3D printing continuous flow microreactor and dimethyl sulfoxide reaction device

Abstract

The invention discloses a 3D printing continuous flow microreactor and a dimethyl sulfoxide reaction device, the continuous flow microreactor comprises a plurality of layers of microchannel groups which are connected in series from front to back, and the microchannel groups comprise channel units; each channel unit comprises a Y-shaped upper pipe, an upper annular pipe, transition pipes, lower annular pipes, a Y-shaped lower pipe and a connecting pipe, the multiple transition pipes are located in the middle of the channel unit, the multiple upper annular pipes are arranged above the transition pipes, the Y-shaped upper pipes are arranged above the upper annular pipes in an inverted mode, the multiple lower annular pipes are arranged below the transition pipes, and the Y-shaped lower pipes are arranged below the lower annular pipes; and in every two adjacent layers of micro-channel groups, the discharging end of the front micro-channel group is communicated with the feeding end of the rear micro-channel group. A dimethyl sulfoxide reaction device is formed based on the continuous flow microreactor. According to the method, the existing dimethyl sulfoxide production process is simplified, the production cost is reduced, the product purity is high, byproducts are few, waste water and waste gas are less, and the requirement of green chemical development is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of microreactors, and particularly relates to a 3D printed continuous flow microreactor and a reaction device for dimethyl sulfoxide. Background Art

[0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound with the molecular formula C2H6OS. It is a colorless, odorless, and transparent liquid at room temperature, with characteristics such as high polarity, high boiling point, and good thermal stability. It can dissolve in most organic substances such as ethanol, propanol, benzene, and chloroform. It is a very important organic solvent and pharmaceutical intermediate, and is therefore also known as the "universal" solvent. With the rapid development of related fields such as fine chemicals and pharmaceuticals, the market demand for DMSO is increasing continuously, showing a strong development momentum, and the market scale is expected to exceed 10 billion. At the same time, higher requirements are also put forward for its preparation efficiency, process safety, environmental protection, and quality.

[0003] In the industrial production of dimethyl sulfoxide, the traditional process mainly uses dimethyl sulfide (DMS) to prepare through an oxidation reaction. Common oxidants include nitric acid, oxygen, or ozone, etc. However, the existing technology generally has the problem that the production process is difficult to achieve continuous operation, resulting in low production efficiency, high energy consumption, and insufficient product quality stability, which seriously restricts large-scale industrial applications. The specific technical bottlenecks are as follows:

[0004] Complexity of the reaction system and limitations of batch operation: The synthesis of DMSO involves a strongly exothermic oxidation reaction, and the reaction conditions (such as temperature, pressure, oxidant concentration, etc.) need to be precisely controlled to avoid the excessive generation of by-products (such as dimethyl sulfone). Traditional batch reactors need to be frequently started and stopped to adjust the reaction process, resulting in low equipment utilization rate, long operation cycle, and difficult complete reproduction of reaction conditions between batches, affecting product consistency.

[0005] Complicated separation and purification process: The reaction mixture contains unreacted DMS, by-products, and residual oxidants. Due to the complexity of the reaction system and the limitations of batch operation, more by-products may be generated during the production process, and purification is required through multiple steps such as distillation and extraction. The processing capacity of batch separation equipment is limited, and the frequent switching of operation units leads to an increase in energy consumption, making it difficult to efficiently couple with a continuous reaction system.

[0006] Safety and environmental protection risks: During the batch production process, the frequent heating and pressurization of the reaction system and the operation of feeding oxidants are prone to cause local overheating or explosion risks. In addition, the treatment cost of nitrogen-containing wastewater and waste gas generated by the nitric acid oxidation process is high, making it difficult to meet the environmental protection requirements of green chemistry.

[0007] In recent years, although some research has attempted to improve production equipment, true continuous production has still not been achieved. Therefore, developing an efficient, stable, and environmentally friendly continuous production equipment for DMSO has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] To solve the above technical problems, the object of the present invention is to provide a 3D printed continuous flow microreactor and a reaction device for dimethyl sulfoxide, which simplifies the existing dimethyl sulfoxide production process, reduces production costs, and has high product purity, few by-products, and less wastewater and waste gas, meeting the requirements of the development of green chemistry.

