A waste gas treatment device for fenoxaprop synthesis

Abstract

The application discloses a waste gas treatment equipment for precise fenoxaprop synthesis, and relates to the technical field of pesticide production waste gas purification and resource recovery. The waste gas treatment equipment comprises a rack, a first waste gas treatment branch and a second waste gas treatment branch which are independent of each other before the purified gas is converged are arranged on the rack, the first waste gas treatment branch comprises a first buffer tank, a first pre-treater, a first condenser, a first gas-liquid separator and a first adsorption tank group which are sequentially connected, and the second waste gas treatment branch comprises a second buffer tank, a second pre-treater, a second condenser, a second gas-liquid separator and a second adsorption tank group which are sequentially connected. By arranging the first waste gas treatment branch and the second waste gas treatment branch which are independent of each other before the purified gas is converged, and respectively arranging the condensers, the gas-liquid separators and the condensation receiving tanks, the waste gas containing ethanol and the waste gas containing toluene can be subjected to branch condensation and independent collection, and the mixing of different recovery media is reduced.

Description

Technical Field

[0001] This invention relates to the field of pesticide production waste gas purification and resource recovery technology, specifically to a waste gas treatment device for the synthesis of quizalofop-p-ethyl. Background Technology

[0002] The production process of quizalofop-P-ethyl includes esterification, etherification, water washing, decolorization, crystallization and drying. The esterification process requires the use of ethanol and the distillation of ethanol and water. The etherification and subsequent treatment processes require the use of toluene. During operation, the relevant condensation receiving equipment, reaction equipment and drying equipment will generate uncondensed waste gas containing ethanol or toluene.

[0003] Ethanol-containing waste gas and toluene-containing waste gas differ in composition, condensate recovery products, and subsequent reuse pathways. If the two types of waste gas are directly incorporated into the same treatment flow path before condensation recovery, it is easy to cause the condensate to mix with each other, increasing the burden on subsequent separation and reuse, and the operating load of the condensation and adsorption units may fluctuate due to changes in the amount of waste gas in different processes.

[0004] When using an adsorption bed to purify condensed organic waste gas, the adsorption bed needs to be periodically taken out of operation and regenerated. The regeneration of a single adsorption bed will affect the continuity of waste gas treatment. If the regenerated gas is directly discharged or returned across branches, it may cause secondary emissions of organic matter or cross-contamination of different recovery media. Therefore, a waste gas treatment device that can treat two types of waste gas separately, recover them separately, and support the switching and regeneration of adsorption beds is needed.

[0005] To address this issue, we propose a waste gas treatment device for the synthesis of quizalofop-p-ethyl to solve the aforementioned problems. Summary of the Invention

[0006] In view of this, and in view of the shortcomings of the prior art, the present invention provides a waste gas treatment device for the synthesis of quizalofop-p-ethyl to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a waste gas treatment device for the synthesis of quizalofop-p-ethyl, comprising a frame, on which are provided a first waste gas treatment branch and a second waste gas treatment branch that are independent of each other before the purified gas convergence. The first waste gas treatment branch includes a first buffer tank, a first pre-processor, a first condenser, a first gas-liquid separator, and a first adsorption tank group connected in sequence. The second waste gas treatment branch includes a second buffer tank, a second pre-processor, a second condenser, a second gas-liquid separator, and a second adsorption tank group connected in sequence. The first adsorption tank group and the second adsorption tank group are respectively connected to an independent first nitrogen regeneration system. The first nitrogen regeneration branch and the second nitrogen regeneration branch each include two adsorption tank groups, each with two adsorption beds and a valve-controlled switching flow path connected to the two adsorption beds. Each valve-controlled switching flow path allows one of the two adsorption beds to be selectively connected to the corresponding waste gas treatment branch, and isolates the adsorption bed that is not connected from the corresponding waste gas treatment branch. The adsorption bed that is not connected is selectively connected to the corresponding nitrogen regeneration branch through the valve-controlled switching flow path. The purified gas output ends of the two adsorption tank groups are respectively connected to the purified gas manifold. The regeneration gas output end of the first nitrogen regeneration branch is connected to the upstream side of the first condenser, and the regeneration gas output end of the second nitrogen regeneration branch is connected to the upstream side of the second condenser.

