Microchannel reactor, photocatalytic reaction device
By designing the arc-shaped channel and fluid distribution structure of the microchannel reactor, the problems of poor mass transfer and difficult cleaning of traditional reactors are solved, achieving high-efficiency mass transfer, low energy consumption and convenient cleaning.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEIDALI IND CHIBI CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional batch and tubular reactors are large in volume, have poor mass transfer efficiency, are difficult to clean, and have significant energy losses.
The microchannel reactor is designed with an arc-shaped channel and a fluid splitting structure. The surface of the fluid splitting side is lower than the opposite surface to promote convective mixing of the liquid sample and improve mass transfer. The removable substrate structure facilitates cleaning.
It improves mass transfer efficiency and degradation efficiency, reduces energy consumption, lowers cleaning difficulty, increases reactant capacity, and improves production efficiency.
Smart Images
Figure CN224541703U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of microreactor technology, and in particular to a microchannel reactor and a photocatalytic reaction device. Background Technology
[0002] Reactors play a crucial role in the industrial field as equipment used to realize chemical reaction processes. The reactors commonly used in traditional processes include batch reactors and tubular reactors. However, due to the large volume of batch reactors and tubular reactors, the mass transfer effect during the reaction process is poor, and cleaning and treatment are difficult, resulting in large energy consumption losses. Utility Model Content
[0003] Based on this, this application provides a microchannel reactor and a photocatalytic reaction device. The microchannel reactor has a small volume, good mass transfer effect, convenient cleaning and treatment and low energy consumption.
[0004] The first aspect of this application provides a microchannel reactor, including a substrate. The substrate includes a first substrate and a second substrate that are detachably coupled. Each of the opposing surfaces of the first substrate and the second substrate is provided with an inlet channel, a reaction unit communicating with the inlet channel, and an outlet channel communicating with the reaction unit. The reaction unit includes an arc-shaped channel and a microfluidic channel that are interconnected. A fluid separator is provided in the arc-shaped channel, and the surface of the fluid separator closer to the opposing surface is lower than the opposing surface.
[0005] In some implementations, the surface of the fluid distributor closest to the opposite surface is 0.02 mm to 0.04 mm lower than the opposite surface.
[0006] In some embodiments, the microfluidic channel, the sample inlet channel, and the sample outlet channel each independently satisfy at least one of the following characteristics: (1) a width of 2 mm to 10 mm; (2) a depth of 0.05 mm to 0.5 mm.
[0007] In some implementations, the arcuate channel satisfies at least one of the following characteristics: (1) a length of 4 mm to 6 mm; (2) a width of 5 mm to 20 mm; and (3) a depth of 0.05 mm to 0.5 mm.
[0008] In some implementations, the number of arc-shaped channels and microfluidic channels are each multiple, and the arc-shaped channels and microfluidic channels are arranged alternately and interconnected. The multiple arc-shaped channels and multiple microfluidic channels are distributed along the same direction or in a meandering manner.
[0009] In some implementations, the length of the microfluidic channel between two adjacent arc-shaped channels distributed along the same direction is 1 / 2 to 1 / 8 of the length of the arc-shaped channel.
[0010] In some implementations, the shape of the fluid separator is circular or square.
[0011] In some embodiments, the shape of the fluid separator is rhomboid, with a side length of 1 mm to 4 mm and an angle of 90° to 150° along the liquid flow.
[0012] In some embodiments, the first substrate further includes a first feed port and a second feed port, each of which is independently connected to the reaction unit through a sample feeding channel.
[0013] In some embodiments, the second substrate further includes a first blind via and a second blind via, wherein the first blind via cooperates with the first feed port to form a first sample inlet port, and the second blind via cooperates with the second feed port to form a second sample inlet port.
[0014] In some embodiments, a shielding film is provided on the opposing surfaces of the first substrate and the second substrate.
[0015] The second aspect of this application provides a photocatalytic reaction apparatus, including a microchannel reactor as provided in the first aspect of this application, and a light source for irradiating the microchannel reactor.
[0016] Compared with the prior art, this application has the following beneficial effects:
[0017] The microchannel reactor provided in this application, by setting up an arc-shaped channel and a fluid splitting structure, causes the fluid to be split into two within the arc-shaped channel when it flows through it, and then reunited at the outlet of the arc-shaped channel. This alternating process promotes the convective mixing of the liquid sample, improves the mass transfer effect, increases the degradation efficiency, and has low energy consumption.
