Catalytic hydrogenation equipment

Abstract

The utility model relates to the technical field of chemical equipment, and provides catalytic hydrogenation equipment, in a hydrogenation reaction process, hydrogen enters a gas inlet pipe through a gas inlet end of a reaction box, then is introduced into an injection cavity through the gas inlet pipe, and then enters a mixing cavity through dispersion holes of a dispersion plate. At the moment, the hydrogen is uniformly dispersed in the mixing cavity under the action of the dispersion plate, so that the hydrogen can be uniformly mixed with materials entering from the feeding pipe in the mixing cavity. The mixed gas-liquid mixture is uniformly input into a heater through an output pipe to be preheated, so that the temperature required by the reaction is reached; after heating, the gas-liquid mixture is conveyed into the reaction tube from the outflow end for reaction; after the reaction, the gas is conveyed into a gas-liquid separator for gas-liquid separation, separated gas is conveyed to a gas outlet end from a gas end, and liquid is conveyed to a liquid discharge end from a liquid end. Thus, the mixer is ingeniously designed, mixing between gas and liquid phases is enhanced, the hydrogenation reaction rate is increased, and the reaction effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to catalytic hydrogenation equipment. Background Art

[0002] Catalytic hydrogenation equipment is a widely used equipment in the chemical industry. It can not only be used as a container for hydrogenation reaction, but also can be used in situations where liquid and gas need to be fully mixed. In the existing literature (application number 202320034336.4), a continuous hydrogenation reaction equipment is disclosed, including a reactor body, the reactor body is equipped with a feed pipe, and the left side of the reactor body is provided with an air inlet pipe. During the reaction process, the material enters the interior of the reactor body from the feed pipe, and the hydrogen enters the interior of the reactor body from the air inlet pipe to perform a hydrogenation reaction.

[0003] However, this hydrogenation reaction equipment adds hydrogen and materials separately into the reactor body, and only relies on the residence time inside the reactor body to complete the mixing and reaction between different phases, resulting in some materials and hydrogen not having enough time to contact and being discharged from the reactor body, resulting in a low hydrogenation reaction rate and poor reaction effect. Utility Model Content

[0004] Based on the above background, the purpose of the utility model is to provide a catalytic hydrogenation equipment to strengthen the mixing between materials and hydrogen, increase the hydrogenation reaction rate, and thus improve the reaction effect.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A catalytic hydrogenation device comprises: a reaction box having an air inlet end, an air outlet end and a liquid discharge end; a mixer, arranged in the reaction box, and comprising a mixing body, a dispersion plate, an air inlet pipe, a feed pipe and an output pipe, the dispersion plate being arranged in the mixing body and dividing the mixing body into an injection chamber and a mixing chamber, the dispersion plate having a plurality of dispersion holes, the air inlet pipe being communicated with the injection chamber, the feed pipe and the output pipe being communicated with the mixing chamber, and the air inlet pipe being communicated with the air inlet end; a heater, arranged in the reaction box, and having an air inlet end and an outflow end, the air inlet end being communicated with the output pipe; a reaction tube, arranged in the reaction box, and one end of which is communicated with the outflow end, the reaction tube containing a catalyst; a gas-liquid separator, arranged in the reaction box, and communicated with the other end of the reaction tube, for separating gas and liquid, and having a gas end and a liquid end, the gas end being communicated with the air outlet end, and the liquid end being communicated with the liquid discharge end.

[0007] Furthermore, the cross-sectional area of ​​the injection chamber gradually increases from one end of the injection chamber close to the air inlet pipe to one end of the injection chamber close to the dispersion plate.

[0008] Further, the mixing chamber includes a first split chamber and a second split chamber that are connected, the second split chamber is located on a side of the first split chamber away from the dispersion plate, the feed pipe is connected to the first split chamber, and the output pipe is connected to the second split chamber.

[0009] Furthermore, the cross-sectional area of ​​the second split cavity gradually decreases from one end of the second split cavity close to the first split cavity to one end of the second split cavity close to the output tube.

[0010] Furthermore, the heater includes a heating shell and a heat exchange tube arranged in the heating shell, a heat exchange channel for heat exchange medium to flow is formed between the heat exchange tube and the heating shell, one end of the heat exchange tube is connected to the inlet end, and the other end of the heat exchange tube is connected to the outlet end.

[0011] Furthermore, the heating shell is sleeved outside the reaction tube, and the heat exchange tube is spirally coiled around the outer circumference of the reaction tube, and the heat exchange channel is formed between the heating shell, the heat exchange tube and the outer circumference of the reaction tube.