[0008] Preferably, a first check valve and a first pressure regulating valve are sequentially provided between the first buffer tank and the first preprocessor, and a second check valve and a second pressure regulating valve are sequentially provided between the second buffer tank and the second preprocessor.

[0009] Preferably, the liquid phase outlet of the first gas-liquid separator is connected to an ethanol-water condenser receiving tank, and the liquid phase outlet of the second gas-liquid separator is connected to a toluene condenser receiving tank.

[0010] Preferably, the two adsorption beds of each adsorption tank group are arranged in parallel, and the air inlet of the two adsorption beds is connected to the corresponding waste gas treatment branch through an independent air inlet valve, and the air outlet of the two adsorption beds is connected to the clean gas manifold through an independent air outlet valve.

[0011] Preferably, the first nitrogen regeneration branch includes a first nitrogen source, a first regeneration fan, a first nitrogen heating component, and a first regeneration control valve group connected in sequence. The first regeneration control valve group is connected to the first adsorption tank group through a first regeneration gas supply pipe. The regeneration gas outlet of the first adsorption tank group is connected to the upstream side of the first condenser through a first regeneration exhaust pipe and a first regeneration return pipe.

[0012] Preferably, the second nitrogen regeneration branch includes a second nitrogen source, a second regeneration fan, a second nitrogen heating component, and a second regeneration control valve group connected in sequence. The second regeneration control valve group is connected to the second adsorption tank group through a second regeneration gas supply pipe. The regeneration gas outlet of the second adsorption tank group is connected to the upstream side of the second condenser through a second regeneration exhaust pipe and a second regeneration return pipe.

[0013] Preferably, the regeneration gas output end of the first nitrogen regeneration branch is provided with a first regeneration return pipe, and the regeneration gas output end of the second nitrogen regeneration branch is provided with a second regeneration return pipe. The first regeneration return pipe and the second regeneration return pipe are isolated from each other and do not merge before entering their respective first and second condensers.

[0014] Preferably, the purified gas output end of the first adsorption tank group is connected to the purified gas manifold through the first outlet check valve, and the purified gas output end of the second adsorption tank group is connected to the purified gas manifold through the second outlet check valve. The equipment also includes an explosion-proof induced draft fan, the air inlet end of which is connected to the purified gas manifold.

[0015] Preferably, the inlet end of the first buffer tank is provided with a first external connection end that connects to the uncondensed gas outlet of the esterification condensation system and the ethanol receiving system, and the inlet end of the second buffer tank is provided with a second external connection end that connects to the exhaust gas main of the synthesis kettle, the washing kettle, the toluene receiving container and the drying equipment.

[0016] Preferably, the ethanol-water condensation receiving tank and the toluene condensation receiving tank are set up independently, and the drain ends of the ethanol-water condensation receiving tank and the toluene condensation receiving tank are set up separately and are not connected to each other.

[0017] Compared with the prior art, the present invention provides a waste gas treatment device for the synthesis of quizalofop-p-ethyl, which has the following beneficial effects: By setting up independent first and second waste gas treatment branches before the purified gas convergence, and equipping them with condensers, gas-liquid separators and condensation receiving tanks respectively, ethanol-containing waste gas and toluene-containing waste gas can be condensed and collected separately, reducing the mixing of different recovery media.

[0018] By setting two adsorption beds in parallel within each adsorption tank group, one of which can be selectively connected to the waste gas treatment branch, the other adsorption bed can be in an isolated standby or regeneration state while one adsorption bed is performing adsorption purification, thereby maintaining the continuous operation of the corresponding waste gas treatment branch.

[0019] By setting up independent nitrogen regeneration branches for the two adsorption tank groups and returning the regenerated gas to the upstream side of the corresponding condenser, the organic matter released during regeneration can re-enter the condensation and gas-liquid separation path of this branch, reducing direct emissions of regenerated gas and cross-mixing of the two recovery media.