[0018] The microchannel reactor used in this application has a small channel size and a large specific surface area, which can accommodate more reactants per unit reactor volume, and thus requires a smaller volume to process the same reactants.
[0019] The microchannel reactor provided in this application eliminates the need for liquid-catalyst separation, thereby improving production efficiency.
[0020] The microchannel reactor provided in this application consists of a first substrate and a second substrate that can be detachably fitted together, which facilitates subsequent disassembly and cleaning and reduces the difficulty of cleaning treatment.
[0021] This application achieves the effect of liquid diversion and the tight bonding between the first and second substrates by lowering the surface of the liquid diverter, i.e., setting the surface of the liquid diverter closer to the opposite surface to be lower than the opposite surface. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of a microchannel reactor in one embodiment of this application.
[0024] Figure 2 This is a schematic diagram of multiple interconnected arc-shaped channels in one embodiment of this application.
[0025] Explanation of reference numerals in the attached figures
[0026] 10. Microchannel reactor;
[0027] 100, First substrate; 200, Second substrate;
[0028] 110, First feed inlet; 120, Second feed inlet; 130, Discharge outlet; 140, Sample inlet channel; 1510, Arc-shaped channel; 1520, Flow divider; 160, Sample outlet channel; 170, Microflow channel; 180, Threaded through hole; 210, First blind hole; 220, Second blind hole; 230, Third blind hole. Detailed Implementation
[0029] A detailed reference is now provided to embodiments of this application, one or more of which are described below. Each embodiment is provided for explanation and not for limitation. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to this application without departing from its scope or spirit. For example, features described or illustrated as part of one embodiment may be used in another embodiment to produce further embodiments.
[0030] Therefore, this application is intended to cover such modifications and variations falling within the scope of the appended claims and their equivalents. Other objects, features, and aspects of this application are disclosed in or will be apparent from the following detailed description. It will be understood by those skilled in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of this application.
[0031] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.
[0032] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.
[0033] In this article, when referring to units of data ranges, if a unit is only followed by the right endpoint, it means that the units of the left and right endpoints are the same.
[0034] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.
[0035] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.
[0036] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.
[0037] like Figures 1-2 As shown, a first aspect of this application provides a microchannel reactor 10, including a substrate. The substrate includes a first substrate 100 and a second substrate 200 that are detachably coupled. Each of the opposing surfaces of the first substrate 100 and the second substrate 200 is provided with an inlet channel 140, a reaction unit communicating with the inlet channel 140, and an outlet channel 160 communicating with the reaction unit. The reaction unit includes an arc-shaped channel 1510 and a microfluidic channel 170 that are interconnected. A separator 1520 is provided in the arc-shaped channel 1510, and the surface of the separator 1520 near the opposing surface is lower than the opposing surface. A photocatalyst film is provided on the inner wall of at least one of the inlet channel 140, the arc-shaped channel 1510, the microfluidic channel 170, and the outlet channel 160.
[0038] It should be noted that, in this application, "width" refers to the dimension perpendicular to the direction of liquid flow within the plane defined by the first direction X and the second direction Y; "length" refers to the dimension along the direction of liquid flow within the plane defined by the first direction X and the second direction Y; "depth" refers to the dimension along a third direction, which is a direction simultaneously perpendicular to the first direction X and the second direction Y; and "height" refers to the dimension along a third direction.
[0039] The microchannel reactor 10 provided in this application, by setting up an arc-shaped channel 1510 and a separator 1520 structure, allows the fluid flowing through the arc-shaped channel 1510 to be divided into two by the separator 1520 within the arc-shaped channel 1510, and then reunited at the outlet of the arc-shaped channel 1510. This alternating process promotes the convective mixing of the liquid sample, improves the mass transfer effect, increases the degradation efficiency, and has low energy consumption.
[0040] The microchannel reactor 10 used in this application has a small channel size and a large specific surface area, which can accommodate more reactants per unit reactor volume, and thus requires a smaller volume to process the same reactants.
[0041] The microchannel reactor 10 provided in this application eliminates the need for separation of liquid and catalyst, thereby improving production efficiency.
