An apparatus and method for preparing nanobubble liquids by enhanced gas-liquid two-phase mixing.

Abstract

Gas-liquid two-phase mixtures are often difficult to mix fully due to poor compatibility, and the rapid separation of the two phases after mixing leads to a small unit contact area between the two phases, resulting in a reaction rate much lower than their intrinsic reaction rate. This invention uses a fluid pump to deliver gas and liquid two-phase fluids into the microcavity of a confined jet impact micromixer for instantaneous turbulent mixing. After the mixed fluid flows out of the cavity, it recirculates back into the micromixer cavity for confined jet impact mixing. During fluid mixing and subsequent processes, the gas phase is generated and exists in large quantities in the mixed liquid in the form of nanobubbles. The dispersibility, contact area, solubility, and reaction rate of the gas phase in the liquid phase are significantly improved, achieving enhanced gas-liquid two-phase mixing. The enhanced gas-liquid two-phase mixing (reaction) device provided by this invention can be used to synthesize isobutylene-maleic anhydride (ISOBAM) copolymers or to prepare carbon dioxide nanobubble liquids, etc.

Description

Technical Field

[0001] This invention relates to the field of gas-liquid mixing technology, and specifically to an apparatus and method for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing. Background Technology

[0002] Gas-liquid two-phase mixing (reaction) plays a crucial role in the chemical synthesis industry. However, gas and liquid phases are often difficult to mix fully due to poor compatibility, and the rapid separation of the two phases after mixing results in a small unit contact area between the two phases, leading to a reaction rate much lower than its intrinsic reaction rate. Furthermore, the decrease in apparent reaction rate is likely to lead to a decrease in reaction yield and reaction selectivity.

[0003] In traditional industrial production, gas-liquid bubbling and stirred-tank pressurization methods are often used to enhance gas-liquid mixing and reaction. Gas-liquid bubbling is simple to operate, but it is bulky, has short gas-liquid contact time, produces large bubbles, has low mixing efficiency, and lacks uniformity. Stirred-tank pressurization requires high pressure, posing significant safety risks, and the reaction mainly occurs at the gas-liquid interface, leading to uneven and incomplete mixing. Therefore, conventional methods cannot effectively solve the problems of uniform mixing between immiscible gas and liquid phases and improving the apparent reaction rate. Thus, there is an urgent need for a gas-liquid two-phase enhanced mixing (reaction) device and method for preparing nanobubble liquids. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing an apparatus for preparing nanobubble liquids through enhanced gas-liquid two-phase mixing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An apparatus for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing includes an inert gas storage tank G1, a gas phase raw material storage tank G2, a micromixer M, and a liquid phase raw material storage tank V. p1 Circulating mixing tank V p2 Anti-backflow tank V p3 Gas buffer storage tank V p4 Waste liquid tank V p5 Anti-backflow tank V p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 Liquid pump P1, gas pump P2, flow meter FM1, flow meter FM2, pressure gauge PI1, pressure gauge PI2, filter SR1, shut-off valve SV1, shut-off valve SV2, shut-off valve SV3, shut-off valve SV4, pneumatic valve GV1, pneumatic valve GV2, tee connector T1, tee connector T2, tee connector T3, tee connector T4, tee switch valve TV1, tee switch valve TV2;

[0007] The liquid phase raw material storage tank V p1 The system includes an inlet of a three-way switch valve TV1, a liquid phase pump P1, a three-way switch valve TV2, a flow meter FM2, a micro mixer M, and a circulating mixing tank V. p2 The filter SR1 and the other inlet of the three-way switch valve TV1 are connected in sequence by pipelines; the remaining outlet of the three-way switch valve TV2 and the waste liquid tank V p5 Pipe connection;

[0008] The gaseous raw material storage tank G2, pressure valve GV2, pressure gauge PI1, one inlet of tee connector T1, one inlet of tee connector T2, and gas buffer storage tank V are mentioned. p4 Pressure gauge PI2, shut-off valve SV4, tee connector T3, micro mixer M, circulating mixing tank V p2 Anti-backflow tank V p3 The gas phase pump P2, flow meter FM1, tee connector T4, shut-off valve SV1, and the other inlet of tee connector T1 are connected in sequence by pipelines; the other inlet of tee connector T2, pressure valve GV1, and inert gas storage tank G1 are connected in sequence by pipelines; the remaining outlet of tee connector T4, shut-off valve SV2, and anti-backflow tank V are connected in sequence by pipelines. p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 The circulating mixing tank V is connected by pipelines in sequence. p2 The remaining outlet is connected to the atmosphere.

