984 results about "Ethanol" patented technology

The invention discloses a synthetic method of a water soluble ultraviolet light absorber BP-9. The method mainly comprises the following process steps: (1) carrying out methylation on the main raw materials of 2, 2', 4, 4'-tetrahydroxyl benzophenone, a transition metal salt catalyst and a mixed solvent which is prepared from dichloroethane and anhydrous ethanol in equal parts by weight to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone; (2) carrying out sulfonation reaction on the main raw materials of methylate, sulfamic acid and C1-C3 halohydrocarbon to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone-5, 5'-disulfonic acid; and (3) carrying out neutral reaction on the main raw materials of sulfonated product, inorganic base and ethanol water to finally obtain the BP-9 product. The synthetic method disclosed by the invention is few in reaction step, low in cost, high in product purity and stable in quality, and raw materials are easily available.

The invention belongs to the field of photocatalytic materials, and particularly relates to a high-entropy sulfide and a preparation method and application thereof. The high-entropy sulfide is granular, the molecular general formula is (MnaFebCocCudZe) xS, x is equal to 1, and the atomic ratio of Mn to Fe to Co to Cu to Zn is a: b: c: d: e of (1-2): (1-2): (1-2): (1-2): (1-2): (1-2): (1-2). The preparation method comprises the following steps: S1, dissolving metal salt in a mixed solvent of isopropanol and glycerol according to the atomic ratio of metal elements, and carrying out solvothermal reaction to obtain a precursor; and S2, dispersing the precursor in ethanol, adding thioacetamide as a sulfur source, and carrying out solvothermal reaction to obtain the high-entropy sulfide. The high-entropy sulfide disclosed by the invention is used as a photocatalytic material and shows excellent photocatalytic performance.

The invention belongs to the technical field of conductive adhesives, and particularly relates to a salt-fog-resistant waterborne conductive adhesive and a preparation method thereof.The salt-fog-resistant waterborne conductive adhesive is mainly prepared from, by weight, 5-10 parts of salt-fog-resistant waterborne polyurethane; 5 to 10 parts of water-based tackifying resin; 30 to 50 parts of conductive silver powder; 10 to 20 parts of ethanol; 2-10 parts of an anti-hydrolysis agent; and 10-30 parts of deionized water. According to the salt-fog-resistant aqueous conductive adhesive, polyurethane resin with polytetrahydrofuran alcohol and polycaprolactone polyol as main structures is used as matrix resin, a system is endowed with excellent water resistance and salt-fog resistance, the salt-fog-resistant aqueous conductive adhesive shows outstanding hydrolysis-resistant stability after being cured, and the salt-fog-resistant aqueous conductive adhesive and the conductive silver powder have a synergistic effect, so that the anti-settling performance is effectively improved.

The invention relates to the field of medical materials and medical instruments, and discloses a dry bioprosthetic valve and a preparation method thereof.The preparation method comprises the following steps that S1, pericardium and a cross-linking agent solution are mixed for a cross-linking reaction; s2, carrying out first dehydration treatment on the crosslinked pericardium by adopting a first dehydration solution with gradually increased concentration gradient under an ultrasonic condition; and S3, carrying out second dehydration treatment on the pericardium subjected to the first dehydration treatment by adopting a second dehydration solvent, so as to obtain the dried bioprosthetic valve. According to the preparation method provided by the invention, ethanol, isopropanol and water in a specific proportion are adopted to prepare a dehydration solution with gradient concentration, and two-step dehydration drying is carried out in combination with the physical effect of an ultrasonic technology and glycerol, so that rapid rehydration of the bioprosthetic valve is realized, and the original shape and mechanical property of the bioprosthetic valve can be better recovered after rehydration; and the immediate hemodynamic stability of the valve is improved.

