25results about "Nitrous oxides" patented technology

This invention provides an apparatus and method for recovering nitrous oxide from high-ammonia-nitrogen wastewater using algae-bacteria symbiotic technology. The apparatus includes an aerobic reaction unit and an anoxic reaction unit; the first outlet of the aerobic reaction unit and the inlet of the anoxic reaction unit are connected, and a monovalent anion exchange membrane is installed at the connection point; the aerobic reaction unit is connected to a first gas collection unit via a first gas outlet, and the anoxic reaction unit is connected to a second gas collection unit via a second gas outlet, for recovering nitrous oxide generated in both the aerobic and anoxic reaction units. This invention, by inoculating the aerobic reaction unit with algae-bacteria symbiotic sludge that achieves short-cut nitrification, effectively reduces the aeration energy consumption of short-cut nitrification through microalgae photosynthesis, realizes the recovery of nitrous oxide in the aerobic reaction unit, reduces the denitrification load in the anoxic reaction unit, increases the denitrification conversion rate, and reduces operating costs, embodying a high-efficiency, low-carbon, and environmentally friendly design concept.

The utility model relates to a drying device, in particular to a drying device for preparing high-purity nitrous oxide by recovering adipic acid tail gas, which belongs to the technical field of adipic acid tail gas treatment and comprises a treatment mounting box, a liquid purification filter element is mounted at one end of the treatment mounting box, and a drying filter element is arranged on one side of the liquid purification filter element. A molecular filtering structure is designed on the other side of the drying filter element, a purification treatment filter element is clamped to one side of the molecular filtering structure, a product storage bin is designed at the other end of the treatment mounting box, and an air outlet control pump is mounted at one end of the product storage bin. The device is rapidly connected with an external structure, the use convenience of the device is improved, products pass through the device and are guided, corresponding gas is correspondingly treated and then is collected, and the classified collection efficiency of the products is improved.

The invention provides a catalyst for removing nitrous oxide and a method for removing nitrous oxide. The catalyst comprises metal oxide powder and an iron-copper compound. The iron-copper compound is attached to the surface of the metal oxide powder. The metal oxide powder includes zinc oxide, magnesium oxide, aluminum oxide, or a combination thereof. The molar ratio of iron in the iron-copper compound to metal in the metal oxide powder is 1: 1.3-4.0.

This invention provides a catalyst for removing nitrous oxide and a method for removing nitrous oxide. [Solution] The catalyst for removing nitrous oxide comprises a metal oxide powder and an iron-copper compound. The iron-copper compound is attached to the surface of the metal oxide powder. The metal oxide powder comprises zinc oxide, magnesium oxide, aluminum oxide, or a combination thereof. The molar ratio of iron in the iron-copper compound to the metal in the metal oxide powder is 1:(1.3~4.0).

The invention relates to a supported carbon-based catalyst, a preparation method and application, the supported carbon-based catalyst catalyzes a hydroxylamine nitrate solution to decompose to obtain a liquid-phase product and a gas-phase product; the loading amount of metal elements in the loaded carbon-based catalyst is 0.1-15 wt%; the metal element is selected from one of Pt, Ru, Rh and Pd; a carrier of the supported carbon-based catalyst is coconut shell activated carbon; the supported carbon-based catalyst is selected from at least one of Pt / C, Ru / C, Rh / C and Pd / C; the liquid phase product is selected from at least one of NH4 < + >, H < + >, NO3 <-> and NO2 <->; the gas phase product is selected from at least one of N2O, N2, NO and NO2. The supported carbon-based catalyst adopted by the invention is suitable for catalytic decomposition of low-concentration HAN, and can realize qualitative or quantitative analysis of gas-phase products and liquid-phase products generated by decomposition.

Provided is a catalyst system capable of removing perfluorinated compounds and nitrous oxide. An exhaust gas is heated in two stages through a heat exchange unit and applied to a heater unit. The heater unit generates a flame to heat the exhaust gas to a high temperature. A catalyst unit is directly connected to a heating space of the heater unit so the heated exhaust gas comes into contact with a catalyst, and the perfluorinated compounds and the nitrous oxide are decomposed in the catalyst unit.

Provided is a catalyst apparatus capable of removing perfluorinated compounds or nitrous oxide through a catalyst. A processing gas is introduced into a heat exchange unit, and an exhaust gas having a higher temperature than the processing gas discharged by a heat exchange action is supplied to a heating part. In the heating part, an exhaust gas capable of reacting with the catalyst may be formed through a simple temperature-raising operation, and the perfluorinated compounds or nitrous oxide are effectively removed by the catalyst unit.