[0009] To optimize the above technical solution, the specific measures also include:

[0010] Furthermore, the micromixer M includes at least a gas phase inlet, a liquid phase inlet, a fluid outlet, and a micromixing chamber.

[0011] Furthermore, the micromixer M includes at least one gas jet inlet and one liquid jet inlet.

[0012] Furthermore, the volume of the micro-mixing cavity is no greater than 1.0 mL to ensure that the gas and liquid phases are enhancedly mixed within the confined microspace.

[0013] Furthermore, the equivalent diameter d of the gas jet inlet g The equivalent diameter d of the micro-mixing chamber is no greater than 1.0 mm. c The equivalent diameter d of the liquid jet inlet is no greater than 10.0 mm. l Not less than 2d g and no greater than 2d c / 3, to ensure that the liquid is an absolutely continuous phase, and that the liquid enters the microcavity as a jet, which facilitates rapid and effective mixing with the fluid inside the cavity through shearing; the equivalent diameter d of the fluid outlet.o Not greater than d l This increases the pressure within the microcavity, effectively promoting uniformity of mixing; the angle θ between the gas jet direction and the liquid jet direction is not less than 30°, to ensure sufficient collision between the two fluid streams and effectively enhance mixing.

[0014] The present invention also provides a method for preparing nanobubble liquid based on the above-mentioned gas-liquid two-phase enhanced mixing device, comprising the following steps:

[0015] S1, in inert gas storage tank G1, gaseous feedstock storage tank G2, liquid feedstock storage tank V p1 Add sufficient raw materials, open the three-way valve TV1 to connect the filter SR1 and the liquid phase pump P1, open the three-way valve TV2 to connect the liquid phase pump P1 and the flow meter FM2, forming a circulation path between the liquid phase pump P1, the flow meter FM2 and the filter SR1, and all other pumps and valves are in the closed state.

[0016] S2, Vacuuming: Open shut-off valves SV2 and SV4 and gas phase pump P2 to evacuate the device, then close shut-off valves SV2 and gas phase pump P2; open pressure valve GV1, introduce inert gas, then close pressure valve GV1; repeat the above evacuation and filling process several times, then close shut-off valves SV2 and SV4 and gas phase pump P2.

[0017] S3. Feeding: Open the pressure valve GV2 to flush the gas in the gas phase raw material storage tank G2 into the gas buffer storage tank V. p4 Afterwards, close the air pressure valve GV2; adjust the three-way switch valve TV1 to connect the liquid phase raw material storage tank V. p1 With liquid phase pump P1 turned on, the liquid phase raw material storage tank V was opened. p1 The liquid is pumped into the circulating mixing tank V. p2 Then, switch the three-way valve TV1 back to connect the filter SR1 and the liquid pump P1. Keep the liquid pump P1 open to circulate the liquid circuit.

[0018] S4. Mixing (Reaction): Open shut-off valves SV1 and SV4 and gas pump P2 to circulate the gas path. The gas and liquid phases are mixed (reacted) in the micro mixer M. After the mixing (reaction) is completed, close liquid pump P1 and gas pump P2.

[0019] S5. Waste removal and product collection: Adjust the three-way valve TV2 to connect the liquid phase pump P1 and the waste liquid tank V. p5 Turn on the liquid phase pump P1 to open the circulating mixing tank V. p2 Waste liquid is pumped into waste liquid tank V p5Then, shut off the liquid phase pump P1, and switch the three-way valve TV2 back to connect the liquid phase pump P1 and the flow meter FM2; close the shut-off valve SV1, and open the shut-off valve SV2 and the gas phase pump P2 to pump the exhaust gas sequentially into the anti-backflow tank V. p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 Then close the shut-off valve SV2 and the gas phase pump P2; open the gas pressure valve GV1, introduce inert gas, and then close the gas pressure valve GV1; repeat the above gas filling and purging operation several times, then open the shut-off valve SV3 to release the circulating mixing tank V. p2 The mixed (reaction) products in the mixture are then removed, and the shut-off valve SV3 is closed.

