Hydrogenation reaction device

Abstract

The hydrogenation reaction device comprises an inner pipe, an outer pipe, a connecting plate, a supporting block and a constant temperature unit, the outer pipe is arranged on the outer side of the inner pipe in a sleeving mode, and the two ends of the outer pipe and the two ends of the inner pipe correspond to each other and are provided with two end faces located on the same plane; the connecting plates are arranged between the end faces of the two adjacent inner pipes and between the end faces of the two adjacent outer pipes and connected with the inner pipes and the outer pipes correspondingly. The multiple supporting blocks are arranged between the outer pipe and the inner pipe, and the supporting blocks abut against the inner side of the outer pipe and the outer side of the inner pipe so as to support the outer pipe and the inner pipe. The two adjacent inner pipes are connected to the different sides of the same connecting plate, so that the multiple sections of inner pipes are connected, the two adjacent outer pipes are connected to the different sides of the same connecting plate, the multiple sections of outer pipes are connected, the same side of the same connecting plate is connected with the outer pipes and the inner pipes which are arranged together in a sleeved mode, and the inner pipes and the outer pipes are connected more firmly; and a supporting block is mounted between the outer pipe and the inner pipe, so that the stability of connection between the outer pipe and the inner pipe is further improved, and the displacement of the pipeline is reduced.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, specifically to a hydrogenation reaction apparatus. Background Technology

[0002] Hydrogenation reactors are a very important piece of equipment in organic chemistry laboratories and actual production processes. They can be used not only as containers for hydrogenation reactions, but also in situations where liquids and gases need to be thoroughly mixed.

[0003] Tubular reactors consist of empty or packed tubes with a large length-to-diameter ratio and can be used to achieve gas-phase and liquid-phase reactions, commonly used in the production of methyl propionate. However, the vigorous reactions during production in existing tubular reactors can cause pipe vibration, which over time can affect the tightness of connections between pipe components and also negatively impact the operation of some delicate instrument elements. Utility Model Content

[0004] The purpose of this application is to overcome the above-mentioned technical deficiencies and provide a hydrogenation reaction apparatus to solve the problem of pipeline cross-flow during the reaction in the tubular reactor in the prior art.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this application is as follows: A hydrogenation reaction apparatus includes an inner tube, an outer tube, a connecting plate, support blocks, and a constant temperature unit, wherein: the inner tube is used to introduce reaction liquid and hydrogen gas, and the inner tube contains a catalyst; the outer tube is sleeved on the outside of the inner tube, and the two ends of the outer tube correspond to the two ends of the inner tube and have two end faces on the same plane, and multiple segments of the outer tube are connected in sequence, and multiple segments of the inner tube are connected in sequence; the connecting plate is disposed between the end faces of two adjacent inner tubes and the end faces of two adjacent outer tubes, and is connected to the inner tube and the outer tube respectively; multiple support blocks are disposed between the outer tube and the inner tube, and the support blocks abut against the inner side of the outer tube and the outer side of the inner tube to support the outer tube and the inner tube; the constant temperature unit is disposed between the outer tube and the inner tube, and the constant temperature unit is used to heat the inner tube to maintain a constant temperature inside the inner tube.

[0006] Preferably, the inner tube extends outward at both ends to form two first flange portions, which are fixedly connected to the connecting plate.

[0007] Preferably, the hydrogenation reaction apparatus further includes a first sealing ring, which is disposed between the first flange and the connecting plate.

[0008] Preferably, the connecting plate extends to form abutment portions on both sides, and the inner side of the inner tube is recessed inward to form an abutment groove, with the abutment portions abutting against the abutment groove.

[0009] Preferably, the side of the abutment portion has a slope.

[0010] Preferably, the hydrogenation reaction apparatus further includes a second sealing ring, which is disposed between the abutting portion and the abutting groove.

[0011] Preferably, the two ends of the outer tube extend outward to form two second flange portions, which are fixedly connected to the connecting plate.

[0012] Preferably, the hydrogenation reaction apparatus further includes a third sealing ring, which is disposed between the second flange and the connecting plate.

[0013] Preferably, the support block includes two interconnected support semi-rings. Each support semi-ring includes a connecting semi-ring portion and a plurality of support portions. The connecting semi-ring portion is semi-circular. The support portions are radially formed along the connecting semi-ring portion. The plurality of support portions are arranged circumferentially along the connecting semi-ring portion and fixedly connected to the connecting semi-ring portion. The connecting semi-ring portion is sleeved on the outside of the inner tube, and the plurality of support portions abut against the inside of the outer tube.

