Hydrogenation device
By setting up a reflow mechanism between the de-weight tower and the discharge end of the hydrogenation device, and setting up a polymerization inhibitor injection port at the feed end and the reflux mechanism, secondary distillation and colloid reduction are achieved, solving the problem of low yield and quality of the existing hydrogenation device, extending the service cycle and reducing maintenance costs.
Patent Information
- Application Number
- CN202420733230.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-09
AI Technical Summary
When the existing hydrogenation device treats cracked carbon 9, the colloid content of the materials to be hydrogenated is high, resulting in low yield and quality of finished products, short service life and high maintenance costs.
A reflow mechanism is set between the weight removal tower and the discharge end. By setting a polymerization inhibitor injection port at the feed end and the reflow mechanism, the material to be distilled is mixed with the polymerization inhibitor and then entered into the weight removal tower for distillation, achieving secondary distillation and reducing colloids.
The distillation efficiency and yield of light components of the heavy-weight detachment tower are improved, the quality and yield of the finished product are improved, the service cycle of the hydrogenation device is extended, and maintenance costs are reduced.
Smart Images
Figure CN222631359U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hydrogenation reaction, and specifically relates to a hydrogenation device. Background Art
[0002] Hydrogenation devices are widely used in the pharmaceutical and chemical production industries. For example, in the chemical production process, since there are many unsaturated hydrocarbons in the cracked carbon nine and the stability is poor, it is not conducive to large-scale use. Therefore, most of the unsaturated hydrocarbons can be converted into saturated hydrocarbons through the hydrogenation device, and the stability of the cracked carbon nine after hydrogenation is significantly improved. Since the cracked carbon nine contains a large amount of self-polymers, the colloid content in the material to be hydrogenated is high and cannot meet the feed index requirements of the hydrogenation treatment. Therefore, it is necessary to set up a deweighting tower before the hydrogenation feed to distill the material to be hydrogenated.
[0003] In order to further reduce the colloid content of the material to be hydrogenated, the prior art adopts a polymerization inhibitor injection element to be arranged on the feed pipe of the deweighting tower, and the polymerization inhibitor is mixed with the raw material and then distilled to reduce the colloid content of the material to be hydrogenated. Although this method reduces the colloid content to a certain extent, the yield and quality of the finished product are not high, and the service life of the hydrogenation device is short and the maintenance cost is high. Utility Model Content
[0004] In order to solve the deficiencies of the prior art, the utility model provides a hydrogenation device, which provides a reflux mechanism between a de-weighting tower and a discharge end so that part of the distilled material can be transported back to the de-weighting tower through the reflux mechanism for re-de-weighting, thereby improving the yield of light components; and provides an inhibitor injection port at the feed end and the reflux mechanism to add an inhibitor to the material to be distilled, thereby effectively reducing the colloid content of the light components, improving the yield of the finished product, extending the service life of the hydrogenation device, and reducing the maintenance cost.
[0005] The technical effects to be achieved by the utility model are achieved through the following technical aspects:
[0006] The utility model provides a hydrogenation device, comprising a feed end, a feed heat exchange mechanism, a deweighting tower, a reflux mechanism and a discharge end connected in sequence; the feed end and the reflux mechanism are both provided with an inhibitor injection port. The reflux mechanism can make a part of the distilled material return to the deweighting tower for secondary distillation, thereby improving the distillation efficiency and the yield of the finished product; the inhibitor is mixed with the material to be distilled and then distilled, thereby effectively reducing the colloid content of the light component, improving the yield and quality of the finished product, and at the same time, being conducive to extending the service life of the hydrogenation device and reducing the maintenance cost.
[0007] As a further description of the technical solution of the utility model, the reflux mechanism includes a condenser, a reflux tank and a reflux pump which are connected in sequence, a light component output end is provided at the upper end of the deweighting tower, the condenser is connected to the light component output end, the output end of the reflux pump is connected to a reflux pipe and a discharge pipe, the reflux pipe is connected to the deweighting tower, the discharge pipe is connected to the discharge end, and the inhibitor injection port is provided between the reflux tank and the reflux pump.
