3144results about How to "Reaction is easy to control" patented technology

A process for synthesizing biologic diesel oil from raw oil material features that the short-chain ester of fatty acid (methyl acetate or ethyl acetate) is used as acyl receptor and the biologic enzyme is used to catalyze the transesterifying reaction of oil, and includes such steps as transesterifying reaction between said ester of fatty acid and oil to obtain biologic diesel oil and glyceride triacetate, and reaction between said glyceride triacetate and methanol to obtain short-chain ester for fatty acid for cyclic use.

The invention discloses a nitrogen and sulfur co-doped graphene. The method comprises the following steps: grinding and uniformly mixing graphene or a graphene derivative, a nitrogen-containing compound and a sulfur-containing compound, carrying out thermal annealing under the protection of an inert gas at a temperature of 500-1000DEG C, maintaining the temperature for 1-5h, and cooling to room temperature to obtain the nitrogen and sulfur co-doped graphene, wherein content of the nitrogen element in the nitrogen and sulfur co-doped graphene is 1-10at.%, and the content of the sulfur element in the nitrogen and sulfur co-doped graphene is 0.5-2at.%. The method has the advantages of simple technology, low cost, easy control of the reaction process and the like, is suitable for the industrial large-scale production, and can be used in the super capacitor field, the sensor field, the catalytic field, the fuel battery field, the lithium air battery field and the like.

The invention relates to a chemical method for in-situ large-area controlled synthesis of a perovskite type CH3NH3PBI3 membrane material based on a lead simple-substance membrane. The method comprises: sputtering the lead simple-substance membrane on the surface of a substrate, then horizontally immersing the substrate material possessing the lead simple-substance membrane in an organic solution containing a simple substance iodine and iodinated methylamine, and performing a constant-temperature reaction to prepare a CH3NH3PBI3 membrane material in situ; or putting the substrate possessing the lead simple-substance membrane in a steam atmosphere of a simple substance iodine to perform iodination to generate a lead iodide membrane, then immersing in an organic solution containing iodinated methylamine, and performing a constant-temperature reaction to prepare the CH3NH3PBI3 membrane material in situ. The method is simple in operation, low in energy consumption and low in cost, and has wide industrial application prospect. The obtained CH3NH3PBI3 membrane is high in purity, uniform in membrane-surface crystal and excellent in crystallinity.

The invention relates to a catalyst for decomposing hydrogen sulfide by photocatalysis and a preparation method of hydrogen and liquid sulfur by employing same. The catalyst comprises a carrier, active component and assistant and has the characteristics that the carrier is one or more selected from vanadate, niobate and tantalate, the active component is one or more selected from alkali metal hydroxide, alkaline earth metal hydroxide, alkali metal nonmetal oxysalt, alkali metal nonoxysalt, alkaline earth metal nonmetal oxysalt and alkaline earth metal nonoxysalt and the assistant is lanthanide oxide or VIII group oxide. The catalyst of the invention can be used for preparing hydrogen and liquid sulfur so that the produced sulfur is easy to be separated from the catalyst, the catalyst can be recycled and the sulfur contained in hydrogen sulfide can be fully recycled, thus realizing the comprehensive utilization of hydrogen sulfide.

The invention discloses an oxydol etching solution for copper-molybdenum alloy films. The etching solution is free of fluorides, and comprises the following main components in percentage by weight: 1-35% of hydrogen peroxide, 0.05-5% of inorganic acid, 0.1-5% of hydrogen peroxide stabilizer, 0.1-5% of metal chelator, 0.1-5% of etching additive, 0.1-5% of surfactant, 0.1-5% of defoaming agent and the balance of deionized water. The etching solution has the advantages of no environment pollution, mild and controllable reaction, proper cone angle after etching, small CD loss, favorable defoaming property and higher overall performance, and lays foundation for high-precision processing.

The invention discloses a cubic phase cerium and zirconium based composite oxide with high specific surface area. Rare earth elements are doped in the cerium-zirconium composite oxide and are selected from two or three of Pr, Nd and La, wherein the molar ratio of Zr to Ce is (1.8-2.5):1; the molar ratio of Pr to Ce is (0-0.32):1; the molar ratio of Nd to Ce is (0-0.32):1; the molar ratio of La toCe is (0-0.16):1; and the cerium and zirconium based composite oxide exists in a form of cerium-zirconium solid solution. The invention also discloses a preparation method of the cerium and zirconiumbased composite oxide. The composite oxide is prepared through different precursor precipitating and drying methods; the method has the advantages of simple reaction process and low requirements on drying equipment; the obtained cerium and zirconium based composite oxide has high specific surface area, high thermal stability and high oxygen storage and discharge capacity; and after sintering is performed at the temperature of 1,000 DEG C for 12 hours, the specific surface area is more than 35m<2>/g, particularly more than 60m<2>/g.