[0009] To achieve the above invention object, the technical solutions adopted by the present invention are as follows:

[0010] In the first aspect of the present invention, the present invention proposes a 3D printed continuous flow microreactor, including a multi-layer microchannel group connected in series before and after, and the multi-layer microchannel group is integrally formed by 3D printing;

[0011] The microchannel group includes one or more channel units, and multiple channel units are connected in series;

[0012] The channel unit includes a Y-shaped upper tube, an upper annular tube, a transition tube, a lower annular tube, a Y-shaped lower tube, and a connecting tube. Multiple transition tubes are arranged horizontally in the middle of the channel unit, multiple upper annular tubes are arranged above the transition tubes, the upper annular tubes are connected to the transition tubes through the connecting tubes, the Y-shaped upper tube is arranged upside down above the upper annular tubes, the bottom branch of the Y-shaped upper tube is connected to the upper annular tubes through the connecting tubes, multiple lower annular tubes are arranged below the transition tubes, the lower annular tubes are connected to the transition tubes through the connecting tubes, the Y-shaped lower tube is arranged below the lower annular tubes, and the top branch of the Y-shaped lower tube is connected to the lower annular tubes through the connecting tubes;

[0013] The first channel unit in one layer of the microchannel group serves as the feed end, and the last channel unit is the discharge end. The feed end of the first layer of the microchannel group serves as the raw material feed end, and the discharge end of the last layer of the microchannel group serves as the product discharge end. In adjacent two layers of the microchannel group, the discharge end of the microchannel group in the front position is connected to the feed end of the microchannel group in the rear position through a connecting tube.

[0014] Preferably, in one channel unit, the number of upper annular tubes is n, n≥2 and n is an even number. One of the bottom branches of the Y-shaped upper tube is connected to the adjacent n / 2 upper annular tubes, and the other bottom branch of the Y-shaped upper tube is connected to the remaining adjacent n / 2 upper annular tubes;

[0015] The number of lower annular tubes is also n, n≥2 and n is an even number. One of the top branches of the Y-shaped lower tube is connected to the adjacent n / 2 lower annular tubes, and the other top branch of the Y-shaped lower tube is connected to the remaining adjacent n / 2 lower annular tubes.

[0016] More preferably, within one channel unit, the number of transition tubes is n - 1. Each transition tube is respectively connected to two adjacent upper annular tubes through two connecting tubes, and each transition tube is respectively connected to two adjacent lower annular tubes through two connecting tubes.

[0017] More preferably, the number of both the upper annular tubes and the lower annular tubes is 4;

[0018] One of the bottom branches of the Y-shaped upper tube is connected to 2 adjacent upper annular tubes, and the other bottom branch of the Y-shaped upper tube is connected to the remaining 2 adjacent upper annular tubes;

[0019] One of the top branches of the Y-shaped lower tube is connected to 2 adjacent lower annular tubes, and the other top branch of the Y-shaped lower tube is connected to the remaining 2 adjacent lower annular tubes.

[0020] More preferably, the number of transition tubes is 3. Among the 4 upper annular tubes, the materials of every 2 adjacent upper annular tubes converge in one transition tube, and the materials in each transition tube are split and flow into 2 adjacent lower annular tubes.

[0021] Preferably, the number of layers of the microchannel group is greater than or equal to two, and a temperature measuring tube is arranged at the connection of the middle two layers of the microchannel group.

[0022] Preferably, within the first layer of the microchannel group, a plurality of feed tubes are arranged at the feed end of the first channel unit;

[0023] Within the last layer of the microchannel group, a discharge tube is arranged at the discharge end of the last channel unit.

[0024] More preferably, the number of feed tubes is two.

[0025] In the second aspect of the present invention, the present invention provides a reaction device for dimethyl sulfoxide, which includes the above-mentioned continuous flow microreactor, and also includes a housing and a heat exchange device. The continuous flow microreactor 1 is located within the housing to form a reactor, and the reactor is located within the heat exchange device, and the reaction temperature of the reactor is controlled by the heat exchange device.

