Reaction equipment and system for producing phosphorus pentasulfide

Abstract

The invention provides reaction equipment and a system for producing phosphorus pentasulfide. The reaction equipment comprises a kettle body and a stirring mechanism arranged in the kettle body, a reaction chamber is arranged in the kettle body, an exhaust port communicated with the reaction chamber is formed in the top of the kettle body, and a feeding port and a discharging port which are communicated with the reaction chamber are formed in the bottom of the kettle body; the stirring mechanism comprises a stirring shaft transversely arranged in the kettle body, a driving part arranged outside the kettle body and connected with the stirring shaft, and a plurality of stirring blade assemblies arranged on the stirring shaft in a sleeving manner; the stirring blade assembly comprises a plurality of stirring blades circumferentially arranged around the stirring shaft, cavities are formed in the stirring blades, liquid inlet holes communicated with the cavities are formed in the ends, close to the stirring shaft, of the stirring blades, and liquid outlet holes communicated with the cavities are formed in the other ends of the stirring blades. The reaction system for producing phosphorus pentasulfide comprises the reaction equipment. According to the reaction equipment for producing the phosphorus pentasulfide, the problem that the quality of the phosphorus pentasulfide produced and prepared by the reaction equipment for producing the phosphorus pentasulfide in the prior art is relatively low is solved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical production equipment, and in particular to a reaction device and a system for producing phosphorus pentasulfide. Background Art

[0002] Phosphorus pentasulfide is an inorganic compound, a yellow solid, stable when dry, but hydrolyzed into phosphoric acid and hydrogen sulfide in water, so there is a smell of rotten eggs in the air. Phosphorus pentasulfide is an important raw material for pesticide synthesis. It reacts with alcohol to obtain important phosphorus-containing intermediate sulfide, which can be further synthesized into a variety of pesticides, such as dimethoate. Sulfide chlorination can obtain another important phosphorus-containing intermediate chloride, which can also be synthesized into a variety of pesticides, such as fenitrothion, phoxim, diazinon, etc. In addition, it is also used as a non-ferrous metal beneficiation agent, high-grade lubricant additive, etc., as well as in match manufacturing, pharmaceutical products and rubber vulcanization auxiliary agents.

[0003] There are two methods for preparing phosphorus pentasulfide: gas phase method and liquid phase method. However, the gas phase method has high temperature, the exhaust pipe of the reactor is easily blocked, and the operation is difficult. Therefore, the liquid phase method is basically used to prepare phosphorus pentasulfide in China. When preparing phosphorus pentasulfide by the liquid phase method, yellow phosphorus and sulfur need to be heated to a molten state respectively, and then added to the reactor with phosphorus pentasulfide mother liquor at a fixed ratio for stirring reaction.

[0004] However, the reaction between sulfur and yellow phosphorus has the following characteristics: sulfur and yellow phosphorus are mutually soluble but do not react at temperatures below 240°C, but react violently at temperatures above 240°C, releasing a large amount of heat. Therefore, the reaction temperature in the reactor is usually 350°C-400°C. The boiling point of yellow phosphorus is 280°C, so there will be a problem of yellow phosphorus gasification, causing the gasified yellow phosphorus to be discharged from the reaction equipment along with the waste gas, which in turn affects the quality of the finished phosphorus pentasulfide product. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a reaction device and system for producing phosphorus pentasulfide, aiming to solve the problem of low quality of phosphorus pentasulfide produced by the reaction device for producing phosphorus pentasulfide in the prior art.

[0006] The reaction equipment for producing phosphorus pentasulfide proposed in the present invention comprises a kettle body and a stirring mechanism arranged in the kettle body; a reaction chamber for materials to react is arranged inside the kettle body, an exhaust port connected to the reaction chamber is arranged at the top of the kettle body, and a feed port and a discharge port connected to the reaction chamber are arranged at the bottom of the kettle body; the stirring mechanism comprises a stirring shaft horizontally arranged in the kettle body, a driving component arranged outside the kettle body and connected to the stirring shaft, and a stirring blade assembly sleeved on the stirring shaft and rotating with the stirring shaft, and a plurality of the stirring blade assemblies are evenly distributed along the length direction of the stirring shaft; the stirring blade assembly comprises a plurality of stirring blades arranged circumferentially around the stirring shaft, a cavity is arranged inside the stirring blade, a liquid inlet hole connected to the cavity is arranged at one end of the stirring blade close to the stirring shaft, and a liquid outlet hole connected to the cavity is arranged at one end of the stirring blade away from the stirring shaft.

