Multi-section multi-tube reactor for photocatalytic reaction

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a multi-section multi-tube reactor for photocatalytic reaction, which comprises a gas-liquid mixing module, a reactor and a junction station which are sequentially communicated from bottom to top, the gas-liquid mixing module comprises a first pipe, a gas inlet and a liquid inlet are formed in the side face of the first pipe, and the gas inlet is formed below the liquid inlet; the reactor comprises a shell, a plurality of reaction tubes arranged in the shell, and an ultraviolet lamp tube arranged in the shell and surrounded by the plurality of reaction tubes; the confluence device is provided with gas-liquid confluence inlets and gas-liquid confluence outlets, and the number of the gas-liquid confluence inlets corresponds to that of the reaction tubes; and the first tube, the reaction tube, the gas-liquid confluence inlet and the gas-liquid confluence outlet are sequentially communicated. The multi-section multi-tube reactor for the photocatalytic reaction has the advantages of wide application range, simple structure, easiness in maintenance and the like.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and particularly relates to a multi-stage multi-tube reactor for photocatalytic reaction. Background Art

[0002] Generally speaking, the reaction devices used in industry are mainly divided into two categories, namely continuous reaction devices and batch reaction devices. In the actual production process, among them, the batch reaction equipment is particularly obvious in the reaction kettle. A large amount of raw materials and catalysts need to be added to the reaction equipment at one time. Such a feeding method is very difficult to ensure the mixing effect of the reaction raw materials and catalysts. If the reaction time is too short, the reaction is incomplete, resulting in low raw material conversion rate and reduced output. If the reaction time is too long, the reaction is excessive, resulting in the generation of a large amount of by-products, affecting the product quality. For exothermic reactions, heat needs to be transferred in time to ensure the conversion effect. However, local overheating still occurs, posing certain potential safety hazards.

[0003] The problem to be solved by the present application: How to provide a continuous reactor that can be applied to photocatalytic reactions. Summary of the Invention

[0004] The purpose of the present application is to provide a multi-stage multi-tube reactor. A continuous multi-tube reactor is designed. Flange connections are used between each section of the tube reactor, and each reaction tube is connected to the fixed plate by a quick plug, which is convenient for the installation, maintenance, and replacement of the reaction tube.

[0005] To achieve the above purpose, the present application discloses a multi-stage multi-tube reactor for photocatalytic reaction, including a gas-liquid mixing module, a reactor, and a confluence device that are sequentially connected from bottom to top;

[0006] The gas-liquid mixing module includes a first tube. A gas inlet and a liquid inlet are provided on the side of the first tube, and the gas inlet is arranged below the liquid inlet;

[0007] The reactor includes a housing, a plurality of reaction tubes arranged inside the housing, and ultraviolet lamps arranged inside the housing and surrounded by the plurality of reaction tubes;

[0008] The confluence device is provided with a gas-liquid confluence inlet and a gas-liquid confluence outlet, and the number of the gas-liquid confluence inlets corresponds to the number of the reaction tubes;

[0009] The first tube, the reaction tubes, the gas-liquid confluence inlets, and the gas-liquid confluence outlets are sequentially connected.

[0010] Preferably, inside the housing, a cavity is provided outside the reaction tubes and the ultraviolet lamps;

[0011] The housing is provided with a heat exchange medium inlet and a heat exchange medium outlet, and the heat exchange medium inlet, the cavity, the heat exchange medium outlet, and an externally provided heat exchanger are in circular communication.

[0012] Preferably, the heat exchange medium inlet is arranged below the heat exchange medium outlet.

[0013] Preferably, the reaction tube is made of glass, fiber or polymer with a light transmittance of not less than 50%.

[0014] Preferably, the number of the reactors is multiple, and the multiple reactors are connected by flanges and the reaction tubes of the multiple reactors are in communication with each other.

[0015] Preferably, a fixing plate is arranged between the reactors, and the ultraviolet lamp tube is connected to the fixing plate by bolts and fixed inside the reactor;

[0016] The fixing plate is provided with a plurality of plugs that are hollow and penetrate through the fixing plate itself, and the reaction tubes in the multiple reactors are in communication with each other through the plugs.

[0017] Preferably, the reaction tube is a straight tube, a bent tube or a spiral tube.

[0018] Preferably, the gas-liquid mixing module is provided with a pressure gauge, and the pressure gauge is used to detect the internal air pressure of the first tube.

