26 results about "Ammonium carbonate" patented technology

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

The application discloses a catalyst for preparing malononitrile, a preparation method of the catalyst and a method for preparing malononitrile by using the catalyst. The catalyst is a solid catalyst, which is an acidic catalyst loaded with rare earth metal oxide. The method for preparing malononitrile is that cyanoacetic acid or cyanoacetate or cyanoacetamide and an ammonia source are subjected to ammoniation dehydration reaction in a continuous reactor to prepare malononitrile according to a certain molar ratio. Then, vacuum distillation (20 torr-25 torr) is carried out, and a fraction collected at 110 DEG C-120 DEG C is malononitrile product. The ammonia source can be ammonia gas, ammonia water, ammonium carbonate or urea. The method for preparing malononitrile can reduce production cost, improve production safety, reduce the discharge amount of three wastes in the preparation of malononitrile by using an existing process, and improve product quality, and is a sustainable and green synthesis route.

This invention discloses a method for treating wastewater containing magnesium sulfate and ammonium sulfate. The method includes: evaporating and concentrating the wastewater containing magnesium sulfate and ammonium sulfate, then cooling and crystallizing it, followed by solid-liquid separation to obtain magnesium ammonium sulfate crystals and a mother liquor containing ammonium sulfate; reacting the magnesium ammonium sulfate crystals with an ammonium salt that can generate carbonate ions and water to undergo a precipitation reaction, followed by solid-liquid separation to obtain magnesium carbonate product and a mixed solution containing ammonium sulfate and ammonium carbonate; stripping the mixed solution containing ammonium sulfate and ammonium carbonate to obtain stripped water containing ammonium sulfate and an ammonium carbonate fraction; both the mother liquor containing ammonium sulfate and the stripped water containing ammonium sulfate can be evaporated and crystallized to obtain ammonium sulfate product; the ammonium carbonate fraction can be recycled for precipitation reactions. This invention can effectively separate magnesium and ammonium from wastewater, and the separated magnesium carbonate and ammonium sulfate products have high purity and good quality, and can be used directly as products.

This invention relates to compositions, particularly aqueous compositions, comprising: (a) guanidine and / or at least one unsubstituted guanidine salt, and (b) one or more carbonate compounds selected from sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, ammonium bicarbonate, and ammonium carbonate. The compositions are characterized in that the weight ratio of component (a) to component (b) is in the range of 1:14 to 54:1, and in each case, the weight ratio is determined based on the content of guanidine and carbonate ions in the entire composition. The invention further relates to industrial products comprising the compositions of the invention, and the use of the compositions for stabilizing aqueous industrial products against microbial invasion.

This invention discloses a catalyst and method for the continuous synthesis of formamide from ammonium carbonate or ammonium bicarbonate, belonging to the field of chemical technology. The catalyst is a boron-nitrogen co-doped activated carbon supported palladium catalyst prepared by using a palladium precursor, boric acid, and nitrogen-doped activated carbon. The method uses ammonium carbonate solution or ammonium bicarbonate solution as raw material, and in a continuous flow reactor, the above-mentioned catalyst catalyzes the hydrogenation of ammonium carbonate or ammonium bicarbonate to synthesize formate. The formate is then dehydrated to obtain formamide. The catalyst of this invention has advantages such as high activity and high stability, and can efficiently and stably produce ammonium formate in a continuous flow reactor, which can then be further dehydrated to obtain formamide, thus providing a green, low-carbon, and safe method for the synthesis of formamide.

Process for producing ammonium carbonate ((NH4)2CO3) and sodium carbonate (Na2CO3) in an electrolyzer comprising an hydrogen depolarized anode, by feeding a base chamber of the electrolyzer with an aqueous solution comprising ammonium chloride (NH4Cl), sodium chloride (NaCl), dissolved carbon dioxide (CO2) and obtaining an outlet solution from the base chamber comprising ammonium carbonate ((NH4)2CO3) and sodium carbonate (Na2CO3).

This invention discloses a high-entropy rare-earth silicate ceramic powder and its preparation method. A flocculent precipitate is obtained through in-situ chemical co-precipitation via both forward titration (adding ammonium carbonate solution to a precursor solution) and reverse titration (adding the precursor solution to an ammonium carbonate solution). This precipitate is then repeatedly washed, dried, and calcined at high temperature to prepare a monoclinic high-entropy silicate powder. This invention arbitrarily selects five trivalent lanthanide rare-earth elements with different ionic radii and dissolves them into the high-entropy rare-earth silicate lattice, thereby significantly increasing the configurational entropy and lattice distortion of the sample, enhancing the phase structure stability, and resulting in a resonant frequency temperature coefficient closer to 0 ppm / ℃. The bulk sample of the high-entropy rare-earth silicate ceramic powder, after pressing and sintering, has a relative permittivity of 9.82~10.31, which meets the requirements for microwave dielectric ceramics in millimeter-scale communication.

This invention provides an environmentally friendly method for preparing a carpacacininib intermediate, belonging to the field of pharmaceutical intermediate technology. The method discloses an oxidation reaction of N-Boc-4-hydroxypiperidine as the starting material, yielding compound 2 under the action of an oxidant and a buffer. Compound 2 is then reacted with a cyaniding reagent in the presence of ammonium carbonate via a Bucherer-Bergs reaction to obtain compound 3. Compound 3 undergoes hydrolysis in an alkaline system at 80–110°C to obtain compound 4. Compound 4 is then reacted with di-tert-butyl dicarbonate to perform a Boc protecting group reaction, yielding the carpacacininib intermediate. This invention provides a method suitable for green and environmentally friendly industrial production to obtain the carpacacininib intermediate. This method avoids the use of highly toxic substances and precious metal catalysts, and achieves continuous reaction, thereby improving reaction efficiency and stability and reducing the formation of by-products. The overall yield of the four-step reaction can reach over 70%, and the product purity can reach over 99.4%.

This invention provides a method for preparing nano-calcium carbonate, comprising the following cyclical processes: (1) pretreatment of dry carbide slag raw materials; (2) leaching Ca from the dry carbide slag with ammonium chloride solution. 2+ And perform solid-liquid separation to obtain a high-purity calcium chloride solution and ammonia. (3) Use the ammonia in (2) to absorb low-concentration CO2 flue gas to obtain a mixed solution of ammonium carbonate and ammonium bicarbonate; (4) Mix the mixed solution of ammonium carbonate and ammonium bicarbonate obtained in (3) with the calcium chloride solution obtained in (2) to obtain calcium carbonate precipitate and ammonium chloride solution; (5) Use the ammonium chloride solution obtained in (4) to evaporate and concentrate, and return to step (2) to complete the entire cycle process. This method uses the escaped ammonia produced by the traditional ammonium chloride leaching CO2 to dry carbide slag to absorb flue gas to prepare ammonium carbonate and ammonium bicarbonate. It not only achieves efficient conversion of low-concentration flue gas CO2, significantly reduces conversion costs, and improves economic feasibility, but also uses the high-concentration ammonium carbonate of the conversion product to produce nano-CaCO3, which has significant environmental and economic benefits.

The application provides a preparation method of an electrode foil, comprising the following steps: providing an unformed foil, wherein the unformed foil comprises an aluminum foil substrate and an aluminum powder sintering layer which is combined on at least one surface of the aluminum foil substrate; sequentially performing primary formation, secondary formation, tertiary formation, quaternary formation and quinary formation on the unformed foil; wherein the formation solution of the primary formation, the secondary formation and the tertiary formation is an aqueous solution containing boric acid, citric acid and citrate or azelaic acid and azelaic acid salt, adipic acid and adipic acid salt; and the formation solution of the quaternary formation and the quinary formation is an aqueous solution containing boric acid and ammonium carbonate or ammonium pentaborate. The electrode foil prepared by the preparation method has a high specific capacity.

This invention discloses a method for preparing low-fluorine, high-purity tantalum pentoxide, relating to the fields of hydrometallurgical processes for tantalum compounds and the preparation of high-purity oxides. The method involves leaching tantalum-containing raw materials using a fluorinated acid system and extracting them with a phosphorus-containing extractant. The tantalum-loaded organic phase is then back-extracted using a fluorine-capturing-complexation-reversal back-extraction system containing ammonium oxalate, ammonium carbonate, ammonia, disodium ethylenediaminetetraacetate, polyethylene glycol 200, and supported fluorine-capturing microspheres. This yields a low-fluorine tantalum-containing back-extraction solution. The solution is then subjected to precipitation, multi-stage washing, drying, and calcination to obtain low-fluorine, high-purity tantalum pentoxide. The supported fluorine-capturing microspheres utilize macroporous adsorption resin microspheres as a carrier, with zirconium-cerium hydroxide active components immobilized through a polydopamine adhesion layer. This allows for simultaneous capture of fluoride ions during back-extraction, reducing fluorine residue in the product, minimizing impurity introduction, and improving product purity and process stability.

This application provides a silicon-carbon anode sheet, its preparation method, and its recycling method, relating to the field of lithium-ion batteries. The silicon-carbon anode sheet includes a current collector, a composite sacrificial layer, and a silicon-carbon coating stacked sequentially. The composite sacrificial layer is made of carbon nanotubes, ammonium carbonate, and an elastic binder. The elastic binder includes sodium carboxymethyl cellulose and / or styrene-butadiene rubber. During normal battery use, the flexibility of the elastic binder and carbon nanotubes buffers the silicon expansion stress to extend cycle life, while the carbon nanotube network ensures electron conduction. When the battery is retired or the electrode sheet is scrapped and recycled, low-temperature heating triggers the decomposition of ammonium carbonate to release gas, causing the composite sacrificial layer structure to break down and the adhesion between the coating and the current collector to disappear, achieving automatic coating detachment and non-destructive separation. This simultaneously solves the two major technical problems of short cycle life and difficulty in powder removal during recycling of silicon-carbon anodes.

The application discloses a method for recovering calcium element in by-product of molecular sieve prepared from blast furnace slag, which comprises the following steps: (1) dissolving ammonium sulfate in sulfuric acid, adding blast furnace slag after heating to 30-100 DEG C, stirring to obtain mixed slurry, and filtering to separate the filtrate and the residue, wherein the residue is washed, dried and ground for use; (2) using the filtrate obtained in step (1) to prepare zeolite molecular sieve; (3) dissolving ammonium carbonate in deionized water, adding the residue obtained in step (1), stirring uniformly, adding magnesium oxide to continue to react for a period of time, filtering, and separating the residue and the filtrate, drying the residue to obtain a solid containing calcium carbonate; evaporating and concentrating the filtrate, drying after crystallization, and grinding to obtain ammonium sulfate. The application realizes harmless comprehensive utilization of blast furnace slag resources, and can maximize the recovery of effective components in blast furnace slag and application in industrial production.

This invention relates to the field of coal seam permeability enhancement technology, and discloses a method and apparatus for multiple fracturing of low-permeability coal seams using a combination of electrical pulses and supersaturated ammonium carbonate solution. The method includes: Step 1, drilling a single-hole long borehole in the coal seam, and then arranging an integrated discharge device within the borehole; Step 2, injecting a high-pressure supersaturated ammonium carbonate ion solution into the borehole, using a data monitoring and control center system to monitor the data within the borehole and control the integrated discharge device to release electrical pulses into the high-temperature, high-pressure conductive medium filling the borehole, thereby fracturing the coal seam and releasing gas; Step 3, after the electrical pulses are repeated 6-8 times, the discharge is stopped, the electrolyte solution is drained, and the integrated discharge device is removed. The single-hole long borehole is then connected to a gas extraction pipeline for gas extraction. This invention is safe, highly efficient, and has wider applicability, possessing urgent practical significance and important technical value.

The application discloses a method for preparing water-soluble organic fertilizer and mineral-based solid organic fertilizer by using coal gangue and biomass. Calcium carbonate, calcium chloride and biomass are used to assist high-temperature calcination and activation of coal gangue. In the process, the heat value of coal gangue and biomass is recycled, the energy cost is reduced, and energy saving and emission reduction are achieved. The activated coal gangue is used to promote the humification of biomass. By adjusting the catalyst, sulfonating agent and pyrolysis parameter, the humification yield is improved, and the property of humic acid is improved. The humic acid is extracted by the ammonium carbonate hydrothermal method to obtain the water-soluble organic fertilizer and the mineral-based solid organic fertilizer. At the same time, CO2 is fixed, and carbon emission is reduced. The obtained fertilizers have good fertilizer efficiency and can effectively promote crop growth. The above process realizes the collaborative resource utilization of coal gangue and biomass solid waste, and has the advantages of green environmental protection, high efficiency and the like.

The application discloses a low interfacial tension high-stable foam system for controlling the mobility of CO2 flooding of thick oil, which comprises 0.05-0.5% of a foaming agent, 0.01-1% of a thick oil active inducer and the rest of water in percentage by mass; the foaming agent is compounded by a non-ionic surfactant and an ionic surfactant at a mass ratio of 5:1-1:5; and the thick oil active inducer is one or more of sodium carbonate, ammonium carbonate, potassium carbonate, sodium hydroxide, sodium tert-butoxide, sodium tetraborate, sodium ethoxide, ethylenediamine, diisopropyl alcohol amine and triethylamine. The application can form high-stable foam in the CO2 channeling channel of the thick oil reservoir containing residual oil, effectively inhibit CO2 channeling and expand the CO2 sweeping efficiency; the application can reduce the interfacial tension between the foam system and the thick oil, and further improve the oil washing efficiency of the thick oil reservoir; and the application can use the thick oil active inducer to enhance the foam system to improve the recovery efficiency and reduce the system cost.

The application discloses a high-temperature-resistant and anti-cracking carbon nanometer plate and relates to the technical field of carbon nanometer composite materials. The carbon nanometer plate is made of water, polyvinyl alcohol, hydrophobic modified silica aerogel powder, fire-retardant white glue, titanium white powder, silicon carbide micro powder, zirconium-oxygen-coated carbon nanometer tube-aluminum oxide composite fiber, boron-silicon-titanium co-doped phenolic-alloplasmic starch-oxidized graphene interpenetrating network adhesive, aluminum-chromium-phosphorus ternary condensed inorganic sol, hexagonal boron nitride nanometer sheet, silane coupling agent and zirconium ammonium carbonate. The carbon nanometer plate has excellent bending strength, thermal shock resistance, high-temperature oxidation resistance and interface bonding strength through fiber coating, organic-inorganic hybrid bonding and multiphase thermal expansion matching design, and the problems of easy oxidation of the existing carbon nanometer plate at high temperature and easy cracking of the existing carbon nanometer plate under thermal stress are solved.

This invention provides a method for preparing rare earth oxides by alkaline leaching and degreasing. The method includes the following steps: providing a rare earth-containing organic phase extract; back-extracting the rare earth-containing organic phase extract using an oxalic acid solution; performing a first solid-liquid separation on the back-extracted product to obtain a crude rare earth oxalate salt; slurrying the crude rare earth oxalate salt to obtain a crude rare earth oxalate salt slurry; adjusting the pH of the crude rare earth oxalate salt slurry using an alkaline ammonium carbonate solution; and performing a second solid-liquid separation to obtain a rare earth-containing complex solution and a solid organic phase; adjusting the pH of the rare earth-containing complex solution to precipitate a solid; acid washing the precipitated solid to obtain a refined rare earth oxalate salt; and calcining the refined rare earth oxalate salt to obtain rare earth oxides. This invention achieves the separation of rare earth elements and organophosphorus compounds by the principle of complexation and dissolution of rare earth oxalate with an alkaline ammonium carbonate solution and the colloidal precipitation of an acidic organophosphorus extractant in an alkaline solution, thereby obtaining high-purity rare earth oxides.

This invention belongs to the field of energy conservation, emission reduction, and comprehensive resource utilization technology in the coking industry, specifically involving a process for preparing industrial-grade ammonium carbonate using ammonia water and flue gas carbon dioxide, which are byproducts of the ammonia stripping section in coking. The invention uses 20% concentration ammonia water (byproduct of the ammonia stripping section) and carbon dioxide purified from coking flue gas via pressure swing adsorption as raw materials. These materials react in a carbonation tower under low temperature (0-10℃) and slightly positive pressure conditions to generate an ammonium carbonate solution. This solution is then concentrated to 50% concentration by low-temperature evaporation at 60-70℃, followed by crystallization, centrifugation, and drying with hot air at 70℃ to obtain industrial-grade solid ammonium carbonate. The condensate generated during evaporation and crystallization is recycled to the remaining ammonia water tank, achieving a closed-loop system circulation. This invention realizes in-situ coupling and high-value utilization of ammonia and carbon resources in coking enterprises, simultaneously achieving carbon sequestration and reduction.

This invention discloses a perming composition based on thermosensitive regulation, comprising the following components: an aqueous phase including disodium EDTA, urea, glycerin, methylparaben, propylparaben, and phenoxyethanol; a reducing buffer phase including cysteine ​​hydrochloride, cysteine, sodium bicarbonate, ammonium carbonate, and ammonia; an emulsified oil phase including caprylic / capric triglyceride, polydimethylsiloxane, sodium lauroyl glutamate, cocamidopropyl betaine, and PEG-40 hydrogenated castor oil; an active repair phase including phosphatidylcholine, hydrogenated lecithin, ceramide, tocopherol, ascorbyl palmitate, ethoxydiethylene glycol, p-hydroxyacetophenone, and 1,2-hexanediol; a conditioning and repair phase including hydrolyzed keratin, arginine, methylisothiazolinone, and a daily fragrance; and the remainder being deionized water. This invention simplifies the judgment and operation process of softening through the synergistic effect of thermosensitive regulation and the cysteine-based reducing system. This invention also includes a method for preparing the perming composition.

The application provides a method for preparing high-purity zinc compounds by using secondary zinc oxide, and belongs to the technical field of metal smelting. The method comprises the following steps: taking secondary zinc oxide as raw material, preparing a crude zinc sulfate solution through pre-washing and sulfuric acid leaching, removing fluorine ions by using an aluminum-based composite fluorine removal agent, and regenerating the fluorine removal residue containing aluminum-fluorine complexes by using ammonia water, so that the fluorine is transferred into a liquid phase and the aluminum is restored into an active phase of aluminum hydroxide; the regenerated wet filter residue is directly returned to the fluorine removal process for recycling; the regenerated liquid is added with a calcium source to generate calcium fluoride and recover ammonia; meanwhile, low-fluorine solution is subjected to calcium removal by using ammonium carbonate, and then is subjected to electrodialysis dechlorination; after purification, alkali zinc carbonate is precipitated by using ammonium bicarbonate; the mother liquor is stabilized by using ammonium phosphate to stabilize residual calcium, fluorine and heavy metals, and is then resourceized into an ammonium sulfate byproduct; and high-purity zinc oxide powder is obtained by washing, drying and thermal decomposition of the alkali zinc carbonate, and can be used in the fields of piezoresistors, external antibacterial preparations and ceramic glazes.

The application provides a modification method of a secondary battery positive electrode material, a modified positive electrode material and a secondary battery, and the modification method comprises the following steps: S1, dissolving a chemical modifier in a solvent to obtain a chemical modifier solution; the chemical modifier is one or more of urea, urotropin, thiourea, acylurea, selenourea, thioacetamide, phosphorotriamide, ammonium carbonate, ammonium bicarbonate, ammonium chloride, sodium amide, ammonium acetate, ammonium oxalate, amino acid, protein and biological glue; S2, dispersing a metal oxide positive electrode material in the chemical modifier solution to obtain a dispersion liquid; S3, performing a solvothermal reaction on the dispersion liquid, and after the reaction is completed, the obtained product is washed and dried; and S4, performing a heat treatment on the dried product in an oxygen or air atmosphere, and after the heat treatment is completed, a modified positive electrode material is obtained. The method discards the traditional chemical modifier and treatment method, and has the advantages of simple process flow, low raw material cost and universal application.

The application discloses a kind of cobalt carbonate product and its preparation method and application, belong to cobalt carbonate material technical field.It is prepared and includes: adding cobalt salt solution and ammonium bicarbonate solution or ammonium carbonate solution to bottom liquid for seed synthesis, then carry out crystal nucleus growth;The value of inhibiting agglomeration index A in seed synthesis stage is 3~21.5, the value of nucleation driving index N is 3~7.5;A=(ω 2 ×T×t) / (C×Q), N=[(45-|T-45|)×C0×V0] / (C×Q×t).By controlling the value of A and N in the above range, it can be ensured that the whole seed synthesis stage is maintained in a moderate and stable supersaturation environment, so that the nucleation process can be continued, smooth and synchronized, and the prepared seed has excellent monodispersity. As a template for epitaxial growth, a high-quality cobalt carbonate product with high sphericity, narrow particle size distribution, regular morphology and good product consistency can be efficiently and stably obtained.

The application provides a kind of based on gas expansion soybean urease activity rapid detection device and detection method.The detection device main body includes reaction cavity, piston, piston rod, scale mark, sample port, base and end cover.The reaction cavity is cylindrical cavity, bottom closed, top open, inside bottom pre-package dry solid acid and urea;The piston is arranged in the reaction cavity, initial position close to the upper side of medicine powder, can slide up under the action of gas pressure;The piston rod is fixedly connected with the piston, extends upward along the axial direction;The scale mark is arranged on the right side of the front of reaction cavity, 0 scale is located at the bottom and the top of piston is aligned;The sample port is arranged at the right side of the bottom of the front of reaction cavity, with medicine powder at the same height, for injecting the enzyme liquid to be measured;The base is arranged at the bottom of the reaction cavity, for fixed support;The end cover is arranged at the end of piston rod.During detection, the enzyme liquid to be measured is injected into the reaction cavity from the side, urease decomposes urea to generate ammonium carbonate, ammonium carbonate reacts with solid acid to release carbon dioxide gas, gas expansion pushes the piston to move upward, according to the displacement distance of piston after fixed time, the urease activity is determined by comparing with standard curve.The application converts enzymatic reaction into intuitive mechanical displacement, is not interfered by sample color and turbidity, has simple structure, low cost, and is suitable for soil reinforcement engineering site rapid detection.

The application provides a powdery denitration agent and a preparation method thereof. The denitration agent comprises a main agent and a compound auxiliary agent, and the mass percentage of the main agent is not less than 97.5%. The main agent comprises ammonium bicarbonate 25%-30%, ammonium carbonate 35%-40% and ammonium carbamate 27.5%-35%. The denitration agent comprises ammonium bicarbonate 25%-30%, ammonium carbonate 35%-40% and ammonium carbamate 27.5%-35% as the main agent, and the powdery denitration agent prepared by scientifically matching the main agent with the compound auxiliary agent has excellent performance, meets the application requirements of engineering denitration, and solves the problems of poor compatibility of various ammonium salts and insufficient adaptability of the auxiliary agent.