38results about "Ammonium salt preparation" patented technology

The utility model relates to an energy-saving device for recovering high-purity ammonia from wastewater, and belongs to wastewater treatment in the field of environmental protection. Comprising a deamination tower, a preheater, a wastewater cooler, a heat compensation heat exchanger, a compressor and a throttle valve, the deamination tower comprises a heating section, a deamination section, a condensation section, an ammonia washing section and a purification section; the ammonia washing section is provided with a pure water inlet and an ammonia water outlet, and the purification section is provided with a dilute acid aqueous solution inlet and a salt solution outlet. Low-grade waste heat is converted into a high-grade heat source through the compressor, fresh steam is replaced, and the purpose of saving energy is achieved. The problem that tail gas emission needs retreatment in the prior art is solved, zero emission of tail gas is achieved, and meanwhile co-production of ammonia water and ammonium salt is achieved.

The utility model relates to the field of wastewater treatment devices, in particular to an ionic rare earth high-chlorine ammonia-nitrogen wastewater treatment and resource recycling system. The system comprises a chlorine salt reaction device (1), a deamination system (2), a solid-liquid separation system (3), an evaporation system (4) and a drying system (5), the chlorine salt reaction device (1) is a chlorine salt reactor; a deamination system (2), a solid-liquid separation system (3), an evaporation system (4) and a drying system (5) are sequentially connected behind the chlorine salt reactor; and the chlorine salt reaction device (1) is respectively connected with a high-chlorine ammonia-nitrogen wastewater conveying pipeline (6) and a slaked lime adding device (7). According to the utility model, two inorganic products, namely an ammonium product and calcium chloride, are obtained, so that not only is the wastewater treated, but also good economic benefits are achieved.

An apparatus and method for producing ammonium bicarbonate in an ammonia-based decarbonation system is provided. The apparatus includes a cooling functional zone operable to cool a process gas, an ammonium bicarbonate production zone operable to produce ammonium bicarbonate, a carbon dioxide absorption zone operable to absorb carbon dioxide from the process gas via multi-stage absorption, and an ammonia removal functional zone operable to remove ammonia from the decarbonated process gas, in which absorbent ammonia for carbon dioxide removal is mainly added to the carbon dioxide absorption zone. Through the zone control of ammonium bicarbonate production, CO2 absorption and ammonia removal, the efficiency of decarbonation absorption can be improved and ammonia leakage can be reduced. Meanwhile, the carbon dioxide in the flue gas can be utilized for the production of ammonium bicarbonate as a nitrogen fertilizer.

A method of forming an ammonia product and / or ammonium product includes - Feeding a feed stream containing ammonia to a stripper (2) at temperatures below the boiling point of water, - Introducing a stripper gas into the stripper at a stripper gas inlet (16), contacting the feed stream with the stripper gas, and removing the stripper gas at a stripper outlet (17), - Forming a condensate from the stripper gas in a condenser (20), - Feeding the condensate to a process unit (25), - Forming an ammonia and / or ammonium product in the process unit (25), and - Feeding an outlet (34,48) of the process unit (25) to the stripper gas inlet (16) of the stripper (2). Also a system (1) for removing ammonia from an ammonia containing effluent is described.

The present invention relates to a process for the production of ammoniacal nitrogen, which comprises carrying out dinitrogen reduction in the presence of a compound of formula (I) containing at least one element of group 13 of the periodic table and a reducing agent, and to the use of a compound of formula (I) for the dinitrogen reduction.

The present invention relates to the technical field of aqueous ammonia preparing devices. Disclosed is a device for preparing aqueous ammonia from liquid ammonia, the device comprising: a reactor (100) having a raw-material inlet (101) and an aqueous-ammonia outlet (102) capable of discharging aqueous ammonia; a pressure relief mechanism (200) comprising an exhaust channel (201) arranged on the raw-material inlet (101) and a pressure relief valve element (202) arranged in the exhaust channel (201); an opening and closing door (300) arranged on the raw-material inlet (101); and an inlet self-locking mechanism (400). By providing the opening and closing door (300) and the inlet self-locking mechanism (400), the air pressure inside the reactor (100) becomes higher and higher due to the generation of ammonia gas and the increase in temperature, and the gas inside the reactor (100) can push the pressure relief valve element (202) to move in a first direction, such that the pressure relief valve element (202) opens the exhaust channel (201), the gas can then be discharged by means of the exhaust channel (201), and the air pressure inside the reactor (100) is reduced, and by locking the opening and closing door (300), the opening and closing door (300) cannot be opened, thereby avoiding the problem of potential safety hazards caused by excessively high air pressure inside the reactor (100).

