Device for purifying waste gas generated in durene production

Abstract

The invention relates to the technical field of waste gas purification, in particular to a durene production waste gas purification device which comprises a spraying cabin, a heating cabin and a catalysis cabin, a spraying area a is arranged in the spraying cabin, a drying area b and a heating area c are arranged in the heating cabin, a catalysis area d is arranged in the catalysis cabin, the spraying area a comprises a second partition plate installed in the spraying cabin, and the second partition plate comprises a first partition plate installed in the spraying cabin. The top end of the second partition plate is fixedly connected with a plurality of first gas conveying pipes, waterproof caps are arranged at the top ends of the first gas conveying pipes, a through spraying pipe is arranged in the spraying cabin, multiple sets of nozzles are arranged at the bottom end of the part, located in the cabin, of the spraying pipe, and a first water inlet valve is arranged on the outer side part. In the scheme, through the whole-process layered treatment of spraying impurity removal, drying preheating and heating catalysis, and in combination with a water resource circulation system and an energy recovery mechanism (hot water and hot air are heated by waste heat), the unification of efficient purification of waste gas (the VOCS removal rate reaches 99% or above), energy conservation and environmental protection (the energy consumption is reduced by 40% or above) and operation and maintenance convenience is realized; and the technical pain point of a traditional device is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of waste gas purification technology, and in particular to a waste gas purification device for mesitylene production. Background Technology

[0002] The waste gas from mesitylene production is a mixed gas generated during the synthesis and purification of mesitylene, mainly containing mesitylene vapor (a volatile organic compound, i.e., VOC). S The mixture contains catalyst powder (such as molecular sieve catalyst particles), raw material impurities (such as methylbenzene derivatives), and a small amount of water vapor. It is characterized by complex composition, flammability and explosiveness, strong odor, and great harm to human health and the environment. Direct emission will cause air pollution and endanger the health of operators.

[0003] Traditional waste gas purification devices have several shortcomings: First, the treatment process is too simple, using only single adsorption (such as activated carbon adsorption) or combustion methods, making it difficult to remove dust impurities and VOCs simultaneously. S Firstly, it leads to incomplete purification and emissions easily exceeding standards; secondly, it has high energy consumption, as traditional combustion methods require heating the exhaust gas to over 800℃ to decompose VOCs. S First, energy waste is serious; second, the resource recycling rate is low, the direct discharge of spray wastewater causes water waste, and the waste heat of exhaust gas is not effectively utilized; third, maintenance is inconvenient, catalyst replacement is difficult, filter components are easily clogged and cleaning is cumbersome, affecting the continuous operation efficiency of the equipment.

[0004] Therefore, this invention proposes a waste gas purification device for mesitylene production. Through a multi-stage treatment process of "spraying for impurities removal → drying and preheating → heating and catalysis," combined with a water resource recycling system (three-stage filtration and reuse) and an energy recovery mechanism (waste heat heating hot water and hot air), it achieves highly efficient purification of waste gas (VOCs). S It achieves a removal rate of over 99%, energy saving and environmental protection (energy consumption reduced by over 40%), and convenient operation and maintenance, effectively solving the technical pain points of traditional devices. Summary of the Invention

[0005] Technical problems solved: Overcoming the challenges of a single process for treating mesitylene waste gas and high energy consumption for VOCs decomposition.

[0006] To address the shortcomings of existing technologies, this invention provides a waste gas purification device for mesitylene production, thereby solving the technical problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A waste gas purification device for the production of mesitylene includes a spray chamber, a heating chamber, and a catalytic chamber. The spray chamber is provided with a spray zone a, the heating chamber is provided with a drying zone b and a heating zone c, and the catalytic chamber is provided with a catalytic zone d. The spray zone a includes a partition two installed inside the spray chamber, with multiple air supply pipes fixed to the top of the partition two. The top of each air supply pipe is equipped with a waterproof cap. A through spray pipe is installed inside the spray chamber. Multiple sets of nozzles are installed at the bottom of the spray pipe located inside the chamber, and a water inlet valve is installed on the outer part. A drain pipe is installed on one side of the spray chamber. The inlet end of the drain pipe is located on the upper side of the partition two and does not exceed the top of the air supply pipe. A drain valve is installed in the middle of the drain pipe. The heating zone c includes four sets of air passage layers. Each set of air passage layers consists of two partitions fixedly connected in the heating chamber. Multiple gas supply pipes are installed between the two partitions in each set. Three combustion layers are formed between the four sets of air passage layers. Three sets of flame nozzles are installed in the middle of the heating chamber. The flame nozzles are connected to the gas pipeline through the gas pipe and are located in the middle of the combustion layer. The catalytic zone d includes two layers of catalytic blocks installed inside the catalytic chamber.

