Device for monitoring and regulating activity of hydrogen peroxide production catalyst in real time

Abstract

The utility model provides a hydrogen peroxide production catalyst activity real-time monitoring and regulating device which comprises a hydrogenation tower, the outer side face of the hydrogenation tower is fixedly connected with a liquid conveying pipe, the liquid conveying pipe is communicated with an outer liquid distribution pipe in a regulating assembly, the inner side face of the outer liquid distribution pipe is fixedly connected with an inner liquid distribution pipe through a middle liquid distribution pipe, and the lower surface of the middle liquid distribution pipe is symmetrically connected with spray heads. The upper surface of the middle liquid distribution pipe is fixedly connected with an optical fiber probe, and the temperature measuring assemblies are symmetrically connected into the fixed bed layer and composed of an upper fixing plate, a lower fixing plate, an outer protective shell, a middle protective shell, an inner protective shell and a temperature sensor. Through cooperation of the regulation and control assembly, the temperature measurement assembly and the optical fiber probe, the device can correspondingly monitor a working solution and a fixed bed layer in the hydrogenation tower in real time, so that accurate data of the activity of a catalyst in the fixed bed layer can be obtained, the sensitivity of regulation and control of the activity of the catalyst can be improved, and the working efficiency is improved. The production efficiency of hydrogen peroxide is improved.

Description

Technical Field

[0001] This utility model relates to the field of catalyst technology, specifically to a device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst. Background Technology

[0002] Hydrogen peroxide (H2O2), also known as hydrogen peroxide solution, is an important chemical product. It is widely used in papermaking, textiles, chemical synthesis, military industry, electronics, food processing, pharmaceuticals, environmental protection, and metallurgy. The main production methods for hydrogen peroxide include electrolysis, the anthraquinone method, the isopropanol method, and direct hydrogen-oxygen synthesis. The anthraquinone method is the most commonly used. It involves dissolving diethylanthraquinone in an organic solvent to form a working solution. Using diethylanthraquinone as a working carrier, hydrogen is added under the action of a palladium catalyst, reducing diethylanthraquinone to hydrogen anthraquinone. Then, oxygen from compressed air is used for oxidation to obtain the original diethylanthraquinone, simultaneously generating hydrogen peroxide. This is then further processed... Extraction, purification, and concentration yield hydrogen peroxide aqueous solutions of various specifications. However, in the anthraquinone process for producing hydrogen peroxide, the palladium catalyst is a key factor limiting production capacity. Various adverse factors often lead to palladium catalyst poisoning and reduced activity, causing its performance to fail to meet production requirements. Existing real-time monitoring and control devices for the catalyst are not convenient to install and remove, and the monitoring sensors lack adequate protection after installation, making them susceptible to accidental damage or contamination, thus reducing the accuracy of real-time monitoring. This, in turn, leads to a decrease in catalyst activity and consequently reduces hydrogen peroxide production efficiency. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst is provided to solve the problems mentioned in the background.

[0004] To achieve the above objectives, a device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst is provided, comprising: a hydrogenation tower, wherein a gas distributor, a control component, a fixed bed, and a liquid redistributor are fixedly connected inside the hydrogenation tower; a liquid delivery pipe is fixedly connected to the outer side of the hydrogenation tower, and the liquid delivery pipe is connected to an outer liquid distribution pipe in the control component; an inner liquid distribution pipe is fixedly connected to the inner side of the outer liquid distribution pipe through a middle liquid distribution pipe; nozzles are symmetrically connected to the lower surface of the middle liquid distribution pipe; an optical fiber probe is fixedly connected to the upper surface of the middle liquid distribution pipe; and a temperature measuring component is symmetrically connected inside the fixed bed. The temperature measuring component consists of an upper fixed plate, a lower fixed plate, an outer protective shell, a middle protective shell, an inner protective shell, and a temperature sensor; the outer protective shell is fixedly connected to the inner side of both the upper and lower fixed plates; the inner protective shell is fixedly connected to the inner side of the outer protective shell through the middle protective shell; and a temperature sensor is fixedly connected to the inner cavity of the outer protective shell, the middle protective shell, and the inner protective shell.

[0005] Preferably, two sets of temperature measuring components are symmetrically arranged at the upper and lower ends inside the fixed bed, and both sets of temperature measuring components are fixedly connected to corresponding positions on the inner side of the hydrogenation tower. The gas distributor is located above the fixed bed, and the liquid redistributor is located below the fixed bed.