[0020] S6. Cleaning: In the liquid phase raw material storage tank V p1 Replace the cleaning fluid and adjust the three-way valve TV1 to connect the liquid phase raw material storage tank V. p1 With liquid phase pump P1 turned on, the liquid phase pump P1 is used to pump the circulating mixing tank V. p2 Pump cleaning fluid into the pipeline, turn the three-way valve TV1 back to connect filter SR1 and liquid phase pump P1, keep liquid phase pump P1 open, circulate and clean, open shut-off valve SV3 to drain the cleaning fluid, and close shut-off valve SV3 and liquid phase pump P1. Repeat the above cleaning operation several times.

[0021] Furthermore, the volume solubility of the gaseous feedstock in the liquid phase is no more than 1%, and the gas-liquid mixture includes isobutylene gas, an ethyl acetate saturated solution of isobutylene gas, nitrogen, oxygen, carbon dioxide, air and combinations thereof with liquid water.

[0022] Furthermore, the sum of the Reynolds numbers at each jet inlet of the micro-mixer M is not less than 2000 to ensure instantaneous and sufficient turbulent mixing of the gas and liquid phases.

[0023] The beneficial effects of this invention are as follows: This invention integrates the process of the gas-liquid mixing device, realizing the integration and continuity of exhaust, feeding, mixing (reaction), product and waste collection; the added micro-mixer makes the integrated device lighter and more portable, and at the same time, it can prepare products under lower gas pressure conditions, making gas-liquid mixing (reaction) more efficient and uniform, and more energy-saving and safer; the structure of this invention promotes the uniformity of the mixing (reaction) of the micro-mixer, enabling it to continuously and rapidly enhance the mixing reaction effect of the gas and liquid phases. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the cavity structure of a confined jet flow micromixer;

[0026] Figure 3The diameter distribution of isobutylene nanobubbles prepared by a gas-liquid enhanced mixing device;

[0027] Figure 4 This is a comparison of the dispersion performance of the obtained isobutylene-maleic anhydride copolymer on Al2O3 particle slurry. Detailed Implementation

[0028] like Figure 1 As shown, an apparatus for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing includes an inert gas storage tank G1, a gas phase raw material storage tank G2, a micromixer M, and a liquid phase raw material storage tank V. p1 Circulating mixing tank V p2 Anti-backflow tank V p3 Gas buffer storage tank V p4 Waste liquid tank V p5 Anti-backflow tank V p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 Liquid pump P1, gas pump P2, flow meter FM1, flow meter FM2, pressure gauge PI1, pressure gauge PI2, filter SR1, shut-off valve SV1, shut-off valve SV2, shut-off valve SV3, shut-off valve SV4, pneumatic valve GV1, pneumatic valve GV2, tee connector T1, tee connector T2, tee connector T3, tee connector T4, tee switch valve TV1, tee switch valve TV2; (e.g.) Figure 2 As shown, the micromixer M includes at least one gas jet inlet, one liquid jet inlet, one fluid outlet, and one micromixing chamber, the volume of which is no greater than 1.0 mL; the equivalent diameter d of the gas jet inlet... g The equivalent diameter d of the micro-mixing chamber is no greater than 1.0 mm. c The equivalent diameter d of the liquid jet inlet is no greater than 10.0 mm. l Not less than 2d g and no greater than 2d c / 3, the equivalent diameter d of the fluid outlet o Not greater than d l The angle θ between the gas jet direction and the liquid jet direction shall not be less than 30°;

[0029] The liquid phase raw material storage tank V p1 The system includes an inlet of a three-way switch valve TV1, a liquid phase pump P1, a three-way switch valve TV2, a flow meter FM2, a micro mixer M, and a circulating mixing tank V. p2 The filter SR1 and the other inlet of the three-way switch valve TV1 are connected in sequence by pipelines; the remaining outlet of the three-way switch valve TV2 and the waste liquid tank V p5 Pipe connection;

