Absorption device for pyromellitic acid production

Abstract

The utility model discloses an absorption device for pyromellitic acid production, which belongs to the technical field of pyromellitic acid production, and is characterized by comprising an absorption box, the rear side of the absorption box is fixedly connected with a storage box, the top of the storage box is provided with a pump body, the top of the absorption box is provided with a spraying mechanism, and the spraying mechanism is connected with the pump body. An air inlet mechanism is arranged in the absorption box, and a box cover is arranged at the top of the absorption box; the air inlet mechanism comprises a dispersion box, a plurality of dispersion holes and an air inlet pipe, and solves the problems that the existing part of structures for absorbing pyromellitic dianhydride generated during production of pyromellitic acid need to use various filter elements with special adsorption performance to realize efficient absorption, and the filter elements need to have broad-spectrum adsorbability, so that the production efficiency of pyromellitic dianhydride is influenced. The problems that in the prior art, an existing filter element is generally high in price, consumption of the filter element is large, cost is high, and the inner wall of an absorption structure is inconvenient to clean in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of pyromellitic acid production technology, and in particular to an absorption device for pyromellitic acid production. Background Technology

[0002] Pyromellitic acid, as a key organic chemical raw material, has a wide range of applications in many fields. Its production process generates tail gas containing various impurities. In order to meet environmental protection requirements and improve the utilization rate of raw materials, an efficient absorption device is indispensable. Pyromellitic acid is often prepared by the gas-phase oxidation method of pyromellitic acid. The tail gas generated in this process contains not only uncaptured pyromellitic acid dianhydride, but also oxidation byproducts. If not properly treated, it will cause harm to the environment and human health.

[0003] During the processing of pyromellitic dianhydride, the exhaust gas contains a large amount of organic gases. Organic exhaust gases are generally flammable and explosive, toxic and harmful, insoluble in water, soluble in organic solvents, and difficult to treat. Therefore, the exhaust gas needs to be treated before being discharged, otherwise it will pollute the air.

[0004] The existing patent (publication number: CN222286861U) discloses a device for filtering organic gases in the tail gas of pyromellitic dianhydride. The device uses an adsorption box and activated carbon to adsorb and filter the organic gases, and a combustion chamber and a burner to burn the organic gases. By treating the organic gases through both adsorption and combustion, the device can achieve better filtration results.

[0005] To address the aforementioned issues, existing patents have provided solutions. However, some existing structures for absorbing pyromellitic dianhydride generated during the production of pyromellitic dianhydride require various filter elements with special adsorption properties to achieve efficient absorption. These filter elements need to have broad-spectrum adsorption properties, and such filter elements are usually expensive, consume a lot of filter elements, have high costs, and are inconvenient to clean the inner wall of the absorption structure.

[0006] Therefore, an absorption device for the production of pyromellitic acid is proposed. Utility Model Content

[0007] The purpose of this invention is to provide an absorption device for the production of pyromellitic acid, which can solve the problem that some existing structures for absorbing pyromellitic dianhydride generated during the production of pyromellitic acid require various filter elements with special adsorption properties to achieve efficient absorption. These filter elements need to have broad-spectrum adsorption properties, but such filter elements are usually expensive, consume a lot of filter elements, have high costs, and are inconvenient to clean the inner wall of the absorption structure.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an absorption device for the production of pyromellitic acid, comprising an absorption box, a storage box fixedly connected to the rear side of the absorption box, a pump body provided on the top of the storage box, a spraying mechanism provided on the top of the absorption box, an air inlet mechanism provided inside the absorption box, and a box cover provided on the top of the absorption box.

[0009] The air intake mechanism includes a dispersion box, several dispersion holes, and an air intake pipe. The bottom of the dispersion box is fixedly connected to the bottom of the inner wall of the absorption box. The dispersion holes are opened inside the dispersion box. The rear side of the air intake pipe passes through the absorption box and is fixedly connected to the front side of the dispersion box.

[0010] Preferably, the spraying mechanism includes an elastic hose, a fixed pipe, and several nozzles. The top of the fixed pipe is fixedly connected to the top of the inner wall of the box cover, the top of the nozzles is fixedly connected to the bottom of the fixed pipe, and the side of the elastic hose near the box cover passes through the box cover and is fixedly connected to the top of the fixed pipe.

