43results about How to "Low reaction temperature requirement" patented technology

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 relates to a treatment method and an application of antibiotic bacterial residues, and aims to solve problems that existing bacterial residue treatment methods are long in period, still have the environmental risk after treatment and the like. The method comprises steps as follows: 1) fresh bacterial residues are placed in a reaction tank, the moisture content is controlled between 85% and 95%, and the bacterial residues are evenly mixed; 2) the reaction tank containing the bacterial residues is placed in a microwave reactor, heated to 100 DEG C by a microwave generator with the microwave power of 100-900 W and kept for 10 min; 3) the antibiotic bacterial residues after the reaction are subjected to centrifugal separation, and obtained bacterial residues are precipitated and dried. With the adoption of the method, antibiotic residues in the bacterial residues can be removed quickly, and harmless treatment and recovery of the bacterial residues are realized.

The invention provides a preparation technology of hexagonal plate magnesium hydroxide. Magnesium hydroxide products are prepared into slurry mass concentration of which is 7.5 percent to 15 percent, the slurry is added into transforming agent solution to enable the total alkali concentration of the transforming agent solution to be 2-4mol/L; then all the mixture is mixed uniformly and placed in a high-pressure reaction kettle to react at 140-160 DEG C for 2-6h; and after being cooled, the reaction product is washed by water, dried and crashed to obtain the hexagonal plate magnesium hydroxide. The transforming agent is a composite transforming agent formed by mixing lithium hydroxide and sodium hydroxide or potassium hydroxide according to mol ratio of 1:1-1:4. Observed by a low vacuum laser scanning electron microscope, the magnesium hydroxide prepared in the invention is a hexagonal plate magnesium hydroxide with complete crystal formation and uniform granularity; the grain diameter of the magnesium hydroxide is correlative to raw materials; and the specific surface of the magnesium hydroxide is 3.0-20 m<2>/g. Due to the adoption of the new transforming agent, the invention has high transformation ratio, good product quality, stable crystal formation and low cost.

The invention relates to a method for preparing a rare-earth fluorescent up-conversion material by use of waste fluorescent powder. The method comprises the following steps: weighing process waste fluorescent powder, and leaching the fluorescent powder in a sulfuric acid solution to obtain a solution; performing solid-liquid separation, regulating the pH by use of ammonia water, and then performing primary sedimentation, secondary sedimentation, third sedimentation, fourth sedimentation, aging and filtering to obtain filter residue; firing at a high temperature, cooling until the temperature drops to a room temperature, and then adding MOH solution and performing suction filtration to obtain white powder; adding a hydrochloric acid solution, and drying by distillation to obtain the mixture of anhydrous yttrium chloride and anhydrous europium chloride, MOH solid and MHF2 fine powder and RmF3 or RmCl3 solid, and homogenizing; adding a high boiling point solvent, heating and stirring; centrifuging, performing centrifugal washing on the obtained solid powder by use of normal hexane or acetone, drying and then washing by use of boiling water a plurality of times and drying, thereby obtaining the rare-earth fluorescent up-conversion material. The method for preparing the rare-earth fluorescent up-conversion material by use of the waste fluorescent powder has the advantage and the characteristic that green high-value recycling comprehensive utilization of rare earth elements in rare-earth trichromatic phosphor waste can be realized.

The invention discloses a comprehensive utilization method of a ferriferous fayalite material, relates to a processing method of the ferriferous fayalite material, and in particular relates to a method for separating and utilizing iron and silicon in fayalite. The method is characterized by comprising the following steps of: grinding the ferriferous fayalite material; mixing with alkaline liquor for leaching reaction; performing solid-liquid separation on obtained reaction slurry to obtain desilicated concentrate and silicon containing alkaline liquor; and oxidizing the desilicated concentrate in air to goethite. The method disclosed by the invention enriches, separates and extracts iron and silicon elements to form two products: goethite and silicon containing alkaline liquor through alkaline liquor leaching, wherein iron and silicon in ferriferous fayalite exist in solid and liquid states, so that the comprehensive utilization ratio of resources is high and the economic benefit is better.

