89 results about "Deep eutectic solvent" patented technology

The application provides a kind of eutectic solvent and its preparation method and application, the eutectic solvent includes hydrogen bond donor compound and hydrogen bond acceptor compound, the structural formula of hydrogen bond donor compound is wherein, R1 and R2 independently selected from n-octyl or iso-octyl, the hydrogen bond acceptor compound includes tri-n-octyl phosphine oxide.The eutectic solvent can be efficiently extracted from the permanent magnet rare earth waste hydrochloric acid solution of transition metal, can reduce the use of a large amount of organic solvent in the traditional extraction process.

The application belongs to the technical field of gas separation and carbon dioxide capture absorbent, and discloses a guanidinium-based deep eutectic solvent absorbent suitable for a wet environment, a preparation method thereof and CO2 capture application. The deep eutectic solvent takes 1-acetyl guanidine AG as a hydrogen bond acceptor and an alcohol amine compound as a hydrogen bond donor, and is formed into a uniform and stable liquid through heating and stirring. When the molar ratio of AG to MEA is 1:5.5 under the condition of 333.15 K and 1.0 bar, the system has a high CO2 absorption capacity, reaching 0.2278 g / g. When the water content is 10 wt%, the CO2 absorption capacity can be increased to 0.2456 g / g. The absorption rate is fast, and the absorption equilibrium can be approached in 20 min. The DESs have the characteristics of high CO2 absorption capacity, fast absorption rate, simple preparation method and good adaptability to a wet environment.

This invention discloses an electrolyte, its preparation method, and its application. The electrolyte comprises a deep eutectic solvent and an electrolyte salt. The deep eutectic solvent includes hydrogen bond acceptors and hydrogen bond donors, with a molar ratio of 1:(0.2-5). The electrolyte salt includes at least one of zinc, aluminum, magnesium, iron, calcium, manganese, cobalt, antimony, or bismuth salts. This electrolyte provides anions and cations that can act on the insertion and extraction of the positive electrode active material of the battery. The electrolyte has a wide voltage range and is a novel electrolyte system using a deep eutectic solvent. When used in aqueous batteries (e.g., with a zinc-containing negative electrode), it can suppress the formation of zinc dendrites, resulting in dendrite-free aqueous batteries with fewer side reactions. The resulting batteries exhibit good cycle stability and high coulombic efficiency.

The application belongs to the technical field of starch chemical modification, and particularly relates to a preparation method of acetylated distarch phosphate. The method comprises the following steps: mixing starch with a deep eutectic solvent composed of choline chloride, glycerol and a small amount of water, adding a phosphate crosslinking agent and a delayed-release alkalizing agent for crosslinking reaction after pH adjustment, performing acetylation reaction by adding acetic anhydride or vinyl acetate after cleaning by alcohol solvent replacement, and finally obtaining the product through neutralization, washing, dehydration and drying. The process utilizes the deep eutectic solvent to control water activity and particle structure, and combines the slow-release alkali source to maintain a stable reaction environment, so that the crosslinking and acetylation are uniformly carried out, and the side reactions and residual salt load are effectively reduced. The obtained acetylated distarch phosphate has stable substitution degree, uniform particle structure and excellent performance in freeze-thaw stability, and is suitable for multiple fields such as papermaking, textile and oil field additives.

This invention discloses a small-molecule soybean peptide, its preparation method, and its applications. The preparation method includes: mixing soybean protein isolate with water and then performing pH shift pretreatment, deep eutectic solvent pretreatment, and pulsed electric field pretreatment; subsequently, enzymatic hydrolysis, enzyme inactivation, centrifugation, and collection of the supernatant; then, performing a two-step fractional alcohol precipitation treatment on the supernatant, collecting the precipitate, reconstituteing, and freeze-drying to obtain the small-molecule soybean peptide. This soybean peptide has a molecular weight <1 kDa and a component content of over 94%, and can be used as a nitrogen source to replace soybean peptone in Bacillus subtilis fermentation medium. This small-molecule soybean peptide has a good yield-promoting effect on at least five Bacillus subtilis strains and can be used to promote the production of nattokinase by Bacillus subtilis biofilm fermentation, with the highest nattokinase activity reaching approximately 14800 U / mL.

