568 results about "Choline chloride" patented technology

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 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 relates to the technical field of bacterium enrichment nutrient solutions, in particular to a bacterium enrichment nutrient solution for fermentation and a preparation method of the bacterium enrichment nutrient solution. The culture medium is prepared from the following raw materials in parts by weight: maltodextrin, crystalline glucose, low-pigment yeast extract powder, refined soy peptone, dipotassium phosphate, monopotassium phosphate, magnesium sulfate heptahydrate, sodium chloride, phytic acid, L-ascorbic acid, manganese sulfate monohydrate, biotin, thiamine hydrochloride and choline chloride. Through a double-carbon-source structure, maltodextrin and crystalline glucose cooperate, metabolic oscillation is avoided, and the energy utilization rate is increased; the low-pigment yeast extract powder and the refined soy peptone are complementary, so that the rapid growth requirement of thalli is met; phytic acid is chelated with metal ions to prevent precipitation, L-ascorbic acid is used for resisting oxidation, and biotin and thiamine activate a coenzyme pathway to realize accurate regulation and control of a metabolic network.

The invention provides a lignin extraction-sulfonic acid modification integrated preparation method based on eutecticevaporate solvent coupling microwaves, lignin sulfonate and application, and belongs to the technical field of oilfield chemistry. The preparation method comprises the following steps: mixing choline chloride, epichlorohydrin and 4-hydroxybenzenesulfonic acid, heating and stirring to obtain a deep eutectic solvent ternary system; the method comprises the following steps: adding biomass powder into a deep eutectic solvent ternary system, and reacting under a microwave condition; after the reaction is completed, filtering, and adjusting the pH value of the obtained filtrate to be neutral to obtain a mixed solution; and then adding an organic solvent into the obtained mixed solution for precipitation, filtering, washing and drying to complete lignin extraction-sulfonic acid modification. According to the method, in-situ grafting of sulfonic acid functional groups is realized in the lignin separation process through the ternary eutectic solvent in combination with microwave-assisted extraction, so that sulfonation modification of lignin is completed. After sulfonation modification, the obtained sulfonated lignin is applied to the drilling fluid, and the viscosity reduction effect can be achieved.

The invention belongs to the technical field of medicines, and particularly relates to a composition for improving obesity and promoting cardiovascular health as well as a preparation method and application thereof. The composition is prepared from the following components in parts by weight: 5 to 20 parts of glycine betaine, 1 to 5.5 parts of choline chloride, 0.5 to 4 parts of L-theanine, 1 to 15 parts of alpha-ketoglutarate calcium, 0.5 to 3 parts of black ginger extract, 0.05 to 0.25 part of black pepper extract, 0.5 to 3 parts of ginkgo leaf extract and 1 to 6 parts of black garlic juice powder. According to the invention, the eight components are selected and are scientifically combined in an optimal quantity ratio range, and the prepared composition can better reduce the inflammation level of a body, regulate abnormal blood fat, improve the lipid metabolism disorder state and effectively reduce impulsive diet behaviors, so that comprehensive improvement of obesity and cardiovascular related risks is realized, and the health-care effect of a human body is improved. The body is effectively assisted to maintain metabolic health.

The present invention discloses a biomass-based ionic liquid-modified carbon quantum dots, a preparation method thereof, and a composite lubricant. The preparation method of the biomass-based ionic liquid-modified carbon quantum dots uses biomass raw materials, choline chloride, and amino acids to prepare carbon quantum dots and choline amino acid ionic liquid. The choline amino acid ionic liquid is used to modify the carbon quantum dots to produce a biomass composite lubricant. This uses renewable biomass resources instead of traditional petrochemical resources, is environmentally friendly, can be decomposed by nature, achieves clean production, and eliminates environmental pollution. The CQDs / ILs composite lubricant can function as "nanoballs," thereby improving its load-bearing capacity and reducing wear. In addition to having good lubricating properties, the choline amino acid ionic liquid also has good solubility. Modifying the carbon quantum dots with the choline amino acid ionic liquid not only improves the dispersibility of the carbon quantum dots but also further enhances their tribological properties.