A catalyst for removing nitrous oxide and a method of removing nitrous oxide are provided. The catalyst includes a metal oxide powder and an iron-copper compound. The iron-copper compound is attached to the surface of the metal oxide powder, where the metal oxide powder includes zinc oxide, magnesium oxide, aluminum oxide, or a combination thereof. A molar ratio of iron in the iron-copper compound to the metal in the metal oxide powder is 1:1.3-4.0.

A process for reducing the concentration of N2O in a gas stream and a chemical production unit therefor are provided, the process comprising: (a) providing a gas stream, containing N2O, (b) treating the gas stream with an aqueous washing fluid in an absorption unit operated with a liquid continuous phase, (c) passing the gas stream obtained in step (b) through a droplet separating unit; and (d) contacting the gas stream obtained in step (c) with a N2O decomposition catalyst. The use of a droplet separating unit after an absorption unit enhances the performance of the N2O decomposition catalyst.

An apparatus for catalytic decomposition of nitrous oxide in a gas stream derived from exhalation air from a patient. The apparatus comprises a casing housing a catalyst bed comprising a catalyst material promoting the decomposition of nitrous oxide. The casing comprises a gas inlet for a first gas stream derived from exhalation air from a patient. The casing comprises a gas outlets. The apparatus comprises one or more tubular members. The casing houses at least a portion of the tubular member. The tubular member comprises a gas inlet for a second gas stream comprising at least a portion of the first gas stream. The tubular member comprises a gas-permeable wall so as to provide one or more third gas streams from the tubular member to the catalyst bed. The third gas stream comprises at least a portion of the second gas stream.

The utility model relates to the technical field of nitrous oxide purification devices, in particular to a medical nitrous oxide purification device which comprises a purification tank with a supporting column at the lower end, a sealing cover detachably mounted at the upper end of the purification tank, an inner container fixedly mounted in the purification tank and used for containing purification liquid, and air outlet holes symmetrically formed in one end of the inner container. A mounting frame is rotatably mounted on the outer side of the inner container, annular purification plates are mounted on the outer side of the mounting frame in a linear array mode, mounting grooves are formed in the inner wall of the purification tank in a linear array mode, cleaning assemblies are mounted in the mounting grooves, an air inlet pipe is fixedly mounted at the lower end of the purification tank, and an air outlet pipe is fixedly mounted on the outer side of the purification tank; nitrous oxide gas is automatically purified through the purification liquid and the annular purification plate, the purification effect is good, impurities attached to sieve pores of the annular purification plate can be automatically sucked, and the sieve pores are prevented from being blocked after long-time use, and the purification effect is prevented from being reduced.

The present invention provides a method for producing frozen gas hydrates, the method comprising passing a liquid aqueous phase through a heat exchanger surface under an atmosphere of a pressurized water-soluble gas, characterized in that the conditions of the method are selected to ensure that there is both dissolution of the pressurized gas in the liquid aqueous phase and formation of a solidified continuous phase from solidification of the liquid aqueous phase in contact with the surface of the heat exchanger.

The invention belongs to the technical field of gas separation, and particularly relates to application of a metal organic framework material with an open Bi < 3 + > site in N2O separation. The molecular formula of the metal organic framework material is Bi9 (C9H3O6) 9 (H2O) 9, and the metal organic framework material is generated by taking bismuth nitrate pentahydrate as a metal source and trimesic acid as an organic ligand through reaction in a solvothermal environment. The metal organic framework material has an open Bi < 3 + > site, can generate high-specificity interaction with N2O molecules, and can still realize high-selectivity adsorption of N2O under the coexistence condition of a plurality of competitive gases such as N2, O2, CO2 and the like.

Provided are a gas decomposition method and a gas decomposition device that are designed to efficiently decompose a greenhouse gas by a simpler way or structure. The gas decomposition method includes irradiating a gas to be treated containing oxygen, dinitrogen monoxide, and a saturated hydrocarbon with first light having a main emission wavelength in a range of 160 nm or more and less than 200 nm to decompose the dinitrogen monoxide and the saturated hydrocarbon. The gas decomposition device includes a chamber to supply a gas to be treated containing oxygen, dinitrogen monoxide, and the saturated hydrocarbon and a first light source to irradiate the chamber with the first light.

