5839results about How to "Less impurities" patented technology

Disclosed is a cellulose nonwoven fabric containing cellulose fibers having a maximum fiber diameter of not more than 1500 nm and a crystallinity determined by solid state NMR techniques of not less than 60%. The porosity of the cellulose nonwoven fabric is not less than 40% and not more than 99%.

To control the precipitation position of a crystal and increase the yield of the crystal by performing the crystal growth according to the solvothermal method while allowing a predetermined amount of a substance differing in the critical density from the solvent to be present in the reaction vessel; and to prevent mixing of an impurity into the crystal and improve the crystal purity.

The present invention relates to a process for the production of an elemental material, comprising the step of reacting a halide of the elemental material with a reducing agent in solid form in a fluidized bed reactor at a reaction temperature which is below the melting temperature of the reducing agent. In a preferred embodiment of the present invention, the elemental material is titanium and the titanium is produced in powder form. The invention also relates to the production of alloys or intermetallics of the elemental materials.

The present disclosure provides alternative nucleosides, nucleotides, and nucleic acids, and methods of using them. In some aspects, the disclosure provides mRNA wherein the uracil content has been modified and which may be particularly effective for use in therapeutic compositions, because they may benefit from both high expression levels and limited induction of the innate immune response. In some aspects, the disclosure provides methods for the production of pharmaceutical compositions including mRNA without reverse phase chromatography.

The invention relates to a method for preparing a length-diameter-ratio nano-silver wire by a pH-value regulation solvothermal method. The method comprises the following steps of: preparing the following ethylene glycol solution, namely an ethylene glycol solution A of silver nitrate or silver acetate, an ethylene glycol solution B of polyvinyl pyrrolidone (PVP), an ethylene glycol solution C of water-soluble chloride and concentrated acid D; mixing the components according to a certain amount and fully stirring to form a final mixed solution; moving the final mixed solution into a reaction kettle; placing in an oven for reaction for a certain time; taking the reaction kettle out and cooling to room temperature to obtain mother liquid of the nano-silver wire; adding alcohol into the mother liquid for diluting, and removing supernatant liquor to obtain a precipitate; and repeatedly performing centrifugal separation, and thus obtaining nano-silver wire dispersion liquid uniformly dispersed in the alcohol. The method is simple, high in efficiency and low in cost, and can prepare high-quality nano-silver wires within a wider range of reaction condition; and prepared products are high in length-diameter ratio, good in length uniformity and low in impurity content.

A silicon oxide film is deposited by rotating a rotation table on which a wafer W is placed to allow BTBAS gas to be adsorbed on an upper surface of the wafer W and supply a O₃ gas to the upper surface of the wafer W for allowing the BTBAS gas adsorbed on the upper surface of the wafer W to react. After depositing the silicon oxide film, a reforming process is performed every deposition cycle by supplying a plasma of Ar gas to the silicon oxide film on the wafer from an activated gas injector.

The invention relates to a preparation method of a walnut peptide powder, which effectively embodies a plurality of biological functional properties of the walnut peptide powder, reserves a plurality of nutritional components of walnuts. The polypeptide content in the walnut peptide powder is 60-80 percent, while the walnut peptide powder is light yellow or yellow-white color and has functions of anti-fatigue and antioxidation, etc. The invention comprises the following operation steps: crushing the walnut cakes before extracting the walnut protein, then carrying out enzymatic hydrolysis and centrifugation to the crude walnut protein to acquire the supernatant, dialyzing the supernatant and removing impurities and macromolecular compounds, and then concentrating the acquired dialysate, and at last vacuum drying to prepare the walnut peptide powder and packing into finished products.

This invention relates to a method for the production of graphene oxide and its use in various applications. The invention provides a method for the preparation of graphene oxide which involves treating a mixture of graphene oxide and impurities with a solution of a base. The impurities in the graphene oxide include oxygen-containing species that are associated with it i.e. bound to the graphene oxide but which are not covalently bonded to the graphene. The graphene oxide of the present invention has improved purity relative to the poorly characterised graphene oxide that is produced by existing methods.

