Bubbling reaction device

Abstract

The utility model relates to a bubbling reaction device which comprises a kettle body, a stirring shaft and a driving assembly, the lower end of the stirring shaft extends into the kettle body, and a gas channel is arranged in the stirring shaft; the driving assembly is arranged outside the kettle body and is in transmission connection with the upper end of the stirring shaft to drive the stirring shaft to rotate around the axis of the stirring shaft, the filtering type stirrer is connected to the stirring shaft in the kettle body and comprises a hollow framework layer and at least one filtering layer, the hollow framework layer is communicated with the gas channel, and the filtering layer is communicated with the stirring shaft. The filtering layers are formed outside the framework layer, when the multiple filtering layers are arranged, the multiple filtering layers are arranged inside and outside, and the hole diameter of the filtering holes in the filtering layer located on the outer layer is smaller than that of the filtering holes in the filtering layer located on the inner layer. According to the utility model, the influence of a gas distributor on a stirring flow field is avoided, bubbles can reach a micron level, the contact specific area of gas-liquid reaction is increased, the gas-liquid separation is slowed down, the gas content of a reaction system is increased, and the input power is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-liquid reaction, in particular to a bubbling reaction device. Background Art

[0002] The bubbling reaction device is a gas-liquid reaction device with liquid phase as continuous phase and gas phase as dispersed phase. It is mainly used for medium-speed, slow-speed reactions and reactions with large heat release in which the liquid phase participates in the reaction.

[0003] In the prior art, bubbling reaction is usually carried out in two ways. One is to install a self-priming agitator in the reactor, such as Figure 3 As shown, the other is a loop reactor, such as Figure 4 As shown, both methods can increase the gas content in the liquid phase, strengthen gas-liquid mass transfer, and promote the reaction. However, the self-priming capacity of the self-priming agitator is limited by the thickness of the liquid layer, the rotation speed, and the paddle diameter. The power input is relatively large, and the bubble diameter is general, which restricts the specific surface area of ​​the gas-liquid two-phase contact; and when the loop reactor is involved in the solid phase, the solid particle content is limited, and the particles enter the circulation pump, causing greater damage to the pump cavity, mechanical seal, and Venturi nozzle. When the liquid phase material is liquid-liquid heterogeneous, the mixing effect is poor. Summary of the invention

[0004] The utility model aims to provide a bubbling reaction device.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A bubbling reaction device comprises a kettle body, a stirring shaft, and a driving assembly, wherein the lower end of the stirring shaft extends into the kettle body, and a gas channel is arranged inside the stirring shaft; the driving assembly is arranged outside the kettle body and is transmission-connected to the upper end of the stirring shaft to drive it to rotate around its own axis; the device also comprises a filtering agitator, which is connected to the stirring shaft in the kettle body, and the filtering agitator comprises a hollow skeleton layer and at least one filter layer, wherein the hollow skeleton layer is connected to the gas channel, and the filter layer is formed outside the skeleton layer; when the filter layer is provided with multiple layers, the multiple filter layers are provided inside and outside, and the filter pore size of the filter layer located in the outer layer is smaller than the filter pore size of the filter layer located in the inner layer.

[0007] Preferably, in the above technical solution, the filtering agitator further comprises a protective layer, the protective layer is arranged outside the filtering layer, and the pore size of the holes on the protective layer is larger than the pore size of the filtering layer inside it.

[0008] Further preferably, the thickness of the protective layer is greater than the thickness of the filter layer inside it.

[0009] Further preferably, the aperture size of the holes in the protective layer is 10 - 500 microns. Even more preferably, the aperture size of the holes in the protective layer is 100 - 200 microns.

[0010] Further preferably, the material of the protective layer is determined according to the corrosiveness of the medium and can be a metal material or a non-metal material.

[0011] Preferably in the above technical solution, the aperture size of the holes in the skeleton layer is larger than the pore size of the filter layer.

