Reaction device for preparing polyoxyethylene ether

Abstract

The utility model discloses a reaction device for preparing polyoxyethylene ether, which relates to the technical field of reaction devices and comprises a reaction kettle, a kettle cover fixedly connected above the reaction kettle through bolts, a fixed plate fixedly connected at the lower end of the right side of the reaction kettle, an infusion pump fixedly mounted on the upper surface of the fixed plate, and a spray ring fixedly connected above the inside of the reaction kettle. The bottom of the reaction kettle is fixedly connected with a discharging pipe, the output end of the infusion pump is fixedly connected with a liquid inlet pipe, the tail end of the liquid inlet pipe penetrates through the right side wall of the reaction kettle and is communicated with the interior of the spraying ring, the input end of the infusion pump is fixedly connected with an infusion pipe, and the tail end of the infusion pipe is communicated with the interior of the discharging pipe; a stirring assembly is arranged in the reaction kettle. The device has the advantages that due to the design of the spraying ring and the spraying head, unreacted oxyethylene can be in full contact with sprayed hydroxide fog drops, so that the reaction opportunity is increased, and the reaction completeness is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to reaction device technical field, concretely relates to a kind of reaction devices of preparation polyoxyethylene ether. BACKGROUND

[0002] Polyoxyethylene ether, also known as polyethylene oxide or polyethylene oxide. It is a crystalline, thermoplastic water-soluble polymer. It is not only a new type of water-soluble resin, but also a non-ionic surfactant. The preparation of polyoxyethylene ether is to introduce ethylene oxide gas into the reactor. Under the action of the catalyst, the ethylene oxide monomer undergoes ring-opening and polymerization reaction initiated by hydroxide (such as water or ethylene glycol). The monomer continuously connects to form a long-chain polymer. The molecular weight of PEG is controlled by adjusting the reaction conditions, catalyst dosage, initiator dosage, etc. The polymerization reaction is stopped by adding a terminating agent or adjusting the reaction conditions. Finally, the PEG solution obtained after filtration, removal of catalyst and other impurities is polyoxyethylene ether.

[0003] In the traditional reaction method, due to the difficulty of gas dissolving in liquid, part of the ethylene oxide that has not reacted will move to the upper part of the reactor, and part of the ethylene oxide cannot effectively participate in the reaction, which will lead to incomplete reaction, and the molecular weight and yield of the produced PEG may be lower than expected. Unreacted ethylene oxide gas will accumulate at the top of the reactor, which may form an explosive mixture at high concentrations, posing a safety hazard. To solve the above problems, a reaction device for preparing polyoxyethylene ether is proposed. SUMMARY

[0004] To solve the above technical problems, a reaction device for preparing polyoxyethylene ether is provided, which solves the above problems of current gas difficulty in dissolving in liquid, part of the ethylene oxide that has not reacted will move to the upper part of the reactor, part of the ethylene oxide cannot effectively participate in the reaction, which will lead to incomplete reaction, and the molecular weight and yield of the produced PEG may be lower than expected. Unreacted ethylene oxide gas will accumulate at the top of the reactor, which may form an explosive mixture at high concentrations, posing a safety hazard.

[0005] In order to achieve the above object, the technical scheme of the utility model is: a reaction device for preparing polyoxyethylene ether, including reaction kettle, the top of reaction kettle is fixedly connected with kettle cover through bolt, the lower end of right side of reaction kettle is fixedly connected with fixed plate, the upper surface of fixed plate is fixedly installed with liquid pump, the inside upper portion of reaction kettle is fixedly connected with spray ring, the top of spray ring is fixedly installed with several inclined spray heads, the bottom of reaction kettle is fixedly connected with discharge pipe, the output end of liquid pump is fixedly connected with liquid inlet pipe, the tail end of liquid inlet pipe penetrates the right side wall of reaction kettle and is communicated with the inside of spray ring, the input end of liquid pump is fixedly connected with liquid suction pipe, the tail end of liquid suction pipe is communicated with the inside of discharge pipe, the inside of reaction kettle is provided with stirring assembly.

[0006] Preferably, the stirring assembly comprises a stirring motor, the output end of the stirring motor penetrates the top of the kettle cover and is fixedly connected with a stirring shaft in the inside of the reaction kettle, and the bottom of the stirring shaft is fixed with three groups of stirring blades.

[0007] Preferably, the outside surface of the stirring shaft is fixedly connected with two fixed discs above the stirring blades, at least three rotating rods are fixedly connected between the two fixed discs, and the outside surface of the rotating rods is fixedly connected with a plurality of spoiler rods.

[0008] Preferably, the top left side of the kettle cover is fixedly connected with a feeding pipe, and the top right side of the kettle cover is fixedly connected with a catalyst pipe.

[0009] Preferably, the rear side of the reaction kettle is fixedly connected with at least two pipe clamps, the inside of the pipe clamps is clamped with an air inlet pipe, the tail end of the air inlet pipe penetrates the bottom of the reaction kettle and is fixedly connected with a one-way diaphragm in the inside of the reaction kettle.