[0011] Preferably, the side of the flexible hose near the pump body output end is fixedly connected to the pump body output end, and the bottom of the pump body input end passes through the storage tank and extends into the interior of the storage tank.

[0012] Preferably, the storage box is provided with a cover on the top, and the cover has two pressure-balancing holes inside, which are symmetrically distributed inside the cover. A viewing window is embedded on the left side of the storage box.

[0013] Preferably, an overflow pipe is fixedly connected to the left side of the absorption box, a fixing frame is fixedly connected to the inner wall of the overflow pipe, a sliding rod is slidably connected inside the fixing frame, a block is fixedly connected to the left side of the sliding rod, and the surface of the block is in contact with the inner wall of the overflow pipe.

[0014] Preferably, a tension spring is movably sleeved on the surface of the slide rod, the left side of the tension spring is fixedly connected to the right side of the block, and the right side of the tension spring is fixedly connected to the left side of the fixing frame.

[0015] Preferably, connecting blocks are fixedly connected to both sides of the bottom of the box cover, and limit buttons are provided on opposite sides of the two connecting blocks. The side of the limit button near the connecting block passes through the connecting block and extends into the interior of the absorption box. The surface of the limit button is threadedly connected to the interior of the connecting block. Handles are fixedly connected to both sides of the top of the box cover, and an exhaust pipe is fixedly connected to the top of the box cover. Water-blocking cotton is fixedly connected to the inner wall of the exhaust pipe.

[0016] Preferably, a discharge pipe is fixedly connected to the left side of the absorption box, and a valve is installed inside the discharge pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. By setting up an air intake mechanism, this application allows the pyromellitic dianhydride tail gas to be evenly discharged through the dispersion holes into the water inside the absorption tank for tumbling. Since pyromellitic dianhydride hydrolyzes to generate pyromellitic acid when it comes into contact with water, and is partially soluble in water, the pyromellitic dianhydride and other soluble harmful substances in the tail gas tumbling in the water are absorbed by the water, and then the pyromellitic dianhydride tail gas continues to rise.

[0019] 2. This application incorporates a spray mechanism. After the pyromellitic dianhydride tail gas continues to rise, the main body is controlled by an external controller to spray water from the nozzles. This process absorbs water-soluble harmful substances in the pyromellitic dianhydride tail gas again. Subsequently, external equipment filters out the harmful substances in the pyromellitic dianhydride tail gas that are not soluble in water before discharging. This water absorption method significantly reduces the amount of filter cartridges used, thereby greatly reducing costs. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the absorption device for producing pyromellitic tetracarboxylic acid according to this utility model.

[0021] Figure 2 This is a three-dimensional connection diagram of the air inlet pipe and the absorption box in this utility model;

[0022] Figure 3 This is a three-dimensional structural diagram of the bottom of the box cover of this utility model;

[0023] Figure 4 This is a three-dimensional connection diagram of the air intake mechanism in this utility model;

[0024] Figure 5 This is a three-dimensional sectional view of the overflow pipe in this utility model;

[0025] Figure 6 This utility model Figure 2 A magnified view of a portion of point A in the middle.

[0026] In the diagram, 1. Absorption box; 2. Air intake mechanism; 201. Dispersion box; 202. Dispersion hole; 203. Air intake pipe; 3. Discharge pipe; 4. Overflow pipe; 5. Viewing window; 6. Cover; 7. Pump body; 8. Spraying mechanism; 801. Flexible hose; 802. Fixed pipe; 803. Sprayer head; 9. Handle; 10. Exhaust pipe; 11. Box cover; 12. Limit button; 13. Block; 14. Tension spring; 15. Fixing frame; 16. Slide rod; 17. Valve; 18. Storage box; 19. Pressure balancing hole; 20. Water-blocking cotton; 21. Connecting block. Detailed Implementation

[0027] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-6 The present invention provides the following technical solution:

[0029] An absorption device for the production of pyromellitic acid includes an absorption box 1, a storage box 18 fixedly connected to the rear side of the absorption box 1, a pump body 7 installed on the top of the storage box 18, a spraying mechanism 8 installed on the top of the absorption box 1, an air inlet mechanism 2 installed inside the absorption box 1, and a box cover 11 installed on the top of the absorption box 1.

