108results about How to "Be selective" patented technology

The invention discloses a method for preparing epoxy chloropropane with the oxidation of chloropropene. The chloropropene, a solvent and fine particles of titanium silicate molecular sieve catalyst are put into a reaction pot and a hydrogen dioxide solution is added at 10 DEG C to 80 DEG C. The method is characterized in that a reaction is carried out under a subacidity condition and after the reaction, materials pass through an intermediate tank for oil-water dissociation to be divided into oil phase and water phase; the oil phase is sent into a rectifying tower for separating the chloropropene and ECH. After the water phase is filtered, a catalyst filter cake is washed by the solvent, regenerated or applied to an epoxidation reaction after being directly beat with the solvent. The ECH is extracted from an aqueous layer after filtration by the chloropropene. An extracted oil layer and an oil layer obtained from the separation of a reaction solution are combined and rectified, or the extracted oil layer is applied to the epoxidation reaction; water left from the extraction is rectified for recycling methanol and applied to the preparation of catalysts; and the method has simple procedures, small consumption amount of solvents, high separation yield of reaction products and easy realization of industrialization.

A method for fabricating a CMOS integrated circuit (IC) includes providing a substrate having a semiconductor surface, wherein the semiconductor surface has PMOS regions for PMOS devices and NMOS regions for NMOS devices. A gate dielectric layer is formed on the semiconductor surface followed by forming at least a first metal including layer on the gate dielectric layer. A polysilicon or amorphous silicon layer is formed on the first metal including layer to form an intermediate gate electrode stack. A masking pattern is formed on the intermediate gate electrode stack. The polysilicon or amorphous silicon layer is dry etched using the masking pattern to define a patterned intermediate gate electrode stack over the NMOS or PMOS regions, wherein the dry etching stops on a portion of the first metal comprising layer. The masking pattern is removed using a first post etch clean for stripping the masking pattern. A multi-step solution cleaning sequence is used after the removing step and includes a first wet clean including sulfuric acid and a fluoride, and a second wet clean after the first wet clean including a fluoride. Fabrication of the IC is then completed.

A semiconductor device manufacturing method includes a plasma etching process for selectively plasma etching a silicon nitride film against a silicon oxide film formed under the silicon nitride film in a substrate to be processed. The plasma etching process uses an etching gas including a C_mF_n gas (m, n represent integers of 1 or greater) added to a gaseous mixture of a CH_xF_y gas (x, y represent integers of 1 or greater) and O₂ gas, wherein the flow rate of the C_mF_n gas is not greater than 10% of that of the O₂ gas. The etching gas may further include a rare gas.

The present invention relates to a metal surface treating technology, and is to utilize nano technology and nano material to modify traditional powder paint. Specifically, aluminum section bar surface is treated with nano modified powder paint to raise quality and increase special functions. The nano modified powder paint is prepared through the steps of mixing conventional paint material including resin, curing agent, pigment, assistant and stuffing with nano material, smelting, extruding, cooling, pressing, coarse crushing, grinding, sieving etc. The nano modified powder paint is used to treat aluminum shapes through electrostatic painting.

The invention provides a method of detecting the trace polychlorinated biphenyls in atmospheric particulates by ion trap tandem mass spectrometry; the steps of the method comprises sample collection, sample leach, sample concentration and purification and the detection of pilot sample by chromatography-ion trap mass spectrometry; by optimizing the conditional parameters of gas phase chromatography and tandem mass spectrometry, the invention has better selectivity and better sensitivity in the detection of titled compound compared with the conventional detection method; the invention solves the mutual interference between PCBs and multi-chlorine organic compounds in the traditional analysis and detection method by SRM technique of gas phase chromatography/ion trap tandem mass spectrometry (GC/ITMS), and greatly simplifies the fussy steps of purification and separation in sample pretreatment; SRM technique has the advantages of sensitivity, selectivity, low detecting expense and reliable and accurate determination of the nature; therefore, the invention has remarkable advantage compared with the traditional detecting instrument such as GC/ECD,GC/LRMS,GC/HRMS.

