94 results about "Potassium carbonate" patented technology

The application provides a method for synthesizing an eplerenone intermediate N-1 by one-pot method, and belongs to the technical field of organic synthesis. The method is characterized in that: the eplerenone intermediate N-4 is dissolved in dichloromethane, a potassium carbonate aqueous solution and dibromohydantoin are added to perform an opening ring reaction; after the reaction is completed, hydrochloric acid is directly added to perform a rearrangement reaction; then water is separated and methanol is added in the organic layer to perform an ozonation reaction; then sodium sulfite is added to perform a reduction reaction; then hydrochloric acid is added to perform a methyl esterification reaction, so as to obtain the eplerenone intermediate N-1 crude product, and finally the eplerenone intermediate N-1 fine product is obtained through refining. The method realizes the one-pot synthesis of the eplerenone intermediate N-1 from the eplerenone intermediate N-4 through the continuous reactions of opening ring, rearrangement, ozonation, reduction and methyl esterification, and can avoid column chromatography purification, so that the method becomes a green chemical process route with greatly reduced organic solvent consumption and wastewater.

This invention belongs to the field of glass technology and relates to a high-temperature resistant structural glass material, its preparation method, and its applications. The glass is composed of the following components by mass percentage: 60%-70% silicon dioxide, 5.5%-11% boric acid, 0.1%-5% aluminum hydroxide, 0%-3% potassium nitrate, 5.5%-13% potassium carbonate, 0%-12% sodium carbonate, 0.1%-4% calcium carbonate, 0%-2% calcium fluoride, 0%-1% lithium carbonate, 0%-2% basic magnesium carbonate, 0.1%-1% titanium dioxide, 0%-2% zirconium dioxide, and 0%-1% cerium dioxide; the total mass percentage of potassium nitrate, potassium carbonate, sodium carbonate, and lithium carbonate does not exceed 22%. This structural glass possesses a high softening temperature, a suitable coefficient of thermal expansion, high-temperature resistance, thermal shock resistance, and processing performance, making it suitable as a structural material for optoelectronic devices.

Provided is a synthesis method for azoxystrobin, comprising: in a water-oil system of an organic solvent and an aqueous solution of trimethylamine, a compound represented by formula I reacts with 2-cyanophenol to obtain azoxystrobin, wherein the molar ratio of the compound represented by formula I to trimethylamine is 1:(0.96-2). The synthesis method has high reaction efficiency, does not produce CO2, avoids the risks of entrainment and overflow, reduces the generation of side reactions and solid waste emissions and is environmentally friendly. In addition, the method does not require the use of solid sodium carbonate or potassium carbonate, and the material reaction system is an oil-water reaction system, so that the reaction efficiency is greatly improved, and the yield can also be maintained at 95% or more, thereby taking both the efficiency (timeliness) and the yield into account and easily achieving continuous reaction, and thus providing technical support for intelligent and unmanned production. Moreover, since trimethylamine can be recycled, the use of one raw material is reduced, and further there is no need for complicated treatment for mixed salts and waste water thereof, thereby significantly reducing the energy consumption.

This application belongs to the field of inorganic chemical waste recycling and fluoride preparation technology, specifically relating to a method for preparing potassium fluorotitanate from hydrofluoric acid waste liquid. The method includes: S1. Pretreatment of hydrofluoric acid waste liquid and titanic acid powder; S2. Adding the pretreated hydrofluoric acid waste liquid and titanic acid powder to a reaction vessel to generate a fluorotitanic acid solution; S3. Adding potassium carbonate to the fluorotitanic acid solution to generate potassium fluorotitanate, followed by purification of the reaction solution to obtain potassium fluorotitanate crystals; S4. Washing and drying the potassium fluorotitanate crystals to obtain a high-purity potassium fluorotitanate product. This application uses titanic acid powder as the titanium source and optimizes reaction parameters to achieve the dual goals of resource recovery from hydrofluoric acid waste liquid and low-cost preparation of high-purity potassium fluorotitanate.

