Hydrogenation catalyst activity protection washing dust remover for hydrogen peroxide production
By designing a protective water-washing dust collector for hydrogenated catalysts, and utilizing a composite sieve plate and countercurrent contact of washing water to remove alumina powder, the problem of reduced activity caused by alumina powder entering the hydrogenated catalyst was solved, achieving stable production and cost reduction.
Patent Information
- Application Number
- CN202520314152.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-26
AI Technical Summary
In the existing hydrogen peroxide production process, the presence of alumina powder in the hydrogenation catalyst leads to a decrease in its activity, affecting production stability and cost. Existing measures are insufficient to completely resolve this issue.
A protective hydrogenated catalyst active water washing dust collector is designed, which uses a composite sieve plate and countercurrent contact of washing water to remove alumina powder, and performs oil-water separation through oil-water separation packing and coalescing water removal filter element. Sight glasses and anti-rotation cross plates are set to ensure stable flow.
It effectively removes alumina powder, stabilizes the activity of hydrogenated catalysts, reduces production costs, improves production stability, reduces equipment investment, and extends catalyst life.
Smart Images
Figure CN223887692U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydrogen peroxide production technology, specifically to a protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production. Background Technology
[0002] In the hydrogen peroxide production field, fixed-bed hydrogen peroxide production technology is currently the main technology used in China, with the fully acidic fixed-bed hydrogen peroxide production process being widely applied. However, this process faces many problems related to alumina powder during actual operation, seriously affecting production stability, cost control, and product quality.
[0003] In the all-acid fixed-bed hydrogen peroxide production process, the clay bed is a key component of the regeneration process. While the activated alumina within the clay bed plays a role in regenerating anthraquinone degradation products, it also generates alumina powder. When the clay bed is integrated into the system, this alumina powder enters the hydrogenation tower along with the working fluid. The fine alumina powder (≤1μm) entering the hydrogenation tower has strong adsorption properties and adheres to the micropores on the surface of the hydrogenation catalyst. This phenomenon directly leads to a decrease in the activity of the hydrogenation catalyst, reducing the efficiency of the hydrogenation reaction.
[0004] To maintain production output, manufacturers have had to increase the temperature of the hydrogenation reaction. However, this increased temperature brings a series of negative effects: First, anthraquinone degradation is accelerated, not only increasing anthraquinone consumption but also requiring a corresponding increase in the active alumina consumption for regenerating anthraquinone degradation products, significantly raising production costs. Second, the temperature of the working fluid entering the hydrogenation tower gradually increases from the initial low limit temperature (36-38°C) during startup, requiring a significant expansion of the heat exchanger design range, directly leading to increased heat exchanger procurement costs and presenting more difficulties in designing the heat exchange method. Furthermore, due to the increased degradation products, the operating conditions of the extraction tower become unstable, requiring frequent adjustments, further affecting production stability.
[0005] To address these issues, various measures have been implemented in the industry. For example, when activated alumina is loaded into the clay bed, a blower is used to remove surface alumina powder, but this method is insufficient to completely remove the powder. Two-stage fine filters are installed at the clay bed outlet: the first stage uses a 2-micron glass fiber filter, and the second stage uses a 1-micron polytetrafluoroethylene (PTFE) membrane filter. However, even after two stages of filtration, some alumina powder smaller than 1 micron still enters the hydrogenation tower. Other methods include allowing the working fluid to adhere the alumina powder from the alumina balls to the working fluid before integrating the clay bed into the system, then removing the working fluid from the system, washing it with water, and reusing it. Additionally, when integrating the clay bed into the system, the working fluid inlet valve is slowly opened to prevent alumina powder from being carried out. However, none of these methods can fundamentally eliminate the impact of alumina powder on the activity of the hydrogenation catalyst.
[0006] Against this backdrop, the development of a device that can efficiently remove alumina powder from the working fluid, thereby protecting the activity of the hydrogenated catalyst, is particularly urgent.