[0030] The gaseous raw material storage tank G2, pressure valve GV2, pressure gauge PI1, one inlet of tee connector T1, one inlet of tee connector T2, and gas buffer storage tank V are mentioned. p4 Pressure gauge PI2, shut-off valve SV4, tee connector T3, micro mixer M, circulating mixing tank V p2 Anti-backflow tank V p3 The gas phase pump P2, flow meter FM1, tee connector T4, shut-off valve SV1, and the other inlet of tee connector T1 are connected in sequence by pipelines; the other inlet of tee connector T2, pressure valve GV1, and inert gas storage tank G1 are connected in sequence by pipelines; the remaining outlet of tee connector T4, shut-off valve SV2, and anti-backflow tank V are connected in sequence by pipelines. p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 The circulating mixing tank V is connected by pipelines in sequence. p2 The remaining outlet is connected to the atmosphere.

[0031] Let's denote the three-way switch valve's left-side position as l, right-side position as r, upper position as u, and lower position as d. Taking the three-way switch valve TV1 as an example, simultaneously connect the left-side liquid phase raw material storage tank V. p1 When the filter SR1 on the right is used, it is denoted as TV1(l, r).

[0032] The specific operating steps of the above-mentioned gas-liquid two-phase enhanced mixing device are as follows:

[0033] S1, in inert gas storage tank G1, gaseous feedstock storage tank G2, liquid feedstock storage tank V p1 Add sufficient raw materials and open the three-way switch valve TV1(r,u) and the three-way switch valve TV2(d,r) to form a circulation path between the liquid phase pump P1, the flow meter FM2 and the filter SR1, while all pumps and valves are in the closed state.

[0034] S2, Vacuuming: Open shut-off valves SV2 and SV4, and gas phase pump P2 to evacuate the device, then close shut-off valve SV2 and gas phase pump P2; open pressure valve GV1, introduce inert gas, and then close pressure valve GV1; repeat the above evacuation and charging process several times, then close shut-off valves SV2 and SV4 and gas phase pump P2; at this time, the three-way switch valve is set to TV1(r, u) and TV2(d, r), and all other pumps and valves are in the closed state;

[0035] S3. Feeding: Open the pressure valve GV2 to flush the gas in the gas phase raw material storage tank G2 into the gas buffer storage tank V. p4 Then, close the air pressure valve GV2; adjust the three-way switch valves TV1(l,u) and TV2(d,r), and turn on the liquid phase pump P1 to transfer the liquid phase raw material from the V phase storage tank. p1 The liquid is pumped into the circulating mixing tank V. p2Then, switch the three-way valves TV1(r,u) and TV2(d,r) back to their original positions, and keep the liquid pump P1 open to circulate the liquid circuit.

[0036] S4. Mixing (Reaction): Open shut-off valves SV1 and SV4, and gas pump P2 to circulate the gas path. The gas and liquid phases mix (react) in the micro mixer M. After mixing (reaction) is complete, close liquid pump P1 and gas pump P2. At this time, the three-way switch valves are TV1 (r, u) and TV2 (d, r), shut-off valves SV1 and SV4 are open, and all other valves are closed.

[0037] S5. Waste removal and product collection: Adjust TV1(r,u) and TV2(d,l), turn on liquid phase pump P1, and transfer the circulating mixing tank V... p2 Waste liquid is pumped into waste liquid tank V p5 Then, turn off the liquid phase pump P1 and adjust the three-way switch valves to TV1(r,u) and TV2(d,r); close the shut-off valve SV1 and open the shut-off valve SV2 and the gas phase pump P2 to pump the waste gas into the anti-backflow tank V in sequence. p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 Then close the shut-off valve SV2 and the gas phase pump P2; open the gas pressure valve GV1, introduce inert gas, and then close the gas pressure valve GV1; repeat the above gas filling and purging operation several times, then open the shut-off valve SV3 to release the circulating mixing tank V. p2 The mixed (reaction) products are then processed, and then the shut-off valve SV3 is closed; at this time, the three-way switch valves are TV1(r,u) and TV2(d,r), and the other pumps and valves are in the closed state;

[0038] S6. Cleaning: Clean the liquid phase raw material storage tank V. p1 Replace the cleaning fluid, adjust the three-way valve to TV1 (l, u) and TV2 (d, r), and turn on the liquid phase pump P1 to pump the fluid into the circulating mixing tank V. p2 1. Clean the pump in the pipeline. Adjust the three-way switch valve to TV1(r,u) and TV2(d,r). Keep the liquid phase pump P1 on. After circulating and cleaning, open the shut-off valve SV3 to drain the cleaning fluid and close the shut-off valve SV3 and the liquid phase pump P1. Repeat the above cleaning operation several times.

