Fluidized bed reactor for chlorothalonil with catalyst recovery system
By introducing an internal and external air duct structure of cyclone separator and U-shaped dust separator into the fluidized bed reactor, two-stage sedimentation and secondary dust separation of activated carbon catalyst are achieved, solving the clogging problem caused by activated carbon escape and improving the reactor's operating efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG DACHENG BIOCHEMICAL CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-31
AI Technical Summary
In the production of chlorothalonil, some of the activated carbon catalyst after the fluidized bed reaction will enter the fixed bed with the gas, causing blockage of the ventilation pores and affecting the reaction cycle and product quality.
A fluidized bed reactor with a catalyst recovery system is adopted, including cyclone separator one and cyclone separator two, combined with the inner and outer air ducts of a U-shaped dust separator. Through two-stage sedimentation and secondary dust separation technology, the activated carbon catalyst can be recovered and reused to prevent escape.
It effectively reduces the loss of activated carbon catalyst, lowers the concentration of dust in the exhaust gas, reduces the risk of blockage in fixed-bed reactors, extends the reactor life cycle, and reduces operating costs.
Smart Images
Figure CN224573719U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fluidized bed reactor technology, and specifically discloses a fluidized bed reactor for chlorothalonil with a catalyst recovery system. Background Technology
[0002] Chlorothalonil is a highly effective, low-toxicity, and broad-spectrum fungicide. It has preventive effects against various fungal diseases of crops by disrupting enzyme systems, inhibiting respiration, and acting at multiple sites. It has stable efficacy and a long residual period and is widely used in agriculture, wood preservation, and industrial mildew prevention.
[0003] In the production of chlorothalonil, the gas needs to pass through a fluidized bed reactor and a fixed bed reactor in succession. During the reaction, heated nitrogen, chlorine and vaporized isophthalonitrile are mixed. The mixed gas enters from the bottom of the fluidized bed to react. The fluidized bed contains a large amount of activated carbon as a catalyst for the reaction. The reaction is a gas-solid phase catalytic reaction. However, after passing through the cyclone separator, some of the activated carbon will escape from the activated carbon adsorber and continue to enter the fixed bed with the gas. After a period of time, it will block the air pores of the fixed bed, affecting the reaction cycle and product quality. Utility Model Content
[0004] In view of the shortcomings of the prior art, this utility model provides a fluidized bed reactor for chlorothalonil with a catalyst recovery system, so as to solve the problem that after the reaction in the fluidized bed reactor, some activated carbon will enter the fixed bed with the gas, thereby clogging the ventilation pores of the fixed bed and affecting the reaction cycle and product quality.
[0005] The technical solution adopted by this utility model to solve its technical problem is: The fluidized bed reactor for chlorothalonil with catalyst recovery system includes a reaction body. A cyclone separator I is fixedly installed in the upper part of the inner cavity of the reaction body, and a cyclone separator II is fixedly installed on the outer wall of one side of the reaction body. Cyclone separator I and cyclone separator II are connected by a pipe I, and the diameter of cyclone separator I is larger than the diameter of cyclone separator II. A main air inlet is connected to the bottom end of the reaction body, and a secondary air inlet is connected to the pipe I. A U-shaped dust separator is connected to the top of cyclone separator II through pipe II. The U-shaped dust separator includes an inner air duct and an outer air duct, and the flow velocity of the outer air duct is greater than that of the inner air duct. A reflux cyclone chamber is opened at the end of the outer air duct away from pipe II. An air outlet is provided on the outer wall of the end of the outer air duct away from pipe II. The end of the inner air duct away from pipe II is connected to the secondary air inlet through pipe III.
[0006] Furthermore, a partition plate is fixedly installed in the middle of the U-shaped dust separator, and the inner cavity of the U-shaped dust separator is divided into an inner air duct and an outer air duct by the partition plate.
[0007] Furthermore, a flow regulating valve is installed at one end of the partition plate near pipe two. The flow regulating valve is used to regulate the flow of the internal air duct and the external air duct.
