A single-jacketed reactor for the production of phosphorus trichloride with layered heating capability

Abstract

This utility model discloses a single-jacketed reactor for phosphorus trichloride production with layered heating capability. The reactor body is wrapped with a jacket, and the jacket is equipped with two layers of annular partitions. The jacket is divided into a bottom heat exchange chamber, a middle heat exchange chamber, and an upper heat exchange chamber by the two annular partitions. A heat exchange medium inlet is provided on one side of the jacket at the lower part of each of the bottom, middle, and upper heat exchange chambers, and a heat exchange medium outlet is provided on the other side of the jacket at the upper part of each of the bottom, middle, and upper heat exchange chambers. This utility model has a reasonable structure. During the production process, the temperature of the upper, middle, and lower layers of the reactor body can be controlled separately, thereby achieving strict control of the liquid phase temperature and gas phase temperature, ensuring output and quality. Moreover, a single jacket can achieve temperature control of all three layers. Compared with three separate jacket structures, the overall structure is better, the processing difficulty is reduced, and the cost is not significantly increased.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel technology, specifically a single-jacketed reaction vessel for the production of phosphorus trichloride that can be heated in layers. Background Technology

[0002] Phosphorus trichloride is an inorganic compound with the chemical formula PCl3. It decomposes in moist air and water to produce phosphorous acid and hydrochloric acid, and reacts with ethanol. It is soluble in diethyl ether, benzene, chloroform, carbon disulfide, and carbon tetrachloride. It reacts with oxygen to form phosphorus oxychloride. It can also be prepared by reacting excess phosphorus with chlorine gas. It is used as a chlorinating agent in organic synthesis (e.g., in the manufacture of saccharin), a catalyst, and a solvent.

[0003] Phosphorus trichloride production typically involves mixing a solution of liquid yellow phosphorus and phosphorus trichloride, heating it, then introducing chlorine gas and stirring to obtain liquid phosphorus trichloride. However, most current reactors do not have separate temperature control for the liquid and gas phases, resulting in lower production efficiency. Some reactors do allow for individual temperature control of each layer, but these reactors are generally custom-made, using two or more separate jackets to connect to the reactor body, increasing processing difficulty and costs significantly. Therefore, an improved technology is urgently needed to solve this problem in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a single-jacketed reactor for phosphorus trichloride production that can be heated in layers, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a single-jacketed reactor for phosphorus trichloride production with layered heating capability, comprising a reactor body, a jacket, an annular partition, and an annular support plate. A reactor cover is provided at the top of the reactor body. A motor is mounted on the upper surface of the reactor cover via a motor mount. The output shaft of the motor is connected to a main shaft via a coupling. A stirring paddle is connected to the bottom of the main shaft and is rotatably mounted within the reactor body. The reactor body is enclosed by a jacket. Two annular partitions are provided inside the jacket, dividing the jacket into a bottom heat exchange chamber, a middle heat exchange chamber, and an upper heat exchange chamber. Several annular support plates are provided within the jacket, specifically in the middle and upper heat exchange chambers. A heat exchange medium inlet is provided on one side of the jacket, specifically at the lower part of each of the bottom, middle, and upper heat exchange chambers. A heat exchange medium outlet is provided on the other side of the jacket, specifically at the upper part of each of the bottom, middle, and upper heat exchange chambers.

[0006] The annular partition includes an annular upper plate, an annular lower plate, and an annular heat insulation plate. The annular heat insulation plate is sandwiched between the annular upper plate and the annular lower plate. The outer ends of the annular upper plate and the annular lower plate are connected to the inner wall of the jacket. Annular grooves are formed on the inner sides of the annular upper plate and the annular lower plate. A sealing ring is provided in each annular groove. The sealing ring is tightly fitted to the outer wall of the vessel. A reinforcing plate is provided on the upper surface of the annular upper plate and the lower surface of the annular lower plate. The outer ends of the reinforcing plates are connected to the inner wall of the jacket.

[0007] Preferably, the present invention provides a single-jacketed reactor for phosphorus trichloride production with layered heating, wherein the bottom end of the reactor body is provided with a discharge port, and the discharge port passes through the bottom heat exchange chamber at the bottom of the jacket.

[0008] Preferably, the present invention provides a single-jacketed reactor for phosphorus trichloride production that can be heated in layers, wherein the upper surface of the reactor cover is provided with at least two feed inlets, one pressure gauge port and one exhaust port, and the reactor cover is also connected to a chlorine gas inlet pipe, which is close to the inner wall of the reactor and extends to the bottom of the reactor body.

[0009] Preferably, the present invention provides a single-jacketed reactor for phosphorus trichloride production with layered heating, wherein temperature sensor mounting cylinders are installed in the bottom heat exchange chamber, the middle heat exchange chamber and the upper heat exchange chamber of the jacket, and the temperature sensor mounting cylinders also pass through the side wall of the reactor body.