[0030] The air intake mechanism 2 includes a dispersion box 201, several dispersion holes 202 and an air intake pipe 203. The bottom of the dispersion box 201 is fixedly connected to the bottom of the inner wall of the absorption box 1. The dispersion holes 202 are opened inside the dispersion box 201. The rear side of the air intake pipe 203 passes through the absorption box 1 and is fixedly connected to the front side of the dispersion box 201.

[0031] In this embodiment: After pre-filling the absorption tank 1 and storage tank 18 with water, the pyromellitic dianhydride tail gas is connected to the air inlet pipe 203. It is dispersed into a fine airflow through the dispersion box 201 and several dispersion holes 202, tumbling in the water at the bottom of the absorption tank 1. The pyromellitic dianhydride hydrolyzes and partially dissolves upon contact with water, and along with other soluble harmful substances, is initially absorbed and purified by the water. Then, the pump body 7 is started via an external controller, and the water in the storage tank 18 is sprayed out from the nozzle 803 through the elastic hose 801 and the fixed pipe 802, providing a secondary rinse to the rising gas and further removing residual impurities. When the gas passes through the exhaust pipe 10, the water-blocking cotton 20 blocks the water mist, and the purified gas is discharged. Harmful substances that are difficult to dissolve in water are subsequently processed by external equipment. As the nozzle 803 continues to spray water, the water level in the absorption tank 1 rises, and the water pressure pushes the plug 13 to open the overflow pipe 4, discharging the excess water. Measure water to ensure space for gas to rise. Open valve 17 on the discharge pipe 3 to drain the water rich in pollutants for water replacement. Compared to using multiple filter cartridges, this device uses water as the absorbent, which is low-cost and recyclable. Only a single harmful substance filter cartridge is needed for subsequent filtration, reducing the number of filter cartridges used and greatly reducing costs. Opening the cover 11 facilitates cleaning the inner wall. The exhaust gas is efficiently purified through water dissolution and spraying. It has a simple structure and is environmentally friendly and economical. It solves the problem of absorbing pyromellitic dianhydride produced during the production of some pyromellitic dianhydrides. To achieve efficient absorption, multiple filter cartridges with special adsorption properties are required. These filter cartridges need to have broad-spectrum adsorption properties. However, these filter cartridges are usually expensive and consume a lot of filter cartridges, resulting in high costs. Furthermore, it is inconvenient to clean the inner wall of the absorption structure.

[0032] Specifically, such as Figure 3 As shown, the spraying mechanism 8 includes an elastic hose 801, a fixed pipe 802 and several nozzles 803. The top of the fixed pipe 802 is fixedly connected to the top of the inner wall of the box cover 11, and the top of the nozzles 803 is fixedly connected to the bottom of the fixed pipe 802. The side of the elastic hose 801 near the box cover 11 passes through the box cover 11 and is fixedly connected to the top of the fixed pipe 802.

[0033] Specifically, such as Figure 1 As shown, the side of the flexible hose 801 near the output end of the pump body 7 is fixedly connected to the output end of the pump body 7, and the bottom of the input end of the pump body 7 passes through the storage tank 18 and extends into the interior of the storage tank 18.

[0034] Specifically, such as Figure 6 As shown, the top of the storage box 18 is provided with a cover 6, and the inside of the cover 6 is provided with two pressure-balancing holes 19, which are symmetrically distributed inside the cover 6. A viewing window 5 is embedded on the left side of the storage box 18.

[0035] In this embodiment: the pump body 7 is controlled by an external controller, so that the nozzle 803 can draw water from the storage tank 18 and spray it into the absorption tank 1. The storage tank 18 can be easily opened and water added by rotating the cover 6. The pressure balancing hole 19 inside the cover 6 helps to maintain the pressure balance inside and outside the storage tank 18, which makes it easy for the pump body 7 to draw water from the storage tank 18. It can be determined whether water needs to be added to the storage tank 18 through the viewing window 5.

