99results about How to "Avoid harsh conditions" patented technology

The invention discloses a preparation method of lithium metal through electrolysis, which comprises the following steps: at normal temperature and normal pressure, applying direct current voltage on an anode current collector and a cathode current collector so that potassium ions in a water phase in an anode chamber penetrate through a diaphragm having lithium ion conductor characteristics under the driving of the voltage, an organic solvent in a cathode chamber is reduced to a metal lithium single substance which is deposited and enriched on the surface of the cathode current collector to obtain the product, wherein the anode chamber of an electrolysis cell is filled with an aqueous solution at least containing the lithium ions, the cathode chamber od the electrolysis cell is filled with the organic solvent having the lithium ion conductor characteristics, the diaphragm for separating the anode chamber from the cathode chamber is a lithium ion conductor ceramic membrane having the lithium ion conductor characteristics or a composite membrane of a lithium ion conductor and a polymer, and the cathode chamber is in inert gas atmosphere. The electrolysis preparation method for lithium metal avoids severe conditions which are required to prepare lithium metal by a traditional high temperature molten electrolysis process, and has the characteristics of low energy consumption, high lithium extraction efficiency and high product purity and is environment-friendly and wide in raw material sources.

The invention relates to a network data transmission method for a distributed opportunistic relay, belonging to wireless network transmission technical field. In bidirectional wireless network transmission, a plurality of candidate relay nodes select one relay node to participate in cooperation through distributed selection count; the originating nodes decide whether to adopt the direct transmission mode or the relay transmission mode, which satisfies the quality of service of the system and meanwhile reduces power consumption. The relay nodes judge whether to forward the data and calculate the optimized transmitted power of the data and send the data from a plurality of originating nodes to a plurality of destination nodes at the same time after conducting network coding to the data. The destination nodes receive the data through maximum likelihood method and maximum ratio combining method at the receiver terminals and decode the received information. The network data transmission method can carry out combinatorial optimization to the selection, the network coding and the power splitting of the relay nodes through distributed control mechanism under the condition that only part of the information of the channel status is provided, and can be effectively used in an energy-effective bidirectional-transmission wireless network.

The invention relates to a method for preparing functional modified hollow mesoporous or core / shell mesoporous SiO2 nanometer granules. The method comprises the following steps of: (1) synthesizing, namely mixing a silane coupling agent with long-chain functional groups and a silicon source uniformly, adding the mixture into an alkaline solution containing monodisperse SiO2 nanometer particles, and performing centrifugal separation on a reaction product to prepare solid core / shell mesoporous SiO2 nanometer spheres; and (2), dispersing the solid core / shell mesoporous SiO2 nanometer spheres prepared in the synthetic process in the alkaline solution, and performing hydro-thermal reaction to obtain the functional modified hollow mesoporous or core / shell mesoporous SiO2 nanometer granules. According to the method, the synthesis and functional modification of the hollow or core / shell mesoporous SiO2 nanometer granules can be implemented synchronously by the process. By the process for synthesizing the functional hollow or core / shell mesoporous SiO2 spheres 'synchronously', the blockage of pore channels in shells by a post modification method is avoided, and the process is simple and easy, pollution-free, high in yield, low in cost and high in efficiency.

The invention provides a method for preparing a hydrolysis-regulated nickel cobalt sulfide / carbon cloth porous supercapacitor electrode material. The method comprises the preparation of a cobalt-basedmetal organic frame / carbon cloth composite material, the preparation of a porous nickel-cobalt layered double-metal hydroxide / carbon cloth composite material and the preparation of a porous nickel cobalt sulfide / carbon cloth composite material. According to the invention, in the preparation process of the porous nickel-cobalt layered double-metal hydroxide / carbon cloth composite material, holes are generated through the ion exchange of a cobalt-based metal organic frame material Co-MOFs and a nickel nitrate solution and the etching of Co-MOFs by a Ni2+ hydrolysis effect, the nickel-cobalt layered double-metal hydroxide with a hollow porous structure grown on carbon cloth is synthesized, on the basis of maintaining the shape of a MOFs parent body, a hollow porous morphology structure of abinary metal sulfide with multiple valence states, large specific surface area and high electroactivity based on the carbon cloth is prepared, and the capacitance property, rate performance and electrochemical cycle life of the composite material as an electrode are improved.