[0008] In one possible implementation, a water treatment zone a1 is provided on one side of the spray zone a. The water treatment zone a1 includes a water storage tank and a filter box. A water pump is installed between the water storage tank and the filter box. The filter box is connected to the spray pipe through a water pump. The outlet of the drain pipe is connected to the water storage tank.

[0009] In one possible implementation, a vacuum layer is formed between the two partitions of the air passage layer and the inner wall of the heating chamber and the outer wall of the air supply pipe. The vacuum layer is divided into a hot water chamber and a hot air chamber. An exhaust pipe is installed on the outside of the hot water chamber, and an inlet valve and a drain valve are installed at the upper and lower ends of the outside, respectively. A connecting pipe is installed on the outside of the hot water chamber.

[0010] In one possible implementation, the drying zone b includes multiple air supply pipes three, which are installed at the bottom of the heating chamber. An exhaust grille is installed on one side of the bottom of the heating chamber. A fan is installed on the left side of the hot air chamber and a hot air duct is installed on the right side. The hot air duct extends to the bottom of the heating chamber and communicates with the drying zone b.

[0011] In one possible implementation, the two catalyst blocks are respectively a noble metal catalyst and a non-noble metal oxide catalyst; the active components of the noble metal catalyst are platinum, palladium and rhodium, and the active components of the non-noble metal oxide catalyst are a composite system of transition metal oxides and rare earth oxides. Both types of catalysts are supported on the surface of a honeycomb ceramic support in the form of nanoscale particles.

[0012] In one possible implementation, a hatch is installed on the right side of the catalytic chamber.

[0013] Beneficial effects compared to existing technologies: 1. This scheme achieves high efficiency and thoroughness in waste gas purification through a multi-stage, end-to-end treatment design. The device follows a core pathway of "spraying → drying → heating → catalysis." First, the spraying zone removes dust and impurities such as catalyst powder and mesitylene solid particles from the waste gas, preventing blockages or efficiency reductions in subsequent stages. Then, the drying zone preheats and dehumidifies the gas, creating stable conditions for heating and catalysis. Finally, relying on the synergistic effect of the heating zone's temperature rise and the dual-layer catalyst (precious metal + non-precious metal oxide) in the catalytic zone, mesitylene (VOC) is purified. S At a low temperature of 250-350℃, it is completely oxidized into CO2 and H2O, which greatly improves the purification efficiency compared with traditional high temperature oxidation, and leaves no harmful residues, meeting the strict exhaust emission standards. 2. In this solution, the energy and water resource recycling design achieves energy-saving and environmentally friendly operation of the equipment. In terms of water resources, a water treatment area with three layers of filter media (quartz sand, activated carbon, and PP membrane) is set up to purify the spray wastewater and reuse it, so that the suspended solids content is ≤5mg / L and COD is ≤80mg / L, reducing the consumption of fresh water. In terms of energy, the waste heat of the exhaust gas in the heating zone is used to heat the air in the hot air chamber and the water in the hot water chamber. The hot air is used to preheat the exhaust gas in the drying zone to reduce energy consumption, and the hot water is used as domestic water in the plant area, forming an energy closed loop of "waste gas waste heat - hot air / hot water - production and domestic use", which significantly reduces the overall energy consumption and operating cost of the equipment and conforms to the concept of green production. 3. This solution achieves convenient operation and maintenance of the equipment through structural optimization and user-friendly design. Structurally, it adopts a vertical layout of "spray chamber (lower) → heating chamber (middle) → catalytic chamber (upper)," with clear exhaust gas channels. Key components (such as gas supply pipes and nozzles) are installed in an orderly manner according to functional zones, facilitating on-site installation and pipeline connection. In terms of operation, each link is equipped with independent control components (water inlet valve, drain valve, fan), and parameters can be flexibly adjusted according to the exhaust gas treatment volume. In terms of maintenance, the catalytic zone is equipped with a door for quick replacement of catalytic blocks, the filter box allows for regular cleaning of the filter media, and the gas supply pipe is made of 304 stainless steel, which is corrosion-resistant and easy to clean, reducing the difficulty of equipment maintenance and downtime, and improving the overall operational stability. Attached Figure Description

