Chemical production microchannel reactor

Abstract

The utility model relates to a chemical production technical field, concretely relates to a chemical production micro -channel reactor, include: upper cover, lower cover, feed pipe, discharge pipe and reaction pipeline, the upper cover and lower cover are fixedly connected through the symmetrical side ear of outer wall, the inner wall of upper cover and lower cover all is equipped with the reaction pipeline that constitutes reaction pipeline. Through setting up, the detachable connecting structure of the symmetrical side ear of upper and lower cover outer wall, the defect that micro -channel dismounts cleaning difficulty is improved, reduces the operation and maintenance cost of later period, through the combination structure of helical disturbance board and globular mixing cavity, shunt chamber, confluence chamber, the problem that only relies on the channel form to improve the mixing efficiency and the mixing depth is insufficient is improved, the raw material first passes through the helical disturbance board of staggered vertical preliminary dispersion, enters globular chamber again and forms vortex to realize depth mixing, and vortex can prolong material residence time and strengthen component fusion, is favorable for promoting the mixing uniformity of multiple raw materials.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to a microchannel reactor for chemical production. Background Technology

[0002] Microchannel reactors are core equipment in fields such as fine chemicals, pharmaceutical intermediate synthesis, and specialty chemical preparation. This invention is mainly used to realize continuous and high-conversion reactions of multi-component chemical raw materials. It can complete multi-stage diversion and convergence reactions through the initial dispersion of spiral disturbance plates and the enhanced mixing of vortex in spherical chambers. At the same time, the detachable cover plate structure facilitates later operation and maintenance and is suitable for batch and continuous chemical production scenarios.

[0003] For example, Chinese patent CN222694719U discloses a microchannel reactor, including a lower substrate and an upper cover plate. A microchannel is provided between the lower substrate and the upper cover plate, and the microchannel is fixed on the lower substrate. The microchannel is S-shaped, with its two ends located outside the lower substrate, forming an inlet and an outlet pipe respectively. Multiple reaction units are provided on the microchannel portion on the lower substrate, with an input straight pipe and an output straight pipe at both ends of each reaction unit. Multiple elliptical channels are provided between the input and output straight pipes. This novel structure effectively solves the problems existing in the prior art, improves the mixing efficiency between liquid phase materials, and ensures that the materials can be uniformly distributed along the entire microchannel, avoiding the problem of insufficient microchannel utilization.

[0004] While the above scheme has the advantages mentioned above, its disadvantages are that the structure of the S-shaped channel combined with the elliptical reaction unit relies solely on the channel shape to improve mixing efficiency, cannot achieve premixing, and lacks a vortex enhancement mechanism, resulting in insufficient mixing depth of raw materials. Utility Model Content

[0005] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is as follows: a microchannel reactor for chemical production, comprising: an upper cover plate, a lower cover plate, an inlet pipe, an outlet pipe, and a reaction pipeline. The upper cover plate and the lower cover plate are fixedly connected by symmetrically arranged lugs on their outer walls. The inner walls of both the upper and lower cover plates are provided with reaction pipes that constitute the reaction pipeline. The reaction pipeline includes an inlet tank, a mixing chamber, multiple diversion chambers, a confluence chamber, and a drain tank. One end of the inlet tank is connected to the mixing chamber. The mixing chamber is connected to the multiple diversion chambers through a connecting channel. The end of the diversion chamber away from the mixing chamber is connected to the confluence chamber through a connecting pipe. One end of the confluence chamber is connected to the drain tank, and the drain tank is connected to the inlet tank in the next set of reaction pipelines. The inner walls of both the inlet tank and the drain tank are fixedly connected with spiral disturbance plates.

[0006] Preferably, the feed pipe and discharge pipe are fixedly connected to the outer wall of the upper cover plate. The feed pipe is connected to multiple feed ports. In use, the basic assembly and fixing work is completed first. The workers can use the through holes on the side ears symmetrically arranged on the outer walls of the upper and lower cover plates to insert bolts, nuts and other fasteners to firmly connect the upper cover plate and the lower cover plate into a whole. This detachable connection method can ensure that the sealed chamber where the reaction pipeline is located has good sealing performance, avoid the risk of leakage of chemical raw materials during the reaction process, and also provide convenient conditions for subsequent equipment inspection, cleaning and maintenance of reaction pipeline, which helps to reduce the difficulty of later operation and maintenance.

