62 results about "Residual nitrogen" patented technology

A method of scrubbing mercury compounds and nitrogen oxides from a gas stream employing a scrubbing operation. The method involves the contact of the stream which contains mercury, SO_x and NO_x compounds with a sorbent to remove at least a portion of the latter compounds. This results in a partially cleaned stream. The method further involves contacting the latter stream with an oxidant to oxidize and remove substantially all residual nitrogen oxides, mercury and mercury compounds remaining in the stream.

Systems and methods of removing at least nitrogen oxides from an exhaust fluid generally include introducing a first reducing agent and a hydrogen gas co-reductant agent into the exhaust fluid upstream of a catalyst bed optimized for a hydrocarbon selective catalytic reduction process to reduce nitrogen oxides present in the exhaust fluid and then reacting residual nitrogen oxides in a second catalytic bed optimized for an ammonia selective catalytic reduction process. The use of hydrogen gas permits efficient reduction of nitrogen oxides over a wide temperature range, which is minimally affected by the presence of sulfur dioxide in the exhaust fluid.

The invention discloses a treatment method of chemical nickel phosphor plating waste liquid, and relates to the comprehensive recovery and utilization field of chemical plating waste liquid. Under the condition of not adding any catalysts such as Pt salt and the like, and without external heating, the method utilizes sodium hydroxide dissolution, heat produced in the process of neutralization reaction and local high temperatures between liquid-solid interfaces, high pH value, and NaOH, and is induced by crystal nucleus provided by Ni2, therefore, the waste liquid is impelled to carry out self decomposition, and Ni-P alloy solid particles are generated. Under the action of the self decomposition of the Ni-P alloy solid particles, the waster liquid is decomposed quickly and completely, nickel is transformed into Ni-P alloy and then settled and separated out. More than 96 percent of nitrogen is transformed into ammonia, and phosphor, residual nitrogen, and majorities of organic acid are transformed into magnesium salt and calcium salt compound fertilizer. After the recycled nickel and phosphor resources are subjected to comprehensive recovery treatment, the nickel and the nitrogen contained in the waste liquid reach the national first-level discharge standard, and the phosphor and COD reach the national third-level discharge standard.

This Personal Respirator is a respiratory protection air-purifying device that minimizes the area required in front of the face, especially around the mouth area, by locating the very lightweight filter and plenum close to the head, connected by a airway tube forming a complete unit with the mouthpiece in the mouth, supported by the mouth. The airway tube and the filter plenum are both of minimal internal area and close to the mouthpiece, thus minimizing the internal volume of used air, residual nitrogen, and making the outside dimensions small enough to be compatible with most safety equipment. The respirator requires no straps and is preferably provided with a small tether to the nose clip and is worn in front of the head with the mouthpiece inserted into the mouth, the filter then supported by the mouth, and the nose clip secured on the nose.

The invention discloses a method for recycling a mother liquor during the production of iron phosphate. The method comprises the following steps: firstly, adding iron phosphate reaction raw material liquid and H2O2 into a reaction kettle to synthesize iron phosphate; performing synthesis reaction and slurry pressing and filtration to obtain slurry and mother liquor of iron phosphate; then recovering phosphorus and ammonium in the mother liquor in the form of iron phosphate filter cakes and monoammonium phosphate solution, respectively; reusing all the recovered materials in an iron phosphate synthesizing step. The method provided by the invention regenerates and recycles the mother liquor generated during the preparation of iron phosphate, can make full use of residual nitrogen, phosphorus and other useful components in the mother liquor, avoids waste of resources, and greatly reduces comprehensives cost and matched environmental protection costs for the production of iron phosphate.

