Atomizing nozzle, phosphorus pentachloride synthesis reactor and phosphorus pentachloride synthesis system

Abstract

The utility model discloses an atomizing nozzle, a phosphorus pentachloride synthesis reactor and a phosphorus pentachloride synthesis system, which comprise a nozzle body, a first inlet, a second inlet, a third inlet, a fourth inlet, a fifth inlet and an outlet, the second inlet and the fourth inlet are both used for introducing first gas, and the fifth inlet is used for introducing second gas; the atomizing nozzle disclosed by the utility model can strengthen gas-liquid mixing and control the size and the shape of atomized particles, and in addition, the atomizing nozzle disclosed by the utility model is arranged on the reactor body, so that the distribution uniformity of materials in the space of the reactor body is improved, and a high-temperature area in the reactor body is reduced or eliminated.

Description

Technical Field

[0001] The utility model relates to an atomizing nozzle, a phosphorus pentachloride synthesis reactor and a synthesis system. Background Art

[0002] Phosphorus pentachloride is one of the important phosphorus chlorides. As an efficient chlorinating agent and catalyst, it is widely used in energy, medicine, pesticides, dyes, chemical fibers and other fields. It is the raw material for the production of lithium hexafluorophosphate, phosphazene chloride, phosphorus oxychloride, azathioprine, flucytosine and other products.

[0003] The traditional phosphorus pentachloride production process is as follows: liquid phosphorus trichloride is added to a sealed reactor, and chlorine gas is introduced from the bottom of the reactor to cause a chlorination reaction in the phosphorus trichloride, transforming the material in the reactor from a liquid phase to a solid phase. Carbon dioxide gas is then introduced to purge the phosphorus trichloride remaining in the phosphorus pentachloride, causing the phosphorus trichloride to be replaced by carbon dioxide, and the phosphorus pentachloride in the reactor is completely transformed into a solid phase.

[0004] While simple, these methods are intermittent operations, preventing continuous production. They also suffer from poor product quality and stability, a harsh operating environment, and severe pollution, making them difficult to meet the requirements of continuous, large-scale clean production. In practice, there is an urgent need to develop continuous feeding methods to ensure long-term, stable, and efficient system operation.

[0005] In recent years, several continuous phosphorus pentachloride production processes have been developed, such as patent document CN116920764A. These processes utilize atomized phosphorus trichloride into droplets, which then react with gaseous chlorine to produce phosphorus pentachloride particles. To control the reaction temperature, large amounts of CO₂ or N₂ are required as diluents and circulating gas for cooling, resulting in a large reactor volume and difficult temperature control. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the problems of difficult system temperature control and low product purity in the existing phosphorus pentachloride production. A nozzle, a phosphorus pentachloride synthesis reactor and a synthesis system are provided. The utility model can enhance gas-liquid mixing, control the size and shape of atomized particles, achieve uniform temperature control of the liquid in the reactor, eliminate high-temperature areas in the reactor, and obtain phosphorus pentachloride particles with large diameter and high purity.

[0007] The utility model solves the above technical problems through the following technical solutions:

[0008] The utility model first provides an atomizing nozzle, which includes a nozzle body and a first inlet, a second inlet, a third inlet, a fourth inlet, a fifth inlet and an outlet arranged on the nozzle body and connected to each other, wherein the first inlet and the third inlet are both used for introducing liquid, the second inlet and the fourth inlet are both used for introducing a first gas, and the fifth inlet is used for introducing a second gas;

[0009] The first inlet is coaxially arranged at the top end of the nozzle body, and the outlet is coaxially arranged at the bottom end of the nozzle body. The second inlet, the third inlet, the fourth inlet and the fifth inlet are all arranged on the side of the nozzle body. The second inlet is close to the first inlet, and the liquid passed into the first inlet is preliminarily atomized by the first gas passed into the second inlet. The third inlet is arranged on a branch of the fourth inlet, and the liquid passed into the third inlet is preliminarily atomized by the first gas passed into the fourth inlet; the fifth inlet is close to the outlet, and the preliminarily atomized liquid is secondary atomized by the second gas passed into the fifth inlet.

[0010] In the present invention, the outlet is preferably an inwardly contracted structure, and the contraction angle is preferably 15 to 75°, more preferably 60°. The contraction angle refers to the angle between the side surface of the outlet and the cross section of the outlet.

