36results about How to "Short reaction temperature" patented technology

The invention belongs to the field of metal materials and relates to a method for preparing metal Ti by using hydrogen to induce Mg to restore TiO2, which is characterized in that industrial TiO2 powder and industrial Mg powder are adopted as raw materials and are mixed uniformly to be pressed into blocks, mixtures of TiH2 and MgO are obtained through reduction reaction in a certain hydrogen pressure range and a certain temperature range, and metal Ti powder is obtained after vacuum hydrogen releasing processing and pickling drying of the mixtures. Compared with the existing other preparing processes of metal Ti, the method is simple in process, low in cost, short in reaction time and free of environment pollution. The preparing process of the method has wide prospect in industrialized production of Ti and other alloy.

The invention relates to a method for preparing terpinyl acetate, comprising: terpilenol and acetic anhydride are respectively added into a reaction kettle to be stirred, the mixture is added with phosphoric acid to be evenly stirred and then added with SnCl4.5H2O at the room temperature until the SnCl4.5H2O is completely dissolved, and the reaction is carried out under agitation while the temperature gradually raises; the reaction liquid is cooled to be room temperature and added with Na2CO3 to neutralize H3PO4 and SnCl4, and is directly distilled after being neutralized by carbonic acid, so that most acetic acid is evaporated; reaction product is washed by 10% of NaOH solution and saturated saline solution to remove the residual acetic acid until neutrality and then processed by fractionation, so that the terpinyl acetate is obtained. The method has the advantages of providing a novel composite catalyst system and a new technique for synthesizing the terpinyl acetate, being low in cost and simple in post treatment and having higher catalytic activity and reaction selectivity. The method also can ensure the yield of terpinyl acetate, shorten the reaction time, reduce the wastewater in the production and improve the recovery rate of acetic acid byproduct and the concentration of acetic acid.

The invention discloses a method for synthesizing carbon-coated lithium ferrous pyrophosphate by a hydrothermal method. The method comprises the following steps of (1) weighing raw materials, dissolving a carbon source into distilled water or deionized water, and heating, stirring and dissolving in a water bath at the temperature of 50-90 DEG C; respectively dissolving a lithium source, an iron source and a phosphorus source into the deionized water, uniformly stirring the sources, sequentially adding the iron source and the lithium source into a solution dissolved with the carbon source, adding ammonia water to adjust the pH of the mixed solution to 4-6, adding the phosphorus source, heating the mixed solution in the water bath at the temperature of 50-90 DEG C, and stirring for 1-2 hours; (2) performing reaction on the mixed solution at 150-350 DEG C and the pressure of 1-10MPa for 3-10 hours, cooling to room temperature after the reaction is finished, and performing solid-liquid separation to obtain a solid which is a precursor solid-phase product; (3) drying the precursor solid-phase product, and then sintering to obtain the carbon-coated lithium ferrous pyrophosphate. The method has the advantage that the reaction temperature is relatively low, and the synthesis method is simple; the prepared carbon-coated lithium ferrous pyrophosphate serving as a positive electrode material is excellent in electrochemical performance.

The invention discloses a carbon-coated SnSe / r-GO@ C compound with a sandwich-like structure and a preparation method and application thereof. The carbon-coated SnSe / r-GOcompound with the sandwich-like structure is prepared with from ethylene glycol or glycerin serving as a solvent, inorganic tin salt servingas a tin source, a reducing agent and a surface active agent through a simple solvothermal method, wherein the reducing agent not only can reduce selenium powder and provide Se < 2->, but also can reduceoxygen-containing functional groups on the graphene oxide, so that the conductivity of the graphene in the composite material is further improved; and the added reducing agent can be effectively complexed with Sn < 2 + >, the size of the product is controlled, and the nanocrystallization material is more effective for improving the electrochemical performance. The preparation method is simple and high in repeatability, the conductivity of the SnSe-based composite material is improved after the graphene oxide is added and a hydrothermal reaction is carried out, the structural stability of the composite material is further improved by coating a layer of pyrolytic carbon, and the composite material has good electrochemical performance as a sodium ion electrode material.