[0007] Preferably, the mixing chamber, the diversion chamber, and the confluence chamber are all spherical chambers. The number of side ears on the outer walls of the upper and lower cover plates is at least two sets, and the side ears are provided with through holes for fasteners to achieve a detachable and fixed connection between the upper and lower cover plates. After the raw materials required for chemical production are transported to the reactor by external conveying equipment, they will first enter the feed pipe on the outer wall of the upper cover plate and then enter the liquid inlet tank of the reaction pipe on the inner wall of the upper and lower cover plates simultaneously through multiple feed ports on the feed pipe. During the flow in the liquid inlet tank, the raw materials will continuously come into contact with the spiral disturbance plates fixed on the inner wall of the tank. Since the spiral disturbance plates in the liquid inlet tank are distributed in an interlaced and mutually perpendicular manner, the raw materials will be cut, diverted, and form a preliminary vortex when flowing through the disturbance plates. This not only achieves the preliminary mixing of multi-component raw materials but also disperses any agglomerated particles that may exist in the raw materials.

[0008] Preferably, the spiral disturbance plates on the inner walls of the inlet and outlet tanks are staggered and perpendicular to each other. When the pre-mixed raw materials enter the spherical mixing chamber, the sudden change in flow pattern and space as the raw materials enter the spherical chamber from the tubular inlet tank directly triggers a strong vortex. This vortex causes the raw materials of different components to form irregular swirling flows within the chamber, allowing for further premixing of multiple raw materials. The premixed raw materials are then distributed to multiple spherical distribution chambers via a connecting channel. Similarly, due to the change in channel shape, local vortices are formed at the inlet of the distribution chambers. The flow not only allows the raw materials to spread out in the distribution chambers and increase the contact area with the chamber walls, but also extends the residence time of the raw materials in the chambers, ensuring that the staged chemical reactions are fully carried out. After the reaction in each distribution chamber is completed, the materials flow into the spherical confluence chamber through the connecting pipe. The impact of multiple materials combined with the structural characteristics of the spherical chamber will trigger eddies again, quickly breaking the material stratification and achieving further fusion of materials from different distribution chambers. The fused materials enter the drainage tank, where they are further mixed and reacted under the secondary disturbance of the spiral disturbance plate in the tank, and then enter the next set of reaction pipelines to repeat the above process.

[0009] Preferably, the inner wall of the discharge pipe is provided with an internal thread, the pitch of which is adapted to the connecting thread of a conventional chemical conveying pipeline, so as to facilitate a sealed connection with external chemical production equipment. After the material completes the multi-stage continuous reaction in all reaction pipelines, it will finally converge into the discharge pipe on the outer wall of the upper cover plate. The internal thread on the inner wall of the discharge pipe is pre-set, and its pitch is adapted to the connecting thread of a conventional chemical conveying pipeline, which can facilitate a sealed connection with external collection equipment or subsequent processing devices. This can not only avoid leakage and pollution of materials during the discharge stage, but also ensure the smoothness of the discharge process. Thus, the entire chemical raw material conversion and discharge operation is completed.

[0010] The beneficial effects of this utility model are as follows: 1. This utility model improves the problem of insufficient mixing depth due to the lack of mixing efficiency when relying solely on channel shape to improve mixing efficiency by setting up a combination structure of spiral disturbance plate, spherical mixing chamber, diversion chamber and confluence chamber. The raw materials are first initially dispersed by the intersecting vertical spiral disturbance plate, and then enter the spherical chamber to form vortex to achieve deep mixing. The vortex can prolong the residence time of the material and enhance the fusion of components, which is beneficial to improving the uniformity of mixing of multiple raw materials.