The invention discloses a synthetic process of key intermediate of hemifumarate tenofovir alafenamide. A synthetic route is shown below. The synthetic process has the advantages that the strict conditions of the prior art are avoided, the reaction steps are simplified, the raw materials are easy to obtain, reaction is moderate, the cost is lower and the synthetic process is suitable for industrial production.

The invention discloses a polylactic acid (PLA) composite material with a high degradation speed and a preparation method of the composite material. The composite material provided by the invention isprepared by adopting polylactic acid resin, PBAT resin, an inorganic filler, modified starch, an organic nucleating agent, a coupling agent, a chain extender, a compound photosensitive initiator, a thermal oxygen degradation initiator and a food-grade plasticizer, the heat resistance of the polylactic acid material is improved, and the use range of polylactic acid products is expanded; thermal degradation, photodegradation and hydrolysis speeds of wasted PLA products are increased, harsh conditions that require industrial composting are avoided, and the degradation speed faster than that of ordinary polylactic acid can be realized under natural conditions; the auxiliary agents used in the method are all food-grade raw materials and can be applied to food packaging; and the preparation method of the polylactic acid composite material with the high degradation speed provided by the invention employs simple equipment and is low in investment.

The invention discloses a process for extracting krill krill oil, co-produced protein and chellotosan from antarctic krill powder. The process comprises the following steps: 1, krill oil is extracted, wherein the phospholipid content of the krill oil is 38-45%, and the astaxanthin content of the krill oil is 240-350 mg / kg; 2, protein is extracted, and the yield of the protein extracted through the alkali-solution and acid-isolation method is 30-36%; 3, chellotosan is prepared, alkali deproteinization and acid decalcification are performed on shrimp shells, and the deproteinization and decalcification operations are repeatedly performed for two times to prepare high purify chellotosan, and the yield of the chellotosan is 13-21%. According to the invention, three types of high purify products, namely the krill oil, the protein and the chellotosan, are extracted in sequence, so that the comprehensive utilization ratio of a raw material and the added value of products are greatly improved; the antarctic krill is replaced by the antarctic krill powder, so that the rich raw material source is realized, the severe conditions are avoided during storage and transformation of the antarctic krill, and the process is suitable for large scale industrial production; during the production process, the cyclic utilization of organic solvents, waste liquor and waste residue, and high value and efficient comprehensive utilization of sources are realized.

The invention discloses a preparation method of highly-hydrophobic silicon dioxide aerogel. The preparation method comprises the following steps: ultrasonically dispersing Fe3O4 nano micro-spheres into an ethanol solution; adding ethyl orthosilicate, dimethylformamide and 3-aminopropyl trimethylsilane at room temperature; after uniformly stirring, adding NH3.H2O and curing; and finally, carrying out surface hydrophobic modification through methyltrimethoxysilane to prepare the highly-hydrophobic silicon dioxide aerogel. The silicon dioxide aerogel disclosed by the invention has high chemical stability, relatively large specific surface area, excellent mechanical properties, and high recycling utilization ratio, still has relatively high adsorption capability and hydrophobic property after being repeatedly utilized, has good durability, and has a wide application prospect in the aspect of industrial large-scale oil pollution treatment.

Methods of obtaining a sample of target nucleic acid from cells containing the target nucleic acid and genomic DNA or RNA are disclosed. In contrast to prior art protocols, this method does not require the cells containing the target nucleic acid to be lysed and instead is based on the observation when cells are suspended in an aqueous medium and the target nucleic acid are released into the medium through the cell walls. The invention therefore helps to avoid the use of cell lysis, heating, extremes of pH, water immiscible solvents, and electrical fields used in prior art nucleic acid extraction methods. The present invention is particularly applicable to the separation of non-genomic nucleic acid, such as cellular vector DNA or RNA, self-replicating satellite nucleic acids or plasmid DNA, from genomic nucleic acids, such as host cell chromosomes and ribosomal RNA.

