92 results about "Nitrogen gas" patented technology

A system and method for separating air into components uses an air dehydration membrane for removing water vapor from compressed air. Dried compressed air is then directed, from the dehydration membrane, into a gas separation module which may be a membrane system, different from the air dehydration membrane, or a pressure swing adsorption (PSA) system. The air dehydration membrane is made of a hydrophilic polymer having a permeability for water vapor which is greater than its permeability for air, and having low selectivity between oxygen and nitrogen. The air dehydration membrane has a hydrophilic coating, which itself may be a polymer. The coating does not affect the selectivity of the coated dehydration membrane with respect to oxygen and nitrogen, but does increase selectivity of the membrane with respect to water vapor.

The invention discloses a directional pyrolysis method of combustible wastes. The method comprises the following steps: putting the combustible wastes into a pyrolysis furnace; carrying out air replacement on the pyrolysis furnace, namely feeding nitrogen into the pyrolysis furnace and discharging air from the pyrolysis furnace; maintaining the nitrogen pressure in the pyrolysis furnace within 0.05MPa to 0.1MPa; starting the heating to enter pyrolysis states, namely entering different pyrolysis steps according to different pyrolysis demands for the combustible wastes, wherein the different pyrolysis demands comprise the following steps: obtaining pyrolytic carbon of the combustible wastes, obtaining a pyrolytic tar of the combustible wastes and obtaining a pyrolytic combustible gas of the combustible wastes. According to the method, the combustible wastes are directionally pyrolyzed into the organic carbon, the high-calorific-value gas and the tar by regulating the pyrolysis temperature, the pyrolysis pressure, the heating rate and the catalyst adding mode through the utilization of calorific values of the combustible wastes, so that the utilization rate of the combustible solid wastes is greatly improved; the air is isolated, so that the combustion of the carbon and the volatilization of heavy metals and chlorine are reduced. Thus, the discharge of dioxin is below 0.1ng/Nm<3>.

The invention relates to a catalyst for ternary copolymerization of norbornenes, tetrafluoroethylene and pentenes and a ternary copolymerization method. The catalyst is characterized in that the catalyst is prepared through the following method comprising the steps of: dissolving iron dichloride, a ligand and an alkyl metal compound in a solvent in a dry single-neck glass bottle in an inert gas atmosphere, sealing a bottle mouth through an emulsion pipe, keeping the constant temperature in a water bath at the temperature of 40-50 DEG C for 10-30min, and cooling to obtain an iron complex catalyst. Compared with the prior art, the catalyst provided by the invention is a novel iron complex catalyst which can produce catalytic activity in an nitrogen-protected system at a certain pressure and the temperature of 20-120 DEG C so as to catalyze the ternary copolymerization of the norbornenes with the tetrafluoroethylene and the pentenes, and a product after soaking in methanol is very easy to wash and separate. The catalyst has the characteristics of high copolymer yield, low reaction temperature, low price, easiness in obtainment, high catalytic efficiency and the like.

A fluorescent material comprising: a β-Sialon expressed by the general formula Si_6-ZAl_ZO_ZN_8-Z as a host material; and Eu dissolved in solid solution as a luminescence center, is a powder which, when measured by the laser diffraction scattering method, gives particle diameter distribution in which cumulative 10% diameter (D₁₀) falls within the 7 μm to 20 μm range and 90% diameter (D₉₀) within the 50 μm to 90 μm range, and can be used as a fluorescent material low in luminescence intensity degradation ideal for illuminators. This fluorescent material can be produced by subjecting a raw powder, which is obtained by mixing a silicon nitride powder, aluminum nitride powder, and aluminum-containing or Eu-containing compound as required, to heating at 1850° C. to 2050° C. for 9 hours or longer in a nitrogen or nonoxidizing atmosphere.

The invention discloses a phosphor-silicon-containing aggregated flame retardant and a preparation method thereof. The preparation method comprises the following steps: adding 10-(2,5-dihydroxy phenyl)-9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and an acid-binding agent into a reactor loaded with a burette, a condensing tube and a nitrogen protection device, heating to 40 to 100 DEG C; weighing R1, R2-dichlorosilane, adding a solvent, and adding the mixture into the burette; adding the mixture at the temperature of 40 to 100 DEG C dropwise, and performing a thermal reaction for 2 to 10 hours after finishing of dropping; adding a precipitant, performing suction filtration, washing filter cakes with the precipitant, and drying to obtain the phosphor-silicon-containing aggregated flame retardant. The phosphor-silicon-containing aggregated flame retardant has high phosphor content and silicon content, abundant carbon sources, high char forming characteristic, superior flame retardance and thermal stability, and can be applied to high-molecular materials such as flame-retardant polypropylene, polystyrene and epoxy resin.