[0007] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content
[0008] In view of the problems in related technologies, the purpose of this utility model is to propose a protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production, so as to overcome the above-mentioned technical problems existing in the existing related technologies.
[0009] The technical solution of this utility model is implemented as follows:
[0010] A protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production includes: a cylindrical body, a working fluid outlet at the top of the cylindrical body, a cleaning water outlet at the bottom of the cylindrical body, and a cleaning water distribution pipe and a working fluid distribution pipe inside the cylindrical body, wherein the working fluid distribution pipe is located below the cleaning water distribution pipe;
[0011] Several layers of composite sieve plates are provided between the cleaning water distribution pipe and the working fluid distribution pipe. The composite sieve plates are connected to a downcomer. A support grid plate and a pressure plate are sequentially provided on the top of the cleaning water distribution pipe. Oil-water separation packing is provided between the support grid plate and the pressure plate. A coalescing dewatering filter element is provided on the top of the pressure plate. A water collection tank is provided outside the coalescing dewatering filter element.
[0012] Furthermore, the cleaning water outlet is equipped with an anti-rotation cross plate.
[0013] Furthermore, the cleaning water distribution pipe is equipped with a cleaning water inlet.
[0014] Furthermore, the working fluid distribution pipe is provided with a working fluid inlet.
[0015] Furthermore, several sight glasses are provided between the cleaning water distribution pipe and the working fluid distribution pipe.
[0016] Furthermore, the composite sieve plate has at least five layers, and the five layers of the composite sieve plate are arranged in a vertical array.
[0017] Furthermore, the top of the pressure plate is provided with a perforated plate, the coalescing dewatering filter element is disposed inside the perforated plate, and the water collection trough is arranged in a ring outside the perforated plate.
[0018] The beneficial effects of this utility model are:
[0019] 1. This invention efficiently removes alumina powder. The working fluid and cleaning water come into countercurrent contact at a composite sieve plate, allowing the alumina powder carried in the working fluid to be effectively washed away by the cleaning water. The composite sieve plate consists of at least five layers arranged in a vertical array, increasing the contact area and time between the two phases, thus improving washing efficiency. This ensures that a large amount of alumina powder in the working fluid is carried away by the cleaning water and discharged through the cleaning water outlet, thereby reducing the amount of alumina powder entering subsequent processes and preventing it from adversely affecting the activity of the hydrogenation catalyst.
[0020] 2. This utility model achieves excellent oil-water separation by utilizing the synergistic effect of the oil-water separation packing and the coalescing dewatering filter element to efficiently separate the oil and water in the washed working fluid. The oil-water separation packing initially separates the entrained water phase from the working fluid, while the coalescing dewatering filter element further removes any remaining small water droplets, ensuring that the working fluid entering the regenerated liquid storage tank has extremely low water content. This guarantees the quality of the working fluid and facilitates the stable operation of subsequent production processes.
[0021] 3. This invention stabilizes the activity of the hydrogenation catalyst. Because it effectively removes alumina powder from the working solution, the hydrogenation catalyst is no longer negatively affected by alumina powder, and its activity can remain stable for a long time. This avoids frequent increases in the hydrogenation reaction temperature due to decreased catalyst activity, reduces anthraquinone degradation and consumption, and also reduces the consumption of active alumina from regenerated anthraquinone degradation products, extending the catalyst's lifespan and lowering production costs.
[0022] 4. This utility model facilitates observation and control. Several sight glasses are installed between the cleaning water distribution pipe and the working fluid distribution pipe, allowing operators to observe the flow status and contact conditions of the working fluid and cleaning water inside the equipment in real time. Based on the observed conditions, the flow rate, velocity, and other parameters of the working fluid and cleaning water can be adjusted in a timely manner to ensure that the equipment is in optimal operating condition and improve the washing, dust removal, and oil-water separation effects.
