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120results about How to "The reaction process is simple" patented technology

Template-free preparation method of hollow micro-spherical polymers with covalent organic frameworks (COFs)

The invention discloses a template-free preparation method of hollow micro-spherical polymers with covalent organic frameworks (COFs), belonging to the field of inorganic nonmetal materials. The template-free preparation method comprises the steps of firstly, adding an organic aldehyde ligand and an amine ligand into a solvent, adding a certain quantity of additives after dissolving and dispersing, and controlling the reaction temperature, the concentrations of the ligands and the reaction time to obtain a solid sediment; and filtering, washing and drying to obtain hollow microspheres with the COFs. The structural characteristics of the hollow microspheres with the COFs are simultaneously determined by the kinds of the ligands, the reaction time, the reaction temperature and the solvent in the reaction system. The template-free preparation method has the advantages that the application range of a direct synthesis method to COFs synthesis is widened, and the hollow appearances of the polymers are obtained; the prepared hollow microspheres have high porosity which can be up to 85%, and the thickness and surface polarity of a spherical shell can be controlled through regulating reaction conditions in the system; and the method disclosed by the invention is simple in reaction process, high in yield, mild in condition, short in process and suitable for industrial production.
Owner:UNIV OF SCI & TECH BEIJING

Three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material as well as preparation method and application thereof

The invention discloses a three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material as well as a preparation method and an application thereof. The three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material is formed by uniformly loading carbon-coated tin nanometer particles on a three-dimensional graphene network. The preparation method comprises the following preparation processes: fully dissolving and mixing NaCl serving as a dispersing agent and a template with a metallic tin source and a carbon source, carrying out freeze drying, and porphyrizing, thus obtaining a mixture; putting the mixture in a tubular furnace, and calcining under the effect of hydrogen catalysis, thus obtaining a calcined product; and washing the calcined product, thus obtaining the three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material. The preparation method has the advantages that the preparation process is safe and harmless, the operation is simple, the yield is high, and when being used as an anode material for a lithium ion battery, the prepared three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material has relatively high reversible capacity and cyclic stability.
Owner:TIANJIN UNIV

Method for preparing compound powder of alumina and chrome oxide from chromium-containing aluminum sludge

The invention provides a method for preparing compound powder of alumina and chrome oxide from chromium-containing aluminum sludge. The method comprises that contents of Al, Cr, and Fe in the chromium-containing aluminum sludge are weighed, an inorganic acid solution is added according to the contents, and the mixture is heated and stirred until the mixture is completely dissolved; or that the chromium-containing aluminum sludge is heated, the inorganic acid solution is added, and the mixture is stirred while maintaining the temperature till the mixture is completely dissolved; that a required reducing agent is calculated and then added for reaction, after which the solution is kept stand and cooled; that the pH value of the solution is adjusted to 2.5-3.5, the solution is filtered to remove impurities, a liquid dispersant is added to mix the solution evenly, the PH value of the solution is then adjusted to 5.0-7.8 to generate a mixed deposition, the solution is filtered after full settlement to obtain a filtrate and a filter cake, the filter cake is washed till a washing solution contains no Cr(VI), and the washing solution is added into the filtrate; that the washed filter cake is dried; and that the object product is obtained by crushing, grinding and calcining. The method fundamentally solves environmental pollution of the chromium-containing aluminum sludge, and comprehensively utilizes the chromium-containing aluminum sludge. The method is simple in reaction processes and has no by-products, and products of the method are easy to control and reach nano-level granularity. Thus, the method can be used for producing grinding materials, cutting tools and refractory materials.
Owner:BOHAI UNIV

