CN211659291U - Recovery unit of methylamine in acetamiprid production - Google Patents
Recovery unit of methylamine in acetamiprid production Download PDFInfo
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- CN211659291U CN211659291U CN202020092907.6U CN202020092907U CN211659291U CN 211659291 U CN211659291 U CN 211659291U CN 202020092907 U CN202020092907 U CN 202020092907U CN 211659291 U CN211659291 U CN 211659291U
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- monomethylamine
- acetamiprid
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Abstract
The utility model relates to a recovery device of monomethylamine in acetamiprid production, which comprises a distillation device, a condensing device and a receiving device, wherein the distillation device is sequentially connected with the condensing device and the receiving device; the distillation device comprises a distillation kettle, a motor and a stirring paddle, wherein the motor is arranged at the upper end of the distillation kettle and drives the stirring paddle in the distillation kettle through a rotating shaft; the condensing device comprises a condenser and a gas-liquid separation disc, and the receiving device comprises a receiving tank and a gas phase balance pipeline. The utility model improves the safety of the recovery of the monomethylamine in the production process of the acetamiprid, improves the recovery rate of the monomethylamine and improves the field working environment; in addition the utility model has the advantages of simple integral structure, simple operation between each reation kettle improves work efficiency, has also improved product quality simultaneously.
Description
Technical Field
The utility model belongs to chemical production device field, concretely relates to recovery unit of monomethylamine in acetamiprid production.
Background
Monomethylamine is an important aliphatic amine organic chemical raw material and is widely applied to pesticide production. Monomethylamine is a combustible gas at normal temperature and pressure, has strong ammonia odor at high concentration or during compression liquefaction, has a boiling point of-6.8 ℃, and is an important raw material for synthesizing a neonicotinoid pesticide acetamiprid. The gas is easy to combust, is easy to form explosive mixture with air, belongs to middle-class toxicity, has strong irritation and corrosivity, can cause acute poisoning of a contactant by accidental contact in the production process, has strong irritation on eyes, upper respiratory tract, skin and mucosa, and can damage lungs by high-concentration inhalation. Therefore, the gas needs to be strictly prevented from leaking during use so as to avoid harm to human bodies and pollution to the environment.
In the production of acetamiprid, in order to improve the conversion rate, the monomethylamine is greatly excessive, and after the reaction is finished, the monomethylamine needs to be recycled. In the prior art, because the accumulated amount of the gasified monomethylamine is large, in the process of desolventizing and recovering the monomethylamine, if condensation or absorption is not timely, the condition of monomethylamine leakage caused by overpressure of a reaction kettle often occurs, even dangerous conditions such as material flushing and the like occur, the damage to personnel is caused, and the pollution is caused to the operating environment.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a methylamine recovery device in acetamiprid production, which has the advantages that the reaction process is continuous by connecting a distillation device, a condensing device and a receiving device in sequence, the whole structure is simple, the operation among reaction kettles is convenient, the work efficiency is improved, and the product quality is also improved; the reaction rate is improved by additionally arranging a metering pump, a stirring paddle, a sampling detection port, a linkage pressure gauge, a pressure control valve and the like, and the safety of the reaction process is ensured; the data of the temperature display can be accurately introduced into corresponding cold medium, and in addition, a heat-insulating jacket is added on the liquid outlet pipeline to ensure the condensation effect; the pipeline barrier strips are arranged in the U-shaped cooling pipe, so that the flow velocity of the refrigerating fluid is slowed down, and the energy utilization rate is improved; adding detection device at the tail gas interface, can detecting out the harmful gas in the tail gas fast, avoid the contaminated air that this kind of volatile gas of monomethylamine leads to, influence operational environment, harm staff's health scheduling problem.