[0006] Preferably, both the upper fixing plate and the lower fixing plate are circular ring structures, and the axial section of the upper fixing plate is a convex shape, while the axial section of the lower fixing plate is a concave shape. At the same time, multiple sets of through holes are opened at equal intervals around the outer arc surface of the lower fixing plate, and the protruding part of the upper fixing plate is fixedly connected to the groove opened on the surface of the lower fixing plate by bolts.

[0007] Preferably, the inner sides of the upper and lower fixing plates are each fixedly connected to a set of outer protective shells through an extension portion. Both sets of outer protective shells are circular ring structures, and the axial section of the outer protective shell is a semi-circular ring structure. At the same time, multiple sets of temperature sensors are fixedly connected at equal intervals inside the outer protective shell, the middle protective shell, and the inner protective shell. The two ends of the middle protective shell are connected to the inner cavities of the outer protective shell and the inner protective shell through wiring grooves.

[0008] Preferably, three sets of intermediate protective shells are fixedly connected at equal intervals around the inner side of the outer protective shell, and the end of the intermediate protective shell away from the outer protective shell is fixedly connected to the inner protective shell. The inner protective shell has a circular ring structure, the end face of the intermediate protective shell has a semi-circular structure, and the axial section of the inner protective shell has a semi-circular ring structure.

[0009] Preferably, the external liquid distribution pipe has a circular annular structure, the axial section of the external liquid distribution pipe has a U-shaped structure, and the external liquid distribution pipe is fixedly connected to the inner side of the hydrogenation tower, while the control component is located above the fixed bed.

[0010] Preferably, multiple sets of intermediate distribution tubes are fixedly connected around the inner arc surface of the outer distribution tube at equal intervals along the circumference, and the intermediate distribution tubes have a square cylindrical structure. The inner distribution tubes fixedly connected to the intermediate distribution tubes have a circular annular structure. At the same time, multiple sets of nozzles are fixedly connected parallel to each other at equal intervals along the length direction on the lower surface of the intermediate distribution tubes, and two sets of fiber optic probes are symmetrically distributed on the upper surface of the intermediate distribution tubes on both sides of the inner distribution tubes.

[0011] Compared with existing technologies, the beneficial effects of this invention are as follows: Through the combination of temperature measuring components and fiber optic probes, the device can monitor temperature changes at the edge, middle, and interior of the fixed bed in real time, and also monitor the near-infrared spectrum of the working liquid in the hydrogenation tower in real time. This improves the accuracy of real-time monitoring of catalyst activity, facilitating timely adjustment of catalyst activity. Furthermore, temperature sensors can be conveniently installed in batches inside the fixed bed, improving worker efficiency. The outer, middle, and inner protective shells effectively enhance the protection of the temperature sensors, reducing the likelihood of accidental damage or contamination. Simultaneously, the combination of the infusion pipe and control components ensures that the control solvent is uniformly and comprehensively injected near the catalyst, improving the efficiency of catalyst activity control and thus contributing to increased hydrogen peroxide production efficiency. Attached Figure Description

[0012] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model.

[0013] Figure 2 This is a top view schematic diagram of the control component according to an embodiment of the present utility model.

[0014] Figure 3 This is a top view schematic diagram of the temperature measuring component according to an embodiment of the present utility model.

[0015] Figure 4 This is an embodiment of the present utility model. Figure 1 Enlarged diagram of point A.

[0016] Figure 5 This is an embodiment of the present utility model. Figure 4 Enlarged diagram of point B.

[0017] In the diagram: 1. Hydrogenation tower; 2. Gas distributor; 3. Control unit; 4. Temperature measuring unit; 5. Fixed bed; 6. Liquid redistributor; 7. Infusion pipe; 8. Middle distribution pipe; 9. Outer distribution pipe; 10. Upper fixed plate; 11. Lower fixed plate; 12. Outer protective shell; 13. Temperature sensor; 14. Middle protective shell; 15. Inner protective shell; 16. Fiber optic probe; 17. Inner distribution pipe. Detailed Implementation