Method for extracting vitamin E from vegetable oil deodorization distillate

InactiveCN101153035AThe reaction process is simpleGood for recycling and utilizationOrganic chemistryMicroorganism based processesStrong acidsGlycerol ester of wood rosin
The present invention discloses a method of extracting vitamin E from plant oil deodorized and distilled substance of plant oil. The present invention has a following technical proposal: through crystallization of previously separated crude sterol and molecular distillation of sterol ester, two types of lipase are orderly used respectively to realize the methyl esterification of free fatty and the esterification of triglyceride in deodorized and distilled substance. Then the molecular distillation technology is used to realize the separation of methyl ester and vitamin E in the fatty acid so as to prepare the concentrated vitamin E product. The present invention uses lipase to replace the conventional strong acid and alkali. Two types of lipase are used to replace the methyl esterification of free fatty and the esterification of triglyceride in deodorized and distilled substance. Compared with the prior art, the reaction of the present invention occur in a mild circumstance; the reaction process is easy to be controlled, and conducive to the recycling and use of vitamin E. Besides, the operation is relatively simple and has no problems of environmental pollution. The purity of concentrated vitamin E can reach above 30 percent.
Owner:ZHEJIANG UNIV OF TECH

Molybdenum disulfide nano-sheet preparation method based on sodium chloride template

InactiveCN105217687ALow costThe reaction process is simpleNanotechnologyMolybdenum sulfidesIonAmmonium molybdate
The invention relates to a molybdenum disulfide nano-sheet preparation method based on a sodium chloride template. The method comprises the following steps: one or a mixture of two selected from ammonium molybdate and sodium molybdate is adopted as a molybdenum source; thiourea is adopted as a sulfur source; the molybdenum source, the sulfur source and NaCl are dissolved in deionized water according to a molar ratio that molybdenum in the molybdenum source to sulfur in the sulfur source is 1:(1.8-2.5) and according to that the molar ratio of molybdenum in the molybdenum source to NaCl is 1:(150-600); freezing and vacuum drying are carried out, such that a mixture is obtained; the prepared mixture is ground into powder; the powder is sieved and is laid in a square boat; the powder is placed in a tubular furnace thermostatic zone, and is subjected to calcining and chemical vapor deposition, such that a product A is obtained; the product A is washed and vacuum-dried, such that the molybdenum disulfide nano-sheets are obtained. with the method provided by the invention, molybdenum disulfide nano-sheets with characteristics of high quality, uniform dimension, relatively controllable layer number, relatively high yield and relatively low preparation cost can be obtained.
Owner:TIANJIN UNIV

Method for preparing 2, 5-furandicarboxylic acid (FDCA) by using sodium hypochlorite to perform electro-catalysis on 5-hydroxymethylfurfural (5-HMF)

The invention discloses a method for preparing 2, 5-furandicarboxylic acid (FDCA) by using sodium hypochlorite to perform electro-catalysis on 5-hydroxymethylfurfural (5-HMF). The method is characterized by comprising the following steps: evenly mixing the 5-HMF, the sodium hypochlorite and an alkaline solution at the room temperature to obtain a mixed solution, and mixing the mixed solution intoan anode electrolytic cell; adding an alkaline solution into a cathode electrolytic cell, wherein the volume of the added alkaline solution is equal to that of the mixed solution, and the molar concentration of the added alkaline solution is equal to that of solute of the alkaline solution in the mixed solution; taking an anode material as an anode electrode, and carrying out a reaction for 1-12hunder the condition that the potential is 1.0-2.0V so as to obtain the FDCA. The method first uses the sodium hypochlorite and electrolyzed effective chlorine component thereof as an oxidizing agent,takes cheap metals and metal compounds as the anode electrode, replaces the traditional precious metal-based electrode material catalyst with an oxidation reaction catalyst, and replaces the traditional high temperature and high pressure thermal catalytic reaction with a mild electrooxidation reaction at room temperature and atmospheric pressure, so that the cost is greatly lowered, the reaction process is simplified, the energy is saved, the conversion rate of the 5-HMF is further increased, the yield and selectivity of the FDCA are approached, and the industrial production of the FDCA is promoted.
Owner:TIANJIN POLYTECHNIC UNIV

Tri-functionality urethane acrylate based on trimethylolethane/trimethylolpropane and preparation method and application of tri-functionality urethane acrylate

