1417 results about "Deep eutectic solvent" patented technology

A ternary deep eutectic solvent (TDES) system for a biomolecule (for example, chitin) recovery from a biomass (for example, seafood waste), and the method of preparation of ternary deep eutectic solvent (TDES) system, and a process to differentiate / extract / recover biomolecules (such as chitin) from a biomass (such as seafood waste).

A transistor that has a capacitance that varies in response to pressure includes a gel coupled to a gate thereof. The gel comprises a eutectic mixture having ionic conductivity.

According to the preparation method of the Huangshan pine needle polyphenol and the acne-removing and inflammation-diminishing essence, the Huangshan pine needle polyphenol is prepared by adopting a microbial solid fermentation method, release of soluble polyphenol substances in Huangshan pine needles is remarkably promoted, and compared with an unfermented group, the polyphenol content of pine needles reaches up to 146.32 + / -2.53 mg / g and is increased by 1.89 times. The pine needle polyphenol component is prepared by adopting ultrasonic-assisted deep eutectic solvent extraction, membrane filtration and separation and purification technologies, the method has the advantages of short extraction time, low extraction temperature, environmental friendliness and the like, the structural integrity of pine needle polyphenol is maintained to the greatest extent, and the antibacterial activity of polyphenol is remarkably improved. The acne-removing and inflammation-diminishing essence containing the Huangshan pine needle polyphenol is soft in formula and high in safety, has remarkable dual effects of moisturizing and acne removing, can effectively inhibit skin inflammation, promote repair of acne skin, maintain the health state of the skin and meet the requirements of people, and can be widely applied to the field of skin care products.

The invention relates to the technical field of biological extraction, in particular to a green synergistic extraction system and an extraction method and application thereof.The green synergistic extraction system comprises a deep eutectic solvent system, an enzymolysis system and an ultrasonic-assisted extraction system, and the deep eutectic solvent system comprises a DES solvent; the DES solvent is composed of a hydrogen bond acceptor and a hydrogen bond donor, and the hydrogen bond acceptor is choline, choline chloride or L-proline; the hydrogen bond donor is lactic acid, urea or ethylene glycol; enzyme preparations in the enzymolysis system are at least two of cellulase, pectinase and beta-glucosidase; the problems that a traditional organic solvent is high in toxicity and poor in biodegradability and synthetic deep eutectic solvent raw materials are non-renewable are solved, a green synergistic extraction system which is environmentally friendly, low in cost and excellent in performance is developed, the mass transfer efficiency and the extraction yield are improved, the used DES and enzyme preparations can be recycled, and the cost is reduced while the environment is protected.

The invention relates to the technical field of mesoporous carbon material preparation, in particular to a high-temperature mesoporous carbon preparation method which comprises the following steps: S1, mixing a metal halide and an inorganic hydrogen bond donor, and heating and stirring until a solution is clear to obtain an inorganic eutectic solvent; s2, mixing the inorganic eutectic solvent and a biomass raw material for reaction; s3, filtering and washing the material obtained in the step S2; and S4, carbonizing the material obtained in the step S3 in a high-temperature inert atmosphere to obtain the high-temperature mesoporous carbon. According to the method, the wood fiber biomass such as the lowest-value straw, the lowest-value bamboo and the lowest-value wood dust is directly used as raw materials, component separation does not need to be conducted on the wood fiber biomass, and high-value utilization of a large amount of low-value wood fiber biomass can be achieved. The method is relatively simple in process, relatively mild in condition and relatively high in product yield, and an activating agent does not need to be used. The biomass mesoporous carbon prepared by the method also has a high specific surface area in a huge mesoporous volume state, and the specific capacitance in an alkaline electrolyte exceeds 260F / g.

The invention relates to the technical field of fiber product treatment, and discloses a low-energy-consumption rapid chemical separation method for polyester cotton fiber products. The method comprises the following steps: mixing and dissolving a hydrogen bond donor and a hydrogen bond acceptor to prepare a betaine-based eutectic solvent, and mixing the betaine-based eutectic solvent with alkali liquor to obtain a eutectic solvent / alkali composite system; immersing the polyester-cotton product in the deep eutectic solvent / alkali composite system for dissolution reaction, filtering after the reaction is finished, taking undissolved components in the polyester-cotton product, washing with water, and drying; according to the method, a betaine-based eutectic solvent / alkali composite system is adopted, polyester fiber components are dissolved in a mild condition within a short time, meanwhile, cotton fiber components are not damaged, the method has the advantages of being low in cost, environmentally friendly and the like, and rapid quantitative analysis of the polyester and cotton fiber components is achieved.