[0012] Preferably in the above technical solution, the thickness of the skeleton layer is greater than the thickness of the filter layer.

[0013] Preferably in the above technical solution, the aperture size of the holes in the skeleton layer is 100 - 1000 microns. Even more preferably, the aperture size of the holes in the skeleton layer is 300 - 1000 microns.

[0014] Preferably in the above technical solution, the skeleton layer is made of wire mesh or sintered metal powder.

[0015] Preferably in the above technical solution, the filter layer includes a first filter layer and a second filter layer. The second filter layer is disposed outside the first filter layer. The pore size of the first filter layer is 10 - 500 microns, and the pore size of the second filter layer is 0.5 - 100 microns. Even more preferably, the aperture size of the holes in the skeleton layer 40 is 300 - 1000 microns, the pore size of the first filter layer is 100 - 200 microns, and the pore size of the second filter layer is 0.5 - 50 microns.

[0016] Preferably in the above technical solution, when multiple filter layers are provided, the thickness of the filter layer located on the outer layer is less than the thickness of the filter layer located on the inner layer.

[0017] Preferably in the above technical solution, the material of the filter layer is determined according to the corrosiveness of the medium and can be a metal material or a non-metal material.

[0018] Preferably in the above technical solution, the filter agitator is plate-shaped or column-shaped, and the plate-shaped or column-shaped filter agitator is perpendicular to the stirring shaft.

[0019] Preferably in the above technical solution, the filter agitator is connected to the lower end of the stirring shaft.

[0020] Preferably in the above technical solution, the number of the filter agitators is one or more.

[0021] Preferably, in the above technical solution, the device further includes a paddle agitator, which includes a plurality of blades connected to the stirring shaft.

[0022] Further preferably, the number of the blades is 2 - 8.

[0023] Preferably, in the above technical solution, the device further includes a frame, which is arranged on the top of the kettle body, and the driving assembly is arranged on the frame.

[0024] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0025] 1. The conventional gas distributor is omitted, which can avoid the influence of the gas distributor on the stirring flow field, especially for the solid-containing system;

[0026] 2. The gas passing through the filter agitator can make the bubbles very fine, reaching the micron level, greatly increasing the contact specific area of the gas-liquid reaction. The tiny bubbles can slow down the gas-liquid separation and increase the gas holdup of the reaction system. The pore precision of the filter agitator and the gas source flow rate can adjust the gas holdup and gas specific surface area of the reaction system;

[0027] 3. The filter agitator shears the gas into bubbles, without relying on the high-speed shearing force of the agitator, and the input power is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Attached Figure 1 is a schematic structural diagram of the device in this embodiment;

[0029] Attached Figure 2 is a cross-sectional schematic diagram of the filter agitator in this embodiment;

[0030] Attached Figure 3 is a schematic structural diagram of a reaction device with a self-priming agitator in the prior art;

[0031] Attached Figure 4 is a schematic structural diagram of a loop reactor in the prior art.

[0032] In the above drawings:

[0033] 1. Kettle body; 10. Frame; 11. Baffle;

[0034] 2. Stirring shaft; 20. Gas channel; 21. Air inlet;

[0035] 3. Driving assembly;

[0036] 4. Filter agitator; 40. Skeleton layer; 410. First filter layer; 411. Second filter layer; 42. Protective layer;

[0037] 5. Paddle agitator;

[0038] 6. Reaction device with self - suction agitator;

[0039] 7. Loop reactor. Detailed implementation manners

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] As Figure 1 shown, a bubble reaction device includes a kettle body 1, a stirring shaft 2, a driving assembly 3, a filter - type agitator 4, and a paddle agitator 5. The following will describe each component in detail.

[0043] A frame 10 is provided at the top of the kettle body 1, and the frame 10 is used to set the driving assembly 3. A baffle 11 is arranged inside the kettle body 1, and the function of the baffle 11 is to improve the stirring intensity, enhance the mixing effect, and eliminate the vortex.