The invention discloses tri-functionality urethane acrylate. A preparation method of tri-functionality urethane acrylate comprises the following steps of firstly, making trimethylolethane or the trimethylolpropane react with ethylene oxide or epoxypropane under the action of a catalyst, so that polyether triols is obtained; then making polyether triols react with 2-isocyanatoethyl acrylate, so that tri-functionality urethane acrylate is obtained. According to tri-functionality urethane acrylate, urethane acrylate is prepared from 2-isocyanatoethyl acrylate, reaction steps are reduced, the reaction process is simple and easy to control, gel is not generated easily due to side reactions, a urethane acrylate product is low in viscosity and can be constructed and applied as a UV formula product more easily, no or little solvent is added when tri-functionality urethane acrylate is used for UV coating, and the requirement of applying tri-functionality urethane acrylate to a low-viscosity coating is met; after low-viscosity tetra-functionality urethane acrylate UV photocuring urethane acrylate is cured, the excellent performance such as high hardness, abrasion resistance, scratch resistance, heat resistance and weather resistance is achieved, and tri-functionality urethane acrylate can be applied as a raw material of the UV coating, printing ink and adhesive.
Owner:JIANGSU LITIAN TECH

2-functionality-degree makrolon urethane acrylate and preparation method and application thereof

The invention discloses low-viscosity 2-functionality-degree makrolon urethane acrylate and a preparation method and application thereof. The preparation method of low-viscosity 2-functionality-degree makrolonurethane acrylate comprises the following step that polycarbonate diol and isocyanatoethyl prop-2-enoate react to obtain 2-functionality-degree makrolon urethane acrylate. The invention further discloses application of 2-functionality-degree makrolon urethane acrylate to preparation of a UV coating or ink or an adhesive. Makrolon urethane acrylate is prepared from isocyanatoethyl prop-2-enoate, the reaction process is simple and easy to control, gel is not prone to be generated through side reactions, the product viscosity is low, construction and application of UV formula products are benefited, and when 2-functionality-degree makrolon urethane acrylate is used for UV spraying, no solvent or few solvent is added, and the requirement for 2-functionality-degree makrolon urethane acrylate used for the low-viscosity coating is met. After 2-functionality-degree UV photocuring makrolon urethane acrylate is cured, excellent mechanical performance, hydrolysis resistance, thermal stability, weather fastness, durability, drug resistance and solvent resistance are achieved, and 2-functionality-degree makrolon urethane can be used as a raw material of the UV coating, the ink and the adhesive.
Owner:JIANGSU LITIAN TECH

Method for selective synthesis of p-xylene from 4-methyl-3-cyclohexene-1-carbaldehyde

The invention relates to a method for selective preparation of p-xylene from 4-methyl-3-cyclohexene-1-carbaldehyde. Specifically speaking, the method comprises the following steps: dehydrogenation and aromatization as well as in-situ hydrogenation and deoxidation reactions of 4-methyl-3-cyclohexene-1-carbaldehyde are carried out in the effects of a tungsten-based catalyst at 250-450 DEG C, and p-xylene is prepared. The method can be carried out in a fixed bed reactor, a fluidized bed reactor or a moving-bed reactor separately, and reaction raw materials are directly injected into a reactor by an injection pump, or the reaction raw materials pass a catalyst bed layer with purging of carrier gas in order to obtain p-xylene. The process has the advantages of simple reaction process, and high selectivity of target product; the substrates can be obtained by Diels-Alder reaction from isoprene and acrolein which are derived from biomass resources and are used as raw materials, and mole yield of p-xylene reaches 90%. Compared with the prior art, the method has the advantages of cheap raw materials and wide sources, economy of reaction carbon atoms, and the like; the tungsten-based catalyst is cheap, and a new route for preparing p-xylene from biomass is provided.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Hyperbranched polymer modified graphene oxide in water phase and method for preparing hyperbranched polymer modified graphene oxide