The utility model discloses a realize above-mentioned technical purpose, provide following technical scheme: a recovery device of monomethylamine in acetamiprid production is characterized by comprising a distillation device, a condensation device and a receiving device, wherein the distillation device is sequentially connected with the condensation device and the receiving device, the distillation device is connected with the condensation device through an air outlet pipeline, and the condensation device is connected with the receiving device through a liquid outlet pipeline;
the distillation device comprises a distillation kettle, a motor and a stirring paddle, wherein the motor is arranged at the upper end of the distillation kettle and drives the stirring paddle in the distillation kettle through a rotating shaft, a distillation kettle feed port, a distillation kettle gas outlet and a sample outlet detection port are arranged at the upper end of the distillation kettle, and a distillation kettle discharge port is arranged at the lower end of the distillation kettle;
the condenser comprises a refrigerant coil, a solvent feed inlet, an air inlet, a liquid outlet and a tail gas interface, wherein the solvent feed inlet and the tail gas interface are arranged right above the condenser, the air inlet is arranged on the side wall of the lower part of the condenser, and the liquid outlet is arranged right below the condenser;
the receiving device comprises a receiving tank and a gas phase balance pipeline, the gas phase balance pipeline is arranged on the upper side of the receiving tank and is connected with the tail gas interface, the receiving tank comprises a U-shaped cooling coil and a feed opening, the feed opening is arranged at the lowest end, and the U-shaped cooling coil is arranged at 1/3 at the lower end of the receiving tank;
further, a metering pump is additionally arranged on a feeding hole of the distillation kettle;
further, an air outlet of the distillation kettle is provided with an interlocking pressure gauge and a pressure cut-off valve;
further, the solvent feed inlet is a spraying opening;
further, the refrigerant coil is an annular spiral coil and is provided with a refrigerant feeding hole and a refrigerant discharging hole;
furthermore, a temperature display is arranged in the middle of the condenser;
further, heat-insulating jackets are arranged on the distillation device and the liquid outlet pipeline;
furthermore, a pipeline barrier strip is arranged in the U-shaped cooling coil in the forward direction;
furthermore, a liquid level meter is arranged on the side wall of the receiving tank;
furthermore, the tail gas interface and the end point of the gas phase balance pipeline are provided with detectors.
Owing to adopted above technique, the utility model discloses compare with prior art, it is showing the advantage and is:
1) add the measuring pump on the stills feed inlet, accomplish the function of carrying, measurement and regulation simultaneously, guaranteed the ration transport of material, avoided the waste of material, the stirring rake in the stills has accelerated the reaction process, whether the detection discharge liquid that the sample detection mouth can be timely is up to standard, gas outlet line is gone out in the control that chain pressure gauge, pressure control valve can be automatic, increase reaction process's security.
2) Among the condensing equipment, the input amount and the transport rate of control refrigerant medium that data through temperature monitor can be accurate, the solvent feed inlet is for spraying the mouth, can absorb the monomethylamine gas of non-condensation, increases the heat preservation on the liquid outlet pipe and presss from both sides the cover, ensures the effect of condensation.
3) Through optimizing receiving arrangement, improved the absorption efficiency of solvent to monomethylamine, the inside pipeline that sets up of U type cooling tube separates the strip, has slowed down the velocity of flow of cryogenic fluid, has not only guaranteed the cooling effect, has still improved energy utilization and has rateed.
4) Through adding detection device at the tail gas interface, avoid harmful gas to leak and cause the pollution to the surrounding environment, avoid endangering that the staff is healthy simultaneously.
Drawings
FIG. 1 is a schematic structural diagram of a device for recovering monomethylamine in acetamiprid production according to the present invention;
FIG. 2 is a schematic view of a partial structure of a U-shaped cooling coil of a monomethylamine recovery device in acetamiprid production according to the present invention;
FIG. 3 is a schematic view of a cross-sectional partial structure of a U-shaped cooling coil of a monomethylamine recovery device in acetamiprid production according to the present invention;
FIG. 4 is a schematic diagram of the structure of a solvent feed inlet of a device for recovering monomethylamine in the production of acetamiprid;
in the figure: 1-a distillation device, 11-a distillation kettle, 12-a metering pump, 13-a distillation kettle feeding hole, 14-a motor, 15-a stirring paddle, 16-a sample outlet detection hole, 17-a distillation kettle discharging hole, 18-a heat preservation jacket, 19-a distillation kettle gas outlet, 110-an interlocking pressure gauge, 111-a pressure cut-off valve, 112-a gas outlet pipeline, 2-a condensing device, 21-a condenser, 22-a gas-liquid separation disc, 23-a solvent feeding hole, 24-a gas inlet, 25-a refrigerant discharging hole, 26-a refrigerant feeding hole, 27-a temperature display, 28-a refrigerant coil pipe, 29-a tail gas interface, 210-a liquid outlet pipeline, 211-a pipeline jacket, 212-a blanking valve, 3-a receiving device and a 31-U-shaped cooling coil pipe, 32-a liquid outlet, 33-a feed opening, 34-a liquid level meter, 35-a gas phase balance pipeline, 36-a detector, 37-a tail gas pipeline, 38-a receiving tank support, 39-a pipeline barrier strip, 310-a coil pipe support, 311-a refrigerating fluid inlet and 312-a refrigerating fluid outlet.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to specific embodiments, but the scope of the present invention is not limited thereto.