The invention relates to the technical field of pharmaceutical preparations, and provides a minoxidil film coating agent as well as a preparation method and application thereof. The minoxidil film coating agent provided by the invention comprises 40-60% of propylene glycol, 3-7% of polyvinyl alcohol, 20-30% of ethanol, 1-7% of minoxidil and the balance of water. According to the invention, propylene glycol is taken as a solvent, a plasticizer and a transdermal absorption enhancer, polyvinyl alcohol is taken as a film-forming material, and ethanol is taken as a volatile agent, after administration, ethanol is volatilized to promote film formation of polyvinyl alcohol, and propylene glycol enhances the plasticity of the formed film, so that the effect of reducing liquid medicine loss is achieved, the local medicine concentration is increased, and the bioavailability is improved. The minoxidil liniment disclosed by the invention has excellent skin permeability, can effectively convey a medicine to a required part, and can ensure that the medicine is released at a fixed position of the skin and is accurately administered in a medicine release process, so that the stimulation of liquid medicine flow to other parts is reduced, and a good treatment effect is achieved.

The invention provides a hole transport layer precursor solution, a hole transport layer, a preparation method and application of the hole transport layer, and a perovskite cell, and belongs to the technical field of hole transport layers. The hole transport layer precursor solution comprises a self-assembled single molecule and an organic solvent; the organic solvent comprises a solvent A, a solvent B and a solvent C; the solvent A comprises more than one of a phosphate ester solvent and an alcohol ether solvent; the solvent A contains four hydrogen bond receptors; the boiling point of the solvent A is 215-290 DEG C; the solvent B comprises more than one of ethanol, isopropanol, normal propyl alcohol, butanol, ethylene glycol and N, N-dimethylformamide; the solvent C comprises more than one of ethyl acetate and normal hexane. A ternary hydrogen bond network is formed through the solvent A, the solvent B and the solvent C, the agglomeration degree of SAM molecules is remarkably reduced, and the device performance is improved.

This invention discloses a method for preparing an air-based hydrophilic-oleophobic coating, comprising the following steps: a) adding a silane coupling agent to ethanol to obtain solution A; b) first adding perfluorooctanoic acid and sodium hydroxide to ethanol to obtain a sodium perfluorooctanoate ethanol solution, then adding at least two types of hydrophilic nanoparticles of the same particle size to the sodium perfluorooctanoate ethanol solution to obtain solution B; c) adding a fluorinated surfactant and at least two types of hydrophilic nanoparticles of the same particle size to ethanol to obtain solution C; d) first mixing solution B and solution C uniformly to obtain solution D, then slowly adding solution A dropwise to solution D to obtain suspension E; e) spraying suspension E onto the surface of a substrate and drying at 55-65°C for 1-3 hours to obtain an air-based hydrophilic-oleophobic coating. The preparation method of this invention is simple, and the resulting coating exhibits excellent hydrophilicity and oleophobicity, acid and alkali resistance, salt resistance, and oil stain resistance.

The invention discloses high-purity oxamide with concentrated particle size and spherical morphology, a preparation method of the high-purity oxamide and application of the high-purity oxamide in preparation of a slow-release fertilizer, and belongs to the technical field of oxamide synthesis and application. The method comprises the following steps: mixing an ammonia-alcohol solution and an alcohol ester solution, conveying the mixed solution into a series tubular reactor for reaction, and then conveying the mixed solution into a parallel tubular reactor for reaction after pressure stabilization and flow equalization to obtain a reaction solution containing oxamide; performing flash evaporation on the reaction liquid to obtain flash evaporation liquid and flash evaporation gas, and performing solid-liquid separation on the flash evaporation liquid to obtain solid oxamide and filtrate; and drying the solid oxamide to obtain the oxamide. The method realizes high conversion rate and high purity, and the product has ultrafine particle size distribution. The purity of the prepared oxamide is greater than or equal to 99%, the D50 particle size is concentrated to 50 + / -15 microns, the spherical morphology is uniform, the release is stable, and the oxamide has a very good effect in preparation of long-acting slow-release fertilizers and combustion inhibitors and research on the nitrogen utilization rate.

The invention provides a preparation method and application of a silicon dioxide anti-blocking agent for a thin film, and relates to the technical field of anti-blocking agents. The preparation method of the silicon dioxide anti-blocking agent comprises the following steps: uniformly mixing and stirring tetraethoxysilane, ethanol, water and ammonia water, adding polyethylene glycol, stirring, carrying out water bath reaction, centrifuging, washing and calcining to obtain porous silicon dioxide microspheres; the preparation method comprises the following steps: dispersing porous silicon dioxide in absolute ethyl alcohol, adding a silane coupling agent, reacting, centrifuging, washing and drying to obtain silanized porous silicon dioxide microspheres; dispersing the silanized porous silicon dioxide microspheres in deionized water, adding a surfactant lauryl sodium sulfate and a methyl methacrylate and butyl acrylate monomer mixture, adding an initiator azodiisobutyronitrile for reaction, and centrifuging, washing and drying after the reaction is completed; and finally, carrying out heat treatment on the obtained product. The binding force between existing silicon dioxide anti-blocking agent particles and a film substrate is improved, and long-term effectiveness is maintained.

