Double-speed stirring vertical high-viscosity polymerization kettle

Abstract

A heating coil is arranged on the lower portion of an inner cavity of a kettle body, a reducing part extending upwards is arranged in the center of the top of the kettle body, a kettle body top cover covers a flange of the reducing part, a hollow shaft extending downwards is arranged in the center of the kettle body top cover, and a rotary body is connected to the lower portion of the hollow shaft. Radial stirring supporting rods and outer side stirring blades are symmetrically arranged on the periphery of the rotary body, the upper end of the hollow shaft is connected with the output end of an outer side stirring speed reducer, and an input shaft of the outer side stirring speed reducer is driven by an outer side stirring motor; a central stirring shaft is arranged along the axis of the hollow shaft, a central stirring blade is arranged at the lower end of the central stirring shaft and located in the heating coil, the upper end of the central stirring shaft is connected with the output end of a central stirring speed reducer, and an input shaft of the central stirring speed reducer is driven by a central stirring motor. According to the polymerization kettle, materials in the central area and materials close to the kettle wall can be respectively stirred and updated, and the pole climbing phenomenon during production of ultrahigh-viscosity varieties is inhibited.

Description

Technical Field

[0001] The utility model relates to a polymerization reactor, in particular to a double-speed stirring vertical high-viscosity polymerization kettle, belonging to the technical field of chemical equipment. Background Art

[0002] During the working process of the polymerization reactor, stirring is required. The stirring mechanism is used to accelerate the mixing of materials and the devolatilization of oligomers, promote the high-temperature polymerization reaction under vacuum conditions, and realize the increase in the viscosity of the melt. The vertical polymerization reactor usually adopts a frame stirrer, and the top of the rotating shaft of the frame stirrer is driven by driving devices such as motors and speed reducers.

[0003] The traditional polymerization reactor has the following problems: 1. At the end of the viscosity increase stage, when it is necessary to strengthen the liquid surface renewal, the frame stirring paddle is restricted by power and other factors and cannot operate at the upper limit of the rotation speed; 2. When producing high-intrinsic viscosity varieties, the melt is easily adhered to the paddle blades, resulting in difficult discharging or degradation.

[0004] The Chinese utility model patent with the publication number of CN 205761127U discloses a polymerization reactor with high stirring efficiency, including a polymerization reactor body, which is composed of a lower reactor body and an upper reactor cover. The lower reactor body and the upper reactor cover are sealed and installed, and it also includes a stirring mechanism installed in the polymerization reactor body; the stirring mechanism includes a motor, a stirring shaft, stirring cross bars, and stirring blades. The stirring shaft is connected to the motor; the stirring cross bars include a first stirring cross bar and a second stirring cross bar with the same structure. The first and second stirring cross bars are both vertically fixed on the stirring shaft and are parallel to each other; the cross-sectional shape of the stirring blade is a W shape, and the stirring blade includes a connecting part and a blade body. The blade body is composed of a first bending part, a second bending part, and a stirring vertical bar. The first bending part is arranged on one side of the connecting part, one end of the second bending part is connected to the first bending part, and the other end is connected to the stirring vertical bar.

[0005] Although the stirring efficiency of this polymerization kettle is improved, the entire stirring mechanism rotates at the same angular velocity. When producing high-viscosity polymerization products, the products are easily adhered to the stirring shaft and difficult to fall off, that is, the "climbing rod" phenomenon occurs. Summary of the Utility Model

[0006] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and the title of the specification of this application, to avoid obscuring the purpose of this part, the abstract of the specification, and the title of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the utility model.

[0007] In view of the above and / or problems existing in the prior art, the present utility model is proposed.

[0008] The object of the present utility model is to overcome the problems existing in the prior art and provide a double-speed stirring vertical high-viscosity polymerization kettle, which can respectively stir and update the materials in the central area and the materials near the kettle wall, and inhibit the "climbing rod" phenomenon during the production of ultra-high viscosity varieties.

[0009] To solve the above technical problems, a double-speed stirring vertical high-viscosity polymerization kettle of the present utility model includes a kettle body. A heating coil is provided at the lower part of the inner cavity of the kettle body. A reduced-diameter part extending upward is provided at the center of the top of the kettle body. A kettle body top cover covers the flange of the reduced-diameter part. A hollow shaft extending downward is provided at the center of the kettle body top cover. A rotating body is connected to the lower part of the hollow shaft. Radial stirring support rods are symmetrically arranged on the outer periphery of the rotating body. Outer stirring blades are fixedly connected to the radial stirring support rods. The upper end of the hollow shaft is connected to the output end of an outer stirring speed reducer, and the input shaft of the outer stirring speed reducer is driven by an outer stirring motor.

[0010] A central stirring shaft is arranged along the axis of the hollow shaft. A central stirring blade is provided at the lower end of the central stirring shaft. The central stirring blade is located in the heating coil. The upper end of the central stirring shaft is connected to the output end of a central stirring speed reducer, and the input shaft of the central stirring speed reducer is driven by a central stirring motor.

