296 results about "Diethyl ether" patented technology

The invention discloses an easy-to-apply single-component polyurethane waterproof coating and a preparation method thereof, and belongs to the technical field of waterproof coatings. The easy-to-apply single-component polyurethane waterproof coating disclosed by the invention is prepared from the following raw materials: polyol, a plasticizer, a solid filler, isocyanate, a catalyst and a solvent, the polyol comprises polyether glycol and polyether triol; the plasticizer comprises acetyl tributyl citrate; the catalyst comprises a bismuth neodecanoate catalyst and a dimorpholine diethyl ether catalyst. According to the easy-to-apply single-component polyurethane waterproof coating disclosed by the invention, acetyl tributyl citrate is used for replacing traditional plasticizer chlorinated paraffin, and a bismuth neodecanoate catalyst and a dimorpholine diethyl ether (DMDEE) catalyst are compounded, so that the viscosity of the waterproof coating is effectively reduced, and construction is facilitated; meanwhile, the drying speed of the waterproof coating is increased.

The invention belongs to the technical field of oilfield chemistry, and discloses a cross-linking agent for degradable gel and a preparation method and application thereof.The preparation method comprises the steps that a compound A is dissolved in an organic solvent and stirred to be uniform, and a first solution is obtained; adding a polymerization inhibitor and a compound B into the first solution, and uniformly stirring at room temperature to obtain a second solution; the second solution is sequentially subjected to heating stirring, diethyl ether washing, ethanol recrystallization, suction filtration and drying, and the cross-linking agent for gel is obtained. According to the invention, a non-conjugated aromatic system is added into a cross-linking agent structure, so that the prepared gel can be automatically degraded under a certain temperature condition; ammonium ions and halide ions are added into a cross-linking agent structure, so that the anti-pollution performance of the gel is enhanced, and the problems that existing gel is difficult to degrade and poor in anti-pollution performance are solved.

The invention provides a preparation method of a UTSA-16 structure metal organic framework, which comprises the following steps: sequentially adding a metal salt and potassium citrate into an auxiliary solvent, adding an alkaline solution, dissolving, and treating in a ball milling manner to obtain a reaction solution; centrifuging the reaction liquid, collecting a solid part, washing with diethyl ether, soaking with methanol, and drying to obtain a precursor; and activating the precursor at the temperature of 80-90 DEG C, and removing the solvent in the pore channels to obtain the metal organic framework with the UTSA-16 structure. According to the invention, the UTSA-16 is prepared by a solvent-assisted ball milling method, the problems of high energy consumption, long time and serious pollution in the previous preparation process of the UTSA-16 are solved, and the UTSA-16 can be formed under a milder condition and within a shorter time by the method; the reaction is carried out in a ball mill, the maximum synthesis amount can be enlarged along with the scale of the ball mill, the reaction takes 3 hours, heating is not needed, and the method can be put into factories for large-scale production.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PVB (Polyvinyl Butyral) film and a preparation method thereof. The PVB film provided by the invention is prepared from the following components in parts by mass: 100 parts of PVB resin, 33 to 36 parts of triethylene glycol di-2-ethylhexoate, 7 to 9 parts of integrated anti-radiation toughening filler, 1 to 2 parts of organic montmorillonite, 0.8 to 1.2 parts of composite coupling agent, 0.5 to 1 part of ultraviolet light absorber, 0.6 to 0.8 part of antioxidant and 0.8 to 1 part of heat stabilizer. The integrated anti-radiation toughening filler adopts a core-shell structure, the anti-radiation core is composed of bismuth oxide and tungsten oxide according to the mass ratio of 3: 1, and the elastic coating layer is maleic anhydride grafted modified POE. The preparation method comprises the steps of pre-dispersion treatment, component mixing, melt extrusion, film casting, graded cooling, two-way stretching and the like. Through the core-shell structure design of the integrated anti-radiation toughening filler and the optimized processing technology, the anti-radiation performance and the toughening performance are synergistically improved, and the prepared film has the advantages of excellent anti-radiation effect, high toughness and good transparency.