The invention relates to the field of building materials, and particularly discloses a coal gangue activation treatment method, prepared calcined coal gangue and application, the treatment method comprises the following steps: pretreatment: crushing and screening coal gangue to obtain coal gangue particles; the coal gangue particles are treated in a eutectic solvent, ultrasonic-assisted treatment is carried out for 2-3 h, pretreated coal gangue is obtained after water washing, the eutectic solvent comprises an HBA component and an HBD component, the HBA component is a mixture of choline chloride and an amide compound, and the HBD component is a mixture of a carboxylic acid mixture and polyhydric alcohol; calcining: calcining the pretreated coal gangue at 400-450 DEG C to obtain calcined coal gangue, the invention also discloses the calcined coal gangue prepared by the method, and the method has the characteristic of realizing coal gangue activation treatment under lower energy consumption.

The invention discloses a method for graded recovery of waste cotton-polyester blended fabrics by using a subcritical hydration deep eutectic solvent system, and belongs to the technical field of high-valued recovery and utilization of waste textiles. According to the method, cotton fibers in the waste cotton-polyester blended fabric can be efficiently converted into different sizes of cellulose forms (cotton staple fibers, MCC, CNC and CNF) by precisely regulating and controlling the technological process, meanwhile, it is ensured that polyester fibers are kept in the original state so as to be recycled, and a perfect subcritical hydration DES system cyclic utilization system is constructed; and the recovery cost is reduced, the recovery efficiency is improved, and the additional value of the recovered product is improved, so that the high-valued, green and efficient recycling of the waste cotton-polyester blended fabric is achieved.

The invention discloses deep eutectic gel polymer electrolyte as well as preparation and application thereof, belongs to the technical field of battery electrolyte, solves the problems of low thermal stability, low ionic conductivity and poor mechanical property in the prior art, and comprises a bimetallic salt-eutectic solvent and a polymer chain which are dynamically crosslinked and constructed, the bimetallic salt-eutectic solvent comprises lithium ions, heterogeneous metal salt and Lewis base, and the polymer chain is formed by free radical polymerization, atom transfer radical polymerization (ATRP) or reversible addition-fragmentation chain transfer radical polymerization (RAFT). According to the invention, the deep eutectic solvent is introduced as a reaction solution, so that the organic gel monomer is subjected to photopolymerization or thermal polymerization in the solution, the elongation at break can reach more than 500%, the organic gel has excellent mechanical stretchability, a polymer network is formed by utilizing a long-chain molecular formula of a polymer chain, the deep eutectic solution is wrapped in the polymer network, and the organic gel has excellent thermal stability; and the good ionic conductivity of the electrolyte is ensured.

The invention relates to the technical field of liquid-liquid homogeneous microextraction, in particular to a method for microextraction analysis of perfluorooctanoic acid by using a switchable eutectic solvent. Comprising the following steps: step 1, mixing a hydrogen bond acceptor and a hydrogen bond donor according to a set proportion value, and stirring and mixing at a set temperature value to obtain a eutectic solvent; step 2, filtering the water sample through a water-based filter membrane, then adding a set amount of deep eutectic solvent, dropwise adding an alkaline solution, carrying out full vortex mixing through a mixer, and then adding an acidic solution to form an emulsion; according to the method, the high selectivity of the green solvent with a specific structure on perfluorooctanoic acid and the characteristic that the solvent is switched between hydrophilic and hydrophobic forms are utilized, so that the microextraction time is shortened, and the impurity removal and enrichment effects are enhanced. The method is simple and convenient to operate, green, environment-friendly, low in cost and good in effect, has the advantage of efficiently and rapidly pretreating the batch small-size complex matrix sample, and has a relatively good application prospect.