The present application relates to the technical field of inorganic non-metallic powder material, and discloses a preparation method of micro-fine active calcium carbonate, which comprises the following steps: adding a calcium source and a surface modifier into a modified deep eutectic solvent containing choline chloride, urea and ammonium chloride, heating to form a homogeneous precursor solution; then, the solution is heated to make urea pyrolyze in-situ to generate calcium carbonate, and the surface modifier is coated synchronously; finally, the product is obtained through separation, washing and drying; by introducing ammonium chloride into the deep eutectic solvent to kinetically control urea pyrolysis, and combining with the construction of the homogeneous precursor, the present application realizes the synergistic control of calcium carbonate nucleation, growth and surface modification; the micro-fine active calcium carbonate prepared by the method has the beneficial effects of small particle size, uniform distribution, complete surface coating and excellent dispersion stability in organic medium.

The application provides a method for carbon dioxide capture and hydrogenation synthesis of methanol based on a eutectic solvent, and belongs to the technical field of carbon capture and utilization. The method comprises the following steps: weighing acetyl guanidine and ethylene glycol according to a proportion, mixing the acetyl guanidine and the ethylene glycol, stirring to prepare a eutectic solvent at a given temperature, capturing carbon dioxide in flue gas by using the eutectic solvent to form a rich liquid, transferring the rich liquid into a high-pressure reaction kettle, adding a catalyst, filling in hydrogen, increasing the temperature to perform a carbon dioxide hydrogenation reaction, filtering to obtain a catalyst and a mixture of the eutectic solvent and methanol after the reaction, and performing flash evaporation on the mixture to obtain product methanol and regenerated eutectic solvent. After capturing carbon dioxide in the flue gas, the method directly performs in-situ carbon dioxide hydrogenation in the absorbent to prepare methanol, avoids problems such as high energy consumption of carbon dioxide desorption, high reaction temperature and low single-pass conversion rate in a traditional gas-solid phase reaction process, and has a simple process and easy regeneration of the eutectic solvent.

This invention discloses a method for preparing a composite material from waste chrome-tanned leather scraps and its application, belonging to the field of solid waste resource utilization technology. The method first pre-treats the leather scraps with a deep eutectic solvent to modify them; then, it uses liquid nitrogen embrittlement to destroy the internal structure of the fibers, followed by directional ball milling in a specific pattern to refine the fibers while maintaining their structural integrity; finally, the treated leather scraps are mixed with a specially formulated styrene-butadiene rubber composite adhesive in a certain proportion, and then molded to obtain the composite material. This invention, through multi-stage processing, solves problems such as poor interfacial bonding between leather scraps and weakly polar adhesives, insufficient material flexibility, and poor air permeability and water absorption. The resulting composite material has suitable tensile strength, high elongation at break, excellent bursting properties, air permeability, and water absorption, making it suitable for the preparation of functional insoles, sports shoe midsoles, and medical linings that require high flexibility and comfort.

Provided are: an extractant with which one or more substances selected from among solutes and dispersed substances contained in lubricating oil compositions can be easily extracted; and an extraction method in which the extractant is used.　Specifically, the extractant comprises a deep eutectic solvent which is a product of mixing one or more nonionic hydrogen-bond donors with one or more nonionic hydrogen-bond acceptors. In the extraction method, the extractant is used.