The invention discloses a method for preparing 6N high-purity zinc, comprising the following steps: S1, alkali dissolution: dissolving electro zinc with sodium hydroxide, filtering after the reaction is completed; S2, acidification: adding hydrochloric acid to the filtered solution for acidification; S3, evaporation concentration: putting the acidified solution into an evaporating kettle for evaporation concentration; S4, freezing crystallization: filtering and drying the concentrated solution after cooling in a freezing tank; S5, secondary dissolution: dissolving the dried zinc chloride solid in an ether solution at room temperature, filtering; S6, vacuum distillation: putting the filtered ether solution into a vacuum distillation device, S7, heating and decomposing; S8, vacuum distillation. This method can achieve the purpose of preparing 6N high-purity zinc from electro zinc, and realize the low-cost recycling of zinc resources; at the same time, the alkali dissolution-acidification-ether secondary dissolution process can be used to effectively separate metals such as cadmium with a segregation coefficient close to 1 in zinc, which is convenient for the rear-end pyrometallurgical method to purify 6N high-purity zinc.

The invention discloses a high-temperature-resistant klebsiella pneumoniae phage, a composition of the high-temperature-resistant klebsiella pneumoniae phage and a kit, the high-temperature-resistant klebsiella pneumoniae phage is klebsiella pneumoniae phage P6AKPJS20, the preservation number of the high-temperature-resistant klebsiella pneumoniae phage is CCTCC (China Center For Type Culture Collection) NO: M20242965, and the high-temperature-resistant klebsiella pneumoniae phage has a nucleotide sequence as shown in SEQ ID No.1-6. The bacteriophage has broad-spectrum bactericidal ability, wide acid-base tolerance range and certain tolerance to chloroform and diethyl ether, and can still maintain high activity while splitting target bacteria; meanwhile, the bacteriophage has good tolerance to high temperature and can adapt to various application conditions in production.

The invention discloses a preparation method of a tin oxide-based nanofiber gas sensor array, a temperature regulation and control method and application of the tin oxide-based nanofiber gas sensor array. Firstly, different tin oxide-based nanofiber gas sensors are controllably prepared, and the gas sensing performance is optimized by adopting a temperature modulation technology; and finally, 11 VOCs (n-propanol, n-butanol, ethanol, triethylamine, formaldehyde, acetone, diethyl ether, benzene, toluene, ethylbenzene and m-xylene) gases are identified. According to the dynamic temperature control, the surface adsorption and desorption processes can be obviously influenced by changing the working temperatures of different metal oxide nanofiber sensors, so that the selective recognition of different gas molecules is realized. Besides, by reasonably designing the composition of the sensor array and a temperature control strategy, the characteristic information of different gas molecules can be effectively distinguished, and the accuracy and reliability of gas recognition are further improved.

The invention relates to an organic acid anion paired polyion liquid catalyst as well as a preparation method and application thereof. Due to environmental pollution caused by halogen, a series of environment-friendly porous polyion liquid catalysts paired with organic acid anions are designed and synthesized, 1-vinyl imidazole and bis (2-chloroethyl) ether are used as raw materials, and the ionic liquid diethyl ether bis (1-vinyl imidazole) chloride is successfully prepared. Divinyl benzene is selected as a cross-linking agent and a structure stabilizer, and a stable copolymer is prepared. The copolymer is put into a sodium hydroxide solution to react for three days, hydroxyl replaces chloride anions to obtain a substance [ECD] OH, the [ECD] OH is put into an organic acid solution to react for three days, and finally, organic acid anions replace halogen anions, so that the pollution to the environment is reduced. The series of catalysts are stable in structure, and can efficiently catalyze carbon dioxide cycloaddition to generate cyclic carbonate under the conditions of no solvent and no cocatalyst.

The invention relates to a method for detecting the encapsulation efficiency of an injection of a cytomegalovirus inhibitor. Comprising the following steps: mixing an injection of the cytomegalovirus inhibitor with diethyl ether according to a certain volume ratio, carrying out extraction separation, and carrying out quantitative analysis by using high performance liquid chromatography after separation. The detection method is simple and rapid, and can ensure the accuracy of the detection result of the encapsulation efficiency without using a complex instrument and almost without damaging the structure of the inclusion compound. Meanwhile, the method meets the requirements of accuracy and repeatability.