[0020] By installing outlet check valves at the purified gas output ends of the two adsorption tank groups and connecting an explosion-proof induced draft fan via a purified gas manifold, the backflow of purified gas between the two branches can be suppressed while generating exhaust gas suction power, thereby improving the stability of the branch treatment state. Attached Figure Description

[0021] Figure 1 This is a first-view perspective three-dimensional schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a second-view perspective three-dimensional schematic diagram of the overall structure of the present invention.

[0023] Figure 3 This is a partial structural diagram of the front part of the first and second waste gas treatment branches of the present invention.

[0024] Figure 4 This is a partial structural schematic diagram of the first adsorption tank group and the first nitrogen regeneration branch of the present invention.

[0025] Figure 5 This is a side view of the second waste gas treatment branch and the clean gas collection section of the present invention.

[0026] Figure 6 This is a top view of the overall structure of the present invention.

[0027] Figure 7 This is a front view schematic diagram of the overall structure of the present invention.

[0028] Figure 8 This is a partial structural schematic diagram of the second adsorption tank group and the second nitrogen regeneration branch of the present invention.

[0029] In the diagram: 1. Frame; 21. First buffer tank; 22. First check valve; 23. First pressure regulating valve; 24. First pre-processor; 25. First condenser; 26. First gas-liquid separator; 27. Ethanol-water condensate receiving tank; 28. First adsorption tank group; 29. ​​First outlet check valve; 31. Second buffer tank; 32. Second check valve; 33. Second pressure regulating valve; 34. Second pre-processor; 35. Second condenser; 36. Second gas-liquid separator; 37. Toluene condensate receiving tank; 38. Second... Adsorption tank assembly; 39. Second outlet check valve; 41. Explosion-proof induced draft fan; 51. First nitrogen source; 52. First regeneration fan; 53. First nitrogen heating assembly; 54. First regeneration control valve assembly; 55. First regeneration gas supply pipe; 56. First regeneration exhaust pipe; 57. First regeneration return pipe; 61. Second nitrogen source; 62. Second regeneration fan; 63. Second nitrogen heating assembly; 64. Second regeneration control valve assembly; 65. Second regeneration gas supply pipe; 66. Second regeneration exhaust pipe; 67. Second regeneration return pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Embodiments of the present invention Reference Figure 1 , Figure 2 , Figure 6 and Figure 7 The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl provided in this embodiment includes a frame 1. The frame 1 is used to support the first waste gas treatment branch, the second waste gas treatment branch, the first nitrogen regeneration branch, the second nitrogen regeneration branch, and the purified gas collection section. Each tank, pipeline and fan is installed in a partitioned manner according to the waste gas flow direction and maintenance space, so that the two waste gas treatment branches remain independent of each other before the purified gas collection.

[0032] Reference Figure 3 and Figure 4 The first waste gas treatment branch includes a first buffer tank 21, a first pre-processor 24, a first condenser 25, a first gas-liquid separator 26, and a first adsorption tank group 28 connected in sequence. The inlet end of the first buffer tank 21 is used to connect the uncondensed gas outlet of the esterification condensation system and the ethanol receiving system. A first check valve 22 and a first pressure regulating valve 23 are arranged in sequence between the first buffer tank 21 and the first pre-processor 24. The first buffer tank 21 contains the uncondensed gas intermittently discharged from upstream and buffers the gas volume changes. The first check valve 22 restricts the waste gas from flowing back to the upstream equipment. The first pressure regulating valve 23 regulates the airflow state from the first buffer tank 21 to the first pre-processor 24, thereby enabling the first condenser 25 and the first adsorption tank group 28 to obtain relatively stable intake conditions.

[0033] The first pre-processor 24 has a gas inlet connected to the first pressure regulating valve 23 and a gas outlet connected to the first condenser 25. The first pre-processor 24 is used to intercept entrained substances in the waste gas that are not suitable to directly enter the first condenser 25. Its internal interception structure can adopt a conventional gas pretreatment structure that is compatible with the properties of the waste gas. The pretreated waste gas enters the first condenser 25 through the gas outlet, avoiding the entrained substances from directly entering the subsequent condensation and adsorption path.