The invention provides a preparation method of a nickel-cobalt layered bimetallic hydroxide/graphene electrocatalyst, which belongs to the technical field of electrocatalysts. The method disclosed bythe invention comprises the following steps: graphene and cobalt nitrate are uniformly dispersed in a methanol solvent by ultrasonic waves, so that an ultrasonic solution is obtained; the ultrasonic solution is added into a methanol solution of dimethylimidazole, is uniformly mixed and then is enabled to stand, and centrifuging, washing and drying are then carried out, so that a ZIF-67/graphene composite material is obtained; the ZIF-67/graphene composite material and nickel salt are mixed and dissolved in a solvent, refluxing is carried out for reaction, centrifugal separation is then carriedout, obtained precipitate is washed with absolute ethyl alcohol, and drying is carried out to obtain a NiCo LDH/G composite material with a nanoscale morphology. The method disclosed by the inventionovercomes the defects of high requirement on equipment, need for high temperature and high pressure and need for an expensive surfactant existing in conventional synthesis methods, and compared withthe prior art, the preparation method has the advantages of simple process, low cost, easy reaction process control and the like, and is suitable for industrial mass production.

The invention relates to a preparation method of an aqueous polyurethane emulsion with a high solid content. The method comprises the following steps: first, adding polymer polyol, polyisocyanates, catalyst and chain extender into a reactor according to certain steps, and controlling hydrophilic groups to distribute on molecular chain ends; then adding polyisocyanates to form a performed polymer terminated with an NCO group; then reducing system temperature, adding a neutralizer for neutralization, adding deionized water, and stirring with high speed to carry out water dispersion; at last, adding a post chain extender to carry out chain extension in water; removing the solvents under a reduced pressure after reaction to obtain the aqueous polyurethane emulsion. According to the invention, hydrophilic efficiency of the hydrophilic groups is raised to lower intake amount of hydrophilic groups, and a small amount of solvents are added in the reaction to lower a system viscosity. The aqueous polyurethane emulsion prepared by the invention has characteristics of high solid content, low viscosity, good water resistance and stabile storage, and can be used in industries of paint, adhesive, leather finishing and fabric arrangement, etc.

The invention discloses micro-nano copper powder and a preparation method thereof. The preparation method comprises the following steps that compounds containing copper are prepared into a solution, and a system A is obtained; pH conditioning agents, additives and reducing agents are added to the system A, and a system B is obtained and reacts at 50-100 DEG C; and filtration, washing and drying are conducted after reacting, and the micro-nano copper powder is obtained. In the system B, the molarity of the compounds containing copper is 0.001-4 mol/L, the concentration of hydroxyl ion (OH-) is 10<-4>-20 mol/L, the mass concentration of the additives is 0-40%, and the molar ratio of the compounds containing copper to the reducing agents is 1:0.1-100. According to the preparation method, the effective control over the morphology and the size of the micro-nano copper powder is achieved, and the mass content of the impurity phases in the prepared copper powder can be controlled below 0.3%; and in addition, the preparation method further has the advantages that the reaction process is easy to control, and the selected reducing agents are moderate in reducibility, non-toxic, and environmentally friendly.

The present invention belongs to the field of polymer film preparing technology, and is especially method of modifying hydrophilicity of polyvinylidene fluoride film. The method combines blending and surface grafting technology, and includes the first blending polyvinylidene fluoride and one other photosensitive polymer and preparing microporous or compact film, and the subsequent surface grafting hydrophilic monomer onto the surface of the blend film. The prepared modified film has excellent chemical stability and mechanical performance similar to that of microporous polyvinylidene fluoride film as well as improved surface hydrophilicity and antifouling performance.

