34results about "Nitrous acid" patented technology

The application belongs to the technical field of electrocatalysis, and discloses a bimetallic fluorinated metal organic framework catalyst, a preparation method thereof and application of the catalyst in active oxygen assisted membrane-free electrolytic ammonia oxidation for preparing nitrite, wherein the catalyst is prepared by self-assembly of Cu 2+ , Ni 2+ and a tetrakisfluorophthalic acid ligand through a solvothermal method, and there is a directional electron transfer effect between Cu and Ni. The application utilizes the Cu / Ni bimetallic electron synergistic effect to precisely regulate the d-band center of the catalyst, and a membrane-free electrolysis device is matched to save an expensive proton exchange membrane. The application provides a new efficient and feasible path for green, economical and scaled electrocatalytic synthesis of nitrite.

[Problem] To provide a nitrogen fixation method and a nitrogen fixation device which are capable of significantly reducing energy and cost and are easy to put into practical use. [Solution] According to the present invention, water 14, which is brought into contact with air and has dissolved the air, is brought into contact with a photocatalyst (photocatalyst layer 5), and the photocatalyst is irradiated with ultraviolet rays (light source 91), and thus ammonia, nitric acid, or nitrous acid is generated in the water 14 from nitrogen molecules in the air dissolved in the water 14 by a photocatalytic reaction.

Disclosed is an apparatus for conversion of ammonia into oxides of nitrogen which may comprise an adiabatic burner (108), a set of platinum / rhodium alloy catalytic gauzes (102A), (102B), and (102C), a waste heat recovery boiler (WHRB) (110), an absorption tower (302A), (302B), (302C), (302D) and (302E), a NaOH tank (306) and a surge tank (304). Further, the adiabatic burner may be configured to carry out catalytic oxidation of air and ammonia, using catalytic gauzes (102A), (102B), and (102C) of platinum / rhodium alloy. Further, the mixture of air and ammonia may be selectively oxidized to oxides of nitrogen, which may be absorbed in an alkali medium in the absorption tower (302A), (302B), (302C), (302D) and (302E), to yield sodium nitrites and nitrates.

This application relates to an organic compound, a perovskite precursor solution, a perovskite film, a perovskite cell, and an electric apparatus. The organic compound includes: a cation M; and an anion Q bonded to the cation M; where M includes one or more of CH3NH3+, CH5N2+, Cs+, and C2H5NH3+; and Q includes one or more of H2POx− and H2NOy−, where x and y are each independently an integer from 2 to 4.

The invention discloses a method for treating NOx in nitric acid production tail gas, which is characterized by comprising the following steps: introducing the nitric acid production tail gas into a first-stage absorption tower, and absorbing by using a NaOH solution with the concentration of 15-18%, so that the NOx conversion rate is 95.2-98.5%; the absorption liquid of the first-stage absorption tower is input into a conversion reactor for a conversion reaction; and returning the solution converted by the conversion reactor to the nitric acid production system to form circulation. The NOx in the tail gas is efficiently converted into high-purity sodium nitrate and sodium nitrite products by adopting a'two-stage absorption-conversion 'closed-loop process and accurately controlling parameters such as absorption liquid concentration, reaction temperature, pH value and retention time, and the high-purity sodium nitrate and sodium nitrite products are returned to a nitric acid production system to form a material closed loop. According to the method, the NOx concentration of the tail gas is reduced to 5 ppm or below, the resource utilization rate is increased to 98% or above, the traditional treatment cost is changed into production benefits, and high-valued conversion from pollutants to resources is achieved.

The invention relates to the technical field of sewage treatment and resource recovery, and discloses a sewage nitrogen recovery product and a preparation method and application thereof. The method comprises the following steps: (1) sequentially carrying out solid-liquid separation, ammonia nitrogen ion exchange and biological directional conversion on sewage to obtain reclaimed water I; (2) performing physical adsorption on the reclaimed water I to remove organic matters so as to obtain reclaimed water II; (3) when the prepared sewage nitrogen recovery product is sodium nitrite, sequentially concentrating and crystallizing the reclaimed water II to obtain sodium nitrite as a sewage nitrogen recovery product; and (4) when the prepared sewage nitrogen recovery product is sodium nitrate, sequentially concentrating, chemically oxidizing and crystallizing the reclaimed water II to obtain sodium nitrate as the sewage nitrogen recovery product. According to the multi-unit synergistic process adopted by the invention, efficient nitrogen product recovery is realized through organic combination of ammonia nitrogen ion exchange, biological directional conversion, physical adsorption, concentration and crystallization.

