Etherification reaction device for preparing pentaerythritol triallyl ether

Abstract

The application discloses an etherification reaction device for preparing pentaerythritol triallyl ether, which comprises a reaction tank, a feeding port is arranged on the inner top of the reaction tank, a discharging port is arranged on the inner bottom of the reaction tank, the feeding port is of a sealable structure, and a control valve is arranged in the discharging port; an agitating mechanism is arranged on the reaction tank, the agitating mechanism comprises a reciprocating screw rod which is rotationally connected to the inner top of the reaction tank, the agitating mechanism comprises two stirring rods which are fixedly connected to the left and right sides of the lower end of the reciprocating screw rod, and the two stirring rods are both in L shape; and an auxiliary mechanism is arranged in cooperation with the agitating mechanism. In the process of use, the liquid at the bottom can be pumped to the top part by cooperation of the spiral conveying rod and the stirring rod, then the whole is agitated, the stratification condition is effectively broken, and in addition, the heating structure cooperates with the mixing and agitating structure, so that more uniform heating effect can be realized.

Description

Technical Field

[0001] This invention relates to the field of pentaerythritol triallyl ether preparation, and more particularly to an etherification reaction apparatus for the preparation of pentaerythritol triallyl ether. Background Technology

[0002] Pentaerythritol allyl ether is a widely used chemical intermediate, often used as a crosslinking agent to produce acrylic polymer thickeners and superabsorbent resins. It is also used in the synthesis of unsaturated polyesters, polyurethane resins, epoxy resins, UV-curable resins and other polymers to give the polymers self-drying properties. In the production process of pentaerythritol allyl ether, an etherification reaction device is required to carry out the etherification reaction of the raw materials.

[0003] However, in actual production, we found that the raw materials for traditional etherification reactions have a layering problem. Traditional reaction devices only use a stirring shaft for stirring, which makes it difficult to break the layering phenomenon, resulting in an uneven overall reaction. In addition, heating is required during the reaction, but the heating element is in a fixed state, which also makes it necessary to improve the heating uniformity. Therefore, how to promote the heating and mixing of the reaction device is a problem we need to consider. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by proposing an etherification reaction apparatus for the preparation of pentaerythritol triallyl ether. During use, the apparatus utilizes the cooperation of a screw conveyor and a stirring rod to draw the liquid at the bottom to the top, and then stirs the whole thing, effectively breaking up the stratification. In addition, the heating structure combined with the mixing and stirring structure can achieve a more uniform heating effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An etherification reaction apparatus for preparing pentaerythritol triallyl ether includes a reaction vessel with a feed inlet at the top and a discharge outlet at the bottom. The feed inlet is a sealable structure, and a control valve is installed inside the discharge outlet. A stirring mechanism includes a reciprocating screw rotatably connected to the top of the reaction vessel and stirring rods fixedly connected to the left and right sides of the lower end of the reciprocating screw, both stirring rods being L-shaped. An auxiliary mechanism, cooperating with the stirring mechanism, includes a metal cylinder fixedly connected to the bottom of the reaction vessel. A spiral conveying rod is rotatably connected to the top of the metal cylinder, the spiral conveying rod consisting of spiral blades and a rotating shaft. The upper end of the rotating shaft of the spiral conveying rod passes through the metal cylinder and is fixedly connected to the lower end of the reciprocating screw. Multiple first connecting ports are opened in the top portion of the metal cylinder, and multiple second connecting ports are opened in the bottom portion of the metal cylinder. A heating mechanism is used to uniformly heat the raw materials.

[0007] Preferably, the heating mechanism includes an induction coil embedded in the inner wall of the reaction vessel, and the metal cylinder and multiple stirring rods are all made of thermally conductive metal and cooperate with the induction coil.

[0008] Preferably, a guide telescopic rod is fixedly connected to the inner top of the reaction vessel, and a lifting plate is fixedly connected to the telescopic end of the guide telescopic rod. The threaded portion of the reciprocating screw passes through the lifting plate and is threadedly connected to the lifting plate.