The invention discloses a flue-cured tobacco cultivation method capable of effectively controlling high-nitrogen soil fertility. The cultivation method comprises the following steps: A. before transplantation, making a pond in a tobacco field, and applying a phosphate fertilizer in the pond; B. during the transplantation, applying an organic magnesium potassium sulfate fertilizer, an organic induced disease-resistant agent, a microbial inoculant and biochar into the pond, and after finishing the transplantation, applying well-rotted farmyard manure and covering the pond; C. 10-15 days after the transplantation, applying an all-water-soluble organic fertilizer solution in the pond; D. 40-60 days after the transplantation, spraying an organic potassium fertilizer and a boron zinc molybdenum fertilizer; and E. 55-60 days after the transplantation, carrying out tip pruning on the tobacco plants. The method is simple to operate, and is capable of effectively controlling the high-nitrogen soil fertility and lowering the residual nitrogen element in the high-nitrogen soil. The first batch of nitrogen element which can be easily decomposed in the soil is firstly released, thereby satisfying the demands of early growth and quick tillering of the transplanted tobacco plants. Meanwhile, the method can effectively control the phenomena of regreening and excessive vegetative growth in the tobacco plants.

The invention discloses a water-saving and pollution-reducing method for irrigation and drainage coupled water circulation use in a flat ecological irrigation district, wherein an irrigation district drainage period and an irrigation district water need period are comprised; during the irrigation district drainage period, field drained water enters a cyclically-adjusting wetland reservoir through a drainage ditch, sediments, pesticides and heavy-metal harmful substances are intercepted and purified through a submerged plant zone and an ecological wetland purification island system, and nitrogen and phosphorus nutrient substances are treated, thus reducing the harms of drainage to the water bodies of rivers and lakes; during the irrigation district water need period, water bodies in the cyclically-adjusting wetland reservoir are extracted by a water extraction pump and distributed to irrigation district farmlands, thus increasing the utilization efficiency of water resources, wherein the residual nitrogen and phosphorus nutrient substances can also be needed by the growth parts of crops. The water-saving and pollution-reducing method disclosed by the invention has the advantages of coupling irrigation and drainage processes in the ecological irrigation district, reducing the influences caused by the drainage of farmland surface source pollutants on rivers and lakes, increasing the utilization efficiency of water resources and chemical fertilizers, and realizing the sustainable development of the ecological water-saving irrigation district agriculture.

The invention relates to a method for manufacturing an isolation structure of an LDMOS, comprising the steps of: forming a first trench on a wafer surface; Filling the first trench with silicon oxide;Removing a portion of the silicon oxide surface in the first trench by etching; Forming a silicon oxide corner structure at a corner at the top of the first trench by thermal oxidation; Depositing anitrogen-containing compound on the wafer surface to cover the silicon oxide surface and the silicon oxide corner structure surface in the first trench; Dry etching the nitrogen-containing compound toremove the nitrogen-containing compound on the silicon oxide surface in the first trench to form the nitrogen-containing compound sidewall residue; A second trench is formed by further etching downward with the residual nitrogen-containing compound sidewall as a mask. The second trench is formed by etching downward with the nitrogen-containing compound sidewall as a mask. Forming a silicon oxidelayer on the sidewalls and bottom of the second trench; Removing the residue of nitrogenous compound sidewall; The first trench and the second trench are filled with silicon oxide. The invention can improve the breakdown voltage and save the lithographic plate.

The invention discloses a natural particle size soil nitrogen grading method which particularly includes the steps: 1) extracting FN (free nitrogen) in soil samples by the aid of deionized water; 2) extracting IEN (ion exchange nitrogen) in the soil samples by the aid of KCl (kalium chlorate); 3) respectively extracting CN (carbonate combined nitrogen) and IMON (iron and manganese oxide nitrogen) in the soil samples by the aid of acetate-acetate buffer solution and NaOH (sodium hydroxide); 4) extracting HN (acid hydrolysis nitrogen) the soil samples by the aid of HCl (hydrochloric acid); 5) measuring RN (residual nitrogen) by the aid of an alkaline potassium persulfate digestion-ultraviolet spectrophotometer method. According to the method, grading of nitrogen in the soil is refined under the natural particle size, more scientific and comprehensive grading is achieved, grading accuracy and grading reliability are ensured by the aid of section of different chemical extracting agents and extracting orders.