[0012] Furthermore, the heating shell includes a barrel portion and end covers respectively arranged at both ends of the barrel portion, the barrel portion is sleeved on the outer circumference of the reaction tube at intervals, the end cover portion is sleeved on the reaction tube and is detachably connected to the barrel portion.

[0013] Furthermore, it also includes an input pipe and a discharge pipe, the heating shell is provided with an inlet and a discharge port both connected to the heat exchange channel, the input pipe is connected to the top of the reaction tube, the discharge pipe is connected to the bottom of the reaction tube, the input pipe is connected to the outflow end, the inlet is located at the bottom of the heating shell, and the discharge port is located at the top of the heating shell.

[0014] The utility model has the following beneficial effects:

[0015] (1) During the hydrogenation reaction, hydrogen enters the air inlet pipe through the air inlet end of the reaction box, then enters the injection chamber through the air inlet pipe, and then enters the mixing chamber through the dispersion holes of the dispersion plate. At this time, the hydrogen is evenly dispersed in the mixing chamber under the action of the dispersion plate, so as to ensure that the hydrogen can be evenly mixed with the material entering from the feed pipe in the mixing chamber. The mixed gas-liquid mixture is uniformly input into the heater through the output pipe for preheating to reach the required temperature for the reaction; after heating, the gas-liquid mixture is transported from the outflow end to the reaction tube for reaction; after the reaction, it is transported to the gas-liquid separator for gas-liquid separation, and the separated gas is transported from the gas end to the gas outlet end, and the liquid is transported from the liquid end to the liquid discharge end. In this way, the mixer is cleverly designed to strengthen the mixing between the gas and liquid phases, increase the hydrogenation reaction rate, and thus improve the reaction effect.

[0016] (2) The cross-sectional area of ​​the injection chamber is gradually increased from the end close to the intake pipe to the end close to the dispersion plate, so that the flow rate of the hydrogen output from the intake pipe is gradually slowed down, which is convenient for the input hydrogen to diffuse around and avoid the hydrogen directly and quickly impacting the middle of the dispersion plate. This can not only avoid the concentrated force on the dispersion plate, but also facilitate the diffusion of hydrogen around and flow into the mixing chamber from different dispersion holes, which is beneficial to improve the dispersion of hydrogen.

[0017] (3) The cross-sectional area of ​​the second sub-cavity of the mixing chamber is gradually reduced from one end close to the first sub-cavity to one end close to the output pipe, so as to accelerate the flow rate of the gas-liquid mixture, so that the gas-liquid mixture is transported to the reaction tube with a certain pressure, thereby ensuring that the hydrogenation reaction proceeds continuously and stably.

[0018] (4) The heating shell is placed outside the reaction tube, so that the heat exchange channel is formed by the heating shell, the heat exchange tube and the reaction tube. In this way, during the heat exchange process, the heat exchange medium will not only exchange heat with the heat exchange tube to heat the gas-liquid mixture once, but also exchange heat with the outer wall of the reaction tube to heat the gas and liquid in the reaction twice. This is not only conducive to strengthening the gas-liquid reaction, but also conducive to improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a reaction box described in one embodiment of the present application;

[0021] Figure 2 This is an internal structural diagram of a catalytic hydrogenation device described in one embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the structure of a mixer described in one embodiment of the present application;

[0023] Figure 4 is a cross-sectional view of a mixer structure described in one embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the internal structure of the reaction tube and the heater in one embodiment of the present application.

[0025] Description of Figure Numbers:

[0026] 100. Catalytic hydrogenation equipment; 10. Mixer; 11. Mixing body; 12. Dispersion plate; 121. Dispersion hole; 13. Air inlet pipe; 14. Feed pipe; 15. Output pipe; 16. Injection chamber; 17. Mixing chamber; 171. First sub-chamber; 172. Second sub-chamber; 20. Reaction tube; 21. Input pipe; 22. Discharge pipe; 30. Reaction box; 31. Air inlet end; 32. Air outlet end; 33. Liquid discharge end; 40. Heater; 41. Heating shell; 411. Cylinder body; 412. End cover; 42. Heat exchange tube; 43. Heat exchange channel; 44. Inlet end; 45. Outflow end; 46. Inlet; 47. Discharge outlet; 50. Gas-liquid separator; 51. Gas end; 52. Liquid end.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] In one embodiment, please refer to Figures 1 to 5The present application provides a catalytic hydrogenation device 100, comprising: a reaction box 30, a mixer 10, a heater 40, a reaction tube 20 and a gas-liquid separator 50. The reaction box 30 has an air inlet end 31, an air outlet end 32 and a liquid discharge end 33. The mixer 10 is arranged in the reaction box 30, and comprises a mixture 11, a dispersion plate 12, an air inlet pipe 13, a feed pipe 14 and an output pipe 15. The dispersion plate 12 is arranged in the mixture 11 and divides the mixture 11 into an injection chamber 16 and a mixing chamber 17. The dispersion plate 12 has a plurality of dispersion holes 121. The air inlet pipe 13 is connected to the injection chamber 16, the feed pipe 14 and the output pipe 15 are both connected to the mixing chamber 17, and the air inlet pipe 13 is connected to the air inlet end 31. The heater 40 is arranged in the reaction box 30, and has an inlet end 44 and an outflow end 45. The inlet end 44 is connected to the output pipe 15. The reaction tube 20 is disposed in the reaction box 30, and one end of the reaction tube 20 is connected to the outflow end 45. The catalyst is contained in the reaction tube 20. The gas-liquid separator 50 is disposed in the reaction box 30 and is connected to the other end of the reaction tube 20. The gas-liquid separator 50 is used to separate gas and liquid, and has a gas end 51 and a liquid end 52. The gas end 51 is connected to the gas outlet end 32, and the liquid end 52 is connected to the liquid discharge end 33.

[0032] In the above-mentioned catalytic hydrogenation equipment 100, during the hydrogenation reaction, hydrogen enters the inlet pipe 13 through the inlet end 31 of the reaction box 30, then enters the injection chamber 16 through the inlet pipe 13, and then enters the mixing chamber 17 through the dispersion holes 121 of the dispersion plate 12. At this time, the hydrogen is evenly dispersed in the mixing chamber 17 under the action of the dispersion plate 12, so that the hydrogen can be evenly mixed with the material entering from the feed pipe 14 in the mixing chamber 17. The mixed gas-liquid mixture is uniformly input into the heater 40 through the output pipe 15 for preheating to reach the required temperature for the reaction; after heating, the gas-liquid mixture is transported from the outflow end 45 to the reaction tube 20 for reaction; after the reaction, it is transported to the gas-liquid separator 50 for gas-liquid separation, and the separated gas is transported from the gas end 51 to the gas outlet end 32, and the liquid is transported from the liquid end 52 to the liquid discharge end 33. In this way, the mixer 10 is cleverly designed to strengthen the mixing between the gas and liquid phases, improve the hydrogenation reaction rate, and thus improve the reaction effect.

[0033] It should be explained that the number and size of the dispersion holes 121 can be determined according to actual conditions and are not limited here. The distribution of the dispersion holes 121 on the dispersion plate 12 can be various, such as: multiple ring-shaped interval distribution; or matrix distribution.

[0034] In addition, the mixer 10, the heater 40, the reaction tube 20 and the gas-liquid separator 50 in the present embodiment are all arranged in the reaction box 30, so that the catalytic hydrogenation equipment 100 has a stronger integrity and a more compact structure. Among them, the gas-liquid separator 50 refers to a separation device that adopts the principle of centrifugal separation and wire mesh filtration to achieve liquid removal, which is mainly composed of components such as a cylinder, a cyclone separator, a high-efficiency foam breaking net, and a drain valve. Since the structure of the gas-liquid separator 50 itself is not the object to be improved in the present embodiment, it will not be introduced in detail here, and its structure can directly refer to the existing equipment. Among them, the type of catalyst in the reaction tube 20 can be selected according to the actual reaction, and is not specifically limited here.

[0035] For further information, please refer to Figure 4 , the cross-sectional area of ​​the injection chamber 16 gradually increases from the end of the injection chamber 16 close to the intake pipe 13 to the end of the injection chamber 16 close to the dispersion plate 12. It can be seen that the cross-sectional area of ​​the injection chamber 16 is gradually increased from the end close to the intake pipe 13 to the end close to the dispersion plate 12, so that the flow rate of the hydrogen output from the intake pipe 13 is gradually slowed down, which is convenient for the input hydrogen to diffuse around, and avoids the hydrogen directly and quickly impacting the middle of the dispersion plate 12, which can not only avoid the concentrated force on the dispersion plate 12, but also facilitate the diffusion of hydrogen around and flow from different dispersion holes 121 into the mixing chamber 17, which is conducive to improving the dispersion of hydrogen.