[0023] 5. This utility model prevents interference from liquid swirling. The anti-swirling cross plate installed inside the cleaning water outlet effectively prevents swirling when the cleaning water is discharged. This avoids swirling interfering with the normal flow of the working fluid and cleaning water inside the equipment, ensuring that the working fluid rises evenly and the cleaning water falls evenly, maintaining a stable countercurrent contact process, and ensuring the stability of the washing and separation effect.
[0024] 6. This utility model saves on equipment investment costs. By using this water-washing dust collector in the hydrogen peroxide production process, the secondary fine filter (after the clay bed) used to remove alumina powder in the original process can be eliminated. This saves on the investment cost of the secondary filter and the cost of replacing filter elements during normal production. Furthermore, because the catalyst activity is stable, there is no need to consider adding multiple catalysts or using a dual-tower series process, reducing the investment costs of a hydrogenation tower, two intermediate hydrogenation pumps, one intermediate hydrogenation cooler, two intermediate hydrogenation filters, and corresponding valves and pipelines, thus lowering the overall equipment investment cost.
[0025] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.
[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the structure of a protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production according to an embodiment of the present utility model;
[0029] In the picture:
[0030] 1. Cylinder; 2. Working fluid outlet; 3. Cleaning water outlet; 4. Cleaning water distribution pipe; 5. Working fluid distribution pipe; 6. Composite sieve plate; 7. Downcomer; 8. Support grid plate; 9. Pressure plate; 10. Oil-water separation packing; 11. Water collection tank; 12. Coalescing water removal filter element; 13. Anti-rotation cross plate; 14. Cleaning water inlet; 15. Working fluid inlet; 16. Sight glass. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0032] According to an embodiment of the present invention, a protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production is provided.
[0033] like Figure 1As shown, a protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production includes: a cylinder 1, a working fluid outlet 2 at the top of the cylinder 1, a cleaning water outlet 3 at the bottom of the cylinder 1, and a cleaning water distribution pipe 4 and a working fluid distribution pipe 5 inside the cylinder 1, wherein the working fluid distribution pipe 5 is located below the cleaning water distribution pipe 4;
[0034] Several layers of composite screen plates 6 are provided between the cleaning water distribution pipe 4 and the working fluid distribution pipe 5. The composite screen plates 6 are connected to the downcomer pipe 7. The top of the cleaning water distribution pipe 4 is provided with a support grid plate 8 and a pressure plate 9 in sequence. The oil-water separation packing 10 is provided between the support grid plate 8 and the pressure plate 9. The top of the pressure plate 9 is provided with a coalescing dewatering filter element 12. A water collection tank 11 is provided outside the coalescing dewatering filter element 12.
[0035] The cleaning water distribution pipe 4 is equipped with a cleaning water inlet 14, and the working fluid distribution pipe 5 is equipped with a working fluid inlet 15.
[0036] Among them, the composite sieve plate 6 has at least five layers, and the five layers of composite sieve plate 6 are arranged in a vertical array.
[0037] In addition, several sight glasses 16 are provided between the cleaning water distribution pipe 4 and the working fluid distribution pipe 5.
[0038] Among them, the cleaning water outlet 3 is equipped with an anti-rotation cross plate 13.
[0039] Among them, the oil-water separation packing 10 can be made of PP packing.
[0040] The pressure plate 9 has a perforated plate on top, the coalescing dewatering filter element 12 is disposed inside the perforated plate, and the water collection tank 11 is arranged in a ring outside the perforated plate.
[0041] Using the above solution, the application includes the following steps:
[0042] Open the valve at the working fluid inlet 15 beforehand to allow the working fluid from the post-filter of the clay bed to enter the working fluid distribution pipe 5 at a suitable flow rate and velocity. Under the action of the working fluid distribution pipe 5, the working fluid is dispersed into countless tiny droplets that float upwards, preparing for subsequent countercurrent contact with the cleaning water.