The invention relates to a phellinus igniarius mycelium fermentation product and a preparation method and application thereof, and the preparation method comprises the following steps: inoculating a phellinus igniarius mycelium seed solution into a sterile fermentation culture medium for culturing, carrying out solid-liquid separation, filtering a clear liquid through a membrane and sterilizing to obtain the phellinus igniarius mycelium fermentation product, the fermentation medium comprises the following components: a beet extract, a deep eutectic solvent and water. The beet extract and the deep-eutectic solvent are creatively adopted as culture medium components to prepare the phellinus igniarius mycelium fermentation product, the beet extract and the deep-eutectic solvent jointly provide nutrients needed by phellinus igniarius fermentation, meanwhile, the deep-eutectic solvent is used for regulating metabolism, and compared with a product obtained through fermentation of a traditional culture medium, the phellinus igniarius mycelium fermentation product has the advantages that the fermentation efficiency is high; the content of active ingredients in a fermentation product obtained by adopting the culture medium with the formula is remarkably increased, and the fermentation product is good in uniformity and high in stability, is a clear liquid in appearance, has no abnormal odor and has slight phellinus igniarius characteristic odor.

The invention discloses a corn straw nanocellulose reinforced water-resistant fully-degradable mulching film and a preparation method thereof, and belongs to the technical field of agricultural mulching films. The method comprises the following steps: performing two-step DES treatment on corn straws to obtain a nano-cellulose dispersion liquid; a PVA solution with the concentration of 8-12 wt% is prepared; 1-3 wt% of an ultrasonic dispersion silicon source dispersion liquid is prepared; the preparation method comprises the following steps: adding 10 parts of PVA solution, 1.25 parts of silicon source dispersion liquid and 20 parts of glycerol into 100 parts of nanocellulose dispersion liquid to obtain film coating liquid, carrying out curtain coating in a polytetrafluoroethylene mold, and naturally drying to form the film. PVA has good film-forming property but poorer water resistance, and nano cellulose and nano silicon dioxide can be used as green modifiers to be blended with PVA and self-assembled to form a hydrogen bond cross-linking system, so that a'rigid cellulose and silicon dioxide network-flexible PVA matrix 'enhanced structure is formed. Meanwhile, forestry and agricultural residues (corn straw) are adopted as raw materials, nanocellulose is prepared through a two-step deep eutectic solvent (DES), and the problem of high pollution caused by traditional strong acid / strong alkali treatment is solved.

The invention provides loofah sponge nanocellulose hydrogel and a preparation method thereof.The preparation method comprises the following steps that anhydrous citric acid, choline chloride and water are mixed to react, and a ternary eutectic solvent is obtained; dispersing loofah sponge purified cellulose in a ternary eutectic solvent, washing and filtering a product to be neutral, dispersing the product in water, and performing ultrasonic treatment to obtain loofah sponge nanocellulose turbid liquid; dissolving sodium lignin sulfonate and lithium chloride in a sodium hydroxide solution to obtain a precursor solution; mixing the loofah sponge nanocellulose suspension with water, polyacrylamide, ammonium persulfate and N, N-methylene bisacrylamide, pouring the precursor solution into the loofah sponge nanocellulose suspension, uniformly stirring the mixture, pouring the mixture into a mold, and sealing the mold; and forming to obtain the loofah sponge nanocellulose hydrogel. The invention also provides an application of the hydrogel. The hydrogel disclosed by the invention has excellent biocompatibility, mechanical property and conductivity, has a wide application prospect in the field of flexible electronics, and is simple in preparation process, low in cost, green and environment-friendly.

The invention discloses a non-liquid-injection lithium iron phosphate battery positive electrode repairing method based on deep eutectic solvent stripping, which comprises the following steps: preparing a deep eutectic solvent: putting a collected non-liquid-injection lithium iron phosphate battery positive electrode plate into ethylene glycol or the deep eutectic solvent for heating and soaking; according to the method, the positive electrode material and the aluminum foil can be effectively stripped, meanwhile, the lithium loss generated in the stripping process is reduced, the service life of the positive electrode material is prolonged, the service life of the positive electrode material is prolonged, the service life of the positive electrode material is prolonged, and the service life of the positive electrode material is prolonged. And finally, repairing and reusing the obtained positive electrode material.

The invention belongs to the field of natural product extraction, and particularly relates to a method for extracting chitosan by using hermetia illucens in a high-valued manner. According to the method, the ionic liquid is introduced while the chitosan is extracted by adopting a deep eutectic solvent method, the deep eutectic solvent can form strong interaction with chitin molecules, the ionic liquid can further enhance specific recognition of the chitin molecules, and the ionic liquid and the deep eutectic solvent have a synergistic effect, so that solubility and recognizability of the chitin are improved; protein and salt are efficiently removed, meanwhile, glucosidic bonds of a chitin macromolecular main chain are prevented from being hydrolyzed and broken, and the extraction rate and purity of chitosan are remarkably improved. According to the method, the extraction condition is mild, the eutectic solvent can be recycled and reused, the extraction process flow of the chitosan is simplified, and the method is environment-friendly.