This invention discloses a method for preparing capsaicin-like substances by temperature-responsive eutectic solvent extraction, comprising the following steps: drying Yunnan chili peppers (after removing stems and seeds), pulverizing, sieving, and collecting the chili powder; mixing lidocaine (HBA) with six alkane-chain carboxylic acids (valerate, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, and lauric acid) at a 1:1 molar ratio to form a homogeneous and transparent liquid, TRDES; weighing the chili powder, adding it to the TRDES aqueous solution, and extracting by shaking; after extraction, centrifuging, and diluting the supernatant to obtain capsaicin-like substances. This invention uses temperature-responsive eutectic solvent extraction to prepare capsaicin-like substances, which is simple, highly efficient, and allows for the recycling of extraction reagents, effectively saving resources. It has significant practical and industrial value for promoting the large-scale production of capsaicin-like substances and enhancing their high-value applications.

The embodiment of the present application provides a kind of strong adhesion deep eutectic gel for physiological electrical sensing and its preparation method, it is related to functional polymer materials and biomedical engineering technical field.Deep eutectic gel includes the following components by weight fraction: deep eutectic solvent 0.8-1.2 parts, N, N-dimethyl acrylamide 0.8-1.6 parts, allyl quaternary ammonium salt 0.03-0.12, catechol monomer 0.025-0.1 part, crosslinking agent 0.002-0.015 parts, initiator 0-0.015 parts.The strong adhesion deep eutectic gel for physiological electrical sensing of the embodiment of the present application, by deep eutectic solvent and each functional monomer using high molecular covalent crosslinking and hydrogen bond physical crosslinking synergistic effect, constructs three-dimensional network structure with high mechanical strength, excellent adhesion and high conductivity.

The present application belongs to the field of computational chemistry and molecular simulation technology, and relates to a kind of aromatic eutectic solvent multiscale molecular simulation screening method and system based on multi-objective collaborative scoring model.Establish target molecule model library and eutectic solvent candidate component library;Quantum chemistry calculation is carried out on target molecules and eutectic solvent candidate system, and quantum chemistry descriptors are extracted;Molecular dynamics simulation system is constructed, and molecular dynamics descriptors such as aromatic space enrichment coefficient Kπ, glycosidic bond interaction index Ggly and lignin bond type affinity index Lβ are extracted;Multi-scale feature vectors are obtained by normalization processing, input into multi-objective collaborative scoring model, calculate and extract score SE, grading score SF, and judge and output active ingredient extraction priority, lignocellulose grading priority or segmented collaborative processing mode.The present application is suitable for eutectic solvent calculation screening and application mode discrimination when there is a target conflict between plant aromatic active ingredient extraction and lignocellulose grading treatment.

The application discloses a method for separating and extracting xylanase based on a deep eutectic solvent (DES) and a two-water-phase system, and belongs to the technical field of biological separation engineering and enzyme purification. The method comprises the following steps: first, preparing a deep eutectic solvent by mixing and heating betaine (Bet) and 1,2-propylene glycol (1,2-Prop); second, mixing the deep eutectic solvent, inorganic salt and water in a certain proportion to build a two-water-phase system, wherein the mass percentage of the deep eutectic solvent is 40%, and the dosage of the inorganic salt is 0.2 g / mL; and third, adding a hydrolyzate containing xylanase into the two-water-phase system to perform extraction separation. The two-water-phase system formed by the deep eutectic solvent and the inorganic salt is used to selectively distribute the xylanase, the extraction rate can reach more than 90%, and the enzyme activity retention rate is greater than 85%. Compared with a traditional polymer two-water-phase system, the method has the advantages of high separation efficiency, mild conditions, small enzyme activity loss, low cost, green environmental protection, simple operation and the like, and is suitable for industrialized separation and purification of xylanase.

