I centralite production device capable of avoiding material punching

Abstract

The utility model discloses a centralite I production device capable of avoiding material flushing, which comprises a reaction system and a washing system which are connected in sequence, and is characterized in that the washing system is connected with a dehydration system, the dehydration system is connected with a distillation system, and the dehydration system comprises a dehydration reduced pressure distillation kettle, a crude product adding pipeline is arranged at the top end of the dehydration reduced pressure distillation kettle and connected with a washing system, a condensation pipe is arranged at the top end of the dehydration reduced pressure distillation kettle, and the receiving end of the condensation pipe is connected with a collecting tank. According to the utility model, low-temperature dehydration operation is carried out before distillation, and a small amount of water and N-ethylaniline in a crude product are removed, so that on one hand, the later-stage distillation efficiency is improved, and material flushing caused by sudden boiling of water when the crude product enters the distillation kettle is avoided.

Description

Technical Field

[0001] The utility model relates to a production device of No. Ⅰ centralite for avoiding material flushing, belonging to the field of chemical production. Background Technique

[0002] No. Ⅰ centralite, with the Chinese name of N-ethyl-N,N'-diphenylurea and a boiling point of 411.52 °C, is used for producing propellant, as a stabilizer for smokeless powder, explosive, nitrided compound and smokeless fuel, and also as an intermediate for fine chemicals. At present, the synthesis of No. Ⅰ centralite is obtained by reacting N-ethylaniline with phosgene in an alkaline medium, then adding water to cool down, stirring, and precipitating the product. Then, it is filtered to remove the sodium chloride aqueous solution. The crude product obtained by filtration is added into a distillation kettle for distillation to obtain the product, and the residual liquid in the distillation kettle is collected into a residual liquid barrel for hazardous waste treatment. Since the crude product contains a small amount of water and N-ethylaniline after water washing, and N-ethyl-N,N'-diphenylurea has a high boiling point, during distillation, the heating temperature is high, and the crude product directly enters the distillation kettle for distillation. Due to the sudden boiling of water, material flushing occurs. Content of the Utility Model

[0003] Aiming at the above technical problems, the purpose of the utility model is to provide a production device of No. Ⅰ centralite for avoiding material flushing.

[0004] In order to achieve the above purpose, the technical solution of the utility model is: a production device of No. Ⅰ centralite for avoiding material flushing, including a reaction system and a washing system connected in sequence, characterized in that: the washing system is connected with a dehydration system, and the dehydration system is connected with a distillation system, wherein the dehydration system includes a dehydration and vacuum distillation kettle, the top of the dehydration and vacuum distillation kettle is provided with a crude product adding pipeline connected with the washing system, the top of the dehydration and vacuum distillation kettle is provided with a condenser, the receiving end of the condenser is connected with a collection tank, and the dehydration and vacuum distillation kettle is provided with a discharge port connected with the distillation system.

[0005] Dehydration utilizes the boiling point difference of each component in the crude product mixture, heats the crude product to a certain temperature under negative pressure conditions, vaporizes and distills out water and N-ethylaniline with lower boiling points, and cools and condenses them through the condenser to achieve the removal of water and amine in the crude product.

[0006] In the above solution: a vacuum tail pipe is arranged at the receiving end of the condenser, the receiving end of the vacuum tail pipe is connected with the collection tank, and a vacuum pipe is connected to the vacuum tail pipe.

[0007] In the above solution: The reaction system includes a reaction kettle, a stirring device is arranged inside the reaction kettle, an N-ethylaniline adding pipeline, an alkali solution adding pipeline, a phosgene adding pipeline and a tail gas pipeline are arranged on the reaction kettle, the tail gas pipeline is connected to a tail gas buffer tank, a tail gas recovery pipeline is arranged on the tail gas buffer tank and connected to the inside of the reaction kettle, and a tail gas pipeline is also arranged on the tail gas buffer tank and connected to a tail gas destruction system;

[0008] An outlet is arranged on the reaction kettle.

[0009] In the above solution: The washing system includes a washing tank, the outlet of the reaction kettle is connected to the inlet of the washing tank, a heat preservation interlayer is arranged outside the washing tank, a stirring device is arranged inside the washing tank, a waste water pipe is arranged at the bottom outlet of the washing tank and connected to a waste water storage tank, a hot water adding pipeline is arranged at the top of the washing tank, and an organic phase pipeline is also arranged at the bottom of the washing tank and connected to the crude product adding pipeline of a dehydration and vacuum distillation kettle.

[0010] In the above solution: The phosgene adding pipeline extends to the inner bottom of the reaction kettle, the N-ethylaniline adding pipeline is connected to an N-ethylaniline storage tank, a pump, a flow meter and an automatic control valve are arranged on the N-ethylaniline adding pipeline, the alkali solution adding pipeline is connected to an alkali solution storage tank, a pump, a flow meter and an automatic control valve are also arranged on the alkali solution adding pipeline, the phosgene adding pipeline is connected to a phosgene buffer tank, and a flow meter and an automatic control valve are arranged on the phosgene adding pipeline. Through the flow meter and the automatic control valve, automatic feeding is controlled, the labor of workers for feeding is reduced, and the production efficiency is improved.

[0011] In the above solution: The distillation system includes a distillation kettle, a residual liquid discharge pipeline is arranged at the bottom of the distillation kettle, and a valve is arranged on the residual liquid discharge pipeline. The distillation kettle is a prior art.

[0012] Beneficial effects: Before distillation, the present utility model first performs a low-temperature dehydration operation to remove a small amount of water and N-ethylaniline in the crude product. On the one hand, the later distillation efficiency is improved, and the material flushing caused by the sudden boiling of water when the crude product enters the distillation kettle is prevented. Description of the Drawings

[0013] Figure 1 It is a structural schematic diagram of the present utility model. Detailed Embodiments

[0014] The present utility model will be further described below through embodiments in combination with the drawings:

[0015] Example 1, as Figure 1 shown, the No. 1 middle stabilizer production device for avoiding material flushing is composed of a reaction system, a washing system, a dehydration system and a distillation system connected in sequence.

[0016] The reaction system includes a reaction kettle 1, in which a stirring device is provided. On the reaction kettle 1, there are pipelines for adding N-ethylaniline, lye, phosgene, and a tail gas pipeline. Among them, the phosgene adding pipeline extends to the bottom inside the reaction kettle 1. The N-ethylaniline adding pipeline is connected to the N-ethylaniline storage tank 4, and on the N-ethylaniline adding pipeline, there are a pump 5, a flowmeter 6, and an automatic control valve 7. The lye adding pipeline is connected to the lye storage tank 9, and on the lye adding pipeline, there are also a pump 5, a flowmeter 6, and an automatic control valve 7. The phosgene adding pipeline is connected to the phosgene buffer tank 8, and on the phosgene adding pipeline, there are a flowmeter 6 and an automatic control valve 7.

[0017] The tail gas pipeline is connected to the tail gas buffer tank 10. On the tail gas buffer tank 10, there is a tail gas recovery pipeline connected to the inside of the reaction kettle 1, and there is also a tail gas pipeline on the tail gas buffer tank 10 connected to the tail gas destruction system. The tail gas destruction system includes a hydrogen chloride absorption device, a water destruction tower, and an alkali destruction tower connected in sequence. The alkali destruction tower is connected to the exhaust air system, and in the exhaust air system, there is an ammonia injection nozzle to perform ammonia injection treatment on the passing tail gas. Automatic control valves are provided on both the tail gas recovery pipeline and the tail gas pipeline. This is the prior art.

[0018] On the reaction kettle 1, there is a discharge port. The discharge port can be set at the bottom of the reaction kettle 1 or at the top of the reaction kettle 1. If it is set at the top, a pressure-feeding nitrogen pipeline is added, and the material is discharged by nitrogen pressure.

[0019] The washing system includes a washing tank 2. Outside the washing tank 2, there is a heat preservation interlayer, and a heating medium can be introduced into the heat preservation interlayer. Inside the washing tank 2, there is a stirring device. At the bottom discharge port of the washing tank 2, there is a wastewater pipe connected to the wastewater storage tank 15. At the top of the washing tank 2, there is a hot water adding pipeline for adding hot water for washing. At the bottom of the washing tank 2, there is also an organic phase pipeline connected to the dehydration system

