A foam separation device and method for high-efficiency foaming under high gravity

Abstract

The application discloses a kind of supergravity high-efficiency foaming foam separation device and method, belong to chemical separation equipment field.The device includes supergravity rotating packing bed, foam rectifying tower and foam stripping tower;Foam rectifying tower is connected with the top of supergravity rotating packing bed;Foam stripping tower is connected with the bottom of supergravity rotating packing bed;The gas inlet of foam stripping tower bottom and supergravity rotating packing bed is connected with gas conveying pipeline, and gas conveying pipeline is composed of fan, gas buffer tank, gas valve, gas flow meter connected in sequence;Supergravity rotating packing bed connects liquid conveying pipeline, and liquid conveying pipeline includes raw material liquid tank, pump, liquid valve and liquid flow meter connected in sequence.The application solves the problems of traditional foam separation equipment, such as large and uneven bubbling, slow mass transfer efficiency and low separation efficiency, increases the effective area of gas-liquid contact by using supergravity technology, greatly improves the separation effect, and realizes the efficient separation of target substance.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of supergravity high-efficiency foaming foam separation device and method, belong to chemical separation equipment field. BACKGROUND

[0002] Foam separation technology is an effective method for separating and enriching trace substances, which is based on the principle of interfacial chemical surface adsorption, and uses the bubbles generated by aeration to separate the solute or particles in the liquid phase. This technology is based on the difference in surface activity between various components in the solution, and has the advantages of simple equipment, low energy consumption, easy operation, low operating cost, high efficiency at low concentration, no pollution and suitability for large-scale industrial production. In recent years, with the development of foam separation technology, the separation objects have expanded from solid minerals to metal ions, organic pollutants, biomolecules (such as proteins), enzymes, etc. It is one of the emerging separation technologies with great development prospects.

[0003] There are two necessary conditions for foam separation technology to separate: first, the material to be separated needs to have surface activity itself or be able to combine with a certain type of surface active agent material, so that the material to be separated is adsorbed on the foam with the gas bubble as the medium. The adsorption of the surface active agent on the interface changes the interfacial properties including surface tension, thereby affecting the foaming property and stability of the foam. Second, the liquid phase main body can generate a large number of micro-bubbles, and the material to be separated is separated from the liquid phase main body with the help of the bubbles, and is enriched at the top of the tower. The foam can be continuously collected from the top of the tower without collapsing violently (the enriched material can form a stable foam layer during the separation process). After separation, defoaming treatment is carried out to obtain the enriched product. The entire mass transfer process includes two stages: one stage occurs in the bubbling zone between the liquid phase main body and the bubble surface; the other stage occurs in the foam zone on the bubble surface.

[0004] When the solute to be separated in the solution itself is a surface-active component, the foam formed by the gas in the solution can be used to enrich the solute on the foam, and then the foam is collected and defoamed to obtain a foam liquid with a higher content of the solute than the raw material liquid. Surfactants are a class of compounds with special amphiphilic structure, which are usually composed of hydrophilic groups and hydrophobic groups. The structure can cause the aggregation of surfactants on the surface, which can reduce the surface tension of the liquid and cause the surfactant molecules to be oriented and arranged on the surface with the hydrophilic group in the water phase and the hydrophobic group away from the water phase. When it exists in a system at a low concentration, it can significantly change the properties of the free energy of the surface (or interface). When the concentration exceeds the critical micelle concentration, the excess surfactant molecules exist in the bulk solution in the form of micelles. Foam separation is a method developed by utilizing the interfacial selective orientation and adsorption of surfactants. The process parameters involved in foam separation technology include feed concentration, solution pH, separation temperature, gas inlet speed, liquid volume, gas distributor pore size, etc., and the main goal is to improve the effect of foam separation.

[0005] The traditional foam separation equipment is a vertical single-stage foam separation column with the foam phase above the liquid phase, no internal components added in the foam phase and the liquid phase, and no reflux device. The column body is generally an organic glass elongated cylinder, and the height-diameter ratio is usually greater than 10, which aims to reduce the axial back mixing and provide sufficient gas-liquid contact and foam drainage time to obtain better foam separation effect. However, the traditional foam separation equipment has certain limitations in the adsorption of target substances and foam drainage, and cannot achieve better separation effect.

[0006] Chinese patent CN110240625A discloses a separation method and foam separation device for quinoa saponin. The method uses foam separation technology to separate and extract quinoa saponin. The optimal raw material liquid concentration is 0.5296 mg / mL, the temperature is 25°C, the air flow rate is 22 mL / min, and the raw material liquid volume is 250 mL. Among them, the enrichment ratio of quinoa saponin is 2.0-2.6, and the recovery rate is 42%-52%. The invention optimizes the process parameters (pH, temperature, gas flow, etc.) involved in the experiment to improve the effect of foam separation.