[0011] In the present invention, preferably, the second inlet, the fourth inlet, and the fifth inlet are distributed in sequence along the direction from the first inlet to the outlet;

[0012] In the present invention, preferably, the axis of the second inlet is perpendicular to the axis of the first inlet.

[0013] In the present invention, preferably, the axis of the third inlet is perpendicular to the axis of the fourth inlet.

[0014] In the present invention, preferably, the axis of the third inlet is parallel to the central axis of the nozzle body.

[0015] In the present invention, preferably, the axis of the fifth inlet is perpendicular to the central axis of the nozzle body.

[0016] In the present invention, preferably, the cross-sectional area of ​​the first inlet is smaller than the cross-sectional area of ​​the third inlet, where the cross-sectional area is perpendicular to the liquid inlet direction. The first and second inlets serve as start-up channels. In the initial stage of the reaction, a small amount of raw materials is introduced to initiate the reaction. After the reaction stabilizes, the third, fourth, and fifth inlets are activated.

[0017] In the present invention, the cross-sectional area of ​​the fifth inlet is determined according to the amount of the second gas introduced. Preferably, the cross-sectional area of ​​the fifth inlet is greater than the cross-sectional area of ​​the third inlet.

[0018] The utility model also provides a phosphorus pentachloride synthesis reactor, which comprises a reactor body and a nozzle arranged on the reactor body;

[0019] The nozzle includes a first nozzle, which is the aforementioned atomizing nozzle. The first nozzle is arranged at the top of the reactor body. The number of the first nozzle is at least one. The first inlet and the third inlet are both used for introducing phosphorus trichloride, the second inlet and the fourth inlet are both used for introducing carbon dioxide, and the fifth inlet is used for introducing a mixed gas.

[0020] In the present invention, the first nozzles are preferably arranged symmetrically with the center of the top of the reactor body as the axis. For example, when the first nozzles are an odd number, one of the first nozzles is arranged at the center of the top of the reactor body, and the remaining first nozzles are arranged symmetrically with the center of the top of the reactor body as the axis; when the first nozzles are an even number, the first nozzles are arranged symmetrically with the center of the top of the reactor body as the axis.

[0021] In the present invention, the number of the first nozzles can be adjusted according to the load, for example, three.

[0022] In the present invention, preferably, the angle between the axis of the outlet of the first nozzle and the inner wall surface of the reactor body is 90°.

[0023] In the present invention, when the number of the first nozzles is two or more, preferably, the distance D between adjacent first nozzles along the radial direction of the reactor body is not less than 20 to 50 times the diameter of the outlet of the first nozzle. If the distance between adjacent first nozzles is too small, the distribution of the phosphorus trichloride liquid particles will be affected, affecting the temperature control effect. If the distance is too large, the reactor volume will increase.

[0024] In the present invention, the phosphorus pentachloride synthesis reactor preferably further comprises a second nozzle disposed on the side of the reactor body for introducing a chlorine source. The chlorine source is preferably liquid chlorine. Upon entering the reactor body, the liquid chlorine absorbs heat and evaporates to produce chlorine gas, thereby providing chlorine gas and simultaneously cooling the reactor.

[0025] Preferably, there are at least two second nozzles, and the plurality of second nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center, so as to increase the distribution uniformity of the chlorine source inside the reactor body.

[0026] Wherein, the second nozzle is a conventional pressure nozzle in this field.

[0027] Preferably, the outlet of the second nozzle is inclined downward, and more preferably, the angle between the axis of the outlet of the second nozzle and the inner wall surface of the reactor body is 45-90°, for example, 60°.

[0028] The second nozzle is preferably located in a region close to the top of the reactor body, so that the chlorine source can participate in the reaction earlier.

[0029] In the present invention, the phosphorus pentachloride synthesis reactor preferably further comprises a third nozzle, disposed on the side of the reactor body, for introducing quenching gas to cool the interior of the reactor body. The quenching gas is preferably a mixture of carbon dioxide and chlorine.

[0030] Preferably, there are at least two third nozzles, and the plurality of third nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center, so as to improve the distribution uniformity of the quenching gas inside the reactor body.

[0031] Wherein, the third nozzle is a conventional pressure nozzle or air flow nozzle in the art.

