Micro-channel reactor for realizing continuous hydrothermal reaction

Abstract

The invention discloses a micro-channel reactor for realizing continuous hydrothermal reaction, which comprises a first tubular heat exchanger, a second tubular heat exchanger, a mixer, a first micro-channel reactor, a third tubular heat exchanger and a second micro-channel reactor, the first tubular heat exchanger and the second tubular heat exchanger are both arranged on the same side of the mixer; the output end of the third tubular heat exchanger is connected with the input end of the second microchannel reactor, and the output end of the second microchannel reactor is provided with a first gas-liquid separation tank and a second gas-liquid separation tank. The gas-liquid separation device is provided with the first gas-liquid separation tank and the second gas-liquid separation tank respectively, gas-liquid separation of products is achieved through the design, the requirement for continuous production is met, the two gas-liquid separation tanks can be used alternately, and when one gas-liquid separation tank is used for gas-liquid separation, the gas-liquid separation tank can be used for gas-liquid separation. And the other gas-liquid separation tank can be prepared to receive a new reaction product, so that the continuity and high efficiency of production are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of nano material preparation, in particular to a microchannel reactor for realizing continuous hydrothermal reaction. Background Art

[0002] Microchannel reactors utilize microchannel technology to enable reactants to flow continuously within microchannels. By precisely controlling parameters such as reaction temperature, pressure, and concentration, they achieve efficient, rapid, and controllable chemical reactions. In hydrothermal reactions, microchannel reactors ensure that reactants react under constant and uniform temperature and pressure conditions, thereby improving reaction efficiency and product quality.

[0003] When existing microchannel reactors process reactants, gas-liquid separation is one of the important steps in chemical reaction post-processing. Its purpose is to separate the gas and liquid in the reaction products to obtain pure products. In the continuous production process, the reaction products need to be continuously output from the reactor and subsequently processed.

[0004] For example, a microchannel reactor disclosed in the announcement number CN211754876U has only one gas-liquid separation tank, which means that while processing one batch of products, the next batch of products cannot be received and processed, which will lead to a decrease in production efficiency because the processing of the next batch can only start after the current batch is completed. In some cases, when the output rate of the reactor is higher than the processing capacity of the gas-liquid separation tank, the gas-liquid separation tank will become the bottleneck of the production line. At this time, even if the reactor and other equipment are running at full load, the insufficient processing capacity of the gas-liquid separation tank will limit the overall production efficiency, and the failure will cause production interruption.

[0005] Therefore, it is necessary to invent a microchannel reactor for realizing continuous hydrothermal reaction to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a microchannel reactor for realizing continuous hydrothermal reaction, so as to solve the problem in the technology that while processing one batch of products, the next batch of products cannot be received and processed, which leads to reduced production efficiency.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solution: A microchannel reactor for realizing continuous hydrothermal reaction, comprising a No. 1 tubular heat exchanger, a No. 2 tubular heat exchanger, a mixer, a No. 1 microchannel reactor, a No. 3 tubular heat exchanger and a No. 2 microchannel reactor, wherein the No. 1 tubular heat exchanger and the No. 2 tubular heat exchanger are both arranged on the same side of the mixer, the output ends of the No. 1 tubular heat exchanger and the No. 2 tubular heat exchanger are both connected to the input end of the mixer, a mixing mechanism is provided inside the mixer, the No. 1 microchannel reactor is arranged on the other side of the mixer, the input end of the No. 1 microchannel reactor is connected to the output end of the mixer, a No. 3 tubular heat exchanger is provided on one side of the No. 1 microchannel reactor, a No. 2 microchannel reactor is provided on one side of the No. 3 tubular heat exchanger, the output end of the No. 3 tubular heat exchanger is connected to the input end of the No. 2 microchannel reactor, and the output end of the No. 2 microchannel reactor is respectively provided with a No. 1 gas-liquid separation tank and a No. 2 gas-liquid separation tank.

[0008] Preferably, spiral preheating tubes are provided inside the No. 1 tubular heat exchanger and the No. 2 tubular heat exchanger, and the spiral preheating tubes improve the heat exchange efficiency.

