Multi-stage continuous hydrogenation device
By dividing the caprolactam production device into a multi-stage hydrogenation reaction chamber, the problem of decreasing catalyst activity is solved, the continuous production of the device and the efficient utilization of the catalyst are achieved, and the production cost is reduced.
Patent Information
- Application Number
- CN202422091042.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The existing caprolactam production device has reduced the activity of the hydrogenation catalyst during continuous operation, resulting in the inability to ensure the continuous production of the device. The existing technology solves the problem by adjusting the reaction pressure and temperature, but the effect is limited, and the catalyst is easy to be plated, so it is necessary to stop frequently to replace the catalyst.
A multi-stage continuous hydrogenation device is adopted to divide the reactor cylinder into multiple hydrogenation reaction chambers. Each reaction chamber can be operated independently, and the hydrogenation is performed in segments through parallel and series methods to reduce catalyst consumption and ensure the continuous production of the device.
The thoroughness of the hydrogenation reaction and continuous production of the device are achieved, which reduces the number of starts and stops, reduces the consumption of catalysts, and improves production efficiency and economic benefits.
Smart Images
Figure CN223249274U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of caprolactam production, in particular to a multi-stage continuous hydrogenation device. Background Art
[0002] In the current caprolactam production process, hexyl water can be converted into saturated impurities by a hydrogenation catalyst, facilitating impurity removal in subsequent steps. However, continuous operation of this device leads to a decrease in the activity of the hydrogenation catalyst. To ensure the hydrogenation effect, the reaction pressure and temperature must be adjusted. However, increasing the pressure exacerbates catalyst agglomeration and compresses the catalyst surface area; increasing the reaction temperature causes caprolactam polymerization and exacerbates catalyst agglomeration. If the hydrogenation effect is still insufficient after increasing the reaction pressure and temperature, the device must be shut down and the catalyst replaced. However, the catalyst in the existing hydrogenation reactor has an operating cycle of two years, which cannot guarantee continuous production operation.
[0003] Based on this, a multi-stage continuous hydrogenation device is now provided to eliminate the drawbacks of the existing technical solutions. Utility Model Content
[0004] The purpose of the utility model is to provide a multi-stage continuous hydrogenation device to solve the problem in the background art that the continuous production operation of the device cannot be guaranteed.
[0005] To achieve the above objectives, the present invention provides the following technical solutions:
[0006] A multi-stage continuous hydrogenation device comprises a reactor cylinder, a mixer for mixing hydrogen and hexyl water is provided on one side of the reactor cylinder, a hexyl water pipeline is provided on a side of the mixer away from the reactor cylinder, and a hydrogen pipeline is connected to one side of the hexyl water pipeline;
[0007] The reactor further includes a first-stage hydrogenation reaction chamber, which is arranged inside the reactor cylinder; a second-stage hydrogenation reaction chamber, which is arranged below the first-stage hydrogenation reaction chamber; a third-stage hydrogenation reaction chamber, which is arranged below the second-stage hydrogenation reaction chamber; and a fourth-stage hydrogenation reaction chamber, which is arranged below the third-stage hydrogenation reaction chamber.
[0008] Preferably, a tail gas pipeline is provided on the top of the hydrogenation reaction chamber, an inlet check valve is connected to the left side of the hydrogenation reaction chamber, the other end of the inlet check valve is connected to an inlet quick-closing valve, an outlet check valve is connected to the right side of the hydrogenation reaction chamber, and an outlet quick-closing valve is provided on the side of the outlet check valve away from the reactor cylinder.
[0009] Preferably, a second-stage tail gas pipeline is provided on the left side of the second-stage hydrogenation reaction chamber, and two-stage inlet quick-closing valves are connected to the left and right sides of the second-stage hydrogenation reaction chamber. Two second-stage inlet quick-closing valves are provided with a second-stage inlet check valve on the side close to the reactor cylinder, and the second-stage inlet quick-closing valve on the right side is connected to the first-stage outlet quick-closing valve. The right side of the second-stage hydrogenation reaction chamber is connected to a second-stage outlet check valve, and a second-stage outlet quick-closing valve is provided on the side of the second-stage outlet check valve away from the reactor cylinder.