[0026] Preferably, within the heat exchange device, the number of reactors is greater than or equal to one, and a plurality of reactors are connected in series.

[0027] Preferably, the housing is provided with a feed port, a discharge port and a temperature measuring port. The number of feed ports is the same as the number of feed tubes, and each feed port is connected to the corresponding feed tube, the discharge port is connected to the discharge tube, and the temperature measuring port is connected to the temperature measuring tube.

[0028] Advantageous effects:

[0029] Compared with traditional kettle reactors and plate reactors, according to the basic characteristics of the thioether oxidation reaction, the present invention greatly improves the heat exchange capacity of the reaction while ensuring strong mixing and mass transfer effects of the microchannel structure, and can ensure that nearly 80% of the reaction is completed within dozens of seconds in the microchannel, and ensure that the heat generated by the reaction can be quickly transferred out in a short time, simplifies the existing dimethyl sulfoxide production process, reduces production costs, and has high product purity, few by-products, and less waste water and waste gas, meeting the requirements of the development of green chemistry. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure shows an overall schematic diagram of the continuous flow microreactor of the present invention;

[0031] Figure 2 The figure shows a front schematic diagram of the continuous flow microreactor of the present invention, in which a cross-sectional schematic diagram of the first layer of microchannel groups is shown;

[0032] Figure 3 The figure shows a schematic diagram of the reaction device for dimethyl sulfoxide of the present invention.

[0033] Reference numerals: 1 - continuous flow microreactor, 11 - microchannel group, 12 - channel unit, 13 - feed pipe, 14 - discharge pipe, 15 - temperature measuring pipe;

[0034] 121 - Y-shaped upper pipe, 122 - upper annular pipe, 123 - transition pipe, 124 - lower annular pipe, 125 - Y-shaped lower pipe, 126 - connecting pipe; 2 - outer shell, 21 - feed port, 22 - discharge port, 23 - temperature measuring port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other embodiments can be obtained.

[0036] As Figures 1-3 shown, the present invention provides a microreactor device. Based on its unique pipeline design, it has strong mixing effects and strong mass transfer and heat transfer effects, effectively improves the overall heat exchange capacity of the device, has a relatively accurate temperature control effect, and the heat generated during the preparation of dimethyl sulfoxide is quickly transferred to reduce the generation of by-products. As Figures 1-2As shown, the continuous flow microreactor 1 of the present invention is integrally formed by 3D printing, and includes a multi-layer microchannel group 11 connected in series front and back. During the transportation process of the raw materials in the microchannel group 11, they come into contact and react. A large amount of heat generated by the reaction is quickly exchanged with the external refrigerant based on the special structure of the microchannel group 11, and the temperature of the reaction process can be precisely controlled.

[0037] The technical solution of the present invention will be introduced in detail below with specific structures.

[0038] Regarding each layer of the microchannel group 11, the microchannel group 11 includes one or more channel units 12, and multiple channel units 12 are connected in parallel in series. The channel unit 12 is in a spindle-like shape, as Figure 1 and 2 shown. The channel unit 12 includes a Y-shaped upper tube 121, an upper annular tube 122, a transition tube 123, a lower annular tube 124, a Y-shaped lower tube 125, and a connecting tube 126. Multiple transition tubes 123 are arranged horizontally in the middle of the channel unit 12. Multiple upper annular tubes 122 are arranged above the transition tubes 123. The upper annular tubes 122 are communicated with the transition tubes 123 through the connecting tubes 126. The Y-shaped upper tube 121 is arranged upside down above the upper annular tubes 122. The bottom branch of the Y-shaped upper tube 121 is communicated with the upper annular tubes 122 through the connecting tubes 126. Multiple lower annular tubes 124 are arranged below the transition tubes 123. The lower annular tubes 124 are communicated with the transition tubes 123 through the connecting tubes 126. The Y-shaped lower tube 125 is arranged below the lower annular tubes 124. The top branch of the Y-shaped lower tube 125 is communicated with the lower annular tubes 124 through the connecting tubes 126, thus forming a spindle-like channel unit 12 structure.

