49results about How to "High mass percentage" patented technology

The invention relates to the technical field of synthesizing of graphene materials and provides a preparation method of nitrogen-doped graphene. The preparation method includes: using an improved Hummers method to prepare continuous large-piece graphene oxide; using a hydrothermal method to prepare the graphene oxide into graphene of a porous three-dimensional structure; ultrasonically dispersing the graphene of the porous three-dimensional structure into an acid solution with the pH being 1-5, adding aniline, well mixing, adding ammonium persulfate, well mixing, and transferring the obtained mixed liquid into a teflon container for hydrothermal reaction so as to obtain a porous three-dimensional graphene-polyaniline compound; performing high-temperature treatment under nitrogen protection to allow polyaniline to decompose out nitrogen sources so as to obtain the nitrogen-doped porous three-dimensional graphene. The method has the advantages that the nitrogen-doped graphene with high nitrogen content can be prepared, the structure of the three-dimensional graphene can be kept, the obtained nitrogen-doped porous three-dimensional graphene is good in electrochemical performance and quite suitable for being used for producing a super capacitor, and the method is convenient to operate and beneficial to industrial popularization.

The invention provides modified biomass charcoal for treating arsenic pollution as well as a preparation method and an application of the modified biomass charcoal. The preparation method of the modified biomass charcoal comprises steps as follows: (1) biomass raw materials are charred, and the biomass charcoal is obtained; (2) the biomass charcoal is subjected to a reaction with a hydrochloric acid solution, solid-liquid separation is performed, a solid substance is obtained, is washed till the pH is neutral and then is dried, and the pretreated biomass charcoal is obtained; (3) the pretreated biomass charcoal and a FeCl3 solution are subjected to a reaction under the condition that the solution pH is neutral, solid-liquid separation is performed after the reaction, and mud cake is obtained; (4) the mud cake is dried and then washed till the pH is neutral, solid-liquid separation is performed, an obtained solid is dried for a second time, and the modified biomass charcoal is obtained. The modified biomass charcoal has large specific surface area and high iron content; the preparation method is simple and easy to operate; the modified biomass charcoal can be applied to treatment of arsenic waste and passivation of arsenic in farmland soil, and food safety is guaranteed.

A ceramic member in which the metal layers with high void ratio are sufficiently sintered to lower a residue of resin is produced.

The method for manufacturing a ceramic member which comprises a step of forming a stacked compact from a plurality of metallic paste layers containing a metal component M₁ that are stacked one on another via ceramic green sheets, and a step of firing the stacked compact, wherein at least one of plural metallic paste layers is formed as a second metallic paste layer that has the mass percentage X higher than that of the metallic paste layer that adjoin therewith in the stacking direction, the mass percentage X being the proportion of the metal component M₁ to the total metal content in the metallic paste layer.

The invention belongs to the technical field of the lithium-ion power battery, and particularly relates to a liquid injection method of a lithium-ion power battery. The liquid injection method of the lithium-ion power battery comprises the following steps of: step one, injecting a liquid for the first time, putting an electrical core into a packaging shell, and injecting an electrolyte E1 containing a high-temperature additive A1 to carry out formation, air exhaust and volume testing; and step two, injecting a liquid for the second time, injecting an electrolyte E2 containing a high-temperature additive A2 after the volume testing, and then testing the voltage, the internal resistance and the K value of the battery. Compared with the prior art, the liquid injection method of the lithium-ion power battery provided by the invention utilizes electrochemical characteristics of the high-temperature additives containing functional groups of olefin and a two-time liquid injection mode to adjust the content of the high-temperature additives of the two-time injection liquid. The liquid injection method of the lithium-ion power battery not only prevents a compact SEI film from forming at the time of the initial charging, but also retains higher concentration additives in the normal use process of the electrical core. Under the condition of not enhancing the internal resistance of the electrical core, the high temperature storage performance of the battery is improved, and the service life of the battery is prolonged.