[0010] Preferably, three sections of tail gas pipelines are provided on the left side of the three-stage hydrogenation reaction chamber, and three sections of inlet quick-closing valves are connected to the left and right sides of the three-stage hydrogenation reaction chamber. Three sections of inlet check valves are provided on the side of the two three-stage inlet check valves close to the reactor cylinder. The three-section inlet quick-closing valve on the right side is connected to the two-section outlet quick-closing valve on the right side. The three-section outlet check valve is connected to the right side of the three-stage hydrogenation reaction chamber, and three sections of outlet check valves are provided on the side away from the reactor cylinder.
[0011] Preferably, four sections of tail gas pipelines are provided on the left side of the four-stage hydrogenation reaction chamber, and four sections of inlet quick-closing valves are connected to the left and right sides of the four-stage hydrogenation reaction chamber. Four sections of inlet check valves are provided on the side of the two four-stage inlet quick-closing valves close to the reactor cylinder, and the four-section inlet quick-closing valve on the right side is connected to the three-section outlet quick-closing valve on the right side. Four sections of outlet check valves are connected to the right side of the four-stage hydrogenation reaction chamber, and four sections of outlet check valves are provided on the side away from the reactor cylinder.
[0012] Preferably, a pre-hydrogenation hexyl water pipeline is provided on one side of the mixer close to the reactor cylinder, and the other end of the pre-hydrogenation hexyl water pipeline is connected to the second-stage inlet fast-closing valve, the third-stage inlet fast-closing valve, the fourth-stage inlet fast-closing valve, and the first-stage inlet fast-closing valve located on the left side through a first connecting pipeline.
[0013] Preferably, a hydrogenated hexyl water pipeline is provided on one side of the reactor cylinder, and one end of the hydrogenated hexyl water pipeline is connected to the second-stage quick-closing valve, the third-stage quick-closing valve, the fourth-stage quick-closing valve and the first-stage quick-closing valve located on the right side through a second connecting pipeline.
[0014] Preferably, the specifications and sizes of the first-stage hydrogenation reaction chamber, the second-stage hydrogenation reaction chamber, the third-stage hydrogenation reaction chamber and the fourth-stage hydrogenation reaction chamber are compatible.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0016] The utility model provides a multi-stage continuous hydrogenation device, which cuts the existing reactor cylinder into sections and sets a plurality of hydrogenation reaction chambers, so that each reaction chamber can be entered and exited, thereby performing segmented hydrogenation operations, which can ensure the continuous production of the device and reduce the number of start-up and shutdown times. In addition, a method for parallel and series hydrogenation is provided, which has a wide range of applications and is applicable to multiple continuous reactions in an environment with only a single reactor, thereby reducing catalyst consumption and achieving the purpose of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural diagram of the present utility model.
[0018] Figure 2 It is a structural schematic diagram of one side of the entire utility model.
[0019] Figure 3 It is a structural schematic diagram of the other side of the entire utility model.
[0020] : Notes on the accompanying drawings: mixer 1, hexyl water pipeline 2, hydrogen pipeline 3, first-stage hydrogenation reaction chamber 4, second-stage hydrogenation reaction chamber 5, third-stage hydrogenation reaction chamber 6, fourth-stage hydrogenation reaction chamber 7, hexyl water pipeline before hydrogenation 8, hexyl water pipeline after hydrogenation 9, first-stage tail gas pipeline 41, first-stage inlet check valve 42, first-stage inlet quick-closing valve 43, first-stage outlet check valve 44, first-stage outlet quick-closing valve 45, second-stage tail gas pipeline 51, second-stage inlet quick-closing valve 52, second-stage inlet check valve 53, second-stage outlet check valve 54, second-stage outlet quick-closing valve 55, third-stage tail gas pipeline 61, third-stage inlet quick-closing valve 62, third-stage inlet check valve 63, third-stage outlet check valve 64, third-stage outlet quick-closing valve 65, fourth-stage tail gas pipeline 71, fourth-stage inlet quick-closing valve 72, fourth-stage inlet check valve 73, fourth-stage outlet check valve 74, fourth-stage outlet quick-closing valve 75. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
[0022] Example 1
[0023] In this embodiment, if Figure 1-Figure 3 As shown, a multi-stage continuous hydrogenation device includes a reactor cylinder. A mixer 1 for mixing hydrogen and hexyl water is provided on one side of the reactor cylinder. The mixer 1 has a common mixer structure in the art and is convenient for ensuring normal use of the device. A hexyl water pipeline 2 is provided on the side of the mixer 1 away from the reactor cylinder to facilitate the addition of hexyl water. A hydrogen pipeline 3 is connected to one side of the hexyl water pipeline 2 to facilitate the addition of hydrogen.
