摘要:
A microwave-plasma system for generating fixed-nitrogen products comprises a microwave generator operably coupled with a gas chamber where the microwave generator provides microwave power to the gas chamber. The system further includes a source of gas, which may be for example oxygen, nitrogen and/or air, operably coupled with the plasma chamber. The microwave power produces a plasma of the gas within the chamber. The system further includes an absorber unit fluidically connected to the gas chamber to capture product from the plasma in the gas chamber. The captured product may include fixed nitrogen gaseous products.
摘要:
Conversion of heavy fossil hydrocarbons (HFH) to a variety of value-added chemicals and/or fuels can be enhanced using microwave (MW) and/or radio-frequency (RE) energy. Variations of reactants, process parameters, and reactor design can significantly influence the relative distribution of chemicals and fuels generated as the product. In one example, a system for flash microwave conversion of HFH includes a source concentrating microwave or RF energy in a reaction zone having a pressure greater than 0.9 atm, a continuous feed having HFH and a process gas passing through the reaction zone, a HFH-to-liquids catalyst contacting the HFH in at least the reaction zone, and dielectric discharges within the reaction zone. The HFH and the catalyst have a residence time in the reaction zone of less than 30 seconds. In some instances, a plasma can form in or near the reaction zone.
摘要:
A system for processing hydrocarbon materials, comprising a hydrocarbon feedstock source; a process gas source; a waveguide; and a reaction tube structure. The process gas source comprises one or more sources of gases selected from the group consisting of helium, argon, krypton, neon, xenon, methane, propane, butane, ethane, acetylene, propylene, butylene, ethylene, carbon monoxide, carbon dioxide, water vapor, hydrogen, and nitrogen. The waveguide comprises a lateral portion comprising housing having a first end portion configured to be connected to a microwave generator, a closed opposite end portion, a primary axis extending from the first end portion to the second end portion, and a central portion having an opening, wherein the central portion has a depth that is smaller than a corresponding depth of the first end portion and the second end portion, and a coaxial portion having a first end portion connected to the opening and a lateral dimension that is perpendicular to the primary axis. The reaction tube structure comprises an outer wall made of a dielectric material, and is configured such that when hydrocarbon feedstock from the feedstock source and process gas from the process gas source are fed into the reaction tube structure and microwaves are received in the waveguide, one or more surface waves are propagated in the reaction tube structure to form a plasma within the reaction tube structure and cause the feedstock and process gas to react and form into a product stream, and wherein the reaction tube structure has a lateral dimension that is perpendicular to the lateral portion and parallel to the coaxial portion, and the reaction tube structure is connected to a second end of the coaxial portion.
摘要:
In order to provide a chemical reaction apparatus that can suppress a situation where microwaves are concentrated on a partial portion in a reactor, and that can more uniformly irradiate a content with the microwaves, a chemical reaction apparatus includes: a horizontal flow-type reactor in which a liquid content horizontally flows with an unfilled space being provided thereabove; a microwave generator that generates microwaves; and a waveguide that transmits the microwaves generated by the microwave generator to the unfilled space in the reactor, wherein a top of the reactor is curved with respect to a flow direction of the content.
摘要:
Microwave based systems and methods are provided for obtaining carbonaceous compounds from polypropylene-containing products. In one example, embodiment, a method is provided for recovering at least one organic decomposition product from a polypropylene-containing product, the method comprising: placing the polypropylene-containing product in a reduction zone of a material recovery system; flowing an inert gas through the reduction zone from a reduction inlet to a reduction outlet to purge the reduction zone and maintain a positive pressure therein; applying electromagnetic wave energy from an electromagnetic wave generator to the reduction zone via a bifurcated waveguide assembly, while maintaining the polypropylene-containing product in a stationary position for at least a portion of the applying, to yield at least one gaseous organic decomposition product; and exhausting the at least one gaseous organic decomposition product from the reduction zone along with the inert gas through the reduction outlet.
摘要:
A plasma reactor (10) comprises a microwave resonant cavity (12) having a gas inlet (18) and a gas outlet (20), a waveguide (14) for conveying microwave radiation to the resonant cavity, and a plasma torch (40) for injecting into the resonant cavity a plasma stream containing ions for reacting with a gas flowing from the gas inlet (18) to the gas outlet (20).
摘要:
A process including providing a reactant, the reactant coming into contact with a first material and chemically reacting therewith to form a first compound and produce structured particles is provided. In some instances, second material particles are at least partially coated with the first compound. The first material can contain a transition metal and the reactant can be provided to an afterglow region of a plasma and/or be provided downstream from the afterglow region. The reactant can contain an element such as oxygen, nitrogen, sulfur, phosphorus, fluorine, carbon, boride, chloride, and the like. In addition, the reactant can be a gas and the first compound can be an oxide, nitride, sulfide, phosphide, fluoride, carbide, boride, chloride, and/or combinations thereof.
摘要:
Plasma-assisted methods and apparatus that use multiple radiation sources are provided. In one embodiment, a plasma is ignited by subjecting a gas in a radiation cavity to electromagnetic radiation having a frequency less than about 333 GHz in the presence of a plasma catalyst, which may be passive or active. A controller can be used to delay activation of one radiation source with respect to another radiation source.
摘要:
The invention performs uniform chemical reactions with high efficiency by action of microwave onto reaction targets placed within a flow path along a center axis of a waveguide for transmission of microwave. The microwave chemical reaction device includes a circular waveguide for transmission of TM or TE mode microwave or a square waveguide for transmission of TE mode microwave and a flow path shielded from a space within the waveguide by a bulkhead of low microwave loss and coaxially extending along the center axis of the waveguide. Reaction targets to be subjected to chemical reactions are accommodated in the flow path and the microwave acts on the reaction targets within the flow path.
摘要:
An instrument and associated method are disclosed for conducting microwave assisted chemical reactions. The instrument includes a microwave cavity, preferably a closed microwave cavity, for conducting microwave assisted chemical reactions, and a source for applying microwave radiation within the cavity and to a vessel and its contents. The instrument also includes an illumination source for illuminating the vessel and its contents, as well as means for visually observing the vessel and its contents, an infrared detector for monitoring the temperature of the vessel and its contents, and means for preventing the illumination source from saturating the infrared detector, thereby enabling concurrent visual observation and infrared monitoring.