[0011] 2. This utility model improves the shortcomings of microchannels being fixed to the substrate and difficult to disassemble and clean by setting a detachable connection structure with symmetrical side ears on the outer walls of the upper and lower cover plates. This structure allows for cleaning and maintenance of the reaction pipeline by disassembling the cover plates, reducing the later operation and maintenance costs. At the same time, the inner wall of the discharge pipe is adapted to the internal thread design of conventional chemical pipelines, which can be connected to external equipment. Furthermore, the number of reaction stages can be flexibly adjusted for multiple sets of series-connected reaction pipelines, adapting to intermittent and continuous production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the back structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of this utility model; Figure 4 This is a schematic diagram of the reaction pipeline of this utility model; Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0013] In the diagram: 1. Upper cover plate; 2. Lower cover plate; 3. Discharge pipe; 4. Feed pipe; 5. Reaction pipeline; 50. Liquid inlet tank; 51. Mixing chamber; 52. Spiral disturbance plate; 53. Diversion chamber; 54. Merging chamber; 55. Drainage tank. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0015] Example: Please see Figure 1 - Figure 5 This utility model provides a technical solution: a microchannel reactor for chemical production, comprising: an upper cover plate 1, a lower cover plate 2, a feed pipe 4, a discharge pipe 3, and a reaction pipeline 5. The upper cover plate 1 and the lower cover plate 2 are fixedly connected by symmetrically arranged lugs on their outer walls. The inner walls of the upper cover plate 1 and the lower cover plate 2 are each provided with a reaction pipe forming the reaction pipeline 5. The reaction pipeline includes an inlet tank 50, a mixing chamber 51, multiple diversion chambers 53, a confluence chamber 54, and a drain tank 55. One end of the inlet tank 50 is connected to the mixing chamber 51. The mixing chamber 51 is connected to the multiple diversion chambers 53 through a connecting groove. The end of the diversion chamber 53 away from the mixing chamber 51 is connected to the confluence chamber 54 through a connecting pipe. One end of the confluence chamber 54 is connected to the drain tank 55, and the drain tank 55 is connected to the inlet tank 50 in the next set of reaction pipelines. The inner walls of the inlet tank 50 and the drain tank 55 are both fixedly connected with spiral disturbance plates 52.

[0016] The outer wall of the upper cover plate 1 is fixedly connected to the feed pipe 4 and the discharge pipe 3. The feed pipe 4 is connected to multiple feed ports. The mixing chamber 51, the diversion chamber 53 and the confluence chamber 54 are all spherical chambers. The number of side ears on the outer wall of the upper cover plate 1 and the lower cover plate 2 is at least two sets, and the side ears are provided with through holes for fasteners to be inserted, so as to realize the detachable fixed connection between the upper cover plate 1 and the lower cover plate 2.

[0017] The spiral disturbance plates 52 on the inner walls of the liquid inlet tank 50 and the liquid outlet tank 55 are staggered and perpendicular to each other. The inner wall of the discharge pipe 3 is provided with internal threads. The pitch of the internal threads is adapted to the connection threads of conventional chemical conveying pipelines so as to facilitate sealed connection with external chemical production equipment.

[0018] Working principle: When in use, the basic assembly and fixing work is completed first. The staff can use the through holes on the side ears symmetrically arranged on the outer walls of the upper cover plate 1 and the lower cover plate 2 to insert bolts, nuts and other fasteners to firmly connect the upper cover plate 1 and the lower cover plate 2 into a whole. This detachable connection method can ensure that the sealed chamber where the reaction pipeline 5 is located has good sealing performance, avoid the risk of leakage of chemical raw materials during the reaction process, and also provide convenient conditions for subsequent equipment inspection, cleaning and maintenance of the reaction pipeline 5, which helps to reduce the difficulty of later operation and maintenance.

[0019] After the raw materials required for chemical production are transported to the reactor by external conveying equipment, they will first enter the feed pipe 4 on the outer wall of the upper cover plate 1 and then enter the liquid inlet tank 50 of the reaction pipe on the inner wall of the upper cover plate 1 and the lower cover plate 2 through multiple feed ports on the feed pipe 4. During the flow in the liquid inlet tank 50, the raw materials will continuously come into contact with the spiral disturbance plates 52 fixed on the inner wall of the tank. Since the spiral disturbance plates 52 in the liquid inlet tank 50 are distributed in an interlaced and mutually perpendicular manner, the raw materials will be cut, diverted and form a preliminary vortex when flowing through the disturbance plates. This not only achieves the preliminary mixing of multi-component raw materials, but also disperses any agglomerated particles that may exist in the raw materials.