The invention discloses diglyceride prepared by an enzymic method as well as a preparation method and application thereof, and belongs to the technical field of deep processing of grease. The method comprises the following steps: adding fatty acid into a choline chloride-glycerol-urea ternary eutectic solvent, uniformly mixing, and then adding candida antarctica lipase B for esterification reaction to obtain a reaction mixture; separating the reaction mixture, and recovering an upper-layer oil phase; and separating and purifying the upper-layer oil phase to obtain the diglyceride. According to the method, the reaction rate is high, the selectivity of the diglyceride in the esterification process is high, the yield of the diglyceride can reach 65% or above by reacting for 1 h, the selectivity of the diglyceride is 75% or above, and the purity of the separated and purified diglyceride is 90% or above; in addition, the method is simple to operate, and the reaction product and the eutectic solvent can be separated through simple centrifugation after the reaction is finished; in addition, the monoglyceride content in the product is low, and the subsequent separation and purification difficulty is greatly reduced.

The present invention provides a deep eutectic solvent and its preparation and application. The deep eutectic solvent comprises choline chloride, p-toluenesulfonic acid, 1,4-butanediol, and water; wherein the molar ratio of choline chloride, p-toluenesulfonic acid, and 1,4-butanediol is 1-2:3-6:2-8, and the ratio of the total mass of choline chloride and p-toluenesulfonic acid to the mass of water is 20:9-11. When used for the pretreatment of Miscanthus sinensis, the deep eutectic solvent of the present invention can effectively remove hemicellulose and lignin from the cell walls of Miscanthus sinensis, thereby significantly improving the efficiency of its enzymatic hydrolysis of cellulose.

The invention provides a method for extracting and separating a general flavone crude extract from paeonia lactiflora stems and leaves, which comprises the following steps: adding a choline chloride-malic acid eutectic solvent into paeonia lactiflora stem and leaf powder, soaking, carrying out ultrasonic treatment, carrying out suction filtration to remove solid impurities to obtain a paeonia lactiflora stem and leaf extracting solution, diluting with ultrapure water, carrying out electrodialysis treatment, and drying to obtain the general flavone crude extract. A solid-liquid mixture containing solid residues is obtained in the middle chamber, precipitates are reserved after centrifugation, and the total flavone crude extract is obtained after blow-drying. The invention also provides application of the extracted and separated total flavone crude extract in preparation of medicines, cosmetics or functional foods for antioxidation, anti-inflammation, anti-tumor, cardiovascular protection or / and immunoregulation. The method is high in separation speed, high in separation rate and environment-friendly, flavone loss can be reduced to the maximum extent, and the yield of the total flavone crude extract is 0.27%-0.39%.

The present application relates to a kind of ultra-low VOC water-based paint and its preparation method, belong to paint technical field, and paint component includes modified acrylic-polyurethane hybrid emulsion, methyl linoleate, choline chloride-glycerol complex, modified nano titanium dioxide photocatalyst, PEG-40 stearate, thickening agent, preservative, pH regulator etc..The present application is prepared by special method modified acrylic-polyurethane hybrid emulsion, modified nano titanium dioxide photocatalyst, then with methyl linoleate, PEG-40 stearate, choline chloride-glycerol complex and other additives are prepared according to certain proportion Cooperation preparation paint, with the effect of fast curing and not cracking, very low VOC volatility, and good water resistance and acid and alkali resistance, strong adhesion.

The invention provides a modification method for improving the size stability of rubber wood and a modified material and application thereof, and relates to the field of rubber wood processing. The modification method comprises the following steps: 1, mixing choline chloride with a hydrogen bond donor compound containing carboxyl to obtain a DES solvent, and adding water to obtain a DES solution; secondly, the rubber wood plate is put into the DES solution in the first step, pressurized dipping treatment is carried out, and then the rubber wood plate is taken out and aired; and thirdly, the rubber wood treated in the second step is placed at the temperature of 150-160 DEG C to be subjected to heat treatment for 1-2 h, and the rubber wood DES modified material is obtained and placed under the room temperature condition to be balanced. The modification method is simple and easy to operate, the hygroscopicity of the rubber wood is remarkably reduced, the dimensional stability of the rubber wood is improved, the modification liquid can be repeatedly used, and cost saving and efficiency increasing are achieved. The environment-friendly and performance bottlenecks of a traditional method are solved, a new way is opened up for efficient value-added utilization of rubber wood, and the strategic requirement of sustainable material development is met.

