Tubular ultrasonic microchannel reactor
By introducing internal mixing elements and ultrasonic generator probes into the microchannel reactor, combined with energy management of hot and cold media, the applicability of trace solids and flow deterioration reaction systems is solved, the reaction selectivity and production capacity are improved, and the reaction is reduced. by-products and clogging risks.
Patent Information
- Application Number
- CN202420542471.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-20
AI Technical Summary
When existing microchannel reactors treat reaction systems containing trace solids or reactants with deteriorated flow, their scope of application is limited, and the complex structure leads to an increase in pressure drop, which requires high material requirements, making it difficult to adapt to the raw materials containing trace solids or reactions. Reaction system of trace solids.
A tube ultrasonic microchannel reactor was designed, using internal mixing elements and ultrasonic generator probes to quickly add and remove energy through hot and cold media, improve reaction selectivity, and use ultrasound to enhance solid dispersion and fluid during the reaction process. Mixed effect.
This design is not only suitable for reaction systems containing trace solids or deteriorated flow, but also improves the selectivity and production capacity of the reaction, reduces by-products and blockage problems, and enhances the reaction speed and product quality.
Smart Images
Figure CN222267087U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical equipment, and specifically relates to a tubular ultrasonic microchannel reactor. Background Art
[0002] Compared with traditional tubular reactors, microchannel reactors have higher mixing, mass transfer and heat transfer effects, greatly improving the selectivity and safety of chemical reactions. Therefore, microchannel reactors are now the top priority of research and development. Currently, various types of microchannel reactors on the market have greatly improved in structure and performance, but the scope of application of microchannel reactors is relatively narrow, and the complex structure brings a large pressure drop, which also increases the requirements for the material of microchannel reactors.
[0003] Current microchannel reactors can be roughly divided into two categories: one is a tube without internal mixing elements, and the other is a tube with internal mixing elements like a static mixer. However, no matter which form of microchannel reactor is used, the channel through which the material flows is relatively small, so it is not suitable for reaction systems in which the raw materials contain trace solids or the reaction produces trace solids. In addition, if the viscosity of the reactants increases and the fluidity deteriorates, the reaction system is also difficult to be applied to current microchannel reactors.
[0004] Therefore, technicians in this field urgently need to develop a microchannel reactor suitable for reaction systems containing trace solids or with poor flow of reactants. Utility Model Content
[0005] In view of the above problems, the utility model provides a tubular ultrasonic microchannel reactor, which can not only solve the reaction system containing trace solids or reactants with poor flow, but also use internal mixing elements to achieve rapid addition and removal of system energy, greatly improving the selectivity of the reaction.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A tubular ultrasonic microchannel reactor comprises a first reaction structure section, at least one main reaction structure section and an outlet structure section, wherein at least one main reaction structure section is sequentially connected in series through a connecting channel, the outlet of the first reaction structure section is connected to the inlet of the first main reaction structure section, and the outlet structure section is connected to the outlet of the last main reaction structure section; the main reaction structure section comprises a main reaction tube, a mixing unit is arranged in the inner cavity of the main reaction tube, the mixing unit is a hollow structure, the maximum outer diameter of the mixing unit is smaller than the inner diameter of the main reaction tube, a cold and hot medium inlet pipe is penetrated on the upper tube wall of the first main reaction tube near one end of the first reaction structure section, a cold and hot medium outlet pipe is penetrated on the lower tube wall of the last main reaction tube near one end of the outlet structure section, the cold and hot medium inlet pipe is communicated with the inlet of the mixing unit in the first main reaction tube, the cold and hot medium outlet pipe is communicated with the outlet of the mixing unit in the last main reaction tube, and the mixing units in at least one main reaction structure section are connected in series through a connecting pipe, and the connecting pipe penetrates two adjacent main reaction tubes.
[0008] Furthermore, the mixing unit comprises a plurality of mixing elements with hollow structures which are sequentially connected in series, and the shape of the mixing element is one or more of a "heart" shape, a triangle or a diamond shape.
[0009] Furthermore, the connecting channel is a U-shaped tube.
[0010] Furthermore, the first reaction structure section is a Y-shaped structure, including a first feed channel, a second feed channel and a premixing zone, the first feed channel and the second feed channel are arranged at an acute angle, and the outlet of the premixing zone is connected to the inlet of the first main reaction tube.
