A continuous refining and purifying cooling system for cyanuric acid crude

Abstract

This utility model discloses a continuous refining, purification, and cooling system for crude cyanuric acid, comprising a crude product conveying pipeline, several reactors connected in series, several cooling reactors connected in series, a steam conveying pipeline, a compressed gas conveying pipeline, and a circulating cooling water conveying pipeline. The outlet of the crude product conveying pipeline is connected to the inlet of the first reactor, and the outlet of the last reactor is connected to the inlet of the first cooling reactor. The outlet of the steam conveying pipeline is connected to the inlet of the jacket of each reactor. The outlet of the compressed gas conveying pipeline is connected to the inlet of the cooling reactor. The outlet of the circulating cooling water conveying pipeline is connected to the inlet of the jacket of each cooling reactor. Beneficial effects: This utility model discloses a continuous refining, purification, and cooling system for crude cyanuric acid, which improves the service life of the equipment, increases the yield of cyanuric acid, reduces the frequency of pipeline blockage, ensures normal production operation, achieves automatic control, and simplifies the operation process.

Description

Technical Field

[0001] This utility model patent belongs to the field of cyanuric acid production technology, specifically relating to a continuous refining, purification and cooling system for crude cyanuric acid. Background Technology

[0002] In the chemical industry, cyanuric acid, as an important organic chemical raw material, is widely used in pharmaceuticals, pesticides, dyes, and polymer materials. Currently, the production process of cyanuric acid adopts an intermittent production method. For example, the patent application number CN201810069514.0, entitled "A Method for Refining Cyanuric Acid Production," discloses the following steps: Step 1: Raw material addition. 3.6 tons of mother liquor are pumped in using a mother liquor pump, and 1.8 tons of crude cyanuric acid are added to the reactor using a crane. Stirring is started, and the sulfuric acid content of the liquid is adjusted to 23-25%. The reactor lid is then closed. Step 2: Steam heating is initiated for the reaction. Step 3: Cooling is achieved by pressurizing room temperature cooling water through a feed water pump and sending it into the reactor jacket to cool the material inside the reactor. Step 4: Discharge is performed by opening the discharge valve and placing the material into a filtration tank lined with filter cloth through the discharge pipe. Step 5: Filtration is performed. Step 6: Washing and filtration are performed. Step 7: Centrifugation is performed. Step 8: Drying is performed. The above refining method has the following problems: 1. The reaction is first carried out in the reactor by heating it to a high temperature of 130°C with steam, and then the temperature is lowered to below 68°C. The enamel-lined reactor is prone to thermal stress damage, which reduces the service life of the equipment; 2. In the above method, the temperature inside the reactor can be lowered to 68°C. Due to the high discharge temperature, some cyanuric acid dissolves in the mother liquor after filtration, resulting in a low cyanuric acid yield, increased product cost, and precipitation of the cyanuric acid dissolved in the mother liquor during subsequent storage and transportation, which can block pipelines and affect the normal operation of production; 3. The intermittent feeding and discharging operation of the above reactor is cumbersome and discontinuous. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a continuous refining, purification and cooling system for crude cyanuric acid that improves equipment lifespan, increases cyanuric acid yield, and achieves automatic control.

[0004] This utility model discloses a continuous refining and cooling system for crude cyanuric acid, comprising a crude product conveying pipeline, several reactors connected in series, several cooling reactors connected in series, a steam conveying pipeline, a compressed gas conveying pipeline, and a circulating cooling water conveying pipeline; the outlet of the crude product conveying pipeline is connected to the inlet of the first reactor, and the outlet of the last reactor is connected to the inlet of the first cooling reactor; the outlet of the steam conveying pipeline is connected to the inlet of the jacket of each reactor; the outlet of the compressed gas conveying pipeline is connected to the inlet of the cooling reactor; and the outlet of the circulating cooling water conveying pipeline is connected to the inlet of the jacket of each cooling reactor.

[0005] Furthermore, a liquid level sensor is installed in each of the reaction vessels and each of the cooling vessels, and a regulating valve is installed at the inlet of each of the reaction vessels and each of the cooling vessels. The signal output terminal of each liquid level sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of each of the regulating valves.

[0006] Furthermore, a first temperature sensor is installed in each of the reactors, and a solenoid valve is installed at the air inlet of the jacket of each reactor. The signal output terminal of each first temperature sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of each solenoid valve.

[0007] Furthermore, a second temperature sensor is provided in each of the cooling vessels, and a control valve is provided at the water inlet of the jacket of each cooling vessel. The signal output terminal of each second temperature sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of each control valve.