This invention provides a method for manufacturing supercapacitor carbon materials that can improve safety during the preparation of supercapacitor carbon materials by inactivating highly flammable alkali metals into safe potassium carbonate. [Solution] The manufacturing method includes the steps of: (A) applying a first heat treatment to heavy oil to form a soft carbon precursor structure having a mesophase structure ratio exceeding 50%, a quinoline insoluble content of 95% to 98%, and a toluene insoluble content of 89% to 91%; (B) polishing and classifying the soft carbon precursor structure, then mixing it with an activator and an inactivator to form a mixture; (C) performing activation and carbonization treatments; (D) removing residual activator, neutralizing it by pickling and washing with water, and then drying it at 90°C for at least 16 hours to obtain an activated carbon material; and (E) applying a second heat treatment to the activated carbon material to form a supercapacitor carbon material.

This invention discloses a method for preparing 4-(trifluoromethylsulfinyl)pyrazole compounds, comprising: dissolving terminal alkyne in n-hexane under nitrogen atmosphere, adding anhydrous zinc chloride, and reacting trifluoromethylsulfinyl chloride to obtain α-trifluoromethylalkynyl sulfoxide; adding benzoyl chloride dropwise to a CH2Cl2 solution of phenylhydrazine and triethylamine under nitrogen atmosphere to obtain acylhydrazine; adding carbon tetrachloride to a suspension of acylhydrazine and triphenylphosphine in acetonitrile to obtain hydrazone chloride; and reacting α-trifluoromethylalkynyl sulfoxide, hydrazone chloride, potassium carbonate, and anhydrous ethanol at room temperature to obtain 4-(trifluoromethylsulfinyl)pyrazole compounds. This invention uses inexpensive and readily available raw materials, the entire reaction route is mild and simple to operate, does not require stringent reaction conditions, and most of the reaction process is carried out at room temperature. The product yield is high, and the prepared trifluoromethylalkynyl sulfoxide pyrazole structure has multiple derivatization sites, showing good application prospects.

This invention discloses a method for synthesizing potassium 4-methoxysalicylate based on supramolecular-assisted methylation, belonging to the field of organic synthesis technology. The process is based on supramolecular chemistry principles and includes the following steps: (1) Preparation of a macrocyclic host molecule-methylating agent complex loaded with a methylating agent: The macrocyclic host molecule and the methylating agent are reacted at pH 7-9 and 25-40℃ to form a complex solution; (2) One-pot preparation of the target product: 2,4-dihydroxybenzoic acid is salted with potassium hydroxide, potassium carbonate is added, and the above complex solution is added dropwise. A selective methylation reaction is carried out at 55-65℃. After the reaction is complete, post-treatment yields the product. This invention utilizes the molecular recognition function of the macrocyclic host to achieve highly selective methylation of the 4-hydroxyl group under mild conditions. This process has the advantages of simple operation, high safety, low waste, and recyclable host molecules. The yield of potassium 4-methoxysalicylate can reach over 85%, and the purity exceeds 99.0%.

This invention provides an N,N-diethylpyrrolidine difluorosulfonylimide salt, its preparation method, and its applications, belonging to the field of ionic liquid materials technology. The preparation method of the N,N-diethylpyrrolidine difluorosulfonylimide salt of this invention includes the following steps: reacting potassium carbonate solution, tetrahydropyrrole, and bromoethane in an inert atmosphere; then dissolving the reaction product in an organic solvent, filtering, and evaporating to obtain N,N-diethylpyrrolidine bromide; dissolving the N,N-diethylpyrrolidine bromide in water, adding activated carbon for decolorization treatment, to obtain an aqueous solution of N,N-diethylpyrrolidine bromide; and subjecting the aqueous solution of N,N-diethylpyrrolidine bromide to an ion exchange reaction with lithium difluorosulfonylimide in an organic solvent to obtain the final product. The preparation method of this invention separates the reaction product and byproduct into liquid and solid phases, and the reaction does not introduce other impurity ions, greatly improving the purity of the product.