The invention relates to an artificial wetland high-efficiency pre-aeration sewage treatment system, which comprises a bar screen, a primary sedimentation tank, a venturi, a splash board and an artificial wetland connected in turn, wherein the bar screen is positioned in the front of the primary sedimentation tank; the inlet of the gradually reducing part of the venturi is connected with the upper part of the primary sedimentation tank through a high-pressure pump, the throat part is connected with the atmosphere through an air inlet pipe, and the outlet of the gradually expanding part is provided with a jet pipe extending forwards; and the splash board is positioned above the artificial wetland in front of the jet pipe. The artificial wetland adopts a horizontal baffling structure, the water outlet is provided with a water storage tank, and the water storage tank is provided with a backflow pipe connected with the water inlet end of the artificial wetland. The artificial wetland high-efficiency pre-aeration sewage treatment system has a simple structure and reasonable process, and through the high-efficiency aeration of the venturi and the splash board, the artificial wetland high-efficiency pre-aeration sewage treatment system improves the biochemical reaction types and the reaction speed in the artificial wetland, improves the surrounding environment, and is helpful to improve the purification degree of the yielding water of the artificial wetland. The artificial wetland high-efficiency pre-aeration sewage treatment system has the advantages of simple structure, convenient operation and good adaptability, allows the sewage quantity to have large range of variation, and is mainly adapted to the treatment of domestic sewage.

The invention discloses a method for preparing metal sodium through electrolysis. The method comprises the following steps: at normal temperature and normal pressure, applying a direct current voltage to and an anode and a cathode to drive sedum ions to selectively penetrate through a sodium ion selective permeability diaphragm from an anode region to a cathode region based on the cathode as a negative potential and the anode as a positive potential, and reacting at the inert gas atmosphere so that metal sodium is electrolysized and reduced at the cathode, wherein the anode region of an electrolytic cell is filled with an aqueous solution containing sodium ions, the cathode region is filled with a non-aqueous solvent with a sodium ion conductivity, and the anode region and the cathode region of the electrolytic cell are separated by the sodium ion selective permeability membrane. The method for preparing metal sodium through electrolysis under mild conditions avoids severe conditions which are required to prepare sodium metal by a traditional high temperature molten electrolysis process, can greatly reduce the energy consumption, and further lowers adverse impacts on the environment.

The invention provides a preparation method of bamboo joint structure Mn2O3. According to the method, at first, rod-metal organic framework material Mn-MOF precursors are prepared by a guide agent assisting solvent volatilization method; then, in the air environment, the Mn-MOF precursors are calcined; the calcining temperature is controlled to be 400 to 650 DEG C; the time is 2 to 4h; finally, the materials are cooled to the room temperature along with the furnace temperature; the bamboo joint structure Mn2O3 nanometer structure materials can be obtained. The method provided by the invention has the advantages that the operation is simple; the process cost is low; the appearance is regular; the product stability is high, and the like. The industrial production is facilitated. The bamboo joint structure Mn2O3 nanometer structure material obtained by the method has the advantages of good conductivity and great specific surface area; the electrode resistance can be favorably reduced; the materials can be used for supercapacitor electrode materials.

The invention provides a carbon-coated K<0.7>Fe<0.5>Mn<0.5>O<2> inner connecting nanowire material and a preparation method thereof. K<0.7>Fe<0.5>Mn<0.5>O<2> nanocrystals are coated with a graphitized carbon layer to form nanowires with diameter of 50-150nm; and the nanowires are connected in a staggered manner to form a one-dimensional net-shaped structure, wherein the content of the surface carbon layer is 4.0 to 8.0wt.%. The inner connecting nanowire material, which can be used as a positive electrode material of a potassium ion battery, has high structural stability, and improves cycling stability and rate capability of a positive electrode active material of the potassium ion battery; and the inner connecting nanowire material has the characteristics of low cost of raw materials, simple and environment-friendly process, high product yield, and excellent material electrochemical property.

The invention relates to a preparation method of nanometer platinum doping tungstic oxide with high catalytic activity under visible light, which aims at solving the difficulty of low activity of tungsten oxide photocatalyst and improving the photocatalytic activity of the photocatalyst and expanding the application field of the photocatalyst. The technical scheme is achieved as follows: the preparation method comprises the following steps: firstly, the preliminary treatment of tungstic oxide particles, shown by WO3; secondly, the preparation of the platinum doping tungstic oxide, shown by Pt / WO3; and thirdly, the illumination reaction. The invention can be used for removing the pollutant in air and water, such as dye wastewater emitted by a dye factory with serious environment pollution.

