33results about How to "Good selectivity" patented technology

The invention relates to the use of reduced fluency rate PDT to treat neovasculature, particularly choroidal neovasculature (CNV). Reduced fluency rate PDT decreases the likelihood of molecular oxygen being the limiting factor in the photodynamic reaction so that the concentration of either photons (light intensity) or photosensitizer in the target tissue controls the photodynamic reaction.

The invention relates to a burning and explosion accident sensing and risk predicting early-warning intelligent fire fighting helmet implementing method. A fire fighting helmet, a long-distance combustible gas detector, a thermal imaging camera module, a head-mounted near-eye display module, a positioning instrument, a data communication and transmission module, an embedded core board, an earphone, a base station, and a fire fighting command centre are involved. According to the burning and explosion accident sensing and risk predicting early-warning intelligent fire fighting helmet implementing method, the real-time position of a fireman in a building can be displayed for the fireman by combining a fireman positioning technology, a building information model and real scene thermal image information, and projecting and displaying information through the head-mounted near-eye display module, so that the environment burning and explosion dangerousness and risk thereof are predicted in real time. When the fireman enters an unknown environmental place, a potential fire disaster explosion accident risk can be effectively predicted quickly; quick sensing and information communication ofthe fireman to a fire disaster accident scene can be realized through an advanced video and thermal imaging technology and an indoor positioning and communication transmission technology, so that thefire fighting rescuing scientific level and the capacity of the fireman are improved.

A membrane and method for separating carbon dioxide from a mixture of gases, where the membrane includes expanded polytetrafluoroethylene and polysiloxane. The membrane is highly stable and can separate carbon dioxide at high flux in harsh environments and high temperatures, such as exhaust gases from power plants.

The catalyst of this invention is capable of enhancing light olefin, e.g., propylene, yields in fluidizable catalytic cracking (FCC) processes. The catalyst comprises (a) pentasil zeolite, (b) at least 5% by weight phosphorus (P2O5) based on particles containing the pentasil, and at least about 1% by weight iron oxide, as measured by Fe2O3, outside of the pentasil zeolite's framework. The catalyst is fluidizable and has an average particle size in the range of about 20 to about 200 microns. The catalyst composition can further comprise additional zeolite suitable for cracking hydrocarbons in a FCC process. The catalyst has been shown to be highly active compared to other catalysts and shows a high selectivity for propylene produced in an FCC process.

A process for continuous phosgene-free preparation of cycloaliphatic diisocyanates.

The present invention discloses high performance polybenzoxazole membranes prepared from aromatic poly(o-hydroxy amide) membranes by thermal cyclization and a method for using these membranes. The polybenzoxazole membranes were prepared by thermal treating aromatic poly(o-hydroxy amide) membranes in a temperature range of 200° to 550° C. under inert atmosphere. The aromatic poly(o-hydroxy amide) membranes used for making the polybenzoxazole membranes were prepared from aromatic poly(o-hydroxy amide) polymers comprising pendent phenolic hydroxyl groups ortho to the amide nitrogen in the polymer backbone. In some embodiments of the invention, the polybenzoxazole membranes may be subjected to an additional crosslinking step to increase the selectivity of the membranes. These polybenzoxazole membranes showed significantly improved permeability for gas separations compared to the precursor aromatic poly(o-hydroxy amide) membranes and are not only suitable for a variety of liquid, gas, and vapor separations, but also can be used in catalysis and fuel cells.

The invention provides a smoke filter composite material as well as a preparation method and application thereof. The smoke filter composite material is a composite material adopting a nano fibrous membrane comprising bottom cloth as a carrier to be loaded with a nitrogen-containing compound. The smoke filter composite material is the composite material by adopting the nano fibrous membrane to load the nitrogen-containing compound, and compared with the existing physical adsorption material or chemical adsorption material, the effect of adsorbing and filtering harmful substances in the smoke can be effectively improved, the selectivity effect for aldehydes substances in cigarette smoke is better, and the harm of the cigarette smoke for the human body can be effectively reduced; and moreover, by virtue of the high specific surface area, ultrahigh surface area and porosity of the nano fibrous membrane, the adsorbent can be better stored, the softness is extremely good, the smoke filter composite material can be added into various filter apparatuses, and the application range is wide.