[0043] Simultaneously, open the valve at the cleaning water inlet 14 to allow clean cleaning water to enter the cleaning water distribution pipe 4. After being dispersed by the cleaning water distribution pipe 4, the cleaning water flows downward through the downcomer 7 of the composite sieve plate 6, forming a continuous phase that comes into countercurrent contact with the upward-floating working fluid droplets in the area of the composite sieve plate 6. During this countercurrent contact, the alumina powder in the working fluid is washed by the cleaning water and carried into the cleaning water.
[0044] The washed working fluid continues to flow upwards, first passing through the oil-water separation packing 10. The oil-water separation packing 10 is positioned between the support grid plate 8 and the pressure plate 9, which can initially separate the water phase entrained in the working fluid. Next, the working fluid continues to float upwards into the working fluid coalescing filter element 12. During the process of penetrating the coalescing filter element 12, the small water droplets entrained are transformed into larger droplets by the action of the coalescing filter element. These larger droplets flow towards the lower water collection tank 11 under the influence of gravity. This results in a relatively pure working fluid, which finally flows into the regenerated liquid storage tank through the working fluid outlet 2. The cleaning water containing impurities such as alumina powder is discharged from the equipment through the cleaning water outlet 3. The anti-swirling cross plate 13 prevents swirling flow when the cleaning water is discharged, ensuring a stable flow field within the equipment.
[0045] In addition, during application, operators can observe the internal conditions of the equipment in real time through sight glass 16. They should observe the flow status of the working fluid and cleaning water, ensuring that the working fluid droplets continuously float upwards and the cleaning water flows evenly downwards. If any abnormalities are found, such as uneven flow of the working fluid droplets or deviation of the cleaning water flow, the flow rate and velocity of the working fluid and cleaning water should be adjusted promptly, which can be achieved by adjusting the opening of the inlet valve.
[0046] Meanwhile, the flow rates of the working fluid and cleaning water should be reasonably controlled according to the actual production situation. Generally, the flow rate of the working fluid should be kept stable to ensure the continuity of production; the flow rate of the cleaning water can be adjusted appropriately according to the alumina powder content in the working fluid. If the alumina powder content in the working fluid is high, the flow rate of the cleaning water can be increased appropriately to improve the washing effect.
[0047] In addition, regularly check the liquid level in the water collection tank 11 to ensure that the liquid level is within the normal range. If the liquid level is too high, it may affect the working effect of the coalescing dewatering filter element 12. In this case, the water in the water collection tank 11 can be drained through the drain pipe.
[0048] In addition, during application, it is necessary to conduct a pipeline connection check in advance to confirm that the connection between the working fluid inlet 15 and the post-filter of the clay bed is correct and secure, the connection between the cleaning water inlet 14 and the external water source pipeline is correct, the working fluid outlet 2 is connected to the regenerated liquid storage tank pipeline, and the cleaning water outlet 3 is connected to the sewage treatment system pipeline.
[0049] In summary, the following effects can be achieved by utilizing the above-described technical solution of this utility model:
[0050] 1. This invention efficiently removes alumina powder. The working fluid and cleaning water come into countercurrent contact at the composite sieve plate 6, allowing the alumina powder carried in the working fluid to be effectively washed away by the cleaning water. The composite sieve plate 6 consists of at least five layers arranged in a vertical array, increasing the contact area and time between the two phases, thus improving washing efficiency. This allows a large amount of alumina powder in the working fluid to be carried away by the cleaning water and discharged through the cleaning water outlet 3, thereby reducing the alumina powder content entering subsequent processes and avoiding its adverse effects on the activity of the hydrogenation catalyst.
[0051] 2. The excellent oil-water separation effect of this invention, through the synergistic action of the oil-water separation packing 10 and the coalescing dewatering filter element 12, enables efficient oil-water separation of the washed working fluid. The oil-water separation packing 10 initially separates the entrained water phase from the working fluid, while the coalescing dewatering filter element 12 further removes the remaining small water droplets, ensuring that the working fluid entering the regeneration liquid storage tank has extremely low water content, guaranteeing the quality of the working fluid, and facilitating the stable operation of subsequent production processes.
