16 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.

The invention discloses a system and method for pretreating sludge through microwave-chemical synergistic dehydration coupling pyrolysis, and belongs to the technical field of sewage sludge treatment.The method comprises the steps that municipal sludge and a FeCl3 / quick lime composite conditioner are mechanically mixed and then subjected to a microwave reaction, and microwave field distribution is regulated and controlled in real time; and carrying out filter pressing, tail gas treatment and microwave catalytic oxidation to complete microwave-chemical synergistic dehydration coupling pyrolysis pretreatment on the sludge. By constructing a synergistic mechanism of a microwave electromagnetic field and a composite chemical conditioner, directional destruction of a colloid structure and space-time coupling of a pyrolytic reaction are realized on a molecular level. The FeCl3 / quick lime composite conditioner generates an ion polarization effect in a microwave field, quick lime hydration heat release and microwave dielectric heating form a temperature gradient field, conditioner particles are promoted to penetrate through the interior of sludge floc, the combined water conversion efficiency is improved, the microwave heat effect initiates selective cracking of VOCs, and by regulating and controlling the temperature, the VOCs can be effectively decomposed. Bond breaking of long-chain organic matters is promoted to be converted into small molecular substances, and formation of a dioxin precursor is inhibited from the source.

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.

A large area microwave plasma chemical vapour deposition, LA MPCVD reactor apparatus and method for large area microwave chemical vapour deposition, comprising a reactor chamber adapted to provide a plasma region in an interior of the reactor chamber by electromagnetic energy at a first frequency, and a CRLH waveguide section adapted to operate with an infinite wavelength at the first frequency and having in a wall a coupler means arranged to couple electromagnetic energy from an interior of the CRLH waveguide section to the interior of the reactor chamber.

The present invention discloses a method for rapidly preparing a binary alloy high-efficiency absorbing material using microwave assistance and the prepared absorbing material, comprising the following steps: (1) uniformly dispersing melamine in deionized water, and dispersing and dissolving cobalt nitrate hexahydrate in the above solution to form a precursor reaction solution A; (2) dispersing and dissolving dimethylimidazole in deionized water to form a solution B; (3) stirring and mixing solutions A and B and placing them in a microwave chemical reactor for solvent thermal reaction to obtain a composite precursor; (4) placing the obtained precursor and ferrocene in a tube furnace for heat treatment to obtain a hierarchical carbon-coated alloy final product. The prepared absorbing material has the characteristics of high electrical conductivity and high saturation magnetic intensity. The preparation method can achieve the advantages of large-scale, rapid preparation, simplicity, and good controllability of nano-absorbing materials, providing a reliable preparation method for high-efficiency electromagnetic wave absorbing materials.

The invention provides a fly ash slag and sludge synergistic stabilization treatment method which comprises the following steps: S1, adding a composite conditioner into sludge, destroying a colloid structure through microwave-assisted heating, and synchronously reducing the moisture content from 80% to 35% or below in combination with plate-frame pressure filtration; s2, 3%-5% of modified zeolite is doped, free water is preferentially adsorbed, a microporous water locking structure is formed, and moisture remigration in the subsequent curing reaction is avoided; in order to solve the problem of high water content of sludge, a microwave-chemical coupling dehydration and modified zeolite water locking technology is adopted, the water content is reduced from 80% to 35% or below, the upper limit of traditional curing water content 60% is broken through, water interference is eliminated through a staged dry-wet mixing process, and meanwhile, due to the fact that the heavy metal locking time is short, the water content is reduced to 30% or below. A double-effect stable system of vulcanization-phosphate chemical precipitation and geopolymer physical wrapping is constructed, slow-release pH regulation and hydrophobic membrane protection are combined, the locking life is prolonged to 3 times that of a traditional method, and strength improvement and long-acting stability collaborative optimization are achieved.

The invention discloses a preparation method of 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-ethyl formate. The preparation method comprises the following steps: (1) preparing a solvent solution containing 5-(difluoromethyl)-1-methyl-1H-pyrazole-4-ethyl formate; and (2) adding the solution in the step (1) into a microwave chemical reactor, reacting for a certain time, and carrying out reduced pressure distillation to obtain the 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-ethyl formate. The preparation method has the advantages of low energy consumption, high reaction rate, high product yield, suitability for industrial large-scale production and the like.

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 present invention discloses a method for preparing rubber asphalt with controllable activation. The specific process is as follows: a microwave activator, rubber powder, base asphalt, additives, and accelerator are rapidly sheared at 160-170°C for 10-20 minutes to fully mix and obtain rubber asphalt S1; the rubber asphalt S1 is stirred in a microwave chemical synthesizer for a stirring time t1 of 10-50 minutes and a stirring temperature T1 of 140-170°C to fully desulfurize the rubber particles to obtain rubber asphalt S2; the stirring temperature T2 of the microwave chemical synthesizer is then adjusted to 180-190°C and the stirring time t2 is 5-10 minutes to finally obtain the rubber asphalt. The rubber asphalt can not only form a stable network interconnected structure, improve the rubber asphalt's crack resistance and enhance the stability of its mechanical properties, but also significantly improve the rubber asphalt's adhesion and enhance its resistance to water damage.

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.