[0008] As a further description of the technical solution of the utility model, the condenser is also connected to a first vacuum pump. The first vacuum pump can improve the vacuum degree in the de-weighting tower, thereby reducing the temperature of the tower top and the tower bottom, extending the service life of the distillation mechanism in the de-weighting tower, improving the finished product yield, and being conducive to improving economic benefits.
[0009] As a further description of the technical solution of the utility model, the condenser is also connected to a second vacuum pump. The second vacuum pump serves as a backup pump. When the first vacuum pump needs to be cleaned or repaired, the second vacuum pump can be activated to ensure the normal operation of the vacuum operation.
[0010] As a further description of the technical solution of the utility model, the feed heat exchange mechanism includes a first heat exchanger, a second heat exchanger and a third heat exchanger connected in sequence. By setting up three heat exchangers, heat is provided to the material to be distilled to a great extent, so that the material to be distilled has a sufficient heat base before entering the deweighting tower, which greatly reduces the heat supply of the distillation mechanism in the deweighting tower, effectively reduces energy consumption and saves costs.
[0011] As a further description of the technical solution of the utility model, the heat source of the first heat exchanger comes from the heavy component material output from the deweighting tower, the heat source of the second heat exchanger comes from the downstream reaction system, and the heat source of the third heat exchanger comes from steam. The heat sources of the first heat exchanger and the second heat exchanger both come from the heat source reused by the device itself, and only the heat source of the third heat exchanger comes from the steam supplied from the outside, which effectively reduces the production cost.
[0012] As a further description of the technical solution of the utility model, a reboiler is connected to the lower end of the deweighting tower.
[0013] As a further description of the technical solution of the utility model, the reboiler is provided with a dispersant injection port. By injecting the dispersant into the reboiler, the polymer content in the reboiler can be effectively reduced, and the bottom oil of the de-weighting tower is prevented from coking and clogging the reboiler.
[0014] As a further description of the technical solution of the utility model, the number of the reboilers is multiple. Providing multiple reboilers can improve the distillation efficiency of the deweighting tower and enhance the distillation effect.
[0015] As a further description of the technical solution of the utility model, a heavy component output terminal is provided at the lower end of the deweighting tower, and the heavy component output terminal is connected to a production pump.
[0016] In summary, the utility model has at least the following benefits:
[0017] 1. The hydrogenation device provided by the utility model provides a reflux mechanism between the de-weighting tower and the discharge end, so that part of the material after distillation in the de-weighting tower can be returned to the de-weighting tower through the reflux mechanism for secondary distillation, thereby improving the distillation efficiency of the de-weighting tower and the yield of the light component, thereby improving the quality of the finished product.
[0018] 2. The hydrogenation device provided by the utility model has an inhibitor injection port at the feed end and the reflux mechanism, so that the material to be distilled is mixed with the inhibitor and then enters the deweighting tower for distillation, which effectively reduces the colloid content of the light component, thereby improving the yield of the finished product. At the same time, it prolongs the service life of the hydrogenation device and reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is an overall structural diagram of a hydrogenation device according to Example 1 of the utility model;
[0020] Figure 2 This is a schematic diagram of the structure of the reflux mechanism of Example 1 of the utility model;
[0021] Figure 3 This is a schematic structural diagram of a feed heat exchange mechanism according to Embodiment 2 of the present utility model;
[0022] Figure 4 This is a schematic diagram of the structure of the deweighting tower of Example 3 of the utility model.
[0023] Markings in the figure:
[0024] 1. Feed end;
[0025] 2. Feed heat exchange mechanism; 21. First heat exchanger; 22. Second heat exchanger; 23. Third heat exchanger;
[0026] 3. De-weighting tower; 31. Light component output port; 32. Reboiler; 33. Dispersant injection port; 34. Heavy component output port; 35. Production pump;
[0027] 4. Reflux mechanism; 41. Condenser; 42. Reflux tank; 43. Reflux pump; 44. First vacuum pump; 45. Second vacuum pump;
[0028] 5. Discharging end;
[0029] 6. Inhibitor injection port;
[0030] A. Return pipe; B. Discharge pipe. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.