The invention provides a synthetic method of a water medium dispersed cerium zirconium oxide nano material. The synthetic method comprises the following steps: (1) performing a precipitation reaction by using an inorganic salt aqueous solutios of Ce and Zr and an inorganic base aqueous solution of Ce and Zr to prepare a Ce-Zr mixed hydroxide precipitate; (2) heating and refluxing the Ce-Zr mixed hydroxide precipitate to prepare a Ce-Zr hydroxide cosolubilization body; (3) filtering and washing the Ce-Zr hydroxide cosolubilization body to prepare a Ce-Zr hydroxide hydrogel; (4) mixing the Ce-Zr hydroxide hydrogel with organic alcohol, organic acid and high polymer to prepare a Ce-Zr oxide synthetic sizing material; and (5) heating and further performing hydro-thermal synthesis on the Ce-Zr oxide synthetic sizing material to obtain the water medium dispersed cerium zirconium oxide nano material. The cerium zirconium oxide nano particles obtained by the method provided by the invention are single crystals, have a nano scale of 2-8nm, and are monodispersed in a water medium; and the mass of cerium zirconium oxide accounts for 5-10% of the sol body volume of the nano material.

The invention discloses a process for refining gulonic acid. The process comprises the following steps of: performing ultrafiltration on fermentation liquor containing sodium gulonate; acidizing the fermentation liquor subjected to the ultrafiltration by using an ion exchange device, wherein the pH value of the fermentation liquor in the ion exchange device is below 2.0; performing nanofiltration preconcentration on the acidized fermentation liquor to obtain preconcentrated liquor; adsorbing the preconcentrated liquor by using active carbon or adsorbent resin; and performing triple effect evaporation on the adsorbed preconcentrated liquor to obtain concentrated liquor, and crystallizing the concentrated liquor to obtain a gulonic acid crystal. In a refining process route, the fermentation liquor is subjected to the ultrafiltration, ion exchange, the nanofiltration preconcentration to remove a large number of macromolecular impurities and soluble protein, and the preconcentrated liquor subjected to the nanofiltration preconcentration is adsorbed to remove impurities such as residual sugar, the soluble protein, pigments and the like further, so the quality of feed liquor before crystallization is optimized, the purity and yield of products are improved, and the discharge capacity of mother liquor is reduced.

The invention discloses a method for improving the purity of raffinose. A fixed bed adsorption separation method is adopted to implement the separation of the raffinose from impurities such as salt, protein, monose, sucrose and the like by utilizing the one-step adsorption separation, so that the mass percentage content of the raffinose in the dry basis is increased from 30%-50% to above 90%, and simultaneously, the loss rate of the raffinose is not more than 3%. The method has the advantages of simple process, convenient adsorbent regeneration, low production cost, short separation period, and easy implementation of the industrial production.

The invention provides a catalyst system for selective oligomerization of ethylene, and belongs to the technical field of catalysis. The catalyst system includes a ligand a and a transition metal compound b which is a metal compound of an IVB-VIII group; the general structural formula of the ligand a is shown in a formula I (please see the specification for the formula I), wherein R1, R2, R3, R4,R5 and R6 in the formula I are correspondingly and independently selected from hydrogen, alkyl or aryl; and n in the formula I is an integer and greater than or equal to 2 and less than or equal to 10. The catalyst system is used for selective oligomerization of the ethylene, the catalyst system has high catalytic activity, the total selectivity of target products, namely 1-hexene and 1-octylene is high, and the mass percentage content of C6-C8 linear alpha-olefin in the products reaches 90% or above; and at the same time, the dosage of activators is small, and the cost of the catalyst systemis low.

The invention relates to a preparation method for nitrogen-doped graphene. The method comprises the steps of: preparing graphite oxide from graphite; adding the graphite oxide into deionized water, conducting ultrasonic treatment, then adding aniline and carrying out ultrasonic mixing, thus obtaining a suspending solution; at a temperature of 0DEG C-10DEG C, adding hydrochloric acid into the suspending solution till the pH value of the suspending solution reaches 3-5, then adding benzoyl peroxide, carrying out polymerization reaction under stirring for 12h-20h, and then performing filtering, washing and drying to obtain a graphene oxide-polyaniline mixture; and in an oxygen-free atmosphere, subjecting the graphene oxide-polyaniline mixture to heating and heat preservation reaction, and conducting cooling, thus obtaining the nitrogen-doped graphene. The nitrogen-doped grapheme prepared by the method provided by the invention has a high nitrogen content. In addition, the invention also relates to a nitrogen-doped graphene.

The invention provides a method for purifying 5-hydroxymethylfurfural.Industrial-grade 5- hydroxymethylfurfural is adsorbed in a chromatographic column with adsorbent prepared through the patented technology, so that a 5-hydroxymethylfurfural purified product is obtained.