The invention relates to the technical field of biological extraction, in particular to a preparation method of selenium polysaccharide in cardamine violifolia, which comprises the following steps: extracting selenium polysaccharide in cardamine violifolia by using a deep eutectic solvent as an extraction solvent and adopting an ultrasonic method, and removing protein in the selenium polysaccharide by using an isoelectric precipitation method and an enzymolysis method, thereby obtaining the selenium polysaccharide in cardamine violifolia. Removing water, enzymolysis product amino acid, inorganic selenium and other impurities by a membrane separation concentration system to obtain cardamine violifolia selenium polysaccharide; wherein the eutectic solvent comprises choline chloride and malonic acid in a molar ratio of 1: 1-1: 3, and the water content is 40-60% (mass percent); the compound enzyme is prepared from bromelain and papain in a mass ratio of 1: 1. Protein in the selenium polysaccharide is removed by adopting deep eutectic solvent ultrasonic extraction and an isoelectric precipitation method combined with an enzymolysis method, enzymolysis product amino acid, inorganic selenium and other impurities are removed by adopting an ultrafiltration membrane separation and concentration system, the structure of the polysaccharide is not damaged, and the high-purity cardamine violifolia selenium polysaccharide is obtained.

The application belongs to the technical field of deep eutectic solvents, and particularly relates to a ternary deep eutectic solvent and preparation and application thereof. The ternary deep eutectic solvent is composed of choline chloride, 5-sulfosalicylic acid and gamma valerolactone according to a molar ratio of 1:4:(3-25). The strong hydrogen bond network structure between the green solvent system first destroys the ester bond between lignin and hemicellulose, then cuts off the beta-O-4 bond between lignin molecules, so as to separate lignin. Meanwhile, the deep eutectic solvent can improve the stability of carbon cations due to the conjugation effect between the lone pair electrons on the heteroatom oxygen and the central carbon in the molecular structure of gamma valerolactone, so as to inhibit the condensation reaction of lignin.

The invention discloses a method for synthesizing eutectic gel by in-situ extraction of lignin, and belongs to the technical field of gel materials.The method comprises the steps that choline chloride and acrylic acid are mixed, heated in an oil bath and stirred, and a eutectic solvent is obtained; cooling the solvent, adding dried and crushed wood powder, heating in an oil bath, extracting to obtain a mixed solution, and centrifuging to obtain supernate; adding a cross-linking agent and an initiator into the supernate, heating, stirring, and cooling to room temperature to obtain a pre-polymerized solution; and pouring the pre-polymerized liquid into a polytetrafluoroethylene mold, and carrying out ultraviolet curing to obtain the target gel. According to the method, the natural structure and active groups of the lignin are reserved to the maximum extent, the method is low-carbon, energy-saving, green and sustainable, in-situ lignin and a polymerization network cooperate, the gel is endowed with higher mechanical strength, environmental stability and functional diversity, and the limitation of existing lignin doped gel is broken through.

The invention relates to the field of comprehensive utilization of biomass resources and preparation of high polymer materials, in particular to a green preparation method of high-deacetylation-degree chitin capable of recycling reaction waste liquid. The invention aims to solve the problems of serious environmental pollution, resource waste, low product purity and incomplete waste liquid recycling in chitin extraction. The method comprises the following steps: by taking crustacean biomass as a raw material, firstly carrying out high-voltage pulse electric field pretreatment to crush the tissue structure of the raw material and improve the reaction activity, and then heating and extracting in a choline chloride-lactic acid deep eutectic solvent system to realize efficient removal of proteins and inorganic salts in the raw material; according to the method, the chitin and the alkali liquor are subjected to a rapid deacetylation reaction by adopting microwave assistance and cooperating with the action of the phase transfer catalyst; according to the method, a waste liquid graded recycling system is adopted, hydrochloric acid in waste acid liquid generated by decalcification is recycled through electrodialysis, alkali liquid is recycled through ultrafiltration-nanofiltration double-membrane combination, deep eutectic solvent components are recycled through reduced pressure distillation, and recycling of acid, alkali and a solvent is achieved.

