A device for recovering monomethylamine in the production of acetamiprid benzylamine

Abstract

This invention provides a device for recovering and utilizing monomethylamine in the production of acetamiprid benzylamine, relating to the technical field of recovery and utilization devices. It solves the problem of low efficiency due to the long time required for monomethylamine removal in current methods. The device includes a removal reaction unit, an absorption unit, a separation unit, and a storage unit connected in sequence. The removal reaction unit includes a reaction vessel with a steam inlet at the bottom and a gas outlet at the top. The surface of the reaction vessel is covered with an insulation layer, and a stirring device is also provided. The stirring device includes a motor installed at the center of the top of the reaction vessel and a stirring shaft extending into the interior of the reaction vessel, with two layers of stirring paddles mounted on the stirring shaft. This device can effectively recover and utilize monomethylamine generated during the production of acetamiprid benzylamine, reducing resource waste and improving the recovery efficiency and utilization rate of monomethylamine.

Description

Technical Field

[0001] This utility model belongs to the technical field of recycling devices, and more specifically, it relates to a device for recycling monomethylamine in the production of acetamiprid benzylamine. Background Technology

[0002] The production process of acetamiprid benzylamine generates waste gas or liquid containing monomethylamine. If monomethylamine is not effectively treated and recovered, it will cause multiple problems. On the one hand, it will result in a significant waste of resources and increase production costs; on the other hand, the emission of monomethylamine into the environment will put pressure on the environment, polluting air and water sources and affecting the ecological balance. Furthermore, the accumulation of monomethylamine-containing substances in the production site may also affect the stability and safety of the production process, potentially leading to safety accidents.

[0003] Based on the above, the inventors have discovered the following problems: Currently, there are many shortcomings in the recovery and utilization of monomethylamine in the production of acetamiprid. During the recovery process, the removal of monomethylamine takes a long time, which directly affects the overall production efficiency, extending the production cycle and increasing costs.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a device for the recovery and utilization of monomethylamine in the production of acetamiprid benzylamine, in order to achieve a more practical purpose. Utility Model Content

[0005] To address the aforementioned technical problems, this invention provides a device for recovering and utilizing monomethylamine in the production of acetamiprid benzylamine, thereby solving the problem of low efficiency caused by the long time required for monomethylamine removal.

[0006] The purpose and effectiveness of this utility model's device for recovering and utilizing monomethylamine in the production of acetamiprid benzylamine are achieved through the following specific technical means:

[0007] A device for recovering monomethylamine in the production of acetamiprid benzylamine includes a deamination reaction unit, an absorption unit, a separation unit and a storage unit connected in sequence. The deamination reaction unit includes a reaction vessel with a steam inlet at the bottom and a gas phase outlet at the top. The surface of the reaction vessel is covered with a heat insulation layer and a stirring device. The stirring device includes a motor installed at the center of the top of the reaction vessel and a stirring shaft extending into the interior of the reaction vessel. Two layers of stirring paddles are installed on the stirring shaft.

[0008] Furthermore, the absorption unit includes an absorption tower, the bottom inlet of which is connected to the gas phase outlet of the deamine reaction unit via a pipeline. A spraying device is installed inside the absorption tower, which includes multiple annular spray pipes installed on the inner wall of the absorption tower and an absorbent delivery pump connected to the annular spray pipes via a pipeline. A packing layer is also located below the spraying device inside the absorption tower, and a tail gas outlet is provided at the top of the absorption tower.

[0009] Furthermore, the separation unit includes a separation tank, the top inlet of which is connected to the outlet of the absorption tower via a water pump. A filter screen is provided at the inlet of the separation tank, a filter layer is provided in the middle of the interior of the separation tank, a layered chamber is provided below, and a drain outlet is provided at the bottom of the layered chamber.

[0010] Furthermore, the storage unit includes a storage tank, the top inlet of which is connected to the outlet of the separation unit via a pipe, a magnetic level gauge is installed on the side of the storage tank, and a safety valve is installed on the top.

[0011] Furthermore, it also includes a control unit, which consists of a control cabinet, sensors, and actuators. The control cabinet is equipped with a PLC controller, which can receive sensor signals and automatically adjust the actuators according to a preset program.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention establishes a complete monomethylamine recovery and utilization process by setting up a deamination reaction unit, an absorption unit, a separation unit, and a storage unit. It can effectively recover and utilize monomethylamine generated during the production of acetamiprid benzylamine, reducing resource waste and improving the recovery efficiency and utilization rate of monomethylamine.