The invention relates to a new method for osmium powder purification. A direct distillation method with hydrochloric acid and sodium hypochlorite is adopted, and mixtures of osmium and osmium oxides based on osmium elementary substance are obtained; and then osmium powder with the purity of 99.5% and above is obtained through hydrogen reduction. According to the new method, the oxidation distillation with the sodium hypochlorite and the hydrochloric acid is adopted directly, and new dissolution reagents and the new method are applied; the working procedure of alkali fusion is omitted, and thetechnological process is shortened; the production cost is reduced; distillation residues are neutral, and can be discharged directly; the method is low in reaction temperature and less in impurity inclusions, and the product quality is guaranteed. The new method has the advantages of a short technological process, relatively less scattered wastes, and high dissolving efficiency and direct recovery rate of the osmium.

The invention discloses a method for synthesizing carbon-coated lithium ferrous pyrophosphate by a hydrothermal method. The method comprises the following steps of (1) weighing raw materials, dissolving a carbon source into distilled water or deionized water, and heating, stirring and dissolving in a water bath at the temperature of 50-90 DEG C; respectively dissolving a lithium source, an iron source and a phosphorus source into the deionized water, uniformly stirring the sources, sequentially adding the iron source and the lithium source into a solution dissolved with the carbon source, adding ammonia water to adjust the pH of the mixed solution to 4-6, adding the phosphorus source, heating the mixed solution in the water bath at the temperature of 50-90 DEG C, and stirring for 1-2 hours; (2) performing reaction on the mixed solution at 150-350 DEG C and the pressure of 1-10MPa for 3-10 hours, cooling to room temperature after the reaction is finished, and performing solid-liquid separation to obtain a solid which is a precursor solid-phase product; (3) drying the precursor solid-phase product, and then sintering to obtain the carbon-coated lithium ferrous pyrophosphate. The method has the advantage that the reaction temperature is relatively low, and the synthesis method is simple; the prepared carbon-coated lithium ferrous pyrophosphate serving as a positive electrode material is excellent in electrochemical performance.

The invention discloses modified Ca-Co-O system doped composite oxide of transition metals and the preparing method thereof, and relates to thermoelectric material and the preparing method thereof. The invention solves the problems of high reaction temperature, long reaction time and easy impurity production of the prior Ca-Co-O system preparing method. The general formula of the composite oxide is Ca3Co2-xMxO6 or Ca3-x-yMxNyCo4O9+Delta, wherein, M refers to Fe, Ni, Nd or Er, and N refers to Na or Bi. The method contains the following procedures: firstly, dissolving materials into deionized water according to the respective stoichiometric ratio of the molecular formula, mixing the water solution of raw materials uniformly, slowly injecting citric acid solution and performing ultrasonic oscillation to produce homogeneous sol; secondly, heating for dehydration with microwave to get wet sol; thirdly, drying the wet sol to get dry sol and allowing self-propagating combustion; fourthly, baking after grinding. Compared with the prior art, the invention has the advantages of short reaction time, low baking temperature and simple operation. The powder of the material of the invention has uniform particle distribution and high purity; the powder has flaky structure and the particle diameter is smaller than 200nm.

The invention discloses a high-efficiency environment-friendly preparation method of 2-hydroxyethylpyridine, which comprises the following steps: proportionally adding 2-methylpyridine and formaldehyde into a high-pressure autoclave, adding a solid superhigh acid catalyst, heating while stirring to react, quickly cooling the high-pressure autoclave, filtering out the solid superhigh acid catalyst, distilling the mixed solution under reduced pressure, and distilling off unreacted 2-methylpyridine, formaldehyde and water under the pressure of 10-100 mmHg to obtain the 2-hydroxyethylpyridine end product. Abundant experiments are performed to screen out the optimal proportion of the reactant raw material to the catalyst thereof; and abundant experiments are performed to screen out the optimum reaction temperature, reaction time and reaction pressure. The whole method has the advantages of reasonable technique, small environmental pollution, low reaction temperature, short reaction time, high reaction efficiency, low production cost, high yield and high purity of the prepared 2-hydroxyethylpyridine.

