阅读说明：本技术 一种噁草酮中间体胺基醚的过滤系统及过滤方法 (Filtration system and filtration method for oxadiazon intermediate amino ether ) 是由 顾成旺 胡宏伟 丁向东 臧贤福 赵飞 刘改玲 林想 祝二辉 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种噁草酮中间体胺基醚的过滤系统及过滤方法,属于农药合成技术领域,包括反应釜及通过输送管道与反应釜连通的过滤器,反应釜内设有搅拌桨,反应釜的上方设有与其连通的氮气管道、甲苯硝基醚管道、人孔、水合肼管道和放空管道,反应釜的下方设有与其连通的放料管道,过滤器内设有过滤网,过滤网上设有压力表及与其连通的氮气管道、甲苯管道和甲苯胺基醚管道。本发明通过氮气管道向反应釜内通入氮气,并通过过滤器使催化剂留在反应釜内循环套用,胺基醚甲苯溶液压至碱洗釜,使生产效率提高,使能耗、成本、安全风险及操作强度降低,使现场气味减小,有利于达到经济、安全和环保的要求。(The invention discloses a filtering system and a filtering method of oxadiazon intermediate aminoether, belonging to the technical field of pesticide synthesis and comprising a reaction kettle and a filter communicated with the reaction kettle through a conveying pipeline, wherein a stirring paddle is arranged in the reaction kettle, a nitrogen pipeline, a toluene nitroether pipeline, a manhole, a hydrazine hydrate pipeline and an emptying pipeline which are communicated with the reaction kettle are arranged above the reaction kettle, a discharging pipeline communicated with the reaction kettle is arranged below the reaction kettle, a filter screen is arranged in the filter, and a pressure gauge, and the nitrogen pipeline, the toluene pipeline and the toluidine base ether pipeline which are communicated with the pressure gauge are arranged on the filter screen. According to the invention, nitrogen is introduced into the reaction kettle through the nitrogen pipeline, the catalyst is left in the reaction kettle through the filter for circulating use, and the aminoether toluene solution is pressed to the alkaline washing kettle, so that the production efficiency is improved, the energy consumption, the cost, the safety risk and the operation strength are reduced, the on-site smell is reduced, and the requirements of economy, safety and environmental protection are favorably met.)

1. The utility model provides a filtration system of oxadiazon midbody amino ether, including reation kettle (1) and through pipeline (3) with filter (4) of reation kettle (1) intercommunication, its characterized in that, be equipped with stirring rake (2) in reation kettle (1), reation kettle (1)'s top is equipped with nitrogen gas pipeline (7), toluene nitroether pipeline (8), manhole (12), hydrazine hydrate pipeline (13) and blow-down pipeline (14) rather than the intercommunication, reation kettle (1)'s below is equipped with discharge pipeline (10) rather than the intercommunication, be equipped with filter screen (5) in filter (4), be equipped with manometer (6) on filter screen (5) and nitrogen gas pipeline (7), toluene pipeline (9) and toluidine base ether pipeline (11) rather than the intercommunication, work as material in reation kettle (1) stews after reaching the time, through nitrogen gas pipeline (7) to in reation kettle (1), the catalyst is left in the reaction kettle (1) for recycling through the filter (4), and the aminoether toluene solution is pressed to the alkaline washing kettle.

2. The filtration system of an oxadiazon intermediate amino ether according to claim 1, wherein the manhole (12) provided at the upper part of the reaction kettle (1) is used for charging a solid catalyst, and the solid catalyst is one or more of ferric trichloride and activated carbon.

3. The filtration system of an oxadiazon intermediate amino ether according to claim 2, wherein the inner diameter of the manhole (12) is 40cm, and a sealing cover is arranged on the manhole (12), and is made of stainless steel.

4. The filtration system of claim 1, wherein the filter screen (5) is disposed inside the filter (4) and used for blocking the catalyst from penetrating through the filter screen (5), and the filter (4) has a volume of 500L and is made of stainless steel.

5. The filtration system of an oxadiazon intermediate amino ether according to claim 4, wherein the material of the pressure gauge (6) on the upper part of the filter (4) is stainless steel, the measuring range of the pressure gauge (6) is 0 to 0.6MPa, the pressure when the toluidine ether solution and the intermediate water layer are filtered is 0.25 to 0.3MPa, and the pressure when the catalyst remained in the filter (4) is subjected to back flushing is 0.08 to 0.15 MPa.