This invention discloses a method for synthesizing polyvinyl butyral resin, belonging to the field of polymer synthesis technology. The method includes the following steps: S1. Adding PVA powder to a deep eutectic solvent catalytic reaction medium and stirring until completely dissolved to form a transparent solution, obtaining a PVA-deep eutectic solvent solution. The catalytic reaction medium is a eutectic mixture formed by hydrogen bond donors and hydrogen bond acceptors through non-covalent bonding; S2. Under inert gas protection, the above PVA-deep eutectic solvent solution undergoes a condensation reaction with n-butyraldehyde. After the reaction, the reaction solution is poured into a large amount of deionized water to precipitate a white solid. After washing and drying, polyvinyl butyral resin is obtained. The synthesis method provided by this invention does not rely on strong protic acids, is green and environmentally friendly, and has a simple process. The final PVB resin has uniform particle size, excellent solubility in ethanol, and high transmittance, successfully achieving the goal of green, efficient, and high-quality synthesis of PVB resin.

This invention discloses a eutectic solvent and its ultrasonic method for extracting polysaccharides from evening primrose seeds, belonging to the field of polysaccharide extraction technology. The eutectic solvent comprises a hydrogen bond acceptor and a hydrogen bond donor in a molar ratio of 1:(1~2); the hydrogen bond acceptor is choline chloride, and the hydrogen bond donor is a single component or a two-component. The single component includes any one of glycerol, malonic acid, lactic acid, 1,3-butanediol, butylene glycol, D-sorbitol, citric acid, and ethanol; the two-component is 1,3-butanediol and butylene glycol in a molar ratio of 2:(0.5~1). This invention uses an ultrasonic method with a eutectic solvent to extract polysaccharides from evening primrose seeds. The eutectic solvent and evening primrose seed powder are mixed in a certain proportion, and the polysaccharide extract is obtained after ultrasonic extraction. This significantly improves the extraction rate of evening primrose seed polysaccharides and greatly enhances the resource utilization rate of evening primrose. Compared with water extraction, it has a lower extraction temperature, shorter extraction time, and higher extraction rate.

The application provides a method for recycling waste lithium battery black powder and regenerating a battery based on a eutectic solvent, a new green eutectic solvent is constructed from a polyol and a small-molecule organic acid, and a weak acid acid dissolution separation process is integrated, pretreated lithium battery black powder is subjected to leaching reaction in the new green non-aqueous eutectic solvent system, lithium elements in the black powder are selectively leached after the reaction, and a battery-grade lithium carbonate product is obtained by adding a sodium carbonate precipitant; after leaching, the mixture of residual nickel, cobalt and manganese and graphite is dissolved in dilute acid to realize efficient separation of nickel, cobalt, manganese and graphite, the graphite can be recycled and reused, and the dissolved nickel, cobalt and manganese solution is co-precipitated to form a positive electrode precursor; the precursor is calcined at high temperature to obtain a positive electrode intermediate, and finally, the prepared lithium carbonate and the intermediate are mixed, calcined at high temperature to obtain a regenerated positive electrode powder; the lithium battery assembled from the regenerated positive electrode powder exhibits excellent electrochemical performance. The application promotes the high-value recycling and utilization of waste lithium battery black powder.

The application discloses a method for preparing nanocellulose based on guanidinium sulfamate low eutectic solvent, and belongs to the field of modified nanocellulose materials. Firstly, in a certain temperature, water is used as a reaction medium, sodium periodate is used as an oxidant, and lithium chloride is used as a catalyst to oxidize cellulose into dialdehyde cellulose DAC. Secondly, a guanidinium sulfamate-choline chloride binary eutectic solvent or a guanidinium sulfamate-glycerol binary eutectic solvent is configured, and then DAC is added into the two kinds of eutectic solvents respectively. DAC is swollen in the two kinds of eutectic solvents and reacts with guanidinium sulfonic acid groups to graft guanidinium sulfonic acid groups. In the process, the cellulose is swollen in the solvent and the surface charge density is increased, which promotes the subsequent ultrasonic nanocrystallization process, and the guanidinium sulfonic acid group nanocellulose with high transparency and good flame retardant effect is successfully prepared. The application has the advantages of simple operation, low cost, effective reduction of energy loss in the nanocrystallization process of fibers, good flame-retardant modification effect on nanocellulose, environmental friendliness of the used eutectic solvent, and facilitation of industrial production and application of the guanidinium sulfonic acid group nanocellulose and guanidinium sulfonic acid group nanocellulose membrane.