The invention relates to a preparation method for metallic element-doped graphene quantum dots, specifically to a hydro-thermal preparation method for silver-doped graphene quantum dots, belonging tothe technical field of nano-materials. The hydro-thermal preparation method for the silver-doped graphene quantum dots is characterized in that sugar and silver acetate produce the water-soluble metalsilver-doped graphene quantum dots under hydrothermal reaction conditions. According to the invention, metal silver ions are introduced into graphene quantum dots, and the energy level structure of the graphene quantum dots is adjusted so as to all the graphene quantum dots to have more excellent photoelectric performance. The preparation method is simple in process, low in cost for raw materials, simple in equipment and beneficial for large-scale production of enterprises; and the prepared quantum dots have good water-solubility, substantial fluorescence properties, and important applicationvalue in fields like photocatalysis, photoelectrons, solar cells and chemical sensing.

The invention discloses a method for treating antibiotic fungi residues by percarbonate to prepare an organic fertilizer, relates to a treating method and recycling for antibiotic fungi residues and aims at solving the problems that existing antibiotic fungi residue treatment cost is high, has environmental risk after treatment and the like. The method disclosed by the invention comprises the steps of adding percarbonate into antibiotic fungi residue liquid, putting in a reaction tank, heating to 60 to 80 DEG C, performing thermal-insulation reaction and centrifuging to collect precipitate toprepare the organic fertilizer, wherein the molar ratio of antibiotic to percarbonate is 1 to (300 to 500). By means of the method disclosed by the invention antibiotic residues can be degraded in high efficiency, and antibiotic drug resistance bacteria contained in the fungi residues are inactivated; furthermore, a pH need not be adjusted after treatment, and method procedures are simple. The method disclosed by the invention has the advantages of relatively moderate harmless treatment condition, lower reaction temperature requirement, ability in preventing protein denaturation, high safety,high efficiency and low cost. The fungi residue organic fertilizer does not contain the antibiotic drug resistance bacteria, cannot generate bacterium drug resistance in soil and has high use safety.

The invention discloses a method for preparing methanthiol. The method comprises the following steps: loading potassium tungstate into a carrier-Al2O3 in a conventional impregnation method; adding zinc chloride solution into the carrier to ensure that the quality content of the zinc chloride in the whole catalyst is 2-20 percent; impregnating and drying the mixture to reach a constant weight and roast for 1-6 hours; feeding hydrogen sulfide and liquid methanol according to a molar ratio of 1 to 10 in a mixed mode; pre-heating and vaporizing the mixed material at 260-300 DEG C; introducing the material into a reactor to fully contact the catalyst to react under the pressure of 0.5-1.0MPa at the regulation reaction temperature of 320-390 DEG C for 2-4 hours to obtain mixed gas; and performing separation treatment on the mixed gas to obtain a garget product of methanthiol. By adopting the method, the methanol conversion ratio is improved while the high selectivity of the methanthiol is maintained at the same time, the reaction condition is mild, and the production cost is reduced.

The invention provides poly-substituted 3-phenyl phenol derivatives and a preparation method thereof. Compared with the prior art, a series of novel poly-substituted 3-phenyl phenol derivatives is provided. Compared with common poly-substituted 3-phenyl phenol derivatives, the prepared poly-substituted 3-phenyl phenol derivatives have a multi-ring structure, the structure is more complicated, and thus the provided derivatives have a wide application in industries such as chemical engineering, clinical medicine, materials, and the like. Furthermore, the provided preparation method has the advantages of simpleness, high efficiency, and short reaction time.

The invention provides an activated carbon type exhaust gas denitration device of a ship. The device comprises a waste gas turbocharger 2, a smoke three-way valve 3, a PM removing device 4, a smoke cooler 5, an NO oxygenizer 5, a reactor 9, an activated carbon conveying control unit 23 and a temperature control unit 16. Compared with an existing ship denitration device, the device is simple in system composition; activated carbon is used as an adsorbent and a reducing agent; the activated carbon is high in adsorbing capacity and reducing capacity, so that the size of the reactor of a denitration system is far less than the size of a reactor of an existing urea based ship SCR (Selective Catalytic Reduction) denitration system; and the existing ship SCR denitration system basically adopts NH3, prepared through a urea water solution, as the reducing agent, the urea water solution easily forms urea crystals on the surfaces of a mixer and a catalyst to cause the reduction of working performances of the denitration system, while for the device, the consumed material is only the activated carbon, so that the advantages are obvious.