6. The filtration system of oxadiazon intermediate aminoether according to claim 1, wherein the material of the stirring paddle (2) arranged inside the reaction kettle (1) is stainless steel.

7. The filtration system of an oxadiazon intermediate amino ether according to claim 1, wherein the volume of the reaction kettle (1) is 6300L, the material is stainless steel, the pipe diameter of the nitrogen pipeline (7) is DN50, the material is carbon steel, the conveying pipeline (3), the toluene nitroether pipeline (8), the toluene pipeline (9), the discharge pipeline (10), the toluidine based ether pipeline (11), the hydrazine hydrate pipeline (13) and the emptying pipeline (14) are all provided with valves, the pipe diameters of the valves are DN50, and the materials are stainless steel.

8. A method for filtering oxadiazon intermediate amino ether is characterized by comprising the following steps:

step 1: after the materials in the reaction kettle (1) are qualified, standing and layering, wherein the upper layer is a toluidine ether solution, the middle layer is water, and the lower layer is a solid catalyst;

step 2: introducing nitrogen through a nitrogen pipeline (7), and giving positive pressure to the reaction kettle (1) to ensure that the upper toluidine ether solution and the middle water layer in the reaction kettle (1) reach the filter (4) through a conveying pipeline (3);

and step 3: the toluidine ether and water enter an alkaline washing kettle through a toluidine ether pipeline (11) through a filter screen (5) arranged in a filter (4), and a small amount of solid catalyst is blocked at the lower side of the filter screen (5) by the filter screen (5);

and 4, step 4: toluene with a fixed volume is placed through the toluene pipeline (9), nitrogen is introduced into the reactor (1) through the nitrogen pipeline (7) to blow the residual solid catalyst in the filter (4), and the catalyst is retained in the reactor (1) for cyclic application;

and 5: when the catalyst in the reaction kettle (1) does not meet the catalysis requirement, nitrogen is introduced to discharge from the discharge pipeline (10) and the catalyst is bagged.

9. The process of filtering an oxadiazon intermediate aminoether of claim 8, comprising the steps of:

step 1: before operation, all pipeline valves are in a closed state, valves arranged on an emptying pipeline (14) are opened, a valve arranged on a toluene nitroether pipeline (8) is opened, and 3000L of the mixture with the density of 1.03g/cm is put into a reaction kettle (1)³Toluene nitroether solution with the mass content of nitroether of 42.0 percent;

step 2: opening a manhole (12) arranged at the upper part of the reaction kettle (1), adding 50kg of ferric trichloride with the mass content of 99.5% and 200kg of fresh activated carbon, sealing a sealing cover, opening a stirring paddle (2), setting the rotating speed of 150-;

and step 3: opening a valve arranged on a hydrazine hydrate pipeline (13) and slowly dripping 555kg of hydrazine hydrate with the mass content of 80 percent, controlling the temperature in the kettle to be 69-72 ℃, the dripping time to be 8 hours, reacting for 6 hours, and cooling to 20 ℃ after the time is up;

and 4, step 4: opening a manhole (12), sampling and analyzing, sealing a sealing ring, stopping the reaction of nitroether at the end point of 0.1% (the reaction end point is less than or equal to 1% and is qualified), and closing valves arranged on an emptying pipeline (14), a toluene nitroether pipeline (8) and a hydrazine hydrate pipeline (13);

and 5: firstly opening valves arranged on a conveying pipeline (3) and a toluidine ether pipeline (11), then opening a valve arranged on a nitrogen pipeline (7) above a reaction kettle (1) to introduce nitrogen, wherein the pressure displayed on a pressure gauge (6) is 0.26MPa, the toluidine ether solution on the upper layer and the middle layer water in the kettle are conveyed to an alkaline washing kettle through a filter (4) and the toluidine ether pipeline (11), and a small part of catalyst is blocked on the lower side of a filter screen (5) by the filter screen (5);

step 6: when no liquid enters the alkaline washing kettle in the toluidine ether pipeline (11), firstly closing a valve arranged on a nitrogen pipeline (7) above the reaction kettle (1), then closing a valve arranged on the toluidine ether pipeline (11), then opening valves arranged on a toluene pipeline (9) and an emptying pipeline (14), and putting 100L of toluene into a filter (4);

and 7: opening a valve arranged on a nitrogen pipeline (7) above the filter (4) to introduce nitrogen, displaying the pressure on a pressure gauge (6) to be 0.1MPa, back-blowing the catalyst at the lower side of the filter screen (5) into the reaction kettle (1) for circulating and applying, and obtaining 3050L of toluidine ether solution through alkaline washing and layering, wherein the density is 1.00g/cm³The mass content of the amino ether was 37.2%, and the yield was 99.4%.