[0014] Preferably, the supporting half-ring further includes a mating part, which is disposed at both ends of the connecting half-ring and, in the same supporting block, the two mating parts located on the two supporting half-rings are interference-fitted.

[0015] Compared with the prior art, the beneficial effects of this application include: two adjacent inner pipes are connected to different sides of the same connecting plate, thereby connecting multiple sections of inner pipe; two adjacent outer pipes are connected to different sides of the same connecting plate, thereby connecting multiple sections of outer pipe; the outer pipe and inner pipe are connected and sleeved together on the same side of the same connecting plate, making the connection between the inner pipe and the outer pipe more secure; and a support block is installed between the outer pipe and the inner pipe, further improving the stability of the connection between the outer pipe and the inner pipe and reducing pipe movement. Attached Figure Description

[0016] Figure 1 This is a perspective view of the hydrogenation reaction apparatus provided in this application;

[0017] Figure 2 This is a perspective view of the inner tube and support block of the hydrogenation reactor provided in this application;

[0018] Figure 3 This is a cross-sectional view of the connection between the connecting plate of the hydrogenation reactor and the outer and inner pipes provided in this application;

[0019] Figure 4 This is a perspective view of the support block of the hydrogenation reactor provided in this application;

[0020] Reference numerals: 1-Inner tube, 2-Outer tube, 3-Connecting plate, 4-Support block, 5-First sealing ring, 6-Second sealing ring, 7-Third sealing ring, 1a-First flange part, 1b-Abutting groove, 2a-Second flange part, 3a-Abutting part, 3b-Connecting hole, 4a-Supporting half ring, 4aa-Connecting half ring part, 4ab-Supporting part, 4ac-Matching part. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] Please see Figures 1 to 4 This embodiment provides a hydrogenation reaction apparatus, including an inner tube 1, an outer tube 2, a connecting plate 3, and a support block 4. The inner tube 1 serves as the reaction container, the outer tube 2 is used for the flow of heat transfer medium between the inner tube 1 and the outer tube 2, the connecting plate 3 is used to connect the inner tube 1 and the outer tube 2, and the support block 4 is used to support the inner tube 1 and the outer tube 2.

[0023] The inner tube 1 is used to introduce the reaction liquid and hydrogen gas, and contains a catalyst. The outer tube 2 is sleeved on the outside of the inner tube 1, with its two ends corresponding to the two ends of the inner tube 1 and having two end faces on the same plane. Multiple sections of the outer tube 2 are connected sequentially, as are multiple sections of the inner tube 1. A connecting plate 3 is disposed between the end faces of two adjacent inner tubes 1 and two adjacent outer tubes 2, and is connected to both the inner tube 1 and the outer tube 2 respectively. That is, each connecting plate 3 connects one outer tube 2 and one inner tube 1 on each side, so that an outer tube 2 and an inner tube 1 sleeved together are connected to the same side of the same connecting plate 3, two adjacent inner tubes 1 are connected to different sides of the same connecting plate 3, and two adjacent outer tubes 2 are connected to different sides of the same connecting plate 3. Specifically, the two ends of the inner tube 1 extend outwards to form two first flange portions 1a, which are fixedly connected to the connecting plate 3. The first flange portions 1a and the connecting plate 3 can be fixedly connected by welding, riveting, bolting, etc. In this embodiment, bolting is preferred. Furthermore, the outer tube 2 extends outward at both ends to form a second flange portion 2a, which is fixedly connected to the connecting plate 3. The second flange portion 2a and the connecting plate 3 can be fixedly connected by welding, riveting, bolting or other connection methods. In this embodiment, the two are preferably connected by bolts.

[0024] The thermostatic unit is located between the outer tube 2 and the inner tube 1. The thermostatic unit is used to heat the inner tube to maintain a constant temperature inside the inner tube. The thermostatic unit can generally use heating wires or the like to heat the heat transfer medium in the outer tube. The heat transfer medium can be water or heat transfer oil.