The invention discloses a preparation method of an 8-hydroxyquinoline iron organic dye photodegradation catalyst, and belongs to the field of metal-organic complexes. The method comprises the following steps: firstly, preparing a photodegradation catalyst reaction solution, dissolving ligands in N,N-dimethylformamide or methanol, dissolving an iron salt in methanol or N,N-dimethylformamide, mixingthe obtained two solutions, carrying out stirring at room temperature, heating the prepared reaction liquid to 60-80 DEG C for a reaction, slowly carrying out cooling to room temperature after the reaction is finished to obtain a brown black block crystal, then carrying out washing in methanol, and carrying out airing, so as to obtain the 8-hydroxyquinoline catalyst with catalytic activity. Themethod provided by the invention has simple operation, mild condition and low cost, and the efficiency is high when the catalyst is applied to organic dye photodegradation, so that the method providedby the invention has feasibility in industrial application.

The invention belongs to the field of metal materials and relates to a method for preparing metal Ti by using hydrogen to induce Mg to restore TiO2, which is characterized in that industrial TiO2 powder and industrial Mg powder are adopted as raw materials and are mixed uniformly to be pressed into blocks, mixtures of TiH2 and MgO are obtained through reduction reaction in a certain hydrogen pressure range and a certain temperature range, and metal Ti powder is obtained after vacuum hydrogen releasing processing and pickling drying of the mixtures. Compared with the existing other preparing processes of metal Ti, the method is simple in process, low in cost, short in reaction time and free of environment pollution. The preparing process of the method has wide prospect in industrialized production of Ti and other alloy.

This invention discloses an oxidizing and desulfurizing method for fraction oil, which includes that a fraction oil raw material and hydrogen peroxide are reacted in a high effective mass transfer reactor with intensified onflow internal components, such as an impact flow reactor, the reactants in it can be mixed fully in short time and the reaction efficiency is increased obviously since the effective collision among molecules arises quick reaction and the reaction condition is more relax than ordinary beat up reactors when the same desulfurized result is got.

The invention discloses a preparation method of resin carbon for blood purification. The preparation method comprises the following steps: preparing chloromethylated styrene-divinylbenzene microspheres from p-chloromethyl styrene monomers and divinylbenzene monomers; preparing polystyrene-divinylbenzene microspheres from the chloromethylated styrene-divinylbenzene microspheres; dipping the polystyrene-divinylbenzene microspheres by using a zinc-chloride solution to obtain dipped microspheres; and carbonizing the dipped microspheres, and activating the dipped microspheres after the carbonizing so as to obtain a finished product. The preparation method disclosed by the invention has the obvious effects that the resin carbon with the excellent absorbing effect for middle molecules can be prepared and obtained at relatively low temperature and within shorter time, the preparation process is simple, the pollution is slight, the product yield is high and the purity is high.

The invention discloses yarn ball-like zinc oxide microspheres and a preparation method thereof. The grain size of the microspheres is 2-9mu m, the microspheres consist of zinc oxide thin sheets, and a part of the microspheres have a large hole in the center. The preparation method comprises the following steps: dissolving zinc salt in water to prepare a solution, then, adding hexamethylenetetramine, stirring at room temperature till the solution is clarified, and then adding tartaric acid and uniformly stirring to obtain a reaction solution; and transferring the solution to a reaction kettle, reacting at 120-180 DEG C to prepare zinc oxide; after reaction, carrying out centrifugal separation and washing to obtain the zinc oxide microspheres. The preparation method of the zinc oxide microspheres disclosed by the invention has the advantages that the needed materials are cheap, the preparation process is simple and convenient to operate, the reaction temperature is low and the reaction time is short. The prepared product is regular in shape, has large specific surface area, strong morphologic controllability, good stability and repeatability and strong operability and practicality and has a potential application value and strong practicality in the field of photocatalytic performance, gas sensitivity and the like.

