Distillation kettle for producing trioctyl phosphate

Abstract

A distillation still used during production of trioctyl phosphate relates to a distillation still, a motor is arranged in the middle of the upper end of a still body, and stirring blades are arranged at the lower end of a rotating shaft, penetrating into a still cavity of the still body, of the motor; a feeding pipe, a pressure gauge and a vacuum pipe are respectively arranged around the motor at the upper end of the kettle body; a plurality of inner dripping pipes embedded into a kettle cavity of the kettle body are arranged on the oxygen and phosphorus distribution pipe at the upper part of the kettle body; the upper heating ring sleeve is arranged on the outer edge of the middle of the kettle body, the middle heating ring sleeve is arranged on the outer edge of the lower portion of the kettle body, the lower heating ring sleeve wraps the kettle body close to the lower end and the bottom of the kettle body, and the middle of a bottom plate of the kettle body is connected with an isooctanol feeding and discharging pipe. The upper heating ring sleeve, the middle heating ring sleeve and the lower heating ring sleeve are respectively arranged at the lower part of the kettle body, so that the bottom high temperature and the upper temperature of the kettle body are gradually reduced, and the aim of fully distilling trioctyl phosphate is fulfilled.

Description

Technical Field

[0001] The utility model relates to a distillation kettle, in particular to a distillation kettle used in producing trioctyl phosphate. Background Art

[0002] Trioctyl phosphate (TOP) is a widely used phosphate compound. The chemical formula of trioctyl phosphate is C24H51O4P. It is a colorless to light yellow liquid with low volatility. Trioctyl phosphate is mainly used as a solvent, lubricant and antistatic agent. Due to its high thermal stability and chemical stability, trioctyl phosphate is widely used in synthetic resins, plastics, lubricating oils and fire suppressants. It can also be used as a component of liquid-liquid extractants, extractants and catalysts. The reaction raw materials of trioctyl phosphate are isooctyl alcohol and phosphorus oxychloride (dropwise addition). The reaction process includes dropwise addition of heat preservation, neutralization water washing, alcohol distillation and refining. In the distilled water washing and dehydration process of the distillation kettle, the water is separated slowly at the bottom of the trioctyl phosphate liquid because the mass of water is heavier than that of trioctyl phosphate. The main reason is that the temperature at the bottom of the distillation kettle cannot reach a temperature higher than that at the top. Utility Model Content

[0003] The purpose of the present invention is to solve the problems in the prior art and disclose a distillation kettle used for producing trioctyl phosphate. The three heating rings, upper, middle and lower, are arranged at the lower part of the kettle body respectively, so as to achieve high temperature at the bottom of the kettle body and decreasing temperature at the upper part, thereby achieving the purpose of sufficient distillation of trioctyl phosphate.

[0004] In order to achieve the invention purpose of this disclosure, this application discloses the following technical solutions:

[0005] A distillation kettle used in producing trioctyl phosphate comprises a kettle body, a motor, a stirring blade, a feed pipe, a pressure gauge, a vacuum tube, a phosphorus oxychloride distribution pipe, an upper heating ring sleeve, a middle heating ring sleeve, a lower heating ring sleeve and isooctyl alcohol inlet and outlet pipes. A motor is arranged in the middle of the upper end of the kettle body, and a stirring blade is arranged at the lower end of a rotating shaft of the motor which penetrates into a kettle cavity of the kettle body; a feed pipe, a pressure gauge and a vacuum tube are arranged around the motor at the upper end of the kettle body respectively, and a plurality of inner dripping pipes embedded in the kettle cavity of the kettle body are arranged on the phosphorus oxychloride distribution pipe at the upper part of the kettle body; an upper heating ring sleeve is arranged at the middle outer edge of the kettle body, a middle heating ring sleeve is arranged at the lower outer edge of the kettle body, a lower heating ring sleeve is wrapped around the lower end of the kettle body and the bottom of the kettle body, and the isooctyl alcohol inlet and outlet pipes are connected to the middle of the bottom plate of the kettle body.