The invention provides a platycodon grandiflorum extract for preventing or / and treating non-alcoholic fatty liver disease, which is prepared by the following steps: extracting a platycodon grandiflorum medicinal material with absolute ethyl alcohol to obtain a platycodon grandiflorum extract PG-1; and extracting platycodon grandiflorum dregs with water to obtain the platycodon grandiflorum extract PG-2. The invention also provides a preparation method and application of the platycodon grandiflorum extract. The platycodon grandiflorum extract disclosed by the invention has an obvious effect of treating the non-alcoholic fatty liver disease, and compared with an atorvastatin calcium tablet, the medicinal effect of the platycodon grandiflorum extract is equivalent to that of the atorvastatin calcium tablet in two groups of extracts PG-1 and PG-2-1; according to the present invention, the pharmacological effects of the extracts PG-2 and PG-2-2 groups are significantly superior to the pharmacological effects of atorvastatin calcium tablets, and particularly, the separated and purified extracts PG-2-2-1, PG-2-2-2 and PG-2-2-3 can provide significant effects under the milligram-level use amount, and provide the pharmacological effects better than the pharmacological effects of the single platycodin D so as to provide the synergistic effect. In the preparation process of the PG-2-2-3, only ethanol with different concentrations needs to be used for separation and purification, so that the production cost is greatly reduced, and meanwhile, the pollution of chemical reagents is reduced.

The invention relates to a method for determining the content of total ginkgolic acid in a ginkgo biloba extract, which comprises the following steps: dissolving an extract sample in 50% ethanol, and extracting with chloroform. Adding a proper amount of ethanol into the water layer, and extracting with chloroform; and combining all extraction liquids, concentrating to be dry, dissolving residues by using methanol, and detecting by using a liquid chromatograph. By investigating a linear range test, a precision test, a stability test, a repeatability test and a standard recovery test of the method, the method can remarkably improve the purity and the detection sensitivity of a target object, reduce the matrix effect and solve the problem of impurity co-extraction of a traditional single solvent, so that the content detection result of ginkgolic acid is more accurate, and the method is suitable for industrial production. The method plays an important role in guaranteeing the safety of the ginkgo biloba extract product.

The invention belongs to the technical field of forest chemical industry and natural perfume extraction and separation, and particularly discloses a superheated steam distillation separation and recovery method for perfume components in cinnamon oil rectifying still residues. The method comprises the following steps: processing the cinnamon oil rectifying still residues by adopting a steam distillation method taking normal-pressure superheated steam as a desorption medium, carrying out condensation cooling and phase separation on distilled oil-water mixed gas, and collecting oily liquid or crystalline solid containing cinnamon spice components, and carrying out one or more physical isolation methods such as freezing crystallization, vacuum fractionation or rectification, recrystallization and the like to obtain natural cinnamon monomer spices such as o-methoxycinnamaldehyde, o-methoxycinnamic acid, phenethyl alcohol and the like. The method has the advantages of low equipment investment, simple and feasible operation, low production cost, clean and pollution-free process, good operation safety, high industrial application feasibility and the like.

The invention discloses a steel cylinder cleaning method. The method comprises the steps that ethyl alcohol is injected into a steel cylinder; rolling the steel cylinder filled with the ethanol for multiple times to rinse the inner wall of the steel cylinder, and then emptying the ethanol in the steel cylinder; injecting ultrapure water into the steel cylinder cleaned by the ethanol; rolling the steel cylinder filled with the ultrapure water for multiple times, rinsing the inner wall of the steel cylinder, and then emptying the ultrapure water in the steel cylinder; nitric acid is injected into the steel cylinder cleaned by the ultrapure water, metal ions in the steel cylinder are dissolved, and then the nitric acid in the steel cylinder is emptied; injecting ultrapure water into the steel cylinder to rinse the steel cylinder, and emptying the ultrapure water in the steel cylinder; taking the discharged ultrapure water as a sample, and detecting the content of residual metal ions in the steel cylinder; according to the obtained metal ion content, whether the steel cylinder meets the cleanliness requirement or not is judged, if the cleanliness requirement is met, a small amount of nitric acid is added into the steel cylinder, sampling detection is conducted after the steel cylinder is moistened and washed, and if the test result is consistent with the previous metal ion content, the steel cylinder is clean. According to the steel cylinder cleaning method, external source introduction is avoided while metal ion impurities in the steel cylinder are treated.