[0044] The stirring shaft 2 is vertically arranged, its lower end extends into the kettle body 1, and its upper end exposes out of the kettle body 1. Moreover, the stirring shaft 2 is in sealed cooperation with the kettle body 1, but the sealed cooperation does not affect the rotation of the stirring shaft 2. Preferably, the stirring shaft 2 extends into the kettle body 1 from the center, that is, the stirring shaft 2 coincides with the central line of the kettle body 1. A gas channel 20 is arranged inside the stirring shaft 2, or rather, the inside of the stirring shaft 2 is hollow, the gas channel 20 extends along the length direction of the stirring shaft 2, and an air inlet 21 is formed at the upper end of the stirring shaft 2, and gas can enter the gas channel 20 inside the stirring shaft 2 from this air inlet 21.

[0045] The driving assembly 3 is arranged on the frame 10 outside the kettle body 1 and is in transmission connection with the upper end of the stirring shaft 2 to drive it to rotate around its own axis. The driving assembly 3 can be selected, for example, a motor, etc.

[0046] The filter stirrer 4 is connected to the stirring shaft 2 inside the kettle body 1. The filter stirrer 4 can be plate-shaped or columnar. The plate-shaped or columnar filter stirrer 4 is perpendicular to the stirring shaft 2. In the figure, the filter stirrer 4 is connected to the lower end of the stirring shaft 2. The number of the filter stirrers 4 can be one or more. For example, when two filter stirrers 4 are provided, the two filter stirrers 4 are distributed at an interval of 180°. For example, when three filter stirrers 4 are provided, the three filter stirrers 4 are spaced 120° apart, and multiple filter stirrers 4 are evenly distributed. When the stirring shaft 2 rotates, the filter stirrer 4 itself can be used as a stirring paddle for stirring.

[0047] In this embodiment: The filter stirrer 4 includes a hollow skeleton layer 40, at least one filter layer, and a protective layer 42. Among them, the hollow skeleton layer 40 is communicated with the gas channel 20, and the filter layer is formed outside the skeleton layer 40. When multiple filter layers are provided, the multiple filter layers are arranged inside and outside to form a layered structure from the inside to the outside.

[0048] The skeleton layer 40 is made of wire mesh or sintered metal powder. The aperture of the holes on the skeleton layer 40 is the largest, larger than the aperture of the filter holes of the filter layer and the aperture of the holes on the protective layer 42. At the same time, the thickness of the skeleton layer 40 is also the thickest, with a thickness greater than the thickness of the filter layer and the thickness of the protective layer, so as to ensure the overall strength of the stirrer.

[0049] The filter layer includes a first filter layer 410 and a second filter layer 411. The first filter layer 410 is arranged outside the skeleton layer 40, and the second filter layer 411 is arranged outside the first filter layer 410. The materials of the first filter layer 410 and the second filter layer 411 are determined according to the corrosiveness of the medium, and can be metal materials or non-metal materials.

[0050] The aperture of the filter holes of the second filter layer 411 located on the outer layer is smaller than the aperture of the filter holes of the first filter layer 410 located on the inner layer. At the same time, the thickness of the second filter layer 411 located on the outer layer is smaller than the thickness of the first filter layer 410 located on the inner layer. The first filter layer 410 is used to transition from the coarse pore structure of the skeleton layer 40 to the fine pores of the second filter layer 411. The second filter layer 411 has the smallest aperture and is used to generate micro-bubbles.

[0051] The material of the protective layer 42 is determined according to the corrosiveness of the medium, and can be metal materials or non-metal materials.

[0052] The aperture of the holes on the protective layer 42 is larger than the aperture of the filter holes of the second filter layer 411 inside it. At the same time, the thickness of the protective layer 42 is greater than the thickness of the second filter layer 411 inside it, so as to protect the second filter layer 411 from being damaged.