[0014] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the functional partitions of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the spray pipe of the present invention; Figure 4This is a schematic diagram of the spray water filtration zone of the present invention; Figure 5 This is a schematic diagram of the exhaust pipe of the present invention; Figure 6 This is a schematic diagram of the hot air duct of the present invention; Figure 7 This is a schematic diagram of the catalyst block of the present invention.

[0016] Legend: 1. Spray chamber; 2. Gas supply pipe one; 3. Waterproof cap; 4. Spray pipe; 5. Nozzle; 6. Water inlet valve one; 7. Drain pipe; 8. Drain valve one; 9. Water storage tank; 10. Water pump one; 11. Filter box; 12. Water pump two; 13. Heating chamber; 14. Gas supply pipe two; 15. Gas pipe; 16. Flame nozzle; 17. Water inlet valve two; 18. Exhaust pipe; 19. Connecting pipe; 20. Drain valve two; 21. Fan; 22. Hot air duct; 23. Gas supply pipe three; 24. Exhaust grille; 25. Catalytic converter chamber; 26. Catalytic block; 27. Door; 28. Combustion layer; 29. ​​Partition one; 30. Hot water chamber; 31. Hot air chamber; 32. Partition two. Detailed Implementation

[0017] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings. The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows: Example

[0018] Please refer to Figures 1 to 7 As shown in the figure, this embodiment introduces the specific structure of a waste gas purification device for mesitylene production, including a spray chamber 1, a heating chamber 13, and a catalytic chamber 25. The spray chamber 1 is provided with a spray zone a, the heating chamber 13 is provided with a drying zone b and a heating zone c, and the catalytic chamber 25 is provided with a catalytic zone d. Spray zone a is mainly used to remove dust pollutants such as catalyst powder, methylenetetramethylbenzene solid particles, and raw material impurities from the waste gas produced by mesitylene production, providing clean waste gas for subsequent drying, heating, and catalytic processes, and preventing impurities from clogging pipes or affecting catalytic efficiency; drying zone b is mainly used to remove water vapor from the waste gas after spraying, and at the same time, it uses waste heat to preheat the waste gas, preventing water vapor condensation from affecting the heating efficiency after the wet waste gas enters the heating zone, thus reducing the energy consumption of subsequent heating processes; heating zone c heats the preheated and dried waste gas to the required temperature for mesitylene (VOCs). SThe catalytic decomposition requires a temperature of 250-350℃, and the waste heat from the exhaust gas is recovered for heating hot water and hot air, achieving secondary energy utilization and reducing the overall energy consumption of the equipment; the catalytic zone d mainly operates at 250-350℃ to decompose mesitylene (VOCs) in the heated exhaust gas. S Complete oxidation and decomposition into harmless CO2 and H2O, achieving standard emissions of waste gas and VOCs. S The removal rate is over 99%.