The invention discloses a preparation method of a bilastine key intermediate 2-(4-ethoxy)-phenyl-2-methyl propionate. The method comprises the following steps: carrying out carbonyl reducing reaction on 2-(4-haloacetyl)-phenyl-2-methyl propionate under the action of a catalyst; carrying out cyclization in an alkaline solution; and then carrying out reduction reaction under the action of a catalyst, so as to obtain 2-(4-ethoxy)-phenyl-2-methyl propionate. According to the method disclosed by the invention, the severe condition in the prior art is avoided, and the method is available in raw materials, simple in operation, low in cost, friendly to environment and suitable for industrial production.

The invention relates to the field of organic synthesis, and particularly relates to a preparation method of five-membered bicyclic guanidine compounds. The preparation method of five-membered bicyclic guanidine compounds comprises the following steps: performing amino protection and hydroxy protection on alkamine; performing substitution reaction with imine anions; de-protecting the obtained product with hydrazine hydrate, thus obtaining primary amine; on the other hand, under alkaline conditions, forming the alkamine subjected to amino protection and hydroxy protection into a three-membered cyclamine compound; performing coupling reaction on the primary amine and the three-membered cyclamine compound; and finally, performing ring-closing reaction on the coupling product to obtain the five-membered bicyclic guanidine compounds. Compared with the prior art, raw materials for preparation of the five-membered bicyclic guanidine compounds and intermediate compounds are cheap and accessible; and the technological operation is simple, does not need column chromatography separation and is beneficial to scale-up production, thereby providing a convenient way for preparation of chiral and achiral five-membered bicyclic guanidine compounds.

The invention relates to a kovar alloy and ceramic material ultrasonic brazing method. The kovar alloy and ceramic material ultrasonic brazing method includes the following steps that a to-be-brazed kovar alloy and a to-be-brazed ceramic material are put into acetone to be subjected to ultrasonic cleaning for 5 min to 10 min; the kovar alloy, the ceramic material and brazing filler metal are assembled into a ceramic / brazing filler metal / kovar alloy three-layer structure; the ceramic / brazing filler metal / kovar alloy three-layer structure is put on a heating table to be heated and pressurized, wherein the heating temperature ranges from 830 DEG C to 980 DEG C, and pressure ranges from 0.2 MPa to 1 MPa; ultrasonic vibration is started after the brazing filler metal is molten, wherein the vibration frequency ranges from 10 kHz to 110 kHz, and the amplitude ranges from 1 micrometer to 10 micrometers; and heating stops after the heating time lasts for 20 s to 90 s, pressurizing and ultrasonic vibrating are stopped after a connector brazing seam layer is completely solidified, and a kovar alloy / ceramic brazing connector is obtained. According to the kovar alloy and ceramic material ultrasonic brazing method, under the non-vacuum condition and the condition that no brazing flux is adopted, brazing connection of the kovar alloy and the ceramic material is achieved, meanwhile, the structure of the connector is refined, the residual stress level of the connector is low, and good sealing performance is achieved.

The invention discloses a (Z)-2-sulpho-beta-aminocrotononitrile compound and an electrochemical preparation method thereof, and belongs to the technical field of electrochemical organic synthesis. Thepreparation method comprises the following steps that electrolyte, a sulfur source, an iodine source, acid, organic phosphorus and electrolytic solvents are added into an electrolytic tank without amembrane; an anode and a cathode are inserted; stirring and electrification are performed; reaction is performed under the constant current condition; after the reaction is completed, electrolyte is subjected to organic extraction by an organic solvent; then, separation and purification are performed to obtain the (Z)-2-sulpho-beta-aminocrotononitrile compound. The electrode used by the method isa general inert electrode; the electrode modification is not needed; the additional addition of metal catalysts is not needed; cheap and easy-to-obtain thiophenol (or mercaptan and disulfide) and acetonitrile are used as raw materials; the yield is high; the selection is high; the reaction system is simple and effective; the environment-friendly effect is achieved. The method has the advantages that the reaction is operated at normal temperature and normal pressure; simplicity and safety are realized; the method is suitable for large-scale industrial production.