[0008] Furthermore, a pressure sensor is installed in the last reaction vessel and each of the cooling vessels; a valve is installed at the air inlet of each cooling vessel; the signal output terminal of each pressure sensor is connected to the signal input terminal of the controller; and the signal output terminal of the controller is connected to the signal input terminal of each valve.

[0009] Advantages of this utility model: 1. This utility model discloses a continuous refining and purification cooling system for crude cyanuric acid. The crude cyanuric acid is refined and purified sequentially through several reactors connected in series. After purification, it is then cooled sequentially through several cooling reactors until it reaches a temperature between 55-60°C before being discharged. The reactors only require high-temperature refining, avoiding thermal stress damage and extending the equipment's lifespan. Simultaneously, the cooling process to 55-60°C through several cooling reactors ensures the material does not become viscous due to low temperature. Therefore, while ensuring normal material flow, it also achieves effective separation of cyanuric acid from the mother liquor, increasing the yield of cyanuric acid, reducing the frequency of pipe blockage, and ensuring normal production operation.

[0010] 2. The present invention discloses a continuous refining, purification and cooling system for crude cyanuric acid, which realizes automatic control. By controlling the amount of compressed air entering each cooling vessel, and then controlling the pressure difference between the vessels, continuous refining, purification and cooling is achieved. The operation process is simple. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the control structure of this utility model.

[0014] 1. Crude product conveying pipeline, 2. Reactor, 3. Cooling vessel, 4. Steam conveying pipeline, 5. Compressed gas conveying pipeline, 6. Circulating cooling water conveying pipeline, 7. Liquid level sensor, 8. Regulating valve, 9. Controller, 10. First temperature sensor, 11. Solenoid valve, 12. Second temperature sensor, 13. Control valve, 14. Pressure sensor, 15. Valve. Detailed Implementation

[0015] The present invention will be further described in detail below through embodiments.

[0016] Example: Figure 1-2As shown, a continuous refining and purification cooling system for crude cyanuric acid includes a crude product conveying pipeline 1, three reactors 2 connected in series, three cooling reactors 3 connected in series, a steam conveying pipeline 4, a compressed gas conveying pipeline 5, and a circulating cooling water conveying pipeline 6. The outlet of the crude product conveying pipeline 1 is connected to the inlet of the first reactor 2, and the outlet of the last reactor 2 is connected to the inlet of the first cooling reactor 3. The outlet of the steam conveying pipeline 4 is connected to the inlet of the jacket of each reactor 2. The outlet of the compressed gas conveying pipeline 5 is connected to the inlet of the jacket of each cooling reactor 3. The outlet of the circulating cooling water conveying pipeline 6 is connected to the inlet of the jacket of each cooling reactor 3.

[0017] A liquid level sensor 7 is installed in each reactor 2 and each cooling reactor 3. A regulating valve 8 is installed at the feed inlet of each reactor 2 and each cooling reactor 3. The signal output terminal of each liquid level sensor 7 is connected to the signal input terminal of the controller 9 through a signal connection. The signal output terminal of the controller 9 is connected to the signal input terminal of each regulating valve 8 through a signal connection.

[0018] A first temperature sensor 10 is installed in each reactor 2, and a solenoid valve 11 is installed at the air inlet of the jacket of each reactor 2. The signal output terminal of each first temperature sensor 10 is connected to the signal input terminal of the controller 9 through a signal connection. The signal output terminal of the controller 9 is connected to the signal input terminal of each solenoid valve 11 through a signal connection.

[0019] A second temperature sensor 12 is installed in each cooling vessel 3, and a control valve 13 is installed at the water inlet of the jacket of each cooling vessel 3. The signal output terminal of each second temperature sensor 12 is connected to the signal input terminal of the controller 9 through a signal connection. The signal output terminal of the controller 9 is connected to the signal input terminal of each control valve 13 through a signal connection.

[0020] Pressure sensors 14 are installed in the last reaction vessel 2 and each cooling vessel 3; valves 15 are installed at the air inlet of each cooling vessel 3; the signal output terminal of each pressure sensor 14 is connected to the signal input terminal of the controller 9 via signal connection; and the signal output terminal of the controller 9 is connected to the signal input terminal of each valve 15 via signal connection.