[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.
[0033] Example 1
[0034] refer to Figures 1 to 2 The hydrogenation device provided by the utility model includes a feed end 1, a feed heat exchange mechanism 2, a de-weighting tower 3, a reflux mechanism 4 and a discharge end 5 connected in sequence, and the discharge end 5 leads to the next-stage reaction system, for example, a first-stage hydrogenation reaction system. In some embodiments, the hydrogenation device also includes a first-stage hydrogenation reaction system, a second-stage hydrogenation reaction system and a stabilization tower connected in sequence, wherein the first-stage hydrogenation reaction system is connected to the discharge end 5. By arranging a reflux mechanism 4 between the de-weighting tower 3 and the discharge end 5, part of the material after distillation in the de-weighting tower 3 can be transported back to the de-weighting tower 3 through the reflux mechanism 4 for secondary distillation, which effectively improves the distillation efficiency of the de-weighting tower 3 and the yield of the light component, thereby improving the yield and quality of the finished product.
[0035] Furthermore, both the feed end 1 and the reflux mechanism 4 are provided with an inhibitor injection port 6. In some embodiments, the inhibitor injected into the inhibitor injection port 6 is a composite inhibitor, using xylene as a solvent, which will not affect the raw material components, and most of the components in the inhibitor have boiling points above 300°C, are not easy to decompose and produce small molecules during the distillation process, and will not be carried to the top of the tower and output together with the light components, effectively avoiding the requirements and restrictions of the hydrogenation catalyst on the raw material taboos in the subsequent hydrogenation reaction.
[0036] By setting the polymerization inhibitor injection port 6, the material to be distilled is mixed with the polymerization inhibitor before distillation, which effectively controls the tendency of the olefin component in the material to be distilled to generate colloid at high temperature. At the same time, the original colloid that has been generated is decomposed, cleaned and stripped, and then discharged from the bottom of the tower with the heavy component material. The injection of the polymerization inhibitor effectively reduces the colloid content in the light component, improves the quality and yield of the finished product; at the same time, it extends the service life of the hydrogenation device and reduces maintenance costs; through long-term use, it can also effectively avoid the deposition of ferrous sulfide and oligomer colloid in the hydrogenation device, reduce the safety risk of spontaneous combustion of the device, and avoid the occurrence of safety accidents. Due to the reduction of the colloid content in the light component, the feed quality of the light component is improved when entering the next-level hydrogenation reaction system, thereby extending the operation cycle of the hydrogenation reaction catalyst, which is conducive to reducing production costs and improving production efficiency.
[0037] Furthermore, the reflux mechanism 4 includes a condenser 41, a reflux tank 42 and a reflux pump 43 which are connected in sequence, a light component output terminal 31 is provided at the upper end of the deweighting tower 3, the condenser 41 is connected to the light component output terminal 31, the output end of the reflux pump 43 is connected to a reflux pipe A and a discharge pipe B, the reflux pipe A is connected to the deweighting tower 3, the discharge pipe B is connected to the discharge terminal 5, and the inhibitor injection port 6 is provided between the reflux tank 42 and the reflux pump 43. In some embodiments, the material is input from the feed end 1, mixed with the inhibitor injected from the inhibitor injection port 6 and then enters the feed heat exchange mechanism 2 for heat exchange, and then enters the deweighting tower 3 for distillation treatment. The light component material obtained by distillation is output from the light component output end 31, enters the condenser 41 for condensation and liquefaction, and then enters the reflux tank 42, and then is output from the reflux tank 42. The output material is mixed with the inhibitor injected from the inhibitor injection port 6 and flows through the reflux pump 43 together. Then the material is divided into two streams, one of which is refluxed to the deweighting tower 3 through the reflux pipe A under the action of the reflux pump 43 for secondary distillation, and the other is transported to the discharge end 5 through the discharge pipe B.