[0034] The gas outlet of the first condenser 25 is connected to the inlet of the first gas-liquid separator 26. The ethanol-containing waste gas is cooled in the first condenser 25 and forms a condensate containing ethanol and water. The gas-liquid mixture formed after condensation flows into the first gas-liquid separator 26. The first gas-liquid separator 26 introduces the liquid phase into the ethanol-water condensation receiving tank 27 and guides the gas phase to the first adsorption tank group 28. Thus, the condensable ethanol and water are recovered first, and then the organic matter in the remaining gas phase is treated by the first adsorption tank group 28.

[0035] Reference Figure 3 , Figure 5 and Figure 8 The second waste gas treatment branch includes a second buffer tank 31, a second pre-processor 34, a second condenser 35, a second gas-liquid separator 36, and a second adsorption tank group 38 connected in sequence. The inlet end of the second buffer tank 31 is used to connect to the waste gas main pipe of the synthesis kettle, the washing kettle, the toluene receiving container, and the drying equipment. A second check valve 32 and a second pressure regulating valve 33 are installed between the second buffer tank 31 and the second pre-processor 34 in sequence. The second buffer tank 31 contains the waste gas intermittently discharged from the corresponding equipment and buffers the gas volume changes. The second check valve 32 restricts the waste gas from flowing back to the waste gas main pipe. The second pressure regulating valve 33 regulates the airflow state from the second buffer tank 31 to the second pre-processor 34, thereby enabling the second condenser 35 and the second adsorption tank group 38 to obtain relatively stable inlet conditions.

[0036] The second pre-processor 34 has a gas inlet connected to the second pressure regulating valve 33 and a gas outlet connected to the second condenser 35. The second pre-processor 34 is used to intercept entrained substances in the waste gas that are not suitable to directly enter the second condenser 35. Its internal interception structure can adopt a conventional gas pretreatment structure that is compatible with the properties of the waste gas. The pretreated waste gas enters the second condenser 35 through the gas outlet, avoiding the entrained substances from directly entering the subsequent condensation and adsorption path.

[0037] The gas outlet of the second condenser 35 is connected to the inlet of the second gas-liquid separator 36. The toluene-containing waste gas is cooled in the second condenser 35 and forms toluene-containing condensate. The gas-liquid mixture formed after condensation flows into the second gas-liquid separator 36. The second gas-liquid separator 36 guides the liquid phase into the toluene condensate receiving tank 37 and directs the gas phase to the second adsorption tank group 38. Thus, the toluene that can be condensed is recovered first, and then the organic matter in the remaining gas phase is treated by the second adsorption tank group 38.

[0038] Ethanol-water condensate receiving tank 27 and toluene condensate receiving tank 37 are respectively installed on the liquid phase output path of the corresponding gas-liquid separator. The drain ends of ethanol-water condensate receiving tank 27 and toluene condensate receiving tank 37 are set separately and are not connected to each other. Therefore, the two types of condensate are discharged along independent drain paths to avoid mixing inside the equipment.

[0039] Reference Figure 2 , Figure 4 and Figure 8 The first adsorption tank group 28 and the second adsorption tank group 38 each include two adsorption beds arranged in parallel. The adsorption beds are filled with adsorption materials adapted to the corresponding organic waste gas. Each adsorption bed has a waste gas inlet end, a purified gas outlet end, a regeneration gas inlet end, and a regeneration gas outlet end. The waste gas inlet end is connected to the gas phase outlet of the corresponding gas-liquid separator through an independent inlet valve. The purified gas outlet end is connected to the purified gas manifold through an independent outlet valve. The regeneration gas inlet end is connected to the corresponding nitrogen regeneration branch through a regeneration gas supply valve. The regeneration gas outlet end is connected to the corresponding regeneration return path through a regeneration exhaust valve. The above valves together constitute a valve-controlled switching flow path that enables the two adsorption beds to switch between adsorption, standby, and regeneration states.