[0018] Reference Figures 1 to 5As shown, this utility model provides a real-time monitoring and control device for the activity of hydrogen peroxide production catalyst, comprising: a hydrogenation tower 1, a gas distributor 2, a control component 3, a fixed bed 5, and a liquid redistributor 6 fixedly connected inside the hydrogenation tower 1; a liquid delivery pipe 7 fixedly connected to the outer side of the hydrogenation tower 1, the liquid delivery pipe 7 being connected to an outer liquid distribution pipe 9 in the control component 3; and an inner liquid distribution pipe 17 fixedly connected to the inner side of the outer liquid distribution pipe 9 via a middle liquid distribution pipe 8; nozzles symmetrically connected to the lower surface of the middle liquid distribution pipe 8; and light fixedly connected to the upper surface of the middle liquid distribution pipe 8. The fiber probe 16 and the temperature measuring component 4 are symmetrically connected in the fixed bed 5. The temperature measuring component 4 consists of an upper fixed plate 10, a lower fixed plate 11, an outer protective shell 12, a middle protective shell 14, an inner protective shell 15 and a temperature sensor 13. The inner sides of the upper fixed plate 10 and the lower fixed plate 11 are fixedly connected to the outer protective shell 12. The inner side of the outer protective shell 12 is fixedly connected to the inner protective shell 15 through the middle protective shell 14. At the same time, the inner cavities of the outer protective shell 12, the middle protective shell 14 and the inner protective shell 15 are all fixedly connected to the temperature sensor 13.

[0019] In this embodiment, the working fluid flows from top to bottom within the hydrogenation tower 1, while hydrogen gas flows from bottom to top. The gas distributor 2 and liquid redistributor 6 enhance the uniformity of the working fluid and hydrogen gas flow within the hydrogenation tower 1, thereby improving the gas-liquid contact effect. Simultaneously, the fixed bed 5 inside the hydrogenation tower 1 is filled with a palladium catalyst, ensuring successful hydrogen peroxide production after gas-liquid contact. Multiple temperature sensors 13 in the temperature sensing component 4 monitor the temperature changes at the upper and lower edges, the middle, and the interior of the fixed bed 5 in real time, tracking the axial and radial temperature differences. The temperature data is transmitted by the temperature sensors 13 to an electrically connected external control system (not shown in the figure). When the local temperature exceeds 65°C, the external... The control system will automatically alarm, and the high-temperature and high-pressure resistant sterile fiber optic probes 16 symmetrically arranged on the upper surface of the control component 3 can transmit the corresponding data of the working solution to an electrically connected external near-infrared spectrometer (not shown in the figure) to achieve online spectral monitoring, thereby detecting the concentration of anthraquinone in the working solution in real time. When the concentration is lower than the design value (e.g., 80%), the alarm system is triggered. After the alarm is triggered, the external control system can inject pH adjuster (e.g., potassium carbonate solution) into the control component 3 through the infusion tube 7. The pH adjuster will be evenly sprayed on the upper surface of each fixed bed layer 5 through the nozzle set in the control component 3, which can maintain the pH value of the system at 7.5-8.5 to slow down palladium loss and improve the efficiency of control, ensuring that the activity of the palladium catalyst can be controlled within a suitable range.

[0020] In a preferred embodiment, two sets of temperature measuring components 4 are symmetrically arranged at the upper and lower ends inside the fixed bed 5, and the two sets of temperature measuring components 4 are fixedly connected to the corresponding positions on the inner side of the hydrogenation tower 1. The gas distributor 2 is located above the fixed bed 5, and the liquid redistributor 6 is located below the fixed bed 5.

[0021] In this embodiment, as Figure 1 and Figure 3 The temperature measuring component 4 enables real-time monitoring of multiple radial and axial temperatures within the fixed bed 5, thereby improving the accuracy of temperature change monitoring. Meanwhile, the positioning of the gas distributor 2 and the liquid redistributor 6 helps to enhance the gas-liquid contact effect.

[0022] In a preferred embodiment, both the upper fixing plate 10 and the lower fixing plate 11 are annular structures. The axial section of the upper fixing plate 10 is convex, while the axial section of the lower fixing plate 11 is concave. At the same time, multiple sets of through holes are opened at equal intervals around the outer arc surface of the lower fixing plate 11. The protrusion of the upper fixing plate 10 is fixedly connected to the groove opened on the surface of the lower fixing plate 11 by bolts.

[0023] In this embodiment, as Figure 3 , Figure 4 and Figure 5 The upper fixing plate 10 and the lower fixing plate 11 are connected by a tenon and mortise structure, which enables rapid assembly. The protrusion of the upper fixing plate 10 is provided with a screw hole corresponding to the through hole. After the bolt passes through the through hole of the lower fixing plate 11, it can be screwed into the screw hole provided in the upper fixing plate 10, thereby realizing the fixed connection between the upper fixing plate 10 and the lower fixing plate 11, and thus realizing the rapid assembly of the temperature measuring component 4.