[0009] Preferably, a cooling box is fixedly connected to the inner top of the reaction vessel. The cooling box is provided with a liquid storage chamber and a strip-shaped chamber. A telescopic bladder is provided between the lifting plate and the inner top of the reaction vessel. The inner top of the telescopic bladder is connected to the strip-shaped chamber through a vertical pipe. A one-way air outlet pipe is connected to the inner top of the telescopic bladder. A one-way valve is installed in both the vertical pipe and the one-way air outlet pipe.

[0010] Preferably, a first spiral temperature-conducting tube is embedded in the inner wall of the metal cylinder, a hollow ring is fixedly connected to the inner bottom of the reaction vessel, a plurality of air outlet holes are opened in the inner top of the hollow ring, the air outlet end of the spiral temperature-conducting tube is connected to the hollow ring through a connecting pipe, and the other end of the first one-way air outlet pipe is connected to the air inlet end of the first spiral temperature-conducting tube.

[0011] Preferably, the system further includes a conversion mechanism, which includes a magnetic piston slidably connected in the strip cavity. The right side of the magnetic piston is elastically connected to the right inner wall of the strip cavity via a spring. The left space of the strip cavity is connected to the inner top space of the reaction vessel via an L-shaped connecting pipe. An electromagnet is embedded in the right inner wall of the strip cavity. When the electromagnet is energized, it attracts the adjacent surfaces of the magnetic piston with opposite polarities.

[0012] Preferably, the liquid storage chamber is filled with a temperature-conducting liquid, a semiconductor refrigeration element is installed on the left side of the cooling box, the cooling end of the semiconductor refrigeration element extends into the liquid storage chamber, a second spiral temperature-conducting tube is installed in the liquid storage chamber, the air inlet end of the second spiral temperature-conducting tube extends to the outside, and the air outlet end of the second spiral temperature-conducting tube extends into the strip-shaped cavity.

[0013] Preferably, a motor is installed at the upper end of the cooling box, the output shaft of the motor extends into the cooling box and is fixedly connected to multiple disturbance rods, and the output shaft of the motor extends into the reaction vessel and is fixedly connected to the upper end of the reciprocating lead screw.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows:

[0015] 1. Equipped with a stirring rod and a screw conveyor, the bottom liquid enters the top while being stirred simultaneously. This method effectively breaks up the stratification of the reaction liquid and promotes rapid reaction.

[0016] 2. Equipped with a telescopic bladder, when the motor starts, it drives the reciprocating screw to rotate, ultimately realizing the reciprocating contraction and expansion of the telescopic bladder, and discharging high-temperature airflow from multiple air outlets. The high-temperature airflow is blown into the reaction liquid, promoting further flow and mixing of the reaction liquid, while further uniformly heating the reaction liquid to ensure the required reaction temperature.

[0017] 3. An adjustment mechanism is provided. After the reaction is completed, the low-temperature airflow is discharged from the vent and enters the reaction liquid to uniformly cool the liquid after the reaction. The stirring rod and the screw conveyor rod are in a rotating state, so the overall cooling is also very uniform. Combined with the pre-cooling structure, the cooling can be achieved relatively quickly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the etherification reaction apparatus for the preparation of pentaerythritol triallyl ether proposed in this invention;

[0019] Figure 2 for Figure 1 Enlarged view of point A;

[0020] Figure 3 for Figure 1 Enlarged view of point B;

[0021] Figure 4 for Figure 2 A diagram showing the state of a spring during compression;

[0022] Figure 5 This is an enlarged schematic diagram of a hollow ring.

[0023] In the diagram: 1. Reaction vessel, 2. Inlet, 3. Outlet, 4. Induction coil, 5. Cooling box, 6. Motor, 7. Reciprocating screw, 8. Lifting plate, 9. Guide telescopic rod, 10. Telescopic bladder, 11. Metal cylinder, 12. First connecting port, 13. Spiral conveying rod, 14. Stirring rod, 15. Hollow ring, 16. First spiral temperature-conducting pipe, 17. One-way air outlet pipe, 18. Air outlet, 19. Control valve, 20. Semiconductor refrigeration component, 21. Second spiral temperature-conducting pipe, 22. Disturbance rod, 23. Strip cavity, 24. Electromagnet, 25. Spring, 26. Magnetic piston, 27. Vertical pipe, 28. Second connecting port, 29. Connecting pipe, 30. L-shaped connecting pipe. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Reference Figures 1-5 An etherification reaction apparatus for preparing pentaerythritol triallyl ether includes a reaction vessel 1, an inlet 2 installed at the top of the inner side of the reaction vessel 1, a discharge port 3 installed at the bottom of the inner side of the reaction vessel 1, the inlet 2 being a sealable structure, and a control valve 19 installed inside the discharge port 3.