[0040] When the adsorption bed is in the adsorption state, the inlet and outlet valves of the adsorption bed are connected, while the regeneration supply valve and regeneration exhaust valve are closed. The gas phase discharged from the gas-liquid separator enters the adsorption bed from the waste gas inlet and passes through the adsorption material. The purified gas enters the clean gas manifold from the purified gas outlet, thereby isolating the regeneration branch from the normal waste gas treatment path.

[0041] When the adsorption bed is in standby mode, its inlet valve, outlet valve, regeneration supply valve, and regeneration exhaust valve are all closed. The adsorption bed is also isolated from the corresponding waste gas treatment branch, clean gas manifold, and nitrogen regeneration branch. This ensures that the standby adsorption bed is not disturbed by the airflow of the operating branch and can wait for the next adsorption or regeneration operation.

[0042] When the adsorption bed is in the regeneration state, the inlet and outlet valves of the adsorption bed are kept closed, while the regeneration supply and exhaust valves are connected. Heated nitrogen enters the adsorption bed from the regeneration gas inlet and passes through the adsorption material. The regeneration gas carrying the desorbed organic matter enters the corresponding regeneration return path from the regeneration gas exhaust. Since the purified gas outlet is closed during regeneration, the regeneration gas will not directly enter the purified gas manifold.

[0043] Reference Figure 4 The first nitrogen regeneration branch includes a first nitrogen source 51, a first regeneration fan 52, a first nitrogen heating component 53, and a first regeneration control valve group 54 connected in sequence. The first regeneration control valve group 54 is connected to the first adsorption tank group 28 through a first regeneration gas supply pipe 55. The first regeneration fan 52 delivers nitrogen supplied by the first nitrogen source 51. The first nitrogen heating component 53 heats the nitrogen. The first regeneration control valve group 54 introduces the heated nitrogen into the adsorption bed in the first adsorption tank group 28, which is in an isolated state, so that the adsorption material releases the adsorbed organic matter.

[0044] The first regeneration control valve group 54 is used to select the adsorption bed in the first adsorption tank group 28 that has been isolated from the waste gas treatment branch. The first regeneration gas supply pipe 55 delivers heated nitrogen to the regeneration gas inlet of the adsorption bed. The regeneration gas exhaust end of the adsorption bed is connected to the upstream side of the first condenser 25 in sequence through the first regeneration exhaust pipe 56 and the first regeneration return pipe 57, thereby allowing the regeneration gas discharged from the first adsorption tank group 28 to return to the condensation and separation path of the first waste gas treatment branch.

[0045] Reference Figure 8 The second nitrogen regeneration branch includes a second nitrogen source 61, a second regeneration fan 62, a second nitrogen heating component 63, and a second regeneration control valve group 64 connected in sequence. The second regeneration control valve group 64 is connected to the second adsorption tank group 38 through a second regeneration gas supply pipe 65. The second regeneration fan 62 delivers nitrogen supplied by the second nitrogen source 61. The second nitrogen heating component 63 heats the nitrogen. The second regeneration control valve group 64 introduces the heated nitrogen into the adsorption bed in the second adsorption tank group 38, which is in an isolated state, so that the adsorption material releases the adsorbed organic matter.

[0046] The second regeneration control valve group 64 is used to select the adsorption bed in the second adsorption tank group 38 that has been isolated from the waste gas treatment branch. The second regeneration gas supply pipe 65 delivers heated nitrogen to the regeneration gas inlet of the adsorption bed. The regeneration gas exhaust end of the adsorption bed is connected to the upstream side of the second condenser 35 through the second regeneration exhaust pipe 66 and the second regeneration return pipe 67 in sequence, thereby allowing the regeneration gas discharged from the second adsorption tank group 38 to return to the condensation and separation path of the second waste gas treatment branch.