The present invention provides a gel fuel, which includes a fuel substance held in a polymeric structure. One embodiment of the composition includes neat methanol, to which a thickening substance, such as that sold commercially under the trade name Carbopol®, is added to impart viscosity, as well as stabilizing and suspending properties. In addition to the thickening substance, a further substance can be added to balance the pH of the gel fuel when needed. In accordance with the invention, a fuel cell cartridge is provided that has at least one aspect that is methanol-permeable, and which may include a fuel vapor permeable layer and it may be comprised of one of a number of various alternative materials. Features within the fuel cartridge can be used to increase surface area of the gel fuel, and to maintain the gel fuel in a desired location within the cartridge.

The invention relates to a preparation method and application of a hybrid chemical sensor based on an amphiphilic thermo-sensitive block copolymer and belongs to the technical field of preparation andapplication of chemical materials. The hybrid chemical sensor is formed by two probes P (NIPAM-co-BDMA) and P (NIPAM-co-Rh6GEMa). The preparation method and the application provided by the inventionhave the benefits that a multifunctional polymer fluorescent probe is combined with vision inspection to obtain a multifunctional vision heat sensor; through reasonably designing a detection model, aneigenvalue of color is extracted; a PCA analysis method is constructed, so that the simultaneous quantitative detection on Al<3+> and Fe<3+> is realized.

The invention relates to an active carbon loaded Ru-Co nanocatalyst and its application in a selective hydrogenation reaction of a benzaldehyde compound. The Ru-Co nanocatalyst is characterized in that a metallic ruthenium compound and a metallic cobalt compound undergo coprecipitation on an active carbon carrier and then reduction is carried out under a hydrogen atmosphere so as to obtain the Ru-Co nanocatalyst, wherein mass ratio of ruthenium to cobalt to active carbon in the prepared active carbon loaded Ru-Co nanocatalyst is 1: (10-100): (50-500). According to the selective benzaldehyde compound hydrogenation reaction catalyzed by the Ru-Co nanocatalyst, the benzaldehyde compound is converted to obtain corresponding benzyl alcohol. A preparation method of the catalyst is simple; raw materials are cheap and easily available; and the Ru-Co nanocatalyst is suitable for industrial production. In addition, the catalyst shows good activity and selectivity for the hydrogenation reaction of the benzaldehyde compound, and the catalyst is easy to recycle and reuse.

The invention discloses a method for preparing a multi-level-structured molecular sieve by taking a mesoporous material as an indirect template agent. The method comprises the following steps: mixing aluminum oxide spheres or silicon oxide microspheres, an external silicon source or an aluminum source, phosphoric acid, a template agent and water to form a crystallization raw solution; transferring the uniformly mixed crystallization raw solution into a hydrothermal kettle taking tetrafluoroethylene as a lining, and ageing; after ageing, putting the hydrothermal kettle into a homogeneous reactor for crystallization; cooling a crystallized solution, taking out the crystallized solution and carrying out washing and centrifuging treatment; filtering an obtained solid-liquid mixture, washing and drying; and roasting to remove the template agent to obtain the multi-level-structured molecular sieve. The molecular sieve comprises mesopores and micropores; generation and diffusion of isobutylene in pore channels can be inhibited very well; isomeric hydrocarbon and aromatic hydrocarbon, which have relatively great molecules, can be subjected to more serious diffusion limitation; and meanwhile, the diffusion resistance of a target product, low-carbon olefin, particularly propylene, is reduced due to the presence of the mesopores, so that the prepared multi-level-structured molecular sieve is used as a catalyst, is not easy to inactivate and has good stability.