[0006] The distillation kettle used in producing trioctyl phosphate has a motor support in the middle of the upper end of the kettle body, a rotating shaft of a motor arranged on the motor support passes through the motor support and the kettle body, and a stirring blade is arranged on the outer edge of the lower end of the rotating shaft.

[0007] The distillation kettle used in producing trioctyl phosphate is provided with valves on the feed pipe and the vacuum pipe respectively.

[0008] The distillation kettle used for producing trioctyl phosphate has a phosphorus oxychloride distribution pipe on the upper part of the kettle body in a C-shaped structure, one end of the phosphorus oxychloride distribution pipe is closed, and the other end of the phosphorus oxychloride distribution pipe is connected to a phosphorus oxychloride container through a phosphorus oxychloride feeding pipe. A plurality of tees are arranged at intervals on the phosphorus oxychloride distribution pipe of the C-shaped structure, and the interfaces of the plurality of tees facing the kettle body are respectively fixedly connected to the outer ends of the inner dripping pipe, and the outer edge of the middle part of the inner dripping pipe is fixedly connected to the kettle body.

[0009] In the distillation kettle used for producing trioctyl phosphate, the phosphorus oxychloride feed pipe is fixed on the upper outer edge surface of the kettle body through a plurality of fixing sleeves.

[0010] The distillation kettle used in the production of trioctyl phosphate is divided into an upper kettle body and a lower kettle body, an upper flange is arranged at the lower end of the upper kettle body, and a lower flange is arranged at the upper end of the lower kettle body. The upper flange of the upper kettle body is buckled on the lower flange of the lower kettle body, and the upper flange and the lower flange are connected by locking screws. Sealing rings are arranged on the opposite surfaces of the upper flange and the lower flange, and handles are respectively arranged on both sides of the middle of the upper kettle body.

[0011] The distillation kettle used in the production of trioctyl phosphate is provided with a connecting ring plate B on the upper end surface of the lower heating ring sleeve, and a raised ring is provided in the middle of the bottom plate of the lower heating ring sleeve; the middle opening of the connecting ring plate B of the lower heating ring sleeve is fixedly connected to the outer edge of the lower kettle body near the lower end, the upper opening of the raised ring is fixedly connected to the middle concave bottom plate of the lower kettle body, and the middle concave bottom plate in the middle of the raised ring is provided with an isooctyl alcohol inlet and outlet pipe installation port, and the highest temperature cavity is formed between the lower heating ring sleeve, the connecting ring plate B, the bottom plate and the middle concave bottom plate; a lower heat medium inlet is provided on the upper part of one side of the lower heating ring sleeve, and a lower heat medium outlet is provided on the bottom plate; the lower end of the middle heating ring sleeve is fixedly connected to the lower heating ring sleeve The upper end of the middle heating ring sleeve is fixedly connected to the upper end of the middle heating ring sleeve, and the inner mouth of the connecting ring plate arranged at the upper mouth of the middle heating ring sleeve is fixedly connected to the lower outer edge of the lower kettle body, and a high-temperature cavity is formed between the middle heating ring sleeve and the connecting ring plate, the connecting ring plate B and the outer edge of the lower kettle body, and a middle heat medium inlet and a middle heat medium outlet are respectively provided at the upper and lower parts of one side of the middle heating ring sleeve; the lower end of the upper heating ring sleeve is fixedly connected to the upper end of the middle heating ring sleeve, and the inner mouth of the connecting ring plate A arranged at the upper mouth of the upper heating ring sleeve is fixedly connected to the lower middle outer edge of the lower kettle body, and a secondary temperature cavity is formed between the upper heating ring sleeve and the connecting ring plate, the connecting ring plate A and the outer edge of the lower kettle body, and an upper heat medium inlet and an upper heat medium outlet are respectively provided at the upper and lower parts of one side of the upper heating ring sleeve.

