Reduction system

Abstract

The application discloses a reduction system, comprising a reaction mechanism, a cooling mechanism and a liquid supply mechanism. The reaction mechanism is used for reacting phosphorus trichloride and hydrogen to generate yellow phosphorus and hydrochloric acid; the cooling mechanism comprises a cooling tank and a gas inlet pipe, the cooling tank is provided with a first input port, a second input port, an overflow port and a discharge port, and the output end of the reaction mechanism is communicated with the first input port; the gas inlet pipe is arranged in the cooling tank, one end of the gas inlet pipe is communicated with the first input port, and the horizontal height of the other end is lower than that of the overflow port; the liquid supply mechanism is communicated with the second input port and is used for supplying pure water. The gaseous yellow phosphorus generated by reducing the phosphorus trichloride is input into the cooling tank, the gaseous yellow phosphorus is input into the pure water in the cooling tank through the gas inlet pipe, and is cooled into liquid state. The liquid yellow phosphorus is accumulated at the bottom of the cooling tank and can be discharged from the discharge port for collection. In this way, the reduction system can cool the gaseous yellow phosphorus generated by reaction into liquid state and collect the gaseous yellow phosphorus, so that the storage and transportation of the yellow phosphorus are facilitated.

Description

Technical Field

[0001] This application belongs to the field of phosphorus trichloride reduction technology, specifically relating to a reduction system. Background Technology

[0002] Phosphorus trichloride is an inorganic compound, a colorless and transparent liquid at room temperature, and is highly corrosive. It is miscible with carbon disulfide, diethyl ether, carbon tetrachloride, benzene, etc. The reduction reaction of phosphorus trichloride can prepare elemental phosphorus, but because the Gibbs free energy of the reduction of phosphorus trichloride to yellow phosphorus is high, a relatively high temperature is required to ensure the reaction is complete. Therefore, after reducing yellow phosphorus with phosphorus trichloride, the yellow phosphorus is in a gaseous state, which is inconvenient for storage and transportation. Utility Model Content

[0003] The technical problem to be solved by this application is that the existing method of reducing phosphorus trichloride to gaseous yellow phosphorus makes gaseous yellow phosphorus inconvenient to store and transport. In order to solve this technical problem, a reduction system that can reduce phosphorus trichloride to yellow phosphorus and facilitate the storage and transportation of yellow phosphorus is provided.

[0004] The technical solution proposed in this application is as follows:

[0005] A restoration system, comprising:

[0006] The reaction mechanism is used to react phosphorus trichloride and hydrogen gas to produce yellow phosphorus and hydrochloric acid;

[0007] A cooling mechanism includes a cooling tank and an air inlet pipe. The cooling tank has a first inlet, a second inlet, an overflow outlet, and a discharge outlet. The first inlet and the second inlet are located at the top of the cooling tank. The overflow outlet is located on the side of the cooling tank, and the discharge outlet is located at the bottom of the cooling tank. The output end of the reaction mechanism is connected to the first inlet. The air inlet pipe is disposed inside the cooling tank, with one end connected to the first inlet and the other end at a horizontal height lower than the overflow outlet.

[0008] The liquid supply mechanism is connected to the second inlet and is used to supply pure water.

[0009] Using the reduction system described above, the gaseous yellow phosphorus produced by the reduction of phosphorus trichloride is fed into a cooling tank, and then into pure water within the tank through an inlet pipe, where it is liquefied by the cooling water. The liquid yellow phosphorus accumulates at the bottom of the cooling tank and can be discharged and collected from the discharge port. In this way, the reduction system can reduce phosphorus trichloride to yellow phosphorus and cool the gaseous yellow phosphorus produced in the reaction into a liquid state for collection, thus facilitating the storage and transportation of yellow phosphorus.

[0010] Furthermore, the cooling mechanism includes multiple cooling tanks and multiple air inlet pipes, with each air inlet pipe corresponding to one of the multiple cooling tanks; the cooling mechanism also includes connecting pipes.

[0011] The top of the cooling tank is also provided with an exhaust port. The connecting pipe is located between two adjacent cooling tanks, with one end connected to the exhaust port of one of the cooling tanks and the other end connected to the first inlet of the other cooling tank.