The invention discloses a bionic tree-shaped evaporator based on hollow microtubes and application thereof, and relates to the technical field of solar water treatment.The bionic tree-shaped evaporator is prepared through the following steps that bacterial cellulose hybrid spinning solution serves as shell layer fluid, absolute ethyl alcohol serves as core layer fluid, the shell layer fluid and the core layer fluid are co-extruded into an ethyl alcohol coagulating bath, curing is conducted, washing is conducted with ethyl alcohol and deionized water in sequence to be neutral, and drying is conducted to obtain the bionic tree-shaped evaporator. A hollow hybrid microtube is obtained; and arranging and fixing the plurality of hollow hybrid microtubes on a bracket according to a tree-shaped branch structure to obtain the bionic tree-shaped evaporator. The bionic tree-shaped evaporator prepared by the invention has excellent mechanical flexibility, salt tolerance and purification efficiency, and provides a new material and a new scheme for efficient and sustainable solar seawater desalination and wastewater treatment.

< TableDetails number = '0001' > < Title / > < tbl: tgroup cool = '2' > < tbl: colspec cool = 'c001' cool = '46%' / > < tbl: colspec cool = 'c002' cool = '54%' / > < tbl: cool > < tbl: cool = '1' > impurity < / tbl: cool > < tbl: cool = '1' > HPLC percentage content < / tbl The mobile phase B is a 8mmol / L ammonium acetate solution, and the solvent is a mixed solvent of acetonitrile and water in a volume ratio of 95: 5; and carrying out gradient elution at a flow rate of 1.0 ml / min.

The invention provides a method for preparing a fluorocarbon resin super-hydrophobic coating, and relates to the field of coatings. The preparation method comprises the following steps: adding nano silicon dioxide into a mixture of ethanol and water, stirring, and carrying out ultrasonic dispersion to obtain a dispersion liquid; dropwise adding a silane coupling agent into the dispersion liquid, ultrasonically dispersing uniformly, heating and stirring in a water bath, cooling to room temperature, centrifuging, washing a solid with absolute ethyl alcohol, and drying to obtain nano silicon dioxide powder; s2, mixing the nano silicon dioxide powder prepared in the step S1 with an N-methyl pyrrolidone solution of PVDF, and uniformly stirring to obtain coating slurry; and taking an absolute ethyl alcohol solution of epoxy resin as a primer, spraying the primer on the cement surface, curing, spraying the coating slurry, and curing to obtain the coating. The super-hydrophobic coating plays a role in protecting and strengthening the cement matrix, and the mechanical strength of the surface of the cement matrix is improved.

The invention discloses a zinc oxide modified silicon dioxide catalyst, a preparation method and application of the zinc oxide modified silicon dioxide catalyst in catalytic alcoholysis of waste PET (polyethylene terephthalate), zinc acetate and silicon dioxide are added into a mixed solution of water and ethanol and uniformly mixed, and a mixed reaction solution is obtained; adding a sodium hydroxide aqueous solution into the mixed reaction solution, carrying out a first reaction, and standing to obtain a suspension; and adding an L-ascorbic acid aqueous solution into the suspension, carrying out a second reaction, carrying out solid-liquid separation, and calcining the solid part in an air atmosphere to obtain the product. The prepared zinc oxide modified silicon dioxide nano material can be used as a catalyst to be applied to alcoholysis recovery of waste polyester, the product yield reaches up to 92% or above, the product selectivity is high, metal residues are avoided, the catalyst is easy to recover and can be recycled, and the application prospect is wide.