The invention discloses a preparation and application method of a photocatalytic denitration microreactor capable of realizing in-situ thermal regeneration of a catalyst, and relates to the technical field of photocatalytic denitration. The reactor is subjected to simple heating treatment, nitrate generated on the surface of the catalyst in the pyrolysis denitration process is converted into gaseous NO2 to be discharged out of the reactor, and in-situ regeneration of the catalyst is achieved. The method provided by the invention is used for long-acting removal of NO, is simple to operate, avoids complicated reactor disassembly and assembly steps, avoids a large amount of water resources required by traditional washing regeneration, and meets the production requirement of continuous denitration. The provided in-situ thermal regeneration micro-reactor denitration system not only improves the utilization rate of the catalyst, the energy efficiency and the space utilization rate, but also has a lasting and efficient denitration effect, certain economic value is generated while green denitration is guaranteed, and the in-situ thermal regeneration micro-reactor denitration system has wide application prospects.

A solid powder composition comprising one or more particles comprising nitrite and a proton source. Also disclosed are pharmaceutical compositions comprising the solid powder composition, methods of making the solid powder composition, materials and devices comprising the solid powder composition, methods of making same and methods of implanting same in the human or animal body.

The invention discloses a method for recovering sodium nitrite in furan ammonium salt waste liquid, and relates to the technical field of wastewater treatment. By optimizing the process design and regulating and controlling key parameters, the impurities in the waste liquid are accurately removed, the recovery rate of sodium nitrite and the product purity are remarkably improved, meanwhile, the energy consumption and the process complexity are reduced, and the problems of low recovery efficiency, poor product purity and high energy consumption in the prior art are solved.

Provided herein are pharmaceutically acceptable sodium nitrite and pharmaceutical compositions thereof. Also provided herein are methods for determining the total non-volatile organic carbon in a sodium nitrite-containing sample. Further provided herein are methods for producing pharmaceutically acceptable sodium nitrite. Still further provided herein are methods of treatment comprising the administration of pharmaceutically acceptable sodium nitrite.

The present disclosure relates to a system adapted to convert gaseous nitrous acid into gaseous nitric oxide. The system includes a catalytic converter and a nitric oxide analyzer. The catalytic converter includes a polytetrafluoroethylene tube and one or more concentric tubes or high surface substrates made of sulfonated tetrafluoroethylene-based fluoropolymer-copolymer positioned within the polytetrafluoroethylene tube.

The spray device includes a mist generating unit and a plasma activating unit. The plasma activation unit includes a tube made of a dielectric material, an external electrode provided on an outer surface of the tube made of the dielectric material, an internal electrode provided on an inner surface of the tube made of the dielectric material, and a high-frequency power source that applies a high-frequency voltage to the external electrode and the internal electrode. The positions of the outer electrode and the inner electrode in the axial direction of the dielectric material tube are configured so as not to overlap or only partially overlap. The spray device is configured such that the mist fed from the mist generation unit to one end of the dielectric material tube passes through the dielectric material tube, is activated by plasma, and is discharged from the other side of the dielectric material tube.

Provided herein is a process for preparing a nitrate comprising contacting a nitrogen oxide with a metal oxide under milling conditions to form a nitrate.

The present invention belongs to the technical field of precious metal compound preparation, and specifically relates to a method for preparing dinitrosodiammineplatinum, comprising the following steps: 1) dissolving platinum dichloride in dilute hydrochloric acid, reacting for a period of time, and then adjusting the concentration of platinum ions to 20 g / L to 100 g / L by adding water to obtain a chloroplatinous acid solution; 2) adding urea to the chloroplatinous acid solution, heating the reaction for a period of time, and obtaining a dichlorotetraammineplatinum solution; 3) introducing NOx gas into the dichlorotetraammineplatinum solution to react and generate a dinitrosodiammineplatinum precipitate; and 4) cooling the reaction product obtained in step 3) to room temperature, filtering, washing the filter cake with pure water, and drying to obtain the product. The present invention can produce high-purity dinitrosodiammineplatinum with low chloride and alkali metal impurity contents. The preparation method also has the advantages of simple production process operation, short production cycle, and environmentally friendly process.

The invention provides a nitrogenous gas sustained releasing agent that is capable of sustainably releasing off nitrogenous gases in the air at normal temperature and safe to handle and a nitrogenous gas sustained releaser composed of the same as well as a nitrogenous gas sustained releasing method, respiratory equipment, a package and a nitrogenous gas sustained releasing apparatus using said sustained releaser. The nitrogenous gas sustained releasing agent contains a layered double hydroxide having nitrite ions (NO2−) and / or nitrate ions (NO3−) included between layers. The nitrogenous gas sustained releaser composed of the sustained releasing agent is exposed to a gas containing carbon dioxide and water vapor to induce any one or more processes of sustained release of nitrous acid, self-decomposition of nitrous acid, oxidization / reduction of nitrous acid, and reduction of nitrite ions / nitrate ions thereby sustainably releasing off nitrogenous gases.