The invention discloses a carbonization cleaning process of a carbonizer for producing heavy soda ash, particularly aiming at a carbonization cleaning process of an outside cool tower for producing heavy soda ash, characterized by: using marshalling operation, using one tower for cleaning, using the other three towers for producing soda, and washing the towers with an ammonia mother liquor II by turns; sending the ammonia mother liquor II in a cleaning tower, letting a mixed gas of carbon dioxide and nitrogen in the cleaning tower, dissolving sodium bicarbonate and ammonium bicarbonate and other scabs in the tower with the ammonia mother liquor II, and simultaneously reacting ammonia in the ammonia mother liquor II with carbon dioxide to achieve the purposes of carbon dioxide absorption and then precarbonization. According to the invention, because of no need of letting the hot ammonia mother liquor II be subject to cooling and then enter in the soda production tower, the carbonization conversion degree is effectively raised, and the carbonization cleaning process disclosed herein is beneficial for cleaning the carbonizer.

The invention discloses a coal seam anti-reflection method for circular damage by using cold shock of liquid nitrogen and phase change gas. First, a layer penetrating drill hole is drilled in a roadway to a coal seam through a rock layer; in the layer penetrating drill hole, the coal seam is cut to form multiple cracks perpendicular to the layer penetrating drill hole; a liquid nitrogen injectingpipe and an exhaust pipe extend into the layer penetrating drill hole; and the exhaust pipe is connected with two gas pipelines separately provided with a safety valve and a spherical valve. The spherical valve performs the on-off control over the emission of nitrogen when the liquid nitrogen is injected in the layer penetrating drill hole; after the spherical valve is closed, a threshold of the safety valve is set, so that the safety valve controls the pressure in the layer penetrating drill hole; and after the air pressure in the layer penetrating drill hole exceeds the threshold each time,the safety valve is opened to discharge internal nitrogen for pressure relief, and the safety valve is automatically closed after the pressure relief. The method can guarantee that the liquid nitrogenis quickly and continuously injected in the layer penetrating drill hole, and meanwhile, cracks of coal masses are caused by using cold shock of the liquid nitrogen, the expansion pressure of the phase change gas and the frost heaving pressure of water in the cracks to effectively guarantee the anti-reflection effect.

The invention provides a preparation method of a corrosion inhibitor of methanol gasoline, and belongs to the technical field of metal corrosion protection. The preparation method comprises steps as follows: alpha-methylstyrene dimer, maleic anhydride, dicumyl peroxide and dimethylbenzene are added into a reactor, and then, the mixture is heated in an atmosphere of nitrogen for reacting; after the mixture is cooled to the room temperature, octadecanol, polyethylene glycol, p-toluenesulfonic acid, n-butyl alcohol and ethyl acetate are added, the mixture is heated for reacting and then cooled to the room temperature, and a mixture I is obtained; the mixture I is washed with a sulfuric acid aqueous solution, then washed with an NaOH aqueous solution and finally washed with an aqueous solution, and a mixture II is obtained; and benzotriazole, 2, 6-tert-butyl-4-methyl phenol, hexamethylene tetramine, ethanol, propargyl alcohol, trimellitate, a surface active agent and a combustion improver are added into the mixture II and uniformly stirred, and the corrosion inhibitor is obtained. The provided methanol gasoline has good solubility with various oils, the additive amount is small, and the corrosion-resistant effect is superior to that of a similar product.

The invention relates to a method for preparing a chloroprene rubber adhesive agent. The current products contain a large amount of methylbenzene and are poisonous. The invention comprises the following steps: firstly adding the chloroprene rubber and chlorinated polyethylene into a mixed solution (the compositions are 120# solvent oil, acetic ether, butanone, acetone and methyl carbonate) and mixing; after being entirely dissolved, filling nitrogen into the reactor; then adding methyl methacrylate and vinyl acetate and heating up to 80-100 DEG C; adding benzoyl peroxide to initiate a polymerization reaction; after 2-3 hours of the polymerization reaction, adding acroleic acid and adding additional benzoyl peroxide to continue reacting for 1-2 hours; after that, stopping the filling of the nitrogen and cooling to 30-50 DEG C; then adding 2,6-ditertiary butyl-p-cresol, mixing and discharging to obtain the chloroprene rubber adhesive agent. Therefore, the chloroprene rubber adhesive agent prepared by the method of the invention is environmental-friendly and has higher bonding strength to EVA soles. The method has the advantages of simple process and can realize large-scale production.