The invention relates to a green, economical and sustainable method for preparing nanocellulose fibrils. The preparation method comprises the following steps that 1, a cellulose raw material is added to a citric acid solution to be heated, stirred and hydrolyzed; 2, treated cellulose and hydrolysate are separated through methods of centrifugal sedimentation and the like, and precipitated cellulose is centrifugally washed with water multiple times and diluted into a cellulose suspension; 3, the separated hydrolysate can be directly recycled at least once, citric acid is recovered from the recycled hydrolysate, and the citric acid obtained through recovery can be recycled continuously; 4, the natural structure of the cellulose suspension obtained in the second step is further destroyed through a high pressure homogenizer or ultrasonication or physical mechanical treatment of a disc mill, and the colloidal nanocellulose fibrils are obtained. According to the method for preparing the nanocellulose fibrils, a catalyst is not adopted, the reaction condition is relatively mild, the reaction is easy to control, operation is easy, and the method is friendly to environment.

The invention provides a novel method for separating gold and silver from gold slime, which comprises: wet gold slime is subjected to one-step chloridizing leaching and filtered; filtrate is a gold-containing solution, and filter cakes are silver chloride deposit; the gold-containing solution is reduced to obtain gold powder which is then smelted into gold ingots; and the filter cakes, namely the silver chloride deposit, are converted into coarse silver powder which are then smelted into silver ingots. The method adopts one-step chloridizing gold leaching reaction to overcome the defect of large metal loss due to long pretreatment flow of the gold slime and high frequency of filtration reaction in the prior art, only uses a hydrochloric acid and sodium chlorate during chloridizing and gold leaching, is easy to control the reaction, removes the process of pre-leaching the gold slime and removing impurities in the prior art, removes multi-step reduction, reduces the processing step, greatly reduces the discharge amount of wastewater, reduces the heating duration, saves the cost of water and electricity, and improves the recovery rate of the gold and the silver and the quality of the gold ingots and the silver ingots.

The present invention relates to the preparation of Timisatan as one active component for antihypertensive medicine. The carboxylic ester derivative is first obtained through the nucleophilic substitution reaction between some intermediate and 4'-bromomethyl biphenyly-2-carboxylic ester, and then hydrolyzed to eliminnate protection radical and to obtain the destination product. In the technological process of the present invention, methyl radical and ethyl radical are used as protecting radical, and this facilitates and stabilizes the preparation of 4'-bromomethyl biphenylyl-2-methyl carboxylic ester and 4'-bromomethyl biphenylyl-2-ethyl carboxylic ester, and results in easy to control reaction with the intermediate, less impurity, easy elimination of protecting radical and high product yield and quality.

The invention relates to silicon oxide sphere particles, concretely to a preparation method for organic-inorganic hybrid silicon oxide nanospheres with a structure of yolk-eggshell. The invention provides a yolk-eggshell-type organic-inorganic hybrid silicon oxide or a carbon-silicon composite nano-material with adjustable particle size, adjustable core-shell composition and hierarchical pore structure, and the preparation method thereof. In an alkaline system, nanometer silicon oxide spheres with core-shell structures are composed by taking a cationic surfactant as a structure-directing agent. Organosilicon precursor is added to the system. After being stirred, filtered and dried, the organic-inorganic hybrid silicon oxide nanospheres with freely mobile cores and functionalized mesoporous shells are obtained.

The invention discloses a preparation method of regenerated polyester fibers. The preparation method is used in the field of chemical regeneration of waste polyester. According to the method, a glycol titanium alkali metal coordination compound which can be dissolved in ethylene glycol is used as a catalyst for catalyzing ethylene glycol in a waste polyester product for depolymerization and a repolymerization process of depolymerized products; the catalyst is higher in catalysis activity in ethylene glycol depolymerization of polyester and the repolymerization process of the depolymerized products; therefore, in the preparation method of the regenerated polyester fibers, the catalyst is not required to be removed from the depolymerized products in a regenerated polyester fiber preparation process, and can be used for polycondensation, so that the depolymerized product separation and purification cost is greatly reduced, and the quality of regenerated polyester is guaranteed; the color and the intensity of the regenerated polyester fibers can be obviously improved, and continuous closed-loop recycling of the waste polyester product can be realized.

The invention relates to the field of magnetic nano composite materials, and discloses a iron-nickel alloy/nickel ferrite magnetic composite nanofiber and a preparation method thereof. The diameter of the composite nanofiber is 50-300 nm. The preparation method adopts a electrostatic spinning technique and comprises the following steps: using water and ethanol as solvents and polyvinyl pyrrolidone (PVP) as a complex agent, reacting PVP with nickel salts and ferric salts to preparing a precursor solution; electrostatic-spinning to prepare a precursor fiber; drying, carrying out heat treatment in the air atmosphere, and carrying out reduction treatment on the product in the hydrogen atmosphere under appropriate conditions, thereby obtaining the ferronickel/nickel ferrite magnetic composite nanofiber. The method and the route have the advantages of easy control of reaction process, low sintering temperature, simple device and technique, convenient operation, small environmental effect and the like. The method and the technical line are also applicable to preparation of composite nano fiber materials of other magnetic metal or alloy and ferrite.