[0011] Furthermore, the angle between the first feed channel and the second feed channel is 60°.
[0012] Furthermore, the first reaction structure section is a T-shaped structure, including a first feed channel, a second feed channel and a premixing zone, the angle between the first feed channel and the second feed channel is 180°, and the outlet of the premixing zone is connected to the inlet of the first main reaction tube.
[0013] Furthermore, the first reaction structure section is a sleeve-type structure, including a first feed channel, a second feed channel and a premixing zone, the second feed channel and the premixing zone are connected in a "┌" shape, and the premixing zone is horizontally arranged, and the outlet of the premixing zone is connected to the inlet of the first main reaction tube; the outer diameter of the first feed channel is smaller than the inner diameter of the premixing zone, the outlet end of the first feed channel extends into the interior of the premixing zone, and the first feed channel and the premixing zone are arranged coaxially.
[0014] Furthermore, a plurality of ultrasonic generating probes are provided on the outer side wall of each main reaction tube, and the plurality of ultrasonic generating probes are arranged at intervals along the length direction of the tube wall, and are arranged in a mirror-symmetrical manner on the upper and lower tube walls of the main reaction tube.
[0015] The main reaction tube of the tubular ultrasonic microchannel reactor of the utility model is provided with an ultrasonic device outside, which can enhance the gas-liquid-solid mixing, mass transfer and dispersion effects in the reaction process. However, due to the lack of ultrasonic effect, there are many by-products and the production process is easy to be blocked. The ultrasonic effect of the utility model enhances the solid dispersion and the change of the fluid rheological index, and improves the fluid mixing and reaction selectivity.
[0016] The main reaction tube of the utility model is provided with mixing components for enhancing mixing, dispersion, mass transfer and heat transfer. These components can not only make the reactants mix more evenly, but the mixing components are also provided with cold and hot media, which can quickly add or remove energy from the reaction system, improve reaction selectivity and reaction speed, obtain higher product yield and quality, and increase the production capacity of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a front view of the tubular ultrasonic microchannel reactor described in Example 1;
[0018] Figure 2 is a schematic structural diagram of the mixing element described in Example 2;
[0019] Figure 3 This is a schematic diagram of the structure of the first reaction structure section described in Example 2;
[0020] Figure 4 is a schematic structural diagram of the mixing element described in Example 3;
[0021] Figure 5 This is a schematic diagram of the structure of the first reaction structure section described in Example 3;
[0022] Figure 6 It is a schematic diagram of the fluid flow in the main reaction tube of the utility model.
[0023] Among them, 1-first reaction structure section, 2-main reaction structure section, 3-export structure section, 4-U-shaped tube, 5-cold and hot medium inlet tube, 6-cold and hot medium outlet tube, 7-connecting tube, 8-ultrasonic generating probe, 11-first feed channel, 12-second feed channel, 13-premixing zone, 21-main reaction tube, 22-mixing element. DETAILED DESCRIPTION
[0024] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. Example
[0025] like Figure 1 and Figure 4 As shown, a tubular ultrasonic microchannel reactor comprises a first reaction structure section 1, at least one main reaction structure section 2 and an outlet structure section 3, at least one main reaction structure section 2 is sequentially connected in series through a connecting channel, the connecting channel is a U-shaped tube 4, the outlet of the first reaction structure section 1 is connected to the inlet of the first main reaction structure section 2, and the outlet structure section 3 is connected to the outlet of the last main reaction structure section 2; the main reaction structure section 2 comprises a main reaction tube 21, a mixing unit is arranged in the inner cavity of the main reaction tube 21, the mixing unit is a hollow structure, the maximum outer diameter of the mixing unit is smaller than the inner diameter of the main reaction tube 21, and the mixing unit is arranged on the upper end of the first main reaction tube 21 close to the first reaction structure section 1. A hot and cold medium inlet pipe 5 is penetrated through the tube wall, and a hot and cold medium outlet pipe 6 is penetrated through the lower tube wall of the last main reaction tube 21 near the outlet structural section 3. The hot and cold medium inlet pipe 5 is connected to the inlet of the mixing unit in the first main reaction tube 21, and the hot and cold medium outlet pipe 6 is connected to the outlet of the mixing unit in the last main reaction tube 21. The mixing units in at least one main reaction structural section 2 are connected in series through a connecting pipe 7, and the connecting pipe 7 is penetrated through two adjacent main reaction tubes 21; a plurality of ultrasonic generating probes 8 are provided on the outer side wall of each of the main reaction tubes 21, and the plurality of ultrasonic generating probes 8 are arranged at intervals along the length direction of the tube wall, and are arranged mirror-symmetrically on the upper and lower tube walls of the main reaction tube 21.