[0007] Chinese patent CN109336945A discloses a water extraction-foam separation method of tea saponin in oil tea cake meal, which comprises the steps of tea saponin water extraction, foam separation, repeated purification and the like. The invention also relates to a foam separation device, which comprises a raw material processing device, a foam processing device and a foam reflux device. The invention extracts tea saponin from tea cake meal, and realizes it through the foam separation device in the invention, wherein the tea saponin extraction rate is 13.86%, the tea saponin yield reaches 73.21%, and the concentration multiple reaches 2.15.

[0008] At present, the foam separation equipment has certain limitations on the adsorption of target substances and foam drainage, and cannot achieve good separation effect. Among them, there are the following deficiencies: (1) the existing equipment has large bubbles and uneven distribution, the effective contact area of the target substance on the gas-liquid interface is limited, which directly affects the mass transfer rate and adsorption efficiency of the gas-liquid interface, resulting in poor separation effect; (2) the enrichment ratio and recovery rate are still contradictory and difficult to balance in inverse proportion; (3) the foam separation equipment with added internal components is relatively complex, has large pressure drop, high processing cost and limited application.

[0009] The traditional foam separation process has problems of large and uneven bubbles, slow mass transfer efficiency and low separation efficiency, so reducing the bubble size, improving the bubble morphology, and improving the mass transfer efficiency and separation efficiency are the problems to be solved at present.

[0010] In order to achieve the above purpose, the present application provides a supergravity high-efficiency foaming foam separation device and method. SUMMARY

[0011] In view of the problems of large bubbles, slow mass transfer efficiency and low separation efficiency in the current foam separation technology, the present application provides a supergravity high-efficiency foaming foam separation device and method.

[0012] The innovation of the present application is embodied in: ① The supergravity technology is applied to the foam separation field for the first time, the supergravity foam separation technology is created, and a supergravity high-efficiency foaming foam separation device is independently developed. The supergravity technology can greatly strengthen the foam separation process. The supergravity technology can effectively improve the gas-liquid mass transfer efficiency. The high-speed rotating filler in the supergravity field generates a huge shear force. The liquid is torn into a micro-liquid state for several times, rapidly contacts with the gas, accelerates the gas-liquid surface update frequency and the liquid turbulence degree, increases the effective contact area of the target substance on the gas-liquid interface, and greatly improves the interfacial mass transfer rate. ② After the raw material liquid enters the supergravity rotating filler bed, uniform sub-millimeter micro-bubbles can be quickly generated. The dispersion-aggregation process of the bubbles for several times strengthens the liquid phase adsorption process. Then, the bubbles directly contact with the gas, greatly increase the effective contact area of the bubbles and the gas, accelerate the gas-liquid interfacial velocity, improve the surface adsorption capacity, have high foaming rate, and rapidly complete the gas-liquid mass transfer process. The surfactant can quickly form bubbles under the action of stirring due to its low surface tension. The surfactant can form bubbles more quickly under the action of the high-speed rotating filler, and the bubbles can be sheared into a very small size. The specific surface area is increased, and the gas-liquid interface is continuously updated, so that the adsorption capacity and the separation efficiency are improved.

[0013] The present application provides a supergravity high-efficiency foaming foam separation device, which comprises a supergravity rotating filler bed, a foam rectifying tower and a foam distillation tower.

[0014] The bottom of the foam distillation tower and the gas inlet of the supergravity rotating filler bed are connected with a gas conveying pipeline, and the gas conveying pipeline comprises a fan, a gas buffer tank, a gas valve and a gas flow meter connected in sequence.

[0015] The supergravity rotating filler bed is connected with a liquid conveying pipeline, and the liquid conveying pipeline comprises a raw material liquid tank, a pump, a liquid valve and a liquid flow meter connected in sequence.

[0016] Further, the supergravity rotating filler bed comprises a rotor, a filler, a shell, a motor, a liquid distributor, a gas inlet is arranged on the lower side of the shell, a liquid inlet and a foam outlet are arranged on the top of the shell, and a liquid outlet is arranged on the bottom of the shell. The rotor is internally provided with various fillers, and the bottom of the rotor is connected with the motor and driven to rotate by the motor. The foam outlet of the supergravity rotating filler bed is connected with the gas inlet of the foam rectifying tower, the liquid outlet of the supergravity rotating filler bed is connected with the foam outlet of the foam distillation tower, and the liquid inlet is connected with the liquid conveying pipeline to convey the liquid to the inside of the filler through the liquid distributor.