[0036] Specifically, the injection cavity 16 is a conical cavity.

[0037] In one embodiment, please refer to Figure 4 The mixing chamber 17 includes a first split chamber 171 and a second split chamber 172 which are connected. The second split chamber 172 is located on the side of the first split chamber 171 away from the dispersion plate 12. The feed pipe 14 is connected to the first split chamber 171, and the output pipe 15 is connected to the second split chamber 172. In this way, the mixing chamber 17 is divided into two parts, so that the gas and the material are mixed as much as possible in the first split chamber 171; the mixed gas-liquid mixture is stably transported to the output pipe 15 through the second split chamber 172.

[0038] For further information, please refer to Figure 4 , the cross-sectional area of ​​the second sub-cavity 172 gradually decreases from one end of the second sub-cavity 172 close to the first sub-cavity 171 to one end of the second sub-cavity 172 close to the output pipe 15. It can be seen that the cross-sectional area of ​​the second sub-cavity 172 of the mixing chamber 17 is gradually reduced from one end close to the first sub-cavity 171 to one end close to the output pipe 15, which is convenient for accelerating the flow rate of the gas-liquid mixture, so that the gas-liquid mixture is transported to the reaction tube 20 with a certain pressure, ensuring that the hydrogenation reaction is continuously and stably carried out.

[0039] In one embodiment, please refer to Figure 2 and Figure 5 The heater 40 includes a heating shell 41 and a heat exchange tube 42 disposed in the heating shell 41. A heat exchange channel 43 for heat exchange medium to flow is formed between the heat exchange tube 42 and the heating shell 41. One end of the heat exchange tube 42 is connected to the inlet end 44, and the other end of the heat exchange tube 42 is connected to the outlet end 45. It can be seen that the gas-liquid mixture enters the heat exchange tube 42 and exchanges heat with the heat exchange medium in the heat exchange channel 43, such as heat transfer oil, hot water, etc. In this way, the temperature of the gas-liquid mixture is increased, which is conducive to improving the reaction efficiency.

[0040] For further information, please refer to Figure 5 , the heating shell 41 is sleeved outside the reaction tube 20, and the heat exchange tube 42 is spirally coiled around the outer periphery of the reaction tube 20, and a heat exchange channel 43 is formed between the heating shell 41, the heat exchange tube 42 and the outer periphery of the reaction tube 20. It can be seen that the heating shell 41 is sleeved outside the reaction tube 20, so that the heat exchange channel 43 is formed by the heating shell 41, the heat exchange tube 42 and the reaction tube 20. In this way, during the heat exchange process, the heat exchange medium will not only exchange heat with the heat exchange tube 42 to heat the gas-liquid mixture once; it will also exchange heat with the outer wall of the reaction tube 20 to heat the gas and liquid in the reaction twice. This is not only conducive to strengthening the gas-liquid reaction, but also conducive to improving the heat exchange efficiency.

[0041] In order to prolong the residence time of the heat exchange medium in the heat exchange channel 43, a baffle may be provided on the inner wall of the heating shell 41 and / or the outer wall of the reaction tube 20 to slow down the circulation speed of the heat exchange medium and improve the heat exchange efficiency.

[0042] For further information, please refer to Figure 5 The heating shell 41 includes a barrel portion 411 and end cap portions 412 respectively arranged at both ends of the barrel portion 411. The barrel portion 411 is sleeved on the outer periphery of the reaction tube 20 at intervals, and the end cap portion 412 is sleeved on the reaction tube 20 and is detachably connected to the barrel portion 411. The connection between the end cap portion 412 and the barrel portion 411 may be, but is not limited to, bolt connection, clamping connection, pin connection, etc. The barrel portion 411 and the end cap portion 412 are designed to be a detachable structure, which is convenient for disassembly and assembly of the heating shell 41, maintenance and cleaning of the internal structure, and ensuring the structural stability of the catalytic hydrogenation equipment 100.

[0043] In one embodiment, please refer to Figure 2, further comprising an input pipe 21 and a discharge pipe 22, the heating shell 41 is provided with an inlet 46 and a discharge port 47 both connected to the heat exchange channel 43, the input pipe 21 is connected to the top of the reaction tube 20, the discharge pipe 22 is connected to the bottom of the reaction tube 20, the input pipe 21 is connected to the outflow end 45, the inlet 46 is located at the bottom of the heating shell 41, and the discharge port 47 is located at the top of the heating shell 41. It can be seen that the gas-liquid mixture flows from the top to the bottom in the reaction tube 20; at the same time, the heat exchange medium flows in from the inlet 46 and flows out from the discharge port 47, that is, it flows from the bottom to the top. In this way, the flow directions of the gas-liquid mixture and the heat exchange medium are opposite, which is convenient for strengthening the heat exchange between the two and improving the reaction efficiency.

