CN112827216B - Device and method for enhancing liquid-liquid extraction - Google Patents
Device and method for enhancing liquid-liquid extraction Download PDFInfo
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Abstract
The invention provides a device for enhancing liquid-liquid extraction, which comprises an injection part, a mixed extraction part and a separation part, wherein the injection part comprises a feed tee joint for extracting and feeding materials, a first port of the feed tee joint is used for feeding an extracted phase, and a second port of the feed tee joint is provided with an ejector for compressing and shearing the extracted phase to generate turbulent kinetic energy to inject the fed materials; the mixed extraction part comprises a mixer, the mixer comprises a cylindrical mixer shell, an inlet section and an outlet section are arranged at two ends in the mixer shell, and a spiral section and a reducer section which are used for strengthening the mixing of an extraction phase and an extracted phase and the extraction process are arranged between the inlet section and the outlet section. The invention also provides a method for enhancing liquid-liquid extraction by using the device, and the device and the method have the characteristics of small device volume, compact structure, high extraction efficiency and small using amount of an extracting agent, and are particularly suitable for liquid-liquid extraction processes in the fields of chemical industry, pharmacy, biology and the like.
Description
Technical Field
The invention belongs to the field of liquid-liquid extraction of chemical industry, pharmacy, biology and the like, and particularly relates to a device and a method for enhancing liquid-liquid extraction.
Background
Liquid-liquid extraction, which is a unit operation for transferring a substance from one solvent to another solvent by using the difference in solubility of the substance in the solvent, has important applications in the fields of petrochemical, pharmaceutical, biological and other industries, and is increasingly used in the reprocessing processes of nuclear fuels for metal extraction and nuclear power generation. The traditional extraction devices such as a mixing settling tank, a sieve plate extraction tower, a spray extraction tower, a rotary disc extraction tower and the like have wide application range, but have the defects of large occupied area and long retention time. In addition, because the traditional extraction technology is limited, liquid-liquid two phases cannot be fully mixed, the dosage of the extracting agent is huge due to insufficient mass transfer area, the dosage of the extracting agent is increased by 20 percent generally, and the extracting agent is not completely separated and difficult to regenerate. For example, in the raffinate oil washing process of an aromatic hydrocarbon extraction device, raffinate oil is pumped to a washing tower, the raffinate oil enters from the bottom of the tower and is fully contacted and washed with washing water injected from the top of the tower in the tower, sulfolane is extracted into a water phase, and water containing sulfolane is sent to a subsequent stripping tower from the bottom of the tower for stripping.
CN102179063A discloses a high pressure liquid-liquid extraction method, which increases the solubility of organic impurities in organic solvent during extraction by pressurizing the container to increase the extraction efficiency, but this method is only suitable for the occasion of small amount of extraction, and needs the pressure resistance of the extraction container, and cannot process continuous extraction in large scale; CN203281070U discloses a full-automatic, high-efficiency and low-emulsification liquid-liquid extraction device using rotation of a rotor and pumping circulation of a pump, but the device is only suitable for low-viscosity and low-emulsification extraction occasions, and has the disadvantages of low extraction efficiency and high energy consumption.
Disclosure of Invention
Aiming at the defects of large volume, low extraction efficiency and large consumption of extraction phase of the traditional sieve plate extraction tower, spray extraction tower and other extraction equipment, the invention provides a device and a method for enhancing liquid-liquid extraction, which utilize the dispersion of a spraying part and the enhanced mixing of a mixed extraction part to enhance the extraction effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for enhancing liquid-liquid extraction, the apparatus comprising a sparging section, a mixed extraction section connected to the sparging section, and a separation section, wherein
The injection part comprises a feed tee joint for extracting feed, and the feed tee joint comprises a first port, a second port and a third port, wherein the first port is used for feeding the phase to be extracted, and the second port is provided with an injector for feeding the phase to be extracted; the ejector comprises a cylindrical ejector shell with an opening at one side and a hemispherical structure at the other side, an inlet section of the ejector is arranged at one side of the opening of the ejector shell, a supporting structure, a flow guide structure and a thimble structure which are connected with one another are sequentially arranged in the ejector inwards along the inlet section, and an ejection opening is arranged at one side of the hemispherical structure of the ejector shell;
the mixed extraction part comprises a mixer, the mixer comprises a cylindrical mixer shell, a mixer inlet section and a mixer outlet section are arranged at two ends in the mixer shell, and a spiral section and a reducer section which are used for strengthening the mixing and extraction process of the extraction phase and the extracted phase are arranged between the mixer inlet section and the mixer outlet section.