[0017] Further, the foam distillation column body is cylindrical, and a bend is arranged at the top of the column body, the bend is semicircular, and the other end of the bend is connected with an anti-overflow cover, wherein the ratio of the diameter of the bottom of the anti-overflow cover to the diameter of the upper part is in the range of 1:1 to 10:1, the anti-overflow cover is a straight cylinder or a gradually expanding shape, and the shape is determined by the diameter ratio; the anti-overflow cover is connected with a foam catcher; a reflux pipe is arranged below one side of the foam distillation column body, part of the reflux liquid in the foam catcher flows into the foam distillation column, and the other part flows into a defoaming liquid collecting tank; a flow distribution valve is arranged on the liquid outlet pipe of the foam catcher, the flow distribution valve can be manually or automatically adjusted, the opening degree of the valve is adjusted to control the flow distribution ratio of the reflux liquid and the defoaming liquid, a flow meter is arranged on the pipe through which the reflux liquid flows into the foam distillation column and the pipe through which the defoaming liquid flows into the collecting tank, the flow of the reflux liquid and the defoaming liquid is monitored in real time, the opening degree of the valve is accurately adjusted, and dynamic control of the liquid flow is realized. If conditions permit, an automatic control system can be installed, and the opening degree of the flow distribution valve is automatically adjusted according to a preset flow distribution ratio. For example, when the liquid flow reaches a certain amount, the system automatically reduces the reflux flow and increases the amount of defoaming liquid.

[0018] Further, the structure of the anti-overflow cover is a bowl-shaped structure with an upper opening and a lower opening, the upper end opening is connected with the bend, and the lower end opening is connected with the foam catcher, so that overflow of the foam is prevented; the structure of the foam catcher is that the body is cylindrical, an ultrasonic device is arranged on one side in the interior of the body, and an ultrasonic rod extends into the interior to break the foam; needle-shaped bubble breakers are arranged at the bottom and on the side, the needle-shaped bubble breakers are wolf tooth rod type structures, and the sharp ends are arranged upward; the ultrasonic rod and the needle-shaped bubble breakers can be used simultaneously or separately, and the size of the needle-shaped bubble breakers is determined according to the size of the foam catcher.

[0019] Further, the foam distillation column body is cylindrical, the foam outlet at the top of the column body is connected with the liquid outlet of the high-gravity rotating packed bed, the gas blown out by the fan enters the column through the gas inlet, and a gas distributor is arranged above the gas inlet; the residual liquid outlet is arranged at the bottom of the column body and connected with a residual liquid collecting tank.

[0020] Further, the residual liquid collecting tank is connected with the liquid inlet of the high-gravity rotating packed bed.

[0021] Further, the packing of the high-gravity rotating packed bed is at least one or a combination of multiple kinds of the following: a Pall ring, a wire mesh packing, a spherical packing, and an arc saddle packing, and the type of the packing can be replaced.

[0022] Further, the height-diameter ratio of the foam distillation column and the foam rectification column is in the range of 5 to 50.

[0023] The present invention provides a foam separation method with high-efficiency foaming under high gravity. In the above-mentioned foam separation device with high-efficiency foaming under high gravity, a raw material liquid is foamed in a high-gravity rotating packed bed to generate a foam phase and a liquid phase. The foam phase enters a foam distillation tower through a gas outlet of the rotating packed bed, and a high-concentration target substance is collected at the top of the foam distillation tower; the liquid phase enters a foam stripping tower due to gravity for further foam separation, and the remaining liquid phase component is obtained at the bottom of the foam distillation tower.

[0024] The above-mentioned method for separating foam by high-efficiency supergravity foaming comprises the following steps:

[0025] The raw material liquid is placed in the raw material liquid storage tank, the high-gravity rotating packed bed is set to a certain speed, the motor is started, and the liquid in the raw material liquid storage tank is pumped into the high-gravity rotating packed bed through the liquid delivery pipe from the liquid inlet, and is sprayed radially through the inner edge of the packing by the liquid distributor. At the same time, the fan is started to blow in gas, which passes through the gas buffer tank and adjusts the gas flow meter. When the gas speed tends to be stable, the gas is divided into two paths and enters the foam distillation tower and the high-gravity rotating packed bed respectively. One gas pipeline enters the foam distillation tower from the gas inlet through the gas distributor and rises to the rotating packed bed. The other gas pipeline enters the high-gravity rotating packed bed from the gas inlet. Then the two gas streams are collected in the rotating packed bed. At this time, the raw material liquid and gas are fully in contact in the rotating packed bed, generating a large number of evenly distributed submillimeter microbubbles. Under the action of centrifugal force, the bubbles are thrown between the outer edge of the packing and the inner wall of the shell. Due to the action of gas pressure, the bubbles enter the foam distillation tower from the foam outlet to realize the foam separation process. The foam enters the foam catcher through the overflow shield. Most of the bubbles form defoaming liquid in the foam catcher through the ultrasonic rod or needle-shaped bubble breaker. The diversion ratio of the reflux liquid and the defoaming liquid is controlled by adjusting the opening of the diversion valve on the liquid outlet pipe of the foam catcher, wherein a part of the defoaming liquid enters the defoaming liquid collecting tank, and the other part of the defoaming liquid is introduced into the foam distillation tower from the side port of the foam distillation tower as the reflux liquid; at the same time, during the foam separation process, the foam interstitial liquid and the reflux liquid flow into the supergravity rotating packed bed due to gravity and are discharged through the liquid outlet and transferred to the foam distillation tower, and the continuously rising gas and liquid are again separated from the foam, and the foam is transferred into the supergravity rotating packed bed again under the action of the gas, and finally returns to the foam catcher. When the foam no longer overflows, the valve of the reflux pipe is closed, and the remaining defoaming liquid is all transferred to the defoaming liquid collecting tank, and the residual liquid in the foam distillation tower is introduced into the residual liquid collection tank, and finally the residual liquid is collected.

[0026] In the above method, the gas-liquid contact mode is one of cross-flow, counter-flow or co-flow, the hypergravity factor is 5 to 120; and the gas is at least one or more of air, carbon dioxide, nitrogen, oxygen or inert gas.

[0027] In the above separation method, the reflux ratio of the defoaming liquid, the height of the stripping section, the height of the rectifying section, and the packing height are determined based on the foam rising speed, the gas-liquid flow rate, and the separation effect; that is, the reflux ratio is controlled by controlling factors such as the gas flow rate, the liquid flow rate, the concentration of the raw material liquid, and the pH value, and ultimately, an appropriate reflux ratio is selected during operation to ensure that the process can be operated continuously;

[0028] The reflux ratio R refers to the ratio of the reflux liquid flow rate L in the defoaming liquid returning to the tower to the liquid flow rate D in the defoaming liquid collection tank, that is, R=L / D; the gas flow rate and liquid flow rate need to be analyzed and determined based on the specific equipment, and the raw liquid concentration and pH need to be determined based on the target substance and the exploration experiment. If the target substance is a surfactant, the raw liquid concentration needs to be kept below the critical micelle concentration.

[0029] Beneficial effects of the present invention:

[0030] (1) The ultra-gravity high-efficiency foaming foam separation device and method provided by the present invention solves the problems faced by traditional foam separation equipment, such as large and uneven bubbles, slow mass transfer efficiency, and low separation efficiency; and achieves high-efficiency separation performance of the target substance;

[0031] (2) The present invention utilizes supergravity technology to increase the effective area of ​​gas-liquid contact, achieving the advantage of full adsorption of the target substance on the interface, which can reach submillimeter microbubbles, while achieving the stabilization of the bubble morphology, effectively increasing the contact time between the bubbles and the target substance in the main liquid phase, and greatly improving the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the foam separation device for high-efficiency supergravity foaming according to the present invention;

[0033] Figure 2 Schematic diagram of the foam distillation tower in the device of the present invention;

[0034] Figure 3 Schematic diagram of the foam stripping tower in the device of the present invention;

[0035] Figure 4 It is a structural diagram of the overflow prevention cover in the device of the present invention;

[0036] Figure 5 for Figure 4 A top view of the middle overflow hood;

[0037] Figure 6 It is the reflux and defoaming liquid collecting unit of the present invention;

[0038] Figure 7 It is a structural diagram of the foam catcher in the device of the present invention;

[0039] Figure 8 for Figure 7Top view of the internal structure of the middle foam catcher;

[0040] Figure 9 This is a diagram of the internal structure of the high-gravity rotating packed bed of the present invention.

[0041] In the figure: 1. raw liquid storage tank; 2. pump; 3. liquid valve; 4. liquid flow meter; 5. supergravity rotating packed bed; 6. foam distillation tower; 7. fan; 8. gas buffer tank; 9. gas valve; 10. gas flow meter; 11. foam distillation tower; 12. residual liquid collecting tank; 13. overflow prevention cover; 14. ultrasonic rod; 15. foam catcher; 16. diverter valve; 17. defoaming liquid collecting tank; 18. ultrasonic disperser; 19. motor; 601. foam distillation tower gas inlet; 602. foam distillation tower side port; 1101. foam distillation tower gas inlet; 1102. gas distributor; 1103. foam distillation tower residual liquid outlet; 1104. foam outlet of foam distillation tower; 501. gas inlet; 502. liquid inlet; 503. foam outlet; 504. liquid outlet; 505. packing; 506. liquid distributor. DETAILED DESCRIPTION