[0009] Preferably, the mixer comprises a mixing tank and a sealing cover, and the sealing cover is seamlessly engaged with the top of the mixing tank via a sealing strip to ensure the sealing of the reaction environment inside the mixer and prevent leakage of reactants or entry of external impurities.

[0010] Preferably, the mixing mechanism includes a servo motor, a stirring rod and a stirring blade. The servo motor is located at the top of the sealing cover. The output shaft of the servo motor is connected to the stirring rod. The stirring blade is installed on the stirring rod to achieve uniform mixing of the reactants inside the mixer.

[0011] Preferably, a disassembly structure is provided between the output shaft of the servo motor and the stirring rod, and the disassembly structure includes a mounting sleeve, the inner wall of the mounting sleeve is provided with an internal thread, and the outer wall of the top end of the stirring rod is provided with an external thread. The internal thread and the external thread cooperate with each other to facilitate the disassembly and maintenance of the stirring rod.

[0012] Preferably, the disassembly and assembly structure also includes a No. 1 screw rod, which passes through the mounting sleeve and the stirring rod and extends to the outside thereof. A No. 1 screw hole is provided at the contact position between the No. 1 screw rod, the mounting sleeve and the stirring rod. A No. 1 nut is threadedly installed on the No. 1 screw rod. By rotating the No. 1 nut, the stirring rod can be easily removed from the output shaft of the servo motor, which is convenient for cleaning, replacement or repair of the stirring rod and the stirring blades thereon.

[0013] Preferably, three sleeves are provided on the stirring rod, and the outer walls of the three sleeves are penetrated by a No. 2 screw rod and extended to the outside thereof. A No. 2 screw hole is provided at the contact position between the No. 2 screw rod and the sleeve and the stirring rod, and a No. 2 nut is threadedly installed on the No. 2 screw rod to increase the flexibility and applicability of the stirring rod.

[0014] Preferably, the output end of the No. 1 microchannel reactor is connected to the input end of the No. 3 tubular heat exchanger through a connecting pipe, and a back pressure valve is provided on the connecting pipe to control the pressure of the reactants when they flow out of the microchannel reactor to prevent the reactants from boiling due to too low pressure or damage to subsequent equipment due to too high pressure.

[0015] Preferably, the third tubular heat exchanger is provided with a spiral pre-cooling tube, which improves the cooling efficiency.

[0016] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0017] 1. The present invention achieves uniform mixing of reactants by using a mixing mechanism disposed within the mixer, with the servo motor driving the stirring rod and stirring blades to rotate. This design ensures sufficient contact between the reactants, improves reaction efficiency and product purity, and a disassembly structure disposed between the output shaft of the servo motor and the stirring rod makes disassembly of the stirring rod simple and quick, facilitating cleaning, replacement, or maintenance of the stirring rod. Furthermore, the stirring rod and stirring blades are connected by a No. 2 screw and No. 2 nut, which also facilitates disassembly and assembly, thereby facilitating cleaning, replacement, or maintenance of the stirring blades.

[0018] 2. The present invention incorporates a back-pressure valve installed on the connecting pipe between the output of the No. 1 microchannel reactor and the input of the No. 3 tubular heat exchanger. This design effectively controls the pressure of reactants flowing out of the microchannel reactor, preventing boiling of reactants due to low pressure or damage to subsequent equipment caused by excessive pressure, thereby ensuring a smooth reaction process.

[0019] 3. The present invention is respectively provided with a No. 1 gas-liquid separation tank and a No. 2 gas-liquid separation tank. This design not only realizes the gas-liquid separation of the product, but also meets the needs of continuous production. The two gas-liquid separation tanks can be used in rotation. When one gas-liquid separation tank is performing gas-liquid separation, the other gas-liquid separation tank can be ready to receive new reaction products, thereby ensuring the continuity and efficiency of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall process structure of the present invention;

[0021] Figure 2 Schematic diagram of the three-dimensional structure of the mixer of the present invention

[0022] Figure 3 This is a front structural schematic diagram of a mixing tank according to the present invention;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the stirring blade of the present invention;

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the internal thread and the external thread of the present invention;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the No. 2 screw and No. 2 nut of the present invention.