[0010] Preferably, the bottom of the discharge pipe is fixedly connected with a valve for discharging.

[0011] Preferably, the bottom of the reaction kettle is fixedly connected with at least four supporting legs, and the bottom of the four supporting legs is fixedly connected with a non-slip pad.

[0012] Compared with the prior art, the utility model has the advantages that: the liquid pump is arranged, the inside of the reaction kettle is connected with the spray ring through the liquid inlet pipe, the misty spray head on the top of the spray ring sprays out, thereby reacting with the oxygen ethylene which has not reacted in time, the design of the spray ring and the spray head can fully contact the unreacted oxygen ethylene with the sprayed hydroxide droplets, thereby increasing the reaction opportunity, improving the reaction completeness, reducing the raw material waste, the misty sprayed hydroxide can be more uniformly distributed in the reaction kettle, and a more uniform reaction system is formed with the oxygen ethylene, which helps to reduce the local concentration difference in the reaction process and improve the uniformity and consistency of the reaction. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 It is a top view of the utility model;

[0015] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0016] Figure 4 It is the stirring component in the utility model.

[0017] The numbers in the figure are:

[0018] 1. Reactor; 2. Reactor cover; 3. Discharge pipe; 4. Fixed plate; 5. Liquid extraction pump; 6. Liquid inlet pipe; 7. Spray ring; 8. Spray head; 9. Stirring assembly; 901. Stirring motor; 902. Stirring shaft; 903. Fixed plate; 904. Rotating rod; 905. Turbine rod; 906. Stirring blade; 10. Liquid extraction pipe; 11. Feeding pipe; 12. Catalyst tube; 13. Pipe clamp; 14. Inlet pipe; 15. One-way diaphragm; 16. Valve; 17. Support leg; 18. Anti-slip pad. DETAILED DESCRIPTION

[0019] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0020] Reference Figure 1-4 As shown, a reaction device for preparing polyoxyethylene ether includes a reactor 1, a reactor cover 2 is fixedly connected to the top of the reactor 1 by bolts, a fixed plate 4 is fixedly connected to the lower right end of the reactor 1, a liquid pump 5 is fixedly installed on the upper surface of the fixed plate 4, a spray ring 7 is fixedly connected to the top of the reactor 1, and a plurality of inclined spray heads 8 are fixedly installed above the spray ring 7, a discharge pipe 3 is fixedly connected to the bottom of the reactor 1, the output end of the liquid pump 5 is fixedly connected to the liquid inlet pipe 6, the end of the liquid inlet pipe 6 passes through the right side wall of the reactor 1 and is connected to the inside of the spray ring 7, the input end of the liquid pump 5 is fixedly connected to the liquid extraction pipe 10, and the end of the liquid extraction pipe 10 is connected to the inside of the discharge pipe 3, and a stirring component 9 is provided inside the reactor 1, which greatly increases the contact area between hydroxide and ethylene oxide, thereby improving the reaction efficiency and reaction degree. The design of the spray ring 7 and the inclined spray head 8 enables the hydroxide to be evenly sprayed in the reactor 1 in the form of mist. The mist spraying also helps to reduce local accumulation of reactants and avoid uneven reaction.

[0021] Specifically, the stirring assembly 9 comprises a stirring motor 901, an output end of the stirring motor 901 penetrates through the top of the cover 2 and is fixedly connected with the inside of the reaction kettle 1 to have a stirring shaft 902, the bottom of the stirring shaft 902 is fixedly connected with three groups of stirring blades 906, the stirring motor 901 drives the stirring shaft 902 and the stirring blades 906 and the spoiler rods 905 on the stirring shaft 902 to rotate, realizing omnidirectional stirring of the reactants, which not only promotes uniform mixing of the reactants, but also speeds up the reaction rate and ensures sufficient contact and reaction between the reactants.

[0022] Further, the outer surface of the stirring shaft 902 is fixedly connected with two fixed discs 903 above the stirring blades 906, at least three rotating rods 904 are fixedly connected between the two fixed discs 903, the outer surface of the rotating rods 904 is fixedly connected with a plurality of spoiler rods 905, and the presence of the spoiler rods 905 further enhances the stirring effect, reduces the dead angle of the reactants in the reaction kettle 1, and improves the reaction efficiency.

[0023] Further, the top left side of the cover 2 is fixedly connected with a feeding pipe 11, and the top right side of the cover 2 is fixedly connected with a catalyst pipe 12, the feeding pipe 11 and the catalyst pipe 12 facilitate the control of the addition amount and addition time of the hydroxide and the catalyst, respectively.