[0039] It is easy to understand that inside the channel unit 12, with the position of the transition tube 123 as the center, the Y-shaped upper tube 121, the upper annular tube 122, and the connecting tubes 126 therebetween form a tree-like structure. Similarly, the lower annular tube 124, the Y-shaped lower tube 125, and the connecting tubes 126 therebetween also form a tree-like structure. Preferably, as Figure 1 and 2 shown, inside the channel unit 12, with the position of the transition tube 123 as the center, the internal structure is symmetric up and down.

[0040] In the present invention, the Y-shaped upper tube 121 is in a reverse inverted state. The number of top branches of the Y-shaped upper tube 121 is one, and the number of bottom branches of the Y-shaped upper tube 121 is two. The Y-shaped lower tube 125 is in a positive state. The number of top branches of the Y-shaped lower tube 125 is two, and the number of bottom branches of the Y-shaped lower tube 125 is one. It is easy to understand that for one channel unit 12, one of the Y-shaped upper tube 121 and the Y-shaped lower tube 125 is for feeding, and the other is for discharging.

[0041] Both the upper annular pipe 122 and the lower annular pipe 124 refer to pipes with annular internal pipelines. The shape of the transition pipe 123 is not limited, and it plays a role in partially converging materials. Then, after the materials flow out of the transition pipe 123, they are further divided by the lower annular pipe 124. In the present invention, multiple transition pipes 123 are not directly connected to each other, multiple upper annular pipes 122 are not directly connected to each other, and similarly, multiple lower annular pipes 124 are not directly connected to each other.

[0042] Combined Figure 1 with 2 it can be seen that the first channel unit 12 in the first layer of microchannel groups 11 serves as the feed end, and the last channel unit 12 serves as the discharge end. The feed end of the first layer of microchannel groups 11 serves as the raw material feed end, and the discharge end of the last layer of microchannel groups 11 serves as the product discharge end. In adjacent two layers of microchannel groups 11, the discharge end of the microchannel group 11 in the front position is connected to the feed end of the microchannel group 11 in the rear position through the connecting pipe 126.

[0043] When only one channel unit 12 is included in one layer of microchannel groups 11, the top branch pipes of the Y-shaped upper pipes 121 in adjacent two layers of microchannel groups 11 are connected through the connecting pipe 126, or the bottom branch pipes of the Y-shaped lower pipes 125 are connected through the connecting pipe 126. The Y-shaped upper pipe 121 or the Y-shaped lower pipe 125 of the channel unit 12 in the first layer of microchannel groups 11 serves as the raw material feed end, and the Y-shaped upper pipe 121 or the Y-shaped lower pipe 125 of the channel unit 12 in the last layer of microchannel groups 11 serves as the product discharge end.

[0044] When two or more channel units 12 are included in one layer of microchannel groups 11, the multiple channel units 12 are arranged side by side, and the Y-shaped upper pipes 121 of adjacent channel units 12 are connected through the connecting pipe 126, or the Y-shaped lower pipes 125 are connected through the connecting pipe 126. That is, after the materials enter one layer of microchannels, they will flow through all the channel units 12.

[0045] Figure 1 and 2 show the case where two channel units 12 are included in one layer of microchannel groups 11. The top branch pipe of the Y-shaped upper pipe 121 of the first channel unit 12 serves as the feed end, and the bottom branch pipe of the Y-shaped lower pipe 125 serves as the discharge end. The bottom branch pipe of the Y-shaped lower pipe 125 of the second channel unit 12 serves as the feed end, and the Y-shaped upper pipe 121 serves as the discharge end. The Y-shaped upper pipe 121 of the first channel unit 12 in the subsequent adjacent microchannel group 11 is connected to the Y-shaped upper pipe 121 of the second channel unit 12 in the previous microchannel group 11, thereby realizing the series connection of multiple layers of microchannel groups 11.