The invention provides a preparation method of a formaldehyde-free veneer artificial board, which comprises the following steps: (1) an adhesive is applied to the surface of a veneer, the adhesive is composed of a part A and a part B. The part A is one or more of isocyanate or modified isocyanate, or a mixture of the isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate; the part B is a hydroxyl-terminated compound or a mixture of the hydroxyl-terminated compound, a catalyst and one or more of sulfolane, preferably, the glue applying amount of the part B in different layers of veneers is different, and the applying amount is gradually increased from the surface layer veneer to the core layer veneer; (2) forming a plate blank by the veneers according to a certain rule; and (3) feeding the plate blank into a hot press to prepare the formaldehyde-free added veneer type artificial board. The method for producing the formaldehyde-free veneer type artificial board is simple and easy in process, high in hot-pressing production efficiency, excellent in mechanical property, good in flatness and low in warping degree, and can resist boiling in boiling water for 72 hours.

The invention relates to a preparation method of a polyester film based on full-hydroxyl column [5] arene. The polyester film with salt separation is prepared by taking full-hydroxyl column [5] arene as a water-phase monomer through an interfacial polymerization method. The method comprises the following steps: (1) synthesizing methoxy pillar [5] arene from 1, 4-dimethoxybenzene and paraformaldehyde under the catalysis of boron trifluoride diethyl etherate; (2) reacting the purified product with boron tribromide, and removing methyl groups to obtain full-hydroxyl column [5] arene; (3) dissolving the product in an aqueous solution containing triethylamine, and forming a two-phase solution of interfacial polymerization reaction with an n-hexane solution of trimesoyl chloride; and (4) sequentially coating the surface of the polyacrylonitrile ultrafiltration membrane with the aqueous phase solution and the organic phase solution, and carrying out interfacial polymerization reaction to obtain the polyester membrane. Based on the inherent cavity and polyhydroxy characteristics of the full-hydroxyl column [5] arene, compared with a traditional polyamide membrane, the obtained polyester membrane has high permeability and selectivity, can efficiently separate dye and inorganic salt, and is suitable for water treatment processes of printing and dyeing wastewater and the like.

The invention belongs to the field of polymer catalysis, and discloses a DMF (Dimethyl Formamide)-based heteropolyacid synergistic catalysis system as well as a preparation method and application thereof. The method comprises the following steps: adding sodium molybdate and disodium hydrogen phosphate into deionized water, adjusting the pH value to 2-3, then adding sodium metavanadate, heating and stirring at 95-100 DEG C, cooling at room temperature, and then adding diethyl ether and a sulfuric acid solution until an upper diethyl ether phase becomes light yellow from colorless; and drying the lowermost layer phase yellow oily substance, grinding and drying to obtain H5PMo10V2O40, and adding the H5PMo10V2O40 into a DMF (Dimethyl Formamide) solvent to prepare the DMF-based heteropolyacid synergistic catalysis system. According to the method, DMF is used as a solvent, the D-fructose is catalytically cracked in oxygen through a one-step method to be converted into DFF, gas does not need to be switched in the reaction process, and the prepared catalytic system is excellent in catalytic benefit, can be recycled, saves manpower and material resources in the catalytic process, is low in equipment requirement and can be suitable for reactions such as catalytic cracking of biomass.

The invention belongs to the technical field of azeotropic distillation and dehydration of isopropanol, particularly relates to an azeotropic distillation and dehydration method of industrial-grade isopropanol, and aims to solve the problems that the energy consumption of separation of isopropanol and solvents is high, the energy consumption is low and the like due to the fact that solvents such as benzene and cyclohexane are adopted for azeotropic distillation and dehydration in the conventional isopropanol dehydration process, but the boiling points of benzene and cyclohexane are close to those of isopropanol. In order to solve the problems that when diethyl ether is used as an azeotropic agent, the solvent is easily enriched at the tower top to form potential safety hazards, and when the solvents are used for azeotropic distillation, the requirements of electronic chemicals cannot be met, the following scheme is provided: the method comprises the following steps: S1, adding an industrial-grade isopropanol raw material into an azeotropic distillation tower; the azeotropic dehydrating agent disclosed by the invention is small in boiling point, high in ignition point, non-corrosive, low in price, good in safety and low in separation energy consumption, and has excellent application value and application prospect in industrial production and experiments, the used device is simple and easy to operate, the yield is high, and automatic production can be realized.