[0032] Preferably, the outlet of the third nozzle is inclined downward. More preferably, the angle between the axis of the outlet of the third nozzle and the inner wall surface of the reactor body is 45-90°, for example, 60°.

[0033] Wherein, when the aforementioned second nozzle is provided, the third nozzle may be located below the second nozzle.

[0034] In a preferred embodiment of the present invention, the nozzle includes a first nozzle, a second nozzle and a third nozzle, there are three first nozzles, one of which is arranged at the center of the top of the reactor body, and the other first nozzles are symmetrically arranged with the center of the top of the reactor body as the axis; the second nozzle and the third nozzle are both arranged on the side of the reactor body, and the third nozzle is located below the second nozzle; there are two second nozzles, and the two second nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center; there are two third nozzles, and the two third nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center.

[0035] The utility model also provides a phosphorus pentachloride continuous synthesis system, which includes the phosphorus pentachloride synthesis reactor and a circulating fan. The reactor body of the phosphorus pentachloride synthesis reactor is provided with a chlorine source inlet, a circulating gas outlet, a circulating gas inlet and a discharge port;

[0036] The circulation fan is connected between the circulation gas outlet and the circulation gas inlet, and the fifth inlet of the first nozzle is connected to the circulation fan.

[0037] In the present invention, when the aforementioned second nozzle is provided, the second nozzle is provided on the chlorine source inlet.

[0038] In the present invention, when the third nozzle is provided, the third nozzle is provided on the circulating gas inlet, and the circulating gas outlet is connected to the third nozzle.

[0039] In the present invention, the circulating gas outlet is preferably arranged at the lower side of the reactor body.

[0040] In the present invention, the discharge port is preferably arranged at the bottom of the reactor body.

[0041] In the present invention, the phosphorus pentachloride continuous synthesis system may further include a cooling device, which is connected between the circulating fan and the circulating gas inlet and is used to cool the circulating gas.

[0042] Wherein, the cooling device can be a conventional heat exchanger in this field.

[0043] In the present invention, the phosphorus pentachloride continuous synthesis system may further include a gas purification and separation device, which is arranged between the circulating gas outlet and the circulating fan and is used to purify the circulating gas.

[0044] Wherein, the gas purification and separation device can be a bag dust collector.

[0045] In the present invention, the phosphorus pentachloride continuous synthesis system may further include a product tank, which is connected to the discharge port.

[0046] In the present utility model, the phosphorus pentachloride continuous synthesis system may further include a phosphorus trichloride storage tank, a first chlorine storage tank and a carbon dioxide storage tank. The phosphorus trichloride storage tank is connected to the first inlet and the third inlet of the first nozzle, the carbon dioxide storage tank is connected to the second inlet and the fourth inlet of the first nozzle, and the first chlorine storage tank is connected to the chlorine source inlet.

[0047] In the utility model, the circulating fan can also be connected to a second chlorine storage tank for replenishing chlorine to the circulating gas.

[0048] The utility model also provides a method for continuously synthesizing phosphorus pentachloride, which adopts the phosphorus pentachloride continuous synthesis system described above for synthesis, and comprises the following steps: introducing phosphorus trichloride liquid into the reactor body through the first nozzle, introducing a chlorine source into the reactor body through the chlorine source inlet, and carrying out a reaction.

[0049] In the present invention, the circulating gas includes chlorine and carbon dioxide, and the volume concentration of the chlorine is preferably 5-85%, for example 35%.

[0050] In the present invention, the velocity of the gas at the outlet of the first nozzle is preferably 0.1-300 m / s, for example 20 m / s. The velocity of the liquid at the outlet of the first nozzle is preferably 0.01-100 m / s, for example 1 m / s.

[0051] In the present invention, when the aforementioned second nozzle is provided, the pressure drop of the second nozzle is preferably 0.03-0.1 MPa, for example 0.05 MPa.

[0052] In the present invention, when the third nozzle is provided, the velocity of the outlet of the third nozzle is preferably 5 to 50 m / s, for example, 10 m / s.

[0053] The positive progress effect of this utility model is:

[0054] (1) The atomizing nozzle of the utility model can enhance gas-liquid mixing and control the size and shape of atomized particles.