[0012] Furthermore, the cooling tank is provided with a baffle plate connected to the side wall of the cooling tank to form an overflow cavity with the side wall of the cooling tank facing downward. The overflow cavity is connected to the overflow port, and the horizontal height of the opening of the overflow cavity is lower than the horizontal height of the overflow port.

[0013] Furthermore, the cooling mechanism also includes an exhaust pipe and an insulation sleeve. One end of the exhaust pipe is connected to the reaction mechanism, and the other end is connected to the first input port. The insulation sleeve covers the exhaust pipe and the outside of the cooling tank.

[0014] Furthermore, the reaction mechanism includes a reaction tube and a heating sleeve. The reaction tube is used to supply phosphorus trichloride and hydrogen for reaction. The output end of the reaction tube is connected to the first input port. The heating sleeve covers the outside of the reaction tube.

[0015] Furthermore, the reaction mechanism also includes a heat insulation layer, which covers the outside of the heating jacket.

[0016] Furthermore, two porous baffles are spaced apart along the length of the reaction tube, and a packing material is provided between the two porous baffles.

[0017] Furthermore, the reaction tube has an air inlet and a feed inlet at the end away from the cooling mechanism; the reduction system also includes a gas supply mechanism and a feed mechanism, the gas supply mechanism is connected to the air inlet and can alternately supply nitrogen and hydrogen, and the feed mechanism is connected to the feed inlet and can supply phosphorus trichloride.

[0018] Furthermore, the gas supply mechanism includes a first gas inlet assembly, a second gas inlet assembly, and a switching valve. Both the first gas inlet assembly and the second gas inlet assembly are connected to the gas inlet through the switching valve. The first gas inlet assembly is used to input nitrogen gas, and the second gas inlet assembly is used to input hydrogen gas. The switching valve is used to allow the first gas inlet assembly and the second gas inlet assembly to alternately connect to the gas inlet.

[0019] Furthermore, the gas supply mechanism also includes a flame arrester and a pressure detector, both of which are located between the switching valve and the reaction tube.

[0020] In summary, the restoration system provided in this application has at least the following advantages:

[0021] 1. The gaseous yellow phosphorus produced by the reaction mechanism can be cooled into liquid yellow phosphorus by pure water in the cooling tank. The liquid yellow phosphorus accumulates at the bottom of the cooling tank and can be discharged through the discharge port at the bottom, which facilitates the storage and transportation of yellow phosphorus.

[0022] 2. The cooling mechanism includes multiple cooling tanks connected in series to achieve multiple collections of gaseous yellow phosphorus and improve the collection rate of yellow phosphorus;

[0023] 3. A baffle is installed at the overflow port of the cooling tank to reduce the amount of gaseous yellow phosphorus discharged from the overflow port and improve the collection rate of yellow phosphorus;

[0024] 4. The gas supply mechanism can alternately supply nitrogen and hydrogen, thereby replacing the air in the reduction system with nitrogen and avoiding the influence of air on the purity of yellow phosphorus;

[0025] 5. The insulation jacket can keep the temperature of the pure water in the cooling tank relatively stable and higher than the melting point of yellow phosphorus, thus ensuring that the yellow phosphorus is cooled into a liquid state in the cooling tank. Attached Figure Description

[0026] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0027] Figure 1 This is a schematic diagram of the structure of a restoration system provided in an embodiment of this application;

[0028] Figure 2 for Figure 1 The diagram shows the structure of the cooling tank in the reduction system.

[0029] Label Explanation:

[0030] 100. Reaction mechanism; 110. Reaction tube; 120. Heating jacket; 130. Branch pipe; 140. Packing material; 200. Cooling mechanism; 210. Cooling tank; 211. First inlet; 212. Second inlet; 213. Overflow port; 214. Discharge port; 215. Exhaust port; 220. Inlet pipe; 230. Outlet pipe; 240. Connecting pipe; 250. Baffle; 260. Insulation jacket; 270. Overflow chamber; 300, gas supply mechanism; 310, first air intake assembly; 320, second air intake assembly; 330, switching valve; 340, flame arrester; 350, pressure detector; 361, gas source; 362, pipeline; 363, pressure reducing valve; 364, pressure relief valve; 365, gas flow meter; 400, feeding mechanism; 410, high-level material tank; 420, discharge valve; 430, discharge pipe; 440, material flow meter. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] This application provides a reduction system for reducing phosphorus trichloride with hydrogen to produce yellow phosphorus and hydrochloric acid. For example... Figure 1 and Figure 2 As shown, in one embodiment, the reduction system includes a reaction mechanism 100, a cooling mechanism 200, and a liquid supply mechanism. The reaction mechanism 100 reacts phosphorus trichloride and hydrogen to produce yellow phosphorus and hydrochloric acid. Due to the high reaction temperature, both the yellow phosphorus and hydrochloric acid produced are gaseous. The cooling mechanism 200 is located downstream of the reaction mechanism 100 and works in conjunction with the liquid supply mechanism to cool the gaseous yellow phosphorus, condensing it into a liquid state for easier storage and transportation.