The invention discloses a method for co-producing furaldehyde, cellulose and lignin by depolymerizing biomasses. According to the method, in a mixed solvent of water and acetone, depolymerization andseparation of the biomasses are catalyzed in a one-step manner under the synergistic effect of phosphoric acid and sulfuric acid, the reaction temperature of furaldehyde production is effectively reduced, the reaction time of furaldehyde production is effectively shortened, energy conservation and emission reduction are achieved, the production cost of furaldehyde products is greatly reduced, highyield of the furaldehyde products is achieved, lignin components and cellulose components in biomass raw materials are efficiently separated, the purity of cellulose in residues is high, the cellulose can serve as a commodity or a raw material to be reused, and the method solves the problems that according to an existing furaldehyde production process, reaction steps are more, reaction temperature is high, reaction time is long, yield is low, and components cannot be efficiently separated.

The invention discloses a synthetic method for a diaryl urea compound. The method comprises the following steps: an aniline compound, bis (trichloromethyl)carbonate and a tertiary amine compound, expressed in the formula II, are reacted at the room temperature in a reaction solution, and are tracked and detected by TLC (Thin Layer Chromatography) till the reaction is totally finished; and the diaryl urea compound which is expressed in the formula I can be prepared by aftertreatment of the reaction liquid . The method adopts triphosgene as an acylation reagent, and adopts the tertiary amine compound as a catalyst and acid-binding agent, so that the reaction time is short, the reaction is generally finished within 1-2 hours, the conversion rate of raw materials achieves 100%, the product yield is high above 95%, the aftertreatment is convenient, and the purity is high.

A method for preparing glucosamine hydrochloride is characterized in that the following steps are adopted: 1) chitin is processed by gas explosion expansion method: the chitin raw material is packed in an air explosion expansion tank, and the gas explosion expansion medium is injected into the gas explosion expansion medium. Use one of water vapor, water, ammonia water, and ethanol; instantly release the pressure in the gas explosion expansion tank, and spray the chitin raw material into the normal pressure container to obtain the chitin concentrate; 2) hydrochloric acid hydrolysis; 3 ) decolorization; 4) filtration; 5) concentrated crystallization; 6) secondary crystallization. Compared with the prior art, the present invention has the following advantages: 1) the chitin pretreated by the gas explosion puffing method is used as raw material, which has higher chemical activity and can obtain higher product yield; 2) in the hydrolysis process , almost no "coking" phenomenon; 3) GAH is extracted once in the process, and the preparation of GAH becomes simple; 4) Hydrochloric acid can be recycled to realize clean production of GAH.

The invention provides a lithium ion battery negative material. The lithium ion battery negative material comprises nano silicon particles and carbon material particles, wherein the nano silicon particles are uniformly dispersed among the carbon material particles to form microspheres; and the carbon material particles are carbonized metallic organic skeleton materials. The microsphere structural silicon-carbon composite material is obtained by adopting a micro-emulsion method. Compared with the prior art of embedding nano silicon into each single carbon material particle to form a core-shell structure, a lithium ion battery manufactured with the negative material has higher electrochemical cycling performance and multiplying power performance; and meanwhile, the preparation method is simple and easy, and is low in reaction temperature, short in preparation time, good in controllability and favorable for mass production. An experiment shows that the primary discharge specific capacity of the prepared lithium ion battery at the multiplying power of 0.1C is 1800 to 2069 mAh / g, and after the lithium ion battery is circulated for 120 times, the discharge specific capacity is 1000 to 1280 mAh / g.