[0047] The first regeneration return pipe 57 and the second regeneration return pipe 67 are isolated from each other and do not merge before entering their respective first condenser 25 and second condenser 35. Therefore, the organic matter released by the first adsorption tank group 28 will not enter the second waste gas treatment branch, and the organic matter released by the second adsorption tank group 38 will not enter the first waste gas treatment branch.

[0048] Reference Figure 1 , Figure 2 and Figure 5 The purified gas output end of the first adsorption tank group 28 is connected to the purified gas manifold through the first outlet check valve 29, and the purified gas output end of the second adsorption tank group 38 is connected to the purified gas manifold through the second outlet check valve 39. The air inlet end of the explosion-proof induced draft fan 41 is connected to the purified gas manifold. When the explosion-proof induced draft fan 41 is running, it forms a suction effect from the exhaust gas source end to the purified gas manifold in the two exhaust gas treatment branches. The first outlet check valve 29 and the second outlet check valve 39 are used to suppress the reverse flow of purified gas between the two branches.

[0049] The overall working process and principle of the above embodiments are as follows: After the explosion-proof induced draft fan 41 is started, it forms a suction effect in the clean gas manifold and the two waste gas treatment branches connected to the clean gas manifold. The first outlet check valve 29 and the second outlet check valve 39 allow the purified gas to flow toward the explosion-proof induced draft fan 41 and restrict the reverse flow, so that the two branches can share the suction power without backflowing to each other through the clean gas manifold.

[0050] Uncondensed gas discharged from the esterification condensation system and the ethanol receiving system enters the first buffer tank 21, passes through the first check valve 22 and the first pressure regulating valve 23, and then enters the first pre-processor 24. It then passes through the first condenser 25 and the first gas-liquid separator 26 in sequence. The first buffer tank 21 and the first pressure regulating valve 23 work together to mitigate the gas flow fluctuations. The first pre-processor 24 traps entrained materials that are not suitable for entering subsequent units. The first condenser 25 causes condensable ethanol and water to form a liquid phase. The first gas-liquid separator 26 sends the liquid phase to the ethanol-water condensation receiving tank 27 and sends the remaining gas phase to the adsorption bed in the first adsorption tank group 28, which is in an adsorption state.

[0051] The waste gas generated from the synthesis reactor, washing reactor, toluene receiving container, and drying equipment enters the second buffer tank 31 through the waste gas main pipe, then enters the second pre-processor 34 through the second check valve 32 and the second pressure regulating valve 33, and then passes through the second condenser 35 and the second gas-liquid separator 36 in sequence. The second buffer tank 31 and the second pressure regulating valve 33 work together to mitigate the inlet gas fluctuations. The second pre-processor 34 intercepts entrained materials that are not suitable for entering subsequent units. The second condenser 35 causes condensable toluene to form a liquid phase. The second gas-liquid separator 36 sends the liquid phase to the toluene condensation receiving tank 37 and sends the remaining gas phase to the adsorption bed in the second adsorption tank group 38, which is in an adsorption state.

[0052] The gas phase entering the first adsorption tank group 28 and the second adsorption tank group 38 respectively passes through the adsorption bed in its respective adsorption state. The adsorption material adsorbs the organic matter that has not formed a liquid phase in the condensation stage. The purified gas enters the clean gas manifold through the first outlet check valve 29 and the second outlet check valve 39 respectively and is discharged by the explosion-proof induced draft fan 41. Thus, condensation recovery and adsorption purification act on the corresponding waste gas in sequence.

[0053] When an adsorption bed in any adsorption tank group needs to be taken out of operation, the valve-controlled switching flow path first connects the inlet and outlet valves of the standby adsorption bed in that adsorption tank group, so that the standby adsorption bed is connected to the corresponding waste gas treatment branch and undertakes adsorption and purification. Then, the inlet and outlet valves of the original operating adsorption bed are closed, so that the original operating adsorption bed is isolated from the waste gas treatment branch and the clean gas manifold. The two adsorption beds thus complete the alternation of operating states and avoid the interruption of the corresponding waste gas treatment branch due to the exit of a single adsorption bed.