[0012] The distillation kettle used for producing trioctyl phosphate has a lower heating ring sleeve which is fixedly connected to the upper ends of a plurality of legs on all sides.

[0013] The distillation kettle used in producing trioctyl phosphate is provided with inlet and outlet valves on the isooctyl alcohol inlet and outlet pipes.

[0014] Through the above disclosure, the beneficial effects of the present disclosure are:

[0015] The distillation kettle used for producing trioctyl phosphate disclosed in the present invention has an internal dripping pipe arranged at the upper part of the kettle body to enable phosphorus oxychloride to be dripped during the stirring process; the kettle body is arranged as an upper kettle body and a lower kettle body, which is convenient for cleaning after use; three upper, middle and lower heating rings are arranged from top to bottom at the lower part of the kettle body, respectively, so that the temperature of the bottom of the kettle body is higher than that of the upper part and the temperature decreases gradually, thereby achieving the purpose of fully distilling trioctyl phosphate; the present invention arranges an upper heating ring, a middle heating ring and a lower heating ring that can wrap the bottom of the kettle body at the lower outside of the kettle body, so that the temperature of the bottom during use can be higher than that of the upper part, thereby achieving rapid heating and gasification of the moisture at the bottom, thereby accelerating the speed of trioctyl phosphate in the distilled water washing and dehydration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the internal structure of the present disclosure;

[0017] Figure 2 is a schematic diagram of the structure of the present disclosure;

[0018] Figure 3 It is a schematic diagram of the lower kettle structure of the present invention;

[0019] Figure 4 It is a schematic diagram of the upper heating ring structure disclosed in the present invention;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the upper heating ring sleeve disclosed in the present invention;

[0021] Figure 6 is a schematic diagram of the lower heating ring structure disclosed in the present invention;

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the lower heating ring sleeve disclosed in the present invention;

[0023] In the figure: 1. Motor; 2. Valve; 3. Feed pipe; 4. Pressure gauge; 5. Vacuum tube; 6. Phosphorus oxychloride distribution pipe; 7. Inner drip pipe; 8. Upper kettle body; 9. Handle; 10. Locking screw; 11. Upper flange; 12. Sealing ring; 13. Lower flange; 14. Upper heat medium inlet; 15. Upper heating ring; 16. Rotating shaft; 17. Upper heat medium outlet; 18. Middle heat medium inlet; 19. Stirring blade; 20. Middle heating ring; 21. Middle heat medium outlet; 22. Lower heat medium inlet; 23. Lower heating ring; 24. Lower heat medium outlet; 25. Isooctyl alcohol Inlet and outlet pipes; 26, inlet and outlet valves; 27, supporting legs; 28, highest temperature chamber; 29, middle recessed bottom plate; 30, high temperature chamber; 31, lower kettle body; 32, sub-temperature chamber; 33, kettle chamber; 34, fixing sleeve; 35, upper medium connecting inlet pipe; 36, upper medium connecting outlet pipe; 37, middle medium connecting inlet pipe; 38, middle medium connecting outlet pipe; 39, lower medium connecting inlet pipe; 40, lower medium connecting outlet pipe; 41, three-way pipe; 42, phosphorus oxychloride feeding pipe; 43, motor support; 44, installation port; 45, connecting ring plate A; 46, connecting ring plate B; 47, raised ring; 48, bottom plate. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so as to more clearly understand the invention objectives, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to explain that the technical solution of the present invention is not limited to one implementation method.