[0026] As one embodiment of the present invention, it also includes a stirring mechanism, which includes a reciprocating screw 7 rotatably connected to the top of the reaction vessel 1, and stirring rods 14 fixedly connected to the left and right sides of the lower end of the reciprocating screw 7. Both stirring rods 14 are L-shaped.

[0027] As one embodiment of the present invention, it also includes an auxiliary mechanism, which cooperates with the stirring mechanism. The auxiliary mechanism includes a metal cylinder 11 fixedly connected to the bottom of the reaction vessel 1. A spiral conveying rod 13 is rotatably connected to the top of the inner part of the metal cylinder 11. The spiral conveying rod 13 is composed of a spiral conveying blade and a rotating shaft. The upper end of the rotating shaft of the spiral conveying rod 13 passes through the metal cylinder 11 and is fixedly connected to the lower end of the reciprocating screw 7. A plurality of first communication ports 12 are opened in the top part of the inner part of the metal cylinder 11, and a plurality of second communication ports 28 are opened in the bottom part of the inner part of the metal cylinder 11.

[0028] In one embodiment of the present invention, a heating mechanism is also included. The heating mechanism is used to uniformly heat the raw materials. The heating mechanism includes an induction coil 4 embedded in the inner wall of the reaction vessel 1. The metal cylinder 11 and multiple stirring rods 14 are all made of heat-conducting metal and cooperate with the induction coil 4. A guide telescopic rod 9 is fixedly connected to the inner top of the reaction vessel 1. A lifting plate 8 is fixedly connected to the telescopic end of the guide telescopic rod 9. The threaded portion of the reciprocating screw 7 passes through the lifting plate 8 and is threadedly connected to the lifting plate 8. A cooling box 5 is fixedly connected to the inner top of the reaction vessel 1. The cooling box 5 is provided with a liquid storage chamber and a strip-shaped chamber 23. A telescopic bladder 10 is provided between the lifting plate 8 and the inner top of the reaction vessel 1. The inner top of the telescopic bladder 10... The part is connected to the strip cavity 23 through the vertical pipe 27. The top of the inner part of the telescopic bladder 10 is connected to the one-way air outlet pipe 17. One-way valves are installed in both the vertical pipe 27 and the one-way air outlet pipe 17. The flow direction of the one-way valve in the vertical pipe 27 is from top to bottom. The flow direction of the one-way valve in the one-way air outlet pipe 17 is that the telescopic bladder 10 enters the first spiral temperature-conducting pipe 16 in one direction. The first spiral temperature-conducting pipe 16 is embedded in the inner wall of the metal cylinder 11. A hollow ring 15 is fixedly connected to the bottom of the inner part of the reaction vessel 1. Multiple air outlet holes 18 are opened in the top of the inner part of the hollow ring 15. The air outlet end of the first spiral temperature-conducting pipe 16 is connected to the hollow ring 15 through the connecting pipe 29. The other end of the one-way air outlet pipe 17 is connected to the air inlet end of the first spiral temperature-conducting pipe 16.