[0024] In a preferred embodiment, the inner sides of the upper fixing plate 10 and the lower fixing plate 11 are each fixedly connected to a set of outer protective shells 12 through an extension portion. Both sets of outer protective shells 12 are annular structures, and the axial section of the outer protective shell 12 is a semi-circular annular structure. At the same time, multiple sets of temperature sensors 13 are fixedly connected at equal intervals inside the outer protective shell 12, the middle protective shell 14 and the inner protective shell 15. The two ends of the middle protective shell 14 are connected to the inner cavities of the outer protective shell 12 and the inner protective shell 15 through wiring grooves.

[0025] In this embodiment, as Figure 1 , Figure 3 and Figure 4A sealing layer is fixedly connected to the mating surfaces of the two sets of outer protective shells 12, the two sets of middle protective shells 14, and the two sets of inner protective shells 15. This effectively enhances the sealing performance of the temperature measuring component 4, reduces the probability of external substances such as working fluid interfering with the temperature sensor 13, and ensures the accuracy of the temperature sensor 13 monitoring data. At the same time, the overall structure of the temperature measuring component 4 allows multiple temperature sensors 13 to be quickly and conveniently deployed in different positions inside the fixed bed layer 5, thereby improving the loading and unloading efficiency of the device.

[0026] In a preferred embodiment, three sets of intermediate protective shells 14 are fixedly connected around the inner side of the outer protective shell 12 at equal intervals in the circumferential direction. The end of the intermediate protective shell 14 away from the outer protective shell 12 is fixedly connected to the inner protective shell 15. The inner protective shell 15 has a circular ring structure, and the end face of the intermediate protective shell 14 has a semi-circular structure, while the axial section of the inner protective shell 15 has a semi-circular ring structure.

[0027] In this embodiment, as Figure 1 , Figure 3 and Figure 4 The outer protective shell 12, the middle protective shell 14 and the inner protective shell 15 are all made of corresponding thermally conductive materials, which can help improve the monitoring effect of the temperature sensor 13. At the same time, the arc-shaped structure on the outer side of the outer protective shell 12, the middle protective shell 14 and the inner protective shell 15 can help reduce the degree of interference to the fluid inside the hydrogenation tower 1.

[0028] In a preferred embodiment, the external liquid distribution pipe 9 has a circular structure and a U-shaped cross section. The external liquid distribution pipe 9 is fixedly connected to the inner side of the hydrogenation tower 1, while the control component 3 is located above the fixed bed 5.

[0029] In this embodiment, as Figure 1 , Figure 2 and Figure 4 The structure and position of the external liquid distribution tube 9 facilitate the installation of the control component 3 and improve the adjustment efficiency of the pH adjuster on the catalyst inside the fixed bed 5, thereby increasing the speed of catalyst activity adjustment.

[0030] In a preferred embodiment, multiple sets of intermediate distribution pipes 8 are fixedly connected around the inner arc surface of the outer distribution pipe 9 at equal intervals in the circumferential direction, and the intermediate distribution pipes 8 have a square cylindrical structure. The inner distribution pipe 17 fixedly connected to the intermediate distribution pipes 8 has a circular structure. At the same time, multiple sets of nozzles are fixedly connected parallel to each other at equal intervals along the length direction on the lower surface of the intermediate distribution pipes 8, and two sets of fiber optic probes 16 are symmetrically distributed on the upper surface of the intermediate distribution pipes 8 on both sides of the inner distribution pipe 17.

[0031] In this embodiment, as Figure 1 , Figure 2 and Figure 4The combination of the outer liquid distribution pipe 9, the middle liquid distribution pipe 8, and the inner liquid distribution pipe 17 enhances the overall structural strength of the control component 3. The arc-shaped structure on the outer side of the middle liquid distribution pipe 8 and the inner liquid distribution pipe 17 reduces the interference effect of the control component 3 on the fluid. At the same time, the nozzle setting allows the pH adjuster to be sprayed evenly on the upper surface of each fixed bed layer 5, improving the efficiency of catalyst activity control inside the fixed bed layer 5.

[0032] This utility model's real-time monitoring and control device for hydrogen peroxide production catalyst activity, through the cooperation of control component 3, temperature measuring component 4, and fiber optic probe 16, enables the device to monitor the working liquid and fixed bed 5 in the hydrogenation tower 1 in real time, thereby obtaining accurate data on the catalyst activity in the fixed bed 5. This improves the sensitivity of catalyst activity control, increases hydrogen peroxide production efficiency, and enhances the convenience of loading and unloading the device. Furthermore, the control system, near-infrared spectrometer, fiber optic probe 16, and temperature sensor 13 all use suitable brands and models available on the market, and other components within the device are also made of suitable materials. Additionally, the infusion pipe 7 is connected to an external high-pressure water source.

