A polyphosphate flame retardant microbubble external circulation reaction system

Abstract

The utility model relates to the technical field of alkyl polyphosphate synthesis equipment, specifically a polyphosphate flame retardant microbubble external circulation reaction system, including a reactor and a storage tank, a coil is installed below the interior of the reactor, a discharge port is provided at the bottom of the reactor, the outside of the discharge port is connected to a liquid pipe through a centrifugal pump, the outer end of the liquid pipe is connected to a venturi tube suction reactor, and the storage tank is connected to the reactor through a feed pipe. In the polyphosphate flame retardant microbubble external circulation reaction system, ethylene oxide can be more evenly dispersed in the liquid phase polyphosphate, thereby greatly increasing the contact area and contact time of the two. The system adopts a venturi tube suction reactor to mix the gas in the reactor with the liquid extracted from the bottom to form fine bubbles, which are then transported back to the reactor. This cycle not only improves the reaction efficiency, but also realizes the reuse of gas-phase ethylene oxide, and reduces the volatilization and waste of ethylene oxide.

Description

Technical Field

[0001] The utility model relates to the technical field of alkyl polyphosphate synthesis equipment, in particular to a polyphosphate flame retardant microbubble external circulation reaction system. Background Art

[0002] In the prior art, ethylene oxide (EO) is transported from a storage tank line via a pipe, and a pump is used to transport the material to a reactor. The EO pipeline in the reactor extends below the liquid surface. Although the material is fed below the liquid surface and dispersed by spiral stirring to react with the liquid phase material, the ethylene oxide and the polyphosphate are not in sufficient contact, resulting in low reaction efficiency, and the reaction temperature is much higher than the boiling point of ethylene oxide. Most of the ethylene oxide is not completely reacted and evaporates to the gas phase space of the reactor. It is difficult for the unreacted gaseous ethylene oxide to continue to react with the liquid phase polyphosphate. The reaction time is long. As the reaction proceeds, the concentration of ethylene oxide will continue to increase, thereby increasing the safety risk. The gaseous ethylene oxide needs to be discharged to the tail gas absorption system at intervals, which wastes raw materials and increases environmental pressure. Utility Model Content

[0003] The purpose of the utility model is to provide a polyphosphate flame retardant microbubble external circulation reaction system to solve the problem proposed in the above background technology that unreacted gas phase ethylene oxide is difficult to continue to react with liquid phase polyphosphate, the reaction time is long, and the concentration of ethylene oxide will continue to increase as the reaction proceeds, thereby increasing the safety risk.

[0004] To achieve the above-mentioned purpose, the utility model provides a polyphosphate flame retardant microbubble external circulation reaction system, including a reactor and a storage tank, a coil is installed at the lower part of the reactor, a discharge port is arranged at the bottom of the reactor, the outside of the discharge port is connected to a liquid pipe through a centrifugal pump, the outer end of the liquid pipe is connected to a venturi tube suction reactor, the storage tank is connected to the reactor through a feed pipe, the gas in the upper part of the reactor is mixed with the liquid extracted from the bottom of the reactor in the venturi tube suction reactor, and fine bubbles are then fed back into the reactor.

[0005] Preferably, a high-pressure air pump is installed on one side outer wall of the storage tank, and the output end of the high-pressure air pump is located above the internal liquid level of the storage tank.

[0006] Preferably, a feeding port is installed on the top of the storage tank.

[0007] Preferably, a plurality of micropores are evenly arranged on the outer wall of the coil, the top end of the coil is connected to an upper connecting pipe, the bottom end of the coil is connected to a lower connecting pipe, the upper connecting pipe is connected to a feed pipe, and the end of the lower connecting pipe is open and equipped with a plug.

[0008] Preferably, a liquid inlet is provided at the top of the Venturi tube suction reactor, a return pipe is connected to the bottom of the Venturi tube suction reactor, a one-way valve is installed on the return pipe, and the one-way valve allows the material in the return pipe to move unidirectionally from top to bottom, and one side of the Venturi tube suction reactor is connected to the top of the reactor through a gas connecting pipe.

[0009] Preferably, a solenoid valve is installed on the gas connecting pipe.

[0010] Preferably, one end of the feed pipe extends into the bottom of the storage tank.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] In the polyphosphate flame retardant microbubble external circulation reaction system, a microporous spraying effect is formed inside the reactor through the design of the coil structure, so that ethylene oxide can be more evenly dispersed in the liquid phase polyphosphate, thereby greatly increasing the contact area and contact time between the two, effectively promoting the reaction, and significantly improving the reaction efficiency. The system uses a venturi tube suction reactor to mix the gas in the reactor with the liquid extracted from the bottom to form fine bubbles, which are then transported back into the reactor. This circulation process not only improves the reaction efficiency, realizes the reuse of gas-phase ethylene oxide, reduces the volatilization and waste of ethylene oxide, but also reduces the concentration of ethylene oxide in the gas phase space, significantly reducing safety risks.