The invention discloses a method for extracting ecdysterone from cyanotis arachnoidea by using a deep-eutectic solvent, and belongs to the technical field of ecdysterone extraction. The method comprises the following steps: mixing a deep-eutectic solvent which takes choline chloride and a hydrogen bond donor material as raw materials with water, extracting ecdysterone in roots and stems of Cyanotis arachnoidea to obtain an ecdysterone crude extract, precipitating the ecdysterone crude extract by adding water, filtering, and adsorbing ecdysterone by using macroporous resin. Adding water for elution to obtain a deep-eutectic solvent-water mixed solution, and recovering under reduced pressure to obtain an extraction solvent for cyclic utilization; and eluting by using alcohol with different concentrations to obtain an ecdysterone crude extract, and purifying the crude extract to obtain high-purity ecdysterone. Compared with a conventional extraction method, the process method adopted by the invention has the advantages that the process is simple, efficient, green and environment-friendly, the used eutectic solvent can be recycled, the loss caused by heating volatilization in the extraction process is avoided, the ecdysterone extracted by the method is pure white, the content of ecdysterone can reach 90% or above after simple purification, and the method is suitable for industrial production. After re-purification, the purity of ecdysterone detected by high performance liquid chromatography is up to 98% or above.

The invention relates to the technical field of aquatic product preservation, and discloses a natural eutectic solvent for maintaining the quality of frozen penaeus vannamei boone and application, the natural eutectic solvent is composed of choline chloride, sorbitol and water, the molar ratio of choline chloride to sorbitol is (1-5): (1-5), and the mass of water is 15-25% of the total mass of choline chloride and sorbitol. The invention also provides an application of the solvent, and the application comprises the following steps: soaking the penaeus vannamei meat in the solvent, and then freezing and storing the penaeus vannamei meat. A supramolecular network system is constructed through hydrogen-bond interaction between choline chloride and sorbitol, growth of ice crystals in the freezing storage process is inhibited, a protein structure is stabilized, and loss of unfrozen juice is reduced, so that the quality of the penaeus vannamei, such as texture, color and flavor, is maintained. The natural deep-eutectic solvent is natural and safe in component, low in heat, simple to prepare and convenient to apply, the application limitation of a traditional anti-freezing agent is solved, and the natural deep-eutectic solvent has a good industrial prospect.

The invention relates to the field of plant growth regulators, in particular to a conditioner group for improving the grain quality and the rice quality of direct seeding rice and a preparation and use method thereof.The preparation method of a conditioner in the initial heading stage comprises the following steps that 1, 6-benayl aminopurine is dissolved in a diluted hydrochloric acid solution in a assisted mode, and a 6-benayl aminopurine solution is obtained; step 2, adding choline chloride into the solution obtained in the step 1, stirring to obtain a mixed solution, transferring the mixed solution into a volumetric flask, and adjusting the pH value; 3, abscisic acid powder is dissolved with absolute ethyl alcohol, volume metering is carried out after dissolution to form a stock solution, and then PH adjustment is carried out. Two conditioners are included and sprayed in the initial heading stage and the full heading stage respectively, glumous flower degeneration can be reduced, the photosynthetic production capacity of the upper three leaves after flowering can be improved, assimilation substances are promoted to be transferred to grains, especially the filling state of vulnerable grains is improved, and the yield of the seedlings is increased. Finally, the grain number, the maturing rate, the grain weight and the yield are improved, meanwhile, the head rice rate of rice can be improved, and the protein content is reduced, so that the palatability of rice is improved.

The invention discloses a formaldehyde-free composite board for a cabinet and a preparation method of the formaldehyde-free composite board, and relates to the technical field of artificial board manufacturing. The preparation method of the formaldehyde-free composite board for the cabinet comprises the following steps: mixing high amylose with a choline chloride / urea deep eutectic solution, stirring, adding concentrated hydrochloric acid for reaction, adjusting the pH value, and adding ammonium persulfate to obtain pretreated oxidized starch; methacrylic acid dehydrated glyceride is added into the pretreated oxidized starch for a grafting reaction, then modified polyvinyl alcohol is added for blending, sodium metaphosphate is added for crosslinking, finally, heating and curing are conducted, modified titanium dioxide nanoparticles are added, and the formaldehyde-free starch adhesive is obtained. The wood shavings and the formaldehyde-free starch adhesive are mixed, and a core material is obtained; and arranging the core material between the formaldehyde-free veneers, and carrying out hot press molding to obtain the formaldehyde-free composite board. The formaldehyde-free composite board for the cabinet has excellent mechanical strength, bonding performance and water resistance.

The invention provides a preparation method of a stable-size and high-strength laminated timber, which comprises the following steps of: mixing boric acid and choline chloride, and heating and melting at 90 DEG C to form a uniform, stable and transparent liquid, so as to obtain a deep eutectic solvent DES; the preparation method comprises the following steps: under the vacuum degree of-0.1 MPa, dipping wood veneers in DES, performing high-temperature steam sterilization treatment under the condition of 121 DEG C, assembling the veneers subjected to multi-layer treatment according to a rift-grain mode, and performing hot pressing at 160 DEG C to obtain the laminated timber with stable size and high strength. The prepared laminated timber has dimensional stability and good mechanical properties, has structural applicability of direct contact with a moisture environment, and has the advantages of mildew resistance, corrosion resistance, flame retardance and the like.

