Multistage series microreactor
By designing a multi-stage series microreactor and using structures such as jet and 8-shaped flow baffle, the problems of turbulence and stagnation zone expansion of existing microreactors when the flow rate increases are solved, and efficient fluid mixing and reaction efficiency improvement is achieved .
Patent Information
- Application Number
- CN202421218068.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-30
AI Technical Summary
When the flow rate of existing millimeter-level microreactors increases, fluid turbulence leads to vortex formation and stagnation zones expand, affecting the fluid uniform distribution performance and mixing efficiency, resulting in a decrease in reaction conversion and production efficiency.
A multi-stage series microreactor is designed to continuously split, recombinate, stretch and break through internally etched fluid channels and micro-mixed mixing tanks, using jet flow to continuously split, recombinate, stretch and break, increase the contact area, and improve the fluid uniform distribution performance. The reactor contains a figure-eight flow baffle and a splitter column, which enables efficient mixing through high-speed collision and collision.
It achieves efficient mixing effect under low pressure drop, avoids the convergence of multiphase fluids caused by vortex, and is particularly suitable for the mixing and mass transfer of multiphase fluids, improving reaction efficiency and fluid uniform distribution performance.
Smart Images
Figure CN222446461U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of microreactors, and in particular relates to a multi-stage series microreactor. Background Art
[0002] Microchemical technology is one of the important ways to intensify chemical processes and an important way to achieve safe, green and efficient chemical processes. Its core is the microreactor, which is a reaction device with a microstructure manufactured by micromachining technology. The characteristic size of this device is between a few microns and hundreds of microns. Due to its unique structure, macroscopic flow characteristics and transfer characteristics, it has significant advantages such as controllable reaction time, good mixing effect, large specific surface area, high heat and mass transfer efficiency, easy to scale up, good safety performance and green environmental protection. It is widely used in various rapid mixing, emulsification, mass transfer, heat transfer and reaction processes.
[0003] At present, there are relatively few studies on flow patterns in millimeter-scale microreactors. The most representative millimeter-scale microreactor is Corning Incorporated's advanced flow reactor, whose relatively large characteristic size significantly improves its processing capacity. However, as the flow rate increases, the increased turbulence of the fluid will inevitably form vortices, and the stagnant zone in the reactor will be significantly expanded, which makes the velocity distribution uneven and leads to the formation of local hot spots. Not only does it affect the fluid's uniform distribution performance and mixing efficiency, it also causes its residence time distribution to become wider, and the reaction conversion rate and production efficiency to decrease.
[0004] To this end, it is very necessary to develop a new type of microreactor structure to enhance the fluid mixing process, improve the fluid distribution performance, and achieve rapid mixing and efficient reaction of the components. Utility Model Content
[0005] The purpose of the utility model is to provide a multi-stage series microreactor structure to strengthen the mixing process of the fluid and realize continuous reaction. It uses the jet method to continuously split, compound, stretch and crush the fluid to be mixed, increase the contact area, improve the fluid distribution performance, thereby realizing rapid mixing and efficient reaction.
[0006] In order to achieve the above purpose, the technical solution proposed by the utility model is:
[0007] A multi-stage series microreactor comprises a substrate with a fluid channel etched inside, the substrate is provided with a fluid inlet and a fluid outlet connected to the fluid channel, the fluid channel comprises a plurality of micro-mixing grooves, adjacent micro-mixing grooves are connected by a contraction section, a jet orifice is formed at the inlet of the micro-mixing groove, and an eight-shaped baffle plate and a diverter column arranged corresponding to the jet orifice are arranged in the micro-mixing groove, and the diverter column is arranged downstream of the eight-shaped baffle plate.
[0008] Preferably, in each micro-mixing tank, the distance between the figure-eight baffle and the top jet port is 0.5-1 mm and the opening angle is 25-45°, and the jet port is located on the central axis of the figure-eight baffle.
[0009] Preferably, the figure eight baffle plate comprises two baffle plates which are bilaterally symmetrical along its central axis, and the cross section of the baffle plate is rectangular.
[0010] Preferably, the width of the baffle is 0.3-0.6 mm, and the length is 3-6 mm. In each micro-mixing tank, the distance between the central axis of the figure-eight baffle and the top of the baffle is 0.4-0.6 mm, and the distance from the bottom of the baffle is 1-1.5 mm.