[0024] Specifically, the rear side of the reaction kettle 1 is fixedly connected with at least two pipe clamps 13, the pipe clamps 13 are connected with an air inlet pipe 14, the end of the air inlet pipe 14 penetrates through the bottom of the reaction kettle 1 and is fixedly connected with a one-way diaphragm 15 inside the reaction kettle 1, the air inlet pipe 14 is connected with an external oxygen ethylene storage device to provide stable oxygen ethylene supply for the reaction. The one-way diaphragm 15 effectively prevents the backflow of the hydroxide in the reaction kettle 1 into the air inlet pipe 14, ensuring the stability and safety of the reaction system. At the same time, the one-way diaphragm 15 also has a certain filtering effect, which can reduce the impurities entering the reaction kettle 1.

[0025] Preferably, the lower side of the discharge pipe 3 is fixedly connected with a valve 16 for discharging materials, and the precise control of the valve 16 can ensure that the discharge pipe 3 is opened or closed at the appropriate time, avoiding the influence of the premature or late discharge of the product on the reaction effect. In addition, the valve 16 also has a certain sealing property, which can prevent the leakage of gas or liquid during the reaction.

[0026] Specifically, the bottom of the reaction kettle 1 is fixedly connected with at least four supporting legs 17, and the bottom of the four supporting legs 17 is fixedly connected with anti-skid pads 18, the arrangement of the anti-skid pads 18 further enhances the friction between the supporting legs 17 and the ground, preventing the reaction kettle 1 from sliding or toppling due to external forces during operation.

[0027] Working principle: the device in use, first, the intake pipe 14 and external oxygen ethylene storage device is connected, then through the feeding pipe 11 to the reactor 1 injection of hydroxide, catalyst pipe 12 to the reactor 1 injection of catalyst, then close the feeding pipe 11 and catalyst pipe 12, open the external oxygen ethylene storage device control valve, oxygen ethylene through the intake pipe 14 into the reactor 1 inside, under the action of one-way diaphragm 15, hydroxide will not leak through the intake pipe 14, then the liquid pump 5 through the liquid pump 10 will be inside the reactor 1 hydroxide through the liquid inlet pipe 6 into the spray ring 7, through the spray ring 7 above the spray head 8 mist spray, so as to react with the oxygen ethylene above, increase the degree of reaction, at the same time, the stirring motor 901 drive stirring shaft 902 rotation and then drive fixed disc 903, spoiler 905 and stirring blade 906 rotation on the stirring of hydroxide, accelerate the reaction efficiency.

[0028] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements fall within the scope of the claimed present application. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A reaction device for preparing polyoxyethylene ether, characterized in that: The invention comprises a reactor (1), wherein a reactor cover (2) is fixedly connected to the top of the reactor (1) by bolts, a fixing plate (4) is fixedly connected to the lower right end of the reactor (1), a liquid pump (5) is fixedly installed on the upper surface of the fixing plate (4), a spray ring (7) is fixedly connected to the top of the reactor (1), a plurality of inclined spray heads (8) are fixedly installed above the spray ring (7), a discharge pipe (3) is fixedly connected to the bottom of the reactor (1), an output end of the liquid pump (5) is fixedly connected to a liquid inlet pipe (6), the end of the liquid inlet pipe (6) passes through the right side wall of the reactor (1) and is communicated with the inside of the spray ring (7), an input end of the liquid pump (5) is fixedly connected to a liquid extraction pipe (10), the end of the liquid extraction pipe (10) is communicated with the inside of the discharge pipe (3), and a stirring assembly (9) is provided inside the reactor (1).

2. A reaction device for preparing polyoxyethylene ether according to claim 1, characterized in that: The stirring assembly (9) comprises a stirring motor (901), the output end of which passes through the top of the kettle cover (2) and is fixedly connected to a stirring shaft (902) inside the reactor (1), and three groups of stirring blades (906) are fixed to the bottom of the stirring shaft (902).

3. A reaction device for preparing polyoxyethylene ether according to claim 2, characterized in that: Two fixed disks (903) are fixedly connected to the outer surface of the stirring shaft (902) and above the stirring blade (906); at least three rotating rods (904) are fixedly connected between the two fixed disks (903); and several interfering flow rods (905) are fixedly connected to the outer surface of the rotating rod (904).

4. A reaction device for preparing polyoxyethylene ether according to claim 1, characterized in that: A feeding pipe (11) is fixedly connected to the left side of the top of the kettle cover (2), and a catalyst tube (12) is fixedly connected to the right side of the top of the kettle cover (2).

5. A reaction device for preparing polyoxyethylene ether according to claim 1, characterized in that: At least two pipe clamps (13) are fixedly connected to the rear side of the reactor (1), an air inlet pipe (14) is clamped inside the pipe clamp (13), and the end of the air inlet pipe (14) passes through the bottom of the reactor (1) and is fixedly connected to a one-way diaphragm (15) inside the reactor (1).

6. A reaction device for preparing polyoxyethylene ether according to claim 1, characterized in that: A valve (16) for discharging is fixedly connected to the lower side of the discharge pipe (3).

7. A reaction device for preparing polyoxyethylene ether according to claim 1, characterized in that: At least four supporting legs (17) are fixedly connected to the bottom of the reactor (1), and anti-slip pads (18) are fixedly connected to the bottoms of the four supporting legs (17).

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