The invention relates to a gallium nitride semiconductor film, a gallium nitride-based light emitting dioxide and a corresponding preparation method therefor. The preparation method for the gallium nitride semiconductor film comprises the following steps of: bombarding a gallium-containing target and a substrate by using double ion sources, respectively, and filling the primary ion source with argon to generate argon ion beams to bombard the gallium-containing target and generate sputtering particles which are deposited on the substrate; and filling the secondary ion source with ammonia or nitrogen to generate nitrogen ions to bombard the surface of the substrate, wherein the nitrogen ions are combined with the sputtering particles deposited on the surface of the substrate to generate the gallium nitride semiconductor film. According to the invention, the primary ion source generates the argon ions to bombard the gallium-containing target and the nitrogen ions generated by the secondary ion source generate gallium nitride by virtue of a chemical reaction, and the nitrogen ions are directly supplemented to the surface of the substrate by way of shallow injection, so that the content of element nitrogen in the gallium nitride semiconductor film can be effectively improved, and the proportioning error of the element nitrogen and the element gallium is overcome, and the prepared thin is uniform in thickness and high in precision.

A method for anaerobic digestion of easily acidified wastewater (substance) to produce methane comprises the following steps: (1) directly adding the easily acidified wastewater into a fully mixed anaerobic digestion reactor as a fermentation substrate; (2) adding the inoculum into a fully mixed anaerobic digestion reactor; (3) adding granular activated carbon into a fully mix anaerobic digestionreactor; (4) carrying out anaerobic digestion reaction, and before that reaction proceeds, introducing nitrogen gas into the reactor to ensure that there is no oxygen in the system; Then at the speedof 100r/min and the temperature of 30-50 DEG C, carrying out reation. During the process of the reaction, the pH value does not need to be adjusted, and the time of anaerobic digestion is controlled to be 5-20 days. Methanogenesis of easily acidified wastewater (substance) was realized by adding granular activated carbon into digested substrate, which was produced in food processing industry, vegetable processing industry and catering industry, and then the acidified wastewater (substance) was digested.

The invention relates to an improved Orsat gas analyzer and an analysis method thereof. A 1901 type Orsat gas analyzer is used as the basis, a set of gas absorption tubes are disassembled, a burner replaces the gas absorption tubes, and a lighting lamp is added. In accordance with some theoretic and the practical situations such as explosion limit of hydrogen in air, combustible gas residual safe concentration, analysis sampling requirement, dynamical changed hydrogen content and practical analysis experience, a hydrogen content and practical sample amount experience comparison table and a corresponding operating method are independently compiled, so as to keep the advantages of the 1901 type Orsat gas analyzer that: the size is small, the analyzer is conveniently carried over and satisfies the analysis requirement for oxygen and carbon dioxide content, and the analyzer movably analyses on multi points in the light-insufficient outer production environment such as at night, and realizes the advantages of convenience in operation of the content value of the dynamically changed hydrogen in the hydrogen system replacement, continuous analysis during the whole process, short replacement qualified time, reduced use cost of the pure nitrogen gas and low working strength of the analyzer.

The invention relates to a method for analyzing aroma components of a flavoring material through GC/MS based on thermal desorption. The method includes the following steps that 1, a sample to be extracted is put into a thermal desorption device, the thermal desorption device is placed in a water bath with the temperature of 50-70 DEG C, magnetic stirring is carried out, meanwhile nitrogen purging is carried out, the aroma components are captured for 50-70 min through a thermal desorption pipe, desorption is carried out for 5-30 min at 240-260 DEG C at a gas chromatography sample inlet, and the aroma components of the flavoring material are obtained; 2, gas chromatography-mass spectrometry analysis is carried out on the obtained aroma components. By means of the method, extraction and analysis of trace compounds in essence are greatly improved, and a great breakthrough is made in both the variety and the quantity of the compounds. By means of a device used in the method, some volatile trace aroma compounds in pasty or oily or solid essence can be well detected. The new enrichment and analysis method is provided for detecting some trace flavoring materials in food.