[0008] Furthermore, a one-way valve is installed at the end of the partition plate away from the second pipe. The one-way valve is used to control the catalyst dust in the return cyclone chamber from entering the inner air duct.
[0009] Furthermore, a porous distribution plate 1 and a porous distribution plate 2 are fixedly and spaced apart at the lower part of the reaction body. The middle parts of the porous distribution plate 1 and the porous distribution plate 2 are respectively provided with a number of through holes 1 and a number of through holes 2 evenly and spaced apart.
[0010] Furthermore, the diameter of some through holes one is larger than the diameter of some through holes two.
[0011] Furthermore, an air inlet is provided at the lower part of one side of the reaction body, and the air inlet is connected between the porous distribution plate one and the porous distribution plate two.
[0012] Furthermore, the porous distribution plate one and the porous distribution plate two divide the reaction body into a lower air intake section and an upper reaction section. The air intake section has a trumpet-shaped structure with openings at both ends, and the main air intake path is connected to the small diameter end of the air intake section. The porous distribution plate one is fixedly installed at the large diameter end of the air intake section.
[0013] Furthermore, a feed inlet is provided at the top of one side of the reaction body.
[0014] Furthermore, both cyclone separator one and cyclone separator two are equipped with discharge pipes at their bottom ends. The discharge pipe of cyclone separator one is connected to the inner cavity of the reaction body, and the discharge pipe of cyclone separator two is connected to a dust collection tank.
[0015] The beneficial effects of this utility model are: This invention achieves two-stage sedimentation of activated carbon catalyst by setting up cyclone separator one and cyclone separator two, which can retain a large amount of activated carbon catalyst in the fluidized bed reactor and reduce catalyst loss. The U-shaped dust separator includes an inner air duct and an outer air duct, with the flow velocity in the outer air duct being greater than that in the inner air duct. Gas enters the outer air duct with a faster flow velocity, while catalyst powder enters the inner air duct with a slower flow velocity for recirculation. Gas containing catalyst powder enters the outer air duct, achieving primary dust separation. Then, the gas in the outer air duct forms a vortex in the recirculation cyclone chamber, causing the catalyst dust to be thrown back into the inner air duct for recirculation under the action of centrifugal force. This design achieves secondary dust separation, ensuring that a large amount of activated carbon catalyst remains in the fluidized bed reactor. Gas containing catalyst dust, returning through the internal air duct, re-enters the cyclone separator for further treatment via the secondary inlet pipe, enabling the reuse of the activated carbon catalyst. This effectively prevents catalyst escape, reduces dust concentration in the exhaust gas, and minimizes catalyst loss. Furthermore, this design reduces the operating pressure of the activated carbon filter, lowers the risk of blockage in the fixed-bed reactor, reduces maintenance costs, extends the lifespan of a single reactor, and lowers operating costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the porous distribution plate 1, porous distribution plate 2, through hole 1, and through hole 2 of this utility model.
[0017] In the diagram: 1. Reactor body; 2. Cyclone separator one; 3. Cyclone separator two; 4. Main air inlet; 5. Secondary air inlet; 6. U-shaped dust separator; 7. Inner air duct; 8. Outer air duct; 9. Reflux cyclone chamber; 10. Air outlet; 11. Divider plate; 12. Flow regulating valve; 13. Check valve; 14. Dust collection tank; 15. Feed inlet; 16. Porous distribution plate one; 17. Porous distribution plate two; 18. Through hole one; 19. Through hole two; 20. Air inlet; 21. Air inlet section; 22. Discharge pipeline; 23. Reaction section. Detailed Implementation
[0018] The present invention will now be described and explained in detail with reference to the accompanying drawings.