[0019] A bottom-up waste gas channel is established through spray chamber 1, heating chamber 13, and catalytic chamber 25. Within this channel, spray zone a, drying zone b, heating zone c, and catalytic zone d are sequentially arranged, forming a complete treatment path for the waste gas including spraying, drying, heating, temperature control, and catalysis. The vertical layout of spray chamber 1, heating chamber 13, and catalytic chamber 25 is a "directional flow channel" designed according to the treatment requirements of mesitylene waste gas (a progressive logic of "impurity removal-dehumidification-heating-decomposition"). Although mesitylene production waste gas contains a small amount of dust and water vapor, its overall density is slightly lower than air. The bottom-up channel direction allows for the slight buoyancy of the waste gas itself to assist in its flow, reducing the energy consumption of additional ventilation equipment. The lowest spray chamber 1 contains a partition 32, multiple gas supply pipes 2, and a waterproof cap 3. The space is large enough to accommodate the atomizing spray system (spray pipe 4 + nozzle 5), and the bottom is reserved with enough area to collect wastewater containing impurities, which meets the requirement of "full gas-liquid contact" for "spraying to remove impurities"; the heating chamber 13 in the middle is divided into a drying zone b (bottom) and a heating zone c (middle). The drying zone b can accommodate multiple gas supply pipes 23, and the heating zone c can be equipped with four sets of air passage layers (partition 29 + gas supply pipe 14) and three sets of combustion layers 28. The space size is suitable for the requirements of "hot air surrounding" for "drying and preheating" and "layered temperature control" for "heating and temperature rise"; the catalytic chamber 25 at the top can stably place two layers of catalytic blocks 26 inside, and there is a door 27 on the right side, which not only ensures sufficient contact space between waste gas and catalyst, but also facilitates subsequent maintenance, which meets the requirement of "stable reaction environment" for "catalytic decomposition". Spray zone a includes a partition 32 installed inside spray chamber 1. Multiple gas supply pipes 2 are fixedly connected to the top of partition 32, and each gas supply pipe 2 has a waterproof cap 3 installed at its top. The waterproof cap 3 is shaped like an inverted bowl, made of corrosion-resistant material (suitable for the chemical properties of xylene waste gas), and has a diameter significantly larger than that of a single gas supply pipe 2. An annular gas discharge channel is left between the inner surface of the waterproof cap 3 and the edge of the top of the gas supply pipe 2. Because the nozzles 5 in the spray zone spray atomized water downwards, if the top of the gas supply pipe 2 is not obstructed, the water will flow directly into the hollow pipe of the gas supply pipe 2, and then backflow into the space below partition 32, contaminating the untreated waste gas, and potentially causing the entire spray zone to malfunction. The system is clogged; however, the waterproof cap 3, due to its larger diameter, can completely cover the top of the air supply pipe 2 like an "umbrella". After the water flows onto the outer surface of the waterproof cap 3, it will drip down along the edge of the cap and eventually collect in the space above the partition 32, preventing it from entering the air supply pipe 2. Similarly, although the waterproof cap 3 covers the top of the air supply pipe 2, the "annular gas discharge channel" reserved between the two allows the exhaust gas flowing upward in the air supply pipe 2 to be discharged smoothly. After the exhaust gas flows out from the top of the air supply pipe 2, it will diffuse along the channel to the outside of the waterproof cap 3 and eventually enter the spray area evenly, making full contact with the atomized water flow to remove impurities. This ensures that the exhaust gas is not trapped due to the obstruction of the waterproof cap 3 and also ensures the contact area between the exhaust gas and the water flow.

[0020] Spray pipe 4 is installed inside the spray chamber 1, and spray pipe 4 runs through the spray chamber 1. Multiple nozzles 5 are installed at the bottom of the part inside the spray chamber 1, and water inlet valve 6 is installed on the outer part. When spraying, water inlet valve 6 is opened first, and spray water enters from the spray pipe 4 and is sprayed out by the nozzles 5. Then, exhaust gas enters from multiple gas supply pipes 2 and is discharged through the gas discharge channel between the gas supply pipes 2 and the waterproof cap 3. At this time, the spray water sprayed from the nozzles 5 is fully mixed with the exhaust gas, which can remove dust such as catalyst powder, mesitylene solid particles, and raw material impurities in the exhaust gas.

[0021] A drain pipe 7 is installed on one side of the spray chamber 1. The inlet end of the drain pipe 7 is located on the upper side of the partition 2 32 and does not exceed the top of the air supply pipe 2. A drain valve 8 is installed in the middle of the drain pipe 7. When in use, the drain valve 8 is opened. After the spray water treats the exhaust gas, it falls on the top of the waterproof cap 3. Because the diameter of the waterproof cap 3 is larger than that of the air supply pipe 2, the water flow will be diverted to the surrounding area of ​​the air supply pipe 2 and will not fall into the bottom of the partition 2 32 through the air supply pipe 2. The spray water falling on the waterproof cap 3 is collected on the partition 2 32 and finally flows out from the drain pipe 7. After the exhaust gas enters from the bottom of the spray chamber 1, it must first flow upward through the gas supply pipe 2, while the nozzle 5 atomizes and sprays water downward from the spray pipe 4, forming a reverse contact of "exhaust gas upward and water downward," maximizing the gas-liquid contact area and ensuring that dust is fully captured. If impurities are not removed first, these dust particles will enter the subsequent gas supply pipe 23 and gas supply pipe 14 with the exhaust gas, causing pipe blockage, or adhere to the surface of the catalyst block 26, covering the active sites and reducing catalytic efficiency.