[0014] The installation of a stirring device and a steam inlet in the deamination reaction unit helps to accelerate the removal of monomethylamine, shorten the deamination time, thereby improving the production efficiency of the core process, shortening the production cycle, and reducing production costs.

[0015] The combined use of the packing layer and spray device in the absorption unit increases the contact area and contact time between monomethylamine and the absorbent, thereby improving the absorption rate of monomethylamine and making the production process more stable. The close coordination between the various units of the entire device, along with the control unit's ability to monitor and adjust operating parameters in real time, helps ensure product quality stability, improves the safety performance of core processes, reduces the possibility of accidents, and guarantees safe and stable production in the workshop. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a monomethylamine recovery and utilization device in the production of acetamiprid benzylamine according to this utility model.

[0017] Figure 2 This is a cross-sectional schematic diagram of the reaction vessel in a methylamine recovery and utilization device for the production of acetamiprid benzylamine according to this utility model.

[0018] Figure 3 This is a cross-sectional schematic diagram of the absorption tower in a methylamine recovery and utilization device for the production of acetamiprid benzylamine according to this utility model.

[0019] Figure 4 This is a cross-sectional schematic diagram of the separation tank in a monomethylamine recovery and utilization device for the production of acetamiprid benzylamine according to this utility model.

[0020] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0021] 1. Deamination reaction unit; 101. Reactor; 102. Steam inlet; 103. Gas outlet; 104. Stirring device;

[0022] 1041. Motor; 1042. Stirring shaft; 1043. Stirring paddle;

[0023] 2. Absorption unit; 201. Absorption tower; 202. Spraying device; 203. Packing layer;

[0024] 2021, Annular spray pipe; 2022, Absorbent delivery pump;

[0025] 3. Separation unit; 301. Separation tank; 302. Filter layer; 303. Layered chamber; 304. Drain outlet;

[0026] 4. Storage unit; 401. Storage tank; 402. Magnetic level gauge; 403. Safety valve;

[0027] 5. Control unit. Detailed Implementation

[0028] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0029] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] As attached Figure 1 To be continued Figure 4 As shown:

[0032] This utility model provides a monomethylamine recovery and utilization device in the production of acetamiprid benzylamine, which includes a deamination reaction unit 1, an absorption unit 2, a separation unit 3 and a storage unit 4 connected in sequence. Each unit works in concert to form a complete monomethylamine recovery and utilization process.

[0033] The deamination reaction unit 1 includes a reaction vessel 101, which facilitates the entry of monomethylamine-containing materials generated during the production of acetamiprid benzylamine. A steam inlet 102 is provided at the bottom of the vessel, allowing steam at different pressures to be introduced. By adjusting the steam pressure, the temperature and pressure inside the reaction vessel 101 are controlled to promote the removal of monomethylamine. A gas outlet 103 is provided at the top of the reaction vessel 101 to discharge the removed monomethylamine gas and transport it to the absorption unit 2. A heat insulation layer, made of rock wool or polyurethane material, is provided on the surface of the reaction vessel 101, effectively reducing heat loss, maintaining a stable temperature inside the reaction vessel 101, and improving reaction efficiency.

[0034] It also includes a stirring device 104, which includes a motor 1041 and a stirring shaft 1042. The motor 1041 is installed at the center of the top of the reactor 101, and the stirring shaft 1042 extends into the interior of the reactor 101, with two layers of stirring paddles 1043 mounted on the shaft. Starting the motor 1041 and adjusting the stirring speed can ensure that the materials are fully mixed, accelerate the removal of monomethylamine, and shorten the removal time.

[0035] The absorption unit 2 includes an absorption tower 201. The bottom inlet of the absorption tower 201 is connected to the gas phase outlet 103 of the deamine reaction unit 1 via a pipeline. The pipeline is equipped with a valve and a flow meter to control the flow rate of monomethylamine gas. The absorption unit 2 also includes a spray device 202 installed inside the absorption tower 201. The spray device 202 includes multiple annular spray pipes 2021 installed on the inner wall of the absorption tower 201, and an absorbent delivery pump 2022. The annular spray pipes 2021 are connected to the absorbent delivery pump 2022 via a pipeline. When the absorbent delivery pump 2022 is started, the absorbent can be sprayed evenly through the annular spray pipes 2021 to increase the contact area between the absorbent and the monomethylamine gas.