The invention relates to a bio-based sulfur-phosphorus-free nitrogen-containing borate organic molybdenum antifriction agent and a preparation method and application thereof.The preparation method comprises the following steps that A1, monoglyceride and boric acid are dissolved in methylbenzene and subjected to a heating reaction, triethanolamine is added, the reaction continues, and OBN is obtained; a2, OBN and MoO3 obtained in the step A1 are dissolved in methylbenzene, a heating reaction is conducted in the inert atmosphere, and OBN-Mo is obtained; or B1, dissolving monoglyceride and boric acid in toluene, carrying out a heating reaction, adding triethanolamine, and continuing the reaction to obtain OBN; b2, the OBN obtained in the step B1 and molybdenum acetylacetonate are subjected to a heating reaction in ethyl alcohol, and OBN-Mo-OBN is obtained. Compared with the prior art, the two bio-based sulfur and phosphorus-free nitrogen-containing borate organic molybdenum antifriction agents OBN-Mo and OBN-Mo-OBN can be compounded with ZDDP to prepare lubricating oil, so that the wear resistance of the lubricating oil has a synergistic interaction effect.

The invention discloses preparation and application of a reductive amination catalyst. The preparation method of the catalyst comprises the following steps: step 1, preparing an SrTiO3 carrier; step 2, loading a nickel source into the prepared SrTiO3 carrier to form a nickel-loaded SrTiO3 catalyst precursor; and step 3, roasting the SrTiO3 catalyst precursor to obtain the SrTiO3 loaded nickel catalyst. Large-scale production of the non-noble metal catalyst is realized by adopting a co-precipitation method and an impregnation method which are simple in process and environment-friendly under the condition of room temperature, the obtained material can be used for reductive amination reaction of acetophenone under the condition of taking water as a solvent and shows excellent catalytic performance, and after 50 times of application, the acetophenone conversion rate is gt; the selectivity of alpha-phenylethylamine is gt; the selectivity of the alpha-phenethyl alcohol is 1t; and 2%.

The invention relates to the technical field of carbon fiber composite materials, and particularly discloses a carbon fiber composite material and a preparation method thereof. The carbon fiber composite material is obtained by compositing a layer of carbon fiber sheet between two pieces of polyimide foam, the carbon fiber sheet is subjected to modification treatment before compositing, and the modification treatment comprises the following steps: S1, putting a carbon fiber sheet raw material into a Tris-HCl buffer solution, adding dopamine hydrochloride, stirring for reaction, washing with water and ethanol, and drying to obtain a carbon fiber sheet precursor; drying to obtain a pretreated carbon fiber sheet; s2, nickel hydroxide nanosheets are taken and dispersed in an ammonia water-ammonium chloride buffer solution, the pretreated carbon fiber sheets are soaked and oscillated, washed with water and ethyl alcohol, dried and then put into a mixed solution of ferric chloride nonahydrate and sodium fluoride, after a stirring reaction is conducted, washing with water and ethyl alcohol is conducted, and finally drying is conducted. The carbon fiber composite material disclosed by the invention can keep relatively excellent dimensional stability and structural integrity when being influenced by frequent and violent temperature change.

Resin-based carbon material microspheres, a preparation method therefor, and the use thereof, belonging to the field of carbon materials. The preparation method comprises the following steps: (1) mixing an alcohol-soluble phenolic resin with ethanol and water to obtain a resin dispersion liquid, the volume fraction of ethanol in the resin dispersion liquid being 30-80%, and the concentration of the resin dispersion liquid being 0.01-0.10 g / ml; (2) freeze-drying the resin dispersion liquid to obtain resin microspheres; and (3) carbonizing the resin microspheres in a protective atmosphere to obtain the carbon material microspheres. The preparation process involves a simple route and low raw material cost and thus facilitates mass production. The prepared carbon material microspheres are at the nanoscale and have a specific surface area up to 659.06 m2 / g and a pore volume reaching 0.2787 cm3 / g, and thus can be used as an adsorption carrier, a drug delivery carrier, an energy storage carrier or a catalytic carrier, etc.