The utility model discloses a nitrous oxide gas multi-section type condensing device which comprises a first condensing tank, a gas inlet pipe is fixedly connected to the top of the first condensing tank, a supporting assembly is fixedly connected to the side wall of the first condensing tank, and a second condensing pipe tank is fixedly connected to the inner side wall of the supporting assembly. Spiral heat exchangers are installed in the middle of the first condensation tank and the middle of the second condensation pipe tank, a circulating water assembly is fixedly connected to the side wall of the first condensation tank, and nitrous oxide gas entering the first condensation tank and the second condensation pipe tank can be subjected to segmented condensation treatment through the arrangement of the circulating water assembly and the spiral heat exchangers. Condensed gas is discharged through the gas inlet pipe, liquid is discharged through the liquid discharging pipe, the discharged liquid can be collected through the arrangement of the liquid collecting assembly, the first condensation tank and the second condensation tank can be stably supported through the arrangement of the supporting assembly, and the segmented condensation effect of the nitrous oxide gas multi-segment condensation device is enhanced.

The invention discloses a method for preparing N2O through DBD and ZrO2 catalysis, and belongs to the technical field of plasma catalysis. Comprising the following steps: uniformly filling zirconium dioxide balls into a discharge area of a hollow quartz tube by adopting a plasma reactor; introducing reaction gases NO, N2 and O2 into the discharge area; circulating cooling water is introduced into the hollow grounding electrode in the hollow quartz tube; an input power supply is connected to the discharge area to start discharging, and N2O is obtained after reaction. Compared with a traditional process, the method has the advantages that the energy consumption can be obviously reduced by more than 50%, and meanwhile, a complicated external heating and heat preservation system is omitted. Through the mutual synergistic effect of ZrO2, high-energy electrons and active free radicals, high-selectivity generation of N2O can be achieved, energy consumption is greatly reduced through normal-temperature operation, high-temperature risks are avoided, the reaction rate is high, starting and stopping can be fast, potential out-of-control hidden dangers are avoided, and the safety coefficient is greatly increased.

The application relates to the field of ammonium nitrate solution preparation, and particularly discloses a method for purifying chlorides in an ammonium nitrate solution and application thereof. The method for purifying chlorides in the ammonium nitrate solution comprises the following steps: after source water is treated by reverse osmosis to remove impurities, a chloride adsorbent is added to obtain desalted water; ammonia gas is reacted with oxygen to generate nitrogen oxides, the nitrogen oxides are reacted with the desalted water to generate dilute nitric acid; after liquid ammonia is gasified, ammonia gas is obtained, the ammonia gas is subjected to a neutralization reaction with the dilute nitric acid, and high-concentration ammonium nitrate solution is obtained after evaporation; and the chloride adsorbent is sodium alginate-coated activated carbon loaded with silver ions. According to the application, the chloride adsorbent is added into source water used for preparing the ammonium nitrate solution, so that the concentration of chlorides in the source water is reduced, and the chlorides in the prepared ammonium nitrate solution are removed.

This invention provides a modified LiMn2O4 catalyst for N2O preparation, its preparation method, and its application. The preparation method includes: calcining LiMn2O4 material, or mixing and calcining LiMn2O4 material with an alkali metal compound for loading modification, or pre-calcining LiMn2O4 material and then mixing and sintering the pre-calcined LiMn2O4 material with an alkali metal compound to obtain the modified LiMn2O4 catalyst. This invention modifies the number of Mn metal exposed sites by calcining LiMn2O4 material, loading alkali metal oxide clusters onto LiMn2O4 material, or combining both methods. This allows for the control of the number of Mn metal exposed sites, resulting in a modified LiMn2O4 catalyst that significantly improves N2O yield under low-temperature conditions, making it suitable for industrial production.

The utility model discloses a nitrous oxide purification device, which belongs to the field of gas purification and comprises a mounting bottom plate, a gas inlet mechanism is mounted on one side of the upper surface of the mounting bottom plate, an adsorption processing mechanism is mounted on the upper surface of the mounting bottom plate, and the adsorption processing mechanism comprises a processing kettle fixedly connected to the upper surface of the mounting bottom plate; through cooperative use of the devices, the gas conveying pipe and the sealing cover are mounted on the surface of the processing kettle, so that the adsorbent shell is inserted into the processing kettle, the rotating rod is rotated, the fixing rod drives the adsorbent shell to rotate in the processing kettle, and therefore the adsorbent shell is in threaded connection with the mounting block; through the mutual action force between the gravity of components such as the mounting block and the elastic force of the abutting spring, the adsorbent shell is stably mounted in the processing kettle, and through the threaded connection of the conveying pipe and the gas collecting bottle, the gas conveying pipe is limited, so that the adsorbent shell is more stable when being mounted in the processing kettle.