[0025] Combined with Figures 1 to 7The distillation kettle used in the production of trioctyl phosphate described in the invention comprises a kettle body, a motor 1, a stirring blade 19, a feed pipe 3, a pressure gauge 4, a vacuum tube 5, a phosphorus oxychloride distribution pipe 6, an upper heating ring sleeve 15, a middle heating ring sleeve 20, a lower heating ring sleeve 23 and a discharge pipe 25. A motor support 43 is arranged in the middle of the upper end of the kettle body. A rotating shaft 16 of the motor 1 arranged on the motor support 43 passes through the motor support 43 and the kettle body, and a stirring blade 19 is arranged at the outer edge of the lower end of the rotating shaft 16; a feed pipe 3, a pressure gauge 4 and a vacuum tube 5 are arranged around the motor 1 at the upper end of the kettle body, and valves 2 are arranged on the feed pipe 3 and the vacuum tube respectively; the phosphorus oxychloride distribution pipe 6 at the upper part of the kettle body is in a C-shaped structure, one end of the phosphorus oxychloride distribution pipe 6 is in a closed state, and the other end of the phosphorus oxychloride distribution pipe 6 is connected to the phosphorus oxychloride container through a phosphorus oxychloride feed pipe 42. A valve is arranged on the pipe 42, and a booster device is arranged on the phosphorus oxychloride container. A plurality of tee pipes 41 are arranged at intervals on the phosphorus oxychloride distribution pipe 6 of the C-shaped structure. The interfaces of the plurality of tee pipes 41 facing the kettle body are fixedly connected with the outer ends of the inner drip pipe 7 respectively, and the middle outer edge of the inner drip pipe 7 is fixedly connected with the kettle body. The phosphorus oxychloride feeding pipe 42 is fixed on the upper outer edge surface of the kettle body through a plurality of fixed sleeves 34; the phosphorus oxychloride distribution pipe 6 at the upper part of the kettle body is provided with a plurality of inner drip pipes 7 embedded in the kettle cavity 33 of the kettle body; the upper heating ring sleeve 15 is arranged on the middle outer edge of the kettle body, the middle heating ring sleeve 20 is arranged on the lower outer edge of the kettle body, the lower heating ring sleeve 23 is wrapped around the lower end of the kettle body and the bottom of the kettle body, the middle part of the bottom plate 29 of the kettle body is connected to the discharge pipe 25, and the discharge pipe 25 is provided with a feed inlet and discharge valve 26, and the surrounding of the lower heating ring sleeve 23 is respectively fixedly connected to the upper ends of a plurality of legs 27.

[0026] Combined with Figure 1 , 2 Or 3, the kettle body is divided into an upper kettle body 8 and a lower kettle body 31, an upper flange 11 is provided at the lower end of the upper kettle body 8, and a lower flange 13 is provided at the upper end of the lower kettle body 31. The upper flange 11 of the upper kettle body 8 is buckled on the lower flange 13 of the lower kettle body 31, and the upper flange 11 and the lower flange 13 are connected by locking screws 10. A sealing ring 12 is provided on the opposite surfaces of the upper flange 11 and the lower flange 13, and handles 9 are respectively provided on both sides of the middle of the upper kettle body 8.

[0027] Combined with Figure 1 , 2, 4, 5, 6 or 7, a connecting ring plate B46 is provided on the upper end surface of the lower heating ring sleeve 23, and a raised ring 47 is provided in the middle of the bottom plate 48 of the lower heating ring sleeve 23; the middle opening of the connecting ring plate B46 of the lower heating ring sleeve 23 is fixedly connected to the outer edge of the lower end of the lower kettle body 31, the upper opening of the raised ring 47 is fixedly connected to the middle recessed bottom plate 29 of the lower kettle body 31, and a discharge pipe 25 mounting opening 44 is provided on the middle recessed bottom plate 29 in the middle of the raised ring 47, and a highest temperature cavity 28 is formed between the lower heating ring sleeve 23, the connecting ring plate B46, the bottom plate 48 and the middle recessed bottom plate 29; a lower heat medium inlet 22 is provided on the upper part of one side of the lower heating ring sleeve 23, and a lower heat medium outlet 24 is provided on the bottom plate 48; the lower end of the middle heating ring sleeve 20 is fixedly connected to the upper end of the lower heating ring sleeve 23 The middle heating ring sleeve 20 has an inner opening arranged at the upper opening of the middle heating ring sleeve 20 and is fixedly connected to the lower outer edge of the lower kettle body 31, and a high-temperature cavity 30 is formed between the middle heating ring sleeve 20 and the connecting ring plate, the connecting ring plate B46 and the outer edge of the lower kettle body 31, and a middle heat medium inlet 18 and a middle heat medium outlet 21 are respectively arranged at the upper and lower parts of one side of the middle heating ring sleeve 20; the lower end of the upper heating ring sleeve 15 is fixedly connected to the upper end of the middle heating ring sleeve 20, and the inner opening of the connecting ring plate A45 arranged at the upper opening of the upper heating ring sleeve 15 is fixedly connected to the lower middle outer edge of the lower kettle body 31, and a secondary temperature cavity 32 is formed between the upper heating ring sleeve 15 and the connecting ring plate, the connecting ring plate A45 and the outer edge of the lower kettle body 31, and an upper heat medium inlet 14 and an upper heat medium outlet 17 are respectively arranged at the upper and lower parts of one side of the upper heating ring sleeve 15.