[0019] Example 1 like Figure 1-2As shown, the fluidized bed reactor for chlorothalonil with catalyst recovery system includes a reaction body 1. A cyclone separator 1 2 is fixedly installed in the upper part of the inner cavity of the reaction body 1. A cyclone separator 2 3 is fixedly installed on the outer wall of one side of the reaction body 1. The cyclone separator 1 2 and the cyclone separator 2 3 are connected by a pipe 1, and the diameter of the cyclone separator 1 2 is larger than the diameter of the cyclone separator 2 3. The bottom end of the reaction body 1 is connected to a main air inlet 4, and a secondary air inlet 5 is connected to the pipe 1. The top end of the cyclone separator 2 3 is connected to a U-shaped dust separator 6 through the pipe 2. The U-shaped dust separator 6 includes an inner air duct 7 and an outer air duct 8, and the flow velocity of the outer air duct 8 is greater than the flow velocity of the inner air duct 7. A return cyclone chamber 9 is opened at the end of the outer air duct 8 away from the pipe 2. An air outlet 10 is provided on the outer wall of the end of the outer air duct 8 away from the pipe 2. The end of the inner air duct 7 away from the pipe 2 is connected to the secondary air inlet 5 through the pipe 3.
[0020] This invention achieves two-stage sedimentation of activated carbon catalyst by setting up cyclone separator 2 and cyclone separator 3, which can retain a large amount of activated carbon catalyst in the fluidized bed reactor and reduce catalyst loss. The U-shaped dust separator 6 includes an inner air duct 7 and an outer air duct 8, with the flow velocity in the outer air duct 8 being greater than that in the inner air duct 7. Gas enters the outer air duct 8 with a faster flow velocity, while catalyst powder enters the inner air duct 7 with a slower flow velocity for recirculation. The gas containing catalyst powder enters the outer air duct 8, achieving primary dust separation. Then, the gas in the outer air duct 8 forms a vortex in the return cyclone chamber 9, causing the catalyst dust to be thrown back into the inner air duct 7 for recirculation under the action of centrifugal force, achieving secondary dust separation. The dust separation process ensures that a large amount of activated carbon catalyst remains in the fluidized bed reactor. The gas containing catalyst dust, which is returned through the internal air duct 7, re-enters the cyclone separator 2 3 through the secondary air inlet 5 for further processing, realizing the reuse of activated carbon catalyst. The gas after dust separation is discharged through the outlet 10, effectively preventing the escape of activated carbon catalyst, reducing the dust concentration in the tail gas, and reducing catalyst loss. This invention reduces the operating pressure of the activated carbon filter, reduces the risk of blockage in the fixed bed reactor, reduces maintenance costs, extends the life cycle of a single reactor, and reduces operating costs.
[0021] A partition plate 11 is fixedly installed in the middle of the U-shaped dust separator 6. The inner cavity of the U-shaped dust separator 6 is divided into an inner air duct 7 and an outer air duct 8 by the partition plate 11.
[0022] A flow regulating valve 12 is provided at one end of the partition plate 11 near the second pipe. The flow regulating valve 12 is used to regulate the flow of the inner air duct 7 and the outer air duct 8. The flow regulating valve 12 can rotate to both sides of the inner air duct 7 and the outer air duct 8, and can adjust the size of the inner air duct 7 and the outer air duct 8 near the second pipe, thereby regulating the flow of the inner air duct 7 and the outer air duct 8.
[0023] A one-way valve 13 is installed at the end of the partition plate 11 away from the second pipe. The one-way valve 13 is used to control the catalyst dust in the return cyclone chamber 9 from entering the inner air duct 7. The one-way valve 13 enables the catalyst dust in the outer air duct 8 to move unidirectionally into the inner air duct 7, and the gas in the inner air duct 7 cannot enter the outer air duct 8 through the one-way valve 13.
[0024] The lower part of the reaction body 1 is provided with a porous distribution plate 16 and a porous distribution plate 17 at intervals and fixedly arranged. The middle part of the porous distribution plate 16 and the porous distribution plate 17 are respectively provided with a number of through holes 18 and a number of through holes 29 evenly and at intervals.
[0025] The diameter of some through holes 18 is larger than the diameter of some through holes 19.
[0026] An air inlet 20 is provided on the lower part of one side of the reaction body 1, and the air inlet 20 is connected between the porous distribution plate 16 and the porous distribution plate 17.