The invention relates to a polyacid complex. The chemical formula of the polyacid complex is [Ni(HL)2]2H2[P2Mo5O23].2H2O, wherein HL is 2-acetylpyrazine thiosemicarbazone. The polyacid complex belongsto the monoclinic crystal system, and has a C2 / c space group, and cell parameters are as follows: a = 3.0575(7) nm, b = 1.3276(3) nm, c = 1.7009(4) nm, alpha = 90 DEG, beta = 113.837 (5) DEG, and gamma = 90 DEG. The invention also provides a nanocomposite material containing the polyacid complex. The polyacid complex POMs with a good adsorption function is combined with magnetic Fe3O4 nanoparticles to form the magnetic nanocomposite material. The combination of the POMs and Fe3O4 nanoparticles makes the material have an increased adsorption efficiency and well achieve recycling under the action of an external magnetic field.

The invention discloses a method for preparing a supported molecular sieve catalyst by using a vacuum impregnation method. A molecular sieve of a multi-stage pore structure is prepared by adopting a common MCM-41 or SBA-15 molecular sieve of a mesoporous structure as a core and SAPO-34 as a shell, and then the vacuum impregnation method is adopted to load metal nanoparticles; a molecular sieve carrier is firstly degassed before impregnation, and after air in the pore structure is removed, the carrier can be combined with a metal solution more tightly, so that dispersity of the metal nanoparticles on the carrier is improved, reduction of metal ion agglomeration in the reaction process is facilitated, the carbon deposition resistance of the molecular sieve catalyst is improved, the life of the molecular sieve catalyst is prolonged, and the problems of low target-product propylene selectivity and easy carbon-depositing inactivation of a supported molecular sieve catalyst which is preparedby using conventional microporous molecular sieves and the vacuum impregnation method are solved; the supported molecular sieve catalyst is also suitable for other conversion reactions.

The invention provides a method for detecting iron content in a water sample by using a methyl-hydroxamic acid spectrophotometric method. The method comprises the following steps of 1) Fe standard solution preparation; 2) absorbance measurement, wherein 1.5-2.5 milliliters of methyl-hydroxamic acid solution with concentration of 0.207 mole per liter, 1 milliliter of 1+1hydrochloric acid, 5.0 milliliters of a buffer solution with a pH value of 1.5-2.5 and 3.0-5.0 milliliters of 3% of H202 are respectively added into a plurality of Fe standard solutions with different volume amounts and then shaken well, constant volume of 25 milliliters is carried out with distilled water, 1 centimeter of cuvette is adopted, the absorbance is measured by taking reagent blank as reference at the position ofa maximum absorption wavelength; 3) standard curve drawing, wherein the iron content serves as the abscissa, the corresponding absorbance serves as the ordinate, the standard curve is drawn, and a regression equation of the standard curve is calculated; and 4) to-be-measured Fe solution measurement, wherein the absorbance of a to-be-measured Fe<3+> solution is measured, and the iron content of theto-be-measured Fe solution is obtained according to the absorbance. The method for detecting the iron content in the water sample by using the methyl-hydroxamic acid spectrophotometric method has theadvantages that the chromogenic reaction and application of the methyl-hydroxamic acid and iron are studied, the method is applied to the measurement of the iron in the water sample, the recovery rate is 95.5-97.8%, the selectivity is good, and the operation is simple and convenient.

The present invention relates to a process for preparing 1,2-propanediol, in which a glycerol-containing stream, especially a stream obtained on the industrial scale in the production of biodiesel, is subjected to a hydrogenation in an at least three-stage reactor cascade.

A polymer-carbon nanotube composite film is provided for use as a sensor for detecting chemical vapors. The composite film is formed by coating perpendicularly-aligned carbon nanotubes with a polymer selected from poly(vinyl acetate), poly(isoprene), or blends thereof. The sensor may be formed by attaching at least two electrodes to the polymer-carbon nanotube composite film. The sensor may be used in any applications where the sensor is capable of detecting a change in conductivity in the composite.