[0020] The dehydration system includes a dehydration vacuum distillation kettle 11. Inside the dehydration vacuum distillation kettle 11, a stirring structure can be provided. At the top of the dehydration vacuum distillation kettle 11, there is a crude product adding pipeline, and the crude product adding pipeline is connected to the organic phase pipeline of the washing tank 2. At the top of the dehydration vacuum distillation kettle 11, there is a condenser 12, and the receiving end of the condenser 12 is connected to the collection tank 16. Preferably, a vacuum tail pipe 13 is provided at the receiving end of the condenser 12, the receiving end of the vacuum tail pipe 13 is connected to the collection tank 16, and a vacuum pipe 14 is connected to the vacuum tail pipe 13. On the dehydration vacuum distillation kettle 11, there is a discharge port connected to the distillation system. The discharge port can be set at the bottom of the dehydration vacuum distillation kettle 11 or at the top of the reaction kettle 1. If it is set at the top, a pressure-feeding nitrogen pipeline is added, and the material is discharged by nitrogen pressure.

[0021] The distillation system includes a distillation still 3, which can be a tower distillation still and is internally provided with packing. This is prior art and will not be elaborated here. The distillation still 3 can be connected to a vacuum tube to perform vacuum distillation to reduce the distillation temperature. A residual liquid discharge pipeline is provided at the bottom of the distillation still 3, and a valve is provided on this residual liquid discharge pipeline.

[0022] The present utility model is not limited to the above embodiments. Those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A No. Ⅰ medium-fixing agent production device for avoiding material impact, comprising a reaction system and a washing system connected in sequence, characterized in that: The washing system is connected to the dehydration system, and the dehydration system is connected to the distillation system, wherein the dehydration system includes a dehydration vacuum distillation kettle, a crude product adding pipeline is arranged at the top of the dehydration vacuum distillation kettle and is connected to the washing system, a condenser is arranged at the top of the dehydration vacuum distillation kettle, a receiving end of the condenser is connected to a collecting tank, and a discharge port is arranged on the dehydration vacuum distillation kettle and is connected to the distillation system.

2. The device for producing a No. Ⅰ medium-fixing agent to avoid material impact according to claim 1, characterized in that: A vacuum tail pipe is arranged at the receiving end of the condenser tube, the receiving end of the vacuum tail pipe is connected to the collecting tank, and a vacuum tube is connected to the vacuum tail pipe.

3. The device for producing a No. Ⅰ medium-fixing agent to avoid material impact according to claim 1 or 2, characterized in that: The reaction system comprises a reactor, a stirring device is arranged in the reactor, an N-ethylaniline adding pipeline, an alkali solution adding pipeline, a phosgene adding pipeline and an exhaust pipeline are arranged on the reactor, the exhaust pipeline is connected to an exhaust buffer tank, an exhaust recovery pipeline is arranged on the exhaust buffer tank and connected to the inside of the reactor, and an exhaust pipe is also arranged on the exhaust buffer tank and connected to an exhaust destruction system; The reactor is provided with a discharge port.

4. The device for producing a No. Ⅰ medium-fixing agent to avoid material impact according to claim 3 is characterized in that: The washing system comprises a washing tank, the discharge port of the reactor is connected to the feed port on the washing tank, a heat-insulating interlayer is arranged outside the washing tank, a stirring device is arranged inside the washing tank, a wastewater pipe is arranged at the bottom discharge port of the washing tank and is connected to the wastewater storage tank, a hot water adding pipeline is arranged at the top of the washing tank, and an organic phase pipeline is also arranged at the bottom of the washing tank and is connected to the crude product adding pipeline of the dehydration vacuum distillation kettle.

5. The device for producing a No. Ⅰ medium-fixing agent to avoid material impact according to claim 4, characterized in that: The phosgene addition pipeline extends to the bottom of the reactor, the N-ethylaniline addition pipeline is connected to the N-ethylaniline storage tank, and a pump, a flow meter and an automatic control valve are arranged on the N-ethylaniline addition pipeline, the alkali solution addition pipeline is connected to the alkali solution storage tank, and a pump, a flow meter and an automatic control valve are also arranged on the alkali solution addition pipeline, and the phosgene addition pipeline is connected to the phosgene buffer tank, and a flow meter and an automatic control valve are arranged on the phosgene addition pipeline.

6. The device for producing a No. Ⅰ medium-fixing agent to avoid material impact according to claim 5, characterized in that: The distillation system comprises a distillation kettle, a residual liquid discharge pipeline is arranged at the bottom of the distillation kettle, and a valve is arranged on the residual liquid discharge pipeline.

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