[0027] The porous distribution plate 16 and the porous distribution plate 17 divide the reaction body 1 into the lower air intake section 21 and the upper reaction section 23. The air intake section 21 has a trumpet-shaped structure with openings at both ends, and the main air intake passage 4 is connected to the small diameter end of the air intake section 21. The porous distribution plate 16 is fixedly installed at the large diameter end of the air intake section 21.
[0028] With the above configuration, the porous distribution plate 16 is located below the porous distribution plate 17, and the diameter of the through hole 18 is larger than that of the through hole 19. The porous distribution plate 16 can pre-distribute the gas and buffer the airflow impact, while the porous distribution plate 17 can finely distribute the airflow to ensure uniform fluidization of the bed. The air inlet 20 connects the porous distribution plate 16 and the porous distribution plate 17. Nitrogen enters the space between the porous distribution plate 16 and the porous distribution plate 17 through the air inlet 20, which can prevent the reaction gas from backflowing and clean the pores of the distribution plate. The air inlet section 21 has a trumpet-shaped structure with openings at both ends, and the larger diameter end is set upward, which can make the mixed gas pass through several through holes 18 more evenly, ensuring uniform pre-distribution of the gas.
[0029] A feed inlet 15 is provided at the top of one side of the reaction body 1. Activated carbon catalyst is added into the reaction body 1 through the feed inlet 15.
[0030] Both cyclone separator 2 and cyclone separator 3 are equipped with discharge pipes 22 at their bottom ends. The discharge pipe 22 of cyclone separator 2 is connected to the inner cavity of the reaction body 1, and the discharge pipe 22 of cyclone separator 3 is connected to a dust collection tank 14. Cyclone separator 2 can recover and retain large catalyst particles, and discharge the large catalyst particles back into the reaction section 23 through the discharge pipe 22 on cyclone separator 2. Cyclone separator 3 can separate and collect fine catalyst dust, and discharge the catalyst dust into the dust collection tank 14 through the discharge pipe 22 on cyclone separator 3.
[0031] Working principle and process: Cyclone separator 1 (2) and cyclone separator 2 (3) are connected in series. During operation, activated carbon catalyst is added to the reaction body 1 through feed inlet 15. Simultaneously, a mixture of chlorine and vaporized isophthalonitrile is introduced into the inlet section 21 through the main air inlet 4. The mixture enters evenly between porous distribution plate 16 and porous distribution plate 27 through several through holes 18 on porous distribution plate 16. At this time, nitrogen is introduced between porous distribution plate 16 and porous distribution plate 27 through air inlet 20. Then, the mixture of nitrogen, chlorine, and vaporized isophthalonitrile passes through the porous distribution plate... Several through holes 19 on the cloth plate 17 evenly enter the reaction section 23; then the mixed gas enters the cyclone separator 2 for primary settling, recovering and retaining large catalyst particles. The large catalyst particles are discharged back into the reaction section 23 through the discharge pipe 22 on the cyclone separator 2. The gas is input into the cyclone separator 3 through pipe 1 for secondary settling, separating and collecting fine catalyst dust. The catalyst dust is discharged into the dust collection tank 14 through the discharge pipe 22 on the cyclone separator 3. The gas is input into the U-shaped dust separator 6 through pipe 2.
[0032] At this point, adjust the flow regulating valve 12 to a suitable position, and adjust the end of the inner air duct 7 and the outer air duct 8 closest to the second pipe to a suitable size, so that the flow rates of the inner air duct 7 and the outer air duct 8 are stable. Since the flow velocity of the outer air duct 8 is greater than that of the inner air duct 7, the catalyst powder is more likely to enter the slower-flowing inner air duct 7 for recirculation. The catalyst powder that does not enter the inner air duct 7 enters the outer air duct 8 with the gas, achieving primary dust separation. Then, the gas containing catalyst powder in the outer air duct 8 forms a vortex in the recirculation cyclone chamber 9. The catalyst dust is thrown back into the inner air duct 7 under the action of centrifugal force, realizing secondary dust separation; the one-way valve 13 enables the catalyst dust in the outer air duct 8 to move unidirectionally into the inner air duct 7, and the gas in the inner air duct 7 cannot enter the outer air duct 8 through the one-way valve 13; the gas containing catalyst dust that flows back through the inner air duct 7 re-enters the cyclone separator 2 3 through the secondary air inlet 5 via the pipeline 3 for reprocessing, realizing the reuse of activated carbon catalyst, while the gas after dust separation is discharged through the outlet 10.