[0042] The microchannel reactor 10 provided in this application is composed of a first substrate 100 and a second substrate 200 that can be detachably fitted, which facilitates disassembly and cleaning and reduces the difficulty of cleaning.
[0043] This application performs a surface reduction process on the fluid distributor 1520, that is, sets the surface of the fluid distributor 1520 closer to the opposite surface to be lower than the opposite surface, while ensuring the liquid distribution effect and the tight bonding between the first substrate 100 and the second substrate 200.
[0044] In some embodiments, a photocatalyst film is provided on the inner wall of the sample inlet channel, the arc-shaped channel, the microfluidic channel, and the sample outlet channel.
[0045] In some embodiments, the surface of the fluid separator 1520 on the side closest to the opposite surface is 0.02 mm to 0.04 mm lower than the opposite surface.
[0046] It is understood that this application does not specifically limit the type of photocatalyst film. Without departing from the overall inventive concept of this application, any known photocatalyst film can be applied to this application. The following are examples only, including but not limited to titanium dioxide film, zinc oxide film, nitrogen-doped titanium dioxide film, carbon-doped titanium dioxide film, and TiO2-SiO2 film.
[0047] In some embodiments, the thickness of the photocatalyst film is 10 nm to 1000 nm.
[0048] In some embodiments, a photocatalyst film is prepared on the inner wall of at least one of the sample inlet channel 140, the arc channel 1510, the microfluidic channel 170, and the sample outlet channel 160 using physical vapor deposition.
[0049] In some embodiments, the photocatalyst film is a titanium dioxide film.
[0050] Titanium dioxide thin films were prepared using a vacuum evaporation coating machine and PVD (physical vapor deposition) technology. Specifically, under vacuum conditions, titanium pentoxide (Ti3O5) was heated using an electron gun evaporator, causing its vapor phase to sublimate and deposit onto the inner wall of at least one of the sample inlet channel, arc-shaped channel, microfluidic channel, and sample outlet channel to form a titanium dioxide thin film. The vacuum level was 1 × 10⁻⁶. -5 Toor~6×10 -5 The substrate temperature is 60℃~100℃, the ion bombardment working time is 2min~50min, the argon (Ar) flow rate is 5sccm~80sccm, the oxygen flow rate is 10sccm~200sccm, and the oxygen partial pressure (based on the sum of the argon and oxygen flow rates as a percentage, with oxygen as the percentage of the flow rate) is 10%~80%, in order to prevent titanium ions from losing oxygen during the evaporation process and to ensure that it is completely converted into a titanium dioxide thin film.
[0051] In some embodiments, the distributor 1520 is centrally located within the arcuate channel 1510, and the width of the distributor 1520 is 1 / 2 to 1 / 4 of the width of the arcuate channel 1510.
[0052] It should be noted that the width of the fluid distributor 1520 in this application refers to the maximum width of the fluid distributor 1520, and the width of the arc-shaped channel 1510 refers to the maximum width of the arc-shaped channel 1510.
[0053] If the size of the distributor 1520 is too small, the distribution effect will be poor and the processing will be difficult; while if the size is too large, the internal resistance will be increased. Therefore, this application sets the width of the distributor 1520 to 1 / 2 to 1 / 4 of the width of the arc channel 1510 in order to reduce the processing difficulty, reduce the internal resistance, and improve the distribution effect.
[0054] In some embodiments, the widths of the microfluidic channel 170, the sample inlet channel 140, and the sample outlet channel 160 are each independently 2mm to 10mm, including but not limited to 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm.
[0055] In some embodiments, the depths of the microfluidic channel 170, the sample inlet channel 140, and the sample outlet channel 160 are each independently 0.05 mm to 0.5 mm, including but not limited to 0.05 mm, 0.1 mm, 0.2 mm, 0.4 mm, and 0.5 mm. Further, the depths of the microfluidic channel 170, the sample inlet channel 140, and the sample outlet channel 160 are each independently 0.05 mm to 0.2 mm.