[0038] Furthermore, the condenser 41 is also connected to a first vacuum pump 44. On the one hand, the first vacuum pump 44 is used to decompress the de-weighting tower 3, and by increasing the vacuum degree in the de-weighting tower 3 and reducing the temperature of the tower top and the tower bottom of the de-weighting tower, the service life of the distillation mechanism in the de-weighting tower 3 is greatly extended, for example, the service life of the reboiler is extended, the yield of the finished product is increased, and it is beneficial to improve the economic benefits; on the other hand, part of the non-condensable gas in the condenser 41 can be extracted and discharged to the flare system through the first vacuum pump 44, so as to avoid the accumulation of non-condensable gas affecting the normal operation of the condenser 41 and the de-weighting tower 3.
[0039] Furthermore, the condenser 41 is also connected to a second vacuum pump 45. The second vacuum pump 45 serves as a backup pump. When the first vacuum pump 44 needs to be shut down for maintenance, the second vacuum pump 45 can be enabled to ensure the normal operation of the vacuum operation. In some embodiments, the input ends of the first vacuum pump 44 and the second vacuum pump 45 are both connected to a heat exchanger, for example, a U-tube heat exchanger, which is used to circulate and cool the input gas, wherein the gas flows through the tube side and the low-temperature water flows through the shell side. The U-tube heat exchanger is not only good in cooling effect, but also easy to clean. When the heat exchanger of the first vacuum pump 44 needs to be cleaned, the second vacuum pump 45 can also replace the first vacuum pump 44 to maintain the vacuum operation, thereby improving the stability of the vacuum operation and ensuring the normal and stable operation of the hydrogenation unit.
[0040] Example 2
[0041] As a further optimization of Example 1, refer to Figure 3 The feed heat exchange mechanism 2 includes a first heat exchanger 21, a second heat exchanger 22 and a third heat exchanger 23 which are connected in sequence. The three heat exchangers are arranged at the same time to exchange heat, which can greatly increase the temperature of the material to be distilled, so that the material to be distilled has a sufficient heat base before entering the deweighting tower 3, and greatly reduce the heat supply of the distillation mechanism in the deweighting tower 3, thereby reducing energy consumption and saving production costs.
[0042] As one embodiment, the heat source of the first heat exchanger 21 comes from the heavy component material output from the bottom of the deweighting tower 3, the heat source of the second heat exchanger 22 comes from the downstream reaction system, for example, the material output from the bottom of the stabilization tower, and the heat source of the third heat exchanger 23 comes from low-pressure steam. Among the three heat exchangers, only the heat source of the third heat exchanger 23 comes from the low-pressure steam supplied from the outside, while the heat sources of the first heat exchanger 21 and the second heat exchanger 22 come from the heat reused by the hydrogenation unit itself, which greatly reduces the energy consumption required by the hydrogenation unit and reduces the production and operation costs.
[0043] Example 3
[0044] As a further optimization of Example 1, refer to Figure 4 The lower end of the de-weighting tower 3 is connected to a reboiler 32, which serves as a distillation mechanism in the de-weighting tower 3, and its heat source comes from steam. In some embodiments, 3.3MPa saturated steam is used. Further, a dispersant injection port 33 is provided on the reboiler 32. By injecting a dispersant into the reboiler 32, the formation of a high concentration of easily polymerized substances in the tube bundle of the reboiler 32 tube side can be prevented, and at the same time, the polymer in the tube bundle can be stripped and dispersed into small particles. Combined with the effect of the inhibitor contained in the material, the de-weighting tower bottom oil is effectively prevented from coking and clogging the reboiler, thereby extending the operation cycle of the reboiler and reducing maintenance costs.
[0045] Furthermore, the number of reboilers 32 is multiple, preferably two. Providing two reboilers 32 can improve the distillation efficiency of the de-weighting tower 3 to a certain extent, increase the yield of light components, thereby improving the quality of the finished product, and can control the operating cost and ensure the improvement of production efficiency.