The present application relates to a kind of containing deep eutectic solvent pesticide preparation and its preparation method.Deep eutectic solvent is formed by mixing hydrogen bond donor and hydrogen bond acceptor, and the hydrogen bond donor is salicylic acid etc.;The hydrogen bond acceptor is choline chloride etc..Pesticide preparation containing deep eutectic solvent has high active ingredient content, excellent solubility, excellent surface activity and rapid diffusion performance.At the same time, it shows significant leaf affinity, can be fully deposited and dispersed on plant leaves.

This invention relates to an in-situ polymerization method for preparing leather-based eutectic gels. The method uses acid-treated raw hides from the leather industry as raw materials. A deep eutectic solvent is prepared using choline chloride and glycerol in a molar ratio of 1:2. An impregnation solution consisting of monomers, an initiator, and the deep eutectic solvent is prepared. The acid-treated raw hides are placed in the impregnation solution and stirred at 10–30°C for 5–48 hours. Subsequently, the raw hides are heated at 40–70°C for 2–12 hours to obtain the leather-based eutectic gel. The leather-based eutectic gel prepared by this method inherits the original high mechanical strength and flexibility of animal hides, solving the problem of insufficient mechanical strength in traditional eutectic gels. It also retains the good conductivity and environmental stability of the deep eutectic solvent. The raw materials used in this preparation are natural, low in toxicity, biodegradable, inexpensive, green, and sustainable. The process is simple and easily industrialized.

This application relates to the field of cold cathode field emission material preparation technology, and discloses a method for preparing a graphene-diamond composite structure to improve the field emission performance of diamond. The method involves first dispersing nanodiamonds and graphene oxide in a deep eutectic solvent; then adding boric acid to induce an in-situ sol-gel transformation under heating, forming a gel network that locks the dispersed phase; followed by microwave-assisted interface activation and gradient high-temperature carbonization, and finally cleaning and drying to obtain the product. This invention effectively suppresses phase separation and agglomeration during pyrolysis through a gel solidification mechanism, and utilizes the deep eutectic solvent and boric acid pyrolysis to achieve in-situ co-doping of nitrogen and boron, constructing a low-barrier continuous conductive channel on the diamond surface, and realizing tight electrical interconnection between components. This method is simple and controllable, and the resulting composite material possesses excellent conductivity, low turn-on electric field, and high emission stability, thus improving the electron emission efficiency of cold cathode devices.

The present application relates to natural product separation and extraction technical field, specifically disclose a kind of method for separating and extracting astaxanthin with haematococcus pluvialis as raw material, comprising the following steps: (1) haematococcus pluvialis pretreatment preparation haematococcus pluvialis dry powder;(2) using ultrasonic-assisted natural deep eutectic solvent separates and extracts astaxanthin from haematococcus pluvialis dry powder and obtains crude extract;(3) using macroporous resin dynamic adsorption crude extract and purifying and collecting astaxanthin eluate;(4) astaxanthin eluate is concentrated by rotary evaporation under reduced pressure, freeze-dried, and astaxanthin crystal powder is obtained.The method provided by the present application effectively improves the extraction rate of astaxanthin by the ternary synergy of natural deep eutectic solvent, the trans-phase antioxidant synergy of tocopherol and ascorbyl palmitate, and the mild process of ultrasonic-assisted extraction and resin gradient elution, maintains the purity of astaxanthin and the proportion of all-trans astaxanthin, and prolongs the antioxidant retention time of astaxanthin.