[0056] It should be noted that the widths of the microfluidic channel 170, the sample inlet channel 140, and the sample outlet channel 160 in this application refer to the maximum widths of the microfluidic channel 170, the sample inlet channel 140, and the sample outlet channel 160, respectively. The depths of the microfluidic channel 170, the sample inlet channel 140, and the sample outlet channel 160 refer to the maximum depths of the microfluidic channel 170, the sample inlet channel 140, and the sample outlet channel 160, respectively.
[0057] Since the flow channels of the traditional microchannel reactor 10 are all set to the micrometer scale in all directions, the internal resistance is very large and the liquid flow rate is small. Therefore, this application sets the width of the microchannel 170, the sample inlet channel 140 and the sample outlet channel 160 to the millimeter scale and the depth to the micrometer scale, thereby increasing the liquid flow rate while ensuring the micrometer scale effect.
[0058] In some embodiments, the length H of the arc-shaped channel 1510 is 4mm to 6mm, including but not limited to 4mm, 4.5mm, 5mm, 5.5mm, and 6mm.
[0059] It should be noted that the length H of the arc-shaped channel 1510 refers to the length of a single arc-shaped channel 1510. See [link / reference]. Figure 2 .
[0060] In some embodiments, the width W of the arc-shaped channel 1510 is 5mm to 20mm, including but not limited to 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, and 20mm.
[0061] Because a depth of less than 0.05 mm would create significant resistance to liquid flow, while a depth greater than 0.5 mm would reduce mass transfer efficiency, the depth of the arc-shaped channel 1510 is 0.05 mm to 0.5 mm, including but not limited to 0.05 mm, 0.1 mm, 0.2 mm, 0.4 mm, and 0.5 mm. Further, the depth of the arc-shaped channel 1510 is 0.05 mm to 0.2 mm to reduce resistance and improve mass transfer efficiency.
[0062] It should be noted that, in this application, the width W of the arc-shaped channel 1510 refers to the maximum width of the arc-shaped channel 1510. The depth of the arc-shaped channel 1510 refers to the maximum depth of the arc-shaped channel 1510.
[0063] This application increases the flow rate of liquid while ensuring the micron-scale effect by setting the width W and length H of the arc channel 1510 to millimeters and the depth to micrometers.
[0064] In some embodiments, the arc-shaped channel 1510 is a circular arc-shaped channel 1510, with the line connecting the inlet and outlet of the arc-shaped channel 1510 as the axis of symmetry, and the circular arc-shaped channel 1510 has a bilateral symmetrical structure.
[0065] In some embodiments, the number of arc-shaped channels 1510 and microfluidic channels 170 is independently multiple, the arc-shaped channels 1510 and microfluidic channels 170 are arranged alternately and communicate with each other, and the multiple arc-shaped channels 1510 and multiple microfluidic channels 170 are distributed along the same direction or in a meandering manner.
[0066] In some embodiments, the length of the microfluidic channel 170 between two adjacent arcuate channels 1510 distributed along the same direction is 1 / 2 to 1 / 8 of the length of the arcuate channel 1510.
[0067] In some embodiments, the shape of the fluid separator 1520 is circular or square.
[0068] In some embodiments, the shape of the fluid separator 1520 is rhomboid, with a side length of 1 mm to 4 mm and an angle of 90° to 150° along the liquid flow.
[0069] In some embodiments, the first substrate 100 further includes a first feed port 110 and a second feed port 120, each of which is independently connected to the reaction unit through a sample inlet channel 140 for liquid inflow.
[0070] It is understandable that both the first feed port 110 and the second feed port 120 are through holes provided on the first substrate 100.
[0071] In some embodiments, the first substrate 100 further includes a discharge port 130, which is located at one end of the sample outlet channel 160 away from the reaction unit for liquid outflow.
[0072] In some embodiments, the second substrate 200 further includes a first blind via 210, a second blind via 220, and a third blind via 230. The first blind via 210 cooperates with the first feed port 110 to form a first sample inlet port, and the second blind via 220 cooperates with the second feed port 120 to form a second sample inlet port.
[0073] In some embodiments, both the first substrate 100 and the second substrate 200 are glass substrates.
[0074] Glass substrates include, but are not limited to, one or more of borosilicate glass substrates, quartz glass substrates, and high aluminosilicate glass substrates.
