374 results about "Nitrogen rich" patented technology

Methods and systems for low emission power generation in combined cycle power plants are provided. One system includes a gas turbine system that stoichiometrically combusts a fuel and an oxidant in the presence of a compressed recycle stream to provide mechanical power and a gaseous exhaust. The compressed recycle stream acts as a diluent to moderate the temperature of the combustion process. A boost compressor can boost the pressure of the gaseous exhaust before being compressed into the compressed recycle stream. A purge stream is tapped off from the compressed recycle stream and directed to a C0₂ separator which discharges C0₂ and a nitrogen-rich gas which can be expanded in a gas expander to generate additional mechanical power.

Methods of forming barrier layers and structures thereof are disclosed. A nitrogen rich region is formed at a top surface of a barrier layer by exposing the barrier layer to a nitridation treatment. The nitrogen rich region increases the oxidation resistance of the barrier layer. The barrier layers have improved diffusion barrier properties. A stack of barrier layers may be formed, with one or more of the barrier layers in the stack being exposed to a nitridation treatment.

An oxygen concentrator comprises an oxygen reservoir and adsorbent columns that each have an inlet, an outlet, and a bed of adsorbent material. The concentrator also comprises an air inlet, an exhaust outlet, and a vacuum pump for pumping nitrogen rich gas from one of the column inlets to the exhaust outlet. A product control pump pumps oxygen rich gas from one of the column outlets to the oxygen reservoir. A control valve controls flow in and out of the columns by selectively connecting the air inlet to one column inlet, connecting the vacuum pump to another column inlet, and connecting the product control pump to a column outlet. A motor drives the vacuum pump and control valve to produce vacuum swing adsorption (VSA) cycles in which oxygen-rich product gas is separated and accumulated in the reservoir.

A diffusion barrier film includes a layer of compositionally graded titanium nitride, having a nitrogen-rich portion and a nitrogen-poor portion. The nitrogen-rich portion has a composition of at least about 40% (atomic) N, and resides closer to the dielectric than the nitrogen-poor portion. The nitrogen-poor portion has a composition of less than about 30% (atomic) N (e.g., between about 5-30% N) and resides in contact with the metal, e.g., copper. The diffusion barrier film can also include a layer of titanium residing between the layer of dielectric and the layer of compositionally graded titanium nitride. The layer of titanium is often partially or completely converted to titanium oxide upon contact with a dielectric layer. The barrier film having a compositionally graded titanium nitride layer provides excellent diffusion barrier properties, exhibits good adhesion to copper, and reduces uncontrolled diffusion of titanium into interconnects.

Gas separation membranes and methods for preparing such membranes. The gas separation membranes of the instant invention can separate oxygen and nitrogen in air to provide nitrogen enriched air (NEA), and are stable during exposure to temperatures of at least about 160° C. The gas separation membranes of the instant invention may be formed from polyetherimide by extruding a hollow fiber using a core liquid, quenching the extruded fiber in dry air to promote loss of solvent and non-solvent, and drying the fiber. Methods for separating bleed air fed directly from an aircraft precooler to a high temperature gas separation hollow fiber membrane, to provide NEA, are also disclosed.

A method for increasing oil recovery from an oil reservoir by injection of gas into the reservoir, is described. The method comprises separation of air into an oxygen-rich fraction and a nitrogen-rich fraction, reformation of natural gas together with oxygen to produce a synthesis gas for production of methanol or other oxygenated hydrocarbons or higher hydrocarbons. The raw synthesis products and a waste gas from the synthesis are separated, and the nitrogen-rich fraction and at least a part of the waste gas are injected into the oil reservoir to increase the oil recovery from the reservoir. A plant for performing the method is also described.

The invention provides a cold storage and refrigerating device comprising a gas membrane assembly and a proton exchange membrane assembly. The gas membrane assembly is used for discharging oxygen in air from an air conditioning space, so that nitrogen-rich and oxygen-depleted gas atmosphere in favor of food preservation is obtained in the space, and the aerobic respiration strength of fruits and vegetables in the gas atmosphere is reduced through reducing the oxygen content in the fruit-vegetable storage space; at the same time, the basic respiration is ensured, and the anaerobic respiration of the fruits and vegetables is prevented, so that the purpose of long-term preservation of the fruits and vegetables is achieved. The proton exchange membrane assembly can be used for conveying moisture in the air outside the air conditioning space into the space through electrolytic reaction, and the humidity in the air conditioning space is kept in the proper range all the time. In the cold storage and refrigerating device provided by the invention, the proton exchange membrane assembly and the gas membrane assembly can be used coordinately, in favor of food preservation.

An apparatus for preserving and dispensing wine or champagne. The apparatus provides a housing having a container support for holding wine or champagne bottles, a plurality of removable stoppers for insertion in the bottles, a nitrogen generator for generating a nitrogen rich gas from air, a nitrogen storage tank for storing the generated nitrogen rich gas, a cooling system for cooling certain bottles and dispensers for providing wine or champagne from the bottles to a user. The nitrogen generator draws in ambient air, adsorbs the oxygen from the air and stores nitrogen rich gas in the nitrogen storage tank. The nitrogen storage tank supplies the nitrogen rich gas to the bottles for preserving the wine or champagne. The stoppers include a nitrogen line and a supply line. The nitrogen line communicates nitrogen rich gas into the bottles and the supply line communicates wine or champagne from the bottles to the dispensers.