According to the preferred embodiment of the invention, the supporting structure comprises a cylindrical supporting rod and a hollow-out supporting frame which is radially outward along the supporting rod and is connected with the supporting rod and the inner wall of the shell; the flow guide structure comprises a cylindrical flow guide section and a truncated cone-shaped flow guide section with gradually reduced diameter; the thimble structure is a cylindrical structure; the diameter of the jet orifice is 0.1-4.4 mm.
According to a preferred embodiment of the invention, the diameter of the inducer is D1; the length of the supporting rod is 1-6/5 of the diameter D1 of the inlet section, and the diameter of the supporting rod is 1/4-3/4 of the diameter D1 of the inlet section; the diameter of the cylindrical flow guide section is 1/2-3/4 of the diameter D1 of the inlet section, the length of the cylindrical flow guide section is 1/4-1 of the diameter D1 of the inlet section, and the bottom angle alpha of the truncated cone-shaped flow guide section is 30-50 degrees; the diameter of the ejector pin structure is 4/5-6/5 of the diameter of the jet orifice, and the distance between the ejector pin structure and the inlet of the jet orifice is 1-10 mm.
According to the preferred embodiment of the invention, a cylindrical supporting structure is arranged at the inner axis of the mixer, the spiral section and the reducing section in the mixer are of a repeating structure which is arranged in sequence, the repeating number n of the spiral section and the reducing section is the mixing stage number, and n is more than or equal to 1; the helical section comprising helical blades connected to the inner wall of the mixer housing and the support structure for generating a rotating turbulent flow field; the reducing section is of a structure with a gradually reduced inner diameter, the reducing angle beta is 3-15 degrees, and the reducing section is used for strengthening the crushing and dispersion of the extraction phase and further strengthening the extraction efficiency.
According to the preferred embodiment of the present invention, the mixer has an overall length of L, the helical section has a length of 1/8 n-1/2 n of the length L of the mixer, and the tapered section has a length of 1/8 n-1/2 n of the length L of the mixer.
According to a preferred embodiment of the invention, the separation section comprises a separator comprising a separator inlet on one side of the separator and a separator light phase outlet and a separator heavy phase outlet on the upper and lower ends, respectively, of the other side of the separator; the separator inlet is connected with the mixer outlet section; and a rectification module and a coalescence-separation module are sequentially arranged in the separator.
The invention also provides a method for enhancing liquid-liquid extraction by using the device, which comprises the following steps:
(1) passing the extracted phase into a first port of the injection section and the extract phase into an inlet section of an injector of the injection section;
(2) after the extraction phase entering the ejector is guided along the guide structure, the extraction phase is ejected from the ejection opening to be dispersed in the extracted phase through shearing and crushing between the thimble structure and the ejector shell to form premixed liquid;
(3) the premixed liquid enters a mixing extraction part, a rotating turbulent flow field is formed in a spiral section of a mixer, extraction phase liquid drops are continuously subjected to interface updating extraction, the particle size of the extraction phase liquid drops is further sprayed and crushed in a reducing section, and extraction is further enhanced;
(4) the mixed liquid after mixed extraction enters a separation part to separate an extraction phase and an extracted phase after extraction is finished.
According to a preferred embodiment of the invention, the extract phase is dispersed into droplets with a size of 20-200 μm after passing through said ejector and into droplets with a size of 3-50 μm after passing through said mixed extraction section.
According to the preferred embodiment of the invention, the extraction phase liquid drops generate revolution and autorotation under the rotational flow shearing action of the rotating turbulent field of the spiral section, and the autorotation speed reaches 8000-.
According to a preferred embodiment of the present invention, the injection part adopts a single injector or a plurality of injectors connected in parallel for adjusting the flow ratio of the extraction phase and the extracted phase according to actual requirements.