[0022] One side of the spray zone a also includes a water treatment zone a1 for treating the spray water. The water treatment zone a1 includes a water storage tank 9. The output end of the drain pipe 7 is connected to the water storage tank 9. The polluted spray water flows into the water storage tank 9 through the drain pipe 7. A filter box 11 is installed at the top of the water storage tank 9. The filter box 11 is filled with three layers of filter media, from right to left: quartz sand (coarse filtration to remove large particulate impurities), activated carbon (adsorb organic pollutants), and PP filter membrane (fine filtration of fine suspended solids). This ensures that the suspended solids content of the spray wastewater after purification is ≤5mg / L and COD≤80mg / L, meeting the secondary spray water quality requirements. A water pump 10 is installed on one side of the filter box 11. The input end of the water pump 10 is connected to the bottom of the water storage tank 9, and the output end is connected to the right side of the filter box 11. A water pump 2 12 is installed on the left side of the filter box 11. The input end of the water pump 2 12 is connected to the left side of the filter box 11, and the output end is connected to the spray pipe 4. The spray water in the water storage tank 9 is pumped into the filter box 11 by the water pump 10. After purification, it becomes spray water that can be reused. It is then pumped out by the water pump 2 12 and sprayed through the nozzle 5 to realize the recycling of water resources.

[0023] Heating zone c includes four sets of air passage layers. Each set of air passage layers consists of two partitions 29 fixed inside the heating chamber 13. Multiple air supply pipes 14 are installed between the two partitions 29 in each set. Three combustion layers 28 are formed between the four sets of air passage layers. Exhaust gas can pass through the air passage layers and enter the combustion layers 28 through the air supply pipes 14. A vacuum layer is formed between the two partitions 29 in each set of air passage layers, the inner wall of the heating chamber 13, and the outer wall of the air supply pipes 14. The vacuum layer is divided into a hot water chamber 30 and a hot air chamber 31. The specific number can be set according to the requirements. Figure 6 In the middle, a hot air chamber 31 is located at the top, and two hot water chambers 30 are located below the hot air chamber 31.

[0024] Three sets of flame nozzles 16 are installed in the middle of the heating chamber 13. The three sets of flame nozzles 16 are connected to the gas pipeline through the gas pipe 15 and are respectively set in the middle of the three combustion layers 28. They can spray flames to both sides to provide a heat source for heating the exhaust gas.

[0025] An exhaust pipe 18 is fixedly connected to the outside of the hot water chamber 30. The exhaust pipe 18 is fixed to the outside of the hot water chamber 30 in the heating zone c and is connected to the hot water chamber 30. Its core function is to balance the air pressure inside the hot water chamber 30. When the waste heat from the exhaust gas in heating zone c heats the water in the hot water chamber 30, the water may generate a small amount of water vapor, or the air pressure inside the chamber may fluctuate due to changes in water temperature. The exhaust pipe 18 can promptly discharge this water vapor or excess gas to prevent excessive air pressure inside the hot water chamber 30 from affecting the safe operation of the equipment. At the same time, it ensures smooth circulation of the water inside the chamber and ensures stable waste heat heating efficiency. Water inlet valve 17 and drain valve 20 are installed on the upper and lower sides of the outer side of the hot water chamber 30, respectively. Water inlet valve 17 is used to add water to the hot water chamber 30, and drain valve 20 is used to drain water. The hot water chamber 30 in heating zone c is originally a continuous space, but because the burner nozzle 16 needs to be installed in the middle of the combustion layer 28 through the gas pipe 15, the gas pipe 15 will run horizontally through the hot water chamber 30, dividing it into two unconnected left and right parts. If this is not addressed, the water in the two hot water chambers 30 cannot circulate, resulting in one side being heated sufficiently and the other side being underheated. The connecting pipe 19 is installed on the outside of the hot water chamber 30, with its two ends connected to the two hot water chambers 30 separated by the gas pipe 15, forming a connecting channel so that the water on both sides can flow to each other. This ensures that the water in the entire hot water chamber 30 is evenly contacted by the waste heat from the exhaust gas transmitted by the gas pipe 14, achieving overall circulation heating and avoiding uneven local water temperature from affecting the waste heat utilization efficiency.