[0029] In one embodiment of the present invention, a conversion mechanism is also included. The conversion mechanism includes a magnetic piston 26 slidably connected within the strip-shaped cavity 23. The right side of the magnetic piston 26 is elastically connected to the right inner wall of the strip-shaped cavity 23 via a spring 25. The left space of the strip-shaped cavity 23 is connected to the inner top space of the reaction vessel 1 via an L-shaped connecting pipe 30. An electromagnet 24 is embedded in the right inner wall of the strip-shaped cavity 23. When the electromagnet 24 is energized, it attracts the adjacent surfaces of the magnetic piston 26 with opposite polarities. The liquid storage cavity is filled with a heat-conducting liquid, and a semiconductor cooling component is installed on the left side of the cooling box 5. 20. The semiconductor cooling device 20 is composed of a semiconductor cooling chip and a heat dissipation fan. The cooling end of the semiconductor cooling device 20 extends into the liquid storage chamber. A second spiral temperature conducting tube 21 is installed in the liquid storage chamber. The air inlet end of the second spiral temperature conducting tube 21 extends to the outside. The air outlet end of the second spiral temperature conducting tube 21 extends into the strip cavity 23. A motor 6 is installed at the upper end of the cooling box 5. The output shaft of the motor 6 extends into the cooling box 5 and is fixedly connected to multiple disturbance rods 22. The output shaft of the motor 6 extends into the reaction vessel 1 and is fixedly connected to the upper end of the reciprocating screw 7.

[0030] In this invention, during use, the material to be reacted is first fed into the feed inlet 2, then the feed inlet 2 is closed, and the induction coil 4, motor 6, semiconductor cooling element 20, and electromagnet 24 are activated. After the electromagnet 24 is activated, the magnetic piston 26 moves to the right, forming a... Figure 4 shape;

[0031] The start of motor 6 will drive the reciprocating screw 7 to rotate. The rotation of the reciprocating screw 7 will cause the stirring rod 14 to rotate, thus achieving the stirring function. The rotation of the reciprocating screw 7 will also cause the screw conveyor 13 to rotate. The rotation of the screw conveyor 13 will inject the liquid at the bottom to the top of the liquid surface. Combined with the rotation of the stirring rod 14, it can effectively break the layering of the reaction liquid and promote the rapid reaction of the reaction liquid.

[0032] After the induction coil 4 is activated, the metal cylinder 11 and multiple stirring rods 14 will heat up. The stirring rods 14 are in a rotating state, which can make the liquid heat up more evenly. The liquid will also heat up when passing through the metal cylinder 11, further promoting the uniformity of the overall heating. It should be noted that the rotation of the reciprocating screw 7 will cause the lifting plate 8 to move up and down, causing the telescopic bladder 10 to stretch and contract repeatedly. Since the L-shaped connecting pipe 30 and the vertical pipe 27 are connected at this time, the one-way valve in the vertical pipe 27 and the one-way valve in the one-way air outlet pipe 17 will generate gas flow in the top space of the reaction tank 1, the telescopic bladder 10, and the first spiral heat-conducting pipe 16. This gas flow will eventually be discharged from multiple air outlets 18. This gas flow will be rapidly heated at the first spiral heat-conducting pipe 16 and finally sprayed out as a high-temperature gas flow, which will be blown into the reaction liquid, promoting the further flow and mixing of the reaction liquid while further uniformly heating the reaction liquid.