[0075] In some embodiments, threaded through holes 180 are independently provided on the side areas of the first injection port, the second injection port, and the outlet port, and are fixed by bolts engaging with the threaded through holes 180 to prevent leakage from the injection port and the outlet port. In some embodiments, the first cover plate and the second cover plate are bonded together by adhesive.
[0076] In some embodiments, the first cover plate and the second cover plate are bonded together by heat fusion.
[0077] Because a titanium dioxide thin film was deposited on the first substrate 100 and the second substrate 200 before thermal fusion, the opposing surfaces of the first substrate 100 and the second substrate 200 become rough, which in turn prevents the thermal fusion process from being performed and makes it impossible for the first substrate 100 and the second substrate 200 to fit tightly together.
[0078] Therefore, in some embodiments, a shielding film is provided on the opposing surfaces of the first substrate 100 and the second substrate 200 to shield and protect the opposing surfaces, ensuring a tight fit between the first substrate 100 and the second substrate 200.
[0079] However, since the distributors 1520 exist independently and are not connected to each other, it is difficult to perform shielding treatment. Therefore, during the deposition of the titanium dioxide film, the distributors 1520 will also be coated with titanium dioxide film, causing the upper surface of the distributors 1520 (the side surface near the opposite surface) to protrude a portion relative to the first substrate 100. Therefore, this application performs a surface reduction treatment on the distributors 1520, that is, the side surface of the distributors 1520 near the opposite surface is 0.02mm~0.04mm lower than the opposite surface, so as to ensure that the first substrate 100 and the second substrate 200 are tightly bonded together, while ensuring the function of liquid diversion.
[0080] In this application, the preparation method of the microchannel reactor 10 is not particularly limited. Without departing from the overall inventive concept of this application, any known method that can be used to prepare the microchannel reactor 10 can be applied to this application.
[0081] It is understandable that, in the process of preparing the microchannel reactor 10 provided in this application, all processing surfaces need to be chamfered in order to prevent the glass substrate from cracking during processing.
[0082] The second aspect of this application provides a photocatalytic reaction apparatus, including a microchannel reactor 10 as provided in the first aspect of this application, and a light source for irradiating the microchannel reactor 10.
[0083] In some implementations, the light source is an ultraviolet light source and / or a visible light source.
[0084] In some implementations, the wavelength of the light source is 250nm to 600nm.
[0085] It is understood that the light source can be positioned around the microchannel reactor 10, on the upper or lower surfaces of the microchannel reactor 10, or solely on the upper or lower surface of the microchannel reactor 10. In some embodiments, a liquid pump is provided at the first inlet 110 to provide driving force for the reaction liquid, pumping it into the sample inlet channel 140. The velocity of the reaction liquid is 5 mL / min to 30 mL / min, and more specifically, 20 mL / min to 30 mL / min.
[0086] In one specific embodiment, the reaction solution is wastewater.
[0087] An air pump is provided at the second inlet 120. The air pump is connected to the second inlet 120 through a rubber tube and continuously pumps air or oxygen into the sample inlet channel 140 to provide oxygen for the microchannel reactor 10. Oxygen, as one of the reactants in the photocatalytic reaction, acts as an electron acceptor and forms free radical active species.
[0088] In some embodiments, the air flow rate is 5 mL / min to 250 mL / min, and further, the air flow rate is 20 mL / min to 100 L / min.
[0089] In some embodiments, the outlet 130 is connected to a collection bottle via a connecting pipe for collecting the treated reaction solution into the collection bottle.
[0090] Understandably, if multiple cycles are required, the first inlet 110 can be connected to a collection bottle via a connecting pipe, and the liquid to be reacted in the collection bottle can be pumped into the microchannel reactor 10 by a liquid pump for the next processing, thus repeating the reaction cycle. Alternatively, multiple microchannel reactors 10 can be connected in series.
[0091] The third aspect of this application provides a wastewater treatment method, which is carried out in the photocatalytic reaction device provided in the second aspect of this application, and includes the following steps: passing the wastewater into the photocatalytic reaction device for photocatalytic degradation.
[0092] In some embodiments, the wastewater treatment method includes the following steps:
[0093] S1. Wastewater and gas are respectively sent into the injection channel 140, and the wastewater and gas flow sequentially through the injection channel 140, the reaction unit and the outlet channel 160.