[0053] In this embodiment: the pore diameter of the holes on the skeleton layer 40 is 300 - 1000 microns, the pore diameter of the filter holes of the first filter layer 410 is 100 - 200 microns, the pore diameter of the filter holes of the second filter layer 411 is 0.5 - 50 microns, and the pore diameter of the holes on the protective layer 42 is 100 - 200 microns.

[0054] The paddle agitator 5 includes a plurality of paddle blades. The number of paddle blades is 3 - 8. The paddle blades are connected to the stirring shaft 2. In this embodiment, the paddle agitator 5 is located above the filter agitator 4 and uses 5 paddle blades that are inclined relative to the horizontal plane.

[0055] In the preparation of methyl propionate by the ethylene method, this embodiment was used for experiments. The gas mass with the same gas specific surface area decreased by more than 90%, that is, the gas circulation volume could be reduced, and the actual circulation was reduced by 40%, ensuring that there was enough gas participating in the reaction; at the same time, due to the refinement of bubbles, the mass transfer was strengthened, and the reaction rate was also increased to a certain extent.

[0056] When comparing the energy consumption of this embodiment with the conventional "one gas distribution pipe + disk turbine paddle", this embodiment saves more than 50% of the electric energy.

[0057] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A bubbling reaction device, comprising a kettle, a stirring shaft, and a driving assembly, wherein the lower end of the stirring shaft extends into the kettle, and a gas channel is arranged inside the stirring shaft; the driving assembly is arranged outside the kettle and is transmission-connected to the upper end of the stirring shaft to drive it to rotate around its own axis, characterized in that: The device also includes a filtering agitator, which is connected to the stirring shaft in the kettle body. The filtering agitator includes a hollow skeleton layer and at least one filter layer. The hollow skeleton layer is connected to the gas channel, and the filter layer is formed on the outside of the skeleton layer. When the filter layer is arranged in multiple layers, the multiple filter layers are arranged inside and outside, and the filter pore size of the filter layer located in the outer layer is smaller than the filter pore size of the filter layer located in the inner layer.

2. The bubbling reaction device according to claim 1, characterized in that: The filtering agitator further comprises a protective layer, which is arranged outside the filtering layer, and the aperture of the holes on the protective layer is larger than the aperture of the filter holes in the filtering layer inside the protective layer.

3. The bubbling reaction device according to claim 2, characterized in that: The thickness of the protective layer is greater than the thickness of the filter layer inside it; and / or The pore size of the pores on the protective layer is 10-500 microns.

4. The bubbling reaction device according to claim 1, characterized in that: The aperture of the pores on the skeleton layer is larger than the aperture of the filter pores in the filter layer.

5. The bubbling reaction device according to claim 1, characterized in that: The thickness of the skeleton layer is greater than the thickness of the filter layer; and / or The pore size of the pores in the skeleton layer is 100-1000 microns; and / or The skeleton layer is formed by sintering wire mesh or metal powder.

6. The bubbling reaction device according to claim 1, characterized in that: The filter layer comprises a first filter layer and a second filter layer. The second filter layer is arranged outside the first filter layer. The filter pore size of the first filter layer is 10-500 microns, and the filter pore size of the second filter layer is 0.5-100 microns.

7. The bubbling reaction device according to claim 1 or 6, characterized in that: When the filter layer is provided in multiple layers, the thickness of the filter layer located in the outer layer is smaller than the thickness of the filter layer located in the inner layer.

8. The bubbling reaction device according to claim 1, characterized in that: The filtering agitator is plate-shaped or column-shaped, and the filtering agitator is perpendicular to the agitator shaft; The filtering agitator is connected to the lower end of the agitator shaft; The number of the filtering agitators is one or more.

9. The bubbling reaction device according to claim 1, characterized in that: The device further comprises a paddle stirrer, wherein the paddle stirrer comprises a plurality of paddle blades, and the paddle blades are connected to the stirring shaft; The number of the blades is 2-8.

10. The bubbling reaction device according to claim 1, characterized in that: The device also includes a frame, which is arranged on the top of the kettle body, and the driving assembly is arranged on the frame.

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