The invention discloses application of a carbon steel corrosion inhibitor based on combination of physical adsorption, chemical adsorption and hydrophobic barrier, and relates to the technical field of metal corrosion inhibition. The technical problem that a corrosion inhibitor in the prior art is low in corrosion inhibition efficiency in a high-temperature strong-acid environment is solved. The preparation method of the carbon steel corrosion inhibitor comprises the following steps: firstly, ultrasonically dissolving 4-aminopyridine to obtain a solution I; then, dropwise adding an isopropanol solution of 2, 3-epoxypropyltrimethylammonium chloride into the solution I according to a molar ratio of 1: 1, removing a solvent through a rotary evaporation method, washing with ethanol, centrifuging to obtain quaternized 4-aminopyridine, and drying the quaternized 4-aminopyridine; and finally, the dried quaternized 4-aminopyridine and bromododecane are added into acetonitrile for a reaction, diethyl ether is dropwise added into obtained reaction liquid for precipitation, and the quaternized 4-aminopyridine-bromododecane carbon steel corrosion inhibitor is obtained after drying. The prepared carbon steel corrosion inhibitor is high in corrosion inhibition efficiency in a high-temperature and strong-acid environment.

The present invention provides a paroxysmal hemoglobinuria indication drug ipropam key intermediate synthesis method, and relates to the technical field of ipropam, the method comprises: taking p-bromobenzaldehyde as an initial raw material, adopting an S-configuration catalyst to obtain an intermediate 03, carrying out protection group removal on the intermediate 03, carrying out automatic ring closing to obtain an intermediate 04, and carrying out post-treatment to obtain the paroxysmal hemoglobinuria indication drug ipropam key intermediate. Reducing the intermediate 04 with sodium borohydride to obtain a single cis-configuration intermediate 05, then carrying out a chiral flip reaction and hydrolysis to remove p-nitrobenzoic acid, then carrying out an etherification reaction with diethyl sulfate to obtain an intermediate 08, reducing amide of the intermediate 08 with sodium borohydride and boron trifluoride diethyl etherate to obtain an intermediate 09, then carrying out an acetylation reaction to protect amino, and finally carrying out a reaction to obtain the chiral cis-configuration intermediate 03. Cuprous cyanide is subjected to a cyanation reaction and a hydrolytic esterification reaction to obtain the ipropam key intermediate TM. The method is low in raw material price, high in chiral control selectivity, easy in reaction condition control and low in equipment requirement, avoids column chromatography and other operations, and is more suitable for industrial production.

The invention discloses a preparation method and application of a red carbon composite graphite phase carbon nitride photocatalytic material, comprising the following steps: S1, preparing a red carbon semiconductor: dissolving malonic acid in anhydride, reacting at a certain temperature by condensation reflux to obtain a product solution, dropping the solution into diethyl ether to obtain a solid precipitate, and washing with diethyl ether to obtain a red carbon semiconductor; S2, preparing a graphite phase carbon nitride: calcining a carbon nitrogen compound at a high temperature to obtain a graphite phase carbon nitride g-C3N4; S3, preparing a red carbon / g-C3N4 photocatalyst: compounding the red carbon semiconductor obtained in S1 with the graphite phase carbon nitride g-C3N4 obtained in S2 by an ultrasound-assisted method to obtain a red carbon / g-C3N4 photocatalyst. The red carbon composite g-C3N4 photocatalyst obtained in this scheme integrates the advantages of heterogeneous structure to improve charge separation efficiency and narrow bandgap red carbon to enhance visible light response, which is conducive to promoting photolysis of water to produce hydrogen, and the structure.