This invention belongs to the field of lignin high-value utilization technology, and discloses a method for reducing the color of lignin using an acidic eutectic solvent in combination with a monohydric alcohol. The invention involves mixing an acidic eutectic solvent and a monohydric alcohol to obtain a mixed solvent; then reacting lignin in the mixed solvent; and finally precipitating it with water to obtain a light-colored lignin. The lignin color reduction method provided by this invention achieves lignin lightening while preserving the benzene ring structure of the lignin core, thus expanding the application scenarios of lignin.

The application provides a method for separating and recovering elemental sulfur in coked sulfur paste, comprising the following steps: obtaining a deep eutectic solvent, the deep eutectic solvent being obtained by mixing a first solvent and a second solvent, the first solvent being a compound with a structure of formula I or formula II, and the second solvent being a compound with a structure of formula III or a C5-C17 alkyl derivative thereof; using the deep eutectic solvent to extract the pretreated coked sulfur paste, collecting the filtrate; performing crystallization treatment on the filtrate, and performing solid-liquid separation to obtain elemental sulfur and recover the deep eutectic solvent. The deep eutectic solvent system formed by natural biodegradable components is constructed, the synergistic effect of low volatility, high stability and high solubility of the deep eutectic solvent is utilized, and the efficient and selective extraction of elemental sulfur in the coked sulfur paste is realized; in combination with the cooling crystallization and solvent recycling, the sulfur recovery rate and product purity are significantly improved, and a green, efficient and recyclable new way for clean resource utilization of sulfur-containing solid waste is provided.

This invention relates to a method for preparing a leather-based eutectic gel based on chrome-tanned leather blanks. The method uses chrome-tanned leather blanks as raw materials, prepares a deep eutectic solvent using choline chloride and glycerol in a molar ratio of 1:2, and prepares an impregnation solution composed of monomers, an initiator, and the deep eutectic solvent. The chrome-tanned leather blanks are placed in the impregnation solution and stirred at 5–30°C for 4–48 hours. Subsequently, the chrome-tanned leather blanks are heated at 45–95°C for 1–12 hours to obtain the leather-based eutectic gel. The leather-based eutectic gel prepared by this method inherits the excellent mechanical strength of chrome-tanned leather blanks and further enhances the mechanical properties of the eutectic gel by forming an interpenetrating network structure with the original collagen fiber three-dimensional network in the chrome-tanned leather blank through a polymer three-dimensional network, thus effectively solving the defect of insufficient mechanical strength in traditional eutectic gels. The raw materials of this invention are readily available and inexpensive from the leather and chemical industries, and the preparation process is simple and easy to industrialize.

This invention discloses a floral-scented composite matcha powder and its preparation method, belonging to the field of food processing technology, including the following steps: (1) preparing a natural deep eutectic solvent, wherein the natural deep eutectic solvent contains hydrogen bond acceptors and hydrogen bond donors; (2) mixing matcha powder, floral fragrance source and natural deep eutectic solvent, stirring and extracting at 30-70℃, so that the aroma components in the floral fragrance source dissolve in the natural deep eutectic solvent and are adsorbed by the matcha powder; (3) solid-liquid separation, collecting the solid part; (4) drying, to obtain floral-scented composite matcha powder. This invention simultaneously completes the extraction of floral fragrance components and the adsorption and compounding of matcha powder, simplifying the process flow. The low-temperature operation throughout protects the heat-sensitive aroma components and matcha color, requires no organic solvent, has high product safety, and the natural deep eutectic solvent can be recycled and reused. This invention can select different floral fragrance sources such as gardenia, cherry blossom, and bamboo leaves to prepare floral-scented composite matcha powders with various flavors.