The invention discloses an on-line extraction self-optimization method for acanthopanax sessiliflorus flavone based on reinforcement learning. According to the method, multi-source data in the extraction process is collected in real time, and a fusion feature vector is generated after preprocessing; establishing a mapping relation from the feature vector to the contents of rutin, quercetin, kaempferol and hyperoside by using an offline test sample, and constructing a virtual measurer capable of outputting a target flavone composition vector and uncertainty thereof; constructing a safety domain boundary according to a solvent flash point temperature, an equipment tolerance temperature upper limit and a component thermal degradation temperature threshold, and calculating a time-varying safety constraint threshold in combination with uncertainty; performing linkage optimization on the temperature, the ethanol volume fraction, the solid-to-liquid ratio, the soaking time and the circulating flow by adopting a reinforcement learning strategy, and comprehensively considering flavone composition deviation and solvent energy consumption by a reward function; and finally, outputting the optimized parameters to extraction equipment for execution. According to the method, online, lossless and self-adaptive process optimization control is realized, inter-batch fluctuation is remarkably reduced, and the resource utilization efficiency is improved.

The invention discloses a preparation method of krill oil microcapsule powder with high oil loading capacity, which comprises the following steps: S1, dissolving zein and an antioxidant into an ethanol solution to prepare a zein ethanol solution; s2, dispersing the solution in the step S1 into a sodium caseinate-anionic polysaccharide solution to prepare a zein / sodium caseinate-anionic polysaccharide particle dispersion liquid for loading the krill oil; s3, carrying out rotary evaporation on the particle dispersion liquid prepared in S2 to remove ethanol, adding purified water to supplement the volume lost by ethanol evaporation, adding krill oil, and homogenizing to prepare krill oil Pickering emulsion; and S4, mixing the krill oil Pickering emulsion prepared in S3 with a maltodextrin solution or a maltodextrin and gelatin solution, and performing spray drying to obtain micro-capsule powder. The micro-capsule powder is obtained by preparing the krill oil Pickering emulsion with excellent freeze-thaw stability and thermal stability and then performing spray drying on the krill oil Pickering emulsion and the auxiliary materials, and the prepared micro-capsule powder is good in stability.

The application provides a self-floating double-layer solar evaporator with Janus characteristics and a preparation method and application thereof, and belongs to the technical field of solar evaporator preparation. The preparation method is as follows: gourd sponge is calcined and ground into carbonized gourd sponge powder, which is dispersed into a polyvinyl alcohol / sodium alginate solution to obtain a dispersion liquid containing the carbonized gourd sponge; the gourd sponge is used as a support, and the polyvinyl alcohol / sodium alginate solution and the dispersion liquid containing the carbonized gourd sponge are sequentially poured, and a double-layer gel containing vertical pores is formed by stepwise freezing; the double-layer gel is thawed and crosslinked through a calcium chloride solution, washed, and freeze-dried to obtain a double-layer aerogel; the photo-thermal surface of the aerogel is sprayed with a silane coupling agent / ethanol solution to complete hydrophobic modification, and the self-floating double-layer solar evaporator with Janus characteristics is obtained. The solar evaporator prepared by the application has a high evaporation rate and has a wide application prospect in the fields of seawater desalination and wastewater treatment.

The invention discloses a surfactant for PVB (polyvinyl butyral) resin powder prepared on the basis of a microreactor and a preparation method of the surfactant. The preparation method of the surfactant comprises the following steps: mixing and dissolving polyvinyl alcohol and water into a polyvinyl alcohol aqueous solution to prepare a solution A, putting acrylic acid or acrylate into a container, adding a mixed solution of ethanol and water, stirring, and adding a mixed solution of ethanol and water to prepare a solution B; respectively injecting the solution A and the solution B into a high-pressure piston intermediate container, connecting the high-pressure piston intermediate container with an inlet of a microreactor through a pipeline, starting a delivery pump, and synchronously injecting liquid into the microreactor; and carrying out graft polymerization reaction in the microreactor, enabling the reacted liquid to flow out of the microreactor, and carrying out cooling, dehydration and drying treatment to obtain the surfactant. The prepared surfactant has surface activity functions such as good dispersity, thermal stability and environment-friendly performance, and can be applied to the fields of high-performance PVB powder, optical materials, ink resin and the like.