[0042] The present invention will be further described below by means of specific examples, but the protection scope of the invention is not limited thereto. Example 1

[0043] like Figures 1 to 9 As shown, a high-gravity high-efficiency foaming foam separation device includes a high-gravity rotating packed bed 5, a foam distillation tower 6 and a foam stripping tower 11; the foam distillation tower 6 is connected to the top of the high-gravity rotating packed bed 5; the foam stripping tower 11 is connected to the bottom of the high-gravity rotating packed bed 5;

[0044] The bottom of the foam stripping tower 11 and the high-gravity rotating packed bed 5 are connected to a gas delivery pipeline, which is composed of a blower 7, a gas buffer tank 8, a gas valve 9, and a gas flow meter 10 connected in sequence. The gas delivery pipeline is connected to the gas inlet 1101 of the foam stripping tower and the gas inlet 501 of the high-gravity rotating packed bed;

[0045] The high-gravity rotating packed bed 5 is connected to a liquid delivery pipeline, which includes a raw material liquid storage tank 1, a pump 2, a liquid valve 3 and a liquid flow meter 4 connected in sequence.

[0046] Furthermore, the high-gravity rotating packed bed 5 includes a rotor, packing 505, a shell, a motor 19, and a liquid distributor 506. A gas inlet 501 (connected to a gas delivery pipeline) is provided on the lower side of the shell, a liquid inlet 502 and a foam outlet 503 are provided on the top, and a liquid outlet 504 is provided on the bottom; various packings 505 are installed in the rotor, and the bottom of the rotor is connected to the motor 19 and is driven to rotate by the motor 19; the foam outlet 503 of the high-gravity rotating packed bed 5 is connected to the gas inlet 601 of the foam distillation tower, and its liquid outlet 504 is connected to the foam outlet 1104 of the foam distillation tower; the liquid inlet 502 is connected to the liquid delivery pipeline, and the liquid is transported to the inside of the packing through the liquid distributor 506.

[0047] Furthermore, the foam distillation tower 6 has a cylindrical body and is provided with an elbow on the top, which is semicircular, and the other end of the elbow is connected to an anti-overflow hood 13, wherein the ratio of the bottom diameter to the upper diameter of the anti-overflow hood is 1:1~10:1, and the anti-overflow hood is straight or gradually expanding, and its shape is determined by the diameter ratio; the anti-overflow hood 13 is connected to the foam catcher 15; a reflux pipe is provided at the bottom of one side of the foam distillation tower 6, and a part of the reflux liquid in the foam catcher 15 flows into the foam distillation tower 6, and the other part enters the defoaming liquid collecting tank 17; a diverter valve 16 is provided on the liquid outlet pipe of the foam catcher 15, and the diverter valve 16 can be adjusted manually or automatically. The diversion ratio of the reflux liquid and the defoaming liquid is controlled by adjusting the opening of the valve. A flow meter is installed on each pipe for the reflux liquid to enter the foam distillation tower 6 and the defoaming liquid to enter the collecting tank to monitor the flow of the reflux liquid and the defoaming liquid in real time, accurately adjust the opening of the valve, and realize dynamic control of the liquid flow. If conditions permit, an automatic control system can be installed to automatically adjust the opening of the diverter valve according to the preset diverter ratio. For example, when the liquid reaches a certain reflux volume, the system automatically reduces the reflux volume and increases the amount of defoaming liquid.

[0048] Furthermore, the structure of the overflow prevention cover 13 is: a bowl-shaped structure with upper and lower openings, the upper opening is connected to an elbow, and the lower opening is connected to a foam catcher to prevent foam from overflowing and affecting the separation efficiency; the structure of the foam catcher is: the body of the device is cylindrical, and an ultrasonic rod 14 is installed on one side of the interior, and the ultrasonic rod extends into the interior to break the foam; the ultrasonic rod 14 is connected to the ultrasonic disperser 18; a needle-shaped foam breaker is arranged at the bottom and side of the foam catcher, and the needle-shaped foam breaker is a mace-shaped structure with sharp thorns arranged upward; the ultrasonic rod and the needle-shaped foam breaker can be used simultaneously or separately, and the size of the needle-shaped foam breaker is determined according to the size of the foam catcher.

[0049] Furthermore, the foam distillation tower 11 has a cylindrical body, the top foam outlet is connected to the liquid outlet of the supergravity rotating packed bed, the gas blown out by the fan enters the tower from the gas inlet, and a gas distributor 1102 is provided above the gas inlet; the residual liquid outlet is provided on the side of the bottom of the tower and is connected to the residual liquid collection tank 12.