[0007] The above-mentioned reaction equipment for producing phosphorus pentasulfide is provided with a kettle body and a feed port at the bottom of the kettle body, so that yellow phosphorus and sulfur enter the reaction chamber of the kettle body with phosphorus pentasulfide mother liquor in a specific proportion in a molten state to react, and a stirring mechanism is provided to stir the internal solution, so that the reaction is carried out quickly and continuously. Since a large amount of heat is released by the reaction, the temperature in the kettle body rises sharply, thereby making the yellow phosphorus easy to gasify and the pressure in the kettle body rises. In order to ensure that the pressure and temperature in the kettle body are within a preset range and thus ensure the safety of the reaction, the exhaust port on the top of the kettle body is used to exhaust gas to the outside, the pressure in the kettle body is released, and the high-temperature gas is transferred to cool the kettle body. Since the stirring mechanism includes a horizontally placed stirring shaft and a stirring blade assembly arranged on the stirring shaft, when the stirring mechanism is stirring, part of the stirring blades are placed in the solution. In the stirring mechanism, another part of the stirring blade is placed above the solution. Since the stirring liquid is a hollow structure, and the root of the stirring blade is provided with a liquid inlet hole, and the top of the stirring blade is provided with a liquid outlet hole, when the stirring mechanism is stirring, the stirring blade is first placed in the solution so that the solution is poured into the stirring blade. When the stirring blade rotates and moves above the liquid surface, the solution in the stirring blade will flow toward the liquid outlet hole under the action of centrifugal force, and then sprayed above the liquid surface. Therefore, when the yellow phosphorus is subjected to high-temperature gasification during the reaction and moves toward the exhaust port, it will contact with the solution sprayed by the stirring liquid. Since the yellow phosphorus and sulfur are added in proportion, and the yellow phosphorus is partially gasified, there is unreacted sulfur solution in the solution sprayed by the stirring blade, and then the sulfur solution is contacted with the yellow phosphorus to react, thereby avoiding the yellow phosphorus gasification and being discharged with the waste gas, thereby ensuring the reaction ratio of phosphorus and sulfur, and thus improving the quality of the finished product of phosphorus pentasulfide. Therefore, the present invention solves the problem of low quality of phosphorus pentasulfide produced by the reaction equipment for producing phosphorus pentasulfide in the prior art.

[0008] In addition, the reaction equipment for producing phosphorus pentasulfide proposed in the present invention may also have the following additional technical features:

[0009] Preferably, the stirring shaft includes a main inner shaft portion and an outer shaft portion sleeved at both ends of the main inner shaft portion, outer gear teeth are provided on the outer sides of both ends of the main inner shaft portion, and inner gear teeth are provided on the inner side of the outer shaft portion; the stirring blade assembly also includes a transmission rod and a connecting block sleeved on the transmission rod and connected to the stirring blade, gears matching the outer gear teeth and the inner gear teeth are provided at both ends of the transmission rod, so that when the main inner shaft portion rotates, the transmission rod rotates around the main inner shaft portion and rotates at the same time; the transmission rod is composed of a reciprocating wire rod portion and a smooth rod portion arranged at intervals, the connecting block is sleeved on the reciprocating wire rod portion, and is provided with a threaded hole matching the reciprocating wire rod portion.

[0010] Preferably, the stirring blade assembly includes a transmission block connected to the stirring shaft, a stirring rod arranged on the transmission block, and connecting plates arranged at both ends of the stirring rod, and the stirring blade connected to the connecting plate, the connecting plate extending outward with a plurality of connecting parts, the stirring blade is spirally arranged along the length direction of the stirring rod and the two ends are respectively connected to the connecting parts of the two connecting plates, and the cross-section of the stirring blade is wing-shaped.

[0011] Preferably, two feed ports are provided at the bottom of the kettle body, which are used for feeding yellow phosphorus and sulfur respectively and are respectively arranged on both sides of the bottom of the kettle body, and the exhaust port is arranged at the top of the kettle body away from the feed port for feeding the yellow phosphorus.

[0012] Preferably, the plurality of stirring mechanisms are arranged in parallel and tilted so that a certain angle is formed between the stirring blades and the stirring shaft, and the two sides of the stirring shaft are divided into a first radial side and a second radial side. The stirring blades are arranged tilted from the first radial side toward the second radial side and extend from a first direction to a second direction. The first direction is the side of the stirring shaft close to the feed port for feeding the yellow phosphorus, and the second direction is opposite to the first direction.

[0013] Preferably, the main inner shaft portion has guide sheet portions extending outwardly, and the guide sheet portions are arranged on both sides of the connecting block.

[0014] Preferably, the lengths of the stirring blades of different stirring blade assemblies are different, and the length of the stirring blade is inversely proportional to the distance from the midpoint of the stirring shaft.

[0015] Preferably, the diameter of the kettle body is two-thirds to three-quarters of the height of the kettle body.

[0016] Preferably, the direction of the liquid inlet hole is consistent with the rotation direction of the stirring blade.

[0017] In addition, the present invention also provides a system for producing phosphorus pentasulfide, comprising the above-mentioned reaction equipment for producing phosphorus pentasulfide, a feeding device connected to the feed port of the reaction equipment, a finished product preparation device connected to the discharge port of the reaction equipment, and a waste gas treatment device connected to the exhaust port of the reaction equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a reaction device for producing phosphorus pentasulfide proposed in the first embodiment of the present invention;

[0019] Figure 2 It is a cross-sectional schematic diagram of a reaction device for producing phosphorus pentasulfide proposed in the first embodiment of the present invention;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure after the kettle is hidden;

[0021] Figure 4 for Figure 3 A local enlarged view at point A;

[0022] Figure 5 for Figure 3 A schematic diagram of the structure from another perspective;

[0023] Figure 6 for Figure 5 A local enlarged view at point B;

[0024] Figure 7 This is a schematic structural diagram of a reaction device for producing phosphorus pentasulfide according to a second embodiment of the present invention, with the kettle body hidden.

[0025] Description of main component symbols:

[0026] Kettle 10 Mixing mechanism 20 Reaction chamber 11 Exhaust port 12 Feed port 13 Discharge port 14 Stirring shaft 21 Drive components 22 Stirring blade assembly 23 Stirring blade 231 Liquid inlet hole 2311 Liquid outlet 2312 Main inner shaft 211 Outer shaft 212 External gear 2111 Internal gear 2121 Transmission rod 232 Connection Block 233 gear 234 Reciprocating screw rod 2321 Bare Rod 2322 Threaded Hole 2331 Transmission block 235 Stirring rod 236 Connecting plate 237 Connection 2371 Guide piece 213

[0027] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] See also Figures 1 to 6 , shown is a reaction device for producing phosphorus pentasulfide in a first embodiment of the present invention, comprising a kettle body 10 and a stirring mechanism 20 disposed in the kettle body 10;

[0032] A reaction chamber 11 for materials to react is provided inside the kettle body 10, an exhaust port 12 connected to the reaction chamber 11 is provided at the top of the kettle body 10, and a feed port 13 and a discharge port 14 connected to the reaction chamber 11 are provided at the bottom of the kettle body 10; the stirring mechanism 20 includes a stirring shaft 21 horizontally placed in the kettle body 10, a driving component 22 arranged outside the kettle body 10 and connected to the stirring shaft 21, and a stirring blade assembly 23 sleeved on the stirring shaft 21 and rotating with the stirring shaft 21, and multiple stirring blade assemblies 23 are evenly distributed along the length direction of the stirring shaft 21; the stirring blade assembly 23 includes multiple stirring blades 231 arranged circumferentially around the stirring shaft 21, a cavity is provided in the stirring blade 231, a liquid inlet hole 2311 connected to the cavity is provided at one end of the stirring blade 231 close to the stirring shaft 21, and a liquid outlet hole 2312 connected to the cavity is provided at one end of the stirring blade 231 away from the stirring shaft 21.