The invention relates to a lotus leaf polyphenol extract with a blood fat reducing effect as well as a preparation method and application of the lotus leaf polyphenol extract. The preparation method comprises the following steps that firstly, lotus leaf powder is pretreated through low-temperature plasmas, the treatment time is 400 W, the treatment power is 6 min, then a deep eutectic solvent serves as an extraction solvent, high-pressure auxiliary extraction is conducted on the pretreated lotus leaf powder, the ultrahigh pressure is 1.0 MPa, and the extraction time is 30 min; performing centrifugal filtration, concentration and drying to obtain a lotus leaf polyphenol extract; wherein the eutectic solvent is choline chloride-lactic acid-glycerol-water in a volume ratio of 1: 1: 1: 1. According to the method, the polyphenol compounds in the lotus leaves are extracted by combining the eutectic solvent with the plasma and high-pressure extraction technology, and compared with a traditional method, the method has the advantages of being simple, efficient, high in yield, free of organic reagent pollution, high in safety, easy to industrialize and the like. The lotus leaf polyphenol extract prepared by the invention has good pancreatic lipase inhibitory activity, which indicates that the lotus leaf polyphenol extract has the effect of reducing blood fat. The lotus leaf extract disclosed by the invention has great development value in the field of obesity, and also can promote high-value utilization of lotus leaf resources.

The invention relates to the field of biological materials and nanotechnology, and discloses a nano lignin-based hydrogel preparation method which comprises the following steps: S1, pretreating more than 15% of lignin-rich cellulose biomass raw materials by using a choline chloride-lactic acid deep eutectic solvent to prepare nano lignin particles; s2, the nano lignin particles are mixed with silver nitrate and sodium hydroxide, and lignin-silver nano particles are synthesized through an oxidation-reduction reaction; s3, adding the lignin-silver nanoparticles into a polyvinyl alcohol solution, and mixing to form a mixture; and S4, carrying out freezing-thawing cycle induced physical crosslinking on the mixture to form the nano composite hydrogel. By forming a compact porous network, the hydrogel not only has good mechanical properties (the tensile strength reaches 0.7-0.9 MPa), but also has good toughness and ductility (1.0-1.3 MJ.m <-3 >) and excellent pressure sensitivity (the pressure sensitivity is 2.5-2.7 kPa <-1 >).

The invention relates to the technical field of microbial fermentation, in particular to a fermentation medium for producing oxytetracycline. According to the fermentation culture medium, a corn starch-molasses-wheat hydrolyzed sugar composite carbon source, a soybean cake powder-corn steep liquor-yeast extract composite nitrogen source and a choline chloride-betaine-L-lysine precursor accelerant in a specific proportion are used as a core innovative system, and a form regulating agent, a defoaming agent and inorganic salt are cooperatively added. Through the synergistic effect of multiple components, the fermentation titer and yield of oxytetracycline are remarkably improved, the fermentation period is shortened, the generation of heteroacid is effectively inhibited, the mycelium form is optimized, and the oxytetracycline fermentation medium is suitable for industrial large-scale production of oxytetracycline.

The application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

The invention discloses a method for efficiently preparing high-activity hericium erinaceus polysaccharide from waste in the edible mushroom industry, and belongs to the technical field of deep processing of edible mushrooms and recycling of waste. The method comprises the following steps: carrying out steam explosion pretreatment on hericium erinaceus waste mushroom residues, and carrying out synergistic compatibility on the hericium erinaceus waste mushroom residues, tea residues, bean residues and citrus residues which are subjected to specific enzymolysis to prepare a liquid fermentation culture medium; a two-stage control strategy is adopted for submerged fermentation of hericium erinaceus liquid, and hypha proliferation and polysaccharide synthesis conditions are optimized; and after fermentation is finished, extracting and purifying mycelium polysaccharide by adopting a choline chloride-lactic acid eutectic solvent system. According to the method, high-valued utilization of the edible fungus chaff and various agricultural byproducts is achieved, the content of beta-(1-> 3)-D-glucan in the prepared hericium erinaceus polysaccharide is larger than or equal to 55%, the immunocompetence (IC50) reaches 32 micrograms / mL, the hericium erinaceus polysaccharide is remarkably superior to commercially available products, and the hericium erinaceus polysaccharide can be directly used as functional food and medicine raw materials. The process is green and efficient, and has remarkable economic and environmental benefits.

