29 results about "High selectivity" patented technology

The invention discloses a phenol ortho-methylation catalyst and a preparation method thereof. The catalyst is an alkaline Fe/Mg compound oxide, wherein, the mol ratio of Fe to Mg is 1: (0.1-2). The preparation method comprises the following steps: mixing and dissolving soluble malysite and soluble magnesium salts into alcohols solvent according to a required proportion to prepare a solution A; adding polyethyleneglycol (PEG) into strong aqua ammonia to prepare a solution B; slowly mixing the solution A and the solution B in a cocurrent flow mode under the condition of normal temperature and ultrasound, and then going on with the ultrasound for 30 minutes; filtering, washing, drying and baking the obtained precipitation; porphyrizing the baked solid and repulverizing the solid into 10-20 mesh finely ground particles after tabletting; the finely ground particles are the catalyst. The catalyst has the advantages of high activity at low temperature, simple preparation, innocuity, good stability, high selectivity of ortho position, particularly high selectivity of orthocresol and few by-products.

The invention relates to a novel separation membrane with high performance and a preparation method thereof. The membrane is prepared from high-flux directionally-arranged carbon nanotubes serving as a substrate, and a ZIF (Zeolitic Imidazolate Framework) type metal-organic framework material with high selectivity serving as a separation layer. The preparation method comprises the following steps: (1) preparing a directionally-arranged carbon nanotube substrate on a microfiltration membrane through a vacuum filtration method; (2) growing a ZIF type metal-organic framework material surface layer on the carbon nanotube substrate through an interface method. In conjunction with high transmission properties of inner channels and tube gaps of carbon nanotube material tubes and the three-dimensional micro-pore structure of the ZIF type metal-organic framework material, the prepared novel metal-organic framework material separation membrane based on the carbon nanotube substrate has high permeability and high selectivity in a membrane separation process. The novel separation membrane shows superior separating performance in a nano-filtration process, and a basis is laid for the design and preparation of a large-flow efficient separation membrane.

A manufacture method for a trumpet-shaped contact includes the following steps of: forming a first insulating layer on a silicon underlay which is formed with an active structure, an isolation and a metal silicide; then forming a second insulating layer; forming a photosensitive resist and forming a contact hole pattern of the photosensitive resist by photoetching and developing; etching the second insulating layer and the first insulating layer to form a contact hole; returning the photosensitive resist; carrying out the etching adopting a gas with high selectivity ratio of the second insulating layer/the first insulating layer on the second insulating layer and the first insulating layer to form a trumpet-shaped contact hole; removing the photosensitive resist; filling and contacting metals as well as flatting; forming a dielectric medium layer between metals and etching a metal wire pattern; filling a first metal and flatting; continuing other manufacture processes. The trumpet-shaped contact manufactured by the method can prevent the dispersing of copper.

The invention discloses a method for synthesizing 2, 3-dichloropyridine (III). The method comprises that 1) pyridine (I) as a main starting raw material and chlorine undergo a full reaction in water or vapor as a reaction medium in the presence of a chlorination inducer to produce a pyridine chloride (II) as the next reaction raw material, and 2) the pyridine chloride (II) as a reaction raw material contacts with hydrogen and undergoes a catalytic hydrogenation reduction reaction in water or vapor as a reaction medium in the presence of an acid-binding agent and a catalyst to produce 2, 3-dichloropyridine (III) having purity of 99% or more, wherein the catalyst is a nanometer IrO2-ZnO-MnO2 composite catalyst. The reaction equation is shown in the description and n is 2-5. The method has the advantages of high reaction conversion rate, high selectivity, stable product quality, simple processes and low cost and solves the problem that the existing synthesis method produces 2, 3-dichloropyridine (III) having unstable quality and satisfying the quality standards after multiple rectification processes.

The invention relates to a catalyst for preparing acrylic acid by oxidation of acrylic aldehyde, a preparation method of the catalyst, and a synthesis method of acrylic acid, and is used for mainly solving the problem of not high selectivity of an acrylic acid catalyst in the prior art. The technical problem is better solved through adopting the technical scheme that the acrylic acid catalyst contains an active component represented by the following general formula of Mo12VaCubXcYdZeKfOj, wherein X is at least one selected from W, Cr and Sn, Y is at least one selected from Fe, Bi, Co, Ni, Sb, Zr and Sr, and Z is at least one selected from lanthanide elements. The acrylic acid catalyst can be used in industrial production of acrylic aldehyde oxidation production of acrylic acid.

The invention provides a chemical-mechanical polishing composition comprising (a) abrasive particles, b) a removal rate inhibitor selected from (I) a surfactant comprising a polyoxyalkylene functional group and a sulfonate functional group, (II) a surfactant comprising a polyoxyalkylene functional group and a sulfate functional group, (III) a first surfactant comprising a polyoxyalkylene functional group and a second surfactant comprising a sulfonate functional group, and (IV) a first surfactant comprising a polyoxyalkylene functional group and a second surfactant comprising a sulfate functional group, and (c) an aqueous carrier. The invention also provides a method of chemically-mechanically polishing a substrate comprising TiN and SiN with the inventive chemical-mechanical polishing composition.