[0025] The following is a brief description of the chemical reaction process in this application: The tubular reactor in this application is used to hydrogenate the material after the aldol condensation reaction of methyl acetate and formaldehyde, and to hydrogenate the methyl acrylate produced by the reaction to methyl propionate, and to convert the unreacted formaldehyde to methanol. This facilitates the subsequent purification and separation of the methyl propionate product. (1) Characteristics of the hydrogenation reaction: Two-stage hydrogenation, with one reactor containing two different hydrogenation catalysts, or two reactors connected in series, each containing a different catalyst. A Ni-based catalyst is used to hydrogenate methyl acrylate to methyl propionate, and a copper-based catalyst is used to hydrogenate formaldehyde to methanol. (2) Reaction process: The hydrogenation feed is mixed with hydrogen at 100-200℃ and 0.1-2.0MPa and enters the hydrogenation reactor. The hydrogenation process of acrylic acid is a slightly exothermic reaction, and the hydrogenation process of formaldehyde is also a slightly exothermic reaction. According to the concentration of the feed and the magnitude of the heat of reaction, the reactor is set as a shell-and-tube isothermal reactor. The formaldehyde content at the reactor outlet was reduced to 0.01%, and the methyl acrylate content was reduced to below 0.1%.

[0026] Preferably, the hydrogenation reactor further includes a first sealing ring 5, which is disposed between the first flange 1a and the connecting plate 3. During the bolt connection between the first flange 1a and the connecting plate 3, the first sealing ring 5 is deformed by the pressure of the first flange 1a and the connecting plate 3, filling the gap between the first flange 1a and the connecting plate 3, thereby improving the sealing performance of the inner tube 1 and the connecting plate 3.

[0027] Preferably, the hydrogenation reactor further includes a third sealing ring 7, which is disposed between the second flange 2a and the connecting plate 3. During the bolted connection between the second flange 2a and the connecting plate 3, the third sealing ring 7 is deformed by the pressure of the second flange 2a and the connecting plate 3, filling the gap between the second flange 2a and the connecting plate 3, thereby improving the sealing performance between the outer pipe 2 and the connecting plate 3.

[0028] Preferably, the connecting plate 3 extends to form abutment portions 3a on both sides, and the inner side of the inner tube 1 is recessed inward to form an abutment groove 1b. The abutment portions 3a abut against the abutment groove 1b, and the inner side of the abutment portion 3a and the inner side of the inner tube 1 are on the same cylindrical surface, making the transition between the inner side of the inner tube 1 and the abutment portion 3a smooth and reducing the obstruction of reactants in the inner tube 1. More preferably, the side of the abutment portion 3a has a slope to facilitate the assembly of the abutment portion 3a and the abutment groove 1b. More preferably, the hydrogenation reaction device also includes a second sealing ring 6, which is disposed between the abutment portion 3a and the abutment groove 1b. When the abutment portion 3a and the abutment groove 1b are connected, the second sealing ring 6 is deformed by the pressure of the abutment portion 3a and the abutment groove 1b, filling the gap between the abutment portion 3a and the abutment groove 1b, thereby improving the sealing performance between the inner tube 1 and the connecting plate 3.

[0029] Preferably, the connecting plate 3 is also provided with a connecting hole 3b to connect adjacent outer tubes 2, which facilitates the flow of heat transfer medium.

[0030] Multiple support blocks 4 are disposed between the outer tube 2 and the inner tube 1, and the support blocks 4 abut against the inner side of the outer tube 2 and the outer side of the inner tube 1 to support the outer tube 2 and the inner tube 1. Specifically, the support block 4 includes two interconnected support semi-rings 4a. The support semi-rings 4a include a connecting semi-ring portion 4aa and multiple support portions 4ab. The connecting semi-ring portion 4aa is semi-circular, and the support portions 4ab are radially formed along the connecting semi-ring portion 4aa. The multiple support portions 4ab are arranged circumferentially along the connecting semi-ring portion 4aa and are fixedly connected to the connecting semi-ring portion 4aa. The connecting semi-ring portion 4aa is sleeved on the outer side of the inner tube 1, and the multiple support portions 4ab abut against the inner side of the outer tube 2. Preferably, the supporting half-ring 4a further includes a mating part, which is disposed at both ends of the connecting half-ring part 4aa and in the same supporting block 4: the two mating parts located on the two supporting half-rings 4a are interference-fitted. In this embodiment, one of the mating parts is a groove and the other is a boss, so that the two supporting half-rings 4a can be connected radially along the inner tube 1, thereby fitting the supporting half-ring 4a onto the inner tube 1.