[0039] Preparation Example 1: Isobutylene-maleic anhydride copolymer was prepared by mixing and reacting using the apparatus of the present invention.

[0040] In this embodiment, the equivalent diameter d of the gas jet inlet of the micromixer M is... g The equivalent diameter d of the cavity is 0.50 mm. c The equivalent diameter d of the liquid jet inlet is 2.50 mm. l The equivalent diameter d of the fluid outlet is 1.60 mm.o The diameter is 0.80 mm, the angle θ between the gas jet direction and the liquid jet direction is 90°, and the Reynolds number is 11699.

[0041] Following the specific implementation method and operating steps described above, 9.5452 g of maleic anhydride and 0.7500 g of azobisisobutyronitrile were dissolved in 150.0 mL of ethyl acetate at room temperature and injected into the liquid phase raw material storage tank V. p1 The gas is repeatedly pumped in and emptied of air using N2 as an inert gas, and then introduced into the gas buffer storage tank V. p4 5.5 g of isobutylene gas at an absolute pressure of 2.0 atm was introduced into the tank, and the mixture was reacted at 70°C. The mixture was then circulated in storage tank V. p2 Extremely fine bubbles are formed (very few bubbles are visible to the naked eye), with a large number of bubbles at the nanoscale. Dynamic light scattering instrumentation shows that the average diameter of isobutylene bubbles is approximately 250 nm, and the particle size distribution is as follows: Figure 3 As shown. The bubble dispersion initially appeared as a uniform, semi-transparent milky white, gradually becoming opaque as the polymerization reaction progressed. Heating was stopped after 2 hours of mixing and reaction. The ethyl acetate waste liquid was pumped into waste liquid tank V. p5 The exhaust gas is pumped sequentially into the exhaust gas absorption tank V containing DMF. p7 And the waste gas absorption tank containing water V p8 The waste gas and DMF carried away by N2 are absorbed separately. Open the shut-off valve SV3 to allow the circulating mixing tank V to... p2 The product is released, and it is cleaned and dried with ethanol; the device is then circulated for cleaning.

[0042] The polydispersity index (Span) of the isobutylene-maleic anhydride copolymer obtained by mixing and polymerization is 0.50.

[0043] Comparative Example 1: Isobutylene-maleic anhydride copolymer was prepared by mixing and reacting in a high-pressure reactor.

[0044] At room temperature, 1.617 g of maleic anhydride and 0.1271 g of azobisisobutyronitrile were dissolved in 44.6 mL of ethyl acetate, and then added to a 100 mL high-pressure reactor. The high-pressure reactor was shut off, and the air in the reactor was repeatedly evacuated by N2. Isobutylene gas (0.93 g) at an absolute pressure of 2.71 atm was added in batches and dissolved. The polymerization reaction was then carried out in a water bath at 70 °C for 3 hours. Heating was stopped, the solid product in the high-pressure reactor was removed, washed with ethanol, and then dried.

[0045] The polydispersity index (Span) of the isobutylene-maleic anhydride copolymer obtained by mixing and polymerization is 0.64.

[0046] Comparing Preparation Example 1 and Comparative Example 1, it can be found that the isobutylene-maleic anhydride copolymer synthesized in Preparation Example 1 has a narrower viscosity-average molecular weight distribution, and the gas environment pressure and time during the reaction are also lower. The suspension and dispersion performance of the isobutylene-maleic anhydride copolymer dispersant on the slurry was tested using Al2O3 particles with an average diameter of approximately 5 μm. Figure 4 As shown, the results indicate that using the isobutylene-maleic anhydride copolymer synthesized in Preparation Example 1 as a dispersant, the Al2O3 particle slurry has a lower sedimentation rate, and the isobutylene-maleic anhydride copolymer synthesized in Preparation Example 1 has better particle dispersibility.

[0047] Preparation Example 2: Carbon dioxide nano-water bubble liquid was prepared by mixing using the apparatus of the present invention.

