CN215823028U - Multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide - Google Patents

Abstract

The utility model belongs to the technical field of hydrogen peroxide preparation, and particularly relates to a multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide. The micro-fluidic chip reactor is embedded on the fixture mechanism and fixed on the second clamping groove. The micro-fluidic chip comprises four sections of micro-fluidic channels which are sequentially communicated and respectively comprise a pre-mixing micro-channel, a first reaction micro-channel, an effluent liquid secondary mixing channel and a second reaction micro-channel. The hydrogen peroxide prepared by the utility model can realize continuous production of low-concentration hydrogen peroxide on a safe and non-explosive platform, meets the application requirements of the terminal market, can select different liquid outlet holes to extract hydrogen peroxide according to actual conditions, improves the flexibility and usability of operation, and has good technical characteristics.

Description

Multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide

Technical Field

The utility model belongs to the technical field of hydrogen peroxide preparation, and particularly relates to a multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide.

Background

The hydrogen peroxide is commonly known as hydrogen peroxide, is colorless and transparent liquid in appearance, and can be used for wound disinfection, environmental disinfection, food disinfection and the like. As a common oxidant, the only product of hydrogen peroxide in the reaction process is water, which is known as a green and clean chemical product and has been widely applied to the industries of chemical synthesis, papermaking, printing and dyeing and the like. With the continuous development of economy and society, the demand of hydrogen peroxide is on an increasing trend in China and even internationally.

The preparation of hydrogen peroxide is generally carried out by adopting an anthraquinone method in industry, and the hydrogen peroxide produced by the anthraquinone method accounts for 95 percent and 99 percent of the global and domestic yield respectively. The anthraquinone process adopts indirect processes of sequential hydrogenation and oxidation, and has the defects of high energy consumption, high cost and high pollution in the processes of production, product separation and purification. Therefore, the industry and academia are always seeking a green synthesis method capable of replacing the anthraquinone method. The direct catalytic synthesis method of hydrogen and oxygen is a potential industrial production method of hydrogen peroxide, and has the advantages of low pollution, high atom utilization rate, simple and convenient operation and the like. In addition, different from the anthraquinone method which is only suitable for producing high-concentration hydrogen peroxide on a large scale, the direct synthesis method of hydrogen peroxide can be used for synthesizing hydrogen peroxide products with different concentrations according to requirements (research progress of palladium-based catalyst for hydrogen peroxide direct synthesis by hydrogen peroxide, Zhang Meijia, etc., Beijing chemical engineering college, volume 72, No. 1 of the chemical academy 2021). However, the method is limited by technical factors, and industrial production and application cannot be realized so far.

Due to the fact that the traditional reactor is low in integration and automation degree and serious in resource waste, the problems of poor selectivity, poor reproducibility, potential safety hazards and the like exist, under the background, a micro-reactor, particularly a micro-fluidic chip reactor, is developed rapidly and widely applied in the last 20 years. The micro-fluidic chip reactor takes the micro-channel as a reaction place, so that materials are quickly mixed and react under the limited micron scale, and the micro-fluidic chip reactor has unique advantages. The microfluidic chip reactor has the advantages of high heat transfer, no amplification effect, high safety performance and the like, so that the microfluidic chip reactor has more and more attention in the field of chemical industry. The hydrogen peroxide direct catalytic synthesis is considered as the most promising alternative method of the anthraquinone method, however, the method still has a distance to realize industrialization. The main challenges are: firstly, explosion (4% -74%) of hydrogen and oxygen can occur in a large proportion range; second, side reactions (including reaction product water, hydrogen peroxide hydrogenation, hydrogen peroxide decomposition) are more favorable thermodynamically, resulting in low hydrogen peroxide selectivity. The hydrogen peroxide is directly synthesized by the hydrogen and the oxygen through the micro-fluidic technology by applying the micro-fluidic chip reactor, so that not only can the safe production of the hydrogen peroxide be realized, but also the continuous reaction can be realized, thereby providing a safe and continuously-produced reaction platform for synthesizing the hydrogen peroxide, and having good application prospect.