The invention relates to a method for keeping quality stability of clindamycin phosphate injection. The method is characterized by comprising the following steps of: (1) adding an antioxidant in an amount which accounts for 0.05 to 4 percent of the total mass of the clindamycin phosphate injection into the prepared clindamycin phosphate injection and fully stirring to dissolve the antioxidant; and (2) introducing nitrogen gas into the solution at the flow velocity of 2ml/minute for 10 to 20 minutes and sealing the injection, wherein the antioxidant is sodium sulfite. Because a certain amount of antioxidant is added into the clindamycin phosphate injection, clindamycin phosphate can be protected from being oxidized; and because the nitrogen gas is introduced into the clindamycin phosphate injection to replace oxygen in the solution, the clindamycin phosphate is protected from being oxidized; therefore, the clindamycin phosphate has stable quality in the solution and is difficult to degrade and oxidize; and the medication safety of the clindamycin phosphate is improved. The method is easy to operate, has low cost and contributes to wide popularization.

The invention discloses a method for efficiently producing chlorinated graphene. The method comprises the following steps that graphene powder is heated, so that a part of moisture is removed, vacuumizing is conducted until moisture of the graphene powder is completely removed, and the graphene powder continues to be heated; the graphene powder and chlorine react at a certain temperature, and a chlorinated graphene powder material is obtained; the chlorinated graphene powder material is treated with nitrogen, free chlorine adsorbed on the surface of the chlorinated graphene powder is removed, and pure chlorinated graphene powder is obtained. Negative electricity exists among the chlorinated graphene powder prepared according to the method due to the action of a chlorine functional group, and the chlorinated graphene powder is fluffier and easier to scatter in use due to the action that like charges repel; in addition, the number of steps of the preparation method is small, the productivity is high, the technology is simple, and large-scale industrial production is easy to achieve.

The invention discloses a device and a method for storing strong fragrant vegetable oil. The device and the method have the advantages that a nitrogen closed circulating storing device is provided, and a gas phase closed circulation manner is adopted to conduct nitrogen-filled storage on the strong fragrant vegetable oil, so that flavor components in the strong fragrant vegetable oil can achieve a balance between an oil phase and a gas phase to form a reversible state, the phenomenon that the flavor components in the strong fragrant vegetable oil are discharged from a breather valve, which is caused by gas replacement or gas emptying, is effectively avoided, the problem that the strong fragrant vegetable oil volatilizes and attenuates easily during the storing process is solved really, and the quality of the vegetable oil is improved.

Production of SiALONC by silicon oil containing hydrogen and Al powder and its production are disclosed. The SiALONC ceramic consists of silicon oil containing hydrogen 18-55wt%, amino compound 43-70wt%, Al powder 2-22wt%. The production is carried out by: 1) mixing silicon oil containing hydrogen 18-55wt%, amino compound 43-70wt% with Al powder 2-22wt%, agitating under 0-100deg.C for 8-12hrs, and reacting to form Si-Al-O-N-C organic polymer; 2) inducing nitrogen with 0.5-1atmos into organic polymer in heat pressure sintering furnace, pressurizing 15-20Mpa, or inducing nitrogen with 0.5-1atmos into atmospheric pressure furnace under sintering temperature 1600-1750deg.C, keeping temperature for 1-2hrs, and sintering Si-Al-O-N-C ceramic. It achieves low cost and high strength.

The present invention belongs to the technical field of food processing and more particularly relates to a preparation method of fruit and vegetable crisp slices. The preparation method comprises the following steps: (1) materials are selected, the selected materials are washed, and the washed fruits and vegetables are cut into thin slices or long strips according to processing characteristics; (2) the fruit and vegetable thin slices or long strips are cooled step by step and the cooled fruits and vegetables are drained for a standby application; (3) the central temperature of the obtained fruits and vegetables is reduced to -18 to -20 DEG C in 15 min; (4) cooled fruits and vegetables are soaked in a maltose dilution for 12 hours, the soaked fruits and vegetables are placed in a vacuum oil-frying device, a vacuum pumping is conducted, nitrogen is filled, and then palm oil is heated to be 85-88 DEG C; and (5) the fruits and vegetables are transferred away from oil surface, the vacuum pumping continues, the oil removing treatment is kept, the materials are discharged, and then the fruits and vegetables are seasoned to obtain fruit and vegetable crisp slices. The obtained crisp slice products are crisp in mouthfeel, the preparation method keeps purely natural color and luster, nutrition and flavor of the fresh fruits and vegetables, the products are free of greasy feeling, and the preparation method does not produce carcinogens of 3-4 benzoapyrene, acrylamide, etc.