Claims

1. A device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst, comprising: A hydrogenation tower (1) is provided, in which a gas distributor (2), a control assembly (3), a fixed bed (5), and a liquid redistributor (6) are fixedly connected respectively. The tower is characterized in that: a delivery pipe (7) is fixedly connected to the outer side of the hydrogenation tower (1), the delivery pipe (7) is connected to the outer liquid distribution pipe (9) in the control assembly (3), and the inner side of the outer liquid distribution pipe (9) is fixedly connected to the inner liquid distribution pipe (17) through a middle liquid distribution pipe (8). Spray nozzles are symmetrically connected to the lower surface of the middle liquid distribution pipe (8), and fiber optic probes (16) are fixedly connected to the upper surface of the middle liquid distribution pipe (8). Furthermore, temperature measuring components (4) are symmetrically connected to… The temperature measuring component (4) is attached to the fixed bed (5) and consists of an upper fixed plate (10), a lower fixed plate (11), an outer protective shell (12), a middle protective shell (14), an inner protective shell (15) and a temperature sensor (13). The inner sides of the upper fixed plate (10) and the lower fixed plate (11) are fixedly connected to the outer protective shell (12). The inner side of the outer protective shell (12) is fixedly connected to the inner protective shell (15) through the middle protective shell (14). At the same time, the inner cavities of the outer protective shell (12), the middle protective shell (14) and the inner protective shell (15) are all fixedly connected to the temperature sensor (13).

2. The device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst according to claim 1, characterized in that, Two sets of temperature measuring components (4) are symmetrically arranged at the upper and lower ends inside the fixed bed (5). Both sets of temperature measuring components (4) are fixedly connected to the corresponding positions on the inner side of the hydrogenation tower (1). The gas distributor (2) is located above the fixed bed (5), and the liquid redistributor (6) is located below the fixed bed (5).

3. The device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst according to claim 1, characterized in that, Both the upper fixing plate (10) and the lower fixing plate (11) are circular ring structures. The axial section of the upper fixing plate (10) is convex, while the axial section of the lower fixing plate (11) is concave. At the same time, multiple sets of through holes are opened at equal intervals around the outer arc surface of the lower fixing plate (11) in the circumferential direction. The protruding part of the upper fixing plate (10) is fixedly connected to the groove opened on the surface of the lower fixing plate (11) by bolts.

4. The device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst according to claim 1, characterized in that, The inner sides of the upper fixing plate (10) and the lower fixing plate (11) are each fixedly connected to a set of outer protective shells (12) through an extension portion. Both sets of outer protective shells (12) are circular ring structures, and the axial section of the outer protective shell (12) is a semi-circular ring structure. At the same time, multiple sets of temperature sensors (13) are fixedly connected at equal intervals inside the outer protective shell (12), the middle protective shell (14) and the inner protective shell (15). The two ends of the middle protective shell (14) are connected to the inner cavity of the outer protective shell (12) and the inner protective shell (15) through wiring grooves.

5. The device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst according to claim 1, characterized in that, The outer protective shell (12) has three sets of middle protective shells (14) fixedly connected around its inner side at equal intervals in the circumferential direction. The middle protective shell (14) is fixedly connected to the inner protective shell (15) at the end away from the outer protective shell (12). The inner protective shell (15) has a circular ring structure, and the end face of the middle protective shell (14) has a semi-circular structure. The axial section of the inner protective shell (15) has a semi-circular ring structure.

6. The device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst according to claim 1, characterized in that, The external liquid distribution pipe (9) has a circular structure and the axial section of the external liquid distribution pipe (9) has a U-shaped structure. The external liquid distribution pipe (9) is fixedly connected to the inner side of the hydrogenation tower (1), while the control component (3) is located above the fixed bed (5).

7. The device for real-time monitoring and control of the activity of hydrogen peroxide production catalyst according to claim 1, characterized in that, The outer liquid distribution tube (9) has multiple sets of middle liquid distribution tubes (8) fixedly connected around the inner arc surface at equal intervals in the circumferential direction. The middle liquid distribution tube (8) has a square cylindrical structure, while the inner liquid distribution tube (17) fixedly connected to the middle liquid distribution tube (8) has a circular structure. At the same time, multiple sets of nozzles are fixedly connected parallel to each other at equal intervals along the length direction on the lower surface of the middle liquid distribution tube (8), and two sets of fiber optic probes (16) are symmetrically distributed on the upper surface of the middle liquid distribution tube (8) on both sides of the inner liquid distribution tube (17).

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