[0013] The design of the high-pressure air pump allows the material in the storage tank to enter the reactor more quickly, while the Venturi tube suction reactor mixes the gas and liquid in the reactor by self-priming, without the need for additional stirring equipment, which simplifies the operation process and reduces the complexity and maintenance cost of the equipment. The system effectively utilizes gaseous ethylene oxide, reduces the waste of raw materials and exhaust emissions, reduces pollution to the environment, and meets the requirements of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the coil pipe in the utility model;

[0016] Figure 3 It is a structural schematic diagram of the Chinese Chiuri tube suction reactor of the utility model.

[0017] The meaning of each number in the figure is:

[0018] 1. Reactor; 11. Discharge port; 12. Centrifugal pump; 2. Storage tank; 21. Feed pipe; 22. High-pressure air pump; 23. Feed port; 3. Coil; 31. Micropore; 32. Upper connecting pipe; 33. Lower connecting pipe; 331. Plug; 4. Liquid pipe; 5. Venturi tube suction reactor; 51. Liquid inlet; 52. Gas connecting pipe; 521. Solenoid valve; 53. Return pipe; 531. One-way valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model provides a polyphosphate flame retardant microbubble external circulation reaction system, such as Figure 1-Figure 3 As shown, it includes a reactor 1 and a storage tank 2, a coil 3 is installed at the bottom of the reactor 1, a discharge port 11 is provided at the bottom of the reactor 1, the outside of the discharge port 11 is connected to the liquid pipe 4 through a centrifugal pump 12, the outer end of the liquid pipe 4 is connected to the venturi tube suction reactor 5, and the storage tank 2 is connected to the reactor 1 through a feed pipe 21. The gas in the upper part of the reactor 1 is mixed with the liquid extracted from the bottom of the reactor 1 in the venturi tube suction reactor 5, and then transported back to the reactor 1 after forming fine bubbles. Through nitrogen pressurization, ethylene oxide is evenly distributed in the liquid phase of the reactor in the form of microbubbles, increasing its contact area with the polyphosphate, thereby improving the mixing degree and reaction efficiency of the two. At the same time, the microporous design on the submerged material pipeline in the reactor ensures the uniform spraying of ethylene oxide, further enhancing the mixing effect. The ethylene oxide that fails to react in time and vaporizes to the gas phase space is recovered from the venturi tube suction reactor by the centrifugal pump in the external circulation system, mixed with the reaction liquid to form fine bubbles and then re-enters the reactor, thus achieving the effective utilization of gas-phase ethylene oxide and avoiding the waste of raw materials. In the venturi tube suction reactor, the gas and liquid in the reactor are fully mixed and dispersed to form extremely fine bubbles. These bubbles greatly increase the contact area between the gas and liquid phases, thereby significantly increasing the reaction rate. The use of nitrogen pressurization and microporous design reduces the need for pump delivery, reduces the complexity of the equipment and the maintenance cost. At the same time, the recovery of gas-phase ethylene oxide through the external circulation system reduces the concentration of ethylene oxide in the gas phase space, effectively reducing safety risks.

[0021] In this embodiment, a high-pressure air pump 22 is installed on the outer wall of one side of the storage tank 2, and the output end of the high-pressure air pump 22 is located above the internal liquid level of the storage tank 2, which is convenient for ventilation into the storage tank 2, so that the material in the storage tank 2 can be delivered into the reactor 1.

[0022] Specifically, a feeding port 23 is installed on the top of the storage tank 2 to facilitate feeding, and the feeding port 23 is usually sealed by a sealing plug.

[0023] Furthermore, a plurality of micropores 31 are evenly arranged on the outer wall of the coil 3, an upper connecting pipe 32 is connected to the top of the coil 3, a lower connecting pipe 33 is connected to the bottom of the coil 3, the upper connecting pipe 32 is connected to the feed pipe 21, and the end of the lower connecting pipe 33 is open and equipped with a plug 331.

[0024] Furthermore, a liquid inlet 51 is provided at the top of the venturi tube suction reactor 5, and a return pipe 53 is connected to the bottom of the venturi tube suction reactor 5. A one-way valve 531 is installed on the return pipe 53. The one-way valve 531 allows the material in the return pipe 53 to move unidirectionally from top to bottom. One side of the venturi tube suction reactor 5 is connected to the top of the reactor 1 through a gas connecting pipe 52.

[0025] Furthermore, a solenoid valve 521 is installed on the gas connecting pipe 52 to facilitate the control of the switch of the gas connecting pipe 52 .