[0033] It can be understood that by providing the kettle body 10 and providing the feed port 13 at the bottom of the kettle body 10, yellow phosphorus and sulfur enter the reaction chamber 11 of the kettle body 10 in a specific proportion in a molten state to react, and the internal solution is stirred by providing a stirring mechanism 20, so that the reaction proceeds rapidly and continuously. Since a large amount of heat is released by the reaction, the temperature in the kettle body 10 rises sharply, thereby making the yellow phosphorus easily gasified and the pressure in the kettle body 10 rises. In order to ensure that the pressure and temperature in the kettle body 10 are within a preset range and thus ensure the safety of the reaction, the exhaust port 12 at the top of the kettle body 10 is used to exhaust gas to the outside, the pressure in the kettle body 10 is released, and the high-temperature gas is transferred to cool the kettle body 10. Since the stirring mechanism 20 includes a horizontally placed stirring shaft 21 and a stirring blade assembly 23 arranged on the stirring shaft 21, when the stirring mechanism 20 is stirring, part of the stirring blades 231 are placed in the solution, and the other part is placed in the stirring blade assembly 231. The stirring blade 231 is placed above the solution. Since the stirring liquid is a hollow structure, and a liquid inlet hole 2311 is provided at the root of the stirring blade 231, and a liquid outlet hole 2312 is provided at the top of the stirring blade 231, when the stirring mechanism 20 is stirring, the stirring blade 231 is first placed in the solution so that the solution is poured into the stirring blade 231. When the stirring blade 231 rotates and moves above the liquid surface, the solution in the stirring blade 231 will flow toward the liquid outlet hole 2312 under the action of centrifugal force, and then sprayed above the liquid surface. Therefore, when the yellow phosphorus is vaporized by high temperature during the reaction and moves toward the exhaust port 12, it will contact with the solution sprayed by the stirring liquid. Since the yellow phosphorus and sulfur are added in proportion and the yellow phosphorus is partially vaporized, there is unreacted sulfur solution in the solution sprayed by the stirring blade 231, and then the sulfur solution is contacted and reacted with the yellow phosphorus, thereby avoiding the yellow phosphorus vaporization and being discharged with the waste gas, thereby ensuring the reaction ratio of phosphorus and sulfur, thereby improving the quality of the finished product of phosphorus pentasulfide. Therefore, the present invention solves the problem of low quality of phosphorus pentasulfide produced by the reaction equipment used for producing phosphorus pentasulfide in the prior art.

[0034] Specifically, the stirring shaft 21 includes a main inner shaft portion 211 and an outer shaft portion 212 sleeved on both ends of the main inner shaft portion 211, outer gear teeth 2111 are provided on the outer sides of both ends of the main inner shaft portion 211, and inner gear teeth 2121 are provided on the inner side of the outer shaft portion 212; the stirring blade assembly 23 also includes a transmission rod 232 and a connecting block 233 sleeved on the transmission rod 232 and connected to the stirring blade 231, and gears 234 adapted to the outer gear teeth 2111 and the inner gear teeth 2121 are provided at both ends of the transmission rod 232, so that when the main inner shaft portion 211 rotates, the transmission rod 232 rotates around the main inner shaft portion 211 and rotates at the same time; the transmission rod 232 is composed of a reciprocating wire rod portion 2321 and a smooth rod portion 2322 arranged at intervals, the connecting block 233 is sleeved on the reciprocating wire rod portion 2321, and is provided with a threaded hole 2331 adapted to the reciprocating wire rod portion 2321. In a specific implementation, the stirring shaft 21 is provided with a main inner shaft portion 211 and an outer shaft portion 212, so that the stirring mechanism 20 is connected to the main inner shaft portion 211 and rotates with the main inner shaft portion 211. In addition, outer gear teeth 2111 are provided on the outer sides of both ends of the main inner shaft portion 211, and inner gear teeth 2121 are provided on the inner side of the outer shaft portion 212, and they cooperate with the gears 234 at both ends of the transmission rod 232, so that the three constitute a planetary gear structure, so that when the main inner shaft portion 211 rotates under the action of the driving component 22, the transmission rod 232 will rotate around the main inner shaft portion 211 while rotating. In addition, since the stirring blade 231 is connected to the main inner shaft portion 211 through the connecting block 233, the stirring blade 231 is connected to the main inner shaft portion 211 through the connecting block 233. The transmission rod 232 is connected, and a threaded hole 2331 is provided on the connecting rod to adapt to the reciprocating wire rod portion 2321 on the transmission rod 232, so that the transmission rod 232 rotates around the main inner shaft portion 211 and rotates on its own, and the stirring blade 231 is driven to rotate around the main inner shaft portion 211, and due to the cooperation between the reciprocating wire rod portion 2321 and the threaded hole 2331, the stirring blade 231 reciprocates back and forth along the length direction of the main inner shaft portion 211, so that the solution sprayed at the liquid outlet 2312 of the stirring blade 231 covers a larger range, and the contact probability and efficiency of the unreacted sulfur liquid in the solution and the gasified yellow phosphorus are increased. The quality of the finished phosphorus pentasulfide is further improved.