[0044] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A catalytic hydrogenation device, characterized in that: include: A reaction box (30) having an air inlet end (31), an air outlet end (32) and a liquid discharge end (33); A mixer (10) is arranged in the reaction box (30), and comprises a mixing body (11), a dispersion plate (12), an air inlet pipe (13), a feed pipe (14) and an output pipe (15); the dispersion plate (12) is arranged in the mixing body (11) and divides the mixing body (11) into an injection chamber (16) and a mixing chamber (17); the dispersion plate (12) has a plurality of dispersion holes (121); the air inlet pipe (13) is in communication with the injection chamber (16); the feed pipe (14) and the output pipe (15) are both in communication with the mixing chamber (17); and the air inlet pipe (13) is in communication with the air inlet end (31); A heater (40) is disposed in the reaction box (30) and has an inlet end (44) and an outlet end (45), wherein the inlet end (44) is connected to the outlet pipe (15); A reaction tube (20) is disposed in the reaction box (30), and one end of the reaction tube is connected to the outflow end (45). The reaction tube (20) contains a catalyst; A gas-liquid separator (50) is disposed in the reaction box (30) and is connected to the other end of the reaction tube (20) for separating gas and liquid. The gas-liquid separator (50) comprises a gas end (51) and a liquid end (52). The gas end (51) is connected to the gas outlet end (32), and the liquid end (52) is connected to the liquid discharge end (33).

2. A catalytic hydrogenation equipment according to claim 1, characterized in that: The cross-sectional area of ​​the injection chamber (16) gradually increases from one end of the injection chamber (16) close to the air inlet pipe (13) to one end of the injection chamber (16) close to the dispersion plate (12).

3. A catalytic hydrogenation equipment according to claim 1, characterized in that: The mixing chamber (17) comprises a first split chamber (171) and a second split chamber (172) which are connected to each other, wherein the second split chamber (172) is located on a side of the first split chamber (171) away from the dispersion plate (12), the feed pipe (14) is connected to the first split chamber (171), and the output pipe (15) is connected to the second split chamber (172).

4. A catalytic hydrogenation equipment according to claim 3, characterized in that: The cross-sectional area of ​​the second sub-cavity (172) gradually decreases from one end of the second sub-cavity (172) close to the first sub-cavity (171) to one end of the second sub-cavity (172) close to the output tube (15).

5. A catalytic hydrogenation device according to any one of claims 1 to 4, characterized in that: The heater (40) comprises a heating shell (41) and a heat exchange tube (42) arranged in the heating shell (41); a heat exchange channel (43) for heat exchange medium to flow is formed between the heat exchange tube (42) and the heating shell (41); one end of the heat exchange tube (42) is connected to the inlet end (44), and the other end of the heat exchange tube (42) is connected to the outlet end (45).

6. A catalytic hydrogenation equipment according to claim 5, characterized in that: The heating shell (41) is sleeved outside the reaction tube (20), and the heat exchange tube (42) is spirally coiled around the outer circumference of the reaction tube (20), and the heat exchange channel (43) is formed between the heating shell (41), the heat exchange tube (42) and the outer circumference of the reaction tube (20).

7. A catalytic hydrogenation equipment according to claim 6, characterized in that: The heating shell (41) comprises a barrel portion (411) and end covers (412) respectively arranged at both ends of the barrel portion (411); the barrel portion (411) is sleeved on the outer circumference of the reaction tube (20) at intervals; the end cover (412) is sleeved on the reaction tube (20) and is detachably connected to the barrel portion (411).

8. A catalytic hydrogenation equipment according to claim 5, characterized in that: The heating shell (41) further comprises an input pipe (21) and a discharge pipe (22); an inlet (46) and a discharge port (47) both of which are in communication with the heat exchange channel (43); the input pipe (21) is in communication with the top of the reaction tube (20); the discharge pipe (22) is in communication with the bottom of the reaction tube (20); the input pipe (21) is in communication with the outflow end (45); the inlet (46) is located at the bottom of the heating shell (41); and the discharge port (47) is located at the top of the heating shell (41).

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