The invention belongs to the technical field of homogeneous derivatization of cellulose, and discloses a method for homogeneous synthesis of cellulose acetate from cellulose under catalysis of a eutectic solvent. The method comprises the following steps: dissolving cellulose in a deep eutectic solvent to form a homogeneous solution, adding an acylating agent, reacting, and adding an anti-solvent to obtain the cellulose acetate with the substitution degree of 0.42-1.81. According to the method for preparing the cellulose acetate, the solvent synthesis cost is low, the reaction condition is mild, an additional activation or hydrolysis process is not needed before and after the reaction, and the process is simple. The deep-eutectic solvent can be used as a reaction solvent and a reaction catalyst, and a new technology for homogeneous preparation of cellulose acetate is developed. The problems of high solvent cost, complex process operation, high chemical toxicity and high reaction condition requirement in preparation of cellulose acetate are solved.

The invention provides a method for extracting valuable metals in waste lithium ion batteries by using a deep-eutectic solvent and a method for regenerating a positive electrode material, which are used for extracting the valuable metals in the waste lithium ion batteries and regenerating the positive electrode material by using the deep-eutectic solvent with specific composition as a leaching agent. Comprising the following steps: preparation of a eutectic solvent, acquisition of a waste positive electrode material, leaching of valuable metals from the eutectic solvent, regeneration and recycling of the eutectic solvent, recovery of transition metal elements, recovery of a lithium element, re-preparation of the positive electrode material and the like. According to the method for extracting the valuable metal of the waste lithium ion battery through the eutectic solvent and the regeneration method of the positive electrode material, the high-temperature and long-time requirements of an existing eutectic solvent leaching process can be effectively met, and the subsequent metal recovery step is remarkably simplified and even reconstructed; and short-process, low-energy-consumption and low-cost closed-loop regeneration of the positive electrode material of the waste lithium ion battery is realized.

The invention belongs to the field of resource regeneration, and particularly relates to a method for separating and recycling copper, indium, gallium and selenium from a waste solar thin film battery. According to the method, the waste solar thin film cells are subjected to oxidizing roasting, deep eutectic leaching and extraction and reverse extraction, and high-quality conversion and purification of all valuable elements in the waste solar thin film cells to oxides of the valuable elements are achieved. According to the method, the process route is simple, high-selectivity extraction of indium is achieved through the synergistic effect of the deep eutectic solvent and P204, and meanwhile effective recovery of valuable elements such as copper and selenium is achieved. The recovered and prepared oxide can be widely applied to strategic emerging industries such as semiconductors, photovoltaics, aerospace, military and the like.

To provide a method for producing an oleanolic acid-containing extract which enables easy production of an oleanolic acid-containing extract from grape pomace without the need of using high-concentration organic solvents.SOLUTION: This method includes: a first step of preparing a mixed solution containing a natural deep eutectic solvent with sugar beet-derived betaine as the hydrogen bond acceptor and grape pomace; and a second step of deriving an extract containing an oleanolic acid from the mixed solution prepared in the first step.SELECTED DRAWING: None

Methods for processing a lignocellulosic biomass are provided and include the steps of: combining the lignocellulosic biomass with a hydrophobic deep eutectic solvent (HDES); heating a mixture including the lignocellulosic biomass and the HDES; and separating the mixture into a HDES phase including a first constituent of the lignocellulosic biomass, an aqueous phase including a second constituent of the lignocellulosic biomass, and a solid-residue phase including a third constituent of the lignocellulosic biomass. Water is added to the combination of the lignocellulosic biomass and the HDES, either before or after heating. An acidic additive can be added prior to heating the mixture including the lignocellulosic biomass and the HDES, or a ternary HDES including an acidic compound can be utilized, to further promote dissolution of the lignocellulosic biomass prior to heating.