The utility model relates to the technical field of coal chemical industry, in particular to a device for removing ammonia in raw gas in the process of producing hydrogen from coal. The ammonia washing tower comprises an ammonia washing tower body, a water inlet and a water outlet are fixedly connected to the top and the bottom of the ammonia washing tower body respectively, round pipes are fixedly connected into the water inlet and the water outlet, a cavity is formed in a shell of each round pipe, a resistance wire is fixedly connected to the rear end of each cavity, and a power source is fixedly connected to the other end of each resistance wire. A sensing rod is fixedly connected to the front end of the power source, a sliding pipe is slidably connected to the front end of the cavity, the structure of the sliding pipe is the same as that of the round pipe, internal element connection is also the same as that of the round pipe, and a filter screen is fixedly connected to the front end of the sliding pipe. The device for decomposing the ammonium salt crystals is additionally arranged at the water inlet, so that the treatment of the ammonium salt crystals at the water inlet is realized.

The invention discloses a cobalt carbonate wastewater recycling application method, belongs to the field of industrial wastewater treatment, and solves the problems of low ammonium chloride yield and high reagent consumption in the existing method. The method comprises the following steps: carrying out decarburization treatment, wherein the decarburization pH value is 6.01-6.05; carrying out two-stage de-weighting; the water subjected to weight removal enters an MVR evaporation system to be evaporated, and the water enters a falling film evaporator after being heated by a plate heat exchanger; the slurry enters a forced evaporator to be further evaporated and concentrated; the slurry enters a thickener and is circularly separated in the thickener, concentrated liquid enters a centrifugal separation procedure, hot steam is conveyed into a discharging conveying belt and a discharging pipeline in the salt discharging process of a centrifugal machine, drying is carried out while salt discharging is carried out, and ammonium chloride is obtained. According to the invention, the working procedures are improved, so that the operation process is greatly shortened, the energy-saving effect is obvious, the yield of ammonium chloride is increased by 15-20%, the consumption of hydrochloric acid is reduced by 30%, and the consumption of ammonia water is reduced by 10-15%.

This invention discloses a Co 0.2 Cd 0.8 This paper describes the preparation method of S / CaTiO3 / NiSx materials and their application in photocatalytic nitrogen fixation, belonging to the field of photocatalytic materials technology. Firstly, an S-type heterostructure Co was prepared using an ultrasonic method. 0.2 Cd 0.8 S / CaTiO3 composite, then using ultrasound to bond metalloid NiS x Nanoparticle co-catalysts and Co 0.2 Cd 0.8 S / CaTiO3 complex forms Co 0.2 Cd 0.8 S / CaTiO3 / NiS x Ternary composite photocatalyst. The semiconductor Co in this invention... 0.2 Cd 0.8 S and semiconductor CaTiO3 first form an S-type heterostructure, which not only accelerates the directional movement and separation of photogenerated electrons and holes, but also maintains the strong redox capability of photogenerated charge carriers; in addition, NiS is loaded onto the S-type heterostructure. x co-catalyst, NiS x Nanoparticle co-catalysts, acting as electron-capturing centers, can not only provide more reactive sites but also further improve charge separation efficiency.

A system for removing ammonia from an ammonia-containing liquid, comprising a heat exchanger, an ammonia stripper and an acid scrubber, wherein the ammonia stripper comprises at least two stripper units, which are in fluid communication with one another through a series connection, forming a fluid flow path from the ammonia-containing liquid inlet through the at least two stripper units to the liquid discharge outlet, and wherein the acid scrubber comprising at least two scrubber units, which are in gas communication with one another and the at least two stripper units through a series connection, forming a gas flow path from the air inlet through the at least two stripper units and scrubber units to the scrubber air outlet which is opposite to the fluid flow path through the striper units.

This invention provides an integrated process for processing ammonium fluorosulfate, a by-product generated in the production of bis(fluorosulfonyl)imides. [Solution] A process for processing ammonium fluorosulfate byproducts includes providing an ammonium fluorosulfate byproduct mainly comprising ammonium fluorosulfate and smaller amounts of fluorosulfonic acid and bis(fluorosulfonyl)imide; mixing the ammonium fluorosulfate byproduct with water; reacting the mixture of ammonium fluorosulfate byproducts and water at a hydrolysis reaction temperature to hydrolyze ammonium fluorosulfate, fluorosulfonic acid and bis(fluorosulfonyl)imide to form ammonium bicarbonate and an aqueous hydrogen fluoride solution; and separating ammonium bicarbonate from the aqueous hydrogen fluoride solution.