The invention provides a dendritic branched molecular modified separation membrane and a preparation method thereof, a composite separation membrane and application of the dendritic branched molecularmodified separation membrane and composite separation membrane, and relates to the technical field of fluid separation. The dendritic branched molecular modified separation membrane comprises separation membranes, wherein modified membranes are formed on the membrane surfaces and/or hole walls of inner holes of the separation membranes, and the modified membranes are mainly prepared from dendritic branched molecules. The provided dendritic branched molecular modified separation membrane has the advantages that the modified membranes mainly composed of the dendritic branched molecules are formed on the membrane surfaces and/or hole walls of inner holes of the separation membranes to effectively regulate the surface structures and/or inner structures of the separation membranes, be conductive to maximizing the balance between the permeability and the selectivity, and increase the permeation flux.

The present invention relates to a process for producing organic carboxylic acid amides by nitrile hydrolysis of a nitrile compound at certain temperature and pressure in the presence of a catalyst to produce an organic carboxylic acid amide.

The invention discloses a method for preparing fatty aldehyde by means of a hydroformylation reaction. A catalyst system consisting of a water-soluble rhodium phosphine complex and a diphosphine ligand is used in water/organic two phases for catalyzing 1-butene, 2-butene and a mixture of the 1-butene to be subjected to the hydroformylation reaction so as to prepare n-valeraldehyde; due to the combination of the water-soluble bisphosphine ligand BISBIS and organic additives, the hydroformylation reaction of the butene is accelerated, and the molar ratio of the produced n-valeraldehyde/isovaleraldehyde is greater than 93 to 7. A catalyst aqueous solution is simple and convenient to separate from the product; furthermore, the catalytic performance is stable, the reaction conditions are mild,the service life of a catalyst is long, and the production cost of the n-valeraldehyde is remarkably lowered.

The invention discloses a high-frequency break variable distance protection method of a flexible DC power distribution system. The protection method comprises the following steps of 1, analyzing high-frequency fault characteristic when a bipolar short-circuit fault occurs in a photovoltaic access-containing flexible DC circuit with regard to the photovoltaic access-containing flexible DC circuit,and deriving transient high-frequency impedance of the system during a fault; 2, analyzing distribution characteristic of a voltage high-frequency fault component in the system during short circuit atdifferent positions, thereby obtaining a high-frequency break variable distance protection principle; and 3, analyzing influence of different circuit structures on high-frequency measurement impedance with regard to the problem of difficult in setting and matching of protection in the DC system, and performing protection configuration and setting calculation on the system.

The invention relates to the technology of the radio energy transmission, and specifically relates to an omni-directional selectivity radio energy transmission system. The system comprises a transmitting end connected with a power supply module, and a load module connected with multiple receiving ends; the frequency of the transmitting end is adjustable and is matched with the resonant frequency of each receiving end. The transmission system can satisfy the energy supply to multiple receiving ends at any location of the space by only needing one transmitting end, and the transmission system has the selectivity function at the same time, the energy is only supplied to the receiving end needing the energy in the specific time slot, the energy utilization efficiency is improved, and the loadservice life is prolonged.

Disclosed is a method for preparing a granulated inorganic adsorbent for radionuclides including slurry forming, solidification, drying and hardening, granulation, and washing steps: blending a dihydrogen phosphate, a powdered inorganic adsorbent raw material and a setting time regulator in water to form a slurry; adding sintered magnesia into the slurry, and blending the mixture to form a solidified slurry; setting the solidified slurry on a disk member, and naturally drying to hardening in a specific temperature range to form a hardened solid material; smashing the hardened solid material and performing vibration sieving by using a screen to obtain a granulated inorganic adsorbent for radionuclides containing residual reagents; washing the granulated inorganic adsorbent for radionuclides containing residual reagents with water, to remove the residual reagents to complete preparation, where the adsorption capacity of the granulated inorganic adsorbent for radionuclides thus prepared is in the range of 0.7 to 1.9 meq/g.

The Direct Synthesis of trialkoxysilane is carried out by conducting the Direct Synthesis reaction of silicon and alcohol, optionally in solvent, in the presence of a catalytically effective amount of Direct Synthesis catalyst and an effective catalyst-promoting amount of Direct Synthesis catalyst promoter, said promoter being an organic or inorganic compound possessing at least one phosphorus-oxygen bond.

The invention discloses a preparation method for osmanthus chocolate. An aromatic osmanthus plant is added in chocolate, and prepared chocolate has the aroma of the plant. When consumers are enjoying the chocolate, the effects of scented flowers and refreshing are achieved.