[0031] The following is a brief description of the usage process of the hydrogenation reactor provided in this application: During installation, the inner tube 1 must be installed first, followed by the outer tube 2. First, install the support blocks 4, and then fit the two support half-rings 4a onto the outside of the inner tube 1. Then, connect the mating parts of the two support half-rings 4a radially. At this time, the two support half-rings 4a are connected together. Install multiple support blocks 4 in this way. Then, move the outer tube 2 axially along the inner tube 1, and make the support parts 4ab of all the support blocks 4 abut against the inner side of the outer tube 2. Further move the outer tube 2 so that both ends of the outer tube 2 and both ends of the inner tube 1 are on the same plane. Then, place the two sets of first sealing rings 5, second sealing rings 6, and third sealing rings 7 on both sides of the connecting plate 3, and move the connecting plate 3 so that one side of the connecting plate 3 abuts against the outer pipe 2 and the inner pipe 1. Then, the other section of the inner pipe 1 abuts against the other side of the connecting plate 3. Then, fix the two inner pipes 1 and the connecting plate 3 between the two inner pipes 1 with bolts. Then, install the support block 4 on the inner pipe 1 and fit it into the outer pipe 2. Move the outer pipe 2 so that the second flange part 2a abuts against the connecting plate 3. Then, fix the two outer pipes 2 and the connecting plate 3 between the two outer pipes 2 with bolts, thereby realizing the connection of the two sets of outer pipes 2 and inner pipes 1.

[0032] In summary, the hydrogenation reactor provided in this application connects two adjacent inner tubes 1 to different sides of the same connecting plate 3, thereby connecting multiple sections of inner tube 1. Similarly, two adjacent outer tubes 2 are connected to different sides of the same connecting plate 3, thereby connecting multiple sections of outer tube 2. The outer tubes 2 and inner tubes 1 are connected and sleeved together on the same side of the same connecting plate 3, making the connection between the inner tubes 1 and outer tubes 2 more secure. A support block 4 is installed between the outer tubes 2 and inner tubes 1, further enhancing the stability of the connection between the outer tubes 2 and inner tubes 1 and reducing pipe movement.

[0033] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A hydrogenation reaction apparatus characterized by comprising: The hydrogenation reaction device comprises an inner tube, an outer tube, a connecting plate, a support block and a constant temperature unit, wherein: The inner tube is used for passing in reaction liquid and hydrogen, and the inner tube is provided with a catalyst; The outer tube is sleeved outside the inner tube, and the outer tube is provided with two end faces in the same plane at two ends respectively corresponding to the two ends of the inner tube, a plurality of the outer tubes are connected in sequence, and a plurality of the inner tubes are connected in sequence; The connecting plate is arranged between the end faces of the adjacent two inner tubes and the end faces of the adjacent two outer tubes, and is connected with the inner tube and the outer tube respectively; A plurality of the support blocks are arranged between the outer tube and the inner tube, and the support blocks abut against the inner side of the outer tube and the outer side of the inner tube to support the outer tube and the inner tube; The constant temperature unit is arranged between the outer tube and the inner tube, and the constant temperature unit is used for heating the inner tube to keep the inner tube constant in temperature.

2. The hydrogenation reactor of claim 1, wherein The two ends of the inner tube respectively extend outward and form two first flange portions, and the first flange portions are fixedly connected with the connecting plate.

3. The hydrogenation reactor of claim 2, wherein The hydrogenation reaction device further comprises a first sealing ring arranged between the first flange portion and the connecting plate.

4. The hydrogenation reactor of claim 1, wherein The connecting plate extends on both sides to form abutting portions, and the inner side of the inner tube is recessed inward to form abutting grooves, and the abutting portions abut against the abutting grooves.

5. The hydrogenation reactor of claim 4, wherein The side surface of the abutting portion has a slope.

6. The hydrogenation reactor of claim 4, wherein The hydrogenation reaction device further comprises a second sealing ring arranged between the abutting portion and the abutting groove.

7. The hydrogenation reactor of claim 1, wherein The two ends of the outer tube respectively extend outward and form two second flange portions, and the second flange portions are fixedly connected with the connecting plate.

8. The hydrogenation reactor of claim 7, wherein The hydrogenation reaction device further comprises a third sealing ring arranged between the second flange portion and the connecting plate.

9. The hydrogenation reactor of claim 1, wherein, The support block comprises two support half-rings connected with each other, the support half-ring comprises a connecting half-ring portion and a plurality of support portions, the connecting half-ring portion is in the shape of a half ring, the support portions are formed radially along the connecting half-ring portion, a plurality of the support portions are arranged circumferentially along the connecting half-ring portion and fixedly connected with the connecting half-ring portion, the connecting half-ring portion is sleeved outside the inner tube, and a plurality of the support portions abut against the inner side of the outer tube.

10. The hydrogenation reactor of claim 9, wherein The support half-ring further comprises a matching portion arranged at two ends of the connecting half-ring portion, and in the same support block: the two matching portions located on the two support half-rings are in interference fit.

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