Provided is a catalyst system capable of removing perfluorinated compounds and nitrous oxide. An exhaust gas is heated in two stages through a heat exchange unit and applied to a heater unit. The heater unit generates a flame to heat the exhaust gas to a high temperature. A catalyst unit is directly connected to a heating space of the heater unit so the heated exhaust gas comes into contact with a catalyst, and the perfluorinated compounds and the nitrous oxide are decomposed in the catalyst unit.

The utility model discloses a cooling tower for preparing nitrous oxide, which belongs to the technical field of cooling towers, and comprises a cooling tower body, supporting legs, a liquid inlet, a valve, a mounting frame, a fan, a closed rainproof component and an auxiliary filtering component, the supporting legs are fixedly mounted at the lower part of the cooling tower body, the liquid inlet is arranged on the side wall of the cooling tower body, and the valve is arranged on the side wall of the cooling tower body. The closed rainproof assembly is arranged on the upper portion of the cooling tower body, the auxiliary filtering assembly is arranged outside the closed rainproof assembly, the arranged closed rainproof assembly is closed and opened in a rotating mode, and it is avoided that rainwater and sundries fall into a water collecting pool through a tower opening when the device is not used; therefore, the phenomenon that rainwater permeates into the water collecting tank through the opening in rainy days when the cooling tower is not used due to the fact that the air outlet in the top of the cooling tower cannot be completely closed is avoided, and then the problem that the solution is not pure due to the fact that the rainwater is mixed with the solution is solved.

The utility model discloses a nitrous oxide purification device which comprises a bottom frame, a purification frame, an adsorbent, an air inlet pipe and an exhaust pipe, the purification frame is installed on the top of the bottom frame, the adsorbent is located in the purification frame, the air inlet pipe is installed on the purification frame, the exhaust pipe is installed on the side wall of the bottom frame, and the nitrous oxide purification device further comprises a material changing assembly. And the material changing assembly is used for returning the adsorbent. Under the action of the material changing assembly, the saturated adsorbent can be automatically pushed out and automatically returned, so that the adsorbent can be conveniently replaced by a new adsorbent, the adsorbent does not need to be manually cleaned, and the trouble of manually cleaning the adsorbent is reduced.

Provided is a catalyst apparatus capable of removing perfluorinated compounds or nitrous oxide through a catalyst. A processing gas is introduced into a heat exchange unit, and an exhaust gas having a higher temperature than the processing gas discharged by a heat exchange action is supplied to a heating part. In the heating part, an exhaust gas capable of reacting with the catalyst may be formed through a simple temperature-raising operation, and the perfluorinated compounds or nitrous oxide are effectively removed by the catalyst unit.

The high-purity nitrous oxide preparation device comprises a reaction kettle body, two groups of first supporting legs are fixedly connected to the bottom of the reaction kettle body, and two rollers are fixedly connected to the middle, close to a fixing plate, of the reaction kettle body; through the structural design that a plurality of ejector pins are mounted in the middle of the second filter plate and are matched with the first filter plate for use, solid particles in the middle of the first filter plate are cleaned in time, so that a reaction mixture is continuously and efficiently filtered through the filter plates; according to the nitrous oxide preparation device, abnormal pressure change in the reaction kettle body and fluctuation of reactant flow caused by blockage of the first filtering plate are avoided, stable operation of the whole nitrous oxide preparation device is facilitated due to stable filtering efficiency, the production efficiency is improved, solid particle impurities in a reaction mixture can be more effectively removed due to a good filtering effect, and the product quality is improved. And the purity of the nitrous oxide gas entering the subsequent treatment process is higher.

A process for the catalytic oxidation of ammonia, comprising: passing an ammonia-containing gas, in the presence of oxygen, over a catalyst contained in a reactor, obtaining a process gas containing nitrogen oxides, and cooling said process gas with a heat exchanger accommodated in the reactor, wherein a portion of said process gas, located in the shell side, bypasses the heat exchanger and forms a hot current which mixes with cooled gas downstream the heat exchanger, and the bypass is regulated on the basis of a target outlet temperature of the mixed process gas.