[0050] Furthermore, the residual liquid collecting tank 12 is connected to the liquid inlet of the high-gravity rotating packed bed 5 .

[0051] Furthermore, the filler 505 of the high-gravity rotating packed bed is at least one or more combinations of ball ring filler, wire mesh filler, spherical filler, and arc saddle filler, and the type of filler can be replaced.

[0052] Furthermore, the aspect ratio of the foam distillation tower 6 and the foam stripping tower 11 is in the range of 5-50.

[0053] The present invention provides a foam separation method with high-efficiency foaming under high gravity. In the above-mentioned foam separation device with high-efficiency foaming under high gravity, a raw material liquid is foamed in a high-gravity rotating packed bed to generate a foam phase and a liquid phase. The foam phase enters a foam distillation tower through a gas outlet of the rotating packed bed, and a high-concentration target substance is collected at the top of the foam distillation tower; the liquid phase enters a foam stripping tower due to gravity for further foam separation, and the remaining liquid phase component is obtained at the bottom of the foam distillation tower.

[0054] The above-mentioned high-efficiency foaming foam separation method comprises the following steps:

[0055] The raw material liquid is placed in the raw material liquid storage tank 1, and the high-gravity rotating packed bed is preheated first, set to a certain speed, and started by the motor 19. The liquid in the raw material liquid storage tank is pumped into the high-gravity rotating packed bed through the liquid delivery pipe from the liquid inlet 502 by the pump 2, and is sprayed radially through the inner edge of the packing 505 by the liquid distributor 506. At the same time, the fan 7 is started to blow in gas, and the gas is blown in at a specified flow rate through the gas buffer tank 8. The gas flowmeter 10 is adjusted to ensure that the gas intake speed is blown in at a specified flow value. When the gas speed tends to be stable, the gas is divided into two paths and enters the foam distillation tower 11 and the high-gravity rotating packed bed 5 respectively. One gas pipeline enters from the gas inlet 1101 of the foam distillation tower through the gas distributor 1102 and rises to the high-gravity rotating packed bed 5. The other gas pipeline enters the high-gravity rotating packed bed 5 from the gas inlet 501, and then the two gas streams converge in the rotating packed bed 5. Driven by the motor, the rotor and the packing rotate at high speed together, fully contacting with the gas, increasing the gas-liquid mass transfer contact area, rapidly generating bubbles, and starting the foam separation process; the raw liquid and the gas are fully contacted in the rotating packing bed, generating a large number of evenly distributed submillimeter microbubbles. Under the action of centrifugal force, the bubbles are thrown between the outer edge of the packing and the inner wall of the shell. Due to the action of gas pressure, the bubbles enter the foam distillation tower 6 from the foam outlet 503 to realize the foam separation process. The foam enters the foam catcher 15 through the overflow shield 13, and most of the bubbles form defoaming liquid in the foam catcher. By regulating the opening of diverter valve 16 on the liquid outlet pipe of foam catcher, control the diversion ratio of reflux liquid and defoamer, wherein, a part of defoamer enters defoamer collecting tank 17, and another part defoamer is introduced in foam distillation tower 6 as reflux liquid from foam distillation tower side port 602; Meanwhile, foam interstitial liquid and reflux liquid flow into supergravity rotating packed bed 5 and are discharged through liquid outlet 504 in foam separation process, change in foam stripping tower 11, the gas and liquid that continues to rise realize foam separation again, foam changes over to supergravity rotating packed bed again under gas action, finally get back to foam catcher 15, when foam no longer overflows, close the valve 16 of reflux line, residue defoamer all changes over to defoamer collecting tank 17, after the surplus liquid in foam stripping tower 11 is introduced surplus liquid collecting tank 12, finally collects residual liquid.After use, need to add deionized water again to clean foam tower and supergravity rotating packed bed more than twice.

[0056] In the above method, the gas-liquid contact mode is one of cross-flow, counter-flow or co-flow, the hypergravity factor is 5 to 120; and the gas is at least one or more of air, carbon dioxide, nitrogen, oxygen or inert gas.

[0057] The separation efficiency of foam separation technology is evaluated by the enrichment ratio E and the recovery rate R:

[0058] Recovery rate:

[0059] Enrichment ratio:

[0060] Where, C f Indicates the concentration of target substance in the collected defoaming solution (mg / L), C 0 represents the initial concentration of the target solute in the feed solution (mg / L), C w Indicates the concentration of target substance in the residual liquid (mg / L); V w represents the residual liquid volume (L), V 0 represents the volume of the raw material solution (feed solution) (L), V f Indicates the volume of defoaming solution (L).

[0061] In order to make the above-mentioned purpose of the present invention more intuitive, the specific implementation methods of the technical solution of the present invention are described in detail below in conjunction with specific embodiments.