[0046] Taking a layer of microchannel group 11 as an example, the material flows into the first channel unit 12 from top to bottom. First, it is split into two streams along the Y-shaped upper tube 121, and the two streams of material flow into multiple upper annular tubes 122 respectively. Subsequently, they are initially converged in multiple transition tubes 123, and then flow into multiple lower annular tubes 124 respectively. Finally, they enter the Y-shaped lower tube 125 to converge, and flow into the second channel unit 12 and flow upward. The material converges at the Y-shaped upper tube 121 of the second channel unit 12 and flows into the next layer of microchannel group 11.

[0047] In the present invention, the upper annular tube 122, the lower annular tube 124, the transition tube 123, and the connecting tubes 126 between them play a role in increasing the contact area between the microchannel group 11 and the refrigerant. Moreover, the material experiences multiple splits - partial convergences - re-splits - convergences during the transportation process, which is conducive to the full mixing and contact between the raw materials and accelerates the progress of the reaction. Since the material is dispersed in each small area of the channel unit 12, the heat released by it is quickly taken away, and the temperature of the corresponding area is within a suitable range, effectively reducing the occurrence of side reactions and the generation of by-products.

[0048] Preferably, in one channel unit 12, the number of upper annular tubes 122 is n, where n≥2 and n is an even number. One bottom branch of the Y-shaped upper tube 121 is connected to adjacent n / 2 upper annular tubes 122, and the other bottom branch of the Y-shaped upper tube 121 is connected to the remaining n / 2 adjacent upper annular tubes 122. That is, the Y-shaped upper tube 121 and the upper annular tubes 122 form a tree-like structure, and the material forms multiple non-converging streams after passing through the Y-shaped upper tube 121 and the upper annular tubes 122.

[0049] The number of lower annular tubes 124 is also n, where n≥2 and n is an even number. One top branch of the Y-shaped lower tube 125 is connected to adjacent n / 2 lower annular tubes 124, and the other top branch of the Y-shaped lower tube 125 is connected to the remaining n / 2 adjacent lower annular tubes 124. That is, the Y-shaped lower tube 125 and the lower annular tubes 124 form an inverted tree-like structure, and multiple streams of material converge into one stream at the bottom branch of the Y-shaped lower tube 125.

[0050] As Figure 1 and 2 shown, n is preferably 4. That is, one bottom branch of the Y-shaped upper tube 121 is connected to adjacent 2 upper annular tubes 122, the other bottom branch of the Y-shaped upper tube 121 is connected to the remaining 2 adjacent upper annular tubes 122, one top branch of the Y-shaped lower tube 125 is connected to adjacent 2 lower annular tubes 124, and the other top branch of the Y-shaped lower tube 125 is connected to the remaining 2 adjacent lower annular tubes 124.

[0051] Preferably, within one channel unit 12, the number of transition pipes 123 is n - 1. Each transition pipe 123 is respectively connected to two adjacent upper annular pipes 122 through two connecting pipes 126, and each transition pipe 123 is respectively connected to two adjacent lower annular pipes 124 through two connecting pipes 126. More preferably, when the number of both the upper annular pipes 122 and the lower annular pipes 124 is 4, the number of transition pipes 123 is 3. Among the four upper annular pipes 122, the materials of every two adjacent upper annular pipes 122 converge into one transition pipe 123, and the material in each transition pipe 123 is split into the two adjacent lower annular pipes 124.

[0052] In the present invention, the number of layers of the microchannel group 11 is greater than or equal to two. For example, Figure 1 shows that the number of layers is fifteen. Preferably, a temperature measuring pipe 15 is arranged at the connection of the middle two layers of the microchannel group 11 for detecting the material temperature. Cooperating with an external cooling system, the material temperature in the device is monitored within a suitable range.

[0053] Within the first layer of the microchannel group 11, a plurality of feed pipes 13 are arranged at the feed end of the first channel unit 12. As Figure 1 shown, the plurality of feed pipes 13 are all connected to the top branch pipe of the Y-shaped upper pipe 121. Preferably, the number of feed pipes 13 is two. Taking the reaction of thioether and hydrogen peroxide to prepare dimethyl sulfoxide as an example, one of the feed pipes 13 is a thioether feed pipe 13, and the other feed pipe 13 is a hydrogen peroxide feed pipe 13. The multi-strand raw materials are mixed when input, and then transported along the channel unit 12.