[0028] The distillation kettle used in the production of trioctyl phosphate described in the present disclosure is combined with the attached Figures 1 to 7The present invention is used in the process of dripping, heat preservation, neutralization, water washing, alcohol distillation and refining of trioctyl phosphate; wherein the use of the dripping, heat preservation and alcohol distillation process, first ensure that the kettle body is clean, turn on the vacuum pump connected to the vacuum tube 5 of the present invention to make the distillation kettle body in a vacuum state, the vacuum degree is less than -0.070Mpa, then open the inlet and outlet valve 26 to allow isooctyl alcohol to enter the valve body through the isooctyl alcohol inlet and outlet pipe 25 according to the metering setting, and close the isooctyl alcohol inlet and outlet pipe 26 after the isooctyl alcohol has entered. The inlet and outlet valves 26 on the pipe 25 are turned on the motor 1 to start stirring the stirring blade 19. During stirring, the temperature should drop to about 0-5°C. The valve of the phosphorus oxychloride feeding pipe 42 is opened to allow the phosphorus oxychloride metering tank in a vacuum state to start to be distributed through the phosphorus oxychloride feeding pipe 42 and then enter the kettle body through the inner drip pipe 7. Then, the upper heating ring sleeve 15, the middle heating ring sleeve 20 and the lower heating ring sleeve 23 are heated respectively using oil medium to raise the kettle body temperature to 15°C. The valve 2 of the feeding pipe 3 is opened and adjusted to a large The cold brine is metered into the kettle body. At this time, the upper heating ring 15, the middle heating ring 20 and the lower heating ring 23 at the lower part of the kettle body are adjusted to raise the temperature of the kettle body by 20±2°C and keep it, and then phosphorus oxychloride is added dropwise. At this time, the vacuum is less than -0.070Mp until the addition of phosphorus oxychloride is completed; then the catalyst metering tank is opened to allow the catalyst to enter the kettle body through the feed pipe 3. "At this time, the cold brine valve using the same pipeline should be closed", and then stirring is started for 20min and the kettle body is kept vacuum; then the mixture is kept warm and stirred for 5 hours until the temperature rises to 130°C. This process can be achieved by adjusting the amount of heat medium entering the upper heating ring 15, the amount of heat medium entering the middle heating ring 20 is kept normal, and the amount of heat medium entering the lower heating ring 23 is slightly larger. Keep warm for 30min, so that esterification is completed, and then the vacuum degree in the kettle body is slowly reduced, and the motor 1 is turned on for stirring, and the vacuum is exhausted when the temperature drops to 100°C to obtain the esterified material.