According to statistics, in the terminal market, the proportion of the low-concentration hydrogen peroxide (less than 1%) is more than 60%, so that the hydrogen peroxide produced by the anthraquinone method can be used only by transportation and dilution, and the safety problem and the cost are greatly increased. The micro-fluidic chip reactor can continuously synthesize low-concentration hydrogen peroxide, thereby meeting the market demand. The method for directly catalyzing and synthesizing hydrogen peroxide by hydrogen and oxygen has high atom utilization rate, is a technology which is green in production and accords with the national sustainable development strategy, and is a synthesis method with great prospect compared with the traditional technology. Compared with the traditional hydrogen peroxide preparation method, the method has the advantages that:

(1) the micro-channel with the micron scale cannot explode and is clean in the production reaction process, and the safety performance is high;

(2) visualization is carried out in the reaction process, and the whole reaction process is known more effectively and in real time by observing with a microscope, a high-speed camera and the like;

(3) the continuous reaction can be carried out, the concentration of the prepared hydrogen peroxide meets the requirement of the terminal market (0.7-1%), the hydrogen peroxide concentration does not need to be diluted, and the method can be directly used for chemical synthesis technologies such as subsequent coupling reaction and the like;

(4) the multiple micro-fluidic chips can be subjected to superposition (series-parallel connection) reaction, so that the space utilization rate is greatly improved, the yield is high, and the production efficiency is high;

(5) the reaction can be carried out at normal temperature and normal pressure, the conditions for the production environment are looser, the investment cost is low, and the return rate is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems and provides a multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide, which mainly solves the technical problems that the production process is easy to explode, the utilization rate of oxygen and hydrogen is low, continuous reaction cannot be realized, the working efficiency is low and the like in the prior art.

In order to achieve the purpose, the technical scheme of the utility model is as follows: the utility model discloses a multifunctional microfluidic chip reaction device for preparing hydrogen peroxide, which comprises a microfluidic chip reactor, a clamp mechanism and a plurality of dams arranged on a microfluidic chip, wherein the microfluidic chip reactor comprises a cover plate and the microfluidic chip, the cover plate is bonded on the microfluidic chip in a hot-pressing mode, and the microfluidic chip reactor is embedded in the clamp mechanism.

The micro-fluidic chip comprises a micro-flow channel and two sections of thin channels, wherein the four sections of the micro-flow channel are sequentially communicated, the micro-flow channel is respectively a pre-mixing micro-channel, a first reaction micro-channel, an effluent secondary mixing channel and a second reaction micro-channel, the pre-mixing micro-channel is connected with the front end of the first reaction micro-channel, one end of the effluent secondary mixing channel is connected with the rear end of the first reaction micro-channel, the other end of the effluent secondary mixing channel is connected with the front end of the second reaction micro-channel, the micro-fluidic chip is provided with two air inlet holes and an air inlet hole, the air inlet hole is arranged at the front end of the pre-mixing micro-channel, and the two air inlet holes are respectively positioned at two sides of the air inlet hole and are respectively communicated with the pre-mixing micro-channel through one section.

The front end and the rear end of the first reaction microchannel are respectively provided with a first leading-in hole and a first liquid outlet hole, the dam is arranged in front of the first leading-in hole and the first liquid outlet hole on the first reaction microchannel, the front end and the rear end of the second reaction microchannel are respectively provided with a second leading-in hole and a second liquid outlet hole, and the dam is arranged in front of the second leading-in hole and the second liquid outlet hole on the second reaction microchannel.

Preferably, the fixture mechanism comprises a fixture body and a plurality of joint components, the fixture body is provided with a first clamping groove and a second clamping groove matched with the microfluidic chip reactor, the first clamping groove is located above the second clamping groove, the diameter of the first clamping groove is larger than that of the second clamping groove, the microfluidic chip reactor is embedded in the second clamping groove, the bottom of the fixture body is provided with a plurality of threaded holes corresponding to the air inlet hole, the liquid inlet hole, the first introducing hole, the first liquid outlet hole, the second introducing hole and the second liquid outlet hole, and the joint components are in threaded connection with the threaded holes.

Preferably, the joint assembly comprises a joint body with a hollow structure, a conduit and a pipe clamp, wherein the conduit is inserted into the joint body, and the pipe clamp is clamped on the conduit.

Preferably, the first reaction microchannel and the effluent secondary mixing channel are both arranged in a wave curve structure, and the second reaction microchannel is arranged in a linear structure.

Preferably, the height of a plurality of said dams is less than the depth of said microfluidic channels.