[0048] In this embodiment, the equivalent diameter d of the gas jet inlet of the micromixer M is... g The equivalent diameter d of the cavity is 0.50 mm. c The equivalent diameter d of the liquid jet inlet is 2.50 mm. l The equivalent diameter d of the fluid outlet is 1.60 mm. o The diameter is 0.80 mm, the angle θ between the gas jet direction and the liquid jet direction is 90°, and the Reynolds number is 5318.

[0049] At room temperature, 150.0 mL of ultrasonically degassed deionized water was injected into the liquid-phase raw material storage tank V. p1 After venting, the gas is transferred to the gas buffer storage tank V. p4 6.5 g of carbon dioxide gas at an absolute pressure of 2.0 atm was introduced, and the gas-liquid mixture was carried out for 0.5 hours. Circulating mixing tank V p2 A carbon dioxide bubble aqueous dispersion was obtained, and the particle size and distribution of the bubble aqueous dispersion were measured using a dynamic light scattering instrument. The average diameter of the bubbles was 690 nm, indicating that the carbon dioxide bubbles were nanoscale and had a small particle size.

[0050] Comparative Example 2: Carbon dioxide-water vaporized liquid was prepared by mixing gas and liquid using a gas-liquid bubbling method.

[0051] High-pressure carbon dioxide gas with an absolute pressure of approximately 5.0 atm was bubbled into water, generating a large number of visible carbon dioxide bubbles that rapidly rose and collapsed due to self-acceleration, indicating the presence of a large number of bubbles with a particle size much larger than 10 μm. Therefore, the bubbles prepared by the gas-liquid bubbling method are much larger than the carbon dioxide nano-water bubble liquid prepared in Preparation Example 2.

[0052] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An apparatus for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing, characterized in that, Includes inert gas storage tank G1, gaseous feedstock storage tank G2, micromixer M, and liquid feedstock storage tank V. p1 Circulating mixing tank V p2 Anti-backflow tank V p3 Gas buffer storage tank V p4 Waste liquid tank V p5 Anti-backflow tank V p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 Liquid pump P1, gas pump P2, flow meter FM1, flow meter FM2, pressure gauge PI1, pressure gauge PI2, filter SR1, shut-off valve SV1, shut-off valve SV2, shut-off valve SV3, shut-off valve SV4, pneumatic valve GV1, pneumatic valve GV2, tee connector T1, tee connector T2, tee connector T3, tee connector T4, tee switch valve TV1, tee switch valve TV2; The liquid phase raw material storage tank V p1 The system includes an inlet of a three-way switch valve TV1, a liquid phase pump P1, a three-way switch valve TV2, a flow meter FM2, a micro mixer M, and a circulating mixing tank V. p2 The filter SR1 and the other inlet of the three-way switch valve TV1 are connected in sequence by pipelines; the remaining outlet of the three-way switch valve TV2 and the waste liquid tank V p5 Pipe connection; The gaseous raw material storage tank G2, pressure valve GV2, pressure gauge PI1, one inlet of tee connector T1, one inlet of tee connector T2, and gas buffer storage tank V are mentioned. p4 Pressure gauge PI2, shut-off valve SV4, tee connector T3, micro mixer M, circulating mixing tank V p2 Anti-backflow tank V p3 The gas phase pump P2, flow meter FM1, tee connector T4, shut-off valve SV1, and the other inlet of tee connector T1 are connected in sequence by pipelines; the other inlet of tee connector T2, pressure valve GV1, and inert gas storage tank G1 are connected in sequence by pipelines; the remaining outlet of tee connector T4, shut-off valve SV2, and anti-backflow tank V are connected in sequence by pipelines. p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 Connect the pipes sequentially; The circulating mixing tank V p2 The remaining outlet is connected to the atmosphere.

2. The apparatus for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing according to claim 1, characterized in that, The micromixer M includes at least one gas inlet, one liquid inlet, one fluid outlet, and one micromixing chamber.

3. The apparatus for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing according to claim 2, characterized in that, The micromixer M includes at least one gas jet inlet and one liquid jet inlet.

4. The apparatus for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing according to claim 3, characterized in that, The volume of the micro-mixing chamber is no greater than 1.0 mL.