The invention relates to hyperbranched polymer modified graphene oxide in water phase and a method for preparing the hyperbranched polymer modified graphene oxide, and belongs to the technical field of modification of graphene materials. The method includes ultrasonically dispersing graphene oxide, then adding diamine monomers into the dispersed graphene oxide, and stirring the diamine monomers and the graphene oxide at the constant temperatures to carry out sufficient reaction on the diamine monomers and the graphene oxide; adding diene monomers into reaction systems, and continuing to stir the diene monomers and the reaction systems to polymerize the diene monomers and the diamine monomers; removing hyperbranched polymers by means of dialysis to obtain the modified graphene oxide. Partsof the monomers can be polymerized on graphene oxide lamellas in an in-situ manner when the diene monomers and the diamine monomers are polymerized, so that the graphene oxide can be modified. The hyperbranched polymer modified graphene oxide and the method have the advantages that the technological method is simple and is easy to control, operation conditions for the method are mild, and other added components or multi-step reaction can be omitted; the hyperbranched polymer modified graphene oxide prepared by the aid of the method and composite materials with the hyperbranched polymer modified graphene oxide can be applied to the fields such as preparation of novel separation membranes, novel medicine loading materials and novel adsorption materials.
Owner:BEIJING UNIV OF TECH

Tetra-functionality urethane acrylate based on pentaerythritol and preparation method and application tetra-functionality urethane acrylate

The invention discloses tetra-functionality urethane acrylate based on pentaerythritol and a preparation method and application of tetra-functionality urethane acrylate. The preparation method of low-viscosity tetra-functionality urethane acrylate comprises the steps of firstly, making pentaerythritol react with ethylene oxide or epoxypropane under the action of a catalyst, so that tetra-hydroxy polyether is obtained; then making tetra-hydroxy polyether react with 2-isocyanatoethyl acrylate, so that tetra-functionality urethane acrylate is obtained. The invention further discloses application of low-viscosity tetra-functionality urethane acrylate to preparation of UV coating or printing ink or adhesive. According to tetra-functionality urethane acrylate and the preparation method and application thereof, in the process that urethane acrylate is prepared from 2-isocyanatoethyl acrylate, the reaction process is simple and easy to control, gel is not generated easily due to side reactions, a urethane acrylate product is low in viscosity, the requirement of applying tetra-functionality urethane acrylate to low-viscosity coating is met, and no or little solvent is added when tetra-functionality urethane acrylate is used for UV spray-coating; after low-viscosity tetra-functionality urethane acrylate UV photocuring urethane acrylate is cured, the excellent performance such as high hardness, abrasion resistance, scratch resistance, heat resistance and weather resistance is achieved, and tetra-functionality urethane acrylate can be applied as a raw material of the UV coating, printing ink and adhesive.
Owner:JIANGSU LITIAN TECH

Layered high-entropy double-boron carbide ceramic powder and preparation method thereof

The invention relates to the technical field of high-entropy ceramic materials, in particular to layered high-entropy double-boron carbide ceramic powder and a preparation method thereof. The chemical formula of layered high-entropy double-boron carbide in the layered high-entropy double-boron carbide ceramic powder is REB2C2, wherein RE is at least three different elements selected from Y, Ce, Gd, Dy and Er, and the molar ratio of each of the elements is 1. The preparation method comprises the following steps: ball-milling and mixing at least three metal oxides, a boron source and a carbon source, compacting the uniformly mixed powder to obtain a densified green body, sintering the green body at high temperature to obtain a layered high-entropy double-boron carbide block material, and finally, carrying out crushing and grinding to obtain the layered high-entropy double-boron carbide powder. The single-phase high-entropy double-boron carbide ceramic powder with uniform components can be synthesized by taking the metal oxides as raw materials and adopting a carbon/boron thermal reduction method; and the method is simple in preparation process, easy to control the reaction process, free of impurity introduction, low in product preparation cost and suitable for batch production.
Owner:SHANDONG UNIV
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