The problem regarding volatileness of a solvent in an EL forming material, which occurs in adopting printing, are solved. An EL layer is formed in a pixel portion of a light emitting device by printing. Upon formation of the EL layer, a printing chamber is pressurized to reach a pressure equal to or higher than the atmospheric pressure, and the printing chamber is filled with inert gas or set to a solvent atmosphere. Thus the difficulty in forming an EL layer by printing is eliminated.

The invention relates to a method for controlling and optimizing the distillation tower. It controls the distillation tower in dependence on the material balance relation and component balance relation, optimizes the distillation tower by using representative model. Employing the abstraction proportion between the light product on the top of the tower and heavy product in the bottom of the tower (in following, taking the proportion between light and heavy product for abbreviation) as main controlled variable depending on the distillation principle, the material balance and component balance in the distillation tower, controlling the proportion between the light and heavy product, temperature, reflux ratio to realize stable operation by regulating the quantity of reflux and heat load of re-boiler. Simulating the practical course through the technological process simulation software, and training the nerve net model to become the representative model for the course optimization. Optimizing the operation with the representative model by using the analytical data for the raw material and product to realize the product Ka bian optimization, increasing the productivity of product with high value on the condition of guaranteeing the product quality and realizing the device energy saving and consumption reduction.

This invention relates to carbonylation of methanol, methyl acetate, dimethyl ether or mixtures thereof to produce glacial acetic acid, and more specifically to the manufacture of glacial acetic acid by the reaction of methanol, methyl acetate dimethyl ether or mixtures thereof with carbon monoxide wherein the product glacial acetic acid contains low formic acid impurities.

The invention relates to a high Cu-RE refining agent which has high efficiency and low burning loss rate and can be used for copper and copper alloy, applied to mass refining of the copper and the copper alloy, especially applied to refining and modification of red impure copper and white impure copper. The Cu-RE interalloy refining agent is prepared by a vacuum melting method, wherein, rare earth content is up to 30-65%; and only 2-6g/kg refining agent is added while the Cu-RE interalloy refining agent is applied to remelting refining of scrap copper. The Cu-RE refining agent enhances slagging and deslagging of copper fused mass, reduces deleterious substances in the fused mass of the scrap copper, and improves texture and performance of the copper and the copper alloy, therefore, products prepared from the red impure copper as a raw material reach or exceed the quality of the products prepared from electrolytic copper as a raw material, and the white copper process waste can be used for directly producing high-quality products after remelting refined, thus promoting recycle and reutilization of the scrap copper, saving energy and resource, reducing environmental pollution and generating significant economic and social benefits.

A fractionation process for producing value-added products from a lignocellulosic biomass, comprises: a) mechanically refining the lignocellulosic biomass under mild refining conditions to form a refined biomass pulp with enhanced susceptibility to separation of hemicellulose, cellulose and lignin, and enhanced digestibility of carbohydrates in hydrolysis b) separating hemicellulose and sulfur-free high-quality lignin from cellulose in the refined biomass, and, optionally c) producing various bioproducts from the above said process.

An atomizer and an electronic cigarette comprising the same are provided. The atomizer comprises an atomization sleeve and an atomizer assembly contained in the atomization sleeve, a first filter and a second filter separated from each other are provided successively on one end of the atomizer assembly that is close to the smoking end; the first filter is breathable and is configured to prevent tobacco tar in smoke from exhausting, and the second filter is configured to discharge the smoke filtrated by the first filter; the second filter is made from breathable porous material; and is capable of deforming elastically when subjected to an external force. The first filter filtrates the tobacco tar for the first time; the suction nozzle is replaced by the second filter which may deform elastically; besides, the second filter may not be contaminated by the tobacco tar impurity adsorbed by the first filter.