[0019] The beneficial effects of the present application are as follows: The multi-stage multi-tube reactor of the present application has the advantages of wide application range, simple structure, easy maintenance, etc., and can effectively improve the gas-liquid mixing and reaction effects. The specific manifestations are as follows:

[0020] The device is assembled by combining multiple reactors. If a certain reactor or a certain reaction tube fails, the faulty reactor or reaction tube can be removed or replaced separately, and its repair time is short and the cost is low, so as to minimize the production loss and repair cost caused by equipment failure.

[0021] The multi-stage multi-tube reactor has a simple structure, is convenient and fast to install and maintain, mostly uses standard parts, helps the process production, ensures the quality of the reactor equipment, and saves the production and manufacturing cost. Brief Description of the Drawings

[0022] Figure 1 It is a cross-sectional view of the multi-stage multi-tube reactor for photocatalytic reaction in Example 1;

[0023] Figure 2 It is a schematic diagram of the gas-liquid mixing module in Example 1;

[0024] Figure 3 It is a schematic diagram of the current collector in Example 1. Detailed Description of the Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1

[0027] Refer to Figures 1-3 , a multi-stage and multi-tube reactor for photocatalytic reaction, comprising a gas-liquid mixing module 1, a reactor 2, and a confluence device 3 that are sequentially connected and conducted from bottom to top;

[0028] The gas-liquid mixing module 1 includes a first tube 4, and a gas inlet 5 and a liquid inlet 6 are provided on the side surface of the first tube 4, and the gas inlet 5 is arranged below the liquid inlet 6;

[0029] The reactor 2 includes a housing 7, a plurality of reaction tubes 8 arranged inside the housing 7, and an ultraviolet lamp tube 9 arranged inside the housing 7 and surrounded by the plurality of reaction tubes 8;

[0030] The confluence device 3 is provided with a gas-liquid confluence inlet 10 and a gas-liquid confluence outlet 11, and the number of the gas-liquid confluence inlets 10 corresponds to the number of the reaction tubes 8;

[0031] The first tube 4, the reaction tubes 8, the gas-liquid confluence inlets 10, and the gas-liquid confluence outlets 11 are sequentially connected and conducted.

[0032] In the actual use process, it specifically includes the following steps:

[0033] Step 1: The operator passes the gas into the first tube 4 through the gas inlet 5, and passes the liquid into the first tube 4 through the liquid inlet 6. Since the gas inlet 5 is arranged below the liquid inlet 6, as the gas is continuously passed in, the liquid is driven to flow upward together until it enters the reaction tubes 8;

[0034] Step 2: Turn on the ultraviolet lamp tube 9 arranged inside the housing 7 and surrounded by the plurality of reaction tubes 8, and the gas and the liquid react under the photocatalysis of ultraviolet light. Of course, it should be noted that the reactor 2 of the present application is applicable to a multi-stage and multi-tube reactor 2 that can react under the photocatalysis of ultraviolet light; the gas and the liquid need to meet the condition that they can react under the photocatalysis of ultraviolet light, and not all gases and liquids in a broad sense can react in the present reactor 2;

[0035] Step 3: The product after the reaction is pushed to the gas-liquid confluence inlet 10 and enters the confluence device 3 while the reactants are continuously introduced through the gas inlet 5 and the liquid inlet 6, and then continues to move to the gas-liquid confluence outlet 11.

[0036] Furthermore, in consideration that some gas-liquid reactions not only need to proceed under photocatalytic conditions but also have sensitive temperature requirements, a cavity 12 is provided outside the reaction tube 8 and the ultraviolet lamp tube 9 inside the housing 7 of the present application;

[0037] The housing 7 is provided with a heat exchange medium inlet 13 and a heat exchange medium outlet 14, and the heat exchange medium inlet 13, the cavity 12, the heat exchange medium outlet 14, and an externally provided heat exchanger are in circular communication;

[0038] During actual use, the operator can replace the temperature and type of the heat exchange medium according to actual needs. When the gas-liquid reaction is an endothermic reaction, the operator can raise the temperature of the heat exchange medium to the temperature required for the reaction to ensure the smooth progress of the reaction; when the gas-liquid reaction is an exothermic reaction, the operator can lower the temperature of the heat exchange medium to the temperature required for the reaction to ensure the smooth progress of the reaction;

[0039] As described above, the operator can replace the type of the heat exchange medium according to actual needs. The heat exchange medium only needs to be able to satisfy the circular communication between the heat exchange medium inlet 13, the cavity 12, the heat exchange medium outlet 14, and the externally provided heat exchanger, that is, the heat exchange medium needs to be a fluid that can flow.