The invention relates to the field of preparation of pillared layered saponite-containing catalyst carrier by using saponite, and in particular, provides a catalyst carrier and a preparation method and an application thereof. The method comprises the steps: (1) grinding a first slurry containing hydrogen type pillared layered saponite, mixing the first slurry after grinding with an alumina source, and dispersing evenly to obtain a second slurry; and (2) mixing the second slurry with an adhesive, and molding to obtain the catalyst carrier. The invention also provides a hydroisomerizing cracking catalyst and an application thereof. According to the preparation method of the catalyst carrier, the first slurry containing the hydrogen type pillared layered saponite is ground, the first slurry after grinding is mixed with the alumina source, and then the mixture is dispersed evenly to obtain the second slurry, so that the finally obtained catalyst carrier has the advantages of increase of the number of effective acidic sites of an acidic component and more uniform dispersion of the acidic components; the catalyst prepared by the carrier has the advantages of high activity, high selectivity of a target product and the like.

The invention discloses a high-selectivity aggregation induced chemiluminiscence probe for <1>O2 as well as a preparation method and an application of the chemiluminiscence probe. The structural formula of the chemiluminiscence probe is shown in the description, and the chemical name is 6-(4-(1,2,2-triphenylethyl)phenyl)-2,3-dihydrophthalazine-1,4-dione (TPE-PH for short). Chemiluminiscence of theprobe is weak when a solution is formed by the probe in a good solvent such as tetrahydrofuran. In a tetrahydrofuran-water mixed solvent, when proportion of water is larger than 70% (V/V), chemiluminiscence produced when formed nano-aggregate is oxidized by <1>O2 is enhanced sharply with increase of the proportion of water in the mixed solvent, the probe has typical aggregation induced reinforcedchemiluminiscence characteristic, and emission wavelength peak is 485 nm. The TPE-PH nano-aggregate has quite high chemiluminiscence selectivity for <1>O2 under physiological conditions and can recognize <1>O2 on nanomole level, which proves that TPE-PH is a novel chemiluminiscence probe capable of recognizing and detecting <1>O2 with high selectivity and high sensitivity in a physiological system.

The invention provides a high-selectivity protection method of hydroxyl. The method comprises the following steps of: dissolving an organic compound containing two or more hydroxys into proper aprotic solvents; adding an acylation reagent which has the molar weight equal to that of the hydroxy requiring protection; adding anionic salt which is of catalytic amount and is low in price and easy to gain; and reacting for sufficient time at proper temperature, thus protecting one or two hydroxys in a two-hydroxy or multi-hydroxy compound along with high selectivity. The high-selectivity protection method of the hydroxyl has the characteristics of being environment-friendly, mid in reaction condition, simple and convenient in operation and high in yield, and the adopted agents are green, environment-friendly, low in price, easy to gain, high in efficiency, etc.

The invention relates to an imidazolamide ligand and a nickel complex thereof as well as application of the nickel complex to polyisoprene synthesis and belongs to the field of novel compounds and organic synthesis. The complex is used in the polyisoprene synthesis, and a polyisoprene synthesis method comprises the following the steps: dissolving a co-catalyst, the imidazolimide nickel complex and an isoprene monomer in a solvent, stirring at a temperature of 25 DEG C under the condition of argon gas protection for reaction for 2-4 hours, separating and purifying to obtain a polyisoprene product. The polyisoprene synthesis method provided by the invention is efficient and environmentally-friendly and has high selectivity.

The invention discloses an amide hydrodeoxygenation method, which is characterized in that under the catalytic action of a multi-component metal oxide catalyst, amide and hydrogen are subjected to a hydrodeoxygenation reaction to generate a corresponding amine compound, and the multi-component metal oxide catalyst is prepared by a coprecipitation method. The active components comprise copper oxide, zinc oxide, molybdenum trioxide, magnesium oxide and aluminum oxide in a mass percentage ratio of (25-40): (10-20): (1-5): (5-15): (20-50). The method has the advantages of simple reaction process, high reaction conversion rate, high selectivity and simple catalyst preparation process, and can be used for industrial production.