The invention provides a method of using poly-3-hydroxybutyrate to prepare a liquid fuel; method comprises: adding the catalyst aluminum dihydrogen phosphate and poly-3-hydroxybutyrate into a high-temperature high-pressure reactor, reacting at 210-270 DEG C for 3-12 hours to obtain the liquid fuel. Aluminum dihydrogen phosphate is used as a catalyst herein, poly-3-hydroxybutyrate may be further catalytically converted at the mild temperature (210-270 DEG C) to prepare an oil product; the technical process of the method is simple and convenient to perform, and the method has industrial application prospect; the yield of oil the product is up to 36.9% by weight, the contents of carbon and hydrogen in the oil product are up to 84.5% by weight and 11.5% by weight respectively, and caloric value is up to 42 MJ / kg, which is equal to that of conventional commercial oxygen-bearing gasoline; under catalysis of the aluminum dihydrogen phosphate, the poly-3-hydroxybutyrate is converted into hydrocarbons mainly in decarboxylation form, and the decarboxylation rate is up to 73%.

The invention discloses a method for preparing a high-temperature-resistant circulating type lithium manganate positive electrode material. The preparation method comprises the following steps: usingnano manganese dioxide and battery-grade lithium carbonate as main raw materials; then adding one or more of nano yttrium oxide or nano cobalt oxide as an additive; uniformly mixing main raw materialsand additives in an inclined mixer; pre-sintering the uniformly mixed materials at the temperature of 720-850 DEG C for 18-23 hours; and after sintering, adding at least two of nano aluminum hydroxide, nano magnesium hydroxide, nano zinc oxide or nano titanium dioxide for coating treatment, then sintering at 650-750 DEG C for 12-17 hours, and finally homogenizing and sieving to obtain the high-temperature-resistant circulating lithium manganate positive electrode material. The lithium manganate material prepared by the preparation method disclosed by the invention is uniform in particles, normal in particle size distribution and excellent in processing performance, has higher gram specific capacity, can reach 105 mAh / g or above at 25 DEG C and 1 C gram capacity, has ultrahigh gram specific capacity and excellent cycle performance at the same time, and can reach 1000 times or above at 1 C cycle.

A method for manufacturing an alloy catalyst for a fuel cell is disclosed. The method for manufacturing an alloy catalyst for a fuel cell may include predetermined processes and reaction conditions, such that iridium is alloyed to platinum contained in a cathode carbon support catalyst. Accordingly, time for stabilizing charge on the carbon surface may be reduced and a metal particle size may be controlled, thereby manufacturing high quality products having uniform metal particle distribution and improved durability. In addition, corrosion of a cathode carbon support catalyst in a harsh condition such as vehicle driving may be prevented.

The invention belongs to the technical field of nuclear chemical analysis and test, in particular to a spectrophotometry method for measuring the boron content in a BNCT medicament in a biological sample. The method comprises the following steps: digesting a biological sample; measuring a standard curve, measuring the biological sample, and the like, wherein a developer is 3-methoxy-azomethine H, the maximum detection wavelength is 390-410nm, and the pH value of final measuring liquid is 4-6.5. The analysis method has the advantages of rapidness, simpleness, convenience, specificity, sensitivity, and the like and satisfies the accuracy and precision requirements for measuring the boron content in the biological sample.

A kind of synthetic method of m-trifluoromethyl benzyl nitrile comprises two reaction steps: the first step is a chloromethylation reaction, the second step is a cyanation reaction, and the first step reaction is trifluoromethylbenzene, Paraformaldehyde and chlorosulfonic acid are raw materials, react in the presence of mineral acids to generate m-trifluoromethyl chloromethylbenzene; in the second step reaction, gas chromatography analysis is used to control the organic phase impurity content to be lower than 3%, which is beneficial to the reaction Yield improvement. The method has the advantages of easy-to-obtain production raw materials, simple operation, convenient control, high reaction yield, low production cost, reduced environmental pollution, etc., and is a synthetic method suitable for industrial production.