[0094] S2. The light source irradiates the microchannel reactor 10, causing the wastewater to undergo photocatalytic degradation.
[0095] It is understandable that the gas could be either air or oxygen.
[0096] In some embodiments, S1 includes: pumping wastewater into the sample inlet channel 140 through the first feed port 110, pumping gas into the sample inlet channel 140 through the second feed port 120, the wastewater and gas forming a mixed sample in the sample inlet channel 140, and the mixed sample flowing sequentially through the sample inlet channel 140, the reaction unit and the sample outlet channel 160.
[0097] Furthermore, this application provides the following specific embodiments and comparative examples to further illustrate the specific implementation of this application and its advantages.
[0098] Example 1
[0099] The microchannel reactor 10 includes a substrate, comprising a first substrate 100 and a second substrate 200 that are detachably coupled. Each of the opposing surfaces of the first substrate 100 and the second substrate 200 is provided with an inlet channel 140, a reaction unit communicating with the inlet channel 140, and an outlet channel 160 communicating with the reaction unit. The reaction unit includes an interconnected arc-shaped channel 1510 and a microfluidic channel 170. A separator 1520 is provided within the arc-shaped channel 1510, with the surface of the separator 1520 near the opposing surface being 0.03 mm lower than the opposing surface. A titanium dioxide film is provided on the inner walls of the inlet channel 140, the arc-shaped channel 1510, the microfluidic channel 170, and the outlet channel 160. The inlet channel 140, the microfluidic channel 170, and the outlet channel 160 have a width of 6 mm and a depth of 0.1 mm. The arc-shaped channel 1510 is an arc-shaped channel with a width of 12.5 mm, a length of 5 mm, and a depth of 0.1 mm. The distance between two adjacent arc-shaped channels 1510 in the same column is 1.5 mm. The fluid distributor 1520 is a rhombus-shaped island with a side length of 2.5 mm and a rhombus angle of 45° along the first direction X.
[0100] Both the first substrate 100 and the second substrate 200 are high borosilicate glass substrates. The first substrate 100 is also provided with a first feed port 110 and a second feed port 120. The first feed port 110 and the second feed port 120 are each independently connected to the reaction unit through the sample inlet channel 140, and are used to feed wastewater and gas into the microfluidic reactor, respectively. The first substrate 100 is also provided with a discharge port 130, which is connected to the sample outlet channel 160 for discharging wastewater and gas from the microfluidic reactor. The second substrate 200 is provided with a first blind hole 210, a second blind hole 220 and a third blind hole 230 respectively corresponding to the first feed port 110 and the second feed port 120, so that after the first substrate 100 and the second substrate 200 are thermally fused together, the first blind hole 210 and the first feed port 110 cooperate to form a liquid inlet port, the second blind hole 220 and the second feed port 120 cooperate to form an air inlet port, and the third blind hole 230 and the discharge port 130 cooperate to form a sample outlet port.
[0101] A shielding film is provided on the opposing surfaces of the first substrate 100 and the second substrate 200. A titanium dioxide thin film is deposited on the inner walls of the sample inlet channel 140, the arc-shaped channel 1510, the microfluidic channel 170, and the sample outlet channel 160 using a physical vapor deposition process. The vacuum degree is 4 × 10⁻⁶. -5 The substrate temperature was 80℃, the ion bombardment working time was 25min, the oxygen partial pressure was 50%, and the thickness of the titanium dioxide film was 500nm.
[0102] The microchannel reactor 10 is equipped with ultraviolet lamps fixed at parallel positions above and below, with a wavelength of 365 nm and an irradiation intensity of 5 mW / cm². 2 .
[0103] A 10 mg / L aqueous solution of methyl orange waste (pH 3.5) is pumped into the sample inlet channel 140 through the first inlet 110 at a flow rate of 30 mL / min. Air is pumped into the sample inlet channel 140 through the second inlet 120 at a flow rate of 60 mL / min. The microchannel reactor 10 is then irradiated with ultraviolet light, causing the methyl orange waste solution to undergo photocatalytic degradation within the microchannel reactor 10. Finally, the solution flows out of the microchannel reactor 10 through the sample outlet channel 160.
[0104] Comparative Example 1
[0105] The reactants were the same as in Example 1, using a 10 mg / L aqueous solution of methyl orange waste (pH 3.5).