[0046] As a further optimization, a heavy component output terminal 34 is provided at the lower end of the deweighting tower 3, and the heavy component output terminal 34 is connected to a production pump 35. Through the pressurization treatment of the production pump 35, the heavy component material can be accelerated to be discharged from the heavy component output terminal 34. In some embodiments, the heavy component material discharged from the heavy component output terminal 34 can be used as a heat source for the feed heat exchange mechanism 2. The production pump 35 can also provide power for the heavy component material to enter the feed heat exchange mechanism 2, accelerate the heavy component material to enter the feed heat exchange mechanism 2, and avoid heat loss.
[0047] The utility model provides a hydrogenation device in which a reflux mechanism is provided between a de-weighting tower and a discharge end, so that part of the material after distillation can be subjected to secondary distillation, thereby improving the distillation efficiency of the de-weighting tower and the yield of light components, thereby improving the quality of the finished product; an inhibitor injection port is provided at the feed end and the reflux mechanism, so that the material to be distilled is mixed with the inhibitor before entering the de-weighting tower for distillation, thereby reducing the colloid content of the light components, improving the yield of the finished product, and at the same time, extending the service life of the hydrogenation device and reducing the maintenance cost; the first vacuum pump is provided to improve the vacuum degree in the de-weighting tower, reduce the tower top and tower bottom temperatures, extend the service life of the distillation mechanism in the de-weighting tower, and improve the yield of the finished product; the second vacuum pump is provided as a standby vacuum pump to ensure the normal and stable operation of the vacuum operation; the three heat exchangers are provided to effectively reduce energy consumption and save production costs; the dispersant injection port is provided on the reboiler to effectively reduce the polymer content in the reboiler, extend the operation cycle of the reboiler, and reduce the maintenance cost.
[0048] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0049] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0050] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0051] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.
Claims
1. A hydrogenation device, characterized in that: It comprises a feed end (1), a feed heat exchange mechanism (2), a deweighting tower (3), a reflux mechanism (4) and a discharge end (5) which are connected in sequence, wherein the feed end (1) and the reflux mechanism (4) are both provided with an inhibitor injection port (6); The reflux mechanism (4) comprises a condenser (41), a reflux tank (42) and a reflux pump (43) which are connected in sequence. A light component output end (31) is provided at the upper end of the deweighting tower (3). The condenser (41) is connected to the light component output end (31). The output end of the reflux pump (43) is connected to a reflux pipeline (A) and a discharge pipeline (B). The reflux pipeline (A) is connected to the deweighting tower (3). The discharge pipeline (B) is connected to the discharge end (5). The inhibitor injection port (6) is provided between the reflux tank (42) and the reflux pump (43).
2. The hydrogenation device according to claim 1, characterized in that: The condenser (41) is also connected to a first vacuum pump (44).
3. The hydrogenation device according to claim 2, characterized in that: The condenser (41) is also connected to a second vacuum pump (45).
4. The hydrogenation device according to claim 1, characterized in that: The feed heat exchange mechanism (2) comprises a first heat exchanger (21), a second heat exchanger (22) and a third heat exchanger (23) which are connected in sequence.
5. The hydrogenation device according to claim 4, characterized in that: The heat source of the first heat exchanger (21) comes from the heavy component material output from the deweighting tower (3), the heat source of the second heat exchanger (22) comes from the downstream reaction system, and the heat source of the third heat exchanger (23) comes from steam.
6. The hydrogenation device according to claim 1, characterized in that: The lower end of the deweighting tower (3) is connected to a reboiler (32).
7. The hydrogenation device according to claim 6, characterized in that: The reboiler (32) is provided with a dispersant injection port (33).
8. The hydrogenation device according to claim 6 or 7, characterized in that: The number of the reboilers (32) is plural.
9. The hydrogenation device according to claim 1, characterized in that: The lower end of the deweighting tower (3) is provided with a heavy component output end (34), and the heavy component output end (34) is connected to a production pump (35).