Preferably, quartz wool is embedded in the first introduction hole, the first liquid outlet hole, the second introduction hole and the second liquid outlet hole.

Preferably, the cover plate and the microfluidic chip can be made of one of PMMA, glass or metal.

Due to the adoption of the technical scheme, the utility model has the beneficial effects that:

1. the utility model provides a multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide, which is simple in structure and convenient to use, and is provided with two sections of reaction micro-channels, hydrogen, oxygen and water solution are uniformly mixed through the pre-mixing micro-channel, and then hydrogen peroxide can be collected at the tail end of a first reaction micro-channel or hydrogen peroxide can be collected at the tail end of a second reaction micro-channel according to the actual situation, so that the operation flexibility is improved; the secondary mixed channel of the effluent liquid can effectively prolong the reaction time, thereby improving the utilization rate of hydrogen and oxygen and being convenient for improving the concentration (preparing 1 percent hydrogen peroxide) when hydrogen peroxide is extracted at the tail end of the second reaction microchannel.

2. According to the utility model, the overflow of the catalyst particles can be effectively limited by the dams in the first reaction microchannel and the second reaction microchannel, so that the uncontrolled outflow of the catalyst particles can be avoided, the production and preparation cost can be reduced, the poor concentration of a hydrogen peroxide finished product caused by the participation of the catalyst particles can be prevented, and the production efficiency can be improved.

3. According to the utility model, the clamp body is provided with the first clamping groove and the second clamping groove matched with the microfluidic chip reactor, the microfluidic chip reactor is embedded in the second clamping groove, and the microfluidic chip reactor is conveniently clamped from the first clamping groove after the preparation work is finished so as to be separated from the clamp body, so that the practicability of the device is improved; the pipe clamp in the joint assembly is convenient for controlling the flow of conduits for circulating gas, aqueous solution, catalyst particles, hydrogen peroxide and the like to flow in or flow out, the reaction process and conditions are accurately controlled, and the operation is simple and convenient.

4. In the utility model, the first reaction microchannel and the secondary effluent mixing channel are both arranged in a wave curve structure, so that the path and time of oxidation reaction are increased, and the oxidation efficiency is improved; the second reaction microchannel is arranged in a linear structure, so that hydrogen peroxide can be conveniently and quickly collected from the second liquid outlet, and the working efficiency is improved; quartz cotton is inlaid in the first leading-in hole, the first liquid outlet hole, the second leading-in hole and the second liquid outlet hole, the quartz cotton is limited by the dam, the function of secondarily blocking overflow of catalyst particles is achieved, double insurance is achieved, invalid waste of the catalyst particles is avoided, and the concentration of a prepared hydrogen peroxide finished product is guaranteed.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of a microfluidic chip according to the present invention;

FIG. 3 is a cross-sectional view of a first reaction microchannel of the utility model;

FIG. 4 is a sectional view of a second reaction microchannel of the utility model;

FIG. 5 is a top view of the clamping mechanism of the present invention;

FIG. 6 is a front view of the clamp mechanism of the present invention;

the main reference symbols in the drawings are as follows:

1. a cover sheet; 2. a microfluidic chip; 21. a pre-mixing microchannel; 22. a first reaction microchannel; 221. a first introduction hole; 222. A first liquid outlet hole; 23. an effluent secondary mixing channel; 24. a second reaction microchannel; 241. a second introduction hole; 242. a second liquid outlet hole; 25. an air inlet; 26. a liquid inlet hole; 3. a clamp mechanism; 31. a clamp body; 311. a first card slot; 312. a second card slot; 313. a threaded hole; 32. a joint assembly; 321. a connector body; 322. a conduit; 323. a pipe clamp; 4. a dam; 5. and (4) quartz wool.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

As shown in fig. 1 to 6, the multifunctional microfluidic chip reaction device for preparing hydrogen peroxide comprises a microfluidic chip reactor, wherein the microfluidic chip reactor comprises a cover plate 1 and a microfluidic chip 2, the multifunctional microfluidic chip reaction device further comprises a clamp mechanism 3 and a plurality of dams 4 arranged on the microfluidic chip 2, the cover plate 1 is bonded on the microfluidic chip 2 in a hot-pressing mode, and the microfluidic chip reactor is embedded in the clamp mechanism 3.