5. The apparatus for preparing nanobubble liquid by enhanced gas-liquid two-phase mixing according to claim 4, characterized in that, The equivalent diameter of the gas jet inlet d g The equivalent diameter of the micro-mixing chamber is no greater than 1.0 mm. d c The equivalent diameter of the liquid jet inlet is no greater than 10.0 mm. d l Not less than 2 d g and not greater than 2 d c / 3, Equivalent diameter of fluid outlet d o Not greater than d l The angle between the gas jet direction and the liquid jet direction Not less than 30°.

6. A method for preparing nanobubble liquid based on the apparatus for gas-liquid two-phase enhanced mixing according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1, in inert gas storage tank G1, gaseous feedstock storage tank G2, liquid feedstock storage tank V p1 Add sufficient raw materials, open the three-way valve TV1 to connect the filter SR1 and the liquid phase pump P1, open the three-way valve TV2 to connect the liquid phase pump P1 and the flow meter FM2, forming a circulation path between the liquid phase pump P1, the flow meter FM2 and the filter SR1, and all other pumps and valves are in the closed state. S2, Vacuuming: Open shut-off valves SV2 and SV4 and gas phase pump P2 to evacuate the device, then close shut-off valves SV2 and gas phase pump P2; open pressure valve GV1, introduce inert gas, then close pressure valve GV1; repeat the above evacuation and filling process several times, then close shut-off valves SV2 and SV4 and gas phase pump P2. S3. Feeding: Open the pressure valve GV2 to flush the gas in the gas phase raw material storage tank G2 into the gas buffer storage tank V. p4 Afterwards, close the air pressure valve GV2; adjust the three-way switch valve TV1 to connect the liquid phase raw material storage tank V. p1 With liquid phase pump P1 turned on, the liquid phase raw material storage tank V was opened. p1 The liquid is pumped into the circulating mixing tank V. p2 Then, switch the three-way valve TV1 back to connect the filter SR1 and the liquid pump P1. Keep the liquid pump P1 open to circulate the liquid circuit. S4. Mixing reaction: Open shut-off valves SV1 and SV4 and gas phase pump P2 to circulate the gas path. The gas and liquid phases mix and react in the micro mixer M. After the mixing reaction is completed, turn off liquid phase pump P1 and gas phase pump P2. S5. Waste removal and product collection: Adjust the three-way valve TV2 to connect the liquid phase pump P1 and the waste liquid tank V. p5 Turn on the liquid phase pump P1 to open the circulating mixing tank V. p2 Waste liquid is pumped into waste liquid tank V p5 Then, shut off the liquid phase pump P1, and switch the three-way valve TV2 back to connect the liquid phase pump P1 and the flow meter FM2; close the shut-off valve SV1, and open the shut-off valve SV2 and the gas phase pump P2 to pump the exhaust gas sequentially into the anti-backflow tank V. p6 Waste gas absorption tank V p7 Waste gas absorption tank V p8 Then close the shut-off valve SV2 and the gas phase pump P2; open the gas pressure valve GV1, introduce inert gas, and then close the gas pressure valve GV1; repeat the above gas filling and purging operation several times, then open the shut-off valve SV3 to release the circulating mixing tank V. p2 The mixed reaction products in the mixture are then removed, and the shut-off valve SV3 is closed.

7. The method for preparing nanobubble liquid according to claim 6, characterized in that, After waste removal and product collection, a cleaning process is also included, the specific process of which is as follows: in the liquid phase raw material storage tank V p1 Replace the cleaning fluid and adjust the three-way valve TV1 to connect the liquid phase raw material storage tank V. p1 With liquid phase pump P1 turned on, the liquid phase pump P1 is used to pump the circulating mixing tank V. p2 Pump cleaning fluid into the pipeline, turn the three-way valve TV1 back to connect filter SR1 and liquid phase pump P1, keep liquid phase pump P1 open, circulate and clean, open shut-off valve SV3 to drain the cleaning fluid, and close shut-off valve SV3 and liquid phase pump P1. Repeat the above cleaning operation several times.

8. The method for preparing nanobubble liquid according to claim 6, characterized in that, The volume solubility of the gaseous feedstock in the liquid phase is no more than 1%.

9. The method for preparing nanobubble liquid according to claim 6, characterized in that, The sum of the Reynolds numbers at each jet inlet of the micromixer M is not less than 2000.

Images