[0026] Water is added to the hot water chamber 30 through the inlet valve 217. The heated exhaust gas heats the water in the hot water chamber 30 through the gas transmission pipe 214. The heated hot water can be discharged from the drain valve 220 and used as domestic water in the factory area, realizing the recovery and utilization of waste heat from the exhaust gas.

[0027] Drying zone b includes air supply pipes 23 installed at the bottom of heating chamber 13. They are evenly distributed at equal intervals at the bottom of heating chamber 13, ensuring that exhaust gas passes through evenly and is fully preheated.

[0028] An exhaust grille 24 is installed on one side of the bottom of the heating chamber 13. A fan 21 is installed on the left side of the hot air chamber 31, and a hot air duct 22 is installed on the right side. The hot air duct 22 extends to the bottom of the heating chamber 13 and is connected to the drying area b.

[0029] When drying and heating the exhaust gas, the wet exhaust gas, after being sprayed, is discharged from the top of the spray chamber 1 and directly enters the air supply pipe 23 at the bottom of the heating chamber 13. The waste heat generated in the heating zone c heats the air in the hot air chamber 31. The hot air is transported to the drying zone b through the hot air duct 22 and flows around the air supply pipe 23. This structure of "exhaust gas inside the pipe and hot air outside the pipe" can quickly remove water vapor from the exhaust gas (avoiding water vapor from condensing upon entering the heating zone and affecting the heating efficiency of the air supply pipe 14). At the same time, it preheats the exhaust gas, reducing the energy consumption required for the subsequent heating zone c to raise the exhaust gas temperature to 250-350℃. The air supply pipes 23 are evenly distributed to ensure that the exhaust gas in each pipe can be evenly heated by the hot air. The exhaust grille 24 discharges excess hot air in time to avoid excessive pressure in the heating chamber 13 and ensure the stability of the upward flow of exhaust gas. The preheated exhaust gas enters the gas passing layer of heating zone c from the gas transmission pipe 23 upwards. The four gas passing layers are transported in layers through the gas transmission pipe 14. In the combustion layer 28 between each gas passing layer, the flame nozzle 16 (supplying gas through the gas pipe 15) can precisely control the flame intensity to ensure that the exhaust gas in each layer can be heated to the target temperature. This "layered heating" design avoids the uneven exhaust gas temperature caused by single-layer heating (some exhaust gas does not reach the catalytic temperature, and some is overheated, wasting energy) and achieves "precise temperature control". The partition 29 separates the gas passing layer and the combustion layer to ensure that the heat is concentrated around the combustion layer. The vacuum layer (hot water chamber 30 below and hot air chamber 31 above) reduces the heat loss of the heating chamber 13 and can recover the waste heat of the exhaust gas (heating hot water for use in the plant area and heating hot air for use in the drying area), further reducing energy consumption and matching the "from bottom to top" channel direction (waste heat is transferred from bottom to top, prioritizing the heating of the lower hot water chamber and then the heating of the upper hot air chamber).

[0030] The catalytic chamber 25 contains a catalytic block 26, which consists of two layers and is used for the catalytic treatment of heated exhaust gas. The two layers of the catalytic block 26 are respectively a noble metal catalyst and a non-noble metal oxide catalyst. The core active components of the precious metal catalyst are platinum (Pt), palladium (Pd), and rhodium (Rh), which are supported on the surface of a honeycomb ceramic support in the form of nano-sized particles. The core active components of non-precious metal oxide catalysts include a composite system of transition metal oxides (such as MnO2, Co3O4, CuO) and rare earth oxides (such as CeO2, La2O3) (which enhances activity through synergistic effects), and are also loaded as nano-sized particles on the surface of a honeycomb ceramic support.