[0011] As an improvement of the present utility model, the outer stirring blade is of a frame structure and the outer edge is close to the inner peripheral wall of the kettle body.

[0012] As a further improvement of the present utility model, the lower part of the outer stirring blade is located on the outer periphery of the heating coil.

[0013] As a further improvement of the present utility model, shaft sealing mechanisms are respectively provided at the upper ends of the hollow shaft and the central stirring shaft.

[0014] As a further improvement of the present utility model, shaft seal flushing systems are respectively provided for the shaft sealing mechanisms of the hollow shaft and the central stirring shaft.

[0015] As a further improvement of the present utility model, the rotation directions of the hollow shaft and the central stirring shaft are the same or opposite.

[0016] As a further improvement of the present utility model, a rotary sealing device is provided at the part where the lower end of the central stirring shaft passes through the central hole of the rotating body.

[0017] As a further improvement of the present utility model, the central stirring shaft is a high-speed shaft and the hollow shaft is a low-speed shaft.

[0018] As a further improvement of the present utility model, a heating jacket is provided on the outer periphery of the kettle body.

[0019] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. It can effectively reduce power consumption, accelerate the polycondensation reaction rate, expand the product viscosity range, reduce side reactions and degradation, and improve product quality;

[0020] 2. Adopting the design of coaxial double rotation speeds, the central and peripheral stirring mechanisms can rotate in opposite directions to inhibit the "climbing rod" phenomenon during the production of high-viscosity polymerization products;

[0021] 3. The central and peripheral parts respectively adopt independent drive systems to achieve differential operation and set different drive powers, saving power consumption;

[0022] 4. Effectively control the temperature rise generated during stirring, force the liquid surface to be updated, improve the reaction efficiency, shorten the production batch time, and increase the revenue. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. The drawings are only for reference and description, and are not used to limit the present utility model. Among them:

[0024] Figure 1 It is the front view of the double-speed stirring vertical high-viscosity polymerization kettle of the present utility model;

[0025] In the figure: 1. Kettle body; 1a. Kettle body top cover;

[0026] Central stirring system: 2a. Central stirring motor; 2b. Central stirring speed reducer; 2c. Central stirring shaft; 2d. Central stirring paddle; 2e. Central stirring mechanical seal; 2f. Central shaft seal flushing system; 2g. Rotary seal device;

[0027] Outer stirring system: 3a. Outer stirring motor; 3b. Outer stirring speed reducer; 3c. Hollow shaft; 3d. Rotating body; 3e. Radial stirring support rod; 3f. Outer stirring paddle; 3g. Outer stirring mechanical seal; 3h. Outer shaft seal flushing system;

[0028] 4. Heating coil; 4a. Coil heat medium inlet; 4b. Coil heat medium outlet. Detailed Embodiments

[0029] In the following description of the present utility model, the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating that the device must have a specific orientation.

[0030] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model.

[0032] As Figure 1 shown, the double-speed stirring vertical high-viscosity polymerization kettle of the present utility model includes a kettle body 1. A heating jacket is provided on the outer periphery of the kettle body 1. A heating coil 4 is provided at the lower part of the inner cavity of the kettle body 1. The heating coil 4 is coaxial with the kettle body 1 and winds around several times along the height direction of the kettle body. One end is connected with a coil heat medium inlet 4a, and the other end is connected with a coil heat medium outlet 4b. The coil heat medium inlet 4a and the coil heat medium outlet 4b extend out from the bottom wall of the kettle body 1.

[0033] A reduced-diameter part extending upward is provided at the center of the top of the kettle body 1. A kettle body top cover 1a is covered on the flange of the reduced-diameter part. A hollow shaft 3c extending downward is provided at the center of the kettle body top cover 1a. A rotating body 3d is connected to the lower part of the hollow shaft 3c. Radial stirring support rods 3e are symmetrically provided on the outer periphery of the rotating body 3d. Outer stirring blades 3f are fixedly connected to the radial stirring support rods 3e. The upper end of the hollow shaft 3c is connected to the output end of an outer stirring speed reducer 3b. The input shaft of the outer stirring speed reducer 3b is driven by an outer stirring motor 3a. The outer stirring blades 3f are of a frame structure, with the lower part located on the outer periphery of the heating coil 4 and the outer edge close to the inner peripheral wall of the kettle body, forcing the material at the kettle wall to be updated and simultaneously realizing the liquid surface update. The outer stirring blades 3f have a large resistance and a slow rotation speed. An outer stirring motor 3a with a relatively large power is configured. The outer stirring speed reducer 3b is of a special design. The upper end of the hollow shaft 3c passes through the center of the output end of the outer stirring speed reducer 3b.

[0034] The part where the hollow shaft 3c passes through the kettle body top cover 1a is sealed by an outer stirring mechanical seal 3g. An outer shaft seal flushing system 3h is provided on the outside. The medium outlet of the outer shaft seal flushing system 3h is communicated with the medium inlet of the outer stirring mechanical seal 3g through a supply pipe. The medium outlet of the outer stirring mechanical seal 3g is communicated with the medium inlet of the outer shaft seal flushing system 3h through a return pipe. In this way, while introducing ethylene glycol into the outer stirring mechanical seal 3g through the outer shaft seal flushing system 3h to export heat, the outer stirring mechanical seal 3g is flushed.

