13results about How to "Reduce metal content" patented technology

Thiourea, a preparation method thereof and a preparation method of thiourea dioxide. The invention provides thiourea. The sum of metal contents in the thiourea is smaller than or equal to 10 ppm. The invention also provides a preparation method of thiourea, which comprises the following steps: reacting hydrogen sulfide with lime nitrogen to obtain a thiourea crude product; and purifying the thiourea crude product by adopting ion exchange resin to obtain thiourea. The invention also provides a preparation method of thiourea dioxide. According to the method, the ion exchange resin is adopted for purifying the crude thiourea product obtained through reaction of hydrogen sulfide and lime nitrogen, the content of single metal in the crude thiourea product can be further reduced from 10 ppm to 2.5 ppm or below and even 1.0 ppm or below, and the total metal content is reduced from 20 ppm to 10 ppm or below and even 5.5 ppm or below. When thiourea with low metal content is used for preparing thiourea dioxide, the utilization rate of hydrogen peroxide can be increased.

The application discloses a catalytic cracking slurry oil hydrogenation protective agent and a preparation method thereof. The hydrogenation protective agent comprises a carrier and hydrogenation active metal, wherein the carrier is alumina, the hydrogenation active metal comprises molybdenum oxide and cobalt oxide, and the alumina carrier has the following properties: the most probable pore diameter is 40-100 nm, preferably 50-70 nm, and the pore volume of the pore with a diameter of (the most probable pore diameter-30) nm to (the most probable pore diameter+30) nm accounts for more than 75% of the total pore volume. The hydrogenation protective agent adopts the alumina carrier with a suitable pore diameter and a suitable large-pore pore volume ratio, can eliminate the diffusion resistance of macromolecules in the process of adsorption on the surface of the catalyst and reaction of catalytic cracking slurry oil hydrogenation, and is beneficial to the hydrogenation reaction.

A current collector includes a substrate layer and a conductive layer. The conductive layer is arranged on a surface of the substrate layer. The substrate layer includes a polymer layer and a metal material layer connected to each other. The metal material layer is connected to the conductive layer, and partially extends out of the conductive layer. A pole piece and a battery are further provided. The current collector has reduced metal content and improved weight energy density. Moreover, the current collector can be structurally damaged at the early stage of the thermal runaway, preventing the thermal runaway.

The invention relates to the technical field of comprehensive utilization of metallurgical solid wastes, in particular to a comprehensive treatment method of vanadium-containing steel slag, which comprises the following steps: adding the ground vanadium-containing steel slag into an acid leaching solution for leaching reaction, and carrying out solid-liquid separation on the reacted mixture to obtain tailings rich in metal elements and a solution rich in calcium ions; cO2 gas is introduced into the solution rich in calcium ions for a mineralization reaction, and calcium carbonate precipitates are obtained; a tempering agent and a reducing agent are added into the tailings rich in metal elements, pelletizing, drying and smelting are conducted in sequence, and vanadium-containing pig iron is obtained; wherein the step S2 and the step S3 are not limited in sequence. The comprehensive treatment method for the vanadium-containing steel slag shows remarkable beneficial technical effects in the aspects of improving the recovery rate of metal elements, reducing the treatment cost and realizing maximum utilization of resources, so that environmental pollution is reduced, and sustainable utilization of the resources and sustainable development of economy are promoted.

This invention provides a solar cell, its fabrication process, a tandem solar cell, and a photovoltaic module. The fabrication process of the solar cell includes: providing a cell substrate; printing a conductive material onto the cell substrate; and curing the conductive material to form initial grid lines. The conductive material includes bismuth-based lead-free glass; the conductive material also includes copper powder and nickel powder; the mass ratio of copper powder to nickel powder is 80~99.5:0.5~20, and the copper powder includes flake-shaped copper powder and spherical copper powder. In the fabrication process of this invention, the conductive material, through a ternary synergistic system of "copper-nickel-glass" and a dual-morphology copper powder composite design, achieves multiple effects such as suppressing copper diffusion and oxidation and improving adhesion under an air-sintering atmosphere, thereby improving the fill factor and photoelectric conversion efficiency of the solar cell.