[0034] Furthermore, the cooling mechanism 200 includes a cooling tank 210 and an air inlet pipe 220. The cooling tank 210 has a first inlet 211, a second inlet 212, an overflow port 213, and a discharge port 214. The first inlet 211 and the second inlet 212 are both located at the top of the cooling tank 210, the overflow port 213 is located on the side of the cooling tank 210, and the discharge port 214 is located at the bottom of the cooling tank 210. The output end of the reaction mechanism 100 is connected to the first inlet 211, thereby allowing gaseous yellow phosphorus and hydrochloric acid to be input into the cooling tank 210 through the first inlet 211. The liquid supply mechanism is connected to the second inlet 212 to provide pure water, that is, pure water is input into the cooling tank 210 through the second inlet 212. The air inlet pipe 220 is disposed inside the cooling tank 210, with one end connected to the first inlet 211 and the other end at a horizontal height lower than the overflow port 213.

[0035] Understandably, the liquid supply mechanism inputs pure water into the cooling tank 210, and the level of the pure water is limited by the overflow port 213, meaning the level of the pure water is at the same level as the overflow port 213. The end of the air inlet pipe 220 furthest from the first inlet port 211 (hereinafter referred to as the bottom end) is at a lower level than the overflow port 213, meaning the bottom end of the air inlet pipe 220 is submerged in the pure water. Thus, the gaseous yellow phosphorus and hydrochloric acid generated by the reaction mechanism 100 enter the air inlet pipe 220 through the first inlet port 211, and then enter the pure water. It can also be determined that the temperature of the pure water is lower than the boiling point of the yellow phosphorus, so the yellow phosphorus entering the pure water will be cooled into a liquid state. Since the density of liquid yellow phosphorus is greater than that of pure water, the liquid yellow phosphorus will accumulate at the bottom of the cooling tank 210 and be discharged through the discharge port 214 at the bottom.

[0036] It should be explained that in this embodiment, the temperature of the pure water is also higher than the melting point of yellow phosphorus. For example, the melting point of yellow phosphorus is 44.1°C and the boiling point is 280°C. The temperature of the pure water can be set to 60°C to ensure that the yellow phosphorus in the pure water remains in a liquid state and accumulates at the bottom of the cooling tank 210.

[0037] Using the reduction system described above, the reaction unit 100 inputs the gaseous yellow phosphorus generated from the reduction of phosphorus trichloride into the cooling tank 210, and also into the pure water inside the cooling tank 210 through the air inlet pipe 220. The gaseous yellow phosphorus is cooled into a liquid state and accumulates at the bottom of the cooling tank 210, while the liquid yellow phosphorus can be discharged and collected from the discharge port 214. In this way, the reduction system can reduce phosphorus trichloride into yellow phosphorus and can cool and collect the gaseous yellow phosphorus generated in the reaction, thereby facilitating the storage and transportation of yellow phosphorus.

[0038] In one embodiment, the reduction system further includes a gas supply mechanism 300 and a feed mechanism 400, both connected to the reaction mechanism 100. The gas supply mechanism 300 can alternately supply nitrogen and hydrogen, while the feed mechanism 400 can supply phosphorus trichloride. Thus, before the reaction, nitrogen can be introduced into the reaction mechanism 100 and the cooling mechanism 200 through the gas supply mechanism 300 to replace the air in the reduction system with nitrogen. Then, hydrogen is introduced through the gas supply mechanism 300, and phosphorus trichloride is supplied into the reaction mechanism 100 through the feed mechanism 400, enabling the reaction of phosphorus trichloride and hydrogen within the reaction mechanism 100.