[0035] A central stirring shaft 2c is provided along the axis of the hollow shaft 3c. The lower end of the central stirring shaft 2c is close to the center of the bottom of the kettle body and is provided with a central stirring blade 2d. The central stirring blade 2d is located in the heating coil 4. The upper end of the central stirring shaft 2c is connected to the output end of the central stirring speed reducer 2b, and the input shaft of the central stirring speed reducer 2b is driven by the central stirring motor 2a. The central stirring blade 2d has low resistance and high speed, and a central stirring motor 2a with a relatively small power is configured to realize the renewal of the central materials in the reaction kettle.

[0036] A rotary sealing device 2g is provided at the part where the lower end of the central stirring shaft 2c passes through the central hole of the rotating body 3d. A central stirring mechanical seal 2e is provided at the part where the upper end of the central stirring shaft 2c passes through the hollow shaft 3c. An outer central shaft seal flushing system 2f is provided, which is communicated with the medium inlet and outlet of the central stirring mechanical seal 2e through a pipeline. While introducing ethylene glycol into the central stirring mechanical seal 2e to conduct heat, the central stirring mechanical seal 2e is flushed.

[0037] Both the central stirring motor 2a and the outer stirring motor 3a are frequency-controlled and can adjust the speed according to the actual production to achieve the balance of product viscosity increase and temperature rise. Usually, at the initial stage of polymerization, the central stirring blade 2d and the outer stirring blade 3f adopt a relatively high speed; when the product viscosity increases, the speed is reduced.

[0038] In the later stage of polymerization, high-viscosity materials are likely to adhere to the stirring mechanism. At this time, the rotating directions of the hollow shaft 3c and the central stirring shaft 2c can be opposite to each other to inhibit the "climbing rod" phenomenon during the production of ultra-high-viscosity varieties. This technical solution can be used in polymerization reaction kettles such as PET / PBAT / PBS / PETG / TPEE.

[0039] The above is only a preferred and feasible embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. It does not limit the patent protection scope of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present invention, the present invention can also have other implementation manners. The present invention will also have various changes and improvements. Any technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope required by the present invention. The protection scope required by the present invention is defined by the appended claims and their equivalents. The technical features not described in the present invention can be realized by or adopted from the prior art, and will not be elaborated here.

Claims

1. A double-speed stirring vertical high-viscosity polymerization kettle, comprising a kettle body, wherein a heating coil is arranged at the lower part of the inner cavity of the kettle body, and it is characterized in that, At the center of the top of the kettle body, there is a reduced-diameter part extending upward. A kettle body top cover is covered on the flange of the reduced-diameter part. At the center of the kettle body top cover, there is a hollow shaft extending downward. A rotating body is connected to the lower part of the hollow shaft. Radial stirring support rods are symmetrically arranged on the outer periphery of the rotating body. Outer stirring blades are fixedly connected to the radial stirring support rods. The upper end of the hollow shaft is connected to the output end of an outer stirring speed reducer. The input shaft of the outer stirring speed reducer is driven by an outer stirring motor. A central stirring shaft is arranged along the axis of the hollow shaft. A central stirring blade is arranged at the lower end of the central stirring shaft. The central stirring blade is located in the heating coil. The upper end of the central stirring shaft is connected to the output end of a central stirring speed reducer. The input shaft of the central stirring speed reducer is driven by a central stirring motor.

2. The double-speed stirring vertical high-viscosity polymerization kettle according to claim 1, characterized in that: The outer stirring blades are of a frame structure and the outer edge is close to the inner peripheral wall of the kettle body.

3. The double-speed stirring vertical high-viscosity polymerization kettle according to claim 2, wherein: The lower part of the outer stirring blades is located on the outer periphery of the heating coil.

4. The double-speed stirring vertical high-viscosity polymerization kettle according to claim 1, wherein: Shaft sealing mechanisms are respectively arranged at the upper ends of the hollow shaft and the central stirring shaft.

5. The double-speed stirring vertical high-viscosity polymerization kettle according to claim 4, characterized in that: The shaft sealing mechanisms of the hollow shaft and the central stirring shaft are respectively equipped with shaft seal flushing systems.

6. The double-speed stirring vertical high-viscosity polymerization kettle according to claim 1, characterized in that: The rotating directions of the hollow shaft and the central stirring shaft are the same or opposite.

7. The double-speed stirring vertical high-viscosity polymerization kettle according to claim 1, characterized in that: A rotary sealing device is arranged at the part where the lower end of the central stirring shaft passes through the central hole of the rotating body.

8. The double-speed stirring vertical high-viscosity polymerization kettle according to claim 1, characterized in that: The central stirring shaft is a high-speed shaft and the hollow shaft is a low-speed shaft.

9. The double-speed stirring vertical high-viscosity polymerization kettle according to any one of claims 1 to 8, characterized in that: A heating jacket is arranged on the outer periphery of the kettle body.

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