10 results about "Microwave chemistry" patented technology

The invention relates to a textured KCu7S4 thermoelectric material and a preparation method thereof, and the method comprises the steps: sequentially adding a prepared KOH aqueous solution, CuCl2. 2H2O and Na2S. 9H2O into a high-pressure kettle, and fully stirring for dissolving; dropwise adding an N2H4.H2O aqueous solution into the mixed solution, fully stirring, sealing, transferring to a microwave chemical synthesis instrument, heating, keeping stirring, and reacting at a target temperature and self-generated pressure to generate a KCu7S4 nanowire preferentially growing along a [001] crystal orientation; and after the reaction is finished and natural cooling is carried out, a product is collected through centrifugation, full cleaning and vacuum drying are carried out, and then the KCu7S4 thermoelectric material with [001] preferred orientation in the direction perpendicular to the pressure direction is obtained through spark plasma sintering. According to the method, a surfactant and an organic solvent are not used, and macro, rapid, efficient and controllable preparation of the KCu7S4 nanowire is realized through a low-temperature, low-cost and low-energy-consumption microwave-assisted hydrothermal process.

1. Name of the product in this design: Microwave Chemical Vapor Deposition Equipment (Type D). 2. Application of this design: Microwave chemical vapor deposition equipment for preparing diamond or large-area diamond films. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. The bottom surface of this product is a part that is not easily seen or cannot be seen during use, so the bottom view is omitted.

The present application discloses a method for preparing asphalt modification by activating asphalt with microwave chemical effect. The method is to activate asphalt with microwave heating equipment before mixing modifier with asphalt for modification. The activation of microwave heating is to make the asphaltene in asphalt homogenized and dispersed and the chemical property more active and the viscosity reduced by the chemical effect accompanying microwave heating. When the modifier is mixed with the microwave activated asphalt to prepare modified asphalt, better molecular cross-linking or more stable colloidal system and other favorable effects will be produced to obtain products with better performance. The initial temperature for heating asphalt is the temperature for liquid storage or pump allowing, and the temperature of asphalt is raised by 50-60 DEG C after microwave heating.

This invention discloses a method for preparing fluorescent carbon quantum dots using a pre-pressurized microwave-dilute acid etching process. The method involves digesting a carbon material sample with nitric acid solution, followed by ultrasonic treatment. 440 mL of high-purity water and 10 mL of concentrated HNO3 are added to a TFM (tissue-mixed vapor chamber) digestion vessel as the microwave medium, which is then placed in the stainless steel cavity of the UltraCLAVE super microwave chemistry platform. A digestion tube containing the suspended carbon material sample is fixed in the TFM vessel, with its bottom immersed in the microwave medium. The stainless steel cavity lid is then closed and locked, and the pressure within the cavity is adjusted to 40-70 Bar. The instrument cover is closed, and the microwave pressurization reaction is then performed. The solution in the digestion tube is transferred to a centrifuge tube and centrifuged at 8000 rpm for 1 min. The supernatant is collected, and the collected supernatant is purified to obtain fluorescent carbon quantum dots. Compared to the traditional strong acid oxidation method, this invention requires only dilute acid, uses a smaller amount of acid, operates under milder conditions, and is more environmentally friendly. It also improves work efficiency and significantly shortens the carbon quantum dot preparation time.

The invention provides a high-density antioxidant carbon-ceramic composite material and a preparation method thereof, and belongs to the technical field of carbon-ceramic composite materials. The preparation method comprises the following steps: carrying out surface treatment on a carbon felt, grafting carboxylated carbon nanotubes by an electrophoretic deposition method, coupling with nano TiC modified by an epoxy silane coupling agent, dipping in a mixed solution of polycarbosilane, divinyl benzene and xylene, heating, pressurizing, crosslinking and curing, heating and cracking under the protection of inert gas until a certain density is reached, and finally heating and cracking to obtain the carbon fiber composite material. The high-density antioxidant carbon-ceramic composite material is prepared. The carboxylated carbon nanotubes are grafted by adopting an electrophoretic deposition method and react with modified TiC, so that the prepared composite material has relatively good mechanical properties and oxidation resistance, the service life is prolonged, the material is densified by virtue of a microwave chemical vapor impregnation process and a precursor impregnation and pyrolysis method, and the service life of the material is prolonged. Therefore, the prepared carbon-ceramic composite material has relatively high density, and the application scene of the carbon-ceramic composite material is expanded.