[0020] When the initially mixed raw materials enter the spherical mixing chamber 51, the sudden change in flow pattern and space as the raw materials enter the spherical chamber from the tubular inlet 50 directly triggers strong vortices. These vortices cause the raw materials of different components to form irregular swirling flows within the chamber, allowing for further premixing of the various raw materials. The premixed raw materials are then distributed to multiple spherical distribution chambers 53 via connecting channels. Similarly, due to the change in channel shape, local vortices are formed at the inlet of the distribution chambers 53. These vortices allow the raw materials to spread and increase in size within the distribution chambers 53. The increased contact area of ​​the cavity walls can extend the residence time of the raw materials within the cavity, ensuring that the staged chemical reactions proceed fully. After the reactions in each of the branching cavities 53 are completed, the materials flow into the spherical confluence cavity 54 through the connecting pipe. The impact of multiple materials combined with the structural characteristics of the spherical cavity will trigger eddies again, quickly breaking the material stratification and achieving further fusion of materials in different branching cavities 53. The fused materials enter the drain tank 55, where they are further mixed and reacted under the secondary disturbance of the spiral disturbance plate 52. Then, they enter the next set of reaction pipelines to repeat the above process.

[0021] After the material completes the multi-stage continuous reaction in all the reaction pipes, it will eventually converge into the discharge pipe 3 on the outer wall of the upper cover plate 1. The internal thread on the inner wall of the discharge pipe 3 is adapted to the connection thread of the conventional chemical conveying pipe, which can facilitate the sealed connection with external collection equipment or subsequent processing devices. This can not only avoid leakage and pollution of materials during the discharge stage, but also ensure the smoothness of the discharge process. Thus, the entire chemical raw material conversion and discharge operation is completed.

[0022] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A microchannel reactor for chemical production, characterized in that, include: The upper cover plate (1), the lower cover plate (2), the feed pipe (4), the discharge pipe (3) and the reaction pipeline (5) are fixedly connected by symmetrically arranged side ears on the outer wall. The inner walls of the upper cover plate (1) and the lower cover plate (2) are provided with reaction pipes that constitute the reaction pipeline (5). The reaction pipeline includes an inlet tank (50), a mixing chamber (51), multiple branch chambers (53), a confluence chamber (54), and a drain tank (55). One end of the inlet tank (50) is connected to the mixing chamber (51). The mixing chamber (51) is connected to the multiple branch chambers (53) through a connecting groove. The end of the branch chamber (53) away from the mixing chamber (51) is connected to the confluence chamber (54) through a connecting pipe. One end of the confluence chamber (54) is connected to the drain tank (55). The drain tank (55) is connected to the inlet tank (50) in the next set of reaction pipelines. The inner walls of the inlet tank (50) and the drain tank (55) are both fixedly connected with spiral disturbance plates (52).

2. The microchannel reactor for chemical production according to claim 1, characterized in that: The upper cover plate (1) is fixedly connected to the feed pipe (4) and the discharge pipe (3), and the feed pipe (4) is connected to multiple feed ports.

3. A microchannel reactor for chemical production according to claim 1, characterized in that: The mixing chamber (51), the diversion chamber (53) and the confluence chamber (54) are all spherical chambers. The number of side ears on the outer walls of the upper cover plate (1) and the lower cover plate (2) is at least two sets, and through holes for fasteners are provided on the side ears to achieve a detachable fixed connection between the upper cover plate (1) and the lower cover plate (2).

4. A microchannel reactor for chemical production according to claim 1, characterized in that: The spiral disturbance plates (52) on the inner walls of the liquid inlet tank (50) and the liquid outlet tank (55) are staggered and perpendicular to each other.

5. A microchannel reactor for chemical production according to claim 1, characterized in that: The inner wall of the discharge pipe (3) is provided with an internal thread, the pitch of which is adapted to the connecting thread of a conventional chemical conveying pipeline, so as to facilitate sealed connection with external chemical production equipment.

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