A method for preparing aryl-substituted alcohols, belonging to the field of organic synthesis. This invention solves the problem that existing visible light photocatalytic reactions for constructing carbon-carbon bonds by reversing the polarity of the C=O double bond require expensive and environmentally harmful metal photocatalysts. Method: Aromatic aldehydes, 4-cyanopyridine, tetrabromofluorescein, thiourea dioxide, potassium carbonate, and an organic solvent are mixed, followed by light irradiation. This invention is used for the preparation of aryl-substituted alcohols.

This invention provides a multilayer coated low-temperature carbon capture material, its preparation method, and its application. The preparation method employs a four-layer sandwich multilayer coating process: a mixed slurry-alumina slurry-mixed slurry-alumina slurry. A mixed slurry coating (active layer), an alumina slurry coating (bonding transition layer), a mixed slurry (active layer), and an alumina slurry (protective layer) are sequentially formed on the surface of a porous honeycomb carrier. The transition layer and protective layer formed by the alumina slurry enhance the bonding strength between the active ingredient (potassium carbonate) and the carrier, while preventing the active ingredient from directly contacting external moisture, reducing potassium carbonate shedding during cycling, and ensuring stable carbon capture performance during multiple adsorption-desorption cycles. The multilayer thin-coating method ensures the effective loading of the active ingredient and avoids cracking and peeling caused by excessive internal stress in thick coatings, thus improving the overall stability of the coating.

The present invention relates to the technical field of concrete materials. Disclosed are a modified epoxy resin and a preparation method therefor, a composition for an epoxy resin grouting material, an epoxy resin grouting material, a preparation method therefor, and a use thereof. The method for preparing the modified epoxy resin comprises: heating a polyhydroxy compound and an epoxy resin at 80-100ºC in a nitrogen atmosphere in the presence of a catalyst to obtain the modified epoxy resin, wherein the molar ratio of the polyhydroxy compound, the epoxy resin, and the catalyst is 1:1-2:0.05-0.1; the epoxy resin is a bisphenol A epoxy resin; the catalyst is selected from any one of sodium hydroxide, potassium carbonate, and dimethylaniline; and the polyhydroxy compound is selected from at least one of glycerol, ethylene glycol, propylene glycol, glucose, and butylene glycol. The epoxy resin grouting material of the present invention has more excellent toughness and lower viscosity, and good bonding strength and bonding durability with a concrete matrix.

This invention provides a synthesis process for olafron and its application, comprising the following steps: mixing a solvent, octadecylamine, and triethylamine, then pumping the mixture with 2-bromo-1-ethanol into a continuous flow reactor; extracting the reaction solution after the reaction and purifying it to obtain OLF-A1; mixing OLF-A1, a solvent, and potassium carbonate, heating the mixture and adding 3-bromo-1-chloropropane to react; extracting the reaction solution after the reaction and purifying it with silica gel to obtain OLF-A2; mixing OLF-A2, a solvent, and potassium carbonate, heating the mixture and adding diethanolamine; extracting the reaction solution after the reaction and purifying it to obtain OLF-A3; mixing OLF-A3 and a dehydrating agent, then adding hydrofluoric acid, heating and stirring, concentrating the mixture, and purifying it to obtain the finished product, olafron. This invention solves the problems of excessive impurities and low yield in conventional processes by optimizing the reaction apparatus and purification methods for intermediate synthesis, providing technical support for the efficient synthesis of olafron.

The application provides a preparation method of N-tert-butyl-3-aminoindole derivatives, and the specific steps are as follows: 1) mixing compound IV, N-propyl-4-methylbenzenesulfonamide, copper sulfate pentahydrate, 1,10-phenanthroline, potassium carbonate and a first solvent, after reaction, post-treatment is performed to obtain compound II; 2) mixing tert-butylamine, triethylenediamine, di-tert-butyl dicarbonate, dichloromethane at room temperature, and after reaction for 12 hours, N,N-di-tert-butyl urea is obtained; further reaction of the N,N-di-tert-butyl urea is performed to obtain compound III; 3) mixing compound II, compound III, iodobenzene, a palladium catalyst, a biphosphine ligand, a base and a second solvent, and after reaction, the N-tert-butyl-3-aminoindole derivