14results about "Ammonium carbonates/bicarbonates" patented technology

The application discloses a recycling method of condensate of ammonia shift stripping tower, comprising the following steps: S1 condensate cooling: hot condensate with a temperature of 80-100 DEG C is led out from the lower part of the ammonia shift stripping tower; S2 split delivery: the cooled condensate is divided into two routes by a condensate pump: the first route is sent to a synthetic gas washing tower to replace fresh desalted water for cooling and demisting of the synthetic gas, and fresh water consumption is reduced; the second route is sent to a carbonization mother liquor tank; S3 ammonia absorption concentration: the ammonia absorption pump is used to deliver the ammonia absorption mother liquor in the carbonization mother liquor tank to a high ammonia absorber; S4 concentrated ammonia water cooling: the concentrated ammonia water after concentration is sent into an air-cooled heat exchanger; S5 carbonization reaction product: ammonia in the concentrated ammonia water reacts with carbon dioxide to generate ammonium bicarbonate crystals, and ammonium bicarbonate products are obtained after separation and drying. The whole recycling process can be directly connected with the existing ammonia production system, the existing equipment does not need large-scale modification, the investment cost is low, and the industrialization popularization is easy.

The present disclosure provides methods and systems for capturing carbon dioxide. An example system includes: a pyrolysis device configured to produce syngas and bio-oil from biomass; a power generator configured to produce electricity by combusting at least one of the syngas or the bio-oil; and a carbon capture system configured to use the electricity to capture carbon dioxide from a gas.

The application relates to a method for recycling secondary aluminum ash, which comprises the following steps: obtaining an aluminum-containing suspension and a first ammonia-containing gas by alkali leaching of the secondary aluminum ash; obtaining an aluminum-containing solid phase and a met-aluminate mother liquor by solid-liquid separation of the aluminum-containing suspension; obtaining an ammonium bicarbonate solution by first cooling and first carbonization of the first ammonia-containing gas; and mixing the met-aluminate mother liquor and the ammonium bicarbonate solution to prepare aluminum hydroxide. The method solves the pollution problem of the secondary aluminum ash, realizes efficient recovery of aluminum resources in the secondary aluminum ash, preferably has a recovery rate of active aluminum of more than 94.0%, and preferably has a total recovery rate of aluminum of more than 97.5%. The method realizes safe treatment and resource utilization of the secondary aluminum ash, and has the advantages of mild conditions, simple operation and easy industrial large-scale application.

The present application relates to the technical field of chemical production, and particularly relates to a magnesium oxide preparation method, comprising the following steps: step S1: obtaining a suspension slurry by calcining and digesting magnesite; step S2: obtaining a carbonized liquid by carbonizing the suspension slurry; step S3: mixing the carbonized liquid with alkali to perform a magnesium precipitation reaction, and obtaining magnesium carbonate precipitation and a magnesium precipitation liquid; and step S4: obtaining a magnesium oxide product by drying and calcining the magnesium carbonate precipitation. Compared with the prior art, the present application does not need high-temperature pyrolysis when precipitating magnesium, and can effectively reduce energy consumption and production cost.

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.

The present disclosure provides methods and systems for capturing carbon dioxide. An example system includes: a pyrolysis device configured to produce syngas and bio-oil from biomass; a power generator configured to produce electricity by combusting at least one of the syngas or the bio-oil; and a carbon capture system configured to use the electricity to capture carbon dioxide from a gas.

This application relates to the field of chemical production technology and discloses a novel ammonium bicarbonate production system for carbon emission reduction and resource utilization. The system includes a carbon capture unit, an ammonia recovery unit, a low-temperature ammonia carbonization reactor, a centrifuge, a fluidized bed dryer, and a tail gas treatment unit connected in sequence. In this novel ammonium bicarbonate production system for carbon emission reduction and resource utilization, industrial waste gas (CO₂ concentration 10%-20%) enters a cyclone gas-liquid contactor, where it comes into countercurrent contact with amine liquid under the action of vortex plates. The CO₂ absorption rate is >95%, thus ensuring the sustainability of the raw material. The ammonia synthesis tail gas (NH₃ concentration 5%-8%) is cooled to -15°C by a condenser. After liquid ammonia recovery, the remaining gas enters an ammonia stripping tower for deep concentration, with an NH₃ recovery rate ≥98%, thus enabling efficient resource utilization. Unreacted tail gas is treated by a catalytic oxidation device, where NH₃ is oxidized to N₂ and H₂O under the action of a palladium catalyst. The emission concentration is controlled in real time to <10ppm by an online monitoring instrument, thus achieving full environmental compliance.