The invention has the beneficial effects that:
the invention provides a device and a method for strengthening liquid-liquid extraction by strengthening the mixing of an extraction phase and an extracted phase, wherein the device for strengthening liquid-liquid extraction comprises an injection part and a mixed extraction part, an injector of the injection part injects the extraction phase by compression shearing to contact and mix with the extracted phase, so as to play a role of premixing, a mixer of the mixed extraction part comprises a spiral section and a diameter-changing section, a rotating turbulent flow field is generated in the spiral section, liquid drops of the extraction phase revolve and rotate under the rotating turbulent flow field, the interface update rate of the liquid drops of the extraction phase is greatly improved, the extraction efficiency is strengthened, the diameter-changing section strengthens the crushing and dispersion of the extraction phase by a diameter-changing structure, the surface area of the extraction phase is improved, and the extraction efficiency is further strengthened. Compared with the traditional sieve plate and spray extraction tower, the device of the invention has the characteristics of small volume, compact structure, high extraction efficiency and small dosage of the extracting agent, and is particularly suitable for the liquid-liquid extraction process in the fields of chemical industry, pharmacy, biology and the like.
Drawings
FIG. 1 is a schematic view showing the construction of a spouting portion and an extracting and mixing portion according to the present invention;
FIG. 2 is a schematic diagram of an injector according to the present invention;
FIG. 3 is a cross-sectional view of a support structure for an injector in accordance with the present invention;
FIG. 4 is a schematic view of a flow directing structure and a thimble structure of an injector in accordance with the present invention;
FIG. 5 is a schematic diagram of the revolution and rotation of extract phase droplets according to the present invention;
FIG. 6 is a schematic view of the structure of a separation part according to the present invention;
FIG. 7 is a process flow diagram of enhanced liquid-liquid extraction in accordance with the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples. It is to be understood that the following examples are for illustrative purposes only and are not to be construed as limiting the scope of the present invention, and that certain insubstantial modifications and adaptations of the invention may be made by those skilled in the art based on the teachings herein.
Example 1
FIG. 1 is a device for enhancing liquid-liquid extraction according to the present invention, which comprises an injection part 1 and a mixed extraction part 2 connected to the injection part 1, wherein the injection part 1 comprises a feed tee 11 for extracting a feed material, the feed tee 11 comprises a first port 111, a second port 112 and a third port 113, the first port 111 is used for feeding an extracted phase, the second port 112 is provided with an ejector 12 for compressing and shearing the extracted phase to generate turbulent energy, and the turbulent energy is injected into the feed tee 11 through the ejector 12 to preliminarily mix the extracted phase and the extracted phase; the preliminarily mixed extraction phase and the extracted phase enter the mixed extraction part 2 through the third port 113; the mixing extraction part 2 comprises a mixer 21, the mixer 21 comprises a cylindrical mixer housing 211, a mixer inlet section 212 and a mixer outlet section 213 are arranged at two ends in the mixer housing 211, a spiral section 214 and a reducer section 215 for enhancing the mixing and extraction process of an extraction phase and an extracted phase are arranged between the mixer inlet section 212 and the mixer outlet section 213, and the third port 113 is connected with the mixer inlet section 212 through a flange.
Further, as shown in fig. 2, the injector 12 includes a cylindrical injector housing 121 with one side open and the other side in a hemispherical structure, an inlet section 122 of the injector 12 is arranged on one side of the opening of the injector housing 121, and the diameter of the inlet section 122 is D1; inside the injector 12, inward along the inlet section 122, a supporting structure 123, a flow guiding structure 124 and a thimble structure 125 are sequentially arranged, as shown in fig. 3, where the supporting structure 123 includes a cylindrical supporting rod 126 and a hollow supporting frame 127 radially outward along the supporting rod 126 and connected to the supporting rod 126 and an inner wall of the casing 121, a length L1 of the supporting rod 126 is 1-6/5 of a diameter D1 of the inlet section 122, and a diameter D2 of the supporting rod is 1/4-3/4 of the diameter D1 of the inlet section 122; the flow guiding structure 124 comprises a cylindrical flow guiding section 128 and a frustum-shaped flow guiding section 129 with a gradually reduced diameter, the diameter D1 of the cylindrical flow guiding section 128 is 1/2-3/4 of the diameter D1 of the inlet section 122, the length L2 is 1/4-1 of the diameter D1 of the inlet section 122, and as shown in FIG. 4, the bottom angle alpha of the frustum-shaped flow guiding section 129 is 30-50 degrees; the thimble structure 125 is a cylindrical structure; an injection port 13 is arranged on one side of the hemispherical structure of the injector housing 121, the diameter d3 of the injection port 13 is 0.1-4.4mm, the diameter of the thimble structure 125 is 4/5-6/5 of the diameter d3 of the injection port 13, and the distance between the thimble structure 125 and the inlet of the injection port 13 is 1-10 mm.
Further, returning to fig. 1, a cylindrical support structure 216 is arranged at the axis inside the mixer 21, the spiral section 214 and the reducer section 215 inside the mixer 21 are repetitive structures and are repeatedly arranged in sequence, the number n of repetitions of the spiral section 214 and the reducer section 215 is the mixing number of stages, and n is greater than or equal to 1; the spiral section 214 comprises spiral blades connected with the inner wall of the mixer housing 211 and the support structure 216, and is used for generating a rotating turbulent flow field, as shown in fig. 5, the revolution and rotation of the extraction phase liquid drops can occur under the rotating turbulent flow field, the interface update rate of the extraction phase liquid drops can be greatly improved, and thus the extraction efficiency is enhanced; the reducing section 215 is of a structure with a gradually reduced inner diameter, the reducing angle beta is 3-15 degrees, the reducing section 215 can strengthen the crushing and dispersion of the extraction phase through the reducing structure, the surface area of the extraction phase is greatly improved, and the extraction efficiency is further strengthened.
Further, the overall length of the mixer is L, the length L3 of the spiral section 214 is 1/8 n-1/2 n of the length L of the mixer, and the length L4 of the reducer section 215 is 1/8 n-1/2 n of the length L of the mixer.
Further, as shown in fig. 6, the apparatus for enhanced liquid-liquid extraction further comprises a separation part 3 for separating an extracted phase from an extracted phase after extraction is completed, the separation part 3 comprises a separator 31, the separator 31 comprises a separator inlet 32 at one side of the separator 31, and a separator light phase outlet 33 and a separator heavy phase outlet 34 respectively located at the upper end and the lower end at the other side of the separator 31, and the separator inlet 32 is connected to the mixer outlet section 213.
Further, a rectification module 35 and a coalescence separation module 36 are sequentially arranged in the separator 31, the rectification module 35 may be a corrugated plate for performing fluid rectification on the extraction phase and the extracted phase entering the separator 31, and the coalescence separation module 36 may be a structure having a coalescence separation function, such as the hydrophilic/hydrophobic combined fiber module described in the omega-type fiber weaving method for deep oil-water separation disclosed in invention CN 103952852B.
The method for enhancing liquid-liquid extraction using the above apparatus, as shown in fig. 7, comprises the steps of:
(1) the extracted phase is extracted from the extracted phase tank 4 through a booster pump 5 and a rotor flow meter 8 and enters a first port 111 of the injection part 1; extract phase is withdrawn from the extract phase tank 6 through the metering pump 7 and the first float flow meter 9 into the injector inlet section 122 of the injection section 1;
(2) after the extraction phase entering the ejector 12 is guided along the guide structure 124, the extraction phase is ejected from the ejection port 13 to be dispersed in the extracted phase through shearing and crushing between the thimble structure 125 and the ejector shell 121 to form a premix;
(3) the premixed solution enters the mixed extraction part 2, a rotating turbulent flow field is formed in the spiral section 214 of the mixer 21, extraction phase liquid drops revolve and rotate under the action of rotational flow shearing, the interface is continuously updated and extracted, the particle size of the extraction phase liquid drops is further sprayed and crushed in the reducing section 215, the surface area of the extraction phase is improved, and the extraction is further enhanced;
(4) the mixed liquid passing through the mixed extraction part 2 enters the separation part 3 through the second float flowmeter 10, and sequentially passes through the rectification module 35 and the coalescence separation module 36, the light phase is discharged from the light phase outlet 33 of the separator, and the heavy phase is discharged from the heavy phase outlet 34 of the separator, so that the extraction separation of the extraction phase and the extracted phase is realized.
Further, the extraction phase is dispersed into liquid drops with the particle size of 20-200 μm after passing through the ejector 12, and the liquid drops are dispersed in the extracted phase; the extract phase is further dispersed into liquid drops with the particle size of 3-50 mu m after being treated by the mixed extraction part 2.
Further, the autorotation speed of the extract phase droplets autorotation in the spiral section 214 reaches 8000-.
Further, according to the actual throughput, the injection part adopts a single injector 12 or a plurality of injectors 12 connected in parallel for adjusting the flow ratio of the extraction phase and the extracted phase according to the actual requirement.
Example 2
A certain chemical plant utilizes an extraction tower process to remove mercaptan from liquefied hydrocarbon, the extraction tower is a sieve plate tower with the diameter of 1m and the height of 15m, the existing process can not meet the treatment requirement along with the improvement of production capacity, and the phenomenon that liquefied gas at the top of the tower carries alkali often occurs. The device and the method of the embodiment 1 are adopted for replacing the liquefied hydrocarbon sweetening, wherein a single ejector is adopted in an ejection part, the whole length of a mixer of a mixed extraction part is 2m, the mixing stage number is 2, 5 devices described in the embodiment 1 are adopted for parallel treatment, and the treatment capacity can reach 25m3/h。
After transformation, the yield of the liquefied hydrocarbon for removing the mercaptan is increased from 14 ten thousand tons/year to 20 ten thousand tons/year, and the quantity of the imported mercaptan containing is 2000-2500mg/m3The amount of the thiol contained in the liquefied hydrocarbon treated by the prior art is 200mg/m3The amount of the thiol contained in the liquefied hydrocarbon obtained by the modification and post-treatment is 50mg/m3The treatment requirement of the process is met, the phenomenon that the liquefied hydrocarbon carries alkali is reduced, and the occupied area is greatly reduced.
Example 3
In this embodiment, the device and method described in embodiment 1 are used to extract ferric ions in an aqueous solution, wherein the extraction phase is an extractant prepared by mixing diphosphonate and sulfonated kerosene at a ratio of 3:7, and the extracted phase is an aqueous solution of ferric trichloride, wherein Fe is contained in the aqueous solution3+The concentration was 100mg/L while the pH was adjusted to 1.86. The spraying part adopts a single sprayer, the whole length of the mixer in the mixed extraction part is 60mm, the mixing stage number is 3, and the treatment capacity can reach 1m3/h。
Maintaining the flow ratio of the extracted phase to the extraction phase at 10:1, examining the extraction effect at different flow rates of the extracted phase, and measuring the residual Fe in water3+The concentration was evaluated for the extraction effect, and the results are shown in the following table, the extraction efficiency gradually increased with the increase of the flow rate of the extracted phase, and for the present example, the extraction efficiency reached 86% when the flow rate of the extracted phase reached 375L/h.
| Flow rate of extracted phase | 125L/h | 175L/h | 225L/h | 275L/h | 325L/h | 375L/h |
| Efficiency of |
35％ | 56％ | 72％ | 80％ | 85％ | 86％ |
Example 4
Because the crude oil contains corrosive media such as chloride, sulfide and the like, the salt formation corrosion phenomenon often occurs in a circulating oil system at the top of the fractionating tower. In the original flow, the extraction amount of the circulating oil at the top of the atmospheric fractionating tower of the atmospheric and vacuum distillation device is 593.96t/h, the extraction temperature at the top of the tower is 148 ℃, the return temperature of the circulating oil is 113 ℃, and the salt content of the circulating oil at the inlet of the device is 1.3mg NaCl/L.
In order to reduce the salt content in the top circulating oil, the device for enhancing liquid-liquid extraction described in example 1 is introduced into the process, water is injected to elute the top circulating oil, the sewage dissolved with salts is separated from an oil phase through oil-water separation, the desalted top circulating oil returns to the top circulating system of the fractionating tower, and the corrosion rate of the top circulating system of the whole tower is controlled at a lower level.
Before transformation, the salt content of the circulating oil at the top of the fractionating tower is 1.3mg NaCl/L, after the transformation, the salt content of the circulating oil at the top of the fractionating tower can be stably reduced to 0.5mg NaCl/L, the acidity value is also reduced to 18mg KOH/L from 40mg KOH/L, and the corrosion rate of the whole circulating system at the top of the fractionating tower is stably within 0.2 mm/a.
Claims (10)
1. An apparatus for enhanced liquid-liquid extraction, comprising a sparging section, a mixed extraction section connected to the sparging section, and a separation section, wherein
The injection part comprises a feed tee joint for extracting feed, and the feed tee joint comprises a first port, a second port and a third port, wherein the first port is used for feeding the phase to be extracted, and the second port is provided with an injector for feeding the phase to be extracted; the ejector comprises a cylindrical ejector shell with an opening at one side and a hemispherical structure at the other side, an inlet section of the ejector is arranged at one side of the opening of the ejector shell, a supporting structure, a flow guide structure and a thimble structure which are connected with one another are sequentially arranged in the ejector inwards along the inlet section, the flow guide structure comprises a cylindrical flow guide section and a truncated cone-shaped flow guide section with gradually reduced diameter, the thimble structure is a cylindrical structure, and a jet orifice is arranged at one side of the hemispherical structure of the ejector shell;
the mixed extraction part comprises a mixer, the mixer comprises a cylindrical mixer shell, a mixer inlet section and a mixer outlet section are arranged at two ends in the mixer shell, and a spiral section and a reducer section which are used for strengthening the mixing and extraction process of the extraction phase and the extracted phase are arranged between the mixer inlet section and the mixer outlet section.
2. The apparatus of claim 1, wherein the support structure comprises a cylindrical support bar and a hollowed-out support frame extending radially outward from the support bar and connected to the support bar and an inner wall of the housing; the diameter of the jet orifice is 0.1-4.4 mm.
3. The apparatus for enhanced liquid-liquid extraction according to claim 2, wherein the diameter of said inlet section is D1; the length of the supporting rod is 1-6/5 of the diameter D1 of the inlet section, and the diameter of the supporting rod is 1/4-3/4 of the diameter D1 of the inlet section; the diameter of the cylindrical flow guide section is 1/2-3/4 of the diameter D1 of the inlet section, the length of the cylindrical flow guide section is 1/4-1 of the diameter D1 of the inlet section, and the bottom angle alpha of the truncated cone-shaped flow guide section is 30-50 degrees; the diameter of the ejector pin structure is 4/5-6/5 of the diameter of the jet orifice, and the distance between the ejector pin structure and the inlet of the jet orifice is 1-10 mm.
4. The apparatus for enhanced liquid-liquid extraction as claimed in claim 1, wherein a cylindrical supporting structure is provided at the inner axial center of the mixer, the spiral section and the reducer section in the mixer are sequentially arranged and repeat structures, the number n of the repetition of the spiral section and the reducer section is the mixing series, and n is more than or equal to 1; the helical section comprising helical blades connected to the inner wall of the mixer housing and the support structure for generating a rotating turbulent flow field; the reducing section is of a structure with a gradually reduced inner diameter, the reducing angle beta is 3-15 degrees, and the reducing section is used for strengthening the crushing and dispersion of the extraction phase and further strengthening the extraction efficiency.
5. The apparatus of claim 4, wherein the mixer has an overall length L, the helical section has a length of 1/8 n-1/2 n of the length L of the mixer, and the reducer section has a length of 1/8 n-1/2 n of the length L of the mixer.
6. An enhanced liquid-liquid extraction apparatus according to claim 1 wherein the separation section comprises a separator comprising a separator inlet on one side of the separator and a separator light phase outlet and a separator heavy phase outlet on the upper and lower ends, respectively, of the other side of the separator; the separator inlet is connected with the mixer outlet section; and a rectification module and a coalescence-separation module are sequentially arranged in the separator.
7. A method for enhanced liquid-liquid extraction using the apparatus of any of claims 1 to 6, characterized in that the steps of the method are as follows:
(1) passing the extracted phase into a first port of the injection section and the extract phase into an inlet section of an injector of the injection section;
(2) after the extraction phase entering the ejector is guided along the guide structure, the extraction phase is ejected from the ejection opening to be dispersed in the extracted phase through shearing and crushing between the thimble structure and the ejector shell to form premixed liquid;
(3) the premixed liquid enters a mixing extraction part, a rotating turbulent flow field is formed in a spiral section of a mixer, extraction phase liquid drops are continuously subjected to interface updating extraction, the particle size of the extraction phase liquid drops is further sprayed and crushed in a reducing section, and extraction is further enhanced;
(4) the mixed liquid after mixed extraction enters a separation part to separate an extraction phase and an extracted phase after extraction is finished.
8. The method of claim 7, wherein the extract phase is dispersed into droplets having a size of 20-200 μm after passing through the ejector, and the extract phase is dispersed into droplets having a size of 3-50 μm after passing through the mixed extraction section.
9. The method for enhanced liquid-liquid extraction as claimed in claim 7, wherein the extract phase droplets are revolved and rotated under the rotational flow shearing action of the rotating turbulent field of the spiral section, and the rotation speed is 8000-16000 rad/s.
10. The method of claim 7, wherein the ejector section is a single ejector or a plurality of ejectors connected in parallel for adjusting the flow ratio of the extraction phase and the extracted phase according to actual requirements.
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