[0055] (2) By arranging the atomizing nozzle of the present invention on the reactor body, the uniformity of the distribution of the material in the space of the reactor body is improved, and the high temperature area in the reactor body is reduced or eliminated. In some embodiments of the present invention, the temperature in the reactor can be controlled at 40°C;

[0056] The utility model further improves the heat exchange effect between the material and the heat exchange medium (such as the cooled circulating gas) by arranging multiple nozzles in layers on the side of the reactor body for introducing liquid chlorine and quenching gas.

[0057] (3) The utility model has a high raw material conversion rate (can reach 99%) and a high product purity (can reach 99.9%). BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 Schematic diagram of the nozzle structure.

[0059] Figure 2 Schematic diagram of the structure of the phosphorus pentachloride synthesis reactor.

[0060] Figure 3Schematic diagram of the structure of the continuous synthesis system of phosphorus pentachloride.

[0061] Description of Reference Numerals

[0062] First nozzle 1

[0063] Nozzle body 101

[0064] First entrance 102

[0065] Second entrance 103

[0066] The third entrance 104

[0067] Fourth Entrance 105

[0068] Fifth Entrance 106

[0069] Exit 107

[0070] Second nozzle 2

[0071] The third nozzle 3

[0072] Reactor body 4

[0073] Chlorine source inlet 401

[0074] Circulating gas outlet 402

[0075] Circulating gas inlet 403

[0076] Discharge port 404

[0077] Circulation fan 5

[0078] Cooling device 6

[0079] Gas purification and separation device 7

[0080] Phosphorus trichloride storage tank 8

[0081] Carbon dioxide storage tank 9

[0082] First chlorine storage tank 10

[0083] Second chlorine storage tank 11

[0084] Product tank 12 DETAILED DESCRIPTION

[0085] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0086] Example 1

[0087] This embodiment discloses an atomizing nozzle, such as Figure 1As shown, it includes: it includes a nozzle body 101 and a first inlet 102, a second inlet 103, a third inlet 104, a fourth inlet 105, a fifth inlet 106 and an outlet 107 provided on the nozzle body 101 and communicating with each other, the first inlet 102 and the third inlet 104 are both used for introducing liquid, the second inlet 103 and the fourth inlet 105 are both used for introducing a first gas, and the fifth inlet 106 is used for introducing a second gas;

[0088] The first inlet 102 is coaxially disposed at the top end of the nozzle body 101 , and the outlet 107 is coaxially disposed at the bottom end of the nozzle body 101 ;

[0089] The second inlet 103, the fourth inlet 105, and the fifth inlet 106 are all located on the side of the nozzle body 101. They are arranged sequentially from the first inlet 102 to the outlet 107. The axis of the second inlet 103 is perpendicular to the axis of the first inlet 102, the axis of the third inlet 104 is parallel to the central axis of the nozzle body 101, and the axis of the fourth inlet 105 is perpendicular to the axis of the third inlet 104. The second inlet 103 is located near the first inlet 102 and initially atomizes the liquid entering the first inlet 102 using the first gas entering the second inlet 103. The third inlet 104 is located on a branch line of the fourth inlet 105 and initially atomizes the liquid entering the third inlet 104 using the first gas entering the fourth inlet 105. The fifth inlet 106 is located near the outlet 107 and its axis is perpendicular to the central axis of the nozzle body 101. The outlet 107 has an inwardly converging structure with a converging angle of 60°.

[0090] The first inlet 102 and the second inlet 103 serve as the start-up channel. In the initial stage of the reaction, a small amount of raw materials are introduced to initiate the reaction. After the reaction stabilizes, the third inlet 104, the fourth inlet 105, and the fifth inlet 106 are activated. The cross-sectional area of ​​the first inlet 102 is smaller than that of the third inlet 104, and the cross-sectional area of ​​the fifth inlet 106 is larger than that of the third inlet 104.

[0091] Example 2

[0092] This embodiment discloses a phosphorus pentachloride synthesis reactor, such as Figure 2 As shown, it includes: a reactor body 4 and nozzles arranged on the reactor body 4. The reactor body 4 is a cylindrical structure, and the nozzles include a first nozzle 1, a second nozzle 2 and a third nozzle 3.