[0039] In one embodiment, the gas supply mechanism 300 includes a first gas inlet assembly 310, a second gas inlet assembly 320, and a switching valve 330. Both the first gas inlet assembly 310 and the second gas inlet assembly 320 are connected to the reaction mechanism 100 via the switching valve 330. The first gas inlet assembly 310 is used to input nitrogen gas, and the second gas inlet assembly 320 is used to input hydrogen gas. The switching valve 330 is used to allow the first gas inlet assembly 310 and the second gas inlet assembly 320 to alternately connect to the reaction mechanism 100, thereby alternately supplying nitrogen gas and hydrogen gas into the reaction mechanism 100.

[0040] Furthermore, the gas supply mechanism 300 also includes a flame arrester 340 and a pressure detector 350, both of which are disposed between the switching valve 330 and the reaction mechanism 100. The flame arrester 340 prevents heat generated by the reaction mechanism 100 from being transferred to the intake assembly and the switching valve 330, while the pressure detector 350 detects the internal pressure in the reaction mechanism 100, thereby stopping gas input when the pressure is too high. For example, when the pressure detector 350 detects a pressure value of 0.01 MPa, the switching valve 330 closes, isolating the intake assembly and the reaction mechanism 100, stopping gas input, and thus ensuring safety. Therefore, the pressure detector 350 is disposed between the flame arrester 340 and the reaction mechanism 100.

[0041] In one embodiment, both the first intake assembly 310 and the second intake assembly 320 include a gas source 361 and a pipeline 362. The gas source 361 is connected to a switching valve 330 via the pipeline 362. A pressure reducing valve 363, a pressure relief valve 364, and a gas flow meter 365 are sequentially installed on the pipeline 362. The pressure reducing valve 363 controls the gas pressure input to the reaction mechanism 100, while the pressure relief valve 364 can release pressure when the pressure in the pipeline 362 exceeds a pressure relief value (e.g., the pressure relief value is set to 0.01 MPa). The gas flow meter 365 is used to detect the input gas flow rate. It can be determined that the gas source 361 in the first intake assembly 310 is used to provide nitrogen, and the gas source 361 in the second intake assembly 320 is used to provide hydrogen.

[0042] In one embodiment, the feeding mechanism 400 includes a high-level tank 410, a discharge valve 420, and a discharge pipe 430. The discharge end of the high-level tank 410 is connected to the discharge valve 420 to control the discharge of the high-level tank 410. The discharge pipe 430 is connected between the discharge valve 420 and the reaction mechanism 100 to input phosphorus trichloride output from the high-level tank 410 into the reaction mechanism 100. Further, the feeding mechanism 400 also includes a material flow meter 440, which is installed in the discharge pipe 430 to detect the flow rate of phosphorus trichloride input into the reaction mechanism 100, thereby accurately controlling the amount of phosphorus trichloride input into the reaction mechanism 100.

[0043] In one embodiment, the reaction mechanism 100 includes a reaction tube 110 and a heating jacket 120. The reaction tube 110 is used to react phosphorus trichloride and hydrogen gas to generate gaseous yellow phosphorus and gaseous hydrochloric acid within the reaction tube 110. The output end of the reaction tube 110 is connected to a first input port 211, thereby inputting the gaseous yellow phosphorus and hydrochloric acid within the reaction tube 110 into a cooling tank 210. The heating jacket 120 covers the outside of the reaction tube 110 and is used to heat the reaction tube 110, thereby raising the temperature inside the reaction tube 110 to the reaction temperature.

[0044] Furthermore, the reaction mechanism 100 also includes a heat insulation layer, which covers the outside of the heating jacket 120 for heat preservation, preventing excessive heat loss and thus reducing energy consumption. Even further, the reaction mechanism 100 also includes a temperature detector, which detects the temperature of the reaction tube 110, and the heating jacket 120 controls heating based on the detection results of the temperature detector.