[0035] In addition, the main inner shaft portion 211 extends outwardly with a guide piece portion 213, and the guide piece portion 213 is arranged on both sides of the connection block 233. In a specific implementation, in order to prevent the stirring blade 231 from shaking and deflecting when moving on the transmission rod 232, so as to interfere with the adjacent stirring blade 231, thereby affecting the stirring effect and the effect of the liquid outlet 2312 spraying the solution, the guide pieces are arranged on both sides of the connection block 233 to limit the connection block 233 to move forward and backward relative to the transmission rod 232, and not to rotate and shake.

[0036] Specifically, the lengths of the stirring blades 231 of different stirring blade assemblies 23 are different, and the length of the stirring blades 231 is inversely proportional to the distance from the midpoint of the stirring shaft 21. By way of example and not limitation, in some optional embodiments, since the stirring shaft 21 is horizontally placed and the reactor is generally cylindrical, the distance between the stirring shaft 21 and the side wall of the reactor gradually decreases from the middle of the stirring shaft 21 to both sides. Therefore, in order to ensure the stirring efficiency, the length of the stirring blades 231 in each stirring blade assembly 23 is set according to the position of the stirring blade assembly 23 itself, so that the volume of the stirring blades 231 at each location is large enough, thereby ensuring the stirring effect of the stirring mechanism 20.

[0037] In addition, the diameter of the kettle 10 is two-thirds to three-quarters of the height of the kettle 10. In specific implementation, since the center line of the stirring shaft 21 is usually set at the liquid level, and the liquid level is usually slightly in the middle of the high-pressure reactor, if the reactor height is much higher than the diameter, the stirring blade 231 of the stirring mechanism 20 is difficult to extend into the bottom of the solution for stirring due to the limitation of the diameter length, and the length of the stirring blade 231 near the two ends of the stirring shaft 21 will be smaller, which will greatly affect the stirring effect of the stirring mechanism 20, and because the length of the stirring blade 231 is small, and the height of the reactor is too high, the solution spilled by the stirring blade 231 cannot be located at a higher point of the reactor, so it will fall faster, reducing the contact time between the solution and the gasified yellow phosphorus, affecting the reaction effect of both. Therefore, it is necessary to limit the diameter and height of the kettle 10 so that the kettle 10 as a whole is in the form of a nearly cube. By way of example and not limitation, in some optional embodiments, the reactor can be placed horizontally like the stirring shaft 21 to avoid this situation. However, the horizontal design of the reactor is too different from the existing production line equipment, resulting in the need for corresponding adjustments to other equipment. At present, there are no manufacturers of other equipment for this situation, so the cost of updating the entire production system is too high and not economically efficient.

[0038] Specifically, the direction of the liquid inlet 2311 is consistent with the rotation direction of the stirring blade 231. By adjusting the direction of the liquid inlet 2311, when the stirring blade 231 rotates, the rotational force will also assist the liquid, thereby improving the liquid inlet efficiency of the cavity in the stirring blade 231. In addition, the liquid inlet 2311 is arranged on the side of the stirring blade 231. When the stirring blade 231 rotates from the liquid surface to above the liquid surface, the direction of the liquid inlet 2311 will not be directly toward the gravity direction below, thereby hindering the solution from flowing out of the liquid inlet 2311 to a certain extent, so that under the same centrifugal force, the liquid outlet 2312 of the stirring blade 231 will sprinkle more solution at a higher height.