The invention discloses a method for extracting curcumin from turmeric, which comprises the following steps: adding a deep eutectic solvent solution into turmeric powder, adding pectinase, uniformly mixing, adding terpilenol, performing magnetic stirring extraction and centrifugation, and taking an upper solution, thereby obtaining the curcumin. According to the method, a solvent system combining a deep eutectic solvent (DES), pectinase and terpilenol is adopted, extraction and enrichment of curcumin in turmeric can be achieved through a simple one-step method, the process is greatly simplified, recycling and reutilization of reagents are achieved, and compared with an existing extraction method, the extraction method has the advantages of being easy to operate, green, environmentally friendly, high in yield and the like. The method is short in extraction time, low in production cost and suitable for large-scale industrial production.

The invention discloses hydrophobic aerogel containing carboxyl nanocellulose and xanthan gum as well as a preparation method and application of the hydrophobic aerogel. The preparation method comprises the following steps: mixing cellulose and an acidic deep-eutectic solvent, performing water bath treatment, and stirring in distilled water through a wall breaking machine; mixing the nanocellulose suspension and the xanthan gum solution in equal mass, and uniformly stirring to obtain composite hydrogel; pre-freezing the composite hydrogel in an ultralow-temperature refrigerator, and performing vacuum freeze drying through a freeze dryer to obtain composite aerogel; spraying wax emulsion on the obtained composite aerogel, and drying to obtain the hydrophobic aerogel. The invention provides the hydrophobic aerogel containing the carboxyl nano cellulose and the xanthan gum, which is safe and environment-friendly, has good hydrophobic performance, adsorption performance and mechanical performance, can be directly used for food, and can be used for preparing an oil absorption pad and an oil absorption film.

The invention discloses a method for extracting macadamia nut green peel polyphenol by screening a deep eutectic solvent (DES) based on molecular simulation, and belongs to the field of molecular simulation and natural product extraction. The method comprises the following steps: firstly, quantitatively analyzing the composition of the macadamia nut green peel polyphenol, then based on the composition of the green peel polyphenol, researching the dissolving-out capacity of DES composed of different hydrogen bond donors / hydrogen bond receptors on the main polyphenol of the macadamia nut by adopting molecular simulation, screening DES with different hydrogen bond donor / hydrogen bond receptor compositions and molar ratios, and determining the content of the main polyphenol in the macadamia nut. Finally, the screened DES system is subjected to process optimization, and the optimal DES proportion is obtained. The DES system can be rapidly screened on the basis of the main composition of macadamia nut green peel polyphenol, the polyphenol yield is increased, and the problems of large use amount of an organic solvent and low extraction efficiency in traditional polyphenol extraction are solved.

The invention discloses a natural eutectic solvent enhanced konjac glucomannan film as well as a preparation method and application thereof, and belongs to the technical field of food packaging. The konjac glucomannan film enhanced by the natural deep eutectic solvent, provided by the invention, comprises konjac glucomannan, the natural deep eutectic solvent and gallic acid modified MXene nanoparticles; the mass ratio of the konjac glucomannan to the natural eutectic solvent to the gallic acid modified MXene nanoparticles is (850 to 950) to (50 to 250) to (10 to 40). Through the synergistic effect of all the components, the defects that KGM is insufficient in intrinsic mechanical strength, weak in antibacterial and antioxidant performance and poor in moisture resistance are overcome, the comprehensive performance of the film is remarkably improved, and the film can be used for cold-chain packaging of high-value fresh food and has environment friendliness and functional practicability.

The invention relates to the technical field of polyester fiber modification, and particularly discloses a large polyester bio-fiber containing a lavender active component and a preparation method of the large polyester bio-fiber containing the lavender active component. Comprising the following raw materials in parts by weight: 100-300 parts of polyester chips, 5-10 parts of lavender active ingredients, 10-20 parts of modified mica sheets, 10-20 parts of a coupling agent and 1-3 parts of a dispersing agent, besides, the lavender leaves are subjected to enzymolysis through the compound enzyme, then the deep-eutectic solvent is adopted for extraction, and the two steps are combined, so that active ingredients in the lavender leaves can be fully extracted. The polyester fiber provided by the invention has excellent aging resistance and antibacterial performance, and has a wide market prospect.