In this embodiment, as shown in fig. 2, the microfluidic chip 2 includes four segments of microfluidic channels and two segments of thin channels, which are sequentially connected, the four segments of microfluidic channels are respectively a pre-mixing microchannel 21, a first reaction microchannel 22, an effluent secondary mixing channel 23 and a second reaction microchannel 24, the pre-mixing microchannel 21 is connected to the front end of the first reaction microchannel 22, one end of the effluent secondary mixing channel 23 is connected to the rear end of the first reaction microchannel 22, and the other end is connected to the front end of the second reaction microchannel 24, the microfluidic chip 2 is provided with two air inlets 25 and an air inlet 26, the air inlet 26 is arranged at the front end of the pre-mixing microchannel 21, and the two air inlets 25 are respectively located at two sides of the air inlet 26 and are respectively connected to the pre-mixing microchannel 21 through one segment of thin channel. The two air inlets 25 are respectively filled with oxygen and hydrogen, the liquid inlet 26 is filled with aqueous solution, and the three enter the premixing micro-channel 21 for premixing and then flow into the first reaction micro-channel 22. According to the utility model, two sections of reaction microchannels are arranged, hydrogen, oxygen and water solution are uniformly mixed by the premixing microchannel 21, and then hydrogen peroxide can be collected at the tail end of the first reaction microchannel 22 or hydrogen peroxide can be collected at the tail end of the second reaction microchannel 24 according to actual conditions, so that the operation flexibility is improved; the arrangement of the secondary effluent mixing channel 23 can effectively increase the reaction time, thereby improving the utilization rate of hydrogen and oxygen, and facilitating the improvement of the concentration (the preparation concentration of 1 percent hydrogen peroxide) when hydrogen peroxide is extracted at the tail end of the second reaction microchannel. Specifically, the width of the thin channel is 0.2mm, and the depth is 0.12 mm; the width and depth of the premixing microchannel 21, the first reaction microchannel 22, the effluent secondary mixing channel 23 and the second reaction microchannel 24 are all 0.8mm and 0.9mm, respectively.

In this embodiment, as shown in fig. 2 and fig. 3, the front end and the rear end of the first reaction microchannel 22 are respectively provided with a first introducing hole 221 and a first liquid outlet hole 222, and a dam 4 is disposed on the first reaction microchannel 22 in front of the first introducing hole 221 and the first liquid outlet hole 222. As shown in fig. 2 and 4, the front end and the rear end of the second reaction microchannel 24 are respectively provided with a second introduction hole 241 and a second liquid outlet hole 242, and a dam 4 is provided on the second reaction microchannel 24 in front of the second introduction hole 241 and the second liquid outlet hole 242. Specifically, the height of the plurality of dams 4 is smaller than the depth of the microfluidic channel, and in this embodiment, the width of the dam 4 is 0.8mm, and the height of the dam 4 is 0.1 mm. The first introduction hole 221 and the second introduction hole 241 are used for introducing catalyst particles to react with oxygen, hydrogen and an aqueous solution to prepare hydrogen peroxide, wherein the catalyst particles are palladium-alumina catalysts in the embodiment; the first liquid outlet hole 222 and the second liquid outlet hole 242 are used for extracting hydrogen peroxide according to actual conditions, meanwhile, the distance between the dam 4 and the cover plate 1 is basically smaller than the size of catalyst particles, and an area for blocking overflow of the catalyst particles is formed between the two dams 4 on the first reaction microchannel 22 and between the two dams 4 on the second reaction microchannel 24, so that the catalyst particles can be prevented from flowing out in an uncontrolled manner, the production and preparation cost is reduced, the impurity of the poor concentration of a hydrogen peroxide finished product caused by the participation of the catalyst particles can be prevented, and the production efficiency is improved.