[0036] It also includes a packing layer 203 disposed within the absorption tower 201, located below the spray device 202, and made of polypropylene. The packing layer 203 can further increase the contact area and contact time between monomethylamine and the absorbent, thereby improving the absorption rate of monomethylamine;

[0037] The top of the absorption tower 201 is equipped with a tail gas outlet, which is connected to a tail gas treatment device via a pipeline. The tail gas treatment device contains an adsorbent, which can purify the small amount of gas that has not been absorbed, ensuring that the emitted gas meets environmental protection requirements.

[0038] Separation unit 3 includes a separation tank 301. The top inlet of separation tank 301 is connected to the outlet of absorption tower 201 via a water pump. A filter screen is installed at the inlet to initially filter larger impurities and prevent them from entering separation tank 301 and affecting subsequent separation effects. A filter layer 302 is installed inside separation tank 301, located in the middle of the tank. This filter layer is a mixture of activated carbon and quartz sand, which further purifies the mixture and removes fine impurities and harmful substances. A stratification chamber 303 is located below separation tank 301. By setting an inclined baffle, the mixture naturally stratifies within the tank to obtain a relatively pure monomethylamine solution. A drain outlet 304 is located at the bottom of stratification chamber 303, and a valve is installed at the drain outlet 304 to facilitate periodic cleaning of impurities generated during the separation process.

[0039] Storage unit 4 includes a storage tank 401 made of stainless steel, which has good corrosion resistance. The top inlet of storage tank 401 is connected to the outlet of separation unit 3 via a pipe. A check valve is installed on the pipe to prevent backflow of the monomethylamine solution. A magnetic float level gauge 402 is also installed on the side of storage tank 401, which can display the liquid level in the tank in real time, making it convenient for operators to monitor the amount of monomethylamine solution stored in storage tank 401. It also includes a safety valve 403 installed on the top of storage tank 401, which automatically opens to release pressure when the pressure in the tank exceeds a set value, ensuring storage safety and preventing safety accidents such as explosion of storage tank 401 due to excessive pressure.

[0040] It also includes a control unit 5, which consists of a control cabinet, sensors, and actuators. The sensors include a temperature sensor and a pressure sensor installed in the deamination reaction unit 1; a level sensor and a concentration sensor installed in the absorption unit 2; a level sensor installed in the separation unit 3; and a level sensor and a pressure sensor installed in the storage unit 4. The actuators include electric valves on each pipeline, a motor 1041 for the stirring device 104, an absorbent delivery pump 2022, etc.

[0041] The control cabinet is equipped with a PLC controller, which can receive signals from sensors and automatically adjust the actuators according to preset programs to achieve real-time monitoring and control of the operating parameters of each unit. For example, based on the signals from temperature and pressure sensors, the steam volume of steam inlet 102 and the stirring speed of stirring device 104 are automatically adjusted; based on the signals from the liquid level and concentration sensors of absorption unit 2, the flow rate of absorbent delivery pump 2022 is controlled, etc.

[0042] Operating steps:

[0043] Deamination process: The methylamine-containing material generated during the production of acetamiprid benzylamine is fed into the reactor 101 of the deamination reaction unit 1 through the raw material inlet. The stirring device 104 is started, and the stirring speed is adjusted to a suitable value to ensure thorough mixing of the material. Steam is introduced through the steam inlet 102, and the steam volume is adjusted according to the reaction requirements to control the temperature and pressure inside the reactor 101 within a suitable range, promoting the removal of methylamine from the material. The removed methylamine gas enters the absorption unit 2 through the gas phase outlet 103. During the deamination process, temperature and pressure sensors monitor the temperature and pressure inside the reactor 101 in real time and transmit the signals to the control cabinet. The control cabinet automatically adjusts the steam volume at the steam inlet 102 and the stirring speed of the stirring device 104 according to a preset program to ensure that the deamination reaction proceeds under optimal conditions.