[0033] During the above process, the semiconductor cooling device 20 cools the liquid in the cooling chamber 5, and the motor 6 drives multiple agitator rods 22 to rotate, achieving uniform cooling of the liquid and ensuring that the liquid is in a uniform low-temperature state. After the subsequent reaction is completed, the operator opens the feed port 2 and closes the induction coil 4 and electromagnet 24. Under the elastic action of the spring 25, the magnetic piston 26 returns to its original position. Figure 3 At this position, the reciprocating contraction and expansion of the telescopic bladder 10 will generate gas flow from the outside, the second spiral heat-conducting tube 21, the telescopic bladder 10, and the first spiral heat-conducting tube 16. This gas flow will eventually be discharged from multiple air outlets 18. When this gas flow passes through the second spiral heat-conducting tube 21, it will be cooled down and finally enter the reaction liquid in the form of a low-temperature gas flow, which will uniformly cool the liquid after the reaction. In addition, the stirring rod 14 and the spiral conveying rod 13 mentioned above are also in a rotating state, so the overall cooling is also extremely uniform.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An etherification reaction apparatus for the preparation of pentaerythritol triallyl ether, characterized in that, include: The reaction vessel (1) has an inlet (2) installed at the top inside and a outlet (3) installed at the bottom inside. The inlet (2) is a sealable structure and a control valve (19) is installed inside the outlet (3). The stirring mechanism includes a reciprocating screw (7) rotatably connected to the top of the reaction vessel (1), and the stirring mechanism includes stirring rods (14) fixedly connected to the left and right sides of the lower end of the reciprocating screw (7). Both stirring rods (14) are L-shaped. An auxiliary mechanism is provided, which works in conjunction with a stirring mechanism. The auxiliary mechanism includes a metal cylinder (11) fixedly connected to the bottom of the reaction vessel (1). A spiral conveying rod (13) is rotatably connected to the top of the metal cylinder (11). The spiral conveying rod (13) is composed of a spiral conveying blade and a rotating shaft. The upper end of the rotating shaft of the spiral conveying rod (13) passes through the metal cylinder (11) and is fixedly connected to the lower end of a reciprocating screw (7). The top of the metal cylinder (11) is provided with multiple first connecting ports (12), and the bottom of the metal cylinder (11) is provided with multiple second connecting ports (28). A heating mechanism is used to uniformly heat the raw materials; The heating mechanism includes an induction coil (4) embedded in the inner wall of the reaction vessel (1). The metal cylinder (11) and multiple stirring rods (14) are all made of thermally conductive metal and are in conjunction with the induction coil (4). The inner top of the reaction vessel (1) is fixedly connected to a guide telescopic rod (9), and the telescopic end of the guide telescopic rod (9) is fixedly connected to a lifting plate (8). The threaded part of the reciprocating screw (7) passes through the lifting plate (8) and is threadedly connected to the lifting plate (8). A cooling box (5) is fixedly connected to the top of the reaction tank (1). The cooling box (5) is provided with a liquid storage chamber and a strip-shaped chamber (23). A telescopic bladder (10) is provided between the lifting plate (8) and the top of the reaction tank (1). The top of the telescopic bladder (10) is connected to the strip-shaped chamber (23) through a vertical pipe (27). The top of the telescopic bladder (10) is connected to a one-way air outlet pipe (17). A one-way valve is installed in both the vertical pipe (27) and the one-way air outlet pipe (17). The inner wall of the metal cylinder (11) is fitted with a first spiral temperature-conducting tube (16), and a hollow ring (15) is fixedly connected to the bottom of the reaction vessel (1). The top of the hollow ring (15) is provided with multiple air outlets (18). The air outlet end of the first spiral temperature-conducting tube (16) is connected to the hollow ring (15) through a connecting pipe (29), and the other end of the one-way air outlet pipe (17) is connected to the air inlet end of the first spiral temperature-conducting tube (16).

2. The etherification reaction apparatus for preparing pentaerythritol triallyl ether according to claim 1, characterized in that, It also includes a conversion mechanism, which includes a magnetic piston (26) slidably connected in the strip cavity (23). The right side of the magnetic piston (26) is elastically connected to the right inner wall of the strip cavity (23) through a spring (25). The left space of the strip cavity (23) is connected to the inner top space of the reaction vessel (1) through an L-shaped connecting pipe (30). An electromagnet (24) is embedded on the right inner wall of the strip cavity (23). When the electromagnet (24) is energized, it attracts the adjacent surfaces of the magnetic piston (26) with opposite polarities.

3. The etherification reaction apparatus for preparing pentaerythritol triallyl ether according to claim 2, characterized in that, The liquid storage chamber is filled with a temperature-conducting liquid. A semiconductor cooling element (20) is installed on the left side of the cooling box (5). The cooling end of the semiconductor cooling element (20) extends into the liquid storage chamber. A second spiral temperature-conducting tube (21) is installed in the liquid storage chamber. The air inlet end of the second spiral temperature-conducting tube (21) extends to the outside, and the air outlet end of the second spiral temperature-conducting tube (21) extends into the strip cavity (23).

4. The etherification reaction apparatus for preparing pentaerythritol triallyl ether according to claim 3, characterized in that, The upper end of the cooling box (5) is equipped with a motor (6), the output shaft of the motor (6) extends into the cooling box (5) and is fixedly connected with multiple disturbance rods (22), the output shaft of the motor (6) extends into the reaction vessel (1) and is fixedly connected to the upper end of the reciprocating screw (7).

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