The invention discloses a crop planting method, specifically a field fertilization method for planting carrot. The applied fertilizer comprises: nitrogen fertilizer N: 180-250kg/hectare, phosphorus fertilizer P2O5: 120-180kg/hectare, potassium fertilizer K2O: 120-180kg/hectare, artificial manure 20000kg/hectare as basal fertilizer. The phosphorus fertilizer and the artificial manure are applied as basal fertilizer before sowing seeds and 50% of nitrogen fertilizer and potassium fertilizer are applied as basal fertilizer; and the residual nitrogen fertilizer and the potassium fertilizer are applied as additional fertilizer for two times. The carrot has suitable water content with soft and sweet taste and the yield is increased.

The invention relates to a high-concentration oxygen generating plant, in particular to a high-concentration medical oxygen generating plant with molecular sieves, comprising a dehydrating device, an oxygen adsorbing device and a carbon adsorbing device which are sequentially serially connected. The oxygen adsorbing device comprises two carbon molecular sieve adsorption columns connected in parallel, a gas tank and a vacuum pump, and the carbon adsorbing device comprises two oxygen molecular sieve adsorption columns connected in parallel, a gas tank and a vacuum pump. The high-concentration medical oxygen generating plant with the molecular sieve adsorption columns adopts the heatless automatic regeneration molecular sieve technology to remove water and harmful gases, such as carbon dioxide, sulfur dioxide and the like, in air. Nitrogen and argon are removed by means of preferentially adsorbing oxygen by the aid of carbon molecular sieves, residual nitrogen is removed by oxygen molecular sieves, and accordingly concentration of the oxygen can reach 99.99% at least. Product oxygen is not used as regeneration gas for realizing vacuum pressure swing adsorption, accordingly, oxygen recycling rate is improved, the service life of the high-concentration oxygen generating plant is prolonged, and the high-concentration oxygen generating plant can be widely used for fields such as industry, hospitals, national defense construction and the like.

Integrated process for the synthesis of ammonia and nitric acid, comprising a synthesis of nitric acid including the following steps: a) subjecting a stream of ammonia (10) to catalytic oxidation, obtaining a gaseous stream containing nitrogen oxides (13); b) subjecting said gaseous stream to a process of absorption of nitrogen oxides, providing nitric acid (16) and a tail gas (17) containing nitrogen and residual nitrogen oxides; c) subjecting at least a portion of said first tail gas (17) to a process of removal of nitrogen oxides, providing a nitrogen oxides-depleted tail gas (18), and comprising a synthesis of ammonia by catalytic conversion of a make-up gas (126, 226) comprising hydrogen and nitrogen in an ammonia synthesis loop, wherein at least a portion (18b, 18d, 21) of said second tail gas is used as nitrogen source for obtaining said make-up gas (126, 226).

The present invention relates to systems and methods for administering high concentrations of nitric oxide (NO) gas to a patient without the need to provide supplemental oxygen to the patient. The systems and methods can be used to administer high therapeutic amounts of NO gas, for example a gas comprising 160 ppm NO, while forming little or no residual nitrogen dioxide (NO₂). The method is based on using a NO gas source with a relatively high NO concentration, for example 5,000 ppm, while rapidly mixing the gas from the NO gas source with air immediately prior to administering the gas to a patient.

The invention provides a method for processing tail gas produced by nitric acid. The method comprises the following steps: adjusting temperature of tail gas to a suitable scope between 25 and 35 DEG C for microbe growth, introducing the tail gas in a paracoccus nutrient solution, using denitrification of the paracoccus for reducing nitrate, nitrite and a nitrogen oxide in the tail gas to nitrogen, introducing the tail gas into a chlorella nutrient solution, using photosynthesis of chlorella for absorption and fixing of carbon dioxide, absorbing residual nitrogen oxide, and taking the residual nitrogen oxide as a nitrogen source for algae growth, wherein gas from two-step biological treatment is mixed with partial microbe spittle, so that the method connects water pipes in series and the microbe in gas can be diluted and absorbed with a certain degree, and finally discharging the gas to atmosphere after water absorption by calcium chloride. The biological treatment method has the advantages of cleaning and environmental protection, and is capable of processing exhaust gas and promoting thalline growth, the obtained paracoccus can be used as a feed, the chlorella can be used for processing biodiesel, and has prominent economic value.