[0054] Within the last layer of the microchannel group 11, a discharge pipe 14 is arranged at the discharge end of the last channel unit 12. As Figure 1 shown, the discharge pipe 14 is connected to the top branch pipe of the Y-shaped upper pipe.

[0055] In the present invention, the inner diameter range within the channel unit 12 is 3 - 16 mm. It is easy to understand that the Y-shaped upper pipe 121, the Y-shaped lower pipe 125, and the transition pipe 123 can adopt a structure with a larger inner diameter, and the connecting pipes 126, the upper annular pipes 122, and the lower annular pipes 124 adopt a structure with a smaller inner diameter. Preferably, the upper annular pipe 122 and the lower annular pipe 124 have the same shape and size, and the Y-shaped upper pipe 121 and the Y-shaped lower pipe 125 have the same shape and size.

[0056] The present invention also provides a reaction device for dimethyl sulfoxide, which includes the above-mentioned continuous flow microreactor 1, and also includes a housing 2 and a heat exchange device. The continuous flow microreactor 1 is located within the housing to form a reactor, and the reactor is located within the heat exchange device. The reaction temperature of the reactor is controlled through the heat exchange device. Preferably, within the heat exchange device, the number of reactors is greater than or equal to one, and multiple reactors are connected in series.

[0057] As Figure 3 shown, the outer shell 2 and the continuous flow microreactor 1 are integrally formed by 3D printing, or the outer shell 2 and the continuous flow microreactor 1 are welded together.

[0058] The outer shell 2 can protect the continuous flow microreactor 1. The outer shell 2 is provided with a feed inlet 21, a discharge outlet 22 and a temperature measuring port 23, which are correspondingly communicated with a feed pipe 13, a discharge pipe 14 and a temperature measuring pipe 15. The outer shell 2 can be immersed in a refrigerant to take away the heat released by the continuous flow microreactor 1.

[0059] Furthermore, the space between the outer shell 2 and the continuous flow microreactor 1 can also be used as the space for the refrigerant to flow. The outer shell 2 is provided with a refrigerant inlet and a refrigerant outlet, and the temperature control effect is achieved by contacting the refrigerant with the continuous flow microreactor 1.

[0060] In the present invention, the continuous flow microreactor 1 can be integrally formed by 3D printing with a corrosion-resistant alloy material, such as corrosion-resistant 316L stainless steel.

[0061] Dimethyl sulfide with a purity of 99.5% and hydrogen peroxide with a concentration of 27.5% are mixed in a molar ratio of 1:1.05. The water cooling system is turned on and the temperature is adjusted to 65°C. Then, the materials of the two are transported to the continuous flow microreactor 1 through a feed pump. The reaction can be completed by 60% within 6 - 15 seconds. The delayed reaction will be completely reacted in a subsequent tubular reactor, and finally a high-purity dimethyl sulfoxide product is obtained. By continuously inputting dimethyl sulfide and hydrogen peroxide, the dimethyl sulfoxide product can be continuously produced.

[0062] The above has elaborated in detail on the embodiments provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A 3D printed continuous flow microreactor, characterized in that, It includes a multi-layer microchannel group (11) connected in series front and back, and the multi-layer microchannel group (11) is integrally formed by 3D printing; The microchannel group (11) includes one or more channel units (12), and multiple channel units (12) are connected in series; The channel unit (12) includes a Y-shaped upper tube (121), an upper annular tube (122), a transition tube (123), a lower annular tube (124), a Y-shaped lower tube (125) and a connecting tube (126). Multiple transition tubes (123) are horizontally arranged in the middle of the channel unit (12), and multiple upper annular tubes (122) are arranged above the transition tubes (123). The upper annular tube (122) is communicated with the transition tube (123) through the connecting tube (126). The Y-shaped upper tube (121) is inverted and arranged above the upper annular tube (122), and the bottom branch of the Y-shaped upper tube (121) is communicated with the upper annular tube (122) through the connecting tube (126). Multiple lower annular tubes (124) are arranged below the transition tubes (123), and the lower annular tube (124) is communicated with the transition tube (123) through the connecting tube (126). The Y-shaped lower tube (125) is arranged below the lower annular tube (124), and the top branch of the Y-shaped lower tube (125) is communicated with the lower annular tube (124) through the connecting tube (126); The first channel unit (12) in one layer of the microchannel group (11) serves as the feed end, and the last channel unit (12) is the discharge end. The feed end of the first layer of the microchannel group (11) is the raw material feed end, and the discharge end of the last layer of the microchannel group (11) is the product discharge end. In adjacent two layers of the microchannel group (11), the discharge end of the microchannel group (11) in the front position is communicated with the feed end of the microchannel group (11) in the rear position through the connecting tube (126).

2. The continuous flow microreactor according to claim 1, characterized in that, In one channel unit (12), the number of upper annular tubes (122) is n, where n≥2 and n is an even number. One bottom branch of the Y-shaped upper tube (121) is communicated with adjacent n / 2 upper annular tubes (122), and the other bottom branch of the Y-shaped upper tube (121) is communicated with the remaining adjacent n / 2 upper annular tubes (122); The number of lower annular tubes (124) is also n, where n≥2 and n is an even number. One top branch of the Y-shaped lower tube (125) is communicated with adjacent n / 2 lower annular tubes (124), and the other top branch of the Y-shaped lower tube (125) is communicated with the remaining adjacent n / 2 lower annular tubes (124).

3. The continuous flow microreactor according to claim 2, characterized in that, In one channel unit (12), the number of transition tubes (123) is n - 1. Each transition tube (123) is respectively communicated with two adjacent upper annular tubes (122) through two connecting tubes (126), and each transition tube (123) is respectively communicated with two adjacent lower annular tubes (124) through two connecting tubes (126).

4. The continuous flow microreactor according to claim 2, wherein, The number of both the upper annular tube (122) and the lower annular tube (124) is 4; One bottom branch of the Y-shaped upper tube (121) is communicated with 2 adjacent upper annular tubes (122), and the other bottom branch of the Y-shaped upper tube (121) is communicated with the remaining 2 adjacent upper annular tubes (122); One of the top branches of the Y-shaped lower pipe (125) communicates with two adjacent lower annular pipes (124), and the other top branch of the Y-shaped lower pipe (125) communicates with the remaining two adjacent lower annular pipes (124).

5. The continuous flow microreactor according to claim 4, wherein The number of transition pipes (123) is three. Among the four upper annular pipes (122), the materials of every two adjacent upper annular pipes (122) converge in one transition pipe (123), and the materials in each transition pipe (123) are split and flow into two adjacent lower annular pipes (124).

6. The continuous flow microreactor according to claim 1, characterized in that, The number of layers of the microchannel group (11) is greater than or equal to two, and a temperature measuring pipe (15) is arranged at the connection of the middle two layers of the microchannel group (11).

7. The continuous flow microreactor according to any one of claims 1-6, characterized in that, In the first layer of the microchannel group (11), a plurality of feed pipes (13) are arranged at the feed end of the first channel unit (12); In the last layer of the microchannel group (11), a discharge pipe (14) is arranged at the discharge end of the last channel unit (12).

8. The continuous flow microreactor according to claim 7, wherein The number of feed pipes (13) is two.

9. A reaction device for dimethyl sulfoxide, characterized in that, It includes the continuous flow microreactor (1) as described in claim 7, and also includes a housing (2) and a heat exchange device. The continuous flow microreactor (1) is located inside the housing to form a reactor, and the reactor is located in the heat exchange device, and the reaction temperature of the reactor is controlled by the heat exchange device.

10. The reaction device for dimethyl sulfoxide according to claim 9, wherein, Inside the heat exchange device, the number of reactors is greater than or equal to one, and a plurality of reactors are connected in series.

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