A process for producing ammonium sulfite and ammonium bisulfite from an ammonia gas stream. The process involves injected sulfur dioxide into a circulating liquid stream to an optimal pH that captures gaseous ammonia from a gas stream. The captured ammonia reacts with sulfur dioxide and water to form the desired products.

A system for separating ammonia from an aqueous stream. The system can include a flash vessel configured to receive an aqueous stream and to separate a flashed vapor from liquid in the aqueous stream. An ammonia enrichment unit can be disposed at an upper portion of the flash vessel configured to receive the flashed vapor. The ammonia enrichment unit can include a mass transfer device configured to separate an ammonia-enriched stream at an upper portion of the ammonia enrichment unit from a bottoms liquid having a lower concentration of ammonia than the ammonia-enriched stream.

The present invention relates to the technical field of drug synthesis. A first aspect of the present invention provides a preparation method for a monochloramine organic solution. Another aspect of the present invention provides a use of the preparation method in amination reaction or in preparation of compound 4. The other aspect of the present invention provides a preparation method for compound 4. The present invention also provides preparation methods for compounds 2 and 3. The present invention has a short entire process route, low costs, less generation of three wastes, simple post-treatment, high yield and excellent product quality, and is suitable for industrial production.

The invention provides an ammonia chemical species desorption process capable of desorbing ammonia chemical species adsorbed onto a Prussian blue derivative more simply at lower cost under milder conditions as compared with the use of an aqueous solution of a salt or strong acid, and more efficiently as compared with the use of only water. This ammonia chemical species desorption process comprises an ammonia chemical desorption step of bringing carbon dioxide and water into contact with a Prussian blue derivative represented by the following general formula (1), thereby desorbing an ammonia chemical species.         AxM[M' (CN) 6]y·zH2O ···     (1) where x is 0 to 3, y is 0.1 to 1.5, z is 0 to 6, A is at least one cation of hydrogen, ammonium, an alkaline metal, and an alkaline earth metal, and M and M' are each independently at least one cation of at least one of atoms having atomic numbers 3 to 83 except for ammonium, an alkali metal, and an alkaline earth metal.

In one aspect, the disclosure relates to system for recovering ammonia and phosphorus from a waste stream, methods of using the system to precipitate phosphorus as vivianite and to separate ammonia from total organic carbon in the waste stream, methods of modifying a nanofiltration membrane to exhibit selectivity for ammonia passage relative to total organic carbon passage, and compositions including fertilizers produced using recovered ammonia, phosphorus, and optionally potassium from the waste stream. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

The present invention relates to a method of producing green hydrogen and associated products from pyrite separated from mine waste (e.g., disposed tailings or active tailings streams) in an energetically self-sustained process. This is achieved by a method according to the present invention comprising the following steps: (a) separation and enrichment of a mine waste material comprising pyrite to obtain a pyrite concentrate, (b) oxidation of the pyrite concentrate to obtain SO2 gas; (c) separation of the SO2 gas; (d) utilization of SO2 gas from step (c) to generate H2 gas and H2SO4 via a SO2-depolarized electrolyzer (SDE) process or a sulfur-iodine-cycle (S-I-cycle) process.

A process for an efficient carbon-free fertilizer production from renewable resources generates utilizable energy for grid balancing. The integrated fertilizer production process entails the steps of hydrogen production, nitrogen production, ammonia production, nitric acid production, neutralization, and granulation with the utilization of renewable resources of energy such as hydroelectric power, solar photovoltaic power, and wind power.

A method and system are provided for synthesizing nitrogen-containing compounds, including ammonia, urea, amino acids, and ammonium salts, under ambient temperature and pressure conditions without the use of external catalysts or high-energy input. A nitrogen-containing gas and water are introduced into an aqueous solution through a submerged bubble-diffusing component, generating microbubbles that collapse and rupture to form high-energy microenvironments. These environments facilitate in situ molecular dissociation and the formation of reactive nitrogen species, including ammonia as an intermediate. The method supports reaction with co-solutes such as carbon dioxide, organic acids, or inorganic anions to yield target compounds. Optional low-energy augmentations—such as ultraviolet irradiation, ultrasonic agitation, or shear mixing—may enhance yield and selectivity. The system is compatible with isotopic gas variants and can be configured for batch or continuous-flow operation. Applications include decentralized production of fertilizers and biochemical precursors in agricultural, hydroponic, or laboratory settings.