The embodiment of the invention provides a plasma thruster steady-state ion flow field measurement device and a measurement method and belongs to the technical field of steady-state ion flow field measurement. The device comprises a measurement module, a power supply module and a probe assembly, the probe assembly comprises a probe, a probe support and an electric rotary table, the probe comprisesan insulation shell, an ion receiving pole, an incident gate and an emergent gate, one end of the insulation shell is open, the incident gate is located at the opening of the insulation shell, the emergent gate is located at the middle part of the inner cavity of the insulation shell, the ion receiving pole is located at one section, far away from the incident gate, in the inner cavity of the insulation shell, an incident hole of the incident gate and an emergent hole of the emergent gate are coaxial, the ion receiving pole, the incident gate and the emergent gate are mutually insulated, theinsulation shell is fixed on the probe support, and the electric rotary table is used for driving the probe support to rotate around the incident hole of the incident gate. The device provided by theembodiment of the invention can obtain an ion current density distribution function on each azimuth angle of a measurement point by enabling the probe to rotate around the measurement point, and a vector angle of an ion velocity is obtained at the same time.

The invention relates to a method and a system for modeling associated information topology analysis in a power distribution network. The method comprises the following steps: 1) obtaining primary equipment information and secondary system information in the power distribution network; 2) according to the primary equipment information, establishing a power grid topology network model, wherein the node elements of the network model comprise a generator, a busbar, a circuit and a transformer, and the branch element of the network model is switch equipment; and 3) according to the secondary system information, combining the primary equipment information to establish an associated information topology network model, wherein the node element of the network model is secondary system logic equipment, and the branch element of the network model is the relation between primary equipment and the secondary system logic equipment. According to the method disclosed by the invention, the complicated system information of the power distribution network can be simplified, fault information is quickly and effectively analyzed according to the associated information topology network, and stable operation of an electric power system is guaranteed.

The invention relates to a prehydrogenation treatment for a carbon-4 alkylation raw material. According to the prehydrogenation treatment method, a palladium-molybdenum series catalyst and a fixed bedreactor are utilized; hydrogenation process conditions are that a reaction temperature is 30 to 75 DEG C, reaction pressure is 1 to 3MPa, a liquid space velocity is 2 to 10h<-1>, and a molar ratio ofhydrogen to butadiene is 1 to 10; the palladium-molybdenum series catalyst is prepared from an aluminum oxide carrier containing nickel with a specific crystal form, so that the catalyst has appropriate acidity and a higher reactive metal utilization rate, and butadiene hydrogenation activity and selectivity of the catalyst are remarkably improved. By means of the hydrogenation treatment method disclosed by the invention, a carbon-4 alkylation raw material pretreatment device can effectively remove impurity butadiene at a higher feeding space velocity under the situation that monoolefine in ahydrogenation product is fundamentally not lost; thus, very obvious and good effects of improving environmental benefits and economic benefits of a follow-up alkylation device are achieved.

The invention discloses a wavelength selective radiator coating applied to a thermophotovoltaic power generation device and a preparation method of the wavelength selective radiator coating. Firstly, erbium oxide powder and aluminum oxide powder are uniformly mixed, then mixed powder is obtained, grinding balls, a ball-milling liquid, the mixed powder and a dispersing agent are added to a ball-milling tank for ball milling, and uniformly dispersed slurry is obtained; the grinding balls in the slurry are filtered out, the ball-milling liquid in the slurry is dried, and dry powder is obtained; the dry powder is put in a high-temperature atmosphere furnace and heated, so that the erbium oxide powder and the aluminum oxide powder in the dry powder are sintered to form composite powder, the grinding balls, a binding agent and a diluent are added to the composite powder, the mixture is subjected to ball milling, the uniformly mixed slurry after ball-milling is dried, and then a die can be used for coating a substrate material; after the coated substrate material is dried and sintered at a high temperature, the wavelength selective radiator coating is formed and obtained. The mechanical performance and the surface strength of the coating are improved, the thermal stability of a coating radiator is improved, and the defect that the coating cannot be bonded to a ceramic substrate easily is overcome.