[0039] See also Figure 7, shown is a reaction device for producing phosphorus pentasulfide in a second embodiment of the present invention. The second embodiment is substantially consistent with the first embodiment in structure, except that the stirring blade assembly 23 includes a transmission block 235 connected to the stirring shaft 21, a stirring rod 236 arranged on the transmission block 235, and connecting plates 237 arranged at both ends of the stirring rod 236, and a stirring blade 231 connected to the connecting plate 237, the connecting plate 237 extends outward with a plurality of connecting portions 2371, the stirring blade 231 is spirally arranged along the length direction of the stirring rod 236 and the two ends are respectively connected to the connecting portions 2371 of the two connecting plates 237, and the cross-section of the stirring blade 231 is wing-shaped. Specifically, by spirally arranging the stirring blade 231 along the length direction of the stirring rod 236 and connecting the two ends thereof with the connecting parts 2371 of the two connecting plates 237 respectively, and designing the cross-section of the stirring blade 231 to be wing-shaped, the stirring rod 236 rotates around the stirring shaft 21 while the stirring blade 231 rotates around the stirring rod 236, so that the stirring effect of the stirring mechanism 20 on the solution is not only rotational stirring along the circumferential direction of the stirring shaft 21, but also has the effect of circumferential rotational stirring around the stirring rod 236, so that the stirring effect of the stirring mechanism 20 is better, and the yellow phosphorus and sulfur in the molten state are more likely to contact and mix with each other for reaction. In addition, since the stirring blade 231 will rotate around the stirring rod 236, and the stirring blade 231 is provided with a plurality of evenly distributed liquid outlet holes 2312 on the side away from the stirring shaft 21, when the stirring blade 231 is located above the liquid surface, under the action of the rotation of the stirring blade 231, the liquid outlet holes 2312 of the stirring blade 231 will throw out the solution, and the solution will be distributed above the liquid surface in a circular surface, especially when the stirring blade 231 is located directly above the liquid surface, the circular surface formed by the solution will completely cover the space above the liquid surface, and then the solution has a wider coverage and better effect than the solution everywhere of the stirring blade 231 rotating around the stirring shaft 21 in the first embodiment. In addition, since the lengths of the stirring blades 231 of each stirring blade assembly 23 are inconsistent, when the centrifugal force is large enough, the solution discharged by the stirring blade 231 can form a multi-layer solution surface on the liquid surface, and then the space above the liquid surface is fully covered, so that the gasified yellow phosphorus reacts with the sulfur in the solution as much as possible, and the possibility of the gasified yellow phosphorus being discharged with the waste gas is greatly reduced.

[0040] It should be noted that, by way of example and not limitation, in some optional embodiments, the structures in Embodiment 1 and Embodiment 2 may be adjusted to a certain extent and combined with each other so that the stirring blade 231 rotates around the stirring rod 236 while moving back and forth along the stirring shaft 21, thereby further increasing the coverage area of ​​the solution surface without the need for a large centrifugal force.

[0041] Furthermore, two feed ports 13 are provided at the bottom of the kettle body 10, which are used for feeding yellow phosphorus and sulfur respectively and are respectively placed on both sides of the bottom of the kettle body 10, and the exhaust port 12 is provided at the top of the kettle body 10 on the side away from the feed port 13 for feeding yellow phosphorus. By adjusting the relative positions of the yellow phosphorus feed port 13 and the exhaust port 12, the exhaust path of the yellow phosphorus gasification is extended as much as possible, thereby increasing the contact time between the solution thrown out of the liquid outlet 2312 of the stirring blade 231 and the gasified yellow phosphorus.