[0026] Furthermore, one end of the material delivery pipe 21 extends into the bottom of the material storage tank 2 , so that the material delivery pipe 21 can fully transport the material in the material storage tank 2 .

[0027] When the polyphosphate flame retardant microbubble external circulation reaction system of the utility model is used, the ethylene oxide in the storage tank 2 is first added into the storage tank 2 through the feed port 23 under the action of the high-pressure air pump 22, and is pressurized by nitrogen. Under the action of pressure, the ethylene oxide is transported to the coil 3 in the reactor 1 through the feed pipe 21. The outer wall of the coil 3 is evenly provided with a plurality of micropores 31. When the ethylene oxide enters the coil 3, it will be evenly sprayed in the liquid phase of the reactor 1 in the form of microbubbles through the micropores 31.

[0028] The microbubble-shaped ethylene oxide greatly increases the contact area between the ethylene oxide and the polyphosphate, thereby improving the mixing degree and reaction efficiency of the two. Meanwhile, the stirring device in the reactor 1 further promotes the mixing of the reaction liquid, and the stirring device is a conventional structure of the existing reactor 1 and is not shown in the drawings of this application.

[0029] As the reaction proceeds, part of the ethylene oxide fails to react in time and vaporizes into the gas phase space. At this time, the centrifugal pump 12 starts to work, extracts the reaction liquid from the bottom of the reactor 1 through the discharge port 11, and transports it to the venturi suction reactor 5 through the liquid pipe 4.

[0030] In the venturi tube suction reactor 5, the gas in the upper part of the reactor 1 is sucked in through the gas connection pipe 52 and mixed with the reaction liquid. The special structure of the venturi tube suction reactor 5 allows the gas and liquid to form extremely fine bubbles during the mixing process, further increasing the contact area between the gas and liquid phases, thereby significantly increasing the reaction rate.

[0031] The mixed materials are transported back to the reactor 1 through the return pipe 53 to continue to participate in the reaction. The one-way valve 531 ensures that the materials can only flow in one direction, thereby preventing the materials from flowing back.

[0032] During the whole reaction process, the electromagnetic valve 521 controls the switch of the gas pipe 52, and the gas intake amount can be adjusted as needed. At the same time, the feeding port 23 at the top of the storage tank 2 is sealed by a sealing plug after the feeding is completed to ensure the airtightness of the reaction system.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A polyphosphate flame retardant microbubble external circulation reaction system, comprising a reaction kettle (1) and a storage tank (2), characterized in that: A coil (3) is installed at the lower part of the reactor (1), and a discharge port (11) is provided at the bottom of the reactor (1). The outside of the discharge port (11) is connected to a liquid pipe (4) via a centrifugal pump (12), and the outer end of the liquid pipe (4) is connected to a venturi tube suction reactor (5). The storage tank (2) is connected to the reactor (1) via a feed pipe (21), and the gas in the upper part of the reactor (1) is mixed with the liquid extracted from the bottom of the reactor (1) in the venturi tube suction reactor (5), and then transported back to the reactor (1) after forming fine bubbles.

2. The polyphosphate flame retardant microbubble external circulation reaction system according to claim 1, characterized in that: A high-pressure air pump (22) is installed on one side outer wall of the storage tank (2), and the output end of the high-pressure air pump (22) is located above the internal liquid level of the storage tank (2).

3. The polyphosphate flame retardant microbubble external circulation reaction system according to claim 2, characterized in that: A feeding port (23) is installed on the top of the storage tank (2).

4. The polyphosphate flame retardant microbubble external circulation reaction system according to claim 1, characterized in that: The outer wall of the coil (3) is evenly provided with a plurality of micropores (31); the top end of the coil (3) is connected to an upper connecting pipe (32); the bottom end of the coil (3) is connected to a lower connecting pipe (33); the upper connecting pipe (32) is connected to a feed pipe (21); the end of the lower connecting pipe (33) is open and is provided with a plug (331).

5. The polyphosphate flame retardant microbubble external circulation reaction system according to claim 1, characterized in that: The top of the Venturi tube suction reactor (5) is provided with a liquid inlet (51), the bottom of the Venturi tube suction reactor (5) is connected to a return pipe (53), a one-way valve (531) is installed on the return pipe (53), and the one-way valve (531) allows the material in the return pipe (53) to move unidirectionally from top to bottom. One side of the Venturi tube suction reactor (5) is connected to the top of the reactor (1) through a gas connecting pipe (52).

6. The polyphosphate flame retardant microbubble external circulation reaction system according to claim 5, characterized in that: The gas connecting pipe (52) is provided with a solenoid valve (521).

7. The polyphosphate flame retardant microbubble external circulation reaction system according to claim 1, characterized in that: One end of the material delivery pipe (21) extends into the bottom of the material storage tank (2).

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