The invention discloses a method for purifying a carbon nano tube by using a deep eutectic solvent. The method comprises the following steps: drying carbon nanotube powder prepared on a supported catalyst by adopting a chemical vapor deposition method; the method comprises the following steps: mixing a hydrogen bond donor and a hydrogen bond acceptor according to a fixed molar ratio, and stirring at a set temperature to obtain a homogeneous eutectic solvent; adding the dried carbon nanotube powder into a deep-eutectic solvent, and dissolving the supported catalyst particles by regulating and controlling the temperature and the time; and carrying out vacuum filtration, cleaning and drying treatment on the reacted liquid to obtain the high-quality carbon nanotube. Compared with a traditional strong acid purification process, the method has the advantages of being simple, environmentally friendly, low in cost and the like, the intrinsic structure and surface characteristics of the carbon nanotubes can be effectively kept, and the method has important industrial application prospects.

The invention discloses a method for recovering valuable metals in a retired ternary lithium battery based on cascade separation of a deep eutectic solvent and oxalic acid. The method comprises the following steps: 1) stirring and leaching the deep eutectic solvent and black powder at 110-130 DEG C for 3-4 hours according to a liquid-solid ratio of (5-50): 1 (ml: g) to obtain a leaching solution; (2) measuring the contents of lithium, cobalt, nickel and manganese in the leachate according to ICP (Inductively Coupled Plasma), adding oxalic acid exceeding the required amount according to the contents of lithium, cobalt, nickel and manganese, stirring, standing, and centrifuging to obtain a precipitate mixture of nickel oxalate precipitate, cobalt oxalate precipitate and manganese oxalate precipitate and lithium filtrate; and (3) repeating the steps (1)-(2) for at least three times by taking the lithium filtrate obtained at each time as the eutectic solvent, performing rotary evaporation on the obtained final lithium filtrate, adding sodium carbonate, and centrifuging to obtain lithium carbonate precipitate. The purity of the ternary lithium precursor prepared from cobalt, nickel and manganese obtained through the method can reach 99% or above, the purity of obtained lithium carbonate reaches 95% or above, and closed-loop recycling is achieved.

The invention relates to the technical field of plant effective component extraction, in particular to a deep-eutectic solvent and application thereof, and the deep-eutectic solvent is composed of anhydrous betaine, DL-malic acid and deionized water. The eutecticevaporate solvent is applied to extraction of momordica grosvenori polysaccharide, ultrasonic waves are combined with the eutecticevaporate solvent, in addition, extraction conditions of crude momordica grosvenori polysaccharide are optimized, and a new method is provided for efficient and green extraction of momordica grosvenori polysaccharide. The new method not only expands the application range of DESs in natural product extraction, but also provides important technical reference for industrial development of momordica grosvenori polysaccharide.

The invention discloses a method for efficiently leaching valuable metals from a waste lithium battery positive electrode material based on a deep eutectic solvent, and belongs to the technical field of waste lithium battery recovery. The method comprises the following steps: leaching the positive electrode material separated from the waste lithium battery by adopting a deep eutectic solvent (EDSs, including ethylene glycol and tetracarboxylphenyl porphyrin compounds), filtering and separating, taking a leaching solution as a lithium-containing ethylene glycol solution, taking a solid as a nickel-cobalt-manganese porphyrin complex, and taking the nickel-cobalt-manganese porphyrin complex as a cathode material. According to the method, leaching of valuable metals such as nickel, cobalt, manganese and lithium in the positive electrode material and separation of nickel, cobalt, manganese and lithium can be efficiently achieved through one-step leaching, no harmful chemical reagent is used in the leaching process, the treatment cost of industrial wastewater is not increased, the EDSs solvent can be recycled, the environmental pressure is relieved, and the cost is greatly reduced.

The invention discloses a method for extracting total flavonoids from Chinese redbud seeds, and belongs to the technical field of natural product extraction and separation. The method adopts a deep eutectic solvent (DES) as an extraction medium, and specifically comprises the following steps: mixing dried Chinese redbud seed powder with the DES, carrying out ultrasonic-assisted extraction, and then carrying out centrifugal separation; and purifying the extracting solution by using macroporous adsorption resin, and eluting by using distilled water and ethanol in sequence to finally obtain the total flavonoids. According to the invention, cyclic utilization of the DES solvent is innovatively realized, DES in the loading effluent and the distilled water eluent is recovered through evaporation, and the DES solvent can be repeatedly used for at least three times. Compared with a traditional ethanol reflux extraction method, the method has the remarkable advantages that the total flavone extraction amount is increased by 3 times, and the method is simple and convenient in operation process, high in safety, environment-friendly and low in cost. The method not only improves the extraction efficiency, but also meets the requirements of modern green processing, and provides a new technical approach for sustainable development of natural products.