The application discloses a device and a method for preparing coated powder. The device mainly comprises a plasma torch, an atomizing nozzle, a reactor, a first powder feeder and a second powder feeder. The method for preparing the coating powder comprises the following steps of step S1, generating a heat source plasma; step S2, sending powder particles A into the plasma; step S3, sending powder particles B into a metal jet generated by the powder particles A; and step S4, preparing the coated powder A and B. The coated powder has the characteristics of low oxygen content and impurity content,no foreign pollution, high fluidity and the like, solves the problem of difficulty in feeding fine powder particles in the field of powder metallurgy, solves the problem of uneven hard phase distribution in the field of coating preparation, improves the mechanical properties of molded parts.

The invention provides a method for preparing water glass by utilizing purified iron tailings, and belongs to the technical field of water glass, aiming at solving the problems of serious resource waste and environmental pollution caused by discharge of a large amount of iron tailings. According to the technical scheme of the method for preparing the water glass by utilizing the purified iron tailings, firstly, silicon-rich raw materials are separated from the iron tailings, then the silicon-rich raw materials are subjected to acid leaching, acid-soluble impurities in the silicon-rich raw materials are removed, then washing and drying are conducted, quartz sand raw materials are obtained, finally, the quartz sand raw materials and an alkaline solution are added into a reaction kettle for a reaction, cooling and filtering are conducted after the reaction is completed, and concentrating is carried out on the liquid after filtration to obtain a water glass product. According to the method, a valuable component SiO<2> in the iron tailings is separated out and then reacts with the alkaline solution, and the liquid water glass with the modulus of 2.5-3.5 is prepared; and according to the method, the purified iron tailings are used for preparing the high-added-value product sodium silicate, so that harmless treatment and resource utilization of the iron tailings are achieved, and the economic and social benefits are remarkable.

The invention discloses a method of preparing a target material for high-purity aero-engine blade bonding coating. The method is characterized by sequential comprising the following steps the raw materials are pretreated; a crucible and an ingot mold are pretreated, a graphite ingot mold which is subjected to vacuum induction melting and a graphite ingot mold which is modeled by a molding sand box are put in a resistance furnace , when the temperature is heated to 1170-1175 K, and the temperature is kept for 2-4 hours; and the crucible and the fully preheated ingot mold are installed in a vacuum induction smelting furnace; burdening and charging are carried out; vacuumizing is carried out; melting is carried out until all metal blocks are molten; an aluminum block is added; slagging off is carried out; argon gas is introduced; a yttrium block is added; refining is carried out; and casting and forming is carried out, and finally the material is taken to obtain the target material. According to the method, procedures of the selecting of raw materials of the production process, the removing of oxide skin, controlling and optimizing of the components, cleaning of the crucible and theingot mold, smelting of protection atmosphere and the like are controlled strictly, and the introduction of impurity elements can be avoided in each procedure, so that the high-purity MCrAlY target material is obtained.

The invention provides a method for purifying 2, 5-furan dicarbaldehyde. The method is characterized in that crude 2, 5-furan dicarbaldehyde is mixed with deionized water under appropriate temperature, the mixture is allowed to pass a chromatographic column with absorbent for absorption under appropriate temperature and flow speed, and then dewatering is performed to obtain the purified 2, 5-furan dicarbaldehyde.

The present disclosure relates to complexes and compositions of cationic compounds combined with low mass percentages of PEGylated compounds, such as PEGylated lipids, for the delivery of nucleic acids and other polyanionic cargoes to cells, methods for preparing complexes and compositions comprising one or more cationic compounds and a low mass percentage of PEGylated compounds with polyanionic compounds, and methods for delivering the polyanionic compounds to cells.

The invention provides a carbon-sulfur composite material which comprises a high-porosity porous carbon matrix loaded with a small amount of one or more than two metals and/or metal compounds of Co, Fe, Ni, Cr, Mn and Zn in situ, and sulfur particles, a three-dimensional interconnected electron conduction path with a rich interface and a rapid ion diffusion channel are constructed through high-porosity graded porous carbon, pores of a porous carbon matrix are partially filled with sulfur particles, the surfaces of nano carbon particles are partially coated with sulfur particles, electrons and lithium ions are in full contact with active sulfur at the interface, and the active sulfur and the lithium ions are in full contact. The carbon-sulfur composite material has the advantages that the utilization rate of sulfur is increased, the mechanical stability of an electrode is improved, a small amount of metal and/or compounds are uniformly dispersed among the nano carbon particles, effective chemical adsorption is performed on polysulfide, meanwhile, electrochemical conversion of lithium polysulfide to Li2S2/Li2S is promoted, and the electrochemical performance of the carbon-sulfur composite material is improved.