12 results about "Diammonium carbonate" patented technology

The application discloses a preparation method of a binary transition metal aluminide nanocatalyst and application thereof. First, a mixed metal salt solution is mixed with an ammonium carbonate solution to obtain a metal oxide precursor through co-precipitation. Then, the oxide precursor is mixed with a low-temperature composite molten salt and is subjected to thermal reduction under a specific atmosphere. Through simple post-processing, a single-phase binary transition metal aluminide nanocatalyst with high catalytic activity is obtained. The non-noble metal aluminide nanocatalyst prepared is applied to a reaction of catalytically selectively hydrogenating acetylenes to prepare olefin compounds. Under mild conditions, 99% conversion of reactants is achieved while maintaining 96% olefin selectivity. Compared with a traditional supported catalyst, the metal aluminum atom greatly regulates the electronic and geometric structures of the transition metal atom, effectively improves the catalytic activity, and significantly improves the structural stability of the catalyst. The material has high phase purity, is easy to separate and recycle, and has good application prospect.

This invention relates to a method for recovering ammonium components during the production of sodium bicarbonate from sodium sulfate, belonging to the field of chemical production technology. The recovery method includes: pretreating a crystallization mother liquor containing sodium sulfate, ammonium sulfate, ammonium bicarbonate, and diammonium carbonate, then mixing it with sodium sulfate and crystallizing to obtain a liquid-solid mixture; separating fine particles from coarse crystals in the liquid-solid mixture to obtain a coarse crystal slurry and a slurry containing fine particles, respectively; performing solid-liquid separation on the obtained coarse crystal slurry to obtain a double salt and a filtrate; and mixing the obtained double salt with a solution for washing to obtain solid sodium sulfate and a solution of ammonium sulfate. The recovery method provided by this invention has advantages such as a short process flow, simple operation, and no environmental pollution risk. This method not only avoids high-temperature ammonia stripping and low-temperature freezing processes, reducing investment and operating costs and energy consumption, but also improves the ammonia recovery rate and enhances raw material utilization efficiency.

The present application relates to a positive electrode material, a method for preparing same, and use thereof. The method of the present application comprises the following steps: providing a metal salt solution comprising Ni2+, Co2+, Mn2+, and Al3+; dropwise adding a precipitant solution to the metal salt solution, so as to give a lactate precursor, the precipitant solution comprising lactic acid and ammonium carbonate; and co-sintering the lactate precursor and a lithium source. The method of the present application can achieve precise control of the molar proportions of nickel, cobalt, manganese, and aluminum to prepare a positive electrode material having a qualified chemical composition.

The invention discloses a prime coat copper foil for improving stripping and cycle performance of a negative pole piece and a preparation method of the prime coat copper foil, and relates to the technical field of current collectors. The preparation method comprises the following steps: adding magnesium lithium silicate and ammonium carbonate into prime coating slurry, and then coating a copper foil with the prime coating slurry to obtain a prime-coated copper foil; after surface carboxyl of magnesium lithium silicate and oxygen-containing groups of polyacrylic acid are compounded, a large number of high-strength hydrogen bonds are formed, and when a negative electrode generates huge expansion stress in the circulation process, a hydrogen bond network between magnesium lithium silicate nanosheets and a polymer is broken, absorbs energy and buffers the structural change of an active material, so that the circulation performance of a battery end is improved; ammonium carbonate is heated and decomposed into NH3 and CO2, gas escapes and leaves nanoscale pores in the coating, on one hand, the gas can generate a stronger anchoring effect with a negative electrode active material to improve the stripping force of a pole piece, and on the other hand, the pores can serve as buffer pores to inhibit volume expansion of silicon particles during lithium intercalation and improve the cycle performance.

The invention provides a preparation method of an ammonia zinc carbonate crystal, and belongs to the technical field of abnormal mechanical materials, a solvent, zinc acetate and urea are subjected to a solvothermal reaction, cooling and separation are performed after the reaction is finished, and the ammonia zinc carbonate crystal is obtained.The invention provides an efficient, controllable and low-cost ammonia zinc carbonate single crystal synthesis route. A solvothermal method of a specific mixed solvent is adopted, urea controllable hydrolysis is utilized, growth of crystals of a specific spiral chain structure is achieved under the mild condition, stable, reversible and linear negative linear compression (NLC) behaviors are shown in the wide pressure range of 0-5 GPa, the key technical bottlenecks that an existing NLC material is narrow in pressure range and responds to nonlinearity are solved, and the preparation method is suitable for industrial production. An ideal solid molecular spring material is provided for high-pressure precision sensing and driving; the method is simple in process and good in repeatability, and a reliable and high-quality material source is provided for subsequent research and application.

The invention discloses a method for preparing battery-grade lithium carbonate based on a continuous flow coupling micro-reaction system. The method adopts an ammonia process path and comprises the following steps: firstly, introducing carbon dioxide into a micro-channel reactor to react with ammonia water to generate an ammonium carbonate solution; and continuously injecting the ammonium carbonate solution and the lithium chloride solution into an autonomously designed continuous flow dynamic microreactor. The continuous flow dynamic micro-reactor effectively crushes separated solid particles through shearing force generated by high-speed stirring inside, the problem that a traditional micro-reactor is easy to block is solved, and long-term stable continuous operation of a solid-containing system is realized. The particle size distribution and the impurity content of lithium carbonate can be accurately controlled by adjusting the reaction temperature, the stirring speed, the anti-solvent proportion and the raw material ratio. The purity of the prepared lithium carbonate is higher than 99.5 wt%, sodium ion pollution is avoided, and the method has the advantages of being efficient, high in automation degree, environmentally friendly and the like and has remarkable industrial application prospects.

The invention relates to the technical field of mural manufacturing, and discloses a manufacturing process of an improved draining powder gilding mural, which comprises the following steps: preparing a substrate, mixing modified draining powder base stock paste and a crosslinking activating solution to prepare paste for construction, extruding three-dimensional lines, standing and curing, and gilding for protection. The modified draining powder base stock paste is prepared from silane modified lithopone, a polyvinyl acetate emulsion, a golden styrene-acrylate copolymer emulsion and hydroxypropyl methyl cellulose; the crosslinking activating solution is prepared from ammonium zirconium carbonate, 2-amino-2-methyl-1-propanol and a solvent. According to the invention, the rheological stability is maintained in the mixing period by utilizing a volatile alkali regulated zirconium latent crosslinking mechanism, and the crosslinking reaction is triggered along with amine volatilization after extrusion. According to the process, the problems of drying shrinkage cracking, sagging deformation and poor water resistance of a traditional draining powder line are effectively solved, and the shape maintaining property, hardness and substrate adhesive force of the line are improved.

The application relates to the technical field of inorganic porous materials, and particularly discloses a preparation method of pseudo-boehmite for chloromethane. The preparation method comprises the following steps: S1: adding a sodium-free aluminum salt, zirconium nitrate pentahydrate and tetrabutyl titanate into a mixed solvent, adding a complexing agent, then adding nano-boehmite, uniformly mixing, adjusting the pH value to 7.5-8.0, increasing the temperature to 25-35 DEG C, mixing, adjusting the pH value to 5.5-6.0, mixing, and obtaining a uniform sol; S2: mixing urea and ammonium bicarbonate in water, adding zirconium ammonium carbonate, and obtaining a mixed solution B; S3: adding the mixed solution B into the uniform sol, uniformly mixing, performing gradient temperature reaction, performing solid-liquid separation, washing, drying, and obtaining the pseudo-boehmite for chloromethane. The pseudo-boehmite for chloromethane prepared by the application has extremely low sodium content, high specific surface area and excellent thermal stability.

The invention discloses a method for removing copper particles in a positive electrode material of a lithium ion battery based on ammonium-oxygen synergy. The method comprises the following steps: mixing a nickel-cobalt-manganese ternary positive electrode material of a retired lithium ion battery containing the copper particles with ammonium carbonate; oxygen-containing gas is introduced for a leaching reaction, and copper particles in the positive electrode material are selectively complexed to form soluble complex tetraamminecopper ions; and carrying out solid-liquid separation to obtain the positive electrode material without the copper particles. According to the invention, the self-buffering capability of ammonium carbonate in a specific pH range is utilized, tetraamminecopper ions are formed based on the synergistic effect of ammonium and oxygen, and valuable metal elements such as nickel, cobalt, manganese and the like do not form soluble ammonia complexes under the pH condition and are precipitated in the form of carbonate, oxide or hydroxide, so that efficient separation of copper and the positive electrode material is realized; the method has the advantages of high copper removal efficiency, good selectivity, pH self-buffering, environmental friendliness and the like.

The present invention provides a hair treatment agent that can suppress the decrease in hair strength (firmness, resilience, resistance to breakage, and combability) caused by dyeing and bleaching treatments, while simultaneously suppressing the generation of unpleasant odors in the hair caused by these treatments. [Solution] A hair treatment agent used in mixture with a second agent containing hydrogen peroxide, comprising a carboxylic acid or a salt thereof and an alkaline agent, wherein the carboxylic acid is tartaric acid, the content of the carboxylic acid or salt thereof is 0.001 to 5% by mass, the alkaline agent is at least one selected from the group consisting of ammonia, diethanolamine, and aminomethylpropanol, and further contains a pH buffer, the pH buffer is a carbonate selected from the group consisting of ammonium bicarbonate, ammonium carbonate, sodium bicarbonate, sodium carbonate, potassium bicarbonate, and potassium carbonate, and the pH is 8.5 to 11.5.

The application provides a copper plate paper and cigarette paper thereof, and the copper plate paper comprises a base paper, a first coating layer, a second coating layer and a third coating layer; the base paper comprises a front surface and a back surface arranged oppositely; the first coating layer is coated on the front surface of the base paper; the second coating layer is coated on the back surface of the base paper, wherein the material of the second coating layer is selected from at least two or more combinations of sodium carboxymethyl starch, carboxymethyl cellulose, polyvinyl alcohol, AZC type (zirconium ammonium carbonate) adhesive and multi-active functional group high cross-linking type water resistance agent; and the third coating layer is coated on the second coating layer. The copper plate paper provided by the embodiment of the application can maximally inhibit the problem of inaccurate printing or gold blocking caused by shape stability of non-fluorescent cigarette paper single copper during printing and post-processing. The non-fluorescent cigarette paper single copper can fully meet the requirements of the current cigarette packaging market, increasingly exquisite and complex printing and subsequent processing quality.

The invention discloses a preparation method of a self-assembled high-performance spherical lithium cobalt oxide positive electrode material of a lithium ion battery. The preparation method comprises the following steps: (1) complexing and mixing: mixing a cobalt source and complexing agent raw material powder; the cobalt source is cobalt sulfate heptahydrate, cobalt nitrate hexahydrate or cobalt chloride; the complexing agent is one or more of ammonia water, ammonium carbonate, urea, ethylenediamine tetraacetic acid, citric acid monohydrate or anhydrous oxalic acid; (2) a precipitation reaction and aging step: adding a precipitator into the mixture obtained in the step (1); the precipitant is sodium carbonate, sodium hydroxide, sodium bicarbonate, potassium carbonate, potassium hydroxide or a combination thereof; and (3) a post-treatment step: washing the initial precursor with deionized water, filtering, drying to obtain cobalt precursor powder, mixing the obtained cobalt precursor with a lithium source, and roasting to obtain the lithium cobalt oxide positive electrode material. According to the invention, the raw material cost is reduced, the operation steps are simplified, the product yield is improved, and the low-cost and high-performance lithium cobalt oxide positive electrode material with the spherical structure can be prepared.