The invention relates to the technical field of palladium recovery, in particular to a method for recovering palladium. According to the technical scheme, the method comprises a precipitant pre-synthesis stage, a targeted palladium precipitation stage and a multi-stage reduction purification stage, and the precipitant pre-synthesis stage comprises the step of adding 10-15 parts by mass of butanedione, 18-30 parts by mass of hydroxylamine hydrochloride and 0.1-0.3 part by mass of iron phthalocyanine into a reaction kettle. Through a composite precipitator system and a multi-stage reduction process, the method has safety and high efficiency: flammable and explosive solvents such as ethanol and highly toxic reducing agents such as hydrazine hydrate are not needed, so that the potential safety hazard of production and the environment-friendly treatment cost are remarkably reduced; high-selectivity capture and efficient reduction of palladium are achieved through magnetic separation of magnetic nano-microspheres, induced precipitation of nitrogen-doped graphene quantum dots and a staged temperature-control and pressure-control reduction technology, the palladium recovery rate and purity are high, the process period is short, operation is controllable, and the method is suitable for industrial continuous production.

The invention discloses a directional preparation method of a high-stability dark brown pigment and an application of the high-stability dark brown pigment in an acid beverage, and relates to the technical field of food additives. The preparation method comprises the following steps: S1, crushing raw dark green tea raw materials, mixing the crushed raw dark green tea raw materials with water, adjusting the pH value to 9-12, carrying out heating extraction, and collecting a supernatant; s2, repeatedly concentrating the supernate to obtain a concentrated solution; s3, adding an ethanol solution into the concentrated solution, standing, and collecting a precipitate; and S4, volatilizing the ethanol in the precipitate, re-dissolving, taking the supernatant, and drying to obtain the product. By optimizing the extraction and purification process, the dark brown pigment with high extraction rate and high color value is successfully prepared, the dark brown pigment shows excellent stability in a wide pH range and under the conditions of high temperature and high pressure, and the pigment obtained by the invention can be used as a natural brown coloring agent with excellent performance, is widely applied to the field of acid beverages, and has wide application prospects. Meanwhile, an effective way is provided for high-value utilization of dark tea resources.

Devices, systems, and methods for measuring properties of liquids or surrounding gasses within a sealed container. Some embodiments of the devices, systems, and methods disclosed herein are useful for determining and monitoring alcohol (ethanol) content of a liquid within a sealed container. Some embodiments are also useful for determining and monitoring additional properties of the liquid within the sealed container, such as liquid depth (volume) and / or presence of trace chemicals and flavor components.

The present application belongs to the technical field of silica sol preparation, and particularly relates to a silica sol preparation method using ion exchange method. In the prior art, the silica sol growth time is shortened by optimizing the preparation and impurity removal process, and the silica sol seed mother liquor is prepared under ultrasonic assistance. The organic alkali catalyst maintains the silica sol growth pH and the metal ions in the complex solution, so that the impurities are reduced during the silica sol growth. After the introduction of dodecyltrimethoxysilane, hexadecyltrimethoxysilane and methyltrimethoxysilane as the hydrophobic group surface modification, the impurity metal ions are filtered through the complexing agent and the ammonium type resin. The three ethylene tetramine ethanol solution modifies the ammonium type resin, enhances the selective adsorption of the resin to the metal ions, and the maleic anhydride crosslinking agent and nano silicon dioxide modify the ammonium type resin, increase the service life of the ammonium type resin. The prepared silica sol has high purity, good mechanical properties and dispersibility, and excellent hydrophobic performance.

The invention relates to the technical field of electroluminescent materials and devices, in particular to an alcohol-soluble host material for a carbon dot electroluminescent device as well as a preparation method and application of the alcohol-soluble host material. The alcohol-soluble host material for the carbon dot electroluminescent device has a structure as shown in a formula I. According to the invention, phosphate ester is introduced into the alcohol-soluble host material as a side chain, so that on one hand, the solubility of the host material in ethanol can be effectively improved, and on the other hand, the film-forming ability of the host material can be effectively improved. Diphenylamine, carbazole and carbazole derivatives are used as donors, triazine is used as an acceptor, and the host material can be endowed with the characteristic of bipolar transmission. Test results show that the alcohol-soluble host material provided by the invention has excellent alcohol solubility and film-forming ability comparable to that of a polymer host material, and also has good hole and electron transport ability, so that carrier transport is effectively balanced, and the luminous efficiency of a host-guest doped electroluminescent device is improved.