The present invention discloses preparation process of p-bromofluoro benzene. Liquid fluoro benzene and elementary substance bromine as reactants are made to produce bromination in the presence of catalyst to produce p-bromofluoro benzene and hydrogen bromide. The preparation process features that chlorine gas is introduced into the reaction system for oxidation reaction with hydrogen bromide to produce oxide of hydrogen chloride and hydrogen bromide, and the oxide of hydrogen bromide further reacts with fluoro benzene to produce p-bromofluoro benzene. After the bromination, the product is used as final product or post-treated to eliminate at least one of produced hydrogen chloride, p-chlorofluoro benzene and m-bromofluoro benzene for raised purity of p-bromofluoro benzene product. The process has the advantages of low liquid bromine consumption and low cost.

The invention relates to a method for preparing a bimetallic carbide composite material. The method comprises the steps of dripping a hetero-tungstic acid solution Na10[Co4(H2O)2(PW9O34)2] 27H2O intoan organic amine solution during stirring, continuing stirring for 1 hour after dripping, performing centrifuging, conducting washing with deionized water, performing drying to obtain precursor solidpowder, and calcining the precursor solid powder to obtain the bimetallic carbide composite material. According to the method for preparing the bimetallic carbide for efficient electrolyzation of water for hydrogen evolution, prepared bimetallic carbide nanoparticles are uniform in size and high in dispersibility, wherein the molar ratio of Co6W6C is controlled within a range from 50% to 60%, andthe nanoparticles are coated with carbon in the thickness of 3-5 nm so that a corrosion effect of an electrolyte on a catalyst in a hydrogen evolution process can be effectively prevented. The methodhas the advantages of simple preparation process, convenient operation, lower requirement for reaction temperature and high efficiency and achieves a broad application prospect in the aspect of industrial application.

The invention relates to a preparing and purifying method for O-substituted hydroxylamine fluorescence derivatization reagents. Tetra-n-butylammonium bromide and potassium hydroxide are adopted as catalysts. The method includes reacting carbazole and alpha,omega-dihaloalkane to obtain an intermediate I that is 9-(omega-chloroalkyl)-9H-carbazole or 9-(omega-bromoalkyl)-9H-carbazole, reacting the intermediate I with N-hydroxy-5-norbornene-2,3-dicarboximide in dimethylformamide under catalysis of potassium carbonate to obtain an intermediate II that is (3aR,4R,7S,7aS)-2-((9H-carbazole-9-yl)alkoxy)-3a,4,7,7a-tetrahydro-1H-4,7-methanoisoindole-1,3(2H)-dione, purifying the intermediate II through column chromatography, reacting the intermediate II with hydrazine hydrate to obtain a target product that is O-(omega-(9H-carbazole-9-yl)alkyl) hydroxylamine. The purifying method includes suspending the target product into water, adjusting the mixture to be acidic, extracting with an organic solvent to remove impurities, adjusting a water layer to be alkaline, extracting with an organic solvent, and recovering the organic solvent until the product is dry. The prepared product can be used for pre-column derivatization-liquid chromatography measurement of aldehydes or fluorescence labeling of aldehyde group containing compounds.

The invention relates to the technical field of functional materials, in particular to a method for preparing potassium-containing hydroxyapatite powder. The method for preparing the potassium-containing hydroxyapatite powder includes the steps that a certain amount of Ca(NO3)2 and a certain amount of H3PO4 are weighed in the molar ratio of 3:2, the Ca(NO3)2 and the H3PO4 are dissolved into 300 mL of distilled water respectively, then two solutions are mixed, stirred for a period, drawn, filtered, centrifuged and dried, and Ca3(PO4)2 powder is prepared; the powder is put into a corundum crucible and calcined for 2 h at the high temperature of about 1,300 DEG C, then the product is taken out of a furnace immediately and cooled to be at the room temperature, and the alpha-Ca3(PO4)2 powder is obtained; a KOH solution is prepared, then the alpha-Ca3(PO4)2 powder is put into the KOH solution respectively, a beaker opening is sealed with a preservative film, a bearer is put into a drying oven, the temperature is set as 120 DEG C, the product is taken out of the drying oven after 3 days, drawn, filtered, repeatedly washed and dried, and the potassium-containing hydroxyapatite powder is obtained. According to the experiment, as the chemical precipitation method is adopted, the requirement of the reaction temperature is low, the purity of the synthetic product is high, particles are fine, the operating process is simple, the synthetic cost is low, and industrial production is facilitated.