[0045] In one embodiment, the reaction tube 110 has an air inlet and a feed inlet at the end furthest from the cooling mechanism 200. The air supply mechanism 300 is connected to the air inlet, i.e., the air intake assembly is connected to the air inlet via a switching valve 330. The feed mechanism 400 is connected to the feed inlet, i.e., the end of the discharge pipe 430 furthest from the high-level tank 410 is connected to the feed inlet. In practical applications, the reaction tube 110 has a branch pipe 130 at the end furthest from the cooling mechanism 200. One end of the branch pipe 130 extends into the reaction tube 110, and the other end branches into two branches, each with an air inlet and a feed inlet, for connecting to the air supply mechanism 300 and the feed mechanism 400, respectively.

[0046] In one embodiment, two porous baffles are spaced apart along the length of the reaction tube 110, with packing material 140 between the two baffles. This extends the transport time of phosphorus trichloride and hydrogen within the reaction tube 110, thereby prolonging the reaction time of phosphorus trichloride and hydrogen. It also increases the contact area between phosphorus trichloride and hydrogen, enhancing the mass transfer conditions between the reactant gases, resulting in a more complete reaction and improving the purity and yield of the product after the reaction.

[0047] In one embodiment, the cooling mechanism 200 further includes an exhaust pipe 230, one end of which is connected to the reaction mechanism 100, specifically to the reaction tube 110, and the other end is connected to the first inlet 211, thereby transporting the gaseous yellow phosphorus and hydrochloric acid generated in the reaction tube 110 to the cooling tank 210.

[0048] In one embodiment, the cooling mechanism 200 includes a plurality of cooling tanks 210 and a plurality of air inlet pipes 220, with each air inlet pipe 220 corresponding to a specific cooling tank 210. Further, the cooling mechanism 200 also includes a connecting pipe 240, and an exhaust port 215 is provided at the top of each cooling tank 210. The connecting pipe 240 is positioned between two adjacent cooling tanks 210, with one end connected to the exhaust port 215 of one cooling tank 210 and the other end connected to the first inlet port 211 of the other cooling tank 210. Specifically, the connecting pipe 240 is connected to the exhaust port 215 of the upstream cooling tank 210 and to the first inlet port 211 of the downstream cooling tank 210.

[0049] It can be determined that the liquid supply mechanism is connected to the second inlet 212 of each cooling tank 210 to supply pure water into each cooling tank 210. Thus, by connecting multiple cooling tanks 210 in series, gaseous yellow phosphorus and hydrochloric acid sequentially pass through multiple cooling tanks 210, further improving the collection rate of gaseous yellow phosphorus. Naturally, the cooling tank 210 connected to the gas outlet pipe 230 has the highest collection rate among the multiple cooling tanks 210.

[0050] Furthermore, a baffle 250 is provided inside the cooling tank 210. The baffle 250 is connected to the side wall of the cooling tank 210 to form an overflow cavity 270 with the side wall of the cooling tank 210 facing downward. The overflow cavity 270 is connected to the overflow port 213, and the horizontal height of the opening of the overflow port 213 is lower than the horizontal height of the overflow port 213.

[0051] Understandably, without baffle 250, overflow port 213 would be directly connected to the space above the pure water. Therefore, unabsorbed gaseous yellow phosphorus entering the space above it via the pure water could be discharged from overflow port 213, affecting the collection rate of yellow phosphorus. However, with baffle 250 installed, the baffle 250 divides the space above the pure water into an overflow chamber 270 and an exhaust chamber. The exhaust chamber is connected to exhaust port 215, and the overflow chamber 270 and the exhaust chamber are separated by pure water, ensuring they are not interconnected. Figure 2 As shown, the volume of the overflow chamber 270 is much smaller than the volume of the exhaust chamber, so that most of the unabsorbed gaseous yellow phosphorus enters the downstream cooling tank 210 through the exhaust port 215, thereby improving the collection rate of yellow phosphorus.

[0052] In one embodiment, the cooling mechanism 200 further includes an insulation jacket 260, which covers the outside of the exhaust pipe 230 and the cooling tank 210 to ensure that the temperature of the exhaust pipe 230 and the cooling tank 210 is below the boiling point of yellow phosphorus. Of course, based on the above description, the insulation jacket 260 also needs to ensure that the temperature inside the exhaust pipe 230 and the cooling tank 210 is not lower than the melting point of yellow phosphorus. Specifically, the insulation jacket 260 uses liquid insulation, and the temperature of the liquid inside the insulation jacket 260 is 60°C to ensure that the temperature of the exhaust pipe 230 and the cooling tank 210 is maintained at 60°C.