[0010] Preferably, the present invention provides a single-jacketed reactor for the production of phosphorus trichloride that can be heated in layers, wherein the annular support plate has several through slots.

[0011] Preferably, the present invention provides a single-jacketed reactor for phosphorus trichloride production that can be heated in layers, wherein the outer surface of the jacket is provided with several support seats.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) A jacket is provided on the outside of the vessel body, and two annular partitions are provided inside the jacket. The two annular partitions divide the vessel body into three chambers: bottom heat exchange chamber, middle heat exchange chamber and upper heat exchange chamber. During the production process, the temperature of the upper, middle and lower layers of the vessel body can be controlled separately, thereby achieving strict control of liquid phase temperature and gas phase temperature, ensuring output and quality.

[0014] (2) The temperature control of three layers can be achieved by using one jacket. Compared with three separate jacket structures, the overall structure is better, the processing difficulty is reduced, and the cost is not significantly increased.

[0015] (3) An annular heat insulation plate is sandwiched between the two annular partitions. The annular heat insulation plate reduces the mutual influence between the media inside the bottom heat exchange cavity, the middle heat exchange cavity and the upper heat exchange cavity, thereby further improving the accuracy of temperature control.

[0016] (4) Reinforcing plates are provided at the connection between the upper surface of the annular upper plate and the lower surface of the annular lower plate and the jacket to reduce the probability of deformation of the annular partition and thus improve the service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 For the appendix Figure 1 An enlarged structural diagram of point A in the middle.

[0019] In the figure: 1. Reactor body; 2. Jacket; 3. Annular partition plate; 4. Annular support plate; 5. Reactor cover; 6. Motor; 7. Motor base; 8. Main shaft; 9. Stirring paddle; 10. Bottom heat exchange chamber; 11. Middle heat exchange chamber; 12. Upper heat exchange chamber; 13. Heat exchange medium inlet; 14. Heat exchange medium outlet; 15. Sealing ring; 16. Reinforcing plate; 17. Discharge port; 18. Feed inlet; 19. Pressure gauge port; 20. Exhaust port; 21. Chlorine gas inlet pipe; 22. Temperature sensor mounting cylinder; 23. Support base; 301. Annular upper plate; 302. Annular lower plate; 303. Annular heat insulation plate. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device 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 utility model.

[0022] Please see Figure 1-2This utility model provides a technical solution: a single-jacketed reactor for phosphorus trichloride production with layered heating, comprising a reactor body 1, a jacket 2, an annular partition 3, and an annular support plate 4. A reactor cover 5 is provided at the top of the reactor body 1. A motor 6 is mounted on the upper surface of the reactor cover 5 via a motor base 7. The upper surface of the reactor cover 5 also has at least two feed inlets 18, a pressure gauge port 19, and an exhaust port 20. A chlorine gas inlet pipe 21 is also connected through the reactor cover 5, and the chlorine gas inlet pipe 21 is close to the inner wall of the reactor body 1 and extends... At the bottom of the vessel body 1, two feed inlets 18 respectively feed a mixed solution of liquid yellow phosphorus and phosphorus trichloride. A pressure gauge port 19 is used to install a pressure gauge for monitoring the internal pressure of the vessel body 1. An exhaust port 20 allows steam to be discharged during production. A chlorine inlet pipe 21 is used for adding chlorine. The output shaft of the motor 6 is connected to the main shaft 8 via a coupling. A stirring paddle 9 is connected to the bottom of the main shaft 8 and rotates within the vessel body 1. The vessel body 1 is externally encased in a jacket 2. Inside the jacket 2... The jacket 2 is equipped with two layers of annular partitions 3. The jacket 2 is divided into a bottom heat exchange chamber 10, a middle heat exchange chamber 11, and an upper heat exchange chamber 12 by the two annular partitions 3. Several annular support plates 4 are installed within the jacket 2, specifically within the middle heat exchange chamber 11 and the upper heat exchange chamber 12. Each annular support plate 4 has several through slots to ensure that the heat exchange medium can smoothly pass through the annular support plates 4 within the middle heat exchange chamber 11 and the upper heat exchange chamber 12. The jacket 2 is further divided into three sections: the bottom heat exchange chamber 10, the middle heat exchange chamber 11, and the upper heat exchange chamber 12. Each of the upper heat exchange chambers 12 is provided with a heat exchange medium inlet 13 at its lower part. On the other side of the jacket 2, the bottom heat exchange chamber 10, the middle heat exchange chamber 11 and the upper heat exchange chamber 12 are each provided with a heat exchange medium outlet 14 at their upper parts. The bottom end of the vessel body 1 is provided with a discharge port 17, which passes through the bottom heat exchange chamber 10 at the bottom of the jacket 2. The discharge port 17 is used to discharge phosphorus trichloride liquid. Several support seats 23 are provided on the outer surface of the jacket 2 to achieve the connection and fixation between the whole and the platform.