[0031] The core function of both types of catalysts is the same—to lower the activation energy of the mesitylene oxidation reaction, allowing the oxidation reaction, which originally required temperatures above 800°C, to proceed efficiently at lower temperatures of 250-350°C, ultimately reducing mesitylene (VOC) to its lowest effective temperature. SIt is completely decomposed into harmless CO2 and H2O.

[0032] A hatch 27 is installed on the right side of the catalyst block 26. Opening the hatch 27 allows the catalyst block 26 to be replaced, which facilitates equipment maintenance and ensures catalytic efficiency.

[0033] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A waste gas purification device for mesitylene production, comprising a spray chamber (1), a heating chamber (13), and a catalytic chamber (25), wherein the spray chamber (1) is provided with a spray zone a, the heating chamber (13) is provided with a drying zone b and a heating zone c, and the catalytic chamber (25) is provided with a catalytic zone d, characterized in that: The spray zone a includes a partition plate two (32) installed inside the spray chamber (1), multiple air supply pipes one (2) fixed to the top of the partition plate two (32), a waterproof cap (3) at the top of the air supply pipes one (2), a through spray pipe (4) installed inside the spray chamber (1), multiple sets of nozzles (5) installed at the bottom of the spray pipe (4) located inside the chamber, a water inlet valve one (6) installed on the outer part, a drain pipe (7) installed on one side of the spray chamber (1), the inlet end of the drain pipe (7) is located on the upper side of the partition plate two (32) and does not exceed the top of the air supply pipes one (2), and a drain valve one (8) is installed in the middle of the drain pipe (7). The heating zone c includes four sets of air passage layers. Each set of air passage layers consists of two partitions (29) fixedly connected in the heating chamber (13). Multiple gas supply pipes (14) are installed between the two partitions (29) in each set. Three sets of combustion layers (28) are formed between the four sets of air passage layers. Three sets of flame nozzles (16) are installed in the middle of the heating chamber (13). The flame nozzles (16) are connected to the gas pipeline through the gas pipe (15) and are located in the middle of the combustion layer (28). The catalytic zone d includes two layers of catalytic blocks (26) installed inside the catalytic chamber (25).

2. The waste gas purification device for mesitylene production as described in claim 1, characterized in that, A water treatment area a1 is provided on one side of the spray area a. The water treatment area a1 includes a water storage tank (9) and a filter box (11). A water pump (10) is installed between the water storage tank (9) and the filter box (11). The filter box (11) is connected to the spray pipe (4) through a water pump (12). The output end of the drain pipe (7) is connected to the water storage tank (9).

3. The waste gas purification device for mesitylene production as described in claim 1, characterized in that, The two partitions (29) of the air passage layer form a vacuum layer between the inner wall of the heating chamber (13) and the outer wall of the air supply pipe (14); the vacuum layer is divided into a hot water chamber (30) and a hot air chamber (31). An exhaust pipe (18) is installed on the outside of the hot water chamber (30), and an inlet valve (17) and a drain valve (20) are installed at the upper and lower ends of the outside respectively. A connecting pipe (19) is installed on the outside of the hot water chamber (30).

4. The waste gas purification device for mesitylene production as described in claim 1, characterized in that, The drying zone b contains multiple air supply pipes (23), which are installed at the bottom of the heating chamber (13). An exhaust grille (24) is installed on one side of the bottom of the heating chamber (13). A fan (21) is installed on the left side of the hot air chamber (31) and a hot air duct (22) is installed on the right side. The hot air duct (22) extends to the bottom of the heating chamber (13) and communicates with the drying zone b.

5. The waste gas purification device for mesitylene production as described in claim 1, characterized in that, The two catalyst blocks (26) are respectively a noble metal catalyst and a non-noble metal oxide catalyst; the active components of the noble metal catalyst are platinum, palladium and rhodium, and the active components of the non-noble metal oxide catalyst are a composite system of transition metal oxides and rare earth oxides. Both types of catalysts are loaded on the surface of a honeycomb ceramic support in the form of nano-sized particles.

6. The waste gas purification device for mesitylene production as described in claim 1, characterized in that, A hatch (27) is installed on the right side of the catalytic chamber (25).

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