[0024] The device further comprises a first-stage hydrogenation reaction chamber 4, which is arranged inside the reactor cylinder; a second-stage hydrogenation reaction chamber 5, wherein a plurality of hydrogenation reaction chambers are provided so that each reaction chamber can be entered and exited, thereby performing a staged hydrogenation operation; the second-stage hydrogenation reaction chamber 5 is arranged below the first-stage hydrogenation reaction chamber 4; a third-stage hydrogenation reaction chamber 6, which is arranged below the second-stage hydrogenation reaction chamber 5; and a fourth-stage hydrogenation reaction chamber 7, which is arranged below the third-stage hydrogenation reaction chamber 6. Before the multi-stage continuous hydrogenation device is put into use, the device is first checked to see if it can be used normally, and the valves at different positions are opened and closed to put the device into a standby state.
[0025] Among them Figure 2 and Figure 3 As shown, a tail gas pipeline 41 is provided on the top of the first-stage hydrogenation reaction chamber 4 to facilitate exhaust of the tail gas. An inlet check valve 42 is connected to the left side of the first-stage hydrogenation reaction chamber 4. The other end of the inlet check valve 42 is connected to an inlet quick-closing valve 43 to facilitate control of the input of the hydrogenation catalyst. An outlet check valve 44 is connected to the right side of the first-stage hydrogenation reaction chamber 4. An outlet quick-closing valve 45 is provided on the side of the outlet check valve 44 away from the reactor cylinder to increase the structural stability of the device, avoid interference, and facilitate opening and closing operations of different pipelines according to different valves.
[0026] Among them Figure 2 and Figure 3 As shown, a second tail gas pipeline 51 is provided on the left side of the second-stage hydrogenation reaction chamber 5 to facilitate the discharge of tail gas. The left and right sides of the second-stage hydrogenation reaction chamber 5 are connected to two-stage inlet quick-closing valves 52 to facilitate the control of the input of hydrogenation catalyst. The two second-stage inlet quick-closing valves 52 are each provided with a second-stage inlet check valve 53 on the side close to the reactor cylinder. The second-stage inlet quick-closing valve 52 on the right side is connected to the first-stage outlet quick-closing valve 45. The right side of the second-stage hydrogenation reaction chamber 5 is connected to a second-stage outlet check valve 54. The second-stage outlet check valve 54 is provided with a second-stage outlet quick-closing valve 55 on the side away from the reactor cylinder to facilitate the single-stage cutout of the reaction chamber for catalyst replacement operation, thereby ensuring the continuous production of the device.
[0027] Among them Figure 2 and Figure 3As shown, a three-stage tail gas pipeline 61 is provided on the left side of the three-stage hydrogenation reaction chamber 6 to facilitate the discharge of tail gas. The left and right sides of the three-stage hydrogenation reaction chamber 6 are connected to three-stage inlet fast-closing valves 62 to facilitate the control of the input of hydrogenation catalyst. The two three-stage inlet fast-closing valves 62 are each provided with a three-stage inlet check valve 63 on the side close to the reactor cylinder. The three-stage inlet fast-closing valve 62 on the right side is connected to the two-stage outlet fast-closing valve 55 on the right side. The right side of the three-stage hydrogenation reaction chamber 6 is connected to a three-stage outlet check valve 64. The three-stage outlet check valve 64 is provided with a three-stage outlet fast-closing valve 65 on the side away from the reactor cylinder. Staged hydrogenation can make the catalyst reaction more thorough and reduce catalyst consumption.