[0011] Preferably, the diverter column is cylindrical with a diameter of 2.5-3.5 mm. In each micro-mixing tank, the distance between the axis of the diverter column and the top jet outlet is 7-8 mm, and the diverter column is located on the central axis of the figure eight baffle.
[0012] Preferably, the length of the micro-mixing tank is 2-4 times the length from the top of the figure eight baffle plate to the corresponding central axis of the diverter column.
[0013] Preferably, the number of the figure eight baffles in each micro-mixing tank is 1 pair.
[0014] Preferably, both sides of the bottom of the micro-mixing tank are symmetrical U-shaped or V-shaped wall structures.
[0015] Preferably, the jet orifice of the downstream micro-mixing tank is directly arranged as a contraction section on the outlet of the upstream micro-mixing tank, so as to realize multi-stage series connection of the micro-mixing tanks.
[0016] Preferably, the fluid inlet comprises a first fluid inlet and a second fluid inlet.
[0017] The utility model also includes other components that enable a multi-stage series microreactor to be used normally, which are all conventional means in the art. In addition, the devices or components not limited in the utility model all adopt the existing technology in the art.
[0018] The working principle of the utility model is that at least two fluids are injected into the fluid channel through the fluid inlet and gathered into one stream, the high-speed fluid collides with the eight-shaped baffle plate and the diverter column at high speed and then accelerates to break, and then collides and mixes along the bottom wall of the micro-mixing tank horizontally, and then gathers the jet again in the contraction section to the next micro-mixing tank; after repeated segmentation, merging and reorganization through a number of serially connected micro-mixing tanks and contraction sections, it is exported through the fluid outlet, thereby achieving a higher mixing effect under low pressure drop, while avoiding the aggregation of multiphase fluids caused by vortexes, and is particularly suitable for the mixing and mass transfer of multiphase fluids. Among them, the eight-shaped baffle plate and the diverter column divide the injected fluid into two, reducing the diffusion distance of the fluid.
[0019] In addition, when the utility model is used, the multi-stage series microreactors can be connected in series and / or in parallel to achieve mixing and reaction of more fluids.
[0020] Compared with the prior art, the beneficial effects of the utility model are: the device uses jets to continuously split, compound, stretch and crush the fluid to be mixed, increase the contact area, improve the fluid distribution performance, and strengthen the fluid mixing process, thereby achieving rapid mixing and efficient, continuous reaction. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the overall structure of the utility model in Example 1.
[0022] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.
[0023] Figure 3 It is a schematic diagram of the cross-sectional shape of the figure eight baffle plate and the diverter column.
[0024] In the figure: 1-substrate, 2-first fluid inlet, 3-second fluid inlet, 4-figure eight baffle, 5-dividing column, 6-micro mixing tank, 7, jet port. DETAILED DESCRIPTION
[0025] The technology of the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0026] Example 1
[0027] like Figures 1 to 3As shown, a multi-stage series microreactor proposed in this embodiment includes a substrate 1 with a fluid channel etched inside, the substrate is provided with a fluid inlet and a fluid outlet connected to the fluid channel, the fluid inlet includes a first fluid inlet 2 and a second fluid inlet 3, the fluid channel includes 5 micro-mixing grooves 6, adjacent micro-mixing grooves are connected by a contraction section, a jet port 7 is formed at the inlet of the micro-mixing groove, and an eight-shaped baffle 4 and a diverter column 5 corresponding to the jet port are provided in the micro-mixing groove, the diverter column is provided downstream of the eight-shaped baffle, and the number of eight-shaped baffles in each micro-mixing groove is 1 pair. The bottom of the micro-mixing groove has symmetrical U-shaped wall structures on both sides, so that the fluid can be compounded at the outlet of the micro-mixing groove.
[0028] In this embodiment, the jet orifice of the downstream micro-mixing tank is directly arranged as a contraction section on the outlet of the upstream micro-mixing tank, so as to realize multi-stage series connection of the micro-mixing tanks.
[0029] Specifically, in each micro-mixing tank, the distance between the eight-shaped baffle plate and the top jet port is 0.6 mm and the opening angle is 30°, and the jet port is located on the central axis of the eight-shaped baffle plate. More specifically, the eight-shaped baffle plate includes two baffle plates that are symmetrical along the central axis thereof, and the cross section of the baffle plate is rectangular, and the width of the baffle plate is 0.5 mm, and the length is 3.6 mm. The distance between the central axis of the eight-shaped baffle plate and the top of the baffle plate is 0.52 mm, and the distance between the central axis of the eight-shaped baffle plate and the bottom of the baffle plate is 1.44 mm.