[0026] The mixing unit comprises a plurality of mixing elements 22 of a hollow structure connected in series in sequence, and the shape of the mixing element 22 is a "heart" shape; the first reaction structure section 1 is a Y-shaped structure, comprising a first feed channel 11, a second feed channel 12 and a premixing zone 13, the first feed channel 11 and the second feed channel 12 are arranged at an acute angle, the outlet of the premixing zone 13 is connected to the inlet of the first main reaction tube 21, and the angle between the first feed channel 11 and the second feed channel 12 is 60°.
[0027] The two reaction materials of this embodiment enter the premixing zone through the first and second feed channels for sufficient mixing, and then enter the main reaction tube 21 for mixing and dispersion in the mixing element 22 and ultrasonic action to enhance mass transfer in the reaction zone, and energy is added or removed through the cold and hot media of the mixing element 22 to ensure the reaction temperature; in addition, ultrasound can also enhance the dispersion of solid materials and prevent blockage of materials during the reaction process; if the reaction time cannot be reached in one main reaction tube 21, multiple main reaction tubes 21 can be connected in series, and finally, the reaction materials are discharged from the discharge port.
[0028] The above device uses calcium hydroxide solution and CO 2Preparation of pharmaceutical-grade nano-calcium carbonate by gas: The prepared food-grade calcium hydroxide solution (mass percentage concentration of 6%) enters from the first feed channel 11 at a flow rate of 50 L / h, CO 2 (mass percentage 99.99%) flows into the second feed channel 12 at a flow rate of 4 L / min. The two streams of materials are fully mixed in the premixing zone 13 and then enter the main reaction tube 21. In the main reaction tube 21, the ultrasonic intensity is adjusted and the reaction temperature is controlled to 40°C through the cold and hot medium inlet pipes and the cold and hot medium inlet pipes. After the reaction, the pH is close to neutral, the reaction is basically completed, and medical grade nano calcium carbonate between 70 and 100 nm is obtained. In addition, the concentration of calcium hydroxide solution and the feed flow rate, CO 2 Medical grade nano calcium carbonate of different specifications can be prepared by adjusting feed flow rate, reaction temperature and ultrasonic intensity. Example
[0029] like Figure 2 and Figure 4 As shown, the difference between this embodiment and embodiment 1 is that the mixing element 22 of this embodiment is in the shape of a triangle, the first reaction structure section 1 is a T-shaped structure, including a first feed channel 11, a second feed channel 12 and a premixing zone 13, the angle between the first feed channel 11 and the second feed channel 12 is 180°, and the outlet of the premixing zone 13 is connected to the inlet of the first main reaction tube 21.
[0030] The above device uses calcium hydroxide solution and CO 2 Preparation of pharmaceutical-grade nano-calcium carbonate by gas: The prepared food-grade calcium hydroxide solution (mass percentage concentration of 2%) enters from the first feed channel 11 at a flow rate of 30 L / h, CO 2 (mass percentage 99.99%) flows into the second feed channel 12 at a flow rate of 2 L / min, and the two streams of materials are fully mixed in the premixing zone 13 and then enter the main reaction tube 21. In the main reaction tube 21, the ultrasonic intensity is adjusted and the reaction temperature is controlled to 45°C through the cold and hot medium inlet pipes and the cold and hot medium inlet pipes. After the reaction, the pH is close to neutral, the reaction is basically completed, and medical grade nano calcium carbonate between 100 and 130 nm is obtained. Example
[0031] like Figure 3As shown, the difference between this embodiment and embodiment 1 is that the mixing element 22 of this embodiment is in the shape of a rhombus; the first reaction structure section 1 is a sleeve-type structure, including a first feed channel 11, a second feed channel 12 and a premixing zone 13, the second feed channel 12 and the premixing zone 13 are connected in a "┌" shape, and the premixing zone 13 is arranged horizontally, and the outlet of the premixing zone 13 is connected to the inlet of the first main reaction tube 21; the outer diameter of the first feed channel 11 is smaller than the inner diameter of the premixing zone 13, the outlet end of the first feed channel 11 extends into the interior of the premixing zone 13, and the first feed channel 11 and the premixing zone 13 are arranged coaxially.