[0052] 3. This invention stabilizes the activity of the hydrogenation catalyst. Because it effectively removes alumina powder from the working solution, the hydrogenation catalyst is no longer negatively affected by alumina powder, and its activity can remain stable for a long time. This avoids frequent increases in the hydrogenation reaction temperature due to decreased catalyst activity, reduces anthraquinone degradation and consumption, and also reduces the consumption of active alumina from regenerated anthraquinone degradation products, extending the catalyst's lifespan and lowering production costs.
[0053] 4. This utility model facilitates observation and control. Several sight glasses 16 are installed between the cleaning water distribution pipe 4 and the working fluid distribution pipe 5, allowing operators to observe the flow status and contact conditions of the working fluid and cleaning water inside the equipment in real time. Based on the observed conditions, the flow rate, velocity, and other parameters of the working fluid and cleaning water can be adjusted in a timely manner to ensure that the equipment is in optimal operating condition and improve the washing, dust removal, and oil-water separation effects.
[0054] 5. This utility model prevents interference from liquid swirling. The anti-swirling cross plate 13 installed inside the cleaning water outlet 3 can effectively prevent swirling when the cleaning water is discharged. This avoids swirling from interfering with the normal flow of the working fluid and cleaning water inside the equipment, ensuring that the working fluid rises evenly and the cleaning water falls evenly within the equipment, maintaining a stable countercurrent contact process, and ensuring the stability of the washing and separation effect.
[0055] 6. This utility model saves on equipment investment costs. By using this water-washing dust collector in the hydrogen peroxide production process, the secondary fine filter used to remove alumina powder in the original process can be eliminated. This saves on the investment cost of the secondary filter, as well as the cost of replacing filter elements during normal production. Furthermore, because the catalyst activity is stable, there is no need to consider adding multiple catalysts or using a dual-tower series process, reducing the investment costs of a hydrogenation tower, two intermediate hydrogenation pumps, one intermediate hydrogenation cooler, two intermediate hydrogenation filters, and corresponding valves and pipelines, thus lowering the overall equipment investment cost.
[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production, characterized in that, include: A cylindrical body (1) is provided with a working fluid outlet (2) at the top end of the cylindrical body (1) and a cleaning water outlet (3) at the bottom end of the cylindrical body (1). A cleaning water distribution pipe (4) and a working fluid distribution pipe (5) are provided inside the cylindrical body (1). The working fluid distribution pipe (5) is located below the cleaning water distribution pipe (4). Several layers of composite sieve plates (6) are provided between the cleaning water distribution pipe (4) and the working fluid distribution pipe (5). The composite sieve plates (6) are connected to a downcomer (7). The top of the cleaning water distribution pipe (4) is provided with a support grid plate (8) and a pressure plate (9) in sequence. Oil-water separation packing (10) is provided between the support grid plate (8) and the pressure plate (9). The top of the pressure plate (9) is provided with a coalescing dewatering filter element (12). A water collection tank (11) is provided outside the coalescing dewatering filter element (12).
2. The protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production according to claim 1, characterized in that, The cleaning water outlet (3) is equipped with an anti-rotation cross plate (13).
3. The protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production according to claim 1, characterized in that, The cleaning water distribution pipe (4) is equipped with a cleaning water inlet (14).
4. The protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production according to claim 3, characterized in that, The working fluid distribution pipe (5) is provided with a working fluid inlet (15).
5. The protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production according to claim 1, characterized in that, Several sight glasses (16) are provided between the cleaning water distribution pipe (4) and the working fluid distribution pipe (5).
6. The protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production according to claim 1, characterized in that, The composite sieve plate (6) has at least five layers, and the five layers of the composite sieve plate (6) are arranged in a vertical array.
7. The protective hydrogenated catalyst activated water scrubbing dust collector for hydrogen peroxide production according to claim 1, characterized in that, The pressure plate (9) is provided with a perforated plate at the top, the coalescing dewatering filter element (12) is provided inside the perforated plate, and the water collection tank (11) is arranged in a ring outside the perforated plate.