[0053] It should be explained that the aforementioned insulation sleeve 260, used to maintain the temperature of the outlet pipe 230 and the cooling tank 210 at a certain temperature, means that under the condition of no reaction and no external interference, the insulation sleeve 260 continuously operates, enabling the outlet pipe 230 and the cooling tank 210 to maintain a certain temperature. If a reaction occurs or other external factors are present, the temperature inside the outlet pipe 230 and the cooling tank 210 will change, but the insulation sleeve 260 can still reduce the magnitude of temperature changes to a certain extent.

[0054] In addition, Figure 1 In the embodiment shown, the outer side of the downstream cooling tank 210 is not covered with an insulation sleeve 260. This is mainly because the temperature of the reactant gas is reduced significantly after two absorptions and cooling processes, so it will not have a significant impact on the temperature of the pure water in the downstream cooling tank 210.

[0055] It is understood that in this embodiment, the temperature of the pure water is regulated by the insulation sleeve 260. In other embodiments, pure water at a certain temperature (e.g., 60°C) can be continuously supplied through a liquid supply mechanism to keep the temperature of the pure water in the cooling tank 210 relatively stable. The supplied pure water continuously overflows through the overflow port 213 to control the liquid level in the cooling tank 210.

[0056] In a preferred embodiment, the exhaust pipe 230 and the insulation sleeve 260 on the cooling tank 210 are connected by a pipe, so that only one liquid inlet is opened on the insulation sleeve 260 at the exhaust pipe 230 and one liquid outlet is opened on the insulation sleeve 260 at one of the cooling tanks 210 to achieve the circulation of coolant.

[0057] To facilitate understanding of the technical solution of this application, this document combines... Figure 1 The process flow of the reduction system in the above embodiments is described as follows:

[0058] Initially, the liquid supply mechanism inputs pure water into the cooling tank 210 until the pure water overflows from the overflow hole. Next, the first air inlet assembly 310 and the reaction tube 110 are connected through the switching valve 330. The first air inlet assembly 310 inputs nitrogen into the reaction tube 110 at a flow rate of 6~8 L / min for 0.5 h to complete the gas replacement of the reduction system. Then, the heating jacket 120 is activated to heat the reaction tube 110, raising the temperature inside the reaction tube 110 to 600~800℃. Simultaneously, the second air inlet assembly 320 and the reaction tube 110 are connected through the switching valve 330. The second air inlet assembly 320 inputs hydrogen into the reaction tube 110 at a flow rate of 10~12 L / min. The discharge valve 420 is opened, and phosphorus trichloride is input into the reaction tube 110 through the discharge pipe 430 at a flow rate of 6~8 L / min.

[0059] Phosphorus trichloride and hydrogen react in reaction tube 110 to produce gaseous yellow phosphorus and gaseous hydrochloric acid. The gaseous yellow phosphorus and hydrochloric acid enter cooling tank 210 through gas outlet pipe 230 and enter pure water under the action of gas inlet pipe 220. The gaseous yellow phosphorus is cooled into liquid yellow phosphorus and accumulates at the bottom of cooling tank 210. The hydrochloric acid can also be dissolved in pure water.

[0060] It should be noted that a discharge valve can also be installed at discharge port 214 to control the discharge of liquid yellow phosphorus. In addition, a very small amount of hydrochloric acid tail gas will be discharged from the exhaust port 215 of the downstream cooling tank 210. This tail gas can be treated by a spray tower.

[0061] In addition, in this embodiment, both the reaction tube 110 and the cooling tank 210 are made of quartz. In order to avoid damage to the reaction tube 110 and the cooling tank 210 due to excessive pressure, the pressure reducing valve 363, the pressure relief valve 364 and the pressure detector 350 mentioned above are provided.

[0062] In summary, the restoration system provided in this application has at least the following advantages:

[0063] 1. The gaseous yellow phosphorus generated by the reaction mechanism 100 enters the cooling tank 210 and can be cooled into liquid yellow phosphorus by pure water. The liquid yellow phosphorus accumulates at the bottom of the cooling tank 210 and can be discharged through the discharge port 214 at the bottom, thus facilitating the storage and transportation of yellow phosphorus.