[0042] In addition, a plurality of stirring mechanisms 20 are arranged in parallel and tilted, so that a certain angle is formed between the stirring blades 231 and the stirring shaft 21, the two sides of the stirring shaft 21 are divided into a first radial side and a second radial side, the stirring blades 231 are tilted from the first radial side toward the second radial side and extend from the first direction to the second direction, the first direction is the side of the stirring shaft 21 close to the feed port 13 for feeding yellow phosphorus, and the second direction is opposite to the first direction. By tilting the stirring blades 231, the solution surface formed by the solution thrown out by the stirring blades 231 is opposite to the flow direction of the vaporized yellow phosphorus, so that the concentration of the vaporized yellow phosphorus contacted by the solution surface is higher, and the reaction efficiency of the liquefied sulfur and the vaporized yellow phosphorus in the solution is further improved, thereby reducing the escape rate of the yellow phosphorus gas and improving the quality of the finished phosphorus pentasulfide.

[0043] In summary, the reaction equipment for producing phosphorus pentasulfide in the above embodiment of the present invention is provided with a kettle body 10 and a feed port 13 at the bottom of the kettle body 10, so that yellow phosphorus and sulfur enter the reaction chamber 11 of the kettle body 10 with phosphorus pentasulfide mother solution in a specific proportion in a molten state to react, and the internal solution is stirred by a stirring mechanism 20, so that the reaction is carried out quickly and continuously. Since a large amount of heat is released by the reaction, the temperature in the kettle body 10 rises sharply, thereby making the yellow phosphorus easy to gasify and the pressure in the kettle body 10 rises. In order to ensure that the pressure and temperature in the kettle body 10 are within a preset range and thus ensure the safety of the reaction, the exhaust port 12 at the top of the kettle body 10 is used to exhaust gas to the outside, the pressure in the kettle body 10 is released, and the high-temperature gas is transferred to cool the kettle body 10. Since the stirring mechanism 20 includes a horizontal stirring shaft 21 and a stirring blade assembly 23 arranged on the stirring shaft 21, when the stirring mechanism 20 is stirring, part of the stirring blade 23 is moved. The stirring blade 231 is placed in the solution, and the other part of the stirring blade 231 is placed above the solution. Since the stirring liquid is a hollow structure, and the root of the stirring blade 231 is provided with a liquid inlet hole 2311, and the top of the stirring blade 231 is provided with a liquid outlet hole 2312, when the stirring mechanism 20 is stirring, the stirring blade 231 is first placed in the solution, so that the solution is poured into the stirring blade 231. When the stirring blade 231 rotates and moves above the liquid surface of the solution, the solution in the stirring blade 231 will flow to the liquid outlet hole 2312 under the action of centrifugal force. 12 direction, and then sprayed above the liquid surface, so when the yellow phosphorus is vaporized by the high temperature during the reaction and moves toward the exhaust port 12, it will contact with the solution sprayed by the stirring liquid. Since the yellow phosphorus and sulfur are added in proportion, and the yellow phosphorus is partially vaporized, there is unreacted sulfur solution in the solution sprayed by the stirring blade 231, and then the sulfur solution and the yellow phosphorus are contacted and reacted, thereby avoiding the yellow phosphorus vaporization and being discharged with the waste gas, thereby ensuring the reaction ratio of phosphorus and sulfur, and thus improving the quality of the finished product of phosphorus pentasulfide. Therefore, the present invention solves the problem of low quality of phosphorus pentasulfide produced by the reaction equipment for producing phosphorus pentasulfide in the prior art.

[0044] In addition, the present invention also proposes a system for producing phosphorus pentasulfide, which includes the above-mentioned reaction equipment for producing phosphorus pentasulfide, and, in some optional embodiments, also includes a feeding device connected to the feed port 13 of the reaction equipment, a finished product preparation device connected to the discharge port 14 of the reaction equipment, and a waste gas treatment device connected to the exhaust port 12 of the reaction equipment.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A reaction device for producing phosphorus pentasulfide, characterized in that: It comprises a kettle body and a stirring mechanism arranged in the kettle body; A reaction chamber for reacting materials is provided inside the kettle body, an exhaust port communicating with the reaction chamber is provided at the top of the kettle body, and a feed port and a discharge port communicating with the reaction chamber are provided at the bottom of the kettle body; The stirring mechanism comprises a stirring shaft horizontally arranged in the kettle body, a driving component arranged outside the kettle body and connected to the stirring shaft, and a stirring blade assembly sleeved on the stirring shaft and rotating with the stirring shaft, wherein a plurality of the stirring blade assemblies are evenly distributed along the length direction of the stirring shaft; The stirring blade assembly includes a plurality of stirring blades circumferentially arranged around the stirring shaft, a cavity is provided in the stirring blade, one end of the stirring blade close to the stirring shaft is provided with a liquid inlet hole connected to the cavity, and the end of the stirring blade away from the stirring shaft is provided with a liquid outlet hole connected to the cavity.