[0023] The jacket 2 is equipped with temperature sensor mounting cylinders 22 at the bottom heat exchange chamber 10, the middle heat exchange chamber 11 and the upper heat exchange chamber 12. The temperature sensor mounting cylinders 22 also pass through the side wall of the vessel body 1 to install three temperature sensors respectively. The two temperature sensors at the bottom and top monitor the temperature of the liquid phase and the gas phase respectively, and the middle temperature sensor monitors the temperature according to the liquid level.

[0024] The annular partition 3 includes an annular upper plate 301, an annular lower plate 302, and an annular heat insulation plate 303. The annular heat insulation plate 303 is sandwiched between the annular upper plate 301 and the annular lower plate 302. The outer ends of the annular upper plate 301 and the annular lower plate 302 are connected to the inner wall of the jacket 2. Annular grooves are provided on the inner sides of the annular upper plate 301 and the annular lower plate 302. A sealing ring 15 is provided in each annular groove. The sealing ring 15 is tightly fitted with the outer wall of the vessel body 1. A reinforcing plate 16 is provided on the upper surface of the annular upper plate 301 and the lower surface of the annular lower plate 302. The outer end of the reinforcing plate 16 is connected to the inner wall of the jacket 2.

[0025] Installation method and operating principle: First, weld the outer ends of the annular upper plate 301 and the annular lower plate 302 to the inner wall of the jacket 2. Then, fill the space between the annular upper plate 301 and the annular lower plate 302 with an annular heat insulation plate 303 (the annular heat insulation plate 303 can be multiple spliced ​​heat insulation plates). At this time, the annular upper plate 301, the annular lower plate 302, and the annular heat insulation plate 303 constitute an annular partition 3, and a total of two layers of annular partition 3 are made. Subsequently, weld several reinforcing plates 16 at the connection between the annular upper plate 301 and the annular lower plate 302 and the jacket 2. Next, weld the annular support plate 4 with through grooves to the inner wall of the jacket 2. Then, insert the sealing ring 15 into the annular groove on the inner side of the annular upper plate 301 and the annular lower plate 302, and put the jacket 2 on the outside of the vessel body 1. The top of the jacket 2 is welded to the outer wall of the vessel body 1. A pre-drilled hole is provided at the bottom of the jacket 2. The discharge port 17 passes through the hole at the bottom of the jacket 2 and is welded to the hole at the bottom of the vessel body 1. Holes are provided on the side walls of the jacket 2 and the vessel body 1 at the bottom heat exchange chamber 10, the middle heat exchange chamber 11, and the upper heat exchange chamber 12 to install the temperature sensor mounting cylinder 22. The temperature sensor mounting cylinder 22 is welded to the jacket 2 and the vessel body 1 respectively. The motor 6 is installed on the upper surface of the motor base 7 on the upper surface of the vessel cover 5. The top end of the main shaft 8, which is connected to the stirring paddle 9, is connected to the output shaft of the motor 6 through a coupling. The cover is also welded with a chlorine gas inlet pipe 21. After the cover is lifted, the bottom of the stirring paddle 9 and the chlorine gas inlet pipe 21 are placed into the vessel body 1. The vessel body 1 is connected to the cover by bolts or welding to complete the installation. Before use, three heat exchange medium pipelines are connected to the heat exchange medium inlet 13 and heat exchange medium outlet 14 corresponding to the bottom heat exchange chamber 10, the middle heat exchange chamber 11, and the upper heat exchange chamber 12, respectively. A mixed solution of liquid yellow phosphorus and phosphorus trichloride (phosphorus trichloride mother liquor) is added into the reactor body 1 through the feed inlet 18. The motor 6 is started, driving the main shaft 8 and the stirring paddle 9 to rotate, thereby achieving stirring. Heat exchange medium (hot gas or hot oil) is introduced into the bottom heat exchange chamber 10, the middle heat exchange chamber 11, and the upper heat exchange chamber 12. The temperature of the middle heat exchange chamber 11 can be flexibly adjusted according to the liquid level, thereby controlling the liquid phase at 78–85℃ and the gas phase at 76–78℃. Under normal circumstances, the medium temperature in the middle heat exchange chamber can be lower than 76℃ to achieve cooling of the gas phase. Finally, liquid phosphorus trichloride is obtained, which is then purified by distillation to prepare the finished phosphorus trichloride product.This utility model has a reasonable structure. The vessel body 1 is equipped with a jacket 2 on the outside, and two layers of annular baffles 3 are set inside the jacket 2. The two layers of annular baffles 3 divide the vessel body 1 into three chambers: a bottom heat exchange chamber 10, a middle heat exchange chamber 11, and an upper heat exchange chamber 12. During the production process, the temperature of the upper, middle, and lower layers of the vessel body 1 can be controlled separately, thereby achieving strict control of the liquid phase temperature and the gas phase temperature, ensuring output and quality. At the same time, the temperature control of the three layers can be achieved with a single jacket 2, which is better than the structure of three separate jackets 2. The overall structure is better, the processing difficulty is reduced, and the cost is not significantly increased. Annular heat insulation plates 303 are sandwiched between the two layers of annular baffles 3. The annular heat insulation plates 303 reduce the mutual influence of the media inside the bottom heat exchange chamber 10, the middle heat exchange chamber 11, and the upper heat exchange chamber 12, further improving the accuracy of temperature control. Reinforcing plates 16 are set at the connection between the upper surface of the annular upper plate 301 and the lower surface of the annular lower plate 302 and the jacket 2, reducing the probability of deformation of the annular baffles 3 and thus improving the service life.