The metering pump used in the embodiment is a diaphragm metering pump, the flow can be adjusted from zero to the maximum rated value range at will, the metering pump is purchased from environment-friendly equipment Limited company of Feilong, Huai' an city, and the used liquid level meter is an UHZ-25 type magnetic float liquid level meter.
Example 1
As shown in fig. 1, the embodiment of the utility model provides a recovery unit of monomethylamine in acetamiprid production, including distillation plant 1, condensing equipment 2, receiving arrangement 3, distillation plant 1 connects gradually with condensing equipment 2, receiving arrangement 3, distillation plant 1 and condensing equipment 2 are connected through gas outlet pipeline 112, and condensing equipment 2 links to each other with receiving arrangement 3 through liquid outlet pipeline 210. Excessive monomethylamine enters the condensing device 2 through the distilling device 1 and the gas outlet pipeline 112, the state of the condensed monomethylamine is changed into liquid, the liquid enters the receiving device through the liquid outlet pipeline 210 to react, the liquid outlet pipeline 210 extends into the bottom of the receiving device, and the operation between reaction kettles is convenient and fast.
The distillation device 1 comprises a distillation kettle 11, a motor 14 and a stirring paddle 15, wherein the motor 14 is arranged at the upper end of the distillation kettle 11, a motor switch is started, the motor 14 drives the stirring paddle 15 in the distillation kettle 11 through a rotating shaft, and the stirring paddle 15 rotates at a constant speed to accelerate the distillation process; the upper end of the distillation still 11 is provided with a distillation still feed inlet 13, a distillation still gas outlet 19 and a sample outlet detection port 16, and the distillation still sample outlet detection port 16 is arranged on one side of the distillation still gas outlet 19, so that the sampling inspection at any time is facilitated; the lower end is provided with a distillation kettle discharge hole 17, the distillation kettle discharge hole 17 is arranged at the lower end of the distillation kettle, so that materials in the distillation kettle can be thoroughly discharged, a heat-insulating jacket 18 is arranged outside the distillation kettle, and a metering pump 12 is additionally arranged on a distillation kettle feed hole 13, so that accurate feeding can be achieved; the gas outlet of the distillation still is provided with an interlocking pressure gauge 110 and a pressure cut-off valve 111, so that the pressure in the distillation still can be conveniently controlled, the internal pressure can be safely regulated and controlled, and the safety of the reaction process can be ensured.
The condensing device 2 comprises a condenser 21 and a gas-liquid separation disc 22, wherein the condenser 21 comprises a refrigerant coil 28, a solvent feed inlet 23, a gas inlet 24, a liquid outlet 32 and a tail gas interface 29, the solvent feed inlet 23 and the tail gas interface 29 are arranged right above the condenser, the solvent feed inlet is a spraying port, the gas inlet is arranged on the side wall of the lower part of the condenser, and the liquid outlet 32 is arranged right below the condenser; the refrigerant coil 28 is an annular spiral coil and is arranged inside the condenser 21, the refrigerant inlet 26 is arranged on the side wall of the lower end of the condenser, the refrigerant outlet 25 is arranged on the side wall of the upper end of the condenser, the temperature display 27 is arranged inside the condenser, and is positioned in the middle of the condenser, so that the temperature inside the condenser can be mastered at any time, and the conveying amount and the conveying speed of a refrigerant medium are controlled.
The receiving device 3 comprises a receiving tank and a gas phase balance pipeline 35, the gas phase balance pipeline 35 is arranged on the upper side of the receiving tank and is connected with the tail gas interface 29, a toluene receiving tank is supported by a receiving tank support 38, the receiving tank comprises a U-shaped cooling coil 31 and a feed opening 33, the feed opening 33 is arranged at the lowest end, the U-shaped cooling coil 31 is supported at the lower end 1/3 inside the toluene receiving tank through a coil support 310, a solvent is sprayed through a solvent feed opening 23 and enters the toluene receiving tank through a condensing device, the toluene and the solvent enter the toluene receiving tank through a liquid outlet pipeline 210 after opening a feed valve 212, the solvent carries out secondary absorption of monomethylamine in the toluene receiving tank, a pipeline jacket 211 is arranged outside the liquid outlet pipeline 210 to play a heat preservation measure, a liquid level meter 34 is arranged on the side wall of the toluene receiving tank, the height of the liquid level is clearly and, but also gives attention to alarm control and output of remote transmission signals. Refrigerating fluid is introduced from a refrigerating fluid inlet 311, flows through the U-shaped cooling coil 31, flows out from a refrigerating fluid outlet 312, a pipeline barrier strip 39 is arranged in the U-shaped cooling coil 31 in a downstream direction, the pipeline barrier strip 39 can slow down the flow velocity of the refrigerating fluid, and the cooling efficiency is improved; the tail gas interface 29 and the end point of the gas phase balance pipeline 35 are provided with the detector 36, the gas phase balance pipeline 35 is filled between the condensing device and the receiving tank, and before the blanking valve 212 is opened, the gas phase in the balance pipeline and the receiving tank can be prevented from leaking harmful gas to pollute the surrounding environment, the health of workers can be prevented from being harmed, and the safety is improved.