The invention relates to the technical field of pharmaceutical analysis, in particular to a thin-layer chromatography identification method of vitality-preserving decoction and a preparation thereof. Comprising the following steps: S1, extracting a sample to be detected by using diethyl ether, and preparing a test solution; s2, preparing a cinnamaldehyde reference substance solution and a 6-gingerol reference substance solution; the method further comprises at least one of the steps S3 and S4; s3, dripping the test solution and the cinnamaldehyde reference solution on the same thin-layer plate, developing with a first developing solvent, and identifying the cinnamon; the first developing solvent comprises petroleum ether and ethyl acetate in a volume ratio of (15-20): 3; s4, dripping the test solution and the 6-gingerol reference substance solution on the same thin-layer plate, developing with a second developing solvent, and identifying the ginger; the second developing solvent is prepared from petroleum ether, trichloromethane and ethyl acetate according to the volume ratio of (2-4): (1-2): (1-3). The method is good in overall separation effect, clear in spots, good in specificity and durability, and capable of identifying the medicine flavors of cinnamon and ginger in the vitality-preserving decoction and the preparation thereof.

An analysis method for detecting multiple residual solvents during the preparation process of a drug. In the method, a gas chromatographic method is utilized to simultaneously detect 21 organic solvents, i.e. methanol, tetrahydrofuran, ethanol, cyclohexane, diethyl ether, isopropyl acetate, acetone, n-heptane, isopropanol, n-butyl alcohol, acetonitrile, dioxane, dichloromethane, pyridine, tert-butyl alcohol, toluene, tert-butyl methyl ether, N,N-dimethylformamide, n-hexane, dimethyl sulfoxide and ethyl acetate. The method is free from influence of drug types, can be applied to the content detection of multiple residual solvents in drugs, has simple operation and a wide usable range, and saves on the time and cost for drug detection.

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of 2-sulfydryl-6-chlorobenzoic acid, which comprises the following steps: dissolving chlorobenzoic acid in dimethyl sulfoxide, adding sodium hydrogen sulfite, and stirring at room temperature; the preparation method comprises the following steps: dissolving mercaptobenzoate in dimethyl sulfoxide, adding sodium carbonate and dimethylamino, and reacting at high temperature; cooling to room temperature, and adjusting the pH value to be neutral by using dilute acid; adding into diethyl ether, uniformly mixing, adding into dilute acid, and standing for layering to obtain 2-sulfydryl-6-chlorobenzoic acid; the preparation method of the chlorobenzoic acid comprises the following steps: mixing parachlorotoluene with water, adding a supported catalyst, stirring and heating; after the temperature rises to 80 DEG C, adding potassium permanganate in batches for reaction; and filtering, adjusting the pH value to be acidic by using dilute acid, and then carrying out suction filtration and drying to obtain the chlorobenzoic acid. According to the preparation method disclosed by the invention, chlorobenzoic acid and mercaptobenzoate are subjected to a reaction to obtain 2-mercapto-6-chlorobenzoic acid with high yield; the method has the characteristics of simplified operation, energy consumption reduction, shortened production period and low production cost.

The invention discloses a phototherapy reagent and a preparation method and application thereof. The preparation method comprises the following steps: 1-[4-(diethylamino) phenyl]-ethane-1-ketone and 4-methoxybenzaldehyde are subjected to a condensation reaction in a NaOH ethanol solution, and a product and nitromethane are subjected to addition; performing condensation and addition on the other groups of raw materials by the same method; cyclizing the two addition products with ammonium acetate, and coordinating with boron trifluoride diethyl etherate to obtain NHM; carrying out substitution reaction on the NHM and sodium nitrite to obtain NOO; and oxidizing NOO by m-chloroperoxybenzoic acid to obtain NNOO. The reagent can target a tumor hypoxia microenvironment, hypoxia monitoring is achieved, NO is released through photostimulation for tumor gas therapy, meanwhile, the secondary amplification photo-thermal therapy effect is achieved, preparation is controllable, diagnosis and treatment are integrated, and the reagent is sensitive, safe and suitable for biomedical research and clinical diagnosis.

The invention discloses a method for measuring the purity of lithium hydroxide based on a gravimetric method, which comprises the following steps: weighing a lithium hydroxide sample, mixing with an organic reagent 1 in batches, and heating to obtain a primary reactant; fully mixing the primary reactant with an organic reagent 2, filtering, collecting filtrate, diluting, adjusting the pH value to 6-6.5, and adding diethyl ether for extraction to obtain a lower-layer lithium chloride solution; adding a precipitant into the solution, reacting under a constant-temperature water bath condition, filtering and drying the obtained filter residue to constant weight, and calculating the purity of the lithium hydroxide according to the constant weight. According to the method, carbonate interference is avoided through the selective organic reagent, the content of the lithium hydroxide is directly measured through the gravimetric method, the detection process is simplified, dependence on operators and large equipment is reduced, the method has the advantages of being high in accuracy, good in repeatability, wide in application range and low in detection cost, and rapid and accurate measurement of the purity of the lithium hydroxide can be achieved.