[0093] The first nozzle is the atomizing nozzle described in Example 1. There are three first nozzles 1, one of which is located at the center of the top of the reactor body 4, and the other two first nozzles 1 are symmetrically arranged with the center of the top of the reactor body 4 as the axis. The axis of the outlet of the first nozzle 1 is at an angle of 90° to the inner wall of the reactor body 4. The first inlet 102 and the third inlet 104 are both used to introduce phosphorus trichloride, the second inlet 103 and the fourth inlet 105 are both used to introduce carbon dioxide, and the fifth inlet 106 is used to introduce a mixed gas, which is a mixture of carbon dioxide and chlorine. The spacing D between adjacent first nozzles 1 is 20 times the diameter d of the outlet of the first nozzle 1.

[0094] The second nozzle 2 and the third nozzle 3 are both disposed on the side of the reactor body 4, with the third nozzle 3 located below the second nozzle 2. The second nozzle 2 is used to introduce a chlorine source. Two second nozzles 2 are symmetrically arranged around the axis of the reactor body 4 along the circumference of the reactor body 4. The outlets of the second nozzles 2 are angled downward, with the outlet axis of the second nozzle 2 forming an angle of 60° with the inner wall of the reactor body 4. The second nozzles 2 are pressure-type nozzles, and their structure is the same as that described in Example 1 of CN1164442A.

[0095] The third nozzle 3 is used to introduce quenching gas. There are two third nozzles 3. The two third nozzles 3 are symmetrically arranged along the circumference of the reactor body 4 with the axis of the reactor body 4 as the center. The outlet of the third nozzle 3 is inclined downward, and the angle between the outlet axis of the third nozzle 3 and the inner wall surface of the reactor body 4 is 60°; the third nozzle 3 is an airflow nozzle, and the airflow nozzle structure is the nozzle structure described in Example 2 in CN105057128B.

[0096] Example 3

[0097] This embodiment discloses a continuous synthesis system of phosphorus pentachloride. Figure 3 As shown, it includes: the phosphorus pentachloride synthesis reactor described in Example 2, a circulating fan 5, a cooling device 6, a gas purification and separation device 7, a phosphorus trichloride storage tank 8, a carbon dioxide storage tank 9, a first chlorine storage tank 10, a second chlorine storage tank 11 and a product tank 12.

[0098] The reactor body 4 is provided with a chlorine source inlet 401 , a circulating gas outlet 402 , a circulating gas inlet 403 and a discharge port 404 . The circulating gas outlet 402 is provided at the lower side of the reactor body, and the discharge port 404 is provided at the bottom of the reactor body 4 .

[0099] The second nozzle 2 is arranged on the chlorine source inlet 401, the third nozzle 3 is arranged on the circulating gas inlet 403, the circulating gas outlet 402 is connected to the third nozzle 3, the circulating fan 5 is connected between the circulating gas outlet 402 and the third nozzle 3, and the fifth inlet 106 of the first nozzle 1 is connected to the circulating fan 5 for receiving the circulating gas coming out of the circulating fan 5.

[0100] The gas purification and separation device 7, the circulating fan 5, and the cooling device 6 are sequentially connected between the circulating gas outlet 402 and the circulating gas inlet 403 along the circulating gas flow direction. The cooling device 6 is used to cool the circulating gas and is a heat exchanger. The gas purification and separation device 7 is used to purify the circulating gas and is a bag dust collector.

[0101] The phosphorus trichloride storage tank 8 is connected to the first inlet 102 and the third inlet 104 of the first nozzle 1, the carbon dioxide storage tank 9 is connected to the second inlet 103 and the fourth inlet 105 of the first nozzle 1, the first chlorine storage tank 10 is connected to the chlorine source inlet 401, and the first chlorine storage tank 10 contains liquid chlorine. The second chlorine storage tank 11 is connected to the circulating fan 5 for replenishing chlorine to the circulating gas. The product tank 12 is connected to the discharge port 404, and the bottom discharge port of the gas purification and separation device 7 is also connected to the product tank 12.

[0102] Phosphorus pentachloride is synthesized using the above-mentioned continuous synthesis system, and the synthesis method includes:

[0103] Phosphorus trichloride liquid is introduced into the reactor body 4 through the first nozzle 1 , and liquid chlorine is introduced into the reactor body 4 through the chlorine source inlet 401 to carry out the reaction.