A method for preparing n-3PUFA marine glyceride through adopting enzyme method includes following steps: refined fish oil is made into n-3PUFA condensate through saponification, acidification and urea adduct method; lipase catalyzes the synthesis reaction between n-3PUFA and glycerol; n-3PUFA marine glyceride is extracted and separated; moreover, n-3PUFA is effectively concentrated in glyceride to be made into functional products which can prevent and cure cardiovascular diseases and nourish the brain and improve intelligence. The raw material of the invention, n-3PUFA, is extracted from natural fish oil, thereby being safe and effective; during production, nitrogen protection is adopted without adding synthetic antioxidant, thereby effectively preventing oxidation of n-3PUFA; with scientific and reasonable technique, the invention completes synthesis by means of biological enzyme method along with high esterification degree of reaction, higher utilization rate of raw material and easily controlled reaction process; therefore, the invention has wide market prospect.

The present invention discloses a microwave producing method for nano-silver or gold; the reactants are added into the reactor according to the proportion of 1 to 1; the reactants are silver nitrate or auric chloride acid and starch or sodium carboxymethyl cellulose; the reactor is put into a microwave oven; with a mixer of a rotation speed of 100/min and the microwave power of 0.3 Kw, the reaction time of the reactant starch is one hour while the time of the reactant sodium carboxymethyl cellulose is seven hours; the solution is dried by air or vacuum freeze or spraying after the reaction is over to produce nano-silver or gold powder or concentrated to nano-silver or gold colloid of the needed consistency through vacuum concentration. The present invention discards the ordinary reducing agent in thermochemical synthesis and takes the microwave heating to replace the traditional local heating method and realize homogeneous growing of nano-silver or gold; the grain size distribution of the nano-silver and gold is narrow and the grain shapes are regular; the method is widely used in biochemical and antiseptic material field.

The invention relates to a preparation method of waterborne polyurethane/graphene nano-composite emulsion, and belongs to the field of organic-inorganic nano-composite materials. According to the preparation method, graphene oxide dispersion liquid is prepared by adopting an improved Hummers method, and is compounded with waterborne polyurethane to obtain the waterborne polyurethane/graphene nano-composite emulsion. By use of the preparation method disclosed by the invention, the waterborne polyurethane/graphene nano-composite emulsion is prepared by taking oligomer polyol as a soft segment, taking an isocyanate compound as a hard segment and carrying out in-situ introduction of the graphene oxide dispersion liquid in the preparation process of the waterborne polyurethane. The mechanical property, antistatic property, conductive property, electromagnetic shielding property, thermal conductivity, chemical resistance, corrosion resistance and the like of a waterborne polyurethane film and a coating are effectively improved by introducing grapheme. The waterborne polyurethane/graphene nano-composite emulsion has a better application prospect in the fields of coating materials, adhesives, ink, surface treatment agents, elastomers, foaming materials, functional films and the like.

The invention belongs to the technical field of carbide ceramics, and concretely relates to a high-entropy boron-containing carbide ultrahigh temperature ceramic powder and a preparation method thereof. The molecular formula of the ceramic powder is XCyBz, wherein X is at least two of Zr, Ti, Hf, V, Nb, Ta, Cr, Mo and W, y is equal to or more than 0.6 and less 1.0, z is more than 0 and equal to orless than 0.4, and y + z = 1. The ceramic powder has a single phase face-centered cubic structure. The preparation method comprises the following steps: carrying out ball-milling mixing on at least two metal powders and C powder, carrying out pressureless plasma sintering and crushing to obtain carbide powder, mixing the carbide powder with B2O3 powder and a carbon source, and then performing high temperature sintering and crushing to obtain the ceramic powder. The ceramic powder is a single-phase solid solution, has the face-centered cubic structure, and contains the boron element, so the ceramic powder integrates the high temperature resistance of carbides and the oxidation resistance of borides, and can be used to prepare an ablation and oxidation resistant high-entropy boron-containing carbide ultrahigh temperature ceramic block or composite material.