[0026] Description of reference numerals:

[0027] 1. Tubular heat exchanger No. 1; 2. Tubular heat exchanger No. 2; 3. Mixer; 301. Mixing tank; 302. Sealing cover; 4. Mixing mechanism; 401. Servo motor; 402. Stirring rod; 403. Stirring blade; 5. Disassembly and assembly structure; 501. Mounting sleeve; 502. Internal thread; 503. External thread; 504. Screw No. 1; 505. Screw hole No. 1; 506. Nut No. 1; 6. Sleeve; 7. Screw No. 2; 8. Screw hole No. 2; 9. Nut No. 2; 10. Microchannel reactor No. 1; 11. Back pressure valve; 12. Tubular heat exchanger No. 3; 13. Microchannel reactor No. 2; 14. Gas-liquid separation tank No. 1; 15. Gas-liquid separation tank No. 2. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] The present invention provides Figure 1-6 The microchannel reactor shown in the figure is used to realize continuous hydrothermal reaction, including a No. 1 tubular heat exchanger 1, a No. 2 tubular heat exchanger 2, a mixer 3, a No. 1 microchannel reactor 10, a No. 3 tubular heat exchanger 12 and a No. 2 microchannel reactor 13. The No. 1 tubular heat exchanger 1 and the No. 2 tubular heat exchanger 2 are both arranged on the same side of the mixer 3. The output ends of the No. 1 tubular heat exchanger 1 and the No. 2 tubular heat exchanger 2 are connected to the input end of the mixer 3. The mixer 3 is provided with a mixing mechanism 4. The No. 1 microchannel reactor is connected to the mixer 3. The reactor 10 is arranged on the other side of the mixer 3, the input end of the No. 1 microchannel reactor 10 is connected to the output end of the mixer 3, a No. 3 tubular heat exchanger 12 is arranged on one side of the No. 1 microchannel reactor 10, a No. 2 microchannel reactor 13 is arranged on one side of the No. 3 tubular heat exchanger 12, the output end of the No. 3 tubular heat exchanger 12 is connected to the input end of the No. 2 microchannel reactor 13, and the output end of the No. 2 microchannel reactor 13 is respectively provided with a No. 1 gas-liquid separation tank 14 and a No. 2 gas-liquid separation tank 15.

[0030] By setting up two gas-liquid separation tanks, gas-liquid separation tank No. 14 and gas-liquid separation tank No. 2 15, rapid and efficient separation of the products can be achieved, which helps to reduce the residence time of the products in the system, improve the overall processing efficiency, and ensure the continuity of the system.

[0031] Spiral preheating tubes are provided inside the No. 1 tubular heat exchanger 1 and the No. 2 tubular heat exchanger 2 .

[0032] Both the No. 1 tubular heat exchanger 1 and the No. 2 tubular heat exchanger 2 are equipped with spiral preheating tubes. This design increases the flow path length of the fluid in the No. 1 tubular heat exchanger 1 and the No. 2 tubular heat exchanger 2, thereby improving the heat exchange efficiency. The preheating tubes are used to preheat the material before entering the main reaction or processing step to ensure that the material reaches the appropriate reaction temperature, which helps to improve the reaction rate and product selectivity.

[0033] The mixer 3 includes a mixing tank 301 and a sealing cover 302. The sealing cover 302 is seamlessly engaged with the top of the mixing tank 301 through a sealing strip. The mixing mechanism 4 includes a servo motor 401, a stirring rod 402 and a stirring blade 403. The servo motor 401 is located at the top of the sealing cover 302. The output shaft of the servo motor 401 is connected to the stirring rod 402. The stirring blade 403 is installed on the stirring rod 402. A disassembly structure 5 is provided between the output shaft of the servo motor 401 and the stirring rod 402. The disassembly structure 5 includes a mounting sleeve 501. The inner wall of the mounting sleeve 501 is provided with an internal thread 502. The outer wall of the top of the stirring rod 402 is provided with an external thread 503. The internal thread 502 and the external thread 503 cooperate with each other, and the disassembly and assembly structure 5 also includes a No. 1 screw 504, which passes through the mounting sleeve 501 and the stirring rod 402 and extends to the outside thereof. A No. 1 screw hole 505 is provided at the contact position between the No. 1 screw 504 and the mounting sleeve 501 and the stirring rod 402. A No. 1 nut 506 is threadedly installed on the No. 1 screw 504, and three sleeves 6 are provided on the stirring rod 402. The outer walls of the three sleeves 6 are penetrated and connected with a No. 2 screw 7 and extend to the outside thereof. A No. 2 screw hole 8 is provided at the contact position between the No. 2 screw 7 and the sleeve 6 and the stirring rod 402, and a No. 2 nut 9 is threadedly installed on the No. 2 screw 7.