Technical Field

The invention relates to a oxadiazon intermediate filtering system and a oxadiazon intermediate filtering method, in particular to a oxadiazon intermediate amino ether filtering system and a oxadiazon intermediate amino ether filtering method, and belongs to the technical field of pesticide synthesis.

Background

Oxadiazon, also called oxadiazon, is a dual-purpose preemergence weedicide of organic heterocyclic contact-type selective water, drought, oxadiazon uses its broad, high-efficient, low-toxicity, use little, low residue, have no influence on succeeding crop, the advantage with good ecological benefits, easy to use, welcome by users, at present, oxadiazon is mainly used in industrial production and takes 2, 4-dichlorophenol as raw materials, through esterification, nitration, hydrolysis, etherification, reduction, diazotization, reduction, neutralization, acylation, cyclization, etc. ten-step reaction get oxadiazon original medicine process route.

The original synthesis route of the oxadiazon intermediate amino ether is subjected to hydrazine hydrate reduction, filter pressing is carried out by using a plate-and-frame filter press, then the solid catalyst which is subjected to filter pressing in each batch is put into a reaction kettle again for recycling, and because the solvent used in the synthesis route is toluene, filter pressing is carried out in each batch, so that the oxadiazon intermediate amino ether has the defects of large toluene smell, severe environment, high labor intensity of workers, high solid catalyst consumption and the like, and the current safety and environmental protection requirements cannot be met.

Disclosure of Invention

The invention mainly aims to provide a filtration system and a filtration method of oxadiazon intermediate aminoether, which are used for solving the problems of large toluene smell and high solid catalyst consumption in the prior art.

The purpose of the invention can be achieved by adopting the following technical scheme:

the utility model provides a filtration system of oxadiazon midbody amino ether, include reation kettle and through pipeline with the filter of reation kettle intercommunication, be equipped with the stirring rake in the reation kettle, reation kettle's top is equipped with rather than nitrogen gas pipeline, toluene nitroether pipeline, manhole, hydrazine hydrate pipeline and the blow-down pipeline of intercommunication, reation kettle's below is equipped with rather than the blow-down pipeline of intercommunication, be equipped with the filter screen in the filter, be equipped with the manometer on the filter screen and rather than nitrogen gas pipeline, toluene pipeline and the toluidine base ether pipeline of intercommunication, work as material in the reation kettle stews after reaching the time, through nitrogen gas pipeline to let in nitrogen gas in the reation kettle, and pass through the filter makes the catalyst remain at the reation kettle inner loop and apply mechanically, and amino ether toluene dissolves hydraulic pressure to the alkali wash cauldron.

The preferable scheme is that the manhole arranged at the upper part of the reaction kettle is used for feeding solid catalyst, and the solid catalyst is one or more of ferric trichloride and activated carbon.

In any of the above schemes, preferably, the inner diameter of the manhole is 40cm, and the manhole is provided with a sealing cover made of stainless steel.

In any of the above schemes, preferably, the filter screen disposed inside the filter is used for blocking the catalyst from penetrating and filtering onto the filter screen, the filter has a volume of 500L, and is made of stainless steel.

In any of the above schemes, preferably, the pressure gauge on the upper part of the filter is made of stainless steel, the range of the pressure gauge is 0-0.6MPa, the pressure when the toluidine ether solution and the middle water layer are filtered is 0.25-0.3MPa, and the pressure of the catalyst remained in the filter after back flushing is 0.08-0.15 MPa.

In any of the above embodiments, preferably, the stirring paddle disposed inside the reaction kettle is made of stainless steel.