[0029] After the neutralization and water washing in the above steps, the stirring kettle "another processing equipment or the same equipment used in conjunction with the present application, that is, another distillation kettle used for the production of trioctyl phosphate" is used. First, prepare 10% soda ash solution and 10% brine, open the vacuum in the stirring kettle, turn the esterified material into the stirring kettle and start stirring, open the alkali metering valve to slowly add the soda ash solution, keep the temperature between 80-90°C, when the pH value reaches 7.0-7.5, stop the vacuum and stir for 30 minutes, let it stand for 30 minutes, separate and neutralize; before the end of neutralization, open the 10% brine metering valve to add brine in the second stirring kettle and open the vacuum, start stirring, and then slowly add the neutralized material, stop the vacuum after the material is turned over and stir for 10 minutes and then let it stand for 15 minutes, then separate the water. After the separation of water is completed, open the vacuum, gradually add the measured 10% salt water under stirring at room temperature, after adding, stop the vacuum, stir for 10 minutes, let it stand for 15 minutes, and separate the water; open the valve and start the vacuum, under stirring at room temperature, gradually add the measured pure water, after adding, stop the vacuum, stir for 10 minutes, let it stand for 15 minutes, and separate the water; after the separation of water is completed, open the vacuum, under stirring at room temperature, gradually add the measured pure water, after adding, stop the vacuum, stir for 10 minutes, let it stand for 15 minutes, and separate the water.

[0030] During the neutralization, water washing and alcohol distillation, the cooling water valve of the condenser is opened, the drain valve of the buffer tank is closed, the vacuum pump is opened to make the present invention in a vacuum state, the drain valve of the buffer tank is closed, the inlet and outlet valves 26 of the present invention are opened, the material is pumped into the present invention to start heating and heating to distill alcohol, the steam pressure is 0.05-0.5 MPa to make the material temperature reach between 120-130°C, at this time the vacuum degree should be ≤0.097 MPa, the steam valve is closed, the stirring and vacuum are stopped, and the vacuum pump buffer tank is emptied, the sampling analysis is performed, the content is ≥95%, after passing the test, the stirring is started, the steam valve is opened to add steam into the kettle using the feed pipe 3, and the gas stripping is performed to fully remove the light components, and the alcohol is distilled. End; finally, use a distillation kettle for refining. First, prepare the materials: 5% soda ash solution and 2% brine. Use vacuum to draw the materials into the distillation kettle. Open the soda ash metering tank and slowly add the measured 5% soda ash solution into the kettle. Use the upper heating ring 15, the middle heating ring 20 and the lower heating ring 23 to heat the distillation kettle to 80-85°C and neutralize and stir for 10 minutes. At this time, the temperature of the lower heating ring 23 can be controlled to be slightly higher than that of the upper heating ring. After the waste water is separated, add the measured 2% brine into the distillation kettle, stir, wash, and separate the water. After the separation of water is completed, add pure water, stir and wash until the acid value of the product is less than 0.1 mgKOH / g, separate the water, and complete the refining to obtain trioctyl phosphate.