[0036] Specifically, such as Figure 1 and Figure 5 As shown, an overflow pipe 4 is fixedly connected to the left side of the absorption tank 1. A fixing frame 15 is fixedly connected to the inner wall of the overflow pipe 4. A sliding rod 16 is slidably connected inside the fixing frame 15. A block 13 is fixedly connected to the left side of the sliding rod 16. The surface of the block 13 is in contact with the inner wall of the overflow pipe 4.

[0037] Specifically, such as Figure 5 As shown, a tension spring 14 is movably sleeved on the surface of the slide rod 16. The left side of the tension spring 14 is fixedly connected to the right side of the block 13, and the right side of the tension spring 14 is fixedly connected to the left side of the fixing frame 15.

[0038] In this embodiment: when the nozzle 803 continuously sprays water to raise the water level in the absorption tank 1, the water pressure pushes the block 13 to the left, overcoming the tension of the tension spring 14, so that the block 13 moves out of the overflow pipe 4, and the overflow pipe 4 can be opened to discharge excess water. The block 13 moves more stably by sliding the slide rod 16 inside the fixing frame 15, making it easier for the block 13 to be reset inside the overflow pipe 4.

[0039] Specifically, such as Figure 1 and Figure 3 As shown, connecting blocks 21 are fixedly connected to both sides of the bottom of the box cover 11. Limit buttons 12 are provided on opposite sides of the two connecting blocks 21. The side of the limit button 12 near the connecting block 21 passes through the connecting block 21 and extends into the interior of the absorption box 1. The surface of the limit button 12 is threadedly connected to the interior of the connecting block 21. Handles 9 are fixedly connected to both sides of the top of the box cover 11. An exhaust pipe 10 is fixedly connected to the top of the box cover 11. A water-blocking cotton 20 is fixedly connected to the inner wall of the exhaust pipe 10.

[0040] Specifically, such as Figure 1 As shown, a discharge pipe 3 is fixedly connected to the left side of the absorption box 1, and a valve 17 is installed inside the discharge pipe 3.

[0041] In this embodiment: the cover 11 is connected to the absorption box 1 via the connecting block 21 and the limiting button 12. The cover 11 can be easily removed by disassembling the limiting button 12, which makes it easy to clean the inside of the absorption box 1. The water inside the absorption box 1 can be easily discharged at once by opening the valve 17.

[0042] Working principle: Water is added to the absorption tank 1 and storage tank 18 beforehand. The pyromellitic dianhydride tail gas source is connected to the inlet pipe 203. The tail gas enters the dispersion box 201 through the inlet pipe 203 and is dispersed into a fine airflow through the dispersion holes 202, causing it to tumble in the water at the bottom of the absorption tank 1. Since pyromellitic dianhydride hydrolyzes in water to produce pyromellitic acid, which is partially soluble in water, the pyromellitic dianhydride and other soluble harmful substances are absorbed by the water in the tail gas tumbling in the water, achieving preliminary purification. At this time, the pump body 7 is controlled by an external controller to operate, and the storage... Water in tank 18 enters fixed pipe 802 through pump body 7 output end and flexible hose 801, and then sprays downward through nozzle 803 to wash the gas rising from the water, further absorbing residual harmful substances. As the gas continues to rise, water-blocking cotton 20 in exhaust pipe 10 blocks the water mist, allowing the purified gas to be discharged. Then, after filtering harmful substances in the pyromellitic dianhydride tail gas that cannot dissolve heavily in water through external equipment, it can be discharged. When nozzle 803 continuously sprays water, the water level in absorption tank 1 rises, and the water pressure pushes the block 13 to the left, overcoming the tension of tension spring 14. This allows the blockage 13 to be removed from the overflow pipe 4, enabling the overflow pipe 4 to open and drain excess water. This ensures sufficient space within the absorption tank 1 for gas to rise. When needed, the discharge pipe 3 at the bottom of the absorption tank 1 opens valve 17 to drain the water rich in contaminants from the absorption tank 1 at once, facilitating water replacement. Compared to existing filter cartridge filtration, this device uses water as the absorbent, resulting in significantly lower water costs compared to filter cartridges. Furthermore, water is recyclable, requiring only periodic drainage and replenishment. Only one external filtration device is needed to filter the pyromellitic dianhydride tail gas, greatly reducing the amount of filter cartridges used and significantly lowering consumable costs. Opening the lid 11 allows for easy cleaning of the inner wall of the absorption chamber 1, preventing contaminants from adhering and affecting the absorption effect. The entire process efficiently absorbs the pyromellitic dianhydride tail gas through water dissolution and spraying. The structure is simple, economical, and environmentally friendly. It solves the problem of existing structures for absorbing pyromellitic dianhydride generated during the production of some pyromellitic dianhydrides. To achieve efficient absorption, various filter elements with special adsorption properties are required. These filter elements need to have broad-spectrum adsorption properties, but such filter elements are usually expensive, consume a lot of filter elements, have high costs, and are inconvenient to clean the inner wall of the absorption structure.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements 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. An absorption device for the production of pyromellitic acid, comprising an absorption box (1), characterized in that: A storage box (18) is fixedly connected to the rear side of the absorption box (1). A pump body (7) is provided on the top of the storage box (18). A spraying mechanism (8) is provided on the top of the absorption box (1). An air intake mechanism (2) is provided inside the absorption box (1). A box cover (11) is provided on the top of the absorption box (1). The air intake mechanism (2) includes a dispersion box (201), a plurality of dispersion holes (202) and an air intake pipe (203). The bottom of the dispersion box (201) is fixedly connected to the bottom of the inner wall of the absorption box (1). The dispersion holes (202) are opened inside the dispersion box (201). The rear side of the air intake pipe (203) passes through the absorption box (1) and is fixedly connected to the front side of the dispersion box (201).