[0062] Example 2: This experiment used a simulated surfactant wastewater system consisting of an aqueous sodium dodecylbenzenesulfonate (SDBS) solution with an SDBS concentration of 300 mg / L. The experiment was continuous, with a wastewater treatment volume of 4 L per run. The surfactant wastewater was pumped through liquid inlet 502 of the high-gravity rotating packed bed, with a liquid phase height of 500 mm and a foam height of 800 mm. The gas velocity was 300 L / h, the feed flow rate was 300 mL / min, the high-gravity factor was 40, the experimental temperature was maintained at 25°C, and the run time was 40 minutes. The experiment was terminated when the foam ceased to bulge. The foam entered defoaming liquid collection tank 17, and the residual liquid was collected in residual liquid collection tank 12. The final SDBS recovery rate in this example was 98.79%, and the enrichment ratio was 35.79, indicating good separation results. Example 3

[0063] The experiment adopts simulated soybean whey wastewater as a separation system to extract soybean whey protein in the wastewater. On the basis of studying the effects of initial pH value, bubble size, apparent gas velocity, feed concentration and foam layer height on the effect of foam separation of soybean protein wastewater, an ultra-gravity high-efficiency foaming foam separation device capable of simultaneously improving enrichment ratio and recovery rate is invented. With SDS as a capturing agent and a foaming agent, the optimal separation conditions are determined, the experimental temperature is maintained at 25 DEG C, the whey protein concentration is 200 mg / L, the pH is 4.1, the ultra-gravity factor is 30, the gas velocity is 40 L / h, the feed flow is 350 mL / min, the foam phase is 500 mm, the liquid phase height is 700 mm, the operation time is 35 min, the residual liquid enters the residual liquid tank and is mixed with the raw material liquid again to carry out foam separation, the experiment is stopped when the foam is no longer out, the foam enters the defoaming liquid collection tank 17, and the residual liquid enters the residual liquid collection tank 12 for collection. Finally, the total recovery rate of soybean whey protein in the embodiment is 98.8%, the enrichment ratio is 40.1, and the separation effect is better.

[0064] The skilled in the art can select from the prior art for the rest of the embodiments of the present application.

[0065] The above disclosure is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and those skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high-efficiency foaming foam separation device with super gravity, characterized by: It includes a supergravity rotating packed bed, a foam distillation tower and a foam stripping tower; the foam distillation tower is connected to the top of the supergravity rotating packed bed; the foam stripping tower is connected to the bottom of the supergravity rotating packed bed; the bottom of the foam stripping tower and the supergravity rotating packed bed are connected to a gas delivery pipeline, which is composed of a blower, a gas buffer tank, a gas valve, and a gas flow meter connected in sequence, and the gas delivery pipeline is connected to the gas inlet of the foam stripping tower and the supergravity rotating packed bed; the supergravity rotating packed bed is connected to a liquid delivery pipeline, which includes a raw material liquid tank, a pump, a liquid valve and a liquid flow meter connected in sequence; The foam outlet of the high-gravity rotating packed bed is connected to the gas inlet of the foam distillation tower, and the liquid outlet thereof is connected to the foam outlet of the foam stripping tower.

2. The high-efficiency foaming foam separation device according to claim 1, characterized in that: The high-gravity rotating packed bed includes a rotor, packing, a shell, a motor, and a liquid distributor. The lower side of the shell is provided with a gas inlet, the top is provided with a liquid inlet and a foam outlet, and the bottom is provided with a liquid outlet. Various packings are installed in the rotor, and the bottom of the rotor is connected to the motor and is driven to rotate by the motor. The liquid inlet is connected to the liquid delivery pipeline to deliver the liquid to the inside of the packing through the liquid distributor.

3. The high-efficiency foaming foam separation device according to claim 1, characterized in that: The foam distillation tower body is cylindrical, with an elbow at the top, the elbow is semicircular, and the other end of the elbow is connected to an overflow prevention cover, wherein the ratio of the bottom diameter to the upper diameter of the overflow prevention cover is in the range of 1:1 to 10:1, and the overflow prevention cover is straight or gradually expanded, and its shape is determined by the diameter ratio; the overflow prevention cover is connected to a foam catcher; a reflux pipe is provided below one side of the foam distillation tower, and part of the reflux liquid in the foam catcher flows into the foam distillation tower, and the other part enters the defoaming liquid collection tank; a diverter valve is provided on the liquid outlet pipe of the foam catcher, and the diverter valve can be adjusted manually or automatically, and the diversion ratio of the reflux liquid and the defoaming liquid is controlled by adjusting the opening of the valve.

4. The high-efficiency foaming foam separation device according to claim 3, characterized in that: The structure of the overflow prevention cover is: a bowl-shaped structure with upper and lower openings, the upper opening is connected to an elbow, and the lower opening is connected to a foam catcher to prevent foam overflow; the structure of the foam catcher is: the body of the device is cylindrical, an ultrasonic device is installed on one side of the interior, and an ultrasonic rod extends into the interior to break the foam; needle-shaped foam breakers are arranged at the bottom and side, and the needle-shaped foam breakers are mace-shaped structures with sharp spikes facing upward; the ultrasonic rod and the needle-shaped foam breakers can be used simultaneously or separately, and the size of the needle-shaped foam breakers is determined by the size of the foam catcher.

5. The high-efficiency foaming foam separation device according to claim 1, characterized in that: The foam distillation tower body is cylindrical, the top foam outlet is connected to the liquid outlet of the supergravity rotating packed bed, the gas blown out by the fan enters the tower from the gas inlet, and a gas distributor is provided above the gas inlet; the residual liquid outlet is provided on the side of the bottom of the tower and is connected to the residual liquid collection tank.

6. The high-efficiency supergravity foaming separation device according to claim 1, characterized in that: The filler of the high-gravity rotating packed bed is at least one or more combinations of ball ring filler, wire mesh filler, spherical filler, and arc saddle filler.

7. The high-efficiency supergravity foaming separation device according to claim 1, characterized in that: The height-to-diameter ratio of the foam distillation tower and the foam stripping tower ranges from 5 to 50.

8. A method for separating foam by high-efficiency foaming under high gravity, using the foam separation device according to any one of claims 1 to 7, characterized in that: In the high-efficiency foaming foam separation device, the raw material liquid is foamed by the high-gravity rotating packed bed to generate foam phase and liquid phase. The foam phase enters the foam distillation tower through the foam outlet of the rotating packed bed, and the high-concentration target substance is collected at the top of the foam distillation tower; The liquid phase enters the foam distillation tower due to gravity for further foam separation, and the remaining liquid phase components are obtained at the bottom of the foam distillation tower.

9. The foam separation method of high-efficiency foaming under high gravity according to claim 8, characterized in that The following steps are involved: (1) The raw material liquid is placed in the raw material liquid storage tank, and the supergravity rotating packed bed is started. The liquid in the raw material liquid storage tank is pumped into the supergravity rotating packed bed from the liquid inlet through the liquid delivery pipe, and is sprayed radially through the inner edge of the packing by the liquid distributor. At the same time, the fan is started to blow in gas, which passes through the gas buffer tank and adjusts the gas flow meter. When the gas velocity tends to be stable, the gas is divided into two paths and enters the foam distillation tower and the supergravity rotating packed bed respectively. One gas pipeline enters the foam distillation tower from the gas inlet through the gas distributor and rises to the rotating packed bed. The other gas pipeline enters the supergravity rotating packed bed from the gas inlet. Then the two gas streams are collected in the rotating packed bed. (2) The raw material liquid and gas are fully contacted in the rotating packed bed, generating a large number of evenly distributed submillimeter microbubbles. Under the action of centrifugal force, the bubbles are thrown between the outer edge of the packing and the inner wall of the shell. Due to the action of gas pressure, the bubbles enter the foam distillation tower from the foam outlet to realize the foam separation process. The foam enters the foam catcher through the overflow shield. Most of the bubbles form defoaming liquid in the foam catcher through the ultrasonic rod or needle-shaped bubble breaker; the diversion ratio of the reflux liquid and the defoaming liquid is controlled by adjusting the opening of the diversion valve on the liquid outlet pipe of the foam catcher. Among them, a part of the defoaming liquid enters the defoaming liquid collection tank, and the other part of the defoaming liquid is introduced into the foam distillation tower from the side port of the foam distillation tower as reflux liquid; (3) During the foam separation process, the foam interstitial liquid and reflux liquid flow into the supergravity rotating packed bed due to gravity and are discharged through the liquid outlet and transferred to the foam distillation tower. The continuously rising gas and liquid realize foam separation again. The foam is transferred into the supergravity rotating packed bed again under the action of the gas and finally returns to the foam catcher. When the foam no longer overflows, the valve of the reflux pipe is closed and all the remaining defoaming liquid is transferred to the defoaming liquid collection tank. The residual liquid in the foam distillation tower is introduced into the residual liquid collection tank and the residual liquid is finally collected.

10. The foam separation method of high-efficiency supergravity foaming according to claim 9, characterized in that: The gas-liquid contact mode is one of cross-flow, counter-flow or co-flow, the hypergravity factor is 5-120; the gas is at least one or more of air, carbon dioxide, nitrogen, oxygen or inert gas.

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