The invention discloses a coating cleaning agent and a cracking reactor thereof. The coating cleaning agent comprises the following components: oleic acid, isopropanolamine, ammonia water, ethylene glycol monobutyl ether n-butyl alcohol, kerosene, diethyl ether, petroleum ether, diesel oil, acetone, oil-soluble manganese salt, polyoxyethylene octylphenol ether and lubricating oil. The cracking reactor for the coating cleaning agent is used for cracking reaction of the coating cleaning agent. According to the invention, through pretreatment of chemical cracking reaction, a foundation is laid for subsequent polymerization and chaining of a conjunctival membrane, and the repairing effect is improved.

The present invention relates to the technical field of the preparation of macrocyclic compounds, specifically a preparation method and application of a novel fluorescent macrocyclic compound. The preparation method synthesizes a dialdehyde-substituted intermediate through a Suzuki coupling reaction; the obtained intermediate is reduced to benzyl alcohol and then converted into benzyl chloride; benzyl chloride and 1,4-bis(bromomethyl)benzene are subjected to a Friedel-Crafts reaction to obtain a monomer; under the catalysis of boron trifluoride diethyl ether, the monomer is cyclized to obtain a bromine-chain-substituted macrocyclic compound; the bromine-chain-substituted macrocyclic compound reacts with trimethylamine in ethanol to obtain a water-soluble fluorescent macrocyclic compound. By designing and synthesizing the novel fluorescent macrocyclic compound, the present invention can generate singlet oxygen in vitro, effectively encapsulate antibacterial drugs, and perform bacterial imaging at the same time. Through the synergistic effect, the macrocyclic compound enhances the efficacy of antibacterial drugs, overcomes the problems of drug resistance and reduced drug efficacy of traditional antibacterial agents, and provides a new strategy for antibacterial treatment.

The application belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of methoxychlorpromazine monohydrochloride monohydrate. The method comprises the following steps: step 1, methoxychlorpromazine base is dissolved in a polar solvent, and hydrochloric acid is added to obtain a mixed solution; step 2, a poor solvent of methoxychlorpromazine monohydrochloride monohydrate is added to the mixed solution, crystallization is carried out, and separation is performed, and methoxychlorpromazine monohydrochloride monohydrate is obtained; the poor solvent is selected from one or a mixture of two or more of isopropyl alcohol, n-butyl alcohol, acetone, butanone, ethyl acetate, butyl acetate, dichloromethane, trichloromethane, toluene, methyl tert-butyl ether, isopropyl ether and diethyl ether. The method has the advantages of simple process, good repeatability, easy operation, high yield, product purity of more than 99.8%, complete compliance with the requirements of European Pharmacopoeia 9.0 and US Pharmacopoeia USP43, and suitability for industrial production.

The invention discloses a preparation method of 3-((1r, 3r, 5r, 7r)-adamantane-2-yl) propiolic acid. The preparation method provided by the invention comprises the following steps: (1) taking adamantanone as a starting raw material, and carrying out French reaction to prepare a compound 2; (2) the compound 2 is subjected to a dehydroxylation reaction under the action of boron trifluoride diethyl etherate and triethyl silane, and a compound 3 is prepared; and (3) carrying out hydrolysis reaction on the compound 3 under the action of LiOH to obtain a target product, namely 3-((1r, 3r, 5r, 7r)-adamantane-2-yl) propiolic acid. The preparation method disclosed by the invention is short in process route, simple and convenient to operate, mild in reaction condition, easy to control, high in yield, few in by-products, relatively low in cost and suitable for process amplification.