The application discloses a natural deep eutectic solvent combined with a static magnetic field assisted freezing method and application thereof. The natural deep eutectic solvent is prepared by taking trehalose as a hydrogen bond donor and proline as a hydrogen bond acceptor, and the water content is 20% (w / w). The natural deep eutectic solvent is added to aquatic products, and then the aquatic products are frozen at 35 DEG C under the condition of a 60 mT static magnetic field. Through the synergistic effect of the hydrogen bond network of the natural deep eutectic solvent and the static magnetic field, the freezing denaturation of protein in the aquatic products can be significantly inhibited, and the myofibrillar protein structure can be maintained. Meanwhile, the water retention capacity of the aquatic products is effectively improved, the thawing loss is reduced, and the water holding capacity is improved. The aquatic products prepared by the method have excellent freeze-thaw stability. Therefore, the method has a good application prospect in the field of aquatic product freezing and preservation.

The present application relates to the technical field of lutein extraction, and provides a green extraction method of lutein from marigold, which comprises the following steps: mixing marigold dry flower particles with deionized water to prepare slurry, and performing high-pressure homogenization treatment to obtain pretreated slurry; mixing the pretreated slurry with a deep eutectic solvent (DES) and performing countercurrent extraction under the protection of inert gas to obtain DES extraction liquid after filtration; preheating the DES extraction liquid and pumping it into a continuous flow fixed-bed enzyme reactor filled with immobilized lipase, and performing enzymolysis reaction under constant temperature to obtain an enzymolysis liquid; sequentially treating the enzymolysis liquid through a ceramic ultrafiltration membrane and a nanofiltration membrane; collecting the retentate of the nanofiltration membrane, adding preheated deionized water to the nanofiltration retentate, and performing low-temperature standing crystallization; and washing and vacuum freeze-drying the obtained crystals to obtain a lutein crystal product. Through the above technical scheme, the extraction rate of lutein is improved, and the problem of incomplete extraction caused by insufficient cell structure damage in the traditional extraction method is improved.

The application belongs to the technical field of resource utilization of waste lithium ion batteries, and discloses a method for recovering valuable metals from waste ternary lithium batteries based on a eutectic solvent. The method uses a eutectic solvent system of betaine hydrochloride-malic acid-water to simultaneously achieve the preliminary separation of lithium and manganese into the liquid phase and the precipitation of nickel and cobalt in the leaching stage. For the products after the preliminary separation, an extraction-back extraction process is used for purification: after the dissolution of the solid phase containing nickel and cobalt, the nickel and cobalt are co-extracted into the organic phase by using a thio-phosphinic acid extractant, and then by controlling the acidity gradient of the back extraction agent, cobalt salt products and nickel salt products are obtained by back extraction in steps; the lithium-rich manganese liquid phase is selectively extracted by using an acidic phosphorus extractant to separate lithium from manganese. The application combines leaching and precipitation integration with selective extraction technology, shortens the process flow, realizes the full-component high-purity recovery of valuable metals, and realizes the closed-loop utilization of leaching agents.

This invention relates to the field of natural product extraction and green chemistry, specifically to a method for extracting total flavonoids from Artemisia argyi based on a switchable deep eutectic solvent. The method includes the following steps: S1. Cleaning, drying, pulverizing, and sieving Artemisia argyi raw material to obtain Artemisia argyi powder; S2. Adding an alkaline solution to a hydrophobic deep eutectic solvent to obtain a hydrophilic deep eutectic solvent; S3. Adding the Artemisia argyi powder to the hydrophilic deep eutectic solvent in a specific ratio, ultrasonically extracting and separating, and collecting the supernatant to obtain an extract of total flavonoids from Artemisia argyi; S4. Slowly adding an acid solution to the extract of total flavonoids from Artemisia argyi, shaking and mixing, and centrifuging to obtain a mixed phase system. The upper layer is the hydrophobic deep eutectic solvent phase, and the lower layer is an aqueous phase containing total flavonoids from Artemisia argyi. The aqueous phase containing total flavonoids from Artemisia argyi is collected and freeze-dried to obtain a solid powder of total flavonoids from Artemisia argyi. This invention achieves efficient extraction of total flavonoids and solvent recycling through reversible solvent switching, and has the advantages of simple operation, rapid extraction, and environmental friendliness.