The invention discloses a recombinant saccharomyces cerevisiae strain for secretory expression of hyaluronidase of capitella teleta, and belongs to the technical field of gene engineering. A hyaluronidase gene from capitella teleta is in cloned connection to a saccharomyces cerevisiae integration expression vector pRS305 by adopting a recombinant DNA technology; plasmid pGAP(m)-sp23-6xGln-HAase isobtained by means of replacing a promoter, adding a signal peptide and adding amino acid oligopeptide and the like to the N end of the gene; the saccharomyces cerevisiae host S.cerevisiae CEN.PK2-1Cis transformed to construct the recombinant strain for high yielding hyaluronidase which is named as S.cerevisiae CEN.PK2-1C-pGAP(m)-sp23-6xGln-HAase. In a 3L tank, the vitality of hyaluronidase for extracellularly expressing the recombinant S.cerevisiae strain can be 1.26*10<6>U/mL, and is increased by 5.1 times intracellular vitality, which is 2.05*10<5>U/mL, of recombinant strain S.cerevisiae pRS305-HAase. The hyaluronidase obtained by fermenting the saccharomyces cerevisiae serving as host has high selectivity and high vitality for hyaluronic acid, and has an important application prospect.

The invention discloses a method for synthesizing a cyclooctatrieneindole derivative through manganese catalysis. The method takes cheap and commercial Mn(CO)5Br as a catalyst, and C-H bond activation, allene reaction and intramolecular 1,5-hydrogen migration cascaded reaction of a propargyl alcohol carbonate type compound and 3-alkenyl substituted-N-pyridylindole type compound are realized; undermoderate conditions, a cyclooctatrieneindole type framework can be constructed in a high-yield and high-selectivity manner. The method is simple to operate, low in catalyst dosage, moderate in reaction conditions and wide in substrate applicable range; the disadvantages that traditional synthesis of the compound needs to be carried out through a plurality of steps, a starting raw material is difficult to prepare, the substrate applicable range is limited and the like are overcome and the method has a very good development prospect.

The invention belongs to the technical field of detection of tetravalent cerium ions, and particularly discloses a chemiluminescence method for detecting tetravalent cerium ions in a solution. The method is provided based on the catalytic property of tetravalent cerium ions on a chemiluminescent substrate CDP-star, and is specifically characterized in that CDP-star is added into a solution to be detected to form a detection system, when tetravalent cerium ions exist in the solution to be detected, the tetravalent cerium ions can catalyze the CDP-star to hydrolyze to generate a chemiluminescent signal, and the tetravalent cerium ions in the solution to be detected are detected and analyzed by measuring the chemiluminescence signal of the detection system. The tetravalent cerium ion detection method disclosed by the invention can be carried out under a neutral pH condition, and has the advantages of simplicity in operation, mild conditions, high sensitivity, good selectivity and the like.

The invention relates to the technical field of olefin polymerization reaction catalysis. The invention specifically discloses an application of a mono-cyclopentadienyl fourth subgroup metal complex containing a neutral coordination side group. The structure of the mono-cyclopentadienyl fourth subgroup metal complex containing the neutral coordination side group is represented by a formula 1 or aformula 2, the mono-cyclopentadienyl fourth subgroup metal complex containing the neutral coordination side group is used as a main catalyst, a mixture of alkylaluminoxane or alkylaluminum and an organic boron auxiliary agent is used as a cocatalyst, and the mono-cyclopentadienyl fourth subgroup metal complex containing the neutral coordination side group is used for catalyzing olefin polymerization reaction, so that 1-hexene or alpha-olefin with the carbon number of more than or equal to C10 can be generated with high selectivity.

The invention relates to the field of heat absorption film production, in particular to a preparation method of a nano black chromium high-selectivity heat absorption film layer. According to the nanoblack chromium high-selectivity heat absorption film layer, a light-absorbing material is fully dispersed in an isopropanol solution, and then the heat absorption film layer is prepared by adopting acoating processing mode, so that the nano black chromium high-selectivity heat absorption film layer has the advantages of simple preparation process, low cost and low equipment cost. According to the invention, organic modified nano chromium sesquioxide powder is adopted, so that the dispersing performance is more excellent, and better and fully fusion with other components is realized. The coalescing agent aimed at an isopropanol solvent system has excellent film forming performance, uniformity and completeness of a film layer are guaranteed, and the heat absorption film layer prepared by the method has excellent corrosion resistance and high-selectivity light absorption capacity, is an excellent-quality heat absorption film layer and has high market value.

The invention discloses a polyethylene glycol modified licochalcone A preparation method, wherein licochalcone A is subjected to polyethylene glycol modification due to the advantages of good water solubility and good biocompatibility of polyethylene glycol so as to improve the water solubility of licochalcone A and expand the use range and the use effect. According to the present invention, monocarboxy-terminated polyethylene glycol is prepared by using polyethylene glycol and maleic anhydride as main raw materials through a ring-opening reaction, and the monocarboxy-terminated polyethylene glycol and licochalcone A are subjected to an esterification reaction under a catalyst condition to obtain the target product polyethylene glycol modified licochalcone A, wherein the obtained product can be widely used in medicine, cosmetics and other industries, and has potential market prospects; and the preparation method has advantages of high selectivity, simple operation, easy availability ofraw materials, mild conditions and the like.