The invention relates to the technical field of chemical synthesis, and particularly discloses a method for preparing nitric acid and nitrous acid under a catalyst-free condition. The method comprises the following steps: atomizing deionized water to form micro-droplets, mixing the micro-droplets with high-purity nitrogen to construct a nitrogen-water micro-droplet mixed system, applying a radio frequency electric field to the system at normal temperature and normal pressure to perform micro-plasma discharge treatment, enabling nitrogen and water to react under a catalyst-free condition to generate nitric acid and nitrous acid, and collecting products through an absorption device. By adopting the technical scheme, green, low-carbon and high-selectivity synchronous synthesis of nitric acid and nitrous acid can be realized, the energy consumption and carbon emission are remarkably reduced, the process flow is simple, the raw materials are cheap, the operation is safe, the method can be coupled with a renewable energy power system, and the method is suitable for the fields of chemical fertilizers, medicines, electronic chemicals and the like.

This application relates to an organic compound, a perovskite precursor solution, a perovskite film, a perovskite cell, and an electric apparatus. The organic compound includes: a cation M; and an anion Q bonded to the cation M; where M includes one or more of CH3NH3+, CH3N2+, Cs+, and C2H5NH3+; and Q includes one or more of H2POx- and H2NOy-, where x and y are each independently an integer from 2 to 4.

A plasma process for synthesis of nitrates and nitrites is described. The proposed process utilizes an electrical discharge in a two-phase gas-liquid mixture of oxygen, nitrogen and water droplets, the average droplet size being less than 200 micrometers. The presence of microdroplets changes the electrical discharge, particularly by creating local regions of enhanced electric field near the droplet surface where the plasma-induced chemical reactions are intensified. Further, the microdroplets suppress the reverse chemical reaction and enhance the direct reaction of nitrate / nitrite formation, thus increasing the amount of product for the same input energy and decreasing the energy cost per unit product. The proposed process thus enables plasma production of nitrate fertilizer with reduced energy costs.

The present disclosure provides autocatalytic cycles and chemical reactor systems in which the autocatalytic cycles may be conducted. Also provided are methods of identifying the autocatalytic cycles and methods of conducting the autocatalytic cycles, e.g., to produce a desired product. Regarding the methods of conducting the autocatalytic cycles, such a method comprises: carrying out a comproportionation reaction by reacting a first reactant M1 and a second reactant M2 to form a product M3, wherein M1, M2, and M3 each comprise at least one chemical element in common and the product M3 is produced in stoichiometric excess; and carrying out an auxiliary reaction by converting the product M3 to M1 or M2.

The present disclosure describes about a free flowing sodium nitrite and a method (200) of obtaining the free flowing for sodium nitrite. The method (200) may comprise various steps such as optimizing (202) the concentration of SNI, heating (206) of sodium nitrite slurry at 50 to 600 rpm, gradually cooling (208) the heated mass below 45° C., filtering (210) the wet mass, drying a filtered mass (212), and sieving (214) the dried mass to obtain the free flowing sodium nitrite comprising a spherical or oval shape granules. The spherical or oval shaped granules of SNI obtained has a moisture content of less than 0.15%, mesh size of more than 60 BSS in an amount 60-80% of the total content, the particle size of at least 0.25 mm in an amount 60-80% of the total content, angle of repose between 25° to 37° and Hausner ratio of 1.03 to 1.17.

The application discloses a gaseous nitrous acid generating device and a generating method, which comprise a constant temperature control unit, a gas tank, a nitrite mixed solution tank, an atomizing nozzle, a gas cylinder and a detection unit. The constant temperature control unit is provided with the gas tank, the nitrite mixed solution tank and the atomizing nozzle. The input end of the atomizing nozzle is communicated with the nitrite mixed solution tank, and the spraying end is communicated with the gas tank. The atomizing nozzle is used for spraying the nitrite mixed solution in the nitrite mixed solution tank into the gas tank in a mist state. The gas tank is provided with an air inlet and an air outlet. The output end of the gas cylinder is communicated with the air inlet and the air outlet and then communicated with the detection unit. The application has the advantages that the customized glassware is cancelled, the generating device is simplified, the cost is reduced, the nitrite mixed solution is atomized by the atomizing nozzle, the gaseous nitrous acid is dispersed in the gas tank, and the output efficiency is improved.

An atomizing method comprises providing an atomizer including a mist generator and a plasma producer. The plasma producer includes a tube of dielectric material, an external electrode on an outside surface of the tube of dielectric material, an internal electrode on an inside surface of the tube of dielectric material, and a high-frequency power supply for applying a high-frequency voltage between the external electrode and the internal electrode. Mist from the mist generator is plasma-activated while passing through the tube of dielectric material and emitted from an end of the tube of dielectric material. The external electrode and the internal electrode are located such that location of the external electrode and location of the internal electrode does not overlap or merely partially overlap in the longitudinal direction of the tube of dielectric material. Peroxynitrous acid is continuously generated by generating hydrogen peroxide and nitrous acid using plasma-activated water mist.