[0040] As a further preference of the present application, in order to make the heat absorption during the reaction more uniform, the heat exchange medium inlet 13 of the present application is arranged below the heat exchange medium outlet 14, so that the reaction tube 8 between the heat exchange medium inlet 13 and the heat exchange medium outlet 14 can uniformly exchange heat with the heat exchange medium.

[0041] As a relatively conventional design in the art, the reaction tube 8 is made of glass, fiber, or polymer with a light transmittance of not less than 50%.

[0042] Further preferably, in order to improve the working efficiency of the multi-stage multi-tube reactor for photocatalytic reaction, the number of the reactors 2 in the present application is multiple, and the multiple reactors 2 are connected by flanges 15 and the reaction tubes 8 of the multiple reactors 2 are in communication with each other; furthermore, a fixing plate 16 is arranged between the reactors 2, and the ultraviolet lamp tube 9 is connected to the fixing plate 16 by bolts and fixed inside the reactor 2;

[0043] The fixing plate 16 is provided with a plurality of plugs 17 that are hollow and penetrate through the fixing plate 16 itself, and the reaction tubes 8 in the multiple reactors 2 are in communication with each other through the plugs 17.

[0044] Meanwhile, during actual use, the reaction tube 8 can be a straight tube, a bent tube or a spiral tube. When the reaction tube 8 is a bent tube or a spiral tube, the gas-liquid flow path will be extended. Therefore, the bent tube or the spiral tube is more suitable for gas-liquid reactions with longer required reaction times.

[0045] As a further preference of the present application, since gas is required to push the liquid forward in the gas-liquid mixing module 1 of the present application, the pressure inside the gas-liquid mixing module 1 is crucial. In this regard, a pressure gauge 18 is provided in the gas-liquid mixing module 1 of the present application. The pressure gauge 18 is used to detect the air pressure inside the first tube 4. The operator can observe the air pressure inside the first tube 4 through the pressure gauge 18 to prevent the occurrence of liquid backflow.

Claims

1. A multi-stage multi-tube reactor for photocatalytic reaction, characterized in that, It includes a gas-liquid mixing module, a reactor, and a manifold that are sequentially conducted from bottom to top; The gas-liquid mixing module includes a first pipe, and a gas inlet and a liquid inlet are provided on the side of the first pipe, and the gas inlet is arranged below the liquid inlet; The reactor includes a housing, a plurality of reaction pipes arranged inside the housing, and ultraviolet lamps arranged inside the housing and surrounded by the plurality of reaction pipes; The manifold is provided with a gas-liquid confluence inlet and a gas-liquid confluence outlet, and the number of the gas-liquid confluence inlets corresponds to the number of the reaction pipes; The first pipe, the reaction pipes, the gas-liquid confluence inlet, and the gas-liquid confluence outlet are sequentially conducted.

2. The multi-stage multi-tube reactor for photocatalytic reaction according to claim 1, wherein Inside the housing, a cavity is provided outside the reaction pipes and the ultraviolet lamps; The housing is provided with a heat exchange medium inlet and a heat exchange medium outlet, and the heat exchange medium inlet, the cavity, the heat exchange medium outlet, and an externally provided heat exchanger are circulated and conducted; 3. The multi-stage multi-tubular reactor for photocatalytic reaction according to claim 2, wherein The heat exchange medium inlet is arranged below the heat exchange medium outlet.

4. The multi-stage multi-tubular reactor for photocatalytic reaction according to claim 1, characterized in that, The reaction pipes are made of glass, fiber, or polymer with a light transmittance of not less than 50%; 5. The multi-stage multi-tube reactor for photocatalytic reaction according to claim 2, wherein The number of the reactors is multiple, and the multiple reactors are connected by flanges and the reaction pipes of the multiple reactors are mutually conducted; 6. The multi-stage multi-tubular reactor for photocatalytic reaction according to claim 5, characterized in that, A fixing plate is arranged between the reactors, and the ultraviolet lamps are connected to the fixing plate by bolts and fixed inside the reactors; The fixing plate is provided with a plurality of plugs that are hollow and penetrate through the fixing plate itself, and the reaction pipes in the multiple reactors are mutually conducted through the plugs; 7. The multi-stage multi-tube reactor for photocatalytic reaction according to claim 1, wherein The reaction pipes are straight pipes, bent pipes, or spiral pipes.

8. The multi-stage multi-tubular reactor for photocatalytic reaction according to claim 1, wherein The gas-liquid mixing module is provided with a pressure gauge, and the pressure gauge is used to detect the internal air pressure of the first pipe.

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