The present invention discloses an apparatus for recovering and processing isobutyraldehyde tail gas of storage tanks. A nitrogen tank (1) is communicated with a storage tank (3) through a gas pipeline I (5). The storage tank (3) is communicated with a reactor tank (8) through a gas pipeline II (6). A nitrogen valve (2) and a one-way valve (4) are disposed on the gas pipeline I (5) and the gas pipeline II (6). The reactor tank (8) is communicated with a water tank (9) through a gas pipeline III (7). The present invention also provides a method for recovering and processing, including: firstly, replenishing nitrogen to the storage tank (3) for storing isobutyraldehyde to make the nitrogen float on the liquid to form a nitrogen sealing; and secondly, discharging the mixed gas containing nitrogen and isobutyraldehyde tail gas in the reaction tank (8) into a methanol solution in the reactor tank (8) through an exhaust nozzle (11). The isobutyraldehyde tail gas in the mixed gas is adsorbed and dissolved by the methanol solution, and the residual nitrogen after floating is discharged into the water tank (9) for collection through the gas pipeline III (7).

The invention relates to a method for manufacturing a stacked polysilicon gate structure of a semiconductor device, comprising the steps of: forming a trench on a wafer surface; Filling the trench with silicon oxide by deposition; Part of the silicon oxide is etched back; Forming a corner structure at a corner of the top of the groove; Deposition of nitrogenous compounds; Dry etching nitrogen-containing compound, the corner structure surface forms nitrogen-containing compound sidewall residue extending into the groove; A part of silicon oxide is etched off by using the residual nitrogen-containing compound sidewall as a mask; Repeating the above three steps in turn until the silicon oxide in the trench is etched to the desired bottom silicon oxide thickness; Removing nitrogen compounds inthe trench; Filling polysilicon into the trench; Forming an isolated silicon oxide on the polysilicon; The above two steps are repeatedly performed to form a multilayer polysilicon and a silicon oxideisolation. The invention adopts the method of deposition and step etching to form the silicon oxide in the trench, which reduces the oxidation time and improves the production efficiency.

The invention discloses a method for improving secondary salinization of soil in facility cultivation, which comprises the following steps of: selecting a test plot, planting protection rows around the test plot, sowing plants and fertilizing in the test plot by adopting a drill sowing mode, wherein the seeding amount is 250-350kg/hm<2 >, irrigation is carried out until the soil is moist, a film is paved and moistened, the film is removed after the seeds sprout and come out of the soil, the seedlings are mowed after reaching 30-40cm, during the whole production period, the seedlings are mowedfor 6-8 times, no topdressing is carried out after each mowing, and the whole production period does not control plant diseases and insect pests; and the fertilizer for fertilizing is a microbial bacterial fertilizer or a rice chaff fungus matrix fertilizer. The method for improving the secondary salinization of the soil in the facility cultivation can obviously improve the pH value and CEC valueof the soil, can improve the fertilizer conservation effect of the soil and reduce the nitrate content in the soil; by planting the water spinach, the residual nitrogen in the soil can be reduced, andthe purposes of reducing the salt content of the soil and relieving the secondary salinization of the soil can be achieved.

The invention provides a large-scale energy-saving gradient air separation process. Pressurized air which is dried and removed from carbon dioxide previously is subjected to adsorption separation by aradial zeolite molecular sieve pressure-swing absorber, causing the nitrogen to be adsorbed by the zeolite molecular sieve and 50%-85% of oxygen-enriched air to flow out of the zeolite molecular sieve pressure-swing absorber. The zeolite molecular sieve pressure-swing absorber is switched by a sequencing valve to deliver or discharge the high-purity nitrogen as a product after reduced pressure desorption thereof, and the zeolite molecular sieve pressure-swing absorber is reused. The oxygen-enriched air flowing out of the zeolite molecular sieve pressure-swing absorber is subjected to adsorption separation in a carbon molecular sieve pressure-swing absorber, causing the oxygen to be absorbed by the carbon molecular sieve and the residual nitrogen, argon, helium and the like to be discharged out of the carbon molecular sieve pressure-swing absorber; the carbon molecular sieve pressure-swing absorber is switched by the sequencing valve to discharge the high-purity oxygen as a product after reduced pressure desorption thereof, and the carbon molecular sieve pressure-swing absorber is reused.