The invention discloses a functionalized titanium dioxide / chlorella nano composite material based on graphene quantum dots. The composite material is formed by compounding titanium dioxide nano-crystalline grains, functionalized graphene quantum dots, carbonized chlorella and gold nano-particles; and the composite material is in a film shape, and protrusions formed by the carbonized chlorella andthe titanium dioxide nano-crystalline grains are arranged on the surface of the composite material. According to the functionalized titanium dioxide / chlorella nano composite material based on the graphene quantum dots provided by the invention, the graphene quantum dot functionalized titanium dioxide / chlorella is used as the basis for preparing a film sensing material for the first time, comparedwith traditional materials, the film sensing material has excellent sensitivity and selectivity, and when the film sensing material is used as the material for preparing a gas sensitive sensor, the development requirements of miniaturization and integration can be realized in the future application.

The invention is an improved method of making a carbon molecular sieve (CMS) membrane in which a precursor polymer is pyrolyzed to form a carbon molecular sieve membrane that is then exposed to a conditioning atmosphere comprised of a target permeate gas molecule such as ethylene when the membrane is desired to separate it from a light hydrocarbon gas stream. The exposure to the ethylene desirably occurs prior to the CMS permeance and selectivity combination substantially changing (e.g., within 5 days) of cooling from the pyrolyzing temperature. The CMS membranes have shown an improved combination of selectivity and permeance as well as stability and are useful to separate gases in gas streams such methane from natural gas, oxygen from air and ethylene or propylene from light hydrocarbon streams.

The present invention provides a system and method for producing high-purity vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to fluidized gas phase hydrolyzation and fluidized calcination, thereby producing a high-purity vanadium pentoxide product and a by-product of hydrochloric acid solution. The system and method have advantages of favorable adaptability to raw material, no discharge of contaminated wastewater, low energy consumption in production, low operation cost, stable product quality, etc.

The invention discloses an efficient synthesis method of 2-nitroglycal, and belongs to the technical field of synthesis of sugar. The structure of the 2-nitroglycal is shown in the specification. Secondly, the invention also provides a preparation method of the 2-nitro saccharide alkene, and the preparation method provided by the invention can be used for efficiently preparing the 2-nitroglycal through one-step synthesis.

Disclosed is a surface plasmon resonance sensor chip, comprising a glass substrate layer, a gold film layer and a probe molecule layer. The gold film layer is disposed on the glass substrate layer and the probe molecule layer is disposed on the gold film layer. Also disclosed is a method for preparing the surface plasmon resonance sensor chip. By means of a surface plasmon resonance spectrum generated by the surface of the gold film disposed on the glass substrate, the content of lipopolysaccharide in an aqueous solution is detected in a fast, simple, quantitative and ultra-sensitive way.

An economical one-step process is provided for the preparation of epoxides by oxidation of olefins in a homogeneous gas phase reaction, wherein the olefin is reacted in a flow reactor with a gas mixture of ozone and NO2 and / or NO as oxidants without use of a catalyst, and wherein ozone and NO2 and / or NO are mixed in a mixing chamber connected upstream to the flow reactor. The process is characterized in that the olefin in the reaction zone of the flow reactor is reacted at a reaction temperature of approximately 150° C. to approximately 450° C. and a pressure of 250 mbar to 10 bar with the gas mixture of the oxidant, that the carrier gas flow containing the olefin is heated in a preheating zone of the flow reactor to a temperature of 250° C. to 650° C., and that the gas mixture of the oxidant from the mixing chamber, having ambient temperature, is turbulently mixed with the olefin in the reaction zone of the flow reactor, so that the reaction temperature is reached during the mixing and the ratio of olefin-gas flow and gas flow of the oxidant is 5:1 to 1:1.