2. The absorption device for producing pyromellitic acid according to claim 1, characterized in that: The spraying mechanism (8) includes an elastic hose (801), a fixed pipe (802), and several nozzles (803). The top of the fixed pipe (802) is fixedly connected to the top of the inner wall of the box cover (11), and the top of the nozzles (803) is fixedly connected to the bottom of the fixed pipe (802). The side of the elastic hose (801) near the box cover (11) passes through the box cover (11) and is fixedly connected to the top of the fixed pipe (802).

3. The absorption device for producing pyromellitic acid according to claim 2, characterized in that: The side of the flexible hose (801) near the output end of the pump body (7) is fixedly connected to the output end of the pump body (7), and the bottom of the input end of the pump body (7) passes through the storage box (18) and extends into the interior of the storage box (18).

4. The absorption device for producing pyromellitic acid according to claim 1, characterized in that: The storage box (18) is provided with a cover (6) on the top. The cover (6) has two pressure-balancing holes (19) inside and they are symmetrically distributed inside the cover (6). The storage box (18) has a viewing window (5) on the left side.

5. The absorption device for producing pyromellitic acid according to claim 1, characterized in that: An overflow pipe (4) is fixedly connected to the left side of the absorption box (1). A fixing frame (15) is fixedly connected to the inner wall of the overflow pipe (4). A sliding rod (16) is slidably connected inside the fixing frame (15). A block (13) is fixedly connected to the left side of the sliding rod (16). The surface of the block (13) is in contact with the inner wall of the overflow pipe (4).

6. The absorption device for producing pyromellitic acid according to claim 5, characterized in that: A tension spring (14) is movably sleeved on the surface of the slide rod (16). The left side of the tension spring (14) is fixedly connected to the right side of the block (13), and the right side of the tension spring (14) is fixedly connected to the left side of the fixing frame (15).

7. The absorption device for producing pyromellitic acid according to claim 1, characterized in that: Both sides of the bottom of the box cover (11) are fixedly connected to connecting blocks (21). Each of the two connecting blocks (21) is provided with a limit button (12) on the opposite side. The side of the limit button (12) near the connecting block (21) passes through the connecting block (21) and extends into the interior of the absorption box (1). The surface of the limit button (12) is threadedly connected to the interior of the connecting block (21). Both sides of the top of the box cover (11) are fixedly connected to handles (9). The top of the box cover (11) is fixedly connected to an exhaust pipe (10). The inner wall of the exhaust pipe (10) is fixedly connected to a water-blocking cotton (20).

8. The absorption device for producing pyromellitic acid according to claim 1, characterized in that: The left side of the absorption box (1) is fixedly connected to a discharge pipe (3), and a valve (17) is installed inside the discharge pipe (3).

Images