[0104] The pressure in the reactor body 4 is normal pressure, the liquid raw material is phosphorus trichloride, the phosphorus trichloride flow rate is 13.7 tons / h, the circulating gas is a mixture of chlorine and carbon dioxide, the chlorine volume concentration is 35%, and the circulating gas volume is 9000Nm 3 / h, the set operating temperature is 40°C, the velocity of the gas at the outlet of the first nozzle is 20m / s, the velocity of the liquid at the outlet of the first nozzle is 1m / s; the pressure drop of the second nozzle is 0.05MPa, and the velocity of the outlet of the third nozzle is 10m / s.

[0105] The reaction results are:

[0106] The raw material conversion rate is 99%, the purity of the product phosphorus pentachloride is 99.9%, the D32 particle size of phosphorus pentachloride is 20-30 μm, and the maximum temperature in the furnace is 40°C. The nozzle and reactor have been operating continuously for one year without any problems, meeting the requirements for long-term stable and safe operation.

[0107] Comparative Example 1

[0108] This comparative example adopts the scheme described in Example 1 of patent CN116920764A for synthesis, wherein the phosphorus trichloride flow rate is 13.7 tons / h, the circulating gas volume is 14000Nm 3 / h.

[0109] The reaction results are:

[0110] The conversion rate of the raw materials is 96%, the purity of the product phosphorus pentachloride is 99.8%, the D32 particle size of the phosphorus pentachloride is 100-1000 μm, and the maximum temperature in the furnace is 80° C.

Claims

1. An atomizing nozzle, characterized in that: The nozzle comprises a nozzle body and a first inlet, a second inlet, a third inlet, a fourth inlet, a fifth inlet and an outlet arranged on the central axis of the nozzle body and connected to each other, wherein the first inlet and the third inlet are both used for introducing liquid, the second inlet and the fourth inlet are both used for introducing a first gas, and the fifth inlet is used for introducing a second gas; The first inlet is coaxially arranged at the top end of the nozzle body, and the outlet is coaxially arranged at the bottom end of the nozzle body. The second inlet, the third inlet, the fourth inlet and the fifth inlet are all arranged on the side of the nozzle body. The second inlet is close to the first inlet, and the liquid passed into the first inlet is preliminarily atomized by the first gas passed into the second inlet. The third inlet is arranged on a branch of the fourth inlet, and the liquid passed into the third inlet is preliminarily atomized by the first gas passed into the fourth inlet; the fifth inlet is close to the outlet, and the preliminarily atomized liquid is secondary atomized by the second gas passed into the fifth inlet.

2. The atomizing nozzle according to claim 1, characterized in that The outlet is an inwardly contracting structure with a contraction angle of 15 to 75 degrees, where the contraction angle refers to the angle between the side of the outlet and the cross section of the outlet; And / or, the second inlet, the fourth inlet, and the fifth inlet are distributed in sequence along the direction from the first inlet to the outlet; and / or, the axis of the second inlet is perpendicular to the axis of the first inlet; and / or, the axis of the third inlet is parallel to the central axis of the nozzle body; and / or, the axis of the fourth inlet is perpendicular to the axis of the third inlet; and / or, the axis of the fifth inlet is perpendicular to the central axis of the nozzle body; and / or, the cross-sectional area of ​​the first inlet is smaller than the cross-sectional area of ​​the third inlet, the cross-sectional area being a plane perpendicular to the liquid inlet direction; And / or, the cross-sectional area of ​​the fifth inlet is greater than the cross-sectional area of ​​the third inlet.

3. A phosphorus pentachloride synthesis reactor, characterized in that: It includes a reactor body and a nozzle arranged on the reactor body; The nozzle includes a first nozzle, which is the atomizing nozzle according to claim 1 or 2, and is arranged at the top of the reactor body. The number of the first nozzle is at least one, the first inlet and the third inlet are both used to introduce phosphorus trichloride, the second inlet and the fourth inlet are both used to introduce carbon dioxide, and the fifth inlet is used to introduce a mixed gas.