The invention provides activated carbon for preparing a catalyst for calcium carbide process vinyl chloride and a preparation method of the activated carbon. The activated carbon is nitrogen-containing activated carbon, and the nitrogen content of the activated carbon is 0.1-10%. The preparation method of the activated carbon comprises the following steps of: the selecting of the activated carbon,the pickling of the activated carbon and the dipping of theactivated carbon. The prepared activated carbon is high in adsorption capacity and low in impurity content; when the activated carbon is used for preparing a calcium carbide process vinyl chloride catalyst, the adsorption capacity of the catalyst to non-polar molecules such as acetylene and hydrogen chloride is effectively enhanced, no adverse effect is caused to the stability and catalytic efficiency of the catalyst, and the catalyst is good in stability; the resistance of the catalyst to temperature, poison, mechanical force, chemical erosion, coking, dirt accumulation and the like in a reaction process is high; the initial conversion rate of acetylene is greater than 99.0%; the selectivity of vinyl chloride is greater than 99.5%.

The invention relates to a collophanite reverse flotation collecting agent and a preparation method of the collophanite reverse flotation collecting agent. According to the preparation method, (1), a main raw material is stearic acid with the content being greater than 90%, wherein the steatic acid accounts for 60-95% of a mixture; (2), mixed alcohol serves as a secondary raw material and accounts for 5-40% of the mixture; (3), the mixture and 30% of caustic soda liquid are mixed and react for one hour in a reaction still with the constant temperature being 110 DEG C, and then the reverse flotation collecting agent is obtained. By means of the collophanite reverse flotation collecting agent and the preparation method of the collophanite reverse flotation collecting agent, the collecting performance and the selectivity of collophanite reverse flotation operation can be improved greatly, and under the condition that the quality of concentrates is close, the yield of concentrates is improved by more than 3.2%, and the recovery rate is improved by more than 4.8%. The liquidity and dispersibility of the collophanite reverse flotation collecting agent are improved greatly under the normal temperature of 15-30 DEG C, and transportation, storage, attenuation, adding and the like are facilitated.

The present invention provides compounds of formula (I): compositions comprising such compounds; the use of such compounds in therapy (for example in the treatment or prevention of a disease, disorder or condition ameliorated by inhibition of a dopamine transporter); and methods of treating patients with such compounds; wherein R1, R2, R3, R4, R9a, R9b, R9c, R9d, R9e, R9f, m, n, A, L and B are as defined herein.

The invention relates to the technical field of hydrogenation preparation of gamma-valerolactone through levulinic acid, and discloses a nuclear-shell-type catalyst, a synthesis method thereof, and amethod for preparing gamma-valerolactone through catalyzing of levulinic acid by the nuclear-shell-type catalyst. According to the prepared nuclear-shell-type catalyst M@mSiO2, the core is metal, a shell is of a mesoporous SiO2 structure, and the catalyst can catalyze the levulinic acid to conduct hydrogenation preparation to obtain the gamma-valerolactone. The nuclear-shell-type catalyst M@mSiO2synthetized through the method catalyzes the evulinic acid to prepare the gamma-valerolactone, and the high catalyst stability, catalytic activity and reusability are achieved.

It is one object to devise a solution which is suitable for a wet treatment of Hafnium containing high-k materials. Furthermore, it is an object to devise a use of this solution in the field of semiconductor device manufacturing. It is also an objective of the invention to devise a process to this aim.

Methods of forming dispersoid hardened metallic materials are provided. In an exemplary embodiment, a method of producing dispersoid hardened metallic materials includes forming a starting composition with a base metal component and a dispersoid forming component. The starting composition includes the base metal component in an amount from about 50 to about 99.999 weight percent and the dispersoid forming component in an amount from about 0.001 to about 1 weight percent, based on the total weight of the starting composition. A starting powder is formed from the starting composition, and the starting powder is fluidized with a fluidizing gas for a period of time sufficient to oxidize the dispersoid forming component to form the dispersoid hardened metallic material. The dispersoid forming component is oxidized while the starting powder is a solid.

A transition metal complex having 2,2′-bis[bis(3,5-di-tert-butyl-4-methoxyphenyl)phosphino]-1,1′-binaphthyl as a ligand. The presence of the transition metal complex in the reaction system of an asymmetric reaction system allows the preparation of an objective compound having an objective absolute configuration with improved efficiency.