In this embodiment, as shown in fig. 1, 5, and 6, the fixture mechanism 3 includes a fixture body 31 and a plurality of connector assemblies 32, the fixture body 31 is provided with a first clamping groove 311 and a second clamping groove 312 adapted to the microfluidic chip reactor, the first clamping groove 311 is located above the second clamping groove 312 and has a diameter larger than that of the second clamping groove 312, the microfluidic chip reactor is embedded in the second clamping groove 312, the bottom of the fixture body 31 is provided with a plurality of threaded holes 313 corresponding to the air inlet hole 25, the liquid inlet hole 26, the first inlet hole 221, the first liquid outlet hole 222, the second inlet hole 241, and the second liquid outlet hole 242, and the connector assemblies 32 are connected to the threaded holes 313 in a threaded manner. The clamp body 31 is provided with a first clamping groove 311 and a second clamping groove 312 matched with the microfluidic chip reactor, the microfluidic chip reactor is embedded in the second clamping groove 312, and the first clamping groove 311 is convenient to clamp the microfluidic chip reactor to separate from the clamp body 31 after the preparation is completed, so that the practicability of the device is improved. Specifically, the joint assembly 32 includes a joint body 321 having a hollow structure, a conduit 322, and a pipe clamp 323, wherein the conduit 322 is inserted into the joint body 321, and the pipe clamp 323 is clamped on the conduit 322. The pipe clamp 323 is convenient for controlling the inflow or outflow of the conduit 322 for circulating gas, aqueous solution, catalyst particles, hydrogen peroxide and the like, accurately controls the reaction process and conditions, and is simple and convenient to operate.

In this embodiment, referring back to fig. 1, the first reaction microchannel 22 and the effluent secondary mixing channel 23 are both arranged in a wave curve structure, and play roles in increasing the oxidation reaction path and the oxidation reaction time and improving the oxidation efficiency; the second reaction microchannel 24 is arranged in a linear structure, so that hydrogen peroxide can be conveniently and rapidly extracted from the second liquid outlet 242, and the working efficiency is improved. Specifically, the quartz wool 5 is embedded in the first introduction hole 221, the first liquid outlet hole 222, the second introduction hole 241 and the second liquid outlet hole 242. The quartz wool 5 is combined with the common limiting effect of the dam 4, so that the function of secondarily blocking the overflow of the catalyst particles is achieved, the ineffective waste of the catalyst particles is avoided, and the concentration of the prepared hydrogen peroxide finished product is ensured. Specifically, the cover plate 1 and the microfluidic chip 2 may be made of one of PMMA, glass or metal. The materials have the advantages of good chemical stability, mechanical property, weather resistance and the like.

The micro-flow channels of the micro-flow control chip 2 comprise but are not limited to four sections, more micro-flow channels can be extended on the basis of the four sections according to the actual test condition for preparing hydrogen peroxide, or the micro-flow channels are superposed on the basis of a single micro-flow control chip 2 for continuous reaction, so that the yield and the production efficiency of the hydrogen peroxide are improved; meanwhile, the device is not limited to preparation and extraction of hydrogen peroxide, hydrogen peroxide overflowing from the first liquid outlet hole 222 or the second liquid outlet hole 242 can be connected to other equipment through the guide pipes 322 communicated with the two holes to perform subsequent chemical synthesis technologies such as coupling reaction, and the device is wider in applicability and higher in practicability.

The working principle of the utility model is as follows: the utility model provides a multifunctional microfluidic chip reaction device for preparing hydrogen peroxide, which is characterized in that a microfluidic channel and a fine channel are carved on the surface of a microfluidic chip 2 by utilizing a photoetching technology, each hole site is arranged, a cover plate 1 is thermally and fixedly bonded on the surface of the microfluidic chip 2 so that the microfluidic channel forms a closed pipeline, a piece of quartz cotton 5 is embedded in each of a first liquid outlet hole 222 and a second liquid outlet hole 242, and then a microfluidic chip reactor formed by bonding together is embedded in a second clamping groove 312 of a clamp body 31; screwing the joint body 321 into each threaded hole 313, and introducing corresponding reaction substances through the guide pipes 322 on the corresponding joint body 321, wherein the first introduction hole 221 and the second introduction hole 241 are twisted out of the joint body 321 after catalyst particles are introduced, and are respectively embedded with a piece of quartz wool 5;

when the prepared hydrogen peroxide needs to be collected in the first liquid outlet 222, the pipe clamp 323 is used for clamping the conduit 322 below the second liquid outlet 242, so that pressure is formed in the effluent secondary mixing channel 23 and the second reaction microchannel 24, and the hydrogen peroxide cannot flow into the effluent secondary mixing channel 23 and the second reaction microchannel 24; similarly, when the hydrogen peroxide prepared by extraction needs to be extracted from the second liquid outlet 242, the pipe clamp 323 is used to clamp the conduit 322 below the first liquid outlet 222, so that the hydrogen peroxide flows downward through the secondary effluent mixing channel 23 to be mixed and the second reaction microchannel 24 to be reacted again, and finally flows into the second liquid outlet 242 to be collected. The method has the technical characteristics that the oxidation reaction efficiency for preparing the hydrogen peroxide is high, the concentration is low, different liquid outlet holes can be selected according to actual conditions to extract the hydrogen peroxide, and the operation flexibility is improved.