The invention belongs to the technical field of special functional activated carbon materials, and provides a preparation method of biomass activated carbon rich in nitrogen and oxygen. The method comprises the following specific steps: adding a certain quantity of biomass raw materials into a solution containing nitrogen and alkaline substances; transferring all the substances into a hydrothermal reaction kettle; reacting at a certain temperature for a certain time period; at the end of the reaction, naturally cooling to a room temperature; taking a product out, and drying; performing high-temperature carbonization activation on the dried product in a high-temperature tubular furnace in a protective gas atmosphere for a certain time period; at the end of the reaction, naturally cooling; repeatedly washing the product with water, and drying to obtain a nitrogen-rich biomass activated carbon product. In the biomass activated carbon rich in the nitrogen and the oxygen, prepared with the method, nitrogen and oxygen heteroatoms are introduced, so that the water wetting property and electrolyte ion adsorption performance of a carbon material are enhanced. The method can be widely applied to pollutant treatment, separation of mixtures, electrode materials, and the like, and has a wide application prospect.

A method includes coating a substrate to provide a flame resistant substrate. In an embodiment, the method includes exposing the substrate to a cationic solution to produce a cationic layer deposited on the substrate. The cationic solution comprises cationic materials. The cationic materials comprise a polymer, a colloidal particle, a nanoparticle, a nitrogen-rich molecule, or any combinations thereof. The method further includes exposing the cationic layer to an anionic solution to produce an anionic layer deposited on the cationic layer to produce a layer comprising the anionic layer and the cationic layer. The anionic solution comprises a layerable material.

The invention discloses a sludge-based magnetic nitrogen-doped biochar catalyst and a preparation method thereof, and belongs to the field of sludge resource utilization and the field of environmentalrestoration. The preparation method comprises the following steps: carrying out ultrasonic mixing of concentrated sludge and a certain amount of nitrogen-rich compounds and biomass wastes from urbansewage treatment plants, papermaking sewage treatment plants or industrial park sewage treatment plants, drying, ball-milling, placing the raw materials into a crucible, capping and sealing, and roasting at a high temperature in a muffle furnace to finally prepare the magnetic nitrogen-doped biochar catalyst which has high catalytic activity and high stability and is easy to separate and recycle.The catalyst can be coupled with an oxidizing agent peroxymonosulfate (PMS) to efficiently degrade and even mineralize refractory organic contaminants in a water body. The preparation method providedby the invention has advantages as follows: sources of the raw materials are wide; reaction condition is mild; preparation cost is low; and the preparation method is green and environmentally-friendly. Sludge and biomass wastes from sewage treatment plants that are hard to treat are recycled, and the pollution problem of refractory organic matter in a water body is also solved. The catalyst of theinvention has a broad application prospect in the field of sludge resource utilization and the field of environmental restoration.

The present invention provides a method of rectifying an oxygen, nitrogen and argon containing feed stream that employs high and low pressure columns and an argon column. Refrigeration is imparted through turboexpansion of a nitrogen-rich vapor stream withdrawn from the high pressure column. The nitrogen-rich vapor stream has a sufficiently high flow rate that the flow of both vapor and liquid within the low pressure column is decreased to such an extent that the diameter of the low pressure column can be made substantially equal to or less than that of the high pressure column. The use of the argon column allows recovery of the oxygen to be increased over that which would otherwise be obtained given the draw of the nitrogen-rich vapor. The argon column can be an argon rejection column in which the separated argon is discarded as waste.

The invention provides a refrigerator. The refrigerator comprises a refrigerator body, a storage container and an electrolysis deoxygenization assembly; the electrolysis deoxygenization assembly is used for consuming oxygen in air in storage space, and therefore nitrogen-rich oxygen-depleted gas atmosphere facilitating food freshness is obtained from the space. According to the gas atmosphere, thecontent of oxygen in the storage space is reduced, strength of aerobic respiration of food (specially fruits and vegetables) can be reduced, meanwhile, the foundation respiration effect is ensured, the food is prevented from performing anaerobic respiration, and the aim of long-term freshness of the food can be achieved. The electrolysis deoxygenization assembly is arranged on a back plate of therefrigerator, and the electrolysis deoxygenization assembly is arranged at the position close to an air returning opening. The electrolysis deoxygenization assembly is close to the air returning opening of the refrigerator. Due to the fact that the air returning opening is formed in the hot and cold air intersection position, humidity is large. The electrolysis deoxygenization assembly is arranged at the position, an anode plate facilitates electrolysis of water steam, the electrolysis reaction speed can be increased, and the work efficiency can be improved.