The invention discloses a method and a device for simultaneously detecting three metabolic products of chlorpyrifos in urine. The method comprises the following steps: (A) target compounds selection: selecting 3,5,6-trichloro-2-pyridoxol, triethyl phosphate and diethyl thiophosphate; (B) sample enzymolysis; (C) sample extraction; (D) sample purification and concentration; (E) instrumental analysis. The device mainly comprises a main body and a chromatography-ion tandem mass spectrum detector, wherein the main body comprises a power supply unit, a thawing unit, a centrifugal device I, a water bath device, a turbine mixing device, a centrifugal device II, a purification device, a rotary evaporation device and a PLC (programmable logic controller). According to the method disclosed by the invention, the detection effectiveness and the detection reliability are greatly improved, and the detection time and the detection cost are saved.

A process for the isomerizing dehydration of a feedstock including a primary monoalcohol, alone or as a mixture, of formula R—CH₂—OH, wherein R is a nonlinear alkyl radical of general formula C_nH_2n+1 where n is an integer between 3 and 20, the process taking place

• • in the gas phase at a weighted average temperature between 275° C. and 400° C., at a pressure between 0.3 MPa and 1 MPa and at a WWH (weight per weight per hour) between 5 and 10 h⁻¹,
  • in the presence of a catalyst containing at least one silicic binder and at least one zeolite having at least one series of channels, the opening of which is defined by a ring of 8 oxygen atoms (8MR),
  • process wherein vaporized feedstock entering the reactor has a weight content of water of from 4% to 35%.

The invention discloses a dam bin surface green cutting device and a construction method thereof. The dam bin surface green cutting device comprises a preparation device and an operation device, wherein the preparation device comprises a high-pressure water pump, an air compression device and a central centralized control center, a water inlet of the high-pressure water pump is connected with a water storage tank, a water outlet of the high-pressure water pump is connected with a high-pressure water outlet pipe, an air outlet of the air compression device is connected with an air sand outlet pipe, and the air sand outlet pipe is simultaneously connected with a sand box for providing sand materials and a small stone box for providing stone materials; and the operation device comprises a high-pressure water gun and an air sand gun which are connected side by side. According to the intermittent time and strength of concrete on the dam bin surface, single or double effects of the high-pressure water gun and the air sand gun are selected to perform green cutting on the concrete on the dam bin surface to achieve the best green cutting effect.

A photographic printing system includes a film reader for reading photographic image of a photographic film, a printer for printing the photographic image on an image recording medium based on photographic image data obtained through the film reader, a writer for writing at least the photographic image data in a loaded optical disc of the WORM (Write Once Read Many) type, and a controller for controlling the writing process of the writer. The controller allows writing, in the optical disc, of both the image data and a display processing program for displaying the image data written in the optical disc on a monitor when the optical disc has no data pre-written therein and allows writing, in the optical disc, of the image data when the optical disc has such display processing program pre-written therein.

The invention relates to the technical field of measurement and test, in particular to a comprehensive testing system. The comprehensive testing system comprises a central processing unit, an acquisition module, a communication module and a user interface. The central processing unit is used for storing and operating information of the acquisition module. The acquisition module is connected with the central processing unit, and the central processing unit receives data acquired by the acquisition module. One end of the communication module is connected with the central processing unit, and the other end of the communication module is connected with a tested system or tested point and monitors central processing unit variables of the tested system or variation states of the tested point. The user interface is connected with the central processing unit and used for receiving and displaying signals of the central processing unit. The central processing unit comprehensively solves the technical problems of measurement and test according to display, storage and operation of the acquired data.

Process for the in-situ regeneration of a zeolite catalyst in a carbonylation process for the production of at least one of methyl acetate and acetic acid. The process is carried out by (a) contacting a carbonylatable reactant selected from methanol, dimethyl ether and dimethyl carbonate and carbon monoxide in a reactor with a zeolite catalyst and recovering a product stream containing at least one of methyl acetate and acetic acid from the reactor, (b) ceasing contact of the catalyst with the carbonylatable reactant, (c) regenerating the catalyst with a regenerating gas selected from hydrogen or a mixture of hydrogen and carbon monoxide at a temperature in the range 250 to 600 C, and (d) terminating the hydrogen regenerating step and resuming contact of the catalyst with the carbonylatable reactant and carbon monoxide.