The invention relates to an ice temperature gas conditioning and coupling compound antioxidant multiple-factor fence preservation technology of cooked beef, belonging to the technical field of meat preservation. The method comprises the steps of soaking the beef into a mixed solution containing 0.25-0.75% of tert-butyl hydroquinone (TBHQ), 10.75-20.75mg/ L of tea polyphenol and a flavoring agent, cooking thoroughly, cooling and then putting the cooked beef into a food preservation box; vacuumizing, and charging 60-80% of oxygen, 10-30% of nitrogen and 10% of CO2; sealing the box by using a high-barrier compound packaging film which is made of polyethylene terephthalate (PET)/ chlorinated polypropylene (CPP) material and has the thickness of 0.062mm, and preserving at the temperature of 0-1 DEG C. Therefore, the aims of good preservation effect, low cost, good flavor and long preservation time are achieved.

The invention discloses a method of purifying perfluoromethyl cyclohexane. The method comprises the following steps of: (1) neutralizing a perfluoromethyl cyclohexane crude product prepared by an electrofluorination method with aqueous alkali till an upper water phase is neutral, standing for liquid separation, and transferring a lower layer organic phase to a distillation kettle, (2) performing simple distillation, (3) performing extraction, (4) performing deep fluorination: supplying fluorine and nitrogen gas mixture into components after extraction for reaction for 0.5-10h at -20-10 DEG C, supplying nitrogen to purge and replace the gas mixture, (5) performing alkali disliquid: transferring fluorinated perfluoromethyl cyclohexane into a reaction kettle, adding an alcohol-alkali-water solution at a mass ratio of 1:1:1 into the reaction kettle, performing reflux for 10h, taking and drying the lower layer organic phase, (6) performing rectification, and (7) performing multistage adsorption-desorption. The method is suitable for purifying the perfluoromethyl cyclohexane crude product prepared by the electrofluorination method, simple in flow and easy to operate; industrial production is easy to realize; the purity of a prepared product reaches 99.9% or above.

The invention relates to an efficient and energy-saving BOG (boil-off gas) recycling device which comprises a nitrogen gas storage tank, a first control valve, a nitrogen gas compressor, a nitrogen gas water cooler, a water tank, a pump, a second control valve, an expander, a third control valve, a heat exchanger I, a fourth control valve, a fifth control valve, a sixth control valve, a heat exchanger II, a seventh control valve, an eighth control valve, an LNG (liquefied natural gas) storage bottle, a weigher and a ninth control valve. According to the efficient and energy-saving BOG recycling device, a common oil-free nitrogen gas compressor and a turbo expander are adopted, low-temperature nitrogen is adopted as a heat transfer medium to exchange heat with BOG and liquefy the BOG; and dependence, on an aboard BOG compressor, of a current BOG recycling device is avoided, and therefore, the efficient and energy-saving BOG recycling device has the advantages of being safe, energy-saving, efficient and environmentally-friendly.

The invention discloses a device and method for measuring the contents of oxygen, nitrogen and part of organic gas in mixed gas. The method comprises the following steps: a mixed gas is introduced into a sample through a six-way valve; organic gas is detained through a Q column, residual oxygen and nitrogen are detected through a thermal conductivity cell (TCD) detector, a spectrogram is obtained,then the organic gas detained through the Q column is detected through a hydrogen flame (FID) detector, the spectrogram is obtained, and finally the peak areas of all components in the two spectrograms are measured through gas chromatography, so that the content of all the gases is obtained. The method disclosed by the invention is high in precision and accuracy, good in repeatability and simple,convenient and rapid to operate.

The invention discloses a sewage treatment powder agent preparation method, which includes the following specific steps: (1) weighing the following components in parts by weight: 50-55 parts of zeolite, 4-8 parts of polyferric chloride, 12-16 parts of sodium polyacrylate, 6-8 parts of polydimethyldiallylammonium chloride, 12-16 parts of aluminum potassium sulfate, 3-7 parts of manganese dioxide and 5-9 parts of copper chloride; and (2) calcining the zeolite at 800-850 DEG C for 1-3 hours under the protection of nitrogen and pulverizing to obtain zeolite powder; adding the polyferric chloride,the sodium polyacrylate and the polydimethyldiallylammonium chloride into water to prepare a solution, spraying the solution into the zeolite powder, air-drying at 35-50 DEG C, and grinding into a powder material again. The method has the advantages of high sewage treatment efficiency, low sewage treatment cost and easily available raw materials.