Claims
1. A fluidized bed reactor for chlorothalonil with a catalyst recovery system, comprising a reaction body (1), characterized in that, Cyclone separator one (2) is fixedly installed on the upper part of the inner cavity of the reaction body (1), and cyclone separator two (3) is fixedly installed on the outer wall of one side of the reaction body (1). Cyclone separator one (2) and cyclone separator two (3) are connected by a pipe, and the diameter of cyclone separator one (2) is larger than the diameter of cyclone separator two (3). The bottom end of the reaction body (1) is connected to the main air intake (4), and the pipe is connected to the auxiliary air intake (5). Cyclone separator two (3) The top of the ) is connected to a U-shaped dust separator (6) through pipe two. The U-shaped dust separator (6) includes an inner air duct (7) on the inside and an outer air duct (8) on the outside. The flow velocity of the outer air duct (8) is greater than that of the inner air duct (7). A return cyclone chamber (9) is opened at the end of the outer air duct (8) away from pipe two. An air outlet (10) is provided on the outer wall of the end of the outer air duct (8) away from pipe two. The end of the inner air duct (7) away from pipe two is connected to the auxiliary air intake (5) through pipe three.
2. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 1, characterized in that, A partition plate (11) is fixedly installed in the middle of the U-shaped dust separator (6). The inner cavity of the U-shaped dust separator (6) is divided into an inner air duct (7) and an outer air duct (8) by the partition plate (11).
3. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 2, characterized in that, A flow regulating valve (12) is installed at one end of the partition plate (11) near the second pipe. The flow regulating valve (12) is used to regulate the flow of the inner air duct (7) and the outer air duct (8).
4. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 2, characterized in that, A one-way valve (13) is installed at the end of the partition plate (11) away from the second pipe. The one-way valve (13) is used to control the catalyst dust in the return cyclone chamber (9) from entering the inner air duct (7).
5. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 1, characterized in that, The lower part of the reaction body (1) is provided with a porous distribution plate 1 (16) and a porous distribution plate 2 (17) spaced apart and fixedly arranged. The middle part of the porous distribution plate 1 (16) and the porous distribution plate 2 (17) are provided with a number of through holes 1 (18) and a number of through holes 2 (19) evenly and spaced apart.
6. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 5, characterized in that, The diameter of some through holes one (18) is larger than the diameter of some through holes two (19).
7. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 5, characterized in that, An air inlet (20) is provided on the lower part of one side of the reaction body (1), and the air inlet (20) is connected between the porous distribution plate one (16) and the porous distribution plate two (17).
8. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 5, characterized in that, The porous distribution plate one (16) and the porous distribution plate two (17) divide the reaction body (1) into the lower air intake section (21) and the upper reaction section (23). The air intake section (21) is a trumpet-shaped structure with openings at both ends, and the main air intake path (4) is connected to the small diameter end of the air intake section (21). The porous distribution plate one (16) is fixedly installed at the large diameter end of the air intake section (21).
9. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 1, characterized in that, A feed inlet (15) is provided on the top of one side of the reaction body (1).
10. The fluidized bed reactor for chlorothalonil with a catalyst recovery system according to claim 1, characterized in that, Both cyclone separator 1 (2) and cyclone separator 2 (3) are equipped with discharge pipes (22). The discharge pipe (22) of cyclone separator 1 (2) is connected to the inner cavity of the reaction body (1), and the discharge pipe (22) of cyclone separator 2 (3) is connected to a dust collection tank (14).