The invention provides preparation methods of a himbacine analogue and intermediates thereof. The invention specifically provides novel preparation methods of a compound A, a compound 4, a compound D and a compound C. According to the invention, a scheme for preparing the compound A does not require a process for reducing carboxylic acid into aldehyde, but directly oxidizing corresponding alcohol into corresponding aldehyde. The operation is safe. In prior arts, carboxylic acid is first converted into acyl chloride, and acyl chloride is catalytically hydrogenated into aldehyde with a palladium catalyst. In the above process, anhydrous palladium-carbon is needed. With the methods provided by the invention, the above harsh condition is avoided. The preparation methods are simple, and operation steps are easy. Especially, when a hydroxyl group protection group P is benzyl group, nitro group can be reduced into amino group when the protection group P is removed. Therefore, the reaction steps are greatly simplified, and raw materials and agents are saved. The entire route has the advantages of low production cost and high yield, and is suitable for industrialized production.

The invention relates to a denitration agent used for a SNCR flue gas denitration technology. The denitration agent comprises the following components: RO pure water, vehicle urea, liquefied ammonia or ammonia liquor, and a few of an additive. A preparation method comprises the following steps: employing RO pure water for hydrolyzing the vehicle urea, liquefied ammonia or ammonia liquor and the additive are placed in an above solution; wherein the concentration of the vehicle urea in the prepared denitration agent is 20-30%, and the ammonia concentration is 3-7%. The preparation method of the denitration agent is simple, the denitration agent can increase the denitration efficiency, ammonia escape and ammonia blast possibility can be prevented, the severe condition required by ammonia liquor storage and transport can be solved, the environment damage is reduced, and the problems of easy obstruction of the used urea and low denitration efficiency are solved.

The invention discloses a synthetic process of key intermediate of hemifumarate tenofovir alafenamide. A synthetic route is shown below. The synthetic process has the advantages that the strict conditions of the prior art are avoided, the reaction steps are simplified, the raw materials are easy to obtain, reaction is moderate, the cost is lower and the synthetic process is suitable for industrial production.

The surface controllable polymerization process to prepare composite polymer / montmorillonite material includes the following steps: reaction of trimethylamine and halogenated aliphatic acid, the reaction of the product with bromine for 12-48 hr and the reaction of the bromized product with magnesium bromide based dithio benzyl ester for 8-24 hr to obtain omega-acid-omega-dithio benzyl ester-fatty alkyl trimethyl ammonium halide; mixing omega-acid-omega-dithio benzyl ester-fatty alkyl trimethyl ammonium halide and montmorillonite in water through stirring at 40-100 deg.c for 1-48 hr to obtain intercalating montmorillonite; and mixing the intercalating montmorillonite with initiator and monomer in certain weight proportion and reaction at 40-120 deg.c for 4-48 hr to obtain precipitated composite polymer / montmorillonite material. The composite material has high strength, high heat stability, high solvent tolerance and high flame retarding performance.

The invention discloses a synthetic method of 2-((1-benzyl-4-piperidyl)-hydroxy-methyl)-5, 6-dimethoxy-1-indanone, which comprises the following steps of: 1) synthesizing 4-methyl piperidinecarboxylate with methanol, thionyl chloride and 4-nipecotic acid, carrying out benzylation on benzyl chloride taken as benzyl and triethylamine to obtain N-benzyl-4-methyl piperidinecarboxylate; 2) reacting the N-benzyl-4-methyl piperidinecarboxylate with 5, 6-dimethoxy-1-indanone under the catalysis of sodium methoxide to obtain 2-(1-benzylpiperidine-4-carbonyl)-5, 6-dimethoxy-1-indanone; 3) carrying out reducing reaction on the 2-(1-benzylpiperidine-4-carbonyl)-5, 6-dimethoxy-1-indanone with sodium borohydride in methanol to obtain the 2-((1-benzyl-4-piperidyl)-hydroxy-methyl)-5, 6-dimethoxy-1-indanone; and the reaction formula is shown in the specifications. The synthetic method has the beneficial effects that the defects of the prior art can be overcome, the product purity can be further improved, and the production cost can be reduced.