The invention relates to a radix acanthopanacis senticosl composition, a preparation containing the composition and a content detection method of the preparation. The composition per gram contains 50-120mg of total flavones, 12.5-30mg of syringin and 4-15mg of eleutheroside E. The composition and preparation provided by the invention have effects on lowering blood sugar level, lowering blood lipid and treating male sterility and have better effects than the prior art.

The invention discloses a shielding longitudinal watertight degaussing cable and a production method thereof for ships. A tinned copper wire is impregnated with a sealant and then twisted into a twisted copper conductor which is impregnated with a conductor sealant layer on the periphery, an electro-insulating rubber layer is extruded on the periphery of the conductor sealant layer to form insulation core wires, chloroprene rubber filling bars are filled into gaps between the insulation core wires, and a plurality of insulation core wires are twisted wholly into a cable core. A cable core inner sealant layer, an inner jacket rubber layer, an armor shielding layer and an outer jacket rubber layer are sequentially arranged on the periphery of the cable core. A single wire of the cable conductor is impregnated with the sealant, the twisted copper conductor is impregnated with the conductor sealant layer on the periphery, the cable core inner sealant layer is extruded on the periphery of the cable core to form multiple sealing, the chloroprene rubber filling bars swell during follow-up vulcanization and can fill in the gaps inside the cable core completely, and tangency between the insulation core wires can be avoided, so that the sealant can permeate to the inside of the cable core to guarantee the watertight effect when the cable core inner sealant layer is extruded.

The present invention relates to a cathode material of Lithium-Nickel-Cobalt-Aluminum composite oxide, a method of fabricating the same, and a lithium ion battery including the same. The composite cathode material has a core-shell structure, wherein the core portion is made of LiNi_1-x-yCo_xAl_yO₂ which is washed with an alcohol and organic acid-mixed solution, wherein 0<x≦0.2, 0<y≦0.1; the shell is metal oxide layer. In the present invention, the composite cathode material is fabricated by a combined method, wherein the base material is washed with an alcohol and organic acid-mixed solution and the shell layer material is coated by spray drying. The composite cathode material of the present invention has low content of lithium impurities and excellent high-temperature cycling and storage performance.

A novel nodular silica sol adapted to use as a polishing material for polishing, for instance, CMP.

The nodular silica sol has a ratio of an average particle diameter (r) measured by the dynamic light scattering method versus a particle diameter (r′) converted to that of an equivalent sphere computed from an average specific surface area measured by means of the nitrogen absorption method (r/r′, referred to as “association ratio”) in a range from 1.2 to 10, the particle diameter (r′) in a range from 5 to 200 nm, and the specific surface area in a range from 13 to 550 m²/g. The nodular silica particles have heterogeneous forms, and contents of Ca and Mg contained in the nodular silica particles are below 1000 ppm against SiO₂ respectively.

The invention relates to a nano-material mixed modified superhigh-temperature high-performance well cementing slurry system and a preparation method thereof. The slurry system comprises the followingingredients in parts by weight: 100 parts of oil well cement, 15-25 parts of coarse silica sand, 15-20 parts of fine silica sand, 1-10 parts of nano-silicon dioxide, 1-10 parts of nano-calcium carbonate, 0.2-1 part of a defoaming agent, 4-10 parts of a fluid loss agent, 0-3 parts of a drag reduction agent, 0.5-4 parts of a retarder and 30-100 parts of water. In the slurry system, set cement has excellent compressive strength and toughness under superhigh temperature, and the compressive strength and the elasticity modulus cannot be obviously changed as the maintenance time is prolonged. The slurry system has good rheological property, lower water loss and proper thickening time, and the comprehensive properties of the slurry system can completely meet the related requirements of site wellcementing construction, so that the technical support is provided for well cementing under high temperature. A nano-material obtained by mixing the nano-silicon dioxide and the nano-calcium carbonateis added, and micropores of the set cement can be effectively filled, so that the system becomes denser. Therefore, the volume shrinkage of the set cement is relieved.