The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.

Claims (7)

1. A multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide comprises a micro-fluidic chip reactor, wherein the micro-fluidic chip reactor comprises a cover plate (1) and a micro-fluidic chip (2), the cover plate (1) is bonded on the micro-fluidic chip (2) in a hot-pressing mode, the device is characterized by further comprising a clamp mechanism (3) and a plurality of dams (4) arranged on the micro-fluidic chip (2), the micro-fluidic chip reactor is embedded in the clamp mechanism (3),

the micro-fluidic chip (2) comprises a micro-fluidic channel and two sections of fine channels which are sequentially communicated, the four sections of the micro-fluidic channel are respectively a pre-mixing micro-channel (21), a first reaction micro-channel (22), an effluent secondary mixing channel (23) and a second reaction micro-channel (24), the pre-mixing micro-channel (21) is connected with the front end of the first reaction micro-channel (22), one end of the effluent secondary mixing channel (23) is connected with the rear end of the first reaction micro-channel (22), the other end of the effluent secondary mixing channel is connected with the front end of the second reaction micro-channel (24), the micro-fluidic chip (2) is provided with two air inlets (25) and an air inlet hole (26), the air inlet hole (26) is arranged at the front end of the pre-mixing micro-channel (21), the two air inlets (25) are respectively positioned at two sides of the air inlet hole (26) and are respectively communicated with the pre-mixing micro-channel (21) through one section of the fine channel,

the front end and the rear end of the first reaction microchannel (22) are respectively provided with a first introduction hole (221) and a first liquid outlet hole (222), the dam (4) is arranged on the first reaction microchannel (22) in front of the first introduction hole (221) and the first liquid outlet hole (222), the front end and the rear end of the second reaction microchannel (24) are respectively provided with a second introduction hole (241) and a second liquid outlet hole (242), and the dam (4) is arranged on the second reaction microchannel (24) in front of the second introduction hole (241) and the second liquid outlet hole (242).

2. The multifunctional micro-fluidic chip reaction device for preparing hydrogen peroxide according to claim 1, wherein the clamp mechanism (3) comprises a clamp body (31) and a plurality of connector assemblies (32), the clamp body (31) is provided with a first clamping groove (311) and a second clamping groove (312) matched with the micro-fluidic chip reactor, the first clamping groove (311) is positioned above the second clamping groove (312) and has a diameter larger than that of the second clamping groove (312), the micro-fluidic chip reactor is embedded in the second clamping groove (312), the bottom of the clamp body (31) is provided with a plurality of threaded holes (313) corresponding to the air inlet hole (25), the liquid inlet hole (26), the first lead-in hole (221), the first liquid outlet hole (222), the second lead-in hole (241) and the second liquid outlet hole (242), the joint assembly (32) is connected to the threaded hole (313) in a threaded manner.

3. The multifunctional microfluidic chip reaction device for preparing hydrogen peroxide according to claim 2, wherein the connector assembly (32) comprises a connector body (321) with a hollow structure, a conduit (322) and a pipe clamp (323), the conduit (322) is inserted into the connector body (321), and the pipe clamp (323) is clamped on the conduit (322).

4. The multifunctional microfluidic chip reaction device for preparing hydrogen peroxide according to claim 1, wherein the first reaction microchannel (22) and the effluent secondary mixing channel (23) are both arranged in a wave curve structure, and the second reaction microchannel (24) is arranged in a linear structure.

5. The multifunctional microfluidic chip reaction device for preparing hydrogen peroxide according to claim 1, wherein the height of the plurality of dams (4) is less than the depth of the microfluidic channels.

6. The multifunctional microfluidic chip reaction device for preparing hydrogen peroxide according to claim 1, wherein quartz wool (5) is embedded in the first introduction hole (221), the first liquid outlet hole (222), the second introduction hole (241) and the second liquid outlet hole (242).

7. The multifunctional microfluidic chip reaction device for preparing hydrogen peroxide according to claim 1, wherein the cover plate (1) and the microfluidic chip (2) are made of one of PMMA, glass or metal.

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