Provided herein are pharmaceutically acceptable sodium nitrite and pharmaceutical compositions thereof. Also provided herein are methods for determining the total non-volatile organic carbon in a sodium nitrite-containing sample. Further provided herein are methods for producing pharmaceutically acceptable sodium nitrite. Still further provided herein are methods of treatment comprising the administration of pharmaceutically acceptable sodium nitrite.

The invention relates to the technical field of electrocatalytic materials, and mainly discloses a NiO / Cu2Se heterostructure catalyst rich in selenium vacancies and a preparation method and application thereof, the catalyst is of a heterojunction structure formed by a NiO phase and a CuSe phase, the selenium vacancies are introduced into Cu2Se crystal lattices, and the chemical general formula is shown as NiO / CuSe-VSe. In an electrolyte system of 0.5 M KOH and 50 mM NH3.H2O, the initial potential is as low as 1.35 V, the initial potential is obviously superior to that of a NiO / CuO control sample without selenium vacancy and is also superior to that of most reported non-noble metal-based AOR catalysts, in addition, the catalyst can efficiently and highly selectively convert ammonia into nitrite in an oriented manner, and the application prospect is wide. The catalyst can still keep excellent catalytic performance after continuous operation for 96 hours, firstly, selenate radical species formed on the surface stabilize nickel active sites in a proper oxidation state, excessive generation of NiOOH and structural dissolution caused by the excessive generation of NiOOH are effectively inhibited, meanwhile, a stable heterostructure serves as a firm framework, and the catalytic performance of the catalyst is improved. And agglomeration and loss of active components in long-term operation are prevented.

The invention discloses a point discharge plasma nitrogen fixation device and method based on plane medium assistance. The nitrogen fixation device comprises a plasma generator, a reactor and a gas system, the plasma generator is used for discharging, the gas system is used for providing reaction gas, the reactor is an electrolytic tank, an electrolyte is arranged in the electrolytic tank, the electrolyte is provided with a plane medium, and the plane medium is provided with a nitrogen source. The planar medium takes foamed nickel as a substrate, the surface of the foamed nickel is loaded with oxide and / or hydroxide, and the foamed nickel is completely wetted and placed at an electrolyte interface before reaction, so that the plasma discharge effect acts on foamed nickel pores. The design of the reaction system aims to improve the ionization degree of the gas by introducing the planar solid-phase medium, so that a stable micro-discharge environment is favorably formed at an interface by a discharge electric field, heat energy or ineffective current loss is reduced, and the nitrogen activation efficiency and the energy utilization rate are remarkably improved.

The invention provides a nitrogenous gas sustained releasing agent that is capable of sustainably releasing off nitrogenous gases in the air at normal temperature and safe to handle and a nitrogenous gas sustained releaser composed of the same as well as a nitrogenous gas sustained releasing method, respiratory equipment, a package and a nitrogenous gas sustained releasing apparatus using said sustained releaser. The nitrogenous gas sustained releasing agent contains a layered double hydroxide having nitrite ions (NO2-) and / or nitrate ions (NO3-) included between layers. The nitrogenous gas sustained releaser composed of the sustained releasing agent is exposed to a gas containing carbon dioxide and water vapor to induce any one or more processes of sustained release of nitrous acid, self-decomposition of nitrous acid, oxidization / reduction of nitrous acid, and reduction of nitrite ions / nitrate ions thereby sustainably releasing off nitrogenous gases.

Provided herein are pharmaceutically acceptable sodium nitrite and pharmaceutical compositions thereof. Also provided herein are methods for determining the total non-volatile organic carbon in a sodium nitrite-containing sample. Further provided herein are methods for producing pharmaceutically acceptable sodium nitrite. Still further provided herein are methods of treatment comprising the administration of pharmaceutically acceptable sodium nitrite.

The present invention discloses a preparation method and a generating system for gaseous nitrous acid. The preparation method includes: placing nitrogen dioxide and water vapor under high-temperature conditions to generate gaseous nitrous acid. Among them, under high-temperature conditions, part of the nitrogen dioxide thermally decomposes to generate nitric oxide, and gaseous nitrous acid is generated by the chemical equilibrium reaction of nitrogen dioxide, nitric oxide and water vapor under the high-temperature conditions. The generating system mainly includes a zero air source, a nitrogen dioxide source, a flow control device, a humidity generating device, a constant-temperature gas mixing chamber, and a heating device. It has a simple structure, easily available raw materials, convenient operation, and can stably and repeatedly generate gaseous nitrous acid with adjustable concentration and humidity.