[0044] Absorption Process: After monomethylamine gas enters the absorption tower 201, the absorbent delivery pump 2022 is activated, spraying absorbent into the absorption tower 201 through the spray device 202. During its ascent, the monomethylamine gas comes into full contact with the falling absorbent in the packing layer 203, and the monomethylamine is absorbed by the absorbent, forming a mixture. A small amount of unabsorbed gas enters the tail gas treatment device through the tail gas outlet for processing. During the absorption process, level sensors and concentration sensors monitor the liquid level and absorbent concentration in the absorption tower 201 in real time and transmit the signals to the control cabinet. The control cabinet automatically adjusts the flow rate of the absorbent delivery pump 2022 according to a preset program to ensure the absorption effect.

[0045] Separation Process: The absorbed mixture flows out from the bottom of the absorption tower 201 and enters the separation tank 301 of the separation unit 3. The mixture first passes through the filter screen at the inlet to remove larger impurities. Then it passes through the filter layer 302 to further remove fine impurities and harmful substances. Under the action of the layered structure, the mixture achieves natural stratification, resulting in a relatively pure monomethylamine solution. Impurities generated during the separation process can be periodically discharged through the drain port 304. During the separation process, the liquid level sensor monitors the liquid level in the separation tank 301 in real time. When the liquid level reaches the set value, the control cabinet controls the relevant valves and equipment to ensure the smooth progress of the separation process.

[0046] Storage Process: The separated monomethylamine solution enters the storage tank 401 of storage unit 4 through a pipeline. The liquid level in storage tank 401 is monitored in real time by a level gauge. When the liquid level reaches the set upper limit, the relevant valve is closed to stop the feeding. Safety valve 403 constantly monitors the pressure inside the tank to ensure the safe storage of the monomethylamine solution. During the storage process, level and pressure sensors monitor the liquid level and pressure in storage tank 401 in real time and transmit the signals to the control cabinet. When an abnormality occurs, the control cabinet automatically takes corresponding measures to ensure storage safety.

[0047] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A device for recycling monomethylamine in the production of acetamiprid and benzalkonium chloride, characterized in that: The apparatus includes a deamination reaction unit (1), an absorption unit (2), a separation unit (3), and a storage unit (4) connected in sequence. The deamination reaction unit (1) includes a reactor (101). The reactor (101) has a steam inlet (102) at the bottom, a gas outlet (103) at the top, and a heat insulation layer on its surface. It is also equipped with a stirring device (104). The stirring device (104) includes a motor (1041) installed at the center of the top of the reactor (101) and a stirring shaft (1042) extending into the reactor (101). Two layers of stirring paddles (1043) are installed on the stirring shaft (1042). ​ 2. The device for recycling monomethylamine in the production of acetamiprid and benzalkonium chloride according to claim 1, characterized in that: The absorption unit (2) includes an absorption tower (201). The bottom inlet of the absorption tower (201) is connected to the gas phase outlet (103) of the deamine reaction unit (1) through a pipeline. A spray device (202) is installed inside the absorption tower (201). The spray device (202) includes multiple annular spray pipes (2021) installed on the inner wall of the absorption tower (201) and an absorbent delivery pump (2022) connected to the annular spray pipes (2021) through a pipeline. A packing layer (203) is also located below the spray device (202) inside the absorption tower (201). A tail gas outlet is provided at the top of the absorption tower (201).

3. The device for recycling monomethylamine in the production of acetamiprid and benzalkonium chloride according to claim 2, characterized in that: The separation unit (3) includes a separation tank (301). The top inlet of the separation tank (301) is connected to the outlet of the absorption tower (201) via a water pump. A filter screen is provided at the inlet of the separation tank (301). A filter layer (302) is provided in the middle of the separation tank (301), and a layered chamber (303) is provided below it. A drain outlet (304) is provided at the bottom of the layered chamber (303).

4. The methylamine recovery and utilization device in the production of acetamiprid benzylamine as described in claim 3, characterized in that: The storage unit (4) includes a storage tank (401), the top inlet of the storage tank (401) is connected to the outlet of the separation unit (3) through a pipe, a magnetic float level gauge (402) is installed on the side of the storage tank (401), and a safety valve (403) is installed on the top.

5. The device for recycling monomethylamine in the production of acetamiprid and benzalkonium chloride according to claim 4, characterized in that: It also includes a control unit (5), which consists of a control cabinet, sensors and actuators. The control cabinet is equipped with a PLC controller, which can receive sensor signals and automatically adjust the actuators according to a preset program.

Images