[0026] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0027] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A single-jacketed reactor for the production of phosphorus trichloride with layered heating capability, characterized in that: The vessel includes a vessel body (1), a jacket (2), an annular partition (3), and an annular support plate (4). A vessel cover (5) is provided at the top of the vessel body (1). A motor (6) is mounted on the upper surface of the vessel cover (5) via a motor mount (7). The output shaft of the motor (6) is connected to a main shaft (8) via a coupling. A stirring paddle (9) is connected to the bottom of the main shaft (8). The stirring paddle (9) is rotatably mounted inside the vessel body (1). The vessel body (1) is enclosed by a jacket (2). Two annular partitions (3) are provided inside the jacket (2). The jacket (2) is divided into two layers by the two annular partitions (3). The jacket (2) is divided into a bottom heat exchange chamber (10), a middle heat exchange chamber (11), and an upper heat exchange chamber (12). Several annular support plates (4) are provided inside the jacket (2) and in the middle heat exchange chamber (11) and the upper heat exchange chamber (12). A heat exchange medium inlet (13) is provided on one side of the jacket (2) and at the lower part of each of the bottom heat exchange chamber (10), the middle heat exchange chamber (11), and the upper heat exchange chamber (12). A heat exchange medium outlet (14) is provided on the other side of the jacket (2) and at the upper part of each of the bottom heat exchange chamber (10), the middle heat exchange chamber (11), and the upper heat exchange chamber (12). The annular partition (3) includes an annular upper plate (301), an annular lower plate (302), and an annular heat insulation plate (303). The annular heat insulation plate (303) is sandwiched between the annular upper plate (301) and the annular lower plate (302). The outer ends of the annular upper plate (301) and the annular lower plate (302) are connected to the inner wall of the jacket (2). Annular grooves are provided on the inner sides of the annular upper plate (301) and the annular lower plate (302). A sealing ring (15) is provided in each of the annular grooves. The sealing ring (15) is tightly fitted to the outer wall of the vessel body (1). A reinforcing plate (16) is provided on the upper surface of the annular upper plate (301) and the lower surface of the annular lower plate (302). The outer end of the reinforcing plate (16) is connected to the inner wall of the jacket (2).

2. The single-jacketed reaction kettle for producing phosphorus trichloride that can be heated in layers according to claim 1, characterized in that: The bottom end of the vessel body (1) is provided with a discharge port (17), which is inserted into the bottom heat exchange chamber (10) at the bottom of the jacket (2).

3. The single-jacketed reactor for producing phosphorus trichloride according to claim 1, characterized in that: The upper surface of the lid (5) is also provided with at least two feed inlets (18), a pressure gauge port (19) and an exhaust port (20). The lid (5) is also connected to a chlorine gas inlet pipe (21), which is close to the inner wall of the body (1) and extends to the bottom of the body (1).

4. The single-jacketed reaction kettle for producing phosphorus trichloride that can be heated in layers according to claim 1, characterized in that: The jacket (2) is equipped with temperature sensor mounting cylinders (22) at the bottom heat exchange chamber (10), the middle heat exchange chamber (11) and the upper heat exchange chamber (12), and the temperature sensor mounting cylinders (22) also pass through the side wall of the vessel body (1).

5. The single-jacketed reactor for producing phosphorus trichloride according to claim 1, characterized in that: The annular support plate (4) has several through slots.

6. The single-jacketed reaction kettle for producing phosphorus trichloride that can be heated in layers according to claim 1, characterized in that: The outer surface of the jacket (2) is provided with several support seats (23).

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