The invention discloses a coal gangue microwave-chemical synergistic activation method and activated coal gangue, the coal gangue microwave-chemical synergistic activation method comprises the following steps: (1) crushing coal gangue to obtain a crushed product; (2) mixing the crushed product with a composite activator, and performing microwave treatment to obtain an activated product; the composite activating agent comprises waste alkali liquor, fly ash aluminum extraction residues and water glass; and (3) drying, cooling and grinding the activated product to obtain the activated coal gangue. The microwave-chemical synergistic activation method for the coal gangue is high in activation efficiency, efficient destruction of crystal lattices of coal gangue minerals is achieved through the synergistic effect of microwaves and the composite activating agent, the activation time is shortened, the silicon-aluminum dissolution rate is increased, the silicon dissolution rate reaches 80% or above, the aluminum dissolution rate reaches 70% or above, the problem that single chemical activation is low in efficiency is solved, and the method is suitable for industrial production. And the obtained activated coal gangue product has high activity.

The invention relates to the technical field of organic synthesis and microwave chemistry, and discloses a microwave-assisted rapid reaction method of matrichthrin, which comprises the following steps: S1, a condensation reaction stage: promoting a low-temperature condensation reaction of n-propionaldehyde and an alkaline solution through microwave radiation, controlling the reaction temperature at 0-5 DEG C, and accelerating the reaction process by using microwave radiation; and S2, a hydrogenation reaction stage: alternately replacing 2-methyl-2-pentenal in nitrogen and hydrogen by adopting a supported palladium catalyst and combining a microwave heating mode, then carrying out catalytic hydrogenation, and optimizing reaction conditions by adjusting microwave power and reaction pressure. The microwave-assisted technology is introduced, so that the reaction rate can be remarkably increased in the reaction stages of condensation, hydrogenation, oxidation, esterification and the like, the overall preparation time is effectively shortened, the problem that the operation time of a traditional method is long is solved, and the production efficiency of the matrichthrin is greatly improved.

The application provides a high-density antioxidative carbon ceramic composite material and a preparation method thereof, and belongs to the technical field of carbon ceramic composite materials. The carbon felt is subjected to surface treatment, carboxylated carbon nanotubes are grafted by an electrophoretic deposition method, the nanometer TiC modified by an epoxy silane coupling agent is coupled, the carbon felt is immersed in a mixed solution of polycarbosilane, divinylbenzene and xylene, cross-linking and solidification are carried out under heating and pressurization, pyrolysis is carried out under the protection of inert gas, the process is repeated until a certain density is reached, and finally pyrolysis is carried out, so that the high-density antioxidative carbon ceramic composite material is prepared. The carboxylated carbon nanotubes are grafted by the electrophoretic deposition method, and the TiC is modified, so that the prepared composite material has good mechanical properties and antioxidation performance, and the service life is prolonged. The material is densified by a microwave chemical vapor immersion process and a precursor impregnation and pyrolysis method, so that the prepared carbon ceramic composite material has high density, and the application scenarios of the carbon ceramic composite material are expanded.

The invention discloses a method for preparing lignin depolymerized oil through microwave coupling catalytic depolymerization of wood fibers, and belongs to the technical field of biomass conversion and utilization. The method comprises the following steps: putting a wood fiber raw material into a liquid-phase medium, and under the condition of microwave radiation, realizing efficient depolymerization of lignin by utilizing the synergistic catalysis of a transition metal catalyst, a hydrogen donor, a hydrogen acceptor catalyst and a solvent, thereby preparing the lignin depolymerized oil rich in lignin-derived monophenol, dimer and oligomer. According to the method, biomass-derived formic acid and hemicellulose are used as hydrogen sources, lignin oil rich in monophenol can be directionally prepared by a one-step method under the normal pressure condition, and meanwhile high-purity cellulose is co-produced; the method has the advantages that the hydrogen source system of the lignin hydrogenating and depolymerizing reaction is expanded, the reaction yield is obviously improved under the microwave chemical condition, the reaction conditions are reduced, and a new technical path is provided for the application of mildly catalyzing and depolymerizing the lignin to prepare high-value chemicals, fuels and polymer materials.

The application provides a preparation method of a phosphogypsum-based hydraulic material based on microwave chemical compounding, comprising the following steps: S1, removing impurities and drying phosphogypsum; S2, adding coke powder, sodium sulfate and calcined alunite, uniformly mixing, and microwave irradiating the mixture; S4, adding silicate cement clinker, steel slag powder, mineral powder and fly ash, uniformly mixing, and then crushing to 380-480 meshes; S5, adding calcium aluminate, quicklime and quick-dissolving solid water glass, mixing and grinding, and the phosphogypsum-based hydraulic material is obtained. The phosphogypsum-based hydraulic material has high strength.