[0106] A titanium dioxide film of the same area as in Example 1 was deposited on a flat glass plate. The flat glass plate was placed in a beaker, and the same amount of methyl orange wastewater solution was injected into the beaker. Air was pumped into the methyl orange wastewater solution using a conduit. Ultraviolet lamps with a wavelength of 365 nm and an irradiance of 10 mW / cm² were fixed at parallel positions above and below the beaker. 2 When a beaker is irradiated with ultraviolet light, the methyl orange wastewater solution undergoes photocatalytic degradation within the beaker.
[0107] Test case
[0108] The photocatalytic degradation rate of the wastewater solutions after photocatalytic degradation in Example 1 and Comparative Example 1 was tested.
[0109] Take 5 ml of wastewater sample into a cuvette, insert the cuvette into a spectrophotometer, and measure the absorbance at the wavelength of maximum absorption. The wavelength of maximum absorbance is 485 nm; therefore, measure the absorbance value A of the solution at a wavelength of 485 nm. t The photocatalytic degradation rate η at time t satisfies the following formula:
[0110] η=(A0-A t ) / A0×100%.
[0111] Where A0 is the absorbance of the initial wastewater solution, A t The absorbance is denoted as t. The results are shown in Table 1 below.
[0112] Table 1
[0113] Example Example 1 Comparative Example 1 Complete degradation time (min) 5 72
[0114] As can be seen from the data comparison in Table 1, compared with the comparative example, the microchannel reactor in this application significantly improves the photocatalytic degradation efficiency.
[0115] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0116] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A microchannel reactor, characterized in that, The substrate includes a first substrate and a second substrate that are detachably coupled. Each of the opposing surfaces of the first substrate and the second substrate is provided with a sample inlet channel, a reaction unit communicating with the sample inlet channel, and a sample outlet channel communicating with the reaction unit. The reaction unit includes interconnected arc-shaped channels and microfluidic channels; a fluid separator is provided in the arc-shaped channel, and the surface of the fluid separator on the side closest to the opposite surface is lower than the opposite surface; At least one of the sample inlet channel, the arc-shaped channel, the microfluidic channel, and the sample outlet channel has a photocatalyst film on its inner wall.
2. The microchannel reactor according to claim 1, characterized in that, The surface of the fluid separator closest to the opposite surface is 0.02 mm to 0.04 mm lower than the opposite surface.
3. The microchannel reactor according to claim 1, characterized in that, The microfluidic channel, the sample inlet channel, and the sample outlet channel each independently satisfy at least one of the following characteristics: (1) Width is 2mm~10mm; (2) The depth is 0.05mm~0.5mm.
4. The microchannel reactor according to claim 1, characterized in that, The arc-shaped channel satisfies at least one of the following characteristics: (1) The length is 4mm~6mm; (2) Width is 5mm~20mm; (3) The depth is 0.05mm~0.5mm.
5. The microchannel reactor according to claim 1, characterized in that, The number of the arc-shaped channels and the microfluidic channels are each multiple, and the arc-shaped channels and the microfluidic channels are arranged alternately and are interconnected; The multiple arc-shaped channels and the multiple microfluidic channels are distributed along the same direction or in a meandering manner.
6. The microchannel reactor according to claim 5, characterized in that, The length of the microfluidic channel between two adjacent arc-shaped channels distributed along the same direction is 1 / 2 to 1 / 8 of the length of the arc-shaped channel.
7. The microchannel reactor according to any one of claims 1-6, characterized in that, The shape of the fluid separator is rhomboid, with a side length of 1mm to 4mm and an angle of 90° to 150° along the direction of liquid flow.
8. The microchannel reactor according to any one of claims 1-6, characterized in that, The first substrate further includes a first feed port and a second feed port, each of which is independently connected to the reaction unit through the sample injection channel.
9. The microchannel reactor according to claim 8, characterized in that, The second substrate further includes a first blind via and a second blind via. The first blind via cooperates with the first feed port to form a first sample inlet port, and the second blind via cooperates with the second feed port to form a second sample inlet port.
10. A photocatalytic reaction device, characterized in that, It includes a microchannel reactor as described in any one of claims 1 to 9, and a light source for irradiating the microchannel reactor.