13results 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.

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.

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 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.

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.

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.

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.

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.

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.

The invention discloses a plasma nitrogen fixation device of a spatial non-uniform plasma electric field, which belongs to the field of energy power equipment and comprises a solution storage device, a plasma reactor, a non-uniform thickness barrier medium, a high-voltage electrode, a central high-voltage electrode bar, a three-way connector, an air inlet, a grounding electrode and an absorption aqueous solution. The high-voltage electrode and the grounding electrode are respectively positioned in the nitrogen fixation device and the absorption aqueous solution, the non-uniform thickness barrier medium is made of polytetrafluoroethylene and clings to the surface of the high-voltage electrode, and the bottom of the plasma reactor is provided with a small hole for reaction tail gas to enter the absorption aqueous solution; one side of the three-way joint is connected with the high-voltage electrode and the plasma reactor, and the other side is connected with the air inlet. According to the invention, polytetrafluoroethylene with non-uniform thickness is used as a discharge barrier medium, a plasma electric field with non-uniform space is generated, the high-electric-field-intensity power generation characteristic and the low-electric-field-intensity discharge characteristic are coupled, the air nitrogen fixation efficiency is improved, and the problem that the air nitrogen fixation yield of an existing uniform-intensity electric field is limited is solved.