Micro-pipeline reactor
By designing a helical structure and a constricted and expanded structure in a micropipe reactor, the problem of low yield of solid phase participation in the reaction is solved, and the yield of ethyl acetate production is improved.
Patent Information
- Application Number
- CN202420855637.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-24
AI Technical Summary
Existing microchannel reactors are difficult to ensure the yield of solid phase participation in reactions, especially in the production of ethyl acetate, where the participation of solid phase of ferric chloride leads to a lower yield.
A spiral micropipe reactor is designed, with several convex and expansion structures arranged along its flow direction. Through these structures, the turbulence effect of the liquid and the mixing interface are increased, and the full contact and reaction between solid-phase materials and fluid is promoted.
By increasing the turbulence effect of the liquid and the mixing interface, the micropipe reactor improves the yield in ethyl acetate production, which is 5%-8% higher than the existing microchannel reactors on the market.
Smart Images
Figure CN222624503U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of micro-channel reactors, in particular to a micro-channel reactor for producing ethyl acetate. Background Art
[0002] At present, the modern chemical industry generally adopts the traditional method of large chemical industry for production, and there are inevitable problems such as large equipment investment, slow return, huge personnel input, cumbersome later maintenance, low yield and selectivity. In order to meet the requirements of modern enterprises for high yield, high selectivity, convenient maintenance, shortened reaction time and construction period, microchannel reactors have appeared, but microchannel reactors on the market are generally commonly used in liquid phase reactions, which are not suitable for solid phase participation reactions, greatly reducing the scope of application of microchannel reactors. For example, in the production process of ethyl acetate, iron trichloride solid phase is required to participate in the reaction, and the existing microchannel reactor is difficult to guarantee its yield, and the yield is low. Therefore, it is necessary to improve the existing process to be suitable for solid phase materials to participate in the reaction. Utility Model Content
[0003] The purpose of the utility model is to provide a micro-channel reactor to solve the problems raised in the above background technology.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A micro-channel reactor comprises a spiral micro-channel, wherein the micro-channel is provided with a plurality of sudden contraction and expansion structures along the flow direction thereof.
[0006] The sudden contraction and expansion structure is an annular protrusion structure arranged in the micro-channel.
[0007] The micro-pipe is formed by connecting a plurality of spiral pipe segments, and adjacent spiral pipe segments are connected by quick connectors.
[0008] The spiral tube segment is a waisted structure, forming a sudden contraction and expansion structure at the waist of the spiral tube segment.
[0009] The two ends of the spiral tube are interface structures with one end having a large diameter and the other end having a small diameter, and adjacent spiral tube sections are connected alternately in sequence by connecting the large end to the large end and the small end to the small end.
[0010] The utility model forms a sudden contraction and expansion structure in a spiral micro-channel, so that the longitudinal secondary mixing flow of the fluid mixed with the solid-phase material in the spiral tube increases the turbulence effect of the liquid, changes the movement trajectory of the fluid in the tube, increases the interface surface area of the fluid mixing, and increases the mixing effect, so that the two materials are fully in contact and react quickly. Compared with the existing microchannel reactors on the market for producing ethyl acetate, the yield is increased by 5%-8%. The utility model has the characteristics of simple structure, strong practicality, and good use effect, and is worthy of wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a process flow chart of an embodiment of the utility model;
[0012] Figure 2 This is a schematic diagram of the structure of the first embodiment of the utility model;
[0013] Figure 3 This is a schematic diagram of the structure of the second embodiment of the present utility model. DETAILED DESCRIPTION
[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0015] Embodiment 1
[0016] See also Figure 1-2 A microchannel reaction device for production includes a mixer, a centrifugal pump, a preheater and a microchannel reactor connected in sequence. The microchannel reactor includes a spiral microchannel 1. The microchannel is provided with a plurality of sudden contraction and expansion structures along its flow direction. In this embodiment, the sudden contraction and expansion structure in the microchannel is formed by an annular protrusion 1-1 with a conical cross-section in the channel 1.
[0017] The mixer fully mixes ethanol, acetic acid and catalyst, the centrifugal pump provides the power required by the reaction device, controls and promotes the flow of fluid, and the preheater raises the material temperature to a temperature close to the reaction temperature.
[0018] The working process is as follows: ethanol, acetic acid and catalyst ferric chloride are fully mixed in a mixer to obtain a suspension, which enters the preheater through a centrifugal pump and is preheated to a temperature required for the reaction; the mixed components enter the spiral microchannel reactor through the preheater, and under the action of a regular contraction and expansion structure, the mixed components flow in the microchannel structure while being fully mixed, and the material components are fully reacted by controlling the temperature and reaction time of the microchannel reactor to obtain a crude ethyl acetate product.
[0019] Embodiment 2
[0020] See also Figure 3 , Figure 3 It is a schematic diagram of the split structure of the spiral micro-channel 1 after it is unfolded in this embodiment.
[0021] The difference between this embodiment and the first embodiment is that: the micro-pipe 1 is formed by connecting a plurality of spiral pipe segments 1-2, and adjacent spiral pipe segments 1-2 are connected by quick connectors 1-3, which is convenient for assembly, replacement and adjustment. The spiral pipe segment 1-2 is a waisted structure, and a sudden contraction and expansion structure is formed at the waist of the spiral pipe segment 1-2, so that when the fluid mixed with solid-phase materials passes through the waist of the spiral pipe segment 1-2, the movement trajectory of the fluid in the pipe is changed, radial secondary mixing is formed, turbulence effect is formed, the interfacial surface area of fluid mixing is increased, the mixing effect is increased, and the two materials are fully in contact and react quickly.
[0022] Preferably, both ends of the spiral tube 1-2 are interface structures with one end having a large diameter and the other end having a small diameter, and adjacent spiral tube sections 1-2 are connected alternately in sequence by connecting large end to large end and small end to small end, so that the fluid forms different spatial changes when passing through different sudden contraction and expansion structures, further increasing the mixing effect and allowing the two materials to fully contact and react quickly.
[0023] Through experiments, ethyl acetate is produced by the following method: adding ferric chloride catalyst to ethanol to make the mass content of the catalyst 3.12%, fully mixing with acetic acid solution to obtain a suspension, passing it into a microchannel reactor at a flow rate of 8L / min, controlling the temperature of the microchannel reactor to 80°C, reacting for 80 minutes, and collecting the product at the outlet of the microchannel reactor through a sampler. The microchannel reactor of the utility model is used to produce ethyl acetate, and the yield is increased by 5.8% compared with the existing microchannel reactor on the market.
[0024] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A microchannel reactor, characterized in that: It comprises a spiral micro-channel, wherein the micro-channel is provided with a plurality of sudden contraction and sudden expansion structures along the flow direction thereof, wherein the sudden contraction and sudden expansion structures are annular protrusion structures arranged in the micro-channel.
2. The microchannel reactor according to claim 1, characterized in that: The micro-pipe is formed by connecting a plurality of spiral pipe segments, and adjacent spiral pipe segments are connected by quick connectors.
3. The microchannel reactor according to claim 2, characterized in that: The spiral tube segment is a waisted structure, and a sudden contraction and expansion structure is formed at the waist of the spiral tube segment.
4. The microchannel reactor according to claim 2, characterized in that: The two ends of the spiral tube are interface structures with one end having a large diameter and the other end having a small diameter, and adjacent spiral tube sections are connected alternately in sequence by connecting the large end to the large end and the small end to the small end.