To provide a fluorinated elastic copolymer in which the contents of metal elements and chloride ions are low, and a method for producing a fluorinated elastic copolymer, whereby it is possible to obtain a fluorinated elastic copolymer in which the contents of metal elements and chloride ions are low. A fluorinated elastic copolymer in which the content of metal elements is at most 20.0 ppm by mass and the content of chloride ions is at most 1 ppm by mass; and a method for producing a fluorinated elastic copolymer, which comprises coagulating a fluorinated elastic copolymer in a latex containing the fluorinated elastic copolymer by using an acid containing no metal elements or no chloride ions, and washing the coagulated fluorinated elastic copolymer with a liquid medium having a content of metal elements of at most 2.0 ppm by mass and a content of chloride ions of at most 2 ppm by mass.

The invention discloses a coupling process for preparing biodiesel from waste oil and fat, comprising the following steps: 1) removing solid impurities from the waste oil and fat, mixing the waste oil and fat with alcohol and a liquid acid catalyst for pre-esterification reaction to generate a pre-esterified mixture; 2) mixing the pre-esterified mixture with water and passing it into a liquid-liquid separator, separating the water phase and removing metal ions to obtain an esterified product II; 3) mixing the esterified product II with a sulfiding agent and H 2 After mixing, a pre-hydrogenation reaction is carried out to generate product I; 4) product I is separated from the oil phase and then mixed with H 2 The mixture is introduced into a fixed bed reactor, and separated by a gas-liquid separator to obtain an oil phase product II; 5) the oil phase product II and hydrogen are introduced into a hydroisomerization reactor to react and generate product II; 6) product II is introduced into a gas-liquid separator, and the separated liquid phase product is introduced into a fractionation tower to separate the biodiesel product. The production process of the present invention is stable and reliable, and has strong raw material adaptability. In addition, the catalyst and excess hydrogen and other raw materials can be recycled during the production process to ensure the long-term operation of the system.

This invention provides a method for preparing and applying a trifluoromethoxyamide-bridged aromatic amine compound. The preparation method utilizes a continuous flow reaction system comprising two continuous flow reaction units connected in series, namely reaction unit A and reaction unit B. An amidation reaction is carried out in reaction unit A, and a reduction reaction is carried out in reaction unit B. The prepared trifluoromethoxyamide-bridged diamine compound exhibits high purity and whiteness and can be used to prepare polyimides for various electrical and optical components.

The invention relates to a gallium-containing pseudo-boehmite and a gallium oxide-aluminum oxide compound, and the gallium-containing pseudo-boehmite comprises the following components in percentage by weight: 0.05 to 8.5 percent of gallium, 30.0 to 45.0 percent of aluminum, and the balance of aluminum and unavoidable impurities, and is characterized in that the gallium-containing pseudo-boehmite is prepared from the following components in percentage by weight: 0.05 to 8.5 percent of gallium and 30.0 to 45.0 percent of aluminum; xRD (X-Ray Diffraction) characterizes that diffraction peaks exist when the angle 2 theta is 13.1 + / -1 degrees, 27.8 + / -1 degrees, 38.4 + / -1 degrees, 49.3 + / -1 degrees and 64.7 + / -1 degrees. The preparation method of the gallium-containing pseudo-boehmite comprises the following steps: preparing a gallium-aluminum alloy solution, reacting the gallium-aluminum alloy solution with hot water, and separating the gallium-containing pseudo-boehmite. In the gallium oxide-aluminum oxide compound, the content of gallium in terms of oxide is 0.1 wt%-12.0 wt%, the mass ratio of aluminum oxide to gallium oxide is 7-1000, the pore volume is 0.35-1.20 mL / g, the specific surface area is 180-500 m < 2 > / g, and the most probable pore diameter is 4.0-10.0 nm. The obtained gallium-containing pseudo-boehmite and gallium oxide-aluminum oxide compound hardly contains impurity elements, the pore volume and the specific surface area are large, no sewage is discharged in the preparation process, and the operation is simple.