[0028] Among them Figure 2 and Figure 3 As shown, a four-stage tail gas pipeline 71 is provided on the left side of the four-stage hydrogenation reaction chamber 7 to facilitate the discharge of tail gas. The left and right sides of the four-stage hydrogenation reaction chamber 7 are connected to four-stage inlet fast-closing valves 72 to facilitate the control of the input of hydrogenation catalyst. The two four-stage inlet fast-closing valves 72 are each provided with a four-stage inlet check valve 73 on the side close to the reactor cylinder. The four-stage inlet fast-closing valve 72 on the right side is connected to the three-stage outlet fast-closing valve 65 on the right side. The right side of the four-stage hydrogenation reaction chamber 7 is connected to a four-stage outlet check valve 74. The four-stage outlet check valve 74 is provided with a four-stage outlet fast-closing valve 75 on the side away from the reactor cylinder to ensure the normal use of the device.
[0029] Example 2
[0030] The difference from Example 1 is that Figure 1-Figure 3 As shown, a pre-hydrogenation hexyl water pipeline 8 is provided on one side of the mixer 1 close to the reactor cylinder, and the other end of the pre-hydrogenation hexyl water pipeline 8 is connected to the second-stage inlet fast-closing valve 52, the third-stage inlet fast-closing valve 62, the fourth-stage inlet fast-closing valve 72, and the first-stage inlet fast-closing valve 43 located on the left side through a first connecting pipeline, so as to facilitate the transportation of hexyl water and hydrogenation catalyst to the corresponding hydrogenation reaction chamber;
[0031] Among them Figure 1-Figure 3 As shown, a hydrogenated hexyl water pipeline 9 is provided on one side of the reactor cylinder. One end of the hydrogenated hexyl water pipeline 9 is connected to the second-stage outlet quick-closing valve 55, the third-stage outlet quick-closing valve 65, the fourth-stage outlet quick-closing valve 75, and the first-stage outlet quick-closing valve 45 on the right side through a second connecting pipeline, so as to facilitate the transportation of the reacted material to subsequent equipment.
[0032] Among them Figure 1 As shown, the specifications and sizes of the first-stage hydrogenation reaction chamber 4, the second-stage hydrogenation reaction chamber 5, the third-stage hydrogenation reaction chamber 6 and the fourth-stage hydrogenation reaction chamber 7 are adapted to each other, ensuring the overall use effect of the device.
[0033] During use, multi-stage continuous hydrogenation is used to make the hydrogenation reaction more thorough. When the reaction activity of a certain section of the hydrogenation reaction chamber in the reactor cylinder decreases, the section can be cut out separately to replace the catalyst to ensure continuous production of the device. Segmented hydrogenation can easily make the quality of the catalyst in each section lower than the quality of the current single kettle. When compaction occurs, it is easier to replace the catalyst. When the reaction activity of a single kettle decreases, some catalyst in the reactor has not reacted completely. At this time, it is extremely wasteful to replace the catalyst. Segmented hydrogenation can make the catalyst reaction more thorough and reduce catalyst consumption.
[0034] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.
Claims
1. A multi-stage continuous hydrogenation device, comprising a reactor barrel, characterized in that: A mixer (1) for mixing hydrogen and hexyl water is provided on one side of the reactor cylinder, a hexyl water pipeline (2) is provided on the side of the mixer (1) away from the reactor cylinder, and a hydrogen pipeline (3) is connected to one side of the hexyl water pipeline (2); The reactor further comprises a first-stage hydrogenation reaction chamber (4), wherein the first-stage hydrogenation reaction chamber (4) is arranged inside the reactor cylinder; A second-stage hydrogenation reaction chamber (5), wherein the second-stage hydrogenation reaction chamber (5) is arranged below the first-stage hydrogenation reaction chamber (4); A three-stage hydrogenation reaction chamber (6), wherein the three-stage hydrogenation reaction chamber (6) is arranged below the second-stage hydrogenation reaction chamber (5); The four-stage hydrogenation reaction chamber (7) is arranged below the three-stage hydrogenation reaction chamber (6).