[0034] The mixer 3 is used to mix different materials evenly, providing a uniform material basis for subsequent chemical reactions or processing steps. The sealing design of the mixing tank 301 and the sealing cover 302 prevents material leakage, ensuring the operating environment and personnel safety. Silicon carbide is added as a catalyst to the mixed material when it enters the No. 1 microchannel reactor 10, which can further reduce the activation energy of the reaction, thereby promoting the reaction and significantly improving the reaction rate. The disassembly structure 5 cooperates with the internal thread 502 of the mounting sleeve 501 and the external thread 503 of the stirring rod 402, as well as the No. 1 screw 504 and the No. 1 nut 506 to achieve rapid disassembly and assembly of the stirring rod 402, and the outer wall of the sleeve 6 can also facilitate the disassembly and assembly of the stirring blade 403 through the No. 2 screw 7 and the No. 2 nut 9, thereby facilitating the maintenance and replacement of the stirring rod 402 and the stirring blade 403, thereby improving the flexibility and maintenance efficiency of the equipment.

[0035] The output end of the No. 1 microchannel reactor 10 is connected to the input end of the No. 3 tubular heat exchanger 12 through a connecting pipe, and a back pressure valve 11 is provided on the connecting pipe. The No. 3 tubular heat exchanger 12 is provided with a spiral pre-cooling pipe.

[0036] The microchannel reactor is used to carry out chemical reactions efficiently and accurately. The products enter the No. 3 tubular heat exchanger 12 through the connecting pipe for pre-cooling. The back pressure valve 11 is used to adjust the system pressure to ensure that the reaction and cooling processes are carried out under appropriate conditions. Pre-cooling helps the stability and efficiency of subsequent processing steps.

[0037] Working principle of the present invention:

[0038] Refer to the instruction manual Figure 1-6 When using the present invention, first prepare the materials that need to participate in the reaction, start the No. 1 tubular heat exchanger 1 and the No. 2 tubular heat exchanger 2, and use the internal spiral preheating tube to preheat the materials to ensure that the materials reach the appropriate reaction temperature before entering the main reaction step. The preheated materials are sent to the mixer 3 through the corresponding pipeline. In the mixer 3, the servo motor 401 is started, and the materials are evenly mixed by the stirring rod 402 and the stirring blade 403. Before the mixed materials are about to enter the No. 1 microchannel reactor 10, silicon carbide is added as a catalyst. In order to reduce the activation energy of the reaction and promote the reaction, the mixed materials with the catalyst are fed into the No. 1 microchannel reactor 10 for efficient and precise chemical reaction. After the reaction is completed, the product enters the No. 3 tubular heat exchanger 12 through the connecting pipe for pre-cooling. The spiral pre-cooling pipe in the No. 3 tubular heat exchanger 12 helps to improve the cooling efficiency. At the same time, the back pressure valve 11 is used to adjust the system pressure to ensure that the cooling process is carried out under appropriate conditions. The cooled product enters the No. 2 microchannel reactor 13 for thorough cooling and further chemical reaction to produce the desired final product.

[0039] Finally, it directly enters the No. 1 gas-liquid separation tank 14 or the No. 2 gas-liquid separation tank 15 for gas-liquid separation. The No. 1 gas-liquid separation tank 14 and the No. 2 gas-liquid separation tank 15 are used alternately. When the No. 1 gas-liquid separation tank 14 is performing gas-liquid separation, the No. 2 gas-liquid separation tank 15 is in standby state, ready to receive the next batch of products. Once the No. 1 gas-liquid separation tank 14 completes the separation task and is emptied, the No. 2 gas-liquid separation tank 15 will start to receive new products for separation. In the No. 1 gas-liquid separation tank 14 or the No. 2 gas-liquid separation tank 15, the gas and liquid will separate naturally. The gas will usually rise to the top of the tank and be discharged through the exhaust port, while the liquid will be deposited at the bottom of the tank and discharged through the drain port. The separated gas and liquid are collected in corresponding containers for subsequent processing or storage.