[0031] The phosphorus oxychloride distribution pipe 6 provided in the present invention can realize the dripping of phosphorus oxychloride during processing. The upper heat medium inlet 14 of the upper heating ring sleeve 15 provided in the present invention is connected to the heating device through the upper medium connecting inlet pipe 35, and the heating device inputs heat medium into the secondary temperature chamber 32, and then the heat medium flows back to the heating device from the upper medium connecting outlet pipe 36 for heating; similarly, the middle heat medium inlet 18 of the middle heating ring sleeve 20 is connected to the heating device through the middle medium connecting inlet pipe 37, and the heating device inputs heat medium into the high temperature chamber 30, and then the heat medium flows back to the heating device from the middle medium connecting outlet pipe 38 for heating; the lower heating ring sleeve 20 is connected to the heating device through the middle medium connecting inlet pipe 37, and the upper heat medium inlet 14 of the upper heating ring sleeve 15 is connected to the heating device through the middle medium connecting inlet pipe 35, and then the upper heat medium inlet 14 of the lower heating ring sleeve 20 is connected to the heating device through the middle medium connecting inlet pipe 37, and then the upper heat medium inlet 14 of the lower heating ring sleeve 20 is connected to the heating device through the middle medium connecting inlet pipe 38, and then the lower heat medium inlet 14 of the lower heating ring sleeve 20 is connected to the heating device through the middle medium connecting inlet pipe 37, and then the upper heat medium inlet 14 of the lower heating ring sleeve 20 is connected to the heating device through the middle medium connecting inlet pipe 37, and then the upper heat medium inlet 14 of the lower heating ring sleeve 20 is connected to the heating device through the middle medium connecting inlet pipe 38, and then the lower ... The lower heat medium inlet 22 of the annulus 23 is connected to the heating device through the lower medium connecting inlet pipe 39, and the heating device inputs heat medium into the highest temperature chamber 28, and then the heat medium flows back to the heating device through the lower medium connecting outlet pipe 40 for heating; the temperature can be controlled by adjusting the amount of heat medium entering through valves arranged on the upper medium connecting inlet pipe 35, the middle medium connecting inlet pipe 37 and the lower medium connecting inlet pipe 39, or three different heating devices are arranged to heat the heat medium to the required temperature respectively to obtain the required temperature of the secondary temperature chamber 32, the high temperature chamber 30 and the highest temperature chamber 28, and the heat medium can be oil or water or other fluids.

[0032] The preferred embodiments of the present disclosure have been described in detail above, but it should be understood that after reading the above teachings of the present disclosure, those skilled in the art may make various changes or modifications within the scope of protection of the present disclosure. These equivalent forms also fall within the scope defined by the claims attached to this application.

[0033] Parts not described in detail in this disclosure are prior art.

Claims

1. A distillation kettle for producing trioctyl phosphate, comprising a kettle body, a motor (1), a stirring blade (19), a feed pipe (3), a pressure gauge (4), a vacuum tube (5), an oxygen-phosphorus distribution pipe (6), an upper heating ring sleeve (15), a middle heating ring sleeve (20), a lower heating ring sleeve (23) and an isooctyl alcohol inlet and outlet pipe (25), wherein: A motor (1) is provided at the middle of the upper end of the kettle body, and a stirring blade (19) is provided at the lower end of a rotating shaft (16) of the motor (1) which is inserted into a kettle cavity (33) of the kettle body; a feed pipe (3), a pressure gauge (4) and a vacuum tube (5) are provided around the motor (1) at the upper end of the kettle body, respectively; an oxygen and phosphorus distribution pipe (6) at the upper part of the kettle body is provided with a plurality of inner dripping pipes (7) which are embedded in the kettle cavity (33) of the kettle body; an upper heating ring sleeve (15) is provided at the middle outer edge of the kettle body, a middle heating ring sleeve (20) is provided at the lower outer edge of the kettle body, a lower heating ring sleeve (23) is wrapped around the lower end of the kettle body and the bottom of the kettle body, and the middle part of the bottom plate (29) of the kettle body is connected to an isooctyl alcohol feed and discharge pipe (25).

2. The still used during the production of trioctyl phosphate according to claim 1, characterized in that: A motor support (43) is provided at the middle of the upper end of the kettle body. A rotating shaft (16) of a motor (1) provided on the motor support (43) passes through the motor support (43) and the kettle body, and a stirring blade (19) is provided at the outer edge of the lower end of the rotating shaft (16).

3. The still used during the production of trioctyl phosphate according to claim 1, characterized in that: Valves (2) are respectively provided on the feed pipe (3) and the vacuum pipe (5).

4. The still used during the production of trioctyl phosphate according to claim 1, characterized in that: The oxygen-phosphorus distribution pipe (6) on the upper part of the kettle body is in a C-shaped structure, one end of the oxygen-phosphorus distribution pipe (6) is in a closed state, and the other end of the oxygen-phosphorus distribution pipe (6) is connected to the oxygen-phosphorus container via an oxygen-phosphorus feeding pipe (42). A plurality of tee pipes (41) are arranged at intervals on the oxygen-phosphorus distribution pipe (6) of the C-shaped structure, and the interfaces of the plurality of tee pipes (41) facing the kettle body are respectively fixedly connected to the outer ends of the inner drip pipe (7), and the outer edge of the middle part of the inner drip pipe (7) is fixedly connected to the kettle body.