The invention discloses iron-doped barium titanate nanoparticles and application thereof in piezoelectric catalytic nitrogen reduction. The method comprises the following steps: reacting an iron source, a titanium source and a barium source in a solution to obtain iron-doped barium titanate nanoparticles, and catalyzing nitrogen reduction by using the iron-doped barium titanate nanoparticles to generate ammonium (NH4 +). The iron-doped barium titanate nano-particles are used for performing piezoelectric catalysis on nitrogen reduction, so that enhanced piezoelectric response is achieved, and the catalytic performance is stable; experiments prove that the nitrogen fixation and ammonia conversion efficiency of barium titanate (Fe-BTO-3) with the iron doping ratio of 3% reaches 66.72 [mu] mol.g <-1 >. H <-1 > (830 [mu] mol.L <-1 >. G <-1 >. H <-1 >), which is far higher than the nitrogen fixation capacity of the currently reported piezoelectric material.

Systems and methods for recovering ammonia from an aqueous solution are disclosed. The systems include a plurality of modules arranged in series, each module having a plurality of membranes, each membrane having a lumen side and a shell side. The plurality of modules include a lead module having a shell inlet fluidly connected to a source of the aqueous solution, an end module having a lumen inlet fluidly connected to a source of an acidic solution, and an optional intermediate module positioned between the lead module and the end module. The methods include directing the aqueous solution to the lead module and directing the acidic solution to the end module to produce an effluent and a product containing ammonium.

Apparatus and method for producing ammonium bicarbonate in an ammonia-based decarbonization system are provided. The apparatus comprises a cooling function zone operable to cool a process gas; an ammonium bicarbonate generation zone operable to generate ammonium bicarbonate; a carbon dioxide absorption zone operable to absorb, via multi-stage absorption, carbon dioxide from the process gas; and an ammonia removal function zone operable to remove ammonia from a decarbonized process gas, wherein absorbent ammonia for carbon dioxide removal is mainly added into the carbon dioxide absorption zone. Through zone control of ammonium bicarbonate generation, CO2 absorption and ammonia removal, the efficiency of decarbonization absorption may be improved, and ammonia escape may be reduced. Meanwhile, carbon dioxide in flue gas can be utilized for producing ammonium bicarbonate as a nitrogen fertilizer.

A process for producing ammonium sulfite and ammonium bisulfite from an ammonia gas stream. The process involves injected sulfur dioxide into a circulating liquid stream to an optimal pH that captures gaseous ammonia from a gas stream. The captured ammonia reacts with sulfur dioxide and water to form the desired products.

Systems and methods for recovering ammonia from an aqueous solution are disclosed. The system includes more than one module arranged in series, each module having more than one membrane, each membrane having a lumen side and a housing side. The more than one module includes a leading module having a housing inlet fluidly connected to a source of aqueous solution, an end module having a lumen inlet fluidly connected to a source of acidic solution, and an optional intermediate module positioned between the leading module and the end module. The method includes directing an aqueous solution to a leading module and an acidic solution to an end module to produce an effluent and a product comprising ammonium.

The present invention relates to an integrated electrochemical process for the production of ammonium sulfate, operating at low temperature and pressure, using only renewable energy sources and reclaiming phosphogypsum waste and CO2 emissions of the phosphate industry.

A process for treating an ammonium fluorosulfate byproduct includes providing an ammonium fluorosulfate byproduct including primarily ammonium fluorosulfate and lesser amounts of fluorosulfonic acid and bis(fluorosulfonyl) imide, mixing the ammonium fluorosulfate byproduct with water, reacting the mixture of the ammonium fluorosulfate byproduct and the water at a hydrolysis reaction temperature to hydrolyze the ammonium fluorosulfate, the fluorosulfonic acid and the bis(fluorosulfonyl) imide to form ammonium bisulfate and aqueous hydrogen fluoride; and separating the ammonium bisulfate from the aqueous hydrogen fluoride.

Methods and systems for capturing carbon dioxide and utilizing calcium sulfate to produce useful products are disclosed.

The invention discloses a method for preparing ammonium by reducing nitrate radicals by oxidizing modified pyrite with Fe < 3 + >, and belongs to the technical field of water treatment and resource recovery. The method comprises the following steps that S1, acid-washed pyrite and a Fe < 3 + > solution are mixed and oxidized, and oxidation modified pyrite is obtained; and S2, under the anaerobic condition, mixing the oxidation modified pyrite with an alkaline nitrate solution, and reacting in a dark place. According to the method, nitrate can be efficiently and selectively reduced into ammonium, no external energy or noble metal catalyst is needed, the highest removal rate of nitrate can reach 99.8%, the highest conversion rate of ammonium can reach 100%, and the method is suitable for wastewater denitrification and resource recovery treatment.