In any one of the above schemes, preferably, the volume of the reaction kettle is 6300L, the material is stainless steel, the pipe diameter of the nitrogen pipeline is DN50, the material is carbon steel, valves are arranged on the conveying pipeline, the toluene nitroether pipeline, the toluene pipeline, the discharge pipeline, the toluidine-based ether pipeline, the hydrazine hydrate pipeline and the emptying pipeline, the pipe diameters of the valves are DN50, and the material is stainless steel.

A method for filtering oxadiazon intermediate amino ether comprises the following steps:

step 1: after the materials in the reaction kettle are qualified in reaction, standing and layering, wherein the upper layer is a toluidine ether solution, the middle layer is water, and the lower layer is a solid catalyst;

step 2: introducing nitrogen through a nitrogen pipeline, and giving positive pressure to the reaction kettle to enable the toluidine ether solution at the upper layer and the water at the middle layer in the reaction kettle to reach the filter through a conveying pipeline;

and step 3: allowing toluidine ether and water to enter an alkaline washing kettle through a toluidine ether pipeline through a filter screen arranged in a filter, and blocking a small amount of solid catalyst on the lower side of the filter screen by the filter screen;

and 4, step 4: putting toluene with a fixed volume into the toluene pipeline, and blowing the residual solid catalyst in the filter into the reaction kettle through the nitrogen pipeline by introducing nitrogen, so that the catalyst is remained in the reaction kettle for circulating and applying;

and 5: when the catalyst in the reaction kettle does not meet the catalysis requirement, nitrogen is introduced to discharge from the discharge pipeline and the catalyst is bagged.

The preferable scheme is that the filtration method of the oxadiazon intermediate amino ether comprises the following steps:

step 1: before operation, all pipeline valves are in a closed state, valves arranged on an emptying pipeline are opened, and a 3000L of valve with the density of 1.03g/cm is opened and put into a reaction kettle³Toluene nitroether solution with the mass content of nitroether of 42.0 percent;

step 2: opening a manhole arranged at the upper part of the reaction kettle, adding 50kg of 99.5 mass percent ferric trichloride and 200kg of fresh activated carbon, sealing a sealing cover, starting a stirring paddle, setting the rotating speed to be 200 r/min, and slowly heating to 70 ℃;

and step 3: opening a valve arranged on a hydrazine hydrate pipeline, slowly dripping 555kg of hydrazine hydrate with the mass content of 80%, controlling the temperature in the kettle to be 69-72 ℃, the dripping time to be 8 hours, reacting for 6 hours, and cooling to 20 ℃ after the time is up;

and 4, step 4: opening a manhole for sampling and analyzing, sealing a sealing ring, stopping the reaction until the reaction end point is 0.10 percent of the residual nitroether (the reaction end point is not more than 1 percent and is qualified), and closing valves arranged on an emptying pipeline, a toluene nitroether pipeline and a hydrazine hydrate pipeline;

and 5: firstly opening valves arranged on a conveying pipeline and a toluidine ether pipeline, then opening a valve arranged on a nitrogen pipeline above a reaction kettle to introduce nitrogen, wherein the display pressure on a pressure gauge is 0.26MPa, the toluidine ether solution on the upper layer and the middle layer water in the kettle are conveyed to an alkaline washing kettle through a filter and the toluidine ether pipeline, and a small part of catalyst is blocked at the lower side of a filter screen by the filter screen;

step 6: when no liquid in the toluidine ether pipeline enters the alkaline washing kettle, firstly closing a valve arranged on a nitrogen pipeline above the reaction kettle, then closing a valve arranged on the toluidine ether pipeline, then opening valves arranged on the toluene pipeline and an emptying pipeline, and putting 100L of toluene into a filter;

and 7: opening a valve arranged on a nitrogen pipeline above the filter to introduce nitrogen, wherein the pressure displayed on a pressure gauge is 0.1MPa, a catalyst on the lower side of the filter screen is reversely blown into the reaction kettle for circulating and applying, and obtaining 3050L of toluidine ether solution with the density of 1.00g/cm through alkaline washing and layering³The mass content of the amino ether was 37.2%, and the yield was 99.4%.

The invention has the beneficial technical effects that: the filtration system of the oxadiazon intermediate aminoether provided by the invention changes the traditional process, uses a plate-and-frame filter press for filter pressing, retains the solid catalyst in the reaction kettle through the filter for cyclic application, and introduces nitrogen to blow out and bag the catalyst in the reaction kettle from a kettle bottom discharge pipeline after the solid catalyst is applied for a certain number of times, so that the field working environment is greatly improved, the labor intensity of workers and the consumption of the solid catalyst are reduced, and the filtration system is safer and more environment-friendly.

Drawings

Fig. 1 is a schematic diagram of a preferred embodiment of a filtration system for an oxadiazon intermediate aminoether in accordance with the present invention.

In the figure: 1-a reaction kettle, 2-a stirring paddle, 3-a conveying pipeline, 4-a filter, 5-a filter screen, 6-a pressure gauge, 7-a nitrogen pipeline, 8-a toluene nitroether pipeline, 9-a toluene pipeline, 10-a discharge pipeline, 11-a toluidine based ether pipeline, 12-a manhole, 13-a hydrazine hydrate pipeline and 14-a vent pipeline.

Detailed Description

In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1, the filtration system for oxadiazon intermediate aminoether provided in this embodiment includes a reaction kettle 1 and a filter 4 communicated with the reaction kettle 1 through a conveying pipeline 3, a stirring paddle 2 is disposed in the reaction kettle 1, a nitrogen pipeline 7, a toluene nitroether pipeline 8, a manhole 12, a hydrazine hydrate pipeline 13 and an emptying pipeline 14 are disposed above the reaction kettle 1 and communicated with the reaction kettle 1, a discharge pipeline 10 communicated with the reaction kettle 1 is disposed below the reaction kettle 1, a filter screen 5 is disposed in the filter 4, a pressure gauge 6 and the nitrogen pipeline 7, the toluene pipeline 9 and a toluidine based ether pipeline 11 are disposed on the filter screen 5 and communicated with the pressure gauge 6, when the material in the reaction kettle 1 is left standing for a certain time, nitrogen is introduced into the reaction kettle 1 through the nitrogen pipeline 7, and the catalyst is left in the reaction kettle 1 through the filter 4 for recycling, the aminoether toluene solution is pressed to an alkaline washing kettle, the manhole 12 disposed on the upper portion of the reaction kettle, the solid catalyst is one or more of ferric trichloride and activated carbon, the inner diameter of a manhole 12 is 40cm, a sealing cover is arranged on the manhole 12 and is made of stainless steel, a filter screen 5 arranged in a filter 4 is used for preventing the catalyst from penetrating to the filter screen 5 to be detected, the volume of the filter 4 is 500L and is made of stainless steel, a pressure gauge 6 on the upper part of the filter 4 is made of stainless steel, the range of the pressure gauge 6 is 0-0.6MPa, the pressure when the toluidine base ether solution and a middle water layer are filtered is 0.25-0.3MPa, the pressure of the catalyst remained in the filter 4 after back flushing is 0.08-0.15MPa, a stirring paddle 2 arranged in a reaction kettle 1 is made of stainless steel, the volume of the reaction kettle 1 is 6300L and is made of stainless steel, a nitrogen pipeline 7 is DN50 and is made of carbon steel, a conveying pipeline 3, a toluene nitroether pipeline 8, a toluene pipeline 9, a toluene pipeline, Valves are arranged on the discharge pipeline 10, the toluidine-based ether pipeline 11, the hydrazine hydrate pipeline 13 and the emptying pipeline 14, the pipe diameters of the valves are DN50, and the valves are made of stainless steel.

In this embodiment, the method for filtering an oxadiazon intermediate amino ether provided in this embodiment includes the following steps:

step 1: after the materials in the reaction kettle 1 are qualified in reaction, standing and layering, wherein the upper layer is a toluidine ether solution, the middle layer is water, and the lower layer is a solid catalyst;

step 2: introducing nitrogen through a nitrogen pipeline 7, and giving positive pressure to the reaction kettle 1 to ensure that the upper toluidine base ether solution and the middle layer water in the reaction kettle 1 reach the filter 4 through the conveying pipeline 3;

and step 3: through a filter screen 5 arranged in a filter 4, toluidine ether and water enter an alkaline washing kettle through a toluidine ether pipeline 11, and a small amount of solid catalyst is blocked at the lower side of the filter screen 5 by the filter screen 5;

and 4, step 4: toluene with a fixed volume is put in through a toluene pipeline 9, and nitrogen is introduced into the reaction kettle 1 through a nitrogen pipeline 7 to blow the residual solid catalyst in the filter 4, so that the catalyst is remained in the reaction kettle 1 for circulating and reusing;

and 5: when the catalyst in the reaction kettle 1 does not meet the catalysis requirement, nitrogen is introduced to discharge from the discharge pipeline 10 and is bagged.

In this embodiment, the method for filtering an oxadiazon intermediate amino ether provided in this embodiment includes the following steps:

step 1: before operation, all pipeline valves are in a closed state, the valve arranged on the emptying pipeline 14 is opened, the valve arranged on the toluene nitroether pipeline 8 is opened, 3000L of the valve with the density of 1.03g/cm is put into the reaction kettle 1³Toluene nitroether solution with the mass content of nitroether of 42.0 percent;

step 2: opening a manhole 12 arranged at the upper part of the reaction kettle 1, adding 50kg of 99.5 mass percent ferric trichloride and 200kg of fresh activated carbon, sealing a sealing cover, starting a stirring paddle 2, setting the rotating speed to 2000 r/min, and slowly heating to 70 ℃;

and step 3: opening a valve arranged on a hydrazine hydrate pipeline 13, slowly dripping 555kg of hydrazine hydrate with the mass content of 80%, controlling the temperature in the kettle to be 69-72 ℃, the dripping time to be 8 hours, reacting for 6 hours, and cooling to 20 ℃ after the time is up;

and 4, step 4: opening a manhole 12 for sampling and analyzing, sealing a sealing ring, stopping the reaction until the reaction end point is 0.10 percent of the residual nitroether (the reaction end point is less than or equal to 1 percent and is qualified), and closing valves arranged on an emptying pipeline 14, a toluene nitroether pipeline 8 and a hydrazine hydrate pipeline 13;

and 5: firstly opening valves arranged on a conveying pipeline 3 and a toluidine ether pipeline 11, then opening a valve arranged on a nitrogen pipeline 7 above a reaction kettle 1 and introducing nitrogen, wherein the pressure displayed on a pressure gauge 6 is 0.26MPa, the upper toluidine ether solution and the middle water in the kettle are conveyed to an alkaline washing kettle through a filter 4 and the toluidine ether pipeline 11, and a small part of catalyst is blocked at the lower side of a filter screen 5 by the filter screen 5;

step 6: when no liquid enters the alkaline washing kettle in the toluidine ether pipeline 11, firstly closing a valve arranged on the nitrogen pipeline 7 above the reaction kettle 1, then closing a valve arranged on the toluidine ether pipeline 11, then opening valves arranged on the toluene pipeline 9 and the emptying pipeline 14, and putting 100L of toluene into the filter 4;

and 7: opening a valve arranged on a nitrogen pipeline 7 above the filter 4, introducing nitrogen, displaying the pressure on a pressure gauge 6 to be 0.1MPa, back-blowing the catalyst at the lower side of the filter screen 5 into the reaction kettle 1 for recycling, and obtaining 3050L of toluidine ether solution with the density of 1.00g/cm through alkaline washing and layering³The mass content of the amino ether was 37.2%, and the yield was 99.4%.

In this example, the data for catalyst recycling through the filtration system of the oxadiazon intermediate aminoether provided in this example are shown in table 1 below:

TABLE 1 catalyst recycle by filtration System data

According to the series of experimental data, when the catalyst is circularly applied to 35 batches, the reaction time is increased by 3.5 hours, the yield is reduced, when the catalyst is applied to 36 batches, the reaction time is longer, the yield is obviously reduced, the catalyst can not obviously achieve the catalytic effect, all valves are closed at the moment, the valves arranged on the nitrogen pipeline 7 and the discharge pipeline 10 above the reaction kettle 1 are opened, the catalyst is blown out from the discharge pipeline 10 through introducing nitrogen, is bagged, and is placed into a dangerous waste warehouse.

In summary, in this embodiment, the filtration system of oxadiazon intermediate aminoether provided in this embodiment provides a filtration system that allows the catalyst to remain in the reaction kettle for recycling by changing the conventional plate-and-frame filter pressing manner, and has the advantages of high production efficiency, low working strength, low risk, less field unorganized exhaust gas, and the like.

The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.