20results about How to "Reduce metal content" patented technology

The present invention discloses a method for regenerating waste lubricating oil, and relates to the technical field of waste lubricating oil regeneration. The present invention utilizes modified attapulgite to perform adsorption decolorization and heavy metal removal of waste lubricating oil, so that the doped heavy metal salt forms inorganic matter attached to the surface of attapulgite, and the metal ions in the waste lubricating oil can be efficiently removed, greatly reducing the metal content in the waste lubricating oil; the present invention subjects the pretreated waste lubricating oil to two refining treatments, and adopts a high-temperature nitrogen spraying method to the waste lubricating oil to accelerate the vaporization reaction of the impurity components and improve the properties of the regenerated oil products, and then performs a second hydrogenation refining treatment to hydrogenate and saturate non-ideal components such as nitrogen-containing compounds and sulfur-containing compounds, and vaporize and remove them at high temperature; the present invention combines the pretreatment process with the hydrogenation post-treatment process to improve the properties of the regenerated oil products, and the process flow is simple, which is superior to the multi-tower equipment process of the prior art.

The invention relates to a fluorine-containing copolymer resin acid treatment and precipitation separation purification method which comprises the following steps: S1, pretreatment: soaking and cleaning powdery fluorine-containing copolymer resin with ultrapure water to remove suspended pollutants; s2, dissolving: dissolving the fluorine-containing copolymer resin pretreated and dried in the step S1 into an organic solvent; s3, acid treatment: adding an acid solution into the fluorine-containing copolymer solution obtained in the step S2, and fully mixing; s4, precipitation: adding the solution obtained in the step S3 into ultrapure water under a stirring condition, and precipitating to separate out a white solid; s5, solid-liquid separation: filtering or centrifuging the dispersion liquid containing the white solid obtained in the step S4 to obtain a fluorine-containing copolymer resin solid, and drying the fluorine-containing copolymer resin solid; and S6, repeated purification: repeating the steps S2-S5 on the fluorine-containing copolymer resin solid obtained in the step S5. According to the invention, trace metal and other impurity residues can be removed, the subsequent polarization requirement is met, and the electric breakdown probability is greatly reduced.

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.

The invention relates to the technical field of silica sol preparation methods, in particular to a method for preparing large-particle-size spherical silica sol by gradient addition of a catalyst. The preparation method of the large-particle-size spherical silica sol comprises the following steps: (1) mixing tetraethoxysilane, water and an organic solvent according to a certain proportion to prepare a material A, putting the material A into a constant-temperature water bath reactor, uniformly stirring, and adjusting to a set temperature for later use; and (2) gradually adding a certain amount of basic catalyst into the material A in a flow velocity gradient decreasing or increasing manner, and continuously reacting for a certain time after the catalyst is added, so as to obtain spherical silica sol with different particle sizes. The large-particle-size spherical silica sol prepared by the method is good in uniformity, good in batch-to-batch repeatability and high in purity, and can be used for preparing a polishing solution for a silicon wafer.

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.

The present invention proposes a cobalt single-atom catalyst loaded on Mo2TiC2Tx and its preparation method and application, which belongs to the field of catalyst technology. The method comprises the following steps: adding Mo2TiAlC2 powder to HF solution, stirring for reaction; washing and collecting the supernatant, washing with ethanol, washing with aerated deionized water, centrifuging, freeze-drying, and obtaining a black powder for use; taking the above black powder and adding it to tetrabutylammonium hydroxide solution, stirring at room temperature, washing the obtained suspension with aerated deionized water, adding deionized water for use; taking the above suspension in a beaker, adding Co(NO3)2·6H2O, stirring at room temperature until completely mixed, adding NaBH4 solution, stirring at room temperature, washing with aerated deionized water for several times, and freeze-drying to obtain a black powder. The catalyst of the present invention improves the catalytic activity and can increase the pollutant removal rate to 100% within 10 minutes, which is of great significance for actual sewage treatment.

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 discloses a method for preparing a cyclic carbonate by addition reaction of CO2 and epoxide. The method uses CO2 and epoxide as reactants, a bridged metal porphyrin as a catalyst, and adopts an addition reaction to prepare the cyclic carbonate under the conditions of a reaction time of 12-48 hours and a reaction temperature of 80-160°C. The bridged metal porphyrin provided in the application is used as a catalyst for CO2, and has the advantages of high catalyst activity, stable performance, simple preparation method, low cost, easy catalyst recovery, mild reaction conditions, high yield, and the like.

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 relates to a metal content control method for an epitaxial furnace cavity, which comprises the following stages: a cleaning stage: removing residual substances in the cavity; gas is introduced into the cavity to remove dust and impurity residues, then the heating element is used for removing organic matter and moisture on the surface of the substrate, the temperature and pressure in the cavity are kept stable after the steps are completed, and finally residual matter on the surface of the substrate is removed in the etching step; a coating stage: growing a silicon layer with controllable thickness on the surface of the base; gas is introduced into the cavity to remove residual substances, the temperature and the pressure in the cavity are kept stable after the steps are completed, and finally a silicon layer with the controllable thickness is generated on the surface of the base in the coating step; in the cooling stage, the temperature of the cavity is ensured to be 25 DEG C; the method comprises the following steps: firstly, introducing gas into a cavity to remove residual substances, and then reducing the temperature of a substrate to 25 DEG C; by optimizing the etching step and the coating step, the problem that the metal of the epitaxial wafer exceeds the standard is solved, so that the quality of the epitaxial wafer is improved.

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.

The invention relates to a method for preparing a low-molecular-weight propylene copolymer and the low-molecular-weight propylene copolymer prepared by the method. The preparation method has the advantages of high polymerization activity, mild polymerization conditions, easiness in operation, high volatile component removal efficiency and extremely low metal content in the obtained polymer. The low-molecular-weight propylene copolymer provided by the invention is narrow in molecular mass distribution, low in density, wide in melting point and melt viscosity regulation range, suitable for processing technologies at various different temperatures, high in comonomer insertion rate, and more excellent in resin compatibility compared with a homopolymer; and the dispersing agent can be used as a dispersing agent, a modifying agent or a processing aid, and is beneficial to improving dispersion uniformity, precipitation uniformity and processing flowability.