[0032] The above device uses calcium hydroxide solution and CO 2 Preparation of pharmaceutical-grade nano-calcium carbonate by gas: The prepared food-grade calcium hydroxide solution (mass percentage concentration of 2%) enters from the first feed channel 11 at a flow rate of 30 L / h, CO 2 (mass percentage 99.99%) flows into the second feed channel 12 at a flow rate of 2 L / min, and the two streams of materials are fully mixed in the premixing zone 13 and then enter the main reaction tube 21. In the main reaction tube 21, the ultrasonic intensity is adjusted and the reaction temperature is controlled to 45°C through the cold and hot medium inlet pipes and the cold and hot medium inlet pipes. After the reaction, the pH is close to neutral, the reaction is basically completed, and medical grade nano calcium carbonate between 100 and 130 nm is obtained.
[0033] A person skilled in the art should understand that the above description is only a specific 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 tubular ultrasonic microchannel reactor, characterized in that: The invention comprises a first reaction structure section, at least one main reaction structure section and an outlet structure section, wherein at least one main reaction structure section is connected in series in sequence through a connecting channel, the outlet of the first reaction structure section is connected to the inlet of the first main reaction structure section, and the outlet structure section is connected to the outlet of the last main reaction structure section; the main reaction structure section comprises a main reaction tube, a mixing unit is arranged in the inner cavity of the main reaction tube, the mixing unit is a hollow structure, the maximum outer diameter of the mixing unit is smaller than the inner diameter of the main reaction tube, a cold and hot medium inlet pipe is penetrated on the upper tube wall of the first main reaction tube near one end of the first reaction structure section, a cold and hot medium outlet pipe is penetrated on the lower tube wall of the last main reaction tube near one end of the outlet structure section, the cold and hot medium inlet pipe is communicated with the inlet of the mixing unit in the first main reaction tube, the cold and hot medium outlet pipe is communicated with the outlet of the mixing unit in the last main reaction tube, and the mixing units in at least one main reaction structure section are connected in series through a connecting pipe, and the connecting pipe penetrates two adjacent main reaction tubes.
2. A tubular ultrasonic microchannel reactor according to claim 1, characterized in that: The mixing unit comprises a plurality of mixing elements of a hollow structure connected in series, and the shape of the mixing element is one or more of a "heart" shape, a triangle or a diamond shape.
3. A tubular ultrasonic microchannel reactor according to claim 1, characterized in that: The connecting channel is a U-shaped tube.
4. A tubular ultrasonic microchannel reactor according to claim 1, characterized in that: The first reaction structure section is a Y-shaped structure, including a first feed channel, a second feed channel and a premixing zone, the first feed channel and the second feed channel are arranged at an acute angle, and the outlet of the premixing zone is connected to the inlet of the first main reaction tube.
5. A tubular ultrasonic microchannel reactor according to claim 4, characterized in that: The angle between the first feed channel and the second feed channel is 60°.
6. A tubular ultrasonic microchannel reactor according to claim 1, characterized in that: The first reaction structure section is a T-shaped structure, including a first feed channel, a second feed channel and a premixing zone, the angle between the first feed channel and the second feed channel is 180°, and the outlet of the premixing zone is connected to the inlet of the first main reaction tube.
7. A tubular ultrasonic microchannel reactor according to claim 1, characterized in that: The first reaction structure section is a sleeve-type structure, including a first feed channel, a second feed channel and a premixing zone, the second feed channel and the premixing zone are connected in a "┌" shape, and the premixing zone is arranged horizontally, and the outlet of the premixing zone is connected to the inlet of the first main reaction tube; the outer diameter of the first feed channel is smaller than the inner diameter of the premixing zone, the outlet end of the first feed channel extends into the interior of the premixing zone, and the first feed channel and the premixing zone are arranged coaxially.
8. A tubular ultrasonic microchannel reactor according to claim 1, characterized in that: A plurality of ultrasonic generating probes are arranged on the outer side wall of each main reaction tube. The plurality of ultrasonic generating probes are arranged at intervals along the length direction of the tube wall and are arranged in mirror symmetry on the upper and lower tube walls of the main reaction tube.