[0030] More specifically, the diverter column is cylindrical with a diameter of 3 mm. In each micro-mixing tank, the distance between the axis of the diverter column and the jet outlet at its top is 7.48 mm, and the diverter column is located on the central axis of the figure-eight baffle plate. The length of the micro-mixing tank is 2.6 times the length from the top of the figure-eight baffle plate to the corresponding central axis of the diverter column.
[0031] When the multi-stage series microreactor in this embodiment is in use: two fluids are injected into the fluid channel through the fluid inlet and gathered into one stream, the high-speed fluid collides with the eight-shaped baffle and the diverter column at high speed and is accelerated to break, and then collides and mixes laterally along the bottom wall of the micro-mixing tank and is again gathered into the jet to the next micro-mixing tank in the contraction section; after repeated segmentation, merging and reorganization through several series-connected micro-mixing tanks and contraction sections, it is discharged through the fluid outlet, thereby achieving a higher mixing effect under low pressure drop, while avoiding the aggregation of multiphase fluids caused by vortexes, which is particularly suitable for the mixing and mass transfer of multiphase fluids.
[0032] Among them, the eight-shaped baffle and the diverter column divide the injected fluid into two, reducing the diffusion distance of the fluid.
[0033] Example 2
[0034] The difference between this embodiment and embodiment 1 is that in each micro-mixing tank, the distance between the eight-shaped baffle and the top jet orifice is 0.5 mm and the opening angle is 25°, the width of the baffle is 0.3 mm, the length is 3 mm, the distance between the central axis of the eight-shaped baffle and the top of the baffle is 0.4 mm, and the distance from the bottom of the baffle is 1 mm. The diameter of the diverter column is 2.5 mm, and the distance between the axis of the diverter column and the top jet orifice is 7 mm. The length of the micro-mixing tank is twice the length of the corresponding central axis between the top of the eight-shaped baffle and the diverter column.
[0035] Example 3
[0036] The difference between this embodiment and embodiment 1 is that in each micro-mixing tank, the distance between the eight-shaped baffle and the top jet orifice is 0.8 mm and the opening angle is 35°, the width of the baffle is 0.4 mm, the length is 4.5 mm, the distance between the central axis of the eight-shaped baffle and the top of the baffle is 0.5 mm, and the distance between the central axis of the eight-shaped baffle and the bottom of the baffle is 1.3 mm. The diameter of the diverter column is 3.2 mm, and the distance between the axis of the diverter column and the top jet orifice is 7.6 mm. The length of the micro-mixing tank is 3 times the length of the central axis between the top of the eight-shaped baffle and the diverter column.
[0037] Example 4
[0038] The difference between this embodiment and embodiment 1 is that in each micro-mixing tank, the distance between the eight-shaped baffle and the jet outlet at the top thereof is 0.9 mm and the opening angle is 40°, the width of the baffle is 0.45 mm, the length is 5 mm, the distance between the central axis of the eight-shaped baffle and the top of the baffle is 0.56 mm, and the distance between the central axis of the eight-shaped baffle and the bottom of the baffle is 1.4 mm. The diameter of the diverter column is 3.4 mm, the distance between the axis of the diverter column and the jet outlet at the top thereof is 7.8 mm, and the length of the micro-mixing tank is 3.5 times the length of the central axis between the top of the eight-shaped baffle and the diverter column.
[0039] Example 5
[0040] The difference between this embodiment and embodiment 1 is that in each micro-mixing tank, the distance between the eight-shaped baffle and the top jet orifice is 1 mm and the opening angle is 45°, the width of the baffle is 0.6 mm, the length is 6 mm, the distance between the central axis of the eight-shaped baffle and the top of the baffle is 0.6 mm, and the distance between the central axis of the eight-shaped baffle and the bottom of the baffle is 1.5 mm. The diameter of the diverter column is 3.5 mm, and the distance between the axis of the diverter column and the top jet orifice is 8 mm. The length of the micro-mixing tank is 4 times the length of the central axis between the top of the eight-shaped baffle and the diverter column.