4. The phosphorus pentachloride synthesis reactor according to claim 3, characterized in that: The first nozzles are symmetrically arranged with the center of the top of the reactor body as the axis. When there are an odd number of the first nozzles, one of the first nozzles is arranged at the center of the top of the reactor body, and the other first nozzles are symmetrically arranged with the center of the top of the reactor body as the axis. When there are an even number of the first nozzles, the first nozzles are symmetrically arranged with the center of the top of the reactor body as the axis. When the number of the first nozzles is greater than or equal to two, the distance D between adjacent first nozzles along the radial direction of the reactor body is not less than 20 to 50 times the diameter of the outlet of the first nozzle; and / or, the number of the first nozzles is three; And / or, the angle between the axis of the outlet of the first nozzle and the inner wall surface of the reactor body is 90°.

5. The phosphorus pentachloride synthesis reactor according to claim 3 or 4, characterized in that: The phosphorus pentachloride synthesis reactor further includes a second nozzle, which is arranged on the side of the reactor body and is used to introduce a chlorine source; There are at least two second nozzles, and the plurality of second nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center; the second nozzle is a pressure nozzle; the outlet of the second nozzle is inclined downward, and the angle between the axis of the outlet of the second nozzle and the inner wall surface of the reactor body is 45 to 90 degrees; the second nozzle is located in the area near the top of the reactor body.

6. The phosphorus pentachloride synthesis reactor according to claim 3 or 4, characterized in that: The phosphorus pentachloride synthesis reactor further includes a third nozzle, which is disposed on the side of the reactor body and is used to introduce quenching gas. There are at least two third nozzles, and the plurality of third nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center. The third nozzle is an airflow nozzle. The outlet of the third nozzle is inclined downward, and the angle between the axis of the outlet of the third nozzle and the inner wall surface of the reactor body is 45 to 90 degrees. When the phosphorus pentachloride synthesis reactor further includes a second nozzle, the second nozzle is disposed on the side of the reactor body and is used to introduce a chlorine source, and the third nozzle is located below the second nozzle.

7. The phosphorus pentachloride synthesis reactor according to claim 3, characterized in that: The nozzles include a first nozzle, a second nozzle and a third nozzle. There are three first nozzles, one of which is arranged at the center of the top of the reactor body, and the other first nozzles are symmetrically arranged with the center of the top of the reactor body as the axis; the second nozzle and the third nozzle are both arranged on the side of the reactor body, and the third nozzle is located below the second nozzle; there are two second nozzles, and the two second nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center; there are two third nozzles, and the two third nozzles are symmetrically arranged along the circumference of the reactor body with the axis of the reactor body as the center.

8. A continuous synthesis system of phosphorus pentachloride, characterized in that: It comprises the phosphorus pentachloride synthesis reactor according to any one of claims 3 to 7 and a circulating fan, wherein the reactor body of the phosphorus pentachloride synthesis reactor is provided with a chlorine source inlet, a circulating gas outlet, a circulating gas inlet and a discharge port; The circulation fan is connected between the circulation gas outlet and the circulation gas inlet, and the fifth inlet of the first nozzle is connected to the circulation fan.

9. The phosphorus pentachloride continuous synthesis system according to claim 8, characterized in that: When a second nozzle is provided, the second nozzle is provided on the chlorine source inlet; When a third nozzle is provided, the third nozzle is provided on the circulating gas inlet, and the circulating gas outlet is connected to the third nozzle.

10. The phosphorus pentachloride continuous synthesis system according to claim 8, characterized in that: The circulating gas outlet is arranged at the lower side of the reactor body; And / or, the discharge port is arranged at the bottom of the reactor body; And / or, the phosphorus pentachloride continuous synthesis system further comprises a cooling device, the cooling device being connected between the circulating fan and the circulating gas inlet; the cooling device being a heat exchanger; And / or, the phosphorus pentachloride continuous synthesis system further comprises a gas purification and separation device, which is arranged between the circulating gas outlet and the circulating fan; the gas purification and separation device is a bag dust collector; And / or, the phosphorus pentachloride continuous synthesis system further comprises a product tank, wherein the product tank is connected to the discharge port; And / or, the phosphorus pentachloride continuous synthesis system further comprises a phosphorus trichloride storage tank, a first chlorine storage tank and a carbon dioxide storage tank, the phosphorus trichloride storage tank is connected to the first inlet and the third inlet of the first nozzle, the carbon dioxide storage tank is connected to the second inlet and the fourth inlet of the first nozzle, and the first chlorine storage tank is connected to the chlorine source inlet; And / or, the circulating fan is also connected to a second chlorine storage tank.

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