[0054] When the adsorption bed in the first adsorption tank group 28 enters the regeneration state, the first regeneration control valve group 54 selects the isolated adsorption bed and connects its regeneration gas supply valve and regeneration exhaust valve. The first regeneration fan 52 delivers the nitrogen provided by the first nitrogen source 51 to the first nitrogen heating component 53. The heated nitrogen enters the adsorption bed through the first regeneration gas supply pipe 55 and flows through the adsorption material. The regeneration gas carrying the desorbed organic matter returns to the upstream side of the first condenser 25 through the first regeneration exhaust pipe 56 and the first regeneration return pipe 57 in sequence.

[0055] The regenerated gas returning to the upstream side of the first condenser 25 passes through the first condenser 25 and the first gas-liquid separator 26 again. The ethanol and water that can be condensed in the regenerated gas form a liquid phase and enter the ethanol-water condensation receiving tank 27. The gas that does not form a liquid phase enters another adsorption bed in the first adsorption tank group 28, which is still in the adsorption state, for further purification. Therefore, the regenerated gas of the first adsorption tank group 28 will not be directly discharged into the clean gas manifold.

[0056] When the adsorption bed in the second adsorption tank group 38 enters the regeneration state, the second regeneration control valve group 64 selects the isolated adsorption bed and connects its regeneration gas supply valve and regeneration exhaust valve. The second regeneration fan 62 delivers the nitrogen provided by the second nitrogen source 61 to the second nitrogen heating component 63. The heated nitrogen enters the adsorption bed through the second regeneration gas supply pipe 65 and flows through the adsorption material. The regeneration gas carrying the desorbed organic matter returns to the upstream side of the second condenser 35 through the second regeneration exhaust pipe 66 and the second regeneration return pipe 67.

[0057] The regenerated gas returning to the upstream side of the second condenser 35 passes through the second condenser 35 and the second gas-liquid separator 36 again. The toluene that can be condensed in the regenerated gas forms a liquid phase and enters the toluene condenser receiving tank 37. The gas that does not form a liquid phase enters the second adsorption tank group 38 and is still in the adsorption state of another adsorption bed for further purification. Therefore, the regenerated gas of the second adsorption tank group 38 will not be directly discharged into the clean gas manifold.

[0058] After the adsorption bed completes regeneration, the corresponding regeneration control valve group closes the regeneration gas supply valve and regeneration exhaust valve of the adsorption bed, so that the adsorption bed is isolated from the nitrogen regeneration branch and the regeneration return path and returns to the standby state. When another adsorption bed needs to exit the adsorption state, the adsorption bed that has completed regeneration enters the next adsorption cycle in the order of first connecting to the waste gas treatment branch and then isolating the original operating adsorption bed.

[0059] The two waste gas treatment branches merge only at the clean gas manifold after the purified gas passes through the first outlet check valve 29 and the second outlet check valve 39. The condensate collection path and the regeneration gas return path remain independent before merging. The two adsorption tank groups each use one adsorption bed to perform adsorption purification while keeping the other adsorption bed in standby or regeneration state. Thus, while using the explosion-proof induced draft fan 41 to provide suction power, the ethanol waste gas and toluene waste gas are separated for condensation, recovery, continuous adsorption and independent regeneration.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste gas treatment device for the synthesis of quizalofop-p-ethyl, comprising a frame (1), characterized in that, The frame (1) is provided with a first waste gas treatment branch and a second waste gas treatment branch that are independent of each other on the upstream side of the purified gas output end. The first waste gas treatment branch includes a first buffer tank (21), a first pre-processor (24), a first condenser (25), a first gas-liquid separator (26), and a first adsorption tank group (28) connected in sequence. The second waste gas treatment branch includes a second buffer tank (31), a second pre-processor (34), a second condenser (35), a second gas-liquid separator (36), and a second adsorption tank group (38) connected in sequence. The first adsorption tank group (28) and the second adsorption tank group (38) are respectively connected to an independent first nitrogen regeneration branch. The first nitrogen regeneration branch and the second nitrogen regeneration branch, both adsorption tank groups include two adsorption beds and valve-controlled switching flow paths connected to the two adsorption beds. Each valve-controlled switching flow path allows one of the two adsorption beds to be connected to the corresponding waste gas treatment branch, and isolates the adsorption bed that is not connected from the corresponding waste gas treatment branch. The adsorption bed that is not connected is selectively connected to the corresponding nitrogen regeneration branch through the valve-controlled switching flow path. The purified gas output end of the two adsorption tank groups is connected to the purified gas manifold, the regeneration gas output end of the first nitrogen regeneration branch is connected to the upstream side of the first condenser (25), and the regeneration gas output end of the second nitrogen regeneration branch is connected to the upstream side of the second condenser (35).

2. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, A first check valve (22) and a first pressure regulating valve (23) are sequentially provided between the first buffer tank (21) and the first preprocessor (24), and a second check valve (32) and a second pressure regulating valve (33) are sequentially provided between the second buffer tank (31) and the second preprocessor (34).

3. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, The liquid phase outlet of the first gas-liquid separator (26) is connected to the ethanol-water condenser receiving tank (27), and the liquid phase outlet of the second gas-liquid separator (36) is connected to the toluene condenser receiving tank (37).

4. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, Each of the adsorption tank groups has two adsorption beds connected in parallel. The inlet ends of the two adsorption beds are connected to the corresponding waste gas treatment branch through independent inlet valves, and the outlet ends of the two adsorption beds are connected to the clean gas manifold through independent outlet valves.

5. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, The first nitrogen regeneration branch includes a first nitrogen source (51), a first regeneration fan (52), a first nitrogen heating component (53), and a first regeneration control valve group (54) connected in sequence. The first regeneration control valve group (54) is connected to the first adsorption tank group (28) through the first regeneration gas supply pipe (55). The regeneration gas outlet of the first adsorption tank group (28) is connected to the upstream side of the first condenser (25) through the first regeneration exhaust pipe (56) and the first regeneration return pipe (57) in sequence.

6. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, The second nitrogen regeneration branch includes a second nitrogen source (61), a second regeneration fan (62), a second nitrogen heating component (63), and a second regeneration control valve group (64) connected in sequence. The second regeneration control valve group (64) is connected to the second adsorption tank group (38) through the second regeneration gas supply pipe (65). The regeneration gas outlet of the second adsorption tank group (38) is connected to the upstream side of the second condenser (35) through the second regeneration exhaust pipe (66) and the second regeneration return pipe (67).

7. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, The first nitrogen regeneration branch has a first regeneration return pipe (57) at the regeneration gas output end, and the second nitrogen regeneration branch has a second regeneration return pipe (67) at the regeneration gas output end. The first regeneration return pipe (57) and the second regeneration return pipe (67) are isolated from each other and do not merge before entering their respective first condenser (25) and second condenser (35).

8. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, The purified gas output end of the first adsorption tank group (28) is connected to the purified gas manifold through the first outlet check valve (29), and the purified gas output end of the second adsorption tank group (38) is connected to the purified gas manifold through the second outlet check valve (39). It also includes an explosion-proof induced draft fan (41), and the air inlet end of the explosion-proof induced draft fan (41) is connected to the purified gas manifold.

9. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 1, characterized in that, The first buffer tank (21) has a first external connection at its inlet end that is connected to the uncondensed gas outlet of the esterification condensation system and the ethanol receiving system, and the second buffer tank (31) has a second external connection at its inlet end that is connected to the exhaust gas main of the synthesis kettle, the water washing kettle, the toluene receiving container and the drying equipment.

10. The waste gas treatment equipment for the synthesis of quizalofop-p-ethyl as described in claim 3, characterized in that, The ethanol-water condensation receiving tank (27) and the toluene condensation receiving tank (37) are set up independently of each other. The drain end of the ethanol-water condensation receiving tank (27) and the drain end of the toluene condensation receiving tank (37) are set up separately and are not connected to each other.

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