2. The reaction equipment for producing phosphorus pentasulfide according to claim 1, characterized in that: The stirring shaft comprises a main inner shaft portion and an outer shaft portion sleeved on both ends of the main inner shaft portion, outer gear teeth are arranged on the outer sides of both ends of the main inner shaft portion, and inner gear teeth are arranged on the inner side of the outer shaft portion; The stirring blade assembly also includes a transmission rod, a connecting block sleeved on the transmission rod and connected to the stirring blade, and gears adapted to the outer gear teeth and the inner gear teeth are provided at both ends of the transmission rod, so that when the main inner shaft portion rotates, the transmission rod rotates around the main inner shaft portion and rotates at the same time; The transmission rod is composed of a reciprocating wire rod part and a smooth rod part which are arranged at intervals. The connecting block is sleeved on the reciprocating wire rod part and is provided with a threaded hole which is adapted to the reciprocating wire rod part.

3. The reaction equipment for producing phosphorus pentasulfide according to claim 1, characterized in that: The stirring blade assembly includes a transmission block connected to the stirring shaft, a stirring rod arranged on the transmission block, and connecting plates arranged at both ends of the stirring rod, and the stirring blade connected to the connecting plate, the connecting plate extending outward with a plurality of connecting parts, the stirring blade is spirally arranged along the length direction of the stirring rod and the two ends are respectively connected to the connecting parts of the two connecting plates, and the cross-section of the stirring blade is wing-shaped.

4. The reaction equipment for producing phosphorus pentasulfide according to claim 2 or 3, characterized in that: The bottom of the kettle body is provided with two feed ports, which are used for feeding yellow phosphorus and sulfur respectively and are respectively arranged on both sides of the bottom of the kettle body. The exhaust port is arranged on the top of the kettle body away from the feed port for feeding the yellow phosphorus.

5. The reaction equipment for producing phosphorus pentasulfide according to claim 4, characterized in that: The plurality of stirring mechanisms are arranged in parallel and tilted so that a certain angle is formed between the stirring blades and the stirring shaft. The two sides of the stirring shaft are divided into a first radial side and a second radial side. The stirring blades are arranged tilted from the first radial side toward the second radial side and extend from a first direction to a second direction. The first direction is the side of the stirring shaft close to the feed port for feeding the yellow phosphorus, and the second direction is opposite to the first direction.

6. The reaction equipment for producing phosphorus pentasulfide according to claim 2, characterized in that: The main inner shaft portion is provided with guide pieces extending outwardly, and the guide pieces are arranged on both sides of the connecting block.

7. A reaction device for producing phosphorus pentasulfide according to any one of claims 1 to 3, characterized in that The lengths of the stirring blades of different stirring blade assemblies are different, and the length of the stirring blade is inversely proportional to the distance from the midpoint of the stirring shaft.

8. A reaction device for producing phosphorus pentasulfide according to any one of claims 1 to 3, characterized in that The diameter of the kettle body is two-thirds to three-quarters of the height of the kettle body.

9. The reaction equipment for producing phosphorus pentasulfide according to any one of claims 1 to 3, characterized in that: The direction of the liquid inlet hole is consistent with the rotation direction of the stirring blade.

10. A system for producing phosphorus pentasulfide, characterized in that: It comprises the reaction equipment for producing phosphorus pentasulfide according to any one of claims 1 to 9, a feeding equipment connected to the feed port of the reaction equipment, a finished product preparation equipment connected to the discharge port of the reaction equipment, and a waste gas treatment equipment connected to the exhaust port of the reaction equipment.

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