Claims

1. A microchannel reactor for realizing continuous hydrothermal reaction, comprising a first tubular heat exchanger (1), a second tubular heat exchanger (2), a mixer (3), a first microchannel reactor (10), a third tubular heat exchanger (12) and a second microchannel reactor (13), characterized in that: The first tubular heat exchanger (1) and the second tubular heat exchanger (2) are both arranged on the same side of the mixer (3); the output ends of the first tubular heat exchanger (1) and the second tubular heat exchanger (2) are both connected to the input end of the mixer (3); a mixing mechanism (4) is provided inside the mixer (3); the first microchannel reactor (10) is arranged on the other side of the mixer (3); the input end of the first microchannel reactor (10) is connected to the mixer (3); The output end of the No. 1 microchannel reactor (10) is connected to the output end thereof, a No. 3 tubular heat exchanger (12) is provided on one side of the No. 1 microchannel reactor (10), a No. 2 microchannel reactor (13) is provided on one side of the No. 3 tubular heat exchanger (12), the output end of the No. 3 tubular heat exchanger (12) is connected to the input end of the No. 2 microchannel reactor (13), and the output end of the No. 2 microchannel reactor (13) is respectively provided with a No. 1 gas-liquid separation tank (14) and a No. 2 gas-liquid separation tank (15).

2. A microchannel reactor for realizing continuous hydrothermal reaction according to claim 1, characterized in that: The first tubular heat exchanger (1) and the second tubular heat exchanger (2) are both provided with spiral preheating tubes inside.

3. A microchannel reactor for realizing continuous hydrothermal reaction according to claim 1, characterized in that: The mixer (3) comprises a mixing tank (301) and a sealing cover (302), wherein the sealing cover (302) is seamlessly engaged with the top of the mixing tank (301) via a sealing strip.

4. A microchannel reactor for realizing continuous hydrothermal reaction according to claim 1, characterized in that: The mixing mechanism (4) comprises a servo motor (401), a stirring rod (402) and a stirring blade (403); the servo motor (401) is located at the top end of the sealing cover (302); the output shaft of the servo motor (401) is connected to the stirring rod (402); and the stirring blade (403) is installed on the stirring rod (402).

5. A microchannel reactor for realizing continuous hydrothermal reaction according to claim 4, characterized in that: A disassembly structure (5) is provided between the output shaft of the servo motor (401) and the stirring rod (402), and the disassembly structure (5) includes a mounting sleeve (501), an inner wall of the mounting sleeve (501) is provided with an internal thread (502), and an outer wall of the top end of the stirring rod (402) is provided with an external thread (503), and the internal thread (502) and the external thread (503) are matched with each other.

6. A microchannel reactor for realizing continuous hydrothermal reaction according to claim 5, characterized in that: The disassembly and assembly structure (5) further comprises a No. 1 screw rod (504), which passes through the mounting sleeve (501) and the stirring rod (402) and extends to the outside thereof; a No. 1 screw hole (505) is provided at the contact position between the No. 1 screw rod (504), the mounting sleeve (501) and the stirring rod (402); and a No. 1 nut (506) is threadedly mounted on the No. 1 screw rod (504).

7. A microchannel reactor for realizing continuous hydrothermal reaction according to claim 6, characterized in that: Three sleeves (6) are provided on the stirring rod (402), and the outer walls of the three sleeves (6) are connected with a No. 2 screw (7) and extend to the outside thereof. A No. 2 screw hole (8) is provided at the contact position between the No. 2 screw (7) and the sleeve (6) and the stirring rod (402), and a No. 2 nut (9) is threadedly installed on the No. 2 screw (7).

8. The microchannel reactor for realizing continuous hydrothermal reaction according to claim 1, characterized in that: The output end of the No. 1 microchannel reactor (10) is connected to the input end of the No. 3 tubular heat exchanger (12) through a connecting pipe, and a back pressure valve (11) is provided on the connecting pipe.

9. A microchannel reactor for realizing continuous hydrothermal reaction according to claim 8, characterized in that: The third tubular heat exchanger (12) is provided with a spiral pre-cooling tube.

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