[0021] Working Principle: Crude cyanuric acid is conveyed to the first reactor 2 via crude product conveying pipeline 1. Steam is simultaneously introduced into all three reactors 2 via steam pipeline for heating. As the material in the first reactor 2 increases, steam heating further refines and purifies the product. Gas is generated in the material, increasing the pressure in the first reactor 2. The material at the bottom of the first reactor 2 is then conveyed to the second reactor 2, and similarly, the material at the bottom of the second reactor 2 is conveyed to the third reactor 2. This process of refining and purifying occurs sequentially through the three reactors 2. Each first temperature sensor 10 continuously monitors the temperature in its corresponding reactor 2 and transmits the signal to the controller 9. The controller 9 adjusts the solenoid valve 11 at the air inlet of the jacket of the corresponding reactor 2 to maintain the temperature in that reactor 2 at approximately 135°C. Next, compressed air is introduced into the three cooling reactors 3. Pressure sensors 14 in the third reactor 2 and the three cooling reactors 3 continuously monitor the pressure in their respective reactors and transmit the signal to the controller 9. The controller 9 adjusts the valve 15 at the air inlet of the corresponding cooling reactor 3 to control the pressure in the third reactor 2 and the first cooling reactor 3. The pressure difference between the two reactors is 50-60 kPa, and the pressure difference between adjacent cooling reactors 3 is also 50-60 kPa. The pressure decreases sequentially from the third reactor 2 to the third cooling reactor 3, realizing that the purified material in the third reactor 2 is cooled sequentially through the three cooling reactors 3. Each second temperature sensor 12 monitors the temperature in the corresponding cooling reactor 3 at all times and transmits the signal to the controller 9. The controller 9 adjusts the control valve 13 at the inlet of the jacket of the corresponding cooling reactor 3 to maintain the temperature in the first cooling reactor 3 at 80-90℃. The temperature inside the second cooling vessel 3 is maintained at 60-80℃, and the temperature inside the third cooling vessel 3 is maintained at 55-60℃. Finally, the product is discharged. Reactor 2 only needs to undergo high-temperature refining and purification, avoiding thermal stress damage and improving the service life of the equipment. At the same time, the material is cooled to 55-60℃ through several cooling vessels 3, ensuring that the material does not become viscous due to the low temperature. Therefore, while ensuring the normal flow of the material, cyanuric acid is effectively separated from the mother liquor, improving the yield of cyanuric acid, reducing the frequency of pipe blockage, and ensuring the normal operation of production.

[0022] The liquid level sensor 7 in each vessel constantly monitors the liquid level in the corresponding vessel and transmits the signal to the controller 9. The controller 9 adjusts the regulating valve 8 at the feed inlet of the corresponding vessel to ensure that the liquid level in each vessel is controlled at about 1800 mm.

[0023] This utility model has a simple and easy-to-implement connection structure and achieves automatic control. By controlling the amount of compressed air entering each cooling vessel 3, and then controlling the pressure difference between the vessels, continuous refining, purification and cooling are achieved. The operation process is simple.

[0024] The above are preferred embodiments of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A continuous purification and cooling system for crude cyanuric acid, characterized in that, It includes a crude product conveying pipeline, several reactors connected in series, several cooling reactors connected in series, a steam conveying pipeline, a compressed gas conveying pipeline, and a circulating cooling water conveying pipeline; the outlet of the crude product conveying pipeline is connected to the inlet of the first reactor, the outlet of the last reactor is connected to the inlet of the first cooling reactor, the outlet of the steam conveying pipeline is connected to the inlet of the jacket of each reactor, the outlet of the compressed gas conveying pipeline is connected to the inlet of the cooling reactor, and the outlet of the circulating cooling water conveying pipeline is connected to the inlet of the jacket of each cooling reactor.

2. The continuous refining and cooling system for crude cyanuric acid according to claim 1, characterized in that, A liquid level sensor is installed in each of the reaction vessels and each of the cooling vessels, and a regulating valve is installed at the inlet of each of the reaction vessels and each of the cooling vessels. The signal output terminal of each liquid level sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of each of the regulating valves.

3. The continuous refining and cooling system for crude cyanuric acid according to claim 2, characterized in that, A first temperature sensor is installed in each of the reactors, and a solenoid valve is installed at the air inlet of the jacket of each reactor. The signal output terminal of each first temperature sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of each solenoid valve.

4. The continuous refining and cooling system for crude cyanuric acid according to claim 3, characterized in that, A second temperature sensor is installed in each of the cooling vessels, and a control valve is installed at the water inlet of the jacket of each cooling vessel. The signal output terminal of each second temperature sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of each control valve.

5. The continuous refining and cooling system for crude cyanuric acid according to claim 4, characterized in that, Pressure sensors are installed in the last reactor and each of the cooling reactors; valves are installed at the air inlets of each cooling reactor; the signal output terminal of each pressure sensor is connected to the signal input terminal of the controller; and the signal output terminal of the controller is connected to the signal input terminal of each valve.

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