[0064] 2. The cooling mechanism 200 includes multiple cooling tanks 210 connected in series to achieve multiple collections of gaseous yellow phosphorus and improve the collection rate of yellow phosphorus.

[0065] 3. A baffle 250 is provided at the overflow port 213 of the cooling tank 210 to reduce the gaseous yellow phosphorus discharged from the overflow port 213 and improve the collection rate of yellow phosphorus.

[0066] 4. The gas supply unit 300 can alternately supply nitrogen and hydrogen, thereby replacing the air in the reduction system with nitrogen and avoiding the influence of air on the purity of yellow phosphorus.

[0067] 5. The insulation jacket 260 can keep the temperature of pure water in the cooling tank 210 relatively stable and higher than the melting point of yellow phosphorus, thereby ensuring that the yellow phosphorus is cooled into liquid in the cooling tank 210.

[0068] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A restoration system, characterized in that, include: The reaction mechanism is used to react phosphorus trichloride and hydrogen gas to produce yellow phosphorus and hydrochloric acid; A cooling mechanism includes a cooling tank and an air inlet pipe. The cooling tank has a first inlet, a second inlet, an overflow outlet, and a discharge outlet. The first inlet and the second inlet are located at the top of the cooling tank. The overflow outlet is located on the side of the cooling tank, and the discharge outlet is located at the bottom of the cooling tank. The output end of the reaction mechanism is connected to the first inlet. The air inlet pipe is disposed inside the cooling tank, with one end connected to the first inlet and the other end at a horizontal height lower than the overflow outlet. The liquid supply mechanism is connected to the second inlet and is used to supply pure water.

2. The restoration system according to claim 1, characterized in that, The cooling mechanism includes multiple cooling tanks and multiple air inlet pipes, with each air inlet pipe corresponding to one of the multiple cooling tanks; the cooling mechanism also includes connecting pipes. The top of the cooling tank is also provided with an exhaust port. The connecting pipe is located between two adjacent cooling tanks, with one end connected to the exhaust port of one of the cooling tanks and the other end connected to the first inlet of the other cooling tank.

3. The restoration system according to claim 2, characterized in that, The cooling tank is equipped with a baffle plate connected to the side wall of the cooling tank to form an overflow cavity with the side wall facing downward. The overflow cavity is connected to the overflow port, and the horizontal height of the opening of the overflow cavity is lower than the horizontal height of the overflow port.

4. The restoration system according to claim 1, characterized in that, The cooling mechanism also includes an exhaust pipe and an insulation sleeve. One end of the exhaust pipe is connected to the reaction mechanism, and the other end is connected to the first input port. The insulation sleeve covers the exhaust pipe and the outside of the cooling tank.

5. The restoration system according to claim 1, characterized in that, The reaction mechanism includes a reaction tube and a heating sleeve. The reaction tube is used to supply phosphorus trichloride and hydrogen for reaction. The output end of the reaction tube is connected to the first input port. The heating sleeve covers the outside of the reaction tube.

6. The restoration system according to claim 5, characterized in that, The reaction mechanism also includes a heat insulation layer, which covers the outside of the heating jacket.

7. The restoration system according to claim 5, characterized in that, The reaction tube is provided with two porous baffles spaced apart along its length, and a packing material is provided between the two porous baffles.

8. The restoration system according to claim 5, characterized in that, The reaction tube has an air inlet and a feed inlet at the end away from the cooling mechanism; the reduction system also includes a gas supply mechanism and a feed mechanism, the gas supply mechanism is connected to the air inlet and can alternately supply nitrogen and hydrogen, and the feed mechanism is connected to the feed inlet and can supply phosphorus trichloride.

9. The restoration system according to claim 8, characterized in that, The gas supply mechanism includes a first gas inlet assembly, a second gas inlet assembly, and a switching valve. Both the first gas inlet assembly and the second gas inlet assembly are connected to the gas inlet through the switching valve. The first gas inlet assembly is used to input nitrogen gas, and the second gas inlet assembly is used to input hydrogen gas. The switching valve is used to allow the first gas inlet assembly and the second gas inlet assembly to alternately connect to the gas inlet.

10. The restoration system according to claim 9, characterized in that, The gas supply mechanism also includes a flame arrester and a pressure detector, both of which are located between the switching valve and the reaction tube.

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