

2. A fixed bed liquid phase hydrogenation device according to claim 1, characterized in that: The top of the reaction device (2) is fixedly connected to a liquid inlet pipe (6), the lower side end of the liquid inlet pipe (6) is externally connected to a transmitter, the transmitter is connected to an exhaust pipe, and a start-stop pump (7) is provided on the liquid inlet pipe (6), and the liquid inlet of the reaction device (2) is sealed by the start-stop pump (7).

3. A fixed bed liquid phase hydrogenation device according to claim 1, characterized in that: A feeding pipe (8) is provided on the right side of the lower end of the reaction device (2).

4. A fixed bed liquid phase hydrogenation device according to claim 1, characterized in that: A tray (22) is fixedly installed in the upper part of the reactor (21), and the annular tube (92) is placed on the tray (22).

5. A fixed bed liquid phase hydrogenation device according to claim 1, characterized in that: The bottom of the reaction device (2) is connected to a circulation pipe (3), the end of the circulation pipe (3) is connected to a circulation pump (4), the circulation pump (4) is fixedly placed on the workbench (1), the upper end of the circulation pump (4) is connected to a reflux pipe (5), and the reflux pipe (5) is connected to the middle side end of the reaction device (2).

6. A fixed bed liquid phase hydrogenation device according to claim 1, characterized in that: An annular cavity (28) is formed between the outer wall of the mixing element (23) and the inner wall of the reactor (21). A plurality of through holes (27) are provided on the side wall of the mixing element (23). The reaction inner cavity (26) is connected to the annular cavity (28) via the through holes (27). The guide cavity (29) is connected to the discharge channel (210) and the annular cavity (28), so that the reaction solution overflows out of the discharge channel (210).

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