[0041] Comparative Example 1
[0042] The difference between this comparative example and Example 1 is that in each micro-mixing tank, the distance between the eight-shaped baffle and the top jet port is 0.4 mm and the opening angle is 20°, the width of the baffle is 0.2 mm, the length is 2 mm, the distance between the central axis of the eight-shaped baffle and the top of the baffle is 0.3 mm, and the distance from the bottom of the baffle is 0.8 mm. The diameter of the diverter column is 2 mm, and the distance between the axis of the diverter column and the top jet port is 6 mm. The length of the micro-mixing tank is 1.8 times the length of the central axis between the top of the eight-shaped baffle and the diverter column.
[0043] Comparative Example 2
[0044] The difference between this comparative example and Example 1 is that in each micro-mixing tank, the distance between the eight-shaped baffle and the top jet orifice is 1.5 mm and the opening angle is 50°, the width of the baffle is 0.8 mm, the length is 7 mm, the distance between the central axis of the eight-shaped baffle and the top of the baffle is 0.8 mm, and the distance between the central axis of the eight-shaped baffle and the bottom of the baffle is 1.8 mm. The diameter of the diverter column is 4 mm, and the distance between the axis of the diverter column and the top jet orifice is 9 mm. The length of the micro-mixing tank is 4.5 times the length of the central axis between the top of the eight-shaped baffle and the diverter column.
[0045] Comparative experiment:
[0046] The multi-stage series microreactors described in Examples 1 to 5 and Comparative Examples 1 to 2 were respectively used to mix water and kerosene-benzoic acid at a ratio of 1:1 at different flow rates, and the total volume mass transfer number was calculated based on the concentration difference of benzoic acid at the inlet and outlet to judge the performance of the reactor.
[0047] The experimental results are shown in the following table:
[0048]
[0049] The above experimental results show that the multi-stage series microreactor proposed in the embodiment of the present invention has a higher total volume mass transfer coefficient and better reactor performance at different flow rates compared with the comparative example and the prior art.
[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A multi-stage series microreactor, comprising a substrate having a fluid channel etched therein, wherein the substrate is provided with a fluid inlet and a fluid outlet connected to the fluid channel, characterized in that: The fluid channel includes a plurality of micro-mixing grooves, adjacent micro-mixing grooves are connected by contraction sections, a jet port is formed at the inlet of the micro-mixing groove, and an eight-shaped baffle plate and a diverter column corresponding to the jet port are arranged in the micro-mixing groove, and the diverter column is arranged downstream of the eight-shaped baffle plate.
2. The multi-stage series microreactor according to claim 1, characterized in that: In each micro-mixing tank, the distance between the eight-shaped baffle plate and the top jet port is 0.5-1 mm and the opening angle is 25-45°. The jet port is located on the central axis of the eight-shaped baffle plate.
3. The multi-stage series microreactor according to claim 2, characterized in that: The eight-shaped baffle plate includes two baffle plates that are symmetrical along its central axis, and the cross section of the baffle plate is rectangular.
4. The multi-stage series microreactor according to claim 3, characterized in that: The width of the baffle is 0.3-0.6 mm, and the length is 3-6 mm. In each micro-mixing tank, the distance between the central axis of the figure-eight baffle and the top of the baffle is 0.4-0.6 mm, and the distance between the central axis and the bottom of the baffle is 1-1.5 mm.
5. The multi-stage series microreactor according to claim 4, characterized in that: The diverter column is cylindrical with a diameter of 2.5-3.5 mm. In each micro-mixing tank, the distance between the axis of the diverter column and the top jet outlet is 7-8 mm, and the diverter column is located on the central axis of the figure eight baffle.
6. The multi-stage series microreactor according to claim 5, characterized in that: The length of the micro-mixing tank is 2-4 times the length of the central axis corresponding to the top of the eight-shaped baffle plate in the micro-mixing tank to the diverter column.
7. The multi-stage series microreactor according to claim 1, characterized in that: There is one pair of figure eight baffles in each micro-mixing tank.
8. The multi-stage series microreactor according to claim 1, characterized in that: The bottom of the micro-mixing tank has two symmetrical U-shaped or V-shaped wall structures on both sides.
9. The multi-stage series microreactor according to claim 1, characterized in that: The jet orifice of the downstream micro-mixing tank is directly arranged on the outlet of the upstream micro-mixing tank as a contraction section, so as to realize the multi-stage series connection of each micro-mixing tank.
10. The multi-stage series microreactor according to any one of claims 1 to 9, characterized in that: The fluid inlet includes a first fluid inlet and a second fluid inlet.