The utility model relates to an ultra-pure polyethylene slurry method production system which comprises a reaction kettle provided with a slurry discharge port; the flash tank is connected with the slurry discharge hole of the reaction kettle, and a gas circulating pipeline is arranged at the top of the flash tank and is used for circulating flashed gas components to the reaction kettle; the rotary drum filtering unit is connected with a discharge hole of the flash tank and is used for sequentially filtering, washing and drying the flashed slurry, a filtrate outlet of the rotary drum filtering unit is connected with a solvent collecting tank, and the solvent collecting tank is communicated with the reaction kettle through a pipeline and is used for circulating a solvent to the reaction kettle. Compared with the prior art, the system has the advantages that the reaction kettle, the flash tank and the rotary drum filtering unit are efficiently connected, solvent and unreacted gas raw materials are recycled, a closed-loop material circulation system is formed, and waste and emission of the raw materials are reduced. According to the drum filter unit, the traditional dispersed procedures of filtering, washing and drying are integrated into an integrated process, so that the number of equipment and the occupied area are greatly reduced, and the operation and maintenance cost is reduced.

The invention belongs to the technical field of inorganic materials, and particularly discloses a method for producing water glass and co-producing sylvite by utilizing biomass, which comprises the following steps: (a) carrying out oxygen-enriched combustion on the biomass at 650-800 DEG C; (b) mixing biomass ash obtained by combustion with water, carrying out heating pretreatment, and carrying out solid-liquid separation while the mixture is hot after the heating pretreatment is ended, so as to obtain clarified filtrate and a biomass ash filter cake; (c) mixing the biomass ash filter cake with an alkali solution, dissolving, and performing solid-liquid separation to obtain biomass ash and water glass; and (d) continuously recycling the clarified filtrate until crystals are separated out, continuously cooling and crystallizing, and carrying out solid-liquid separation to obtain the sylvite. According to the method, the directional conversion mode of the potassium element in the biomass is achieved, the potassium element is directly extracted, the treated biomass ash enters the rear end to be prepared into the water glass, synchronous production of the bio-based water glass and the high-purity potassium salt is directly achieved, the process is simple, the cost is low, and an innovative path is provided for industry green transformation.

This invention discloses a green production method for biodiesel. First, pretreated feedstock oil and methanol are preheated and then fed into a reactor loaded with a superhydrophobic polymer solid acid catalyst for esterification. After oil-water separation, the oil phase is then fed into a reactor loaded with a macroporous strong-base ion exchange resin for transesterification. The biodiesel product is collected by vacuum distillation. The biodiesel production method provided by this invention has strong feedstock adaptability, no wastewater discharge, and excessive energy consumption. Methanol can be recycled, resulting in high feedstock utilization and product quality. Furthermore, the catalyst is simple to prepare, the reaction rate is fast, and the active phase is not easily lost.

The invention belongs to the technical field of petrochemical engineering, and particularly relates to petroleum coke special for a prebaked anode produced by taking high-sulfur high-acid crude oil as a raw material and a preparation method of the petroleum coke. According to the preparation method of the special petroleum coke for the prebaked anode, high-sulfur and high-metal crude oil is taken as a raw material, vacuum residue is prepared through reduced pressure distillation, then the high-sulfur and high-metal vacuum residue is treated by using a demetallization agent, and then the vacuum residue is subjected to mild hydrotreatment, so that a petroleum coke product with low metal content and sulfur content can be finally obtained. According to the preparation method of the special petroleum coke for the prebaked anode, the special petroleum coke for the high-end prebaked anode can be produced by utilizing inferior crude oil, so that the production raw material source of the petroleum coke is expanded, and the additional value of inferior ethylene tar is increased.