5. The still used during the production of trioctyl phosphate according to claim 4, characterized in that: The oxygen and phosphorus feed pipe (42) is fixed to the upper outer edge surface of the kettle body through a plurality of fixing sleeves (34).

6. The still used during the production of trioctyl phosphate according to claim 1, characterized in that: The kettle body is divided into an upper kettle body (8) and a lower kettle body (31). An upper flange (11) is arranged at the lower end of the upper kettle body (8), and a lower flange (13) is arranged at the upper end of the lower kettle body (31). The upper flange (11) of the upper kettle body (8) is buckled on the lower flange (13) of the lower kettle body (31), and the upper flange (11) and the lower flange (13) are connected by locking screws (10). Sealing rings (12) are arranged on the opposite surfaces of the upper flange (11) and the lower flange (13), and handles (9) are respectively arranged on both sides of the middle of the upper kettle body (8).

7. The still used during the production of trioctyl phosphate according to claim 1, characterized in that: The upper end surface of the lower heating ring sleeve (23) is provided with a connecting ring plate B (46), and a raised ring (47) is provided in the middle of the bottom plate (48) of the lower heating ring sleeve (23); the middle opening of the connecting ring plate B (46) of the lower heating ring sleeve (23) is fixedly connected to the outer edge of the lower kettle body (31) near the lower end, the upper opening of the raised ring (47) is fixedly connected to the middle recessed bottom plate (29) of the lower kettle body (31), and the middle recessed bottom plate (29) of the raised ring (47) is fixedly connected to the middle recessed bottom plate (29) of the lower kettle body (31). The upper portion is provided with an installation opening (44) for an isooctyl alcohol inlet and outlet pipe (25); a maximum temperature chamber (28) is formed between the lower heating ring sleeve (23), the connecting ring plate B (46), the bottom plate (48) and the middle recessed bottom plate (29); a lower heat medium inlet opening (22) is provided at an upper portion of one side of the lower heating ring sleeve (23); a lower heat medium outlet opening (24) is provided on the bottom plate (48); the lower end of the middle heating ring sleeve (20) is fixedly connected to the lower heating ring sleeve (23); ), the inner opening of the connecting ring plate provided at the upper opening of the middle heating ring sleeve (20) is fixedly connected to the lower outer edge of the lower kettle body (31), a high temperature chamber (30) is formed between the middle heating ring sleeve (20) and the connecting ring plate, the connecting ring plate B (46) and the outer edge of the lower kettle body (31), and a middle heating medium inlet (18) and a middle heating medium outlet (21) are respectively provided at the upper and lower parts of one side of the middle heating ring sleeve (20); the lower end of the upper heating ring sleeve (15) is fixedly connected to the The upper end of the middle heating ring sleeve (20) is connected, and the inner opening of the connecting ring plate A (45) provided at the upper opening of the upper heating ring sleeve (15) is fixedly connected to the lower middle outer edge of the lower kettle body (31). A secondary temperature chamber (32) is formed between the upper heating ring sleeve (15) and the connecting ring plate, the connecting ring plate A (45) and the outer edge of the lower kettle body (31). An upper heat medium inlet (14) and an upper heat medium outlet (17) are respectively provided at the upper and lower parts of one side of the upper heating ring sleeve (15).

8. The still used during the production of trioctyl phosphate according to claim 1, characterized in that: The four sides of the lower heating ring sleeve (23) are respectively fixedly connected to the upper ends of the plurality of supporting legs (27).

9. The still used during the production of trioctyl phosphate according to claim 1, characterized in that: The isooctyl alcohol inlet and outlet pipes (25) are provided with inlet and outlet valves (26).

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