2. The multi-stage continuous hydrogenation device according to claim 1, characterized in that: A tail gas pipeline (41) is provided on the top of the first section of the hydrogenation reaction chamber (4), a first section of the inlet check valve (42) is connected to the left side of the first section of the hydrogenation reaction chamber (4), the other end of the first section of the inlet check valve (42) is connected to a first section of the inlet quick-closing valve (43), the right side of the first section of the hydrogenation reaction chamber (4) is connected to a first section of the outlet check valve (44), and a first section of the outlet quick-closing valve (45) is provided on the side of the first section of the outlet check valve (44) away from the reactor cylinder.
3. The multi-stage continuous hydrogenation device according to claim 2, characterized in that: A second tail gas pipeline (51) is provided on the left side of the second hydrogenation reaction chamber (5), and two second inlet quick-closing valves (52) are connected to the left and right sides of the second hydrogenation reaction chamber (5). Two second inlet quick-closing valves (52) are provided on the side close to the reactor cylinder with a second inlet check valve (53). The second inlet quick-closing valve (52) on the right side is connected to the first outlet quick-closing valve (45). The right side of the second hydrogenation reaction chamber (5) is connected to a second outlet check valve (54), and a second outlet quick-closing valve (55) is provided on the side of the second outlet check valve (54) away from the reactor cylinder.
4. The multi-stage continuous hydrogenation device according to claim 3, characterized in that: A three-stage tail gas pipeline (61) is provided on the left side of the three-stage hydrogenation reaction chamber (6), and three-stage inlet quick-closing valves (62) are connected to the left and right sides of the three-stage hydrogenation reaction chamber (6). A three-stage inlet check valve (63) is provided on the side of the two three-stage inlet quick-closing valves (62) close to the reactor cylinder. The three-stage inlet quick-closing valve (62) located on the right side is connected to the two-stage outlet quick-closing valve (55) located on the right side. A three-stage outlet check valve (64) is connected to the right side of the three-stage hydrogenation reaction chamber (6), and a three-stage outlet quick-closing valve (65) is provided on the side of the three-stage outlet check valve (64) away from the reactor cylinder.
5. The multi-stage continuous hydrogenation device according to claim 4, characterized in that: A four-stage tail gas pipeline (71) is provided on the left side of the four-stage hydrogenation reaction chamber (7), and four-stage inlet quick-closing valves (72) are connected to the left and right sides of the four-stage hydrogenation reaction chamber (7). Four-stage inlet check valves (73) are provided on the side close to the reactor cylinder of the two four-stage inlet quick-closing valves (72). The four-stage inlet quick-closing valve (72) located on the right side is connected to the three-stage outlet quick-closing valve (65) located on the right side. A four-stage outlet check valve (74) is connected to the right side of the four-stage hydrogenation reaction chamber (7), and a four-stage outlet quick-closing valve (75) is provided on the side of the four-stage outlet check valve (74) away from the reactor cylinder.
6. The multi-stage continuous hydrogenation device according to claim 5, characterized in that: A pre-hydrogenation hexyl water pipeline (8) is provided on one side of the mixer (1) close to the reactor cylinder, and the other end of the pre-hydrogenation hexyl water pipeline (8) is connected to the second-stage inlet fast-closing valve (52), the third-stage inlet fast-closing valve (62), the fourth-stage inlet fast-closing valve (72), and the first-stage inlet fast-closing valve (43) located on the left side through a first connecting pipeline.
7. The multi-stage continuous hydrogenation device according to claim 5, characterized in that: A hydrogenated hexyl water pipeline (9) is provided on one side of the reactor cylinder, and one end of the hydrogenated hexyl water pipeline (9) is connected to the second-stage outlet quick-closing valve (55), the third-stage outlet quick-closing valve (65), the fourth-stage outlet quick-closing valve (75), and the first-stage outlet quick-closing valve (45) located on the right side through a second connecting pipeline.
8. The multi-stage continuous hydrogenation device according to claim 1, characterized in that: The specifications and sizes of the first-stage hydrogenation reaction chamber (4), the second-stage hydrogenation reaction chamber (5), the third-stage hydrogenation reaction chamber (6) and the fourth-stage hydrogenation reaction chamber (7) are compatible.