The invention discloses a recyclable waste lithium iron phosphate positive electrode material eutectic solvent and a recovery method, and relates to the technical field of lithium iron phosphate extraction. The catalyst is prepared by mixing a hydrogen bond acceptor and a hydrogen bond donor, the hydrogen bond acceptor is choline chloride, the hydrogen bond donor is a mixture of citric acid and ascorbic acid, the molar ratio of the hydrogen bond acceptor to the hydrogen bond donor is (0.5-2): 1, and the molar ratio of citric acid to ascorbic acid is (0.5-2): 1; by arranging the eutectic solvent mixed with the hydrogen bond donor, the purposes that lithium iron phosphate can be efficiently leached at low temperature, meanwhile, the product purity is improved, cyclic utilization can be achieved, and no waste water or waste gas is generated in the whole process are achieved.

The invention provides nano cellulose as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out heating reaction on a mixed solution containing a biomass material and a eutectic solvent, and filtering to obtain fibers; (2) mixing the fiber with a solvent, and performing ultrasonic treatment to form the nano cellulose; wherein the eutectic solvent comprises a hydrogen bond donor and a hydrogen bond acceptor, the hydrogen bond donor is selected from 2-aldehyde acetic acid and / or chloroacetic acid, and the hydrogen bond acceptor is selected from choline chloride. The preparation method provided by the invention can effectively reduce the cost and energy consumption for synthesizing the nano cellulose.

The present invention discloses a method for extracting and recovering cobalt-containing choline chloride ethylene glycol deep eutectic solvent electrolytic waste liquid, and relates to the field of waste resource recovery. Steps are as follows: 1) water and extractant are added to cobalt-containing electrolytic waste liquid, and oil phase pH is adjusted after stirring. After sufficient reaction, cobalt-containing organic extract and aqueous deep eutectic solvent are separated and obtained; 2) dilute sulfuric acid is added to the cobalt-containing organic extract obtained in step 1), aqueous phase pH is adjusted and back-extracted, and then aqueous phase and organic phase are separated, and aqueous phase is distilled under reduced pressure to obtain cobalt sulfate solid; Organic phase returns to step 1) and is reused as extractant; 3) by step 1) The aqueous deep eutectic solvent obtained is passed through reduced pressure distillation, and the choline chloride ethylene glycol deep eutectic solvent of regeneration is obtained. The recovery method of the present invention has a high recovery rate for cobalt and choline chloride ethylene glycol deep eutectic solvent, and process is simple, environmentally friendly, and has a large application prospect.

The invention belongs to the technical field of chemical extraction, and particularly relates to a method for one-step extraction of litchi pulp polysaccharide and polyphenol based on a deep-eutectic solvent. A choline chloride-lactic acid system is used for extracting and preparing for a certain period of time through a deep-eutectic solvent, a supernatant obtained through centrifugation is lychee pulp polyphenol, a lychee pulp polysaccharide extracting solution can be obtained by washing precipitates with water for three times, and one-step efficient extraction of polyphenol and polysaccharide is achieved. The LPPP extracted by DES has strong antioxidant ability and tyrosinase activity inhibition ability, which is speculated that the LPPP can effectively inhibit the synthesis of melanin. Therefore, the litchi pulp polyphenol has high biological activity and can be used as a functional additive of food or cosmetics.

The invention provides an antibacterial antifouling material and a preparation method thereof, and belongs to the technical field of antibacterial hydrophobic materials. The preparation method comprises the following steps: reacting choline chloride serving as an antibacterial modification raw material with isocyanate to obtain acrylic acid esterified choline chloride, and carrying out ultraviolet curing in an ethanol solution by taking an acrylate compound and trimethoxyvinyl silane as hydrophobic raw materials to obtain the antibacterial antifouling material. The prepared material has good long-term antibacterial performance and antifouling performance, firstly, the material retains the antibacterial performance of a quaternary ammonium salt structure and has good hydrophobicity, so that the material not only has the antibacterial performance, but also has the good hydrophobicity, effectively prevents bacterial adhesion, increases the antibacterial effect and has the antifouling effect at the same time.