The invention relates to a method for extracting paeonol and paeoniflorin from fresh radix paeoniae rubra. The method comprises the following specific steps: washing and mincing the fresh radix paeoniae rubra, extracting with diethyl ether, performing alcohol extraction and water extraction, filtering, concentrating, performing alcohol precipitation, crystallizing and recrystallizing to obtain pure paeonol and paeoniflorin products. According to the method disclosed by the invention, diethyl ether extraction is adopted, so that not only is the enzyme activity of the fresh peony accelerated to be damaged, but also the risk that paeonol is oxidized is reduced, the leaching speed of paeonol is increased, the utilization efficiency of the fresh peony is greatly improved, the drying step of the fresh peony is effectively reduced, and the production energy consumption during extraction processing is saved; the dissolution and volatilization characteristics of paeonol are fully considered, diethyl ether removal and paeonol volatilization are carried out by utilizing different temperature gradients, and refining is carried out to obtain a pure paeonol product.

The present application relates to an electrolyte composition for a lithium secondary battery and a lithium secondary battery comprising the same, the electrolyte composition comprising a lithium salt and an organic solvent. The organic solvent includes a first ether solvent (R-O-R ') having a fluorinated alkyl group, and a second ether solvent. The first ether solvent may be 5-ethoxy-1, 1, 2, 2, 3, 3, 4, 4-octafluoropentane, 1, 1, 2, 2, 3, 3, 4, 4-octafluoro-5-methoxypentane, or a mixture thereof, and the second ether solvent may be selected from the group consisting of dimethoxyethane, diethyl ether, and similar ethers. The lithium salt includes a compound such as LiTFSI, LiFSI, or LiPF6. The first ether solvent accounts for 30% to 90% by volume of the electrolyte, wherein the concentration of the lithium salt ranges from 0.1 M to 3.0 M. The electrolyte composition enhances battery stability and makes it suitable for use in lithium secondary batteries and lithium metal secondary batteries.

The invention relates to ginseng polysaccharide as well as a preparation method and application thereof. The preparation method comprises the following steps: soaking ginseng slices in water, decocting, filtering, collecting filtrate, decocting filter residues in water, filtering, and collecting filtrate; combining the two filtrates, and concentrating to obtain a concentrated solution; adding 95% ethanol into the concentrated solution, standing and centrifuging, and collecting supernate; adding 95% ethanol into the supernate, standing and centrifuging, and collecting the precipitate; adding water into the precipitate for dissolving, then adding trichloromethane and n-butyl alcohol, shaking and standing, taking supernatant, adding trichloromethane and n-butyl alcohol into the supernatant again, shaking and standing, taking supernatant, repeating for many times, and taking final supernatant; adding 95% ethanol into the final supernatant, standing and centrifuging, and collecting the precipitate; and washing the precipitate with 95% ethanol, absolute ethyl alcohol, isopropanol and diethyl ether in sequence to obtain the ginseng polysaccharide. The ginseng polysaccharide prepared by the preparation method disclosed by the invention is brand new ginseng polysaccharide and has the effects of promoting cell proliferation and repairing cells damaged by ultraviolet rays.

The invention discloses an electrolyte, a lithium ion battery and an electronic product. The electrolyte comprises electrolyte salt and a solvent; wherein the concentration of the electrolyte salt is 0.1 mol / L-5 mol / L, and the ether solvent comprises one or more of dimethoxymethane, diethoxymethane, 1, 2-diethoxyethane, 1, 3-dioxolane, 1, 3-dioxane, 1, 4-dioxane, tetrahydrofuran, 2-methyltetrahydrofuran, tetrahydropyran, diethyl ether, cyclopentyl methyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether. According to the electrolyte provided by the invention, the ether solvents are reasonably screened, and the ether solvents with relatively weak lithium salt dissolving capacity are selected, so that the electrolyte forms contact ion pairs and aggregation ion pairs at low concentration, and then anion derivative interface chemistry is introduced, and the obtained electrolyte reduces co-intercalation behaviors and is relatively good in stability at low temperature; the method is suitable for low-temperature environments.

The invention provides a method for preparing adamantane, and relates to the technical field of chemical production. The method comprises the following steps: mixing 1-bromoadamantane, an organic solvent and an aminating agent and heating at 160-250° C. to obtain adamantane; the organic solvent comprises one or more of diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether, and the aminating agent is a mixture of urea and sodium bicarbonate; the method solves the technical problems that the current preparation of adamantane has a large risk, high cost and is difficult to use for industrial production.