Systems and methods for in situ production of ammonia and / or ammonium salt compounds using subsurface geochemistry are provided. In some embodiments, one or more reactants can be delivered to a subsurface region for in situ formation of ammonia and / or ammonium salts. The reactants can be reacted with an ultramafic rock bed to form hydrogen gas (H2). The hydrogen gas can then be reacted with a nitrogen source to form ammonia that can be collected. In another embodiment, nitrogen gas can be pumped into contact with hydrogen gas released from the rock bed to form ammonium salts in the earth's crust that can be mined. In some other embodiments, a catalyst can be delivered with the reactants or the reaction can be facilitated by a catalyst in the rock bed to form ammonia gas in situ without the need for hydrogen gas formation.

The invention relates to a method for multi-stage ammonia-process decarbonization, the method comprising absorbing, using ammonia as an absorbent, CO2 from a process gas in an absorber including four or more stages of absorption, the four or more stages including, sequentially arranged along the flow direction of the process gas, a first-stage absorption, a second-stage absorption, a third-stage absorption, a fourth-stage absorption, and an optional higher stage absorption; and controlling a temperature of the process gas in the second- and third-stage absorptions to be not lower than a temperature of the process gas in the first-stage absorption, and a temperature of the process gas in the fourth- and the optional higher-stage absorptions to be lower than the temperature of the process gas in the first-stage absorption.

This utility model relates to an apparatus for preparing light potassium carbonate from urea waste ammonia water; it includes an ammonium bicarbonate preparation unit and a potassium chloride solution preparation unit. The ammonium bicarbonate preparation unit includes a waste ammonia water pipeline from the urea system, which is connected to the inlet of a waste ammonia water tank. The outlet of the waste ammonia water tank is connected to the upper inlet of a carbonation tower via a heat exchanger. A carbon dioxide pipeline is connected to the bottom gas phase inlet of the carbonation tower via a carbon dioxide compressor. The liquid phase outlet at the bottom of the carbonation tower is connected to an ion exchange unit, which is equipped with a potassium bicarbonate solution pipeline connected to the evaporation section. The potassium chloride preparation unit is connected to the ion exchange unit, which is equipped with an ammonium chloride solution pipeline connected to subsequent sections. This apparatus features a reasonable process design, is environmentally friendly, and effectively reduces the production cost of light potassium carbonate while addressing the high investment and operating costs associated with waste ammonia water treatment.

This application relates to the field of sodium sulfate resource utilization technology, specifically disclosing a system and method for the resource-based production of sodium bicarbonate and ammonium sulfate from sodium sulfate waste salt or high-concentration wastewater. A method for the resource-based production of sodium bicarbonate and ammonium sulfate from sodium sulfate waste salt or high-concentration wastewater includes the following steps: S1: Dissolution: Prepare a solution from sodium sulfate waste salt or high-concentration wastewater; S2: Purification; S3: Carbonation; S4: Separation and drying; S5: Concentration and crystallization: Concentrate the mother liquor I, then add a sodium salt with a solubility greater than that of sodium sulfate and sodium bicarbonate at 0-5℃ to precipitate double salt crystals of sodium sulfate and sodium bicarbonate. After filtration and centrifugation, obtain the double salt product and ammonium sulfate solution. The double salt product is returned to step S3 for reuse; S6: Flash evaporation purification. The method for the resource-based production of sodium bicarbonate and ammonium sulfate from sodium sulfate waste salt or high-concentration wastewater of this application has the advantages of high sodium sulfate utilization rate and high product purity.