The invention discloses a method for improving biomass and oil accumulation of oleaginous microalgae Scenedesmusdimorphus by adopting a two-stage culture strategy of co-culture and nitrogen deficiency, and belongs to the technical field of microalgae bioenergy. The invention adds a certain concentration of organic carbon source glucose to the autotrophic culture medium, and carries out concurrent culture with CO2 as the autotrophic carbon source. At the same time, under nitrogen-enriched conditions, after high-density culture of microalgae to a stable stage, the algae liquid is transferred to a nitrogen-deficient medium to continue the culture. When the glucose concentration is 1.2-5.4g/L, the initial pH is 7, and the culture time is 14-16 days, the biomass of microalgae can reach up to 4.5g/L, which is 2.57 times the biomass under autotrophic conditions; nitrogen deficiency Under these conditions, the total lipid content of microalgae reaches the highest of 29.62%, which is 1.6 times that of the nitrogen-enriched stage. By adding organic carbon sources and providing nitrogen-deficient conditions for two-stage culture, the biomass of microalgae can be effectively increased and oil accumulation can be promoted, which is of great significance to the research of large-scale production of bioenergy by microalgae.

The invention discloses a nitrogen-rich porous carbon desulfurizer and a preparation method thereof. The desulfurizer comprises a porous carbon material subjected to surface oxidation preprocessing and nitrogen-containing functional groups fixed to the surface of the porous carbon material by soaking and sintering, wherein the mass content of nitrogen element is 0.5-5.0% of the total mass of the nitrogen-rich porous carbon desulfurizer. The preparation method comprises the following steps: soaking the porous carbon material in a strong oxidant solution for surface oxidation preprocessing, mixing the strong oxidant solution with a nitrogen-containing compound solution, fully soaking, evaporating to remove the solvent, drying, putting the dried material into a high-temperature calcining furnace, calcining at the temperature of 400-1000 DEG C under the protection of inert gas, decomposing a nitrogen-containing compound, enabling the nitrogen-containing compound to react with the surface of active carbon, fully calcining, cooling to obtain the nitrogen-rich porous carbon desulfurizer. According to the nitrogen-rich porous carbon desulfurizer prepared by the preparation method, the content of the nitrogen functional groups on the surface of the carbon material is high and the desulfurization capacity is increased by 1.5-2 times in comparison with that of the active carbon desulfurizer which is directly subjected to surface nitrogen modification without surface oxidation preprocessing.

The invention discloses a method for preparing a nitrogen-rich porous carbon material and belongs to the technical field of carbon materials. According to the method, edentate is used as a raw material and subjected to high temperature pyrolysis under the protection of an inert atmosphere and then to pickling and rinsing to obtain the simply prepared nitrogen-rich porous carbon material. The method for preparing the nitrogen-rich porous carbon material is simple and easy to operate. The carbon material is provided with a high nitrogen content and a developed porous structure, the nitrogen content can reach 1.6-15.5%, the specific surface area is 600-2000m<2>/g, the pore volume is 0.3-1.8 cm<3>/g, and the carbon material can be used in fields of electrochemistry energy storage, catalyst carriers, absorption, gas storage and the like.

Method for the rejection of nitrogen from condensed natural gas which comprises (a) introducing the condensed natural gas into a distillation column at a first location therein, withdrawing a nitrogen-enriched overhead vapor stream from the distillation column, and withdrawing a purified liquefied natural gas stream from the bottom of the column; (b) introducing a cold reflux stream into the distillation column at a second location above the first location, wherein the refrigeration to provide the cold reflux stream is obtained by compressing and work expanding a refrigerant stream comprising nitrogen; and (c) either (1) cooling the purified liquefied natural gas stream or cooling the condensed natural gas stream or (2) cooling both the purified liquefied natural gas stream and the condensed natural gas stream, wherein refrigeration for (1) or (2) is obtained by compressing and work expanding the refrigerant stream comprising nitrogen. The refrigerant stream may comprise all or a portion of the nitrogen-rich vapor stream from the distillation column.

The invention discloses a long-acting nitrogen-rich rice special organic fertilizer prepared from the following raw materials by weight: 10-16 parts of urea, 1-2 parts of bentonite, 15-20 parts of pig blood powder, 25-35 parts of sweet potato vine, 5-7 parts of fig leaf powder, 12-16 parts of sugar residue, 6-8 parts of distiller's grains, 5-7 parts of calcium superphosphate, 0.1-0.2 part of urease inhibitor, 8-10 parts of coffee slag, 15-20 parts of buffalo milk powder, 5-6 parts of potassium sulfate, 4-5 parts of silicon sulfate, 4-5 parts of potassium dihydrogen phosphate, 20-30 parts of a soil conditioner, and proper amount of water; compared with traditional fertilizers, the use mount of the organic fertilizer is greatly reduced, by addition of the sweet potato vine, the pig blood powder, the buffalo milk powder and other organic matters with rich nutrient elements, soil can be improved effectively improved and fattened, soil organic matter content is increased, the added urease inhibitor slows hydrolysis of tillering stage urea, ammonium nitrogen content in booting stage soil is improved, and the organic fertilizer provides adequate nitrogen fertilizer for later stage growth of rice.