By the utility model, the excessive monomethylamine can be recovered, and the functions of conveying, metering and adjusting can be simultaneously completed by arranging the metering pump, thereby simplifying the production process flow; the liquid level meter can clearly and accurately indicate the height of the liquid level, the detector can accurately detect harmful gas in tail gas, the pollution to the surrounding air is avoided, and meanwhile, the harm to the health of workers is avoided; the inner wall of the U-shaped cooling coil is provided with the pipeline barrier strip, so that the retention time of the refrigerating fluid in the pipe is prolonged, and the cooling cost is reduced; the design spray the mouth and can make the abundant mixture of monomethylamine and solvent, promote its reaction, and overall structure divide into distillation plant, condensing equipment, receiving arrangement, and the simple operation has effectually promoted work efficiency between each reation kettle.
The above-mentioned embodiments are merely preferred technical solutions of the present invention, and should not be regarded as limitations of the present invention, and the protection scope of the present invention should be protected by the technical solutions described in the claims, and equivalent alternatives including technical features in the technical solutions described in the claims are also within the protection scope of the present invention.
Claims (10)
1. A recovery device of monomethylamine in acetamiprid production is characterized by comprising a distillation device, a condensation device and a receiving device, wherein the distillation device is sequentially connected with the condensation device and the receiving device, the distillation device is connected with the condensation device through an air outlet pipeline, and the condensation device is connected with the receiving device through a liquid outlet pipeline;
the distillation device comprises a distillation kettle, a motor and a stirring paddle, wherein the motor is arranged at the upper end of the distillation kettle and drives the stirring paddle in the distillation kettle through a rotating shaft, a distillation kettle feed port, a distillation kettle gas outlet and a sample outlet detection port are arranged at the upper end of the distillation kettle, and a distillation kettle discharge port is arranged at the lower end of the distillation kettle;
the condenser comprises a refrigerant coil, a solvent feed inlet, an air inlet, a liquid outlet and a tail gas interface, wherein the solvent feed inlet and the tail gas interface are arranged right above the condenser, the air inlet is arranged on the side wall of the lower part of the condenser, and the liquid outlet is arranged right below the condenser;
receiving arrangement is including receiving jar, the balanced pipeline of gaseous phase, the balanced pipeline setting of gaseous phase receive jar upside and with tail gas interface connection, receive the jar and include U-shaped cooling coil, feed opening, the feed opening setting is at the least significant end, and U-shaped cooling coil sets up in receiving jar lower extreme 1/3 department.
2. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein a metering pump is additionally arranged at a feed inlet of the distillation still.
3. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein the air outlet of the distillation still is provided with an interlocking pressure gauge and a pressure cut-off valve.
4. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein the solvent feed inlet is a spray outlet.
5. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein the refrigerant coil is an annular spiral coil, and is provided with a refrigerant inlet and a refrigerant outlet.
6. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein a temperature display is arranged in the middle of the condenser.
7. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein the distillation device and the liquid outlet pipeline are provided with heat insulation jackets.
8. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein a pipe barrier is arranged inside the U-shaped cooling coil in the forward direction.
9. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein a liquid level meter is arranged on the side wall of the receiving tank.
10. The recycling device of monomethylamine in acetamiprid production according to claim 1, wherein the tail gas interface and the end point of the gas phase balance pipeline are provided with detectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020092907.6U CN211659291U (en) | 2020-01-16 | 2020-01-16 | Recovery unit of methylamine in acetamiprid production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020092907.6U CN211659291U (en) | 2020-01-16 | 2020-01-16 | Recovery unit of methylamine in acetamiprid production |
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| CN211659291U true CN211659291U (en) | 2020-10-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114699782A (en) * | 2022-03-08 | 2022-07-05 | 常州工学院 | Chemical energy-saving rectification system and control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114699782A (en) * | 2022-03-08 | 2022-07-05 | 常州工学院 | Chemical energy-saving rectification system and control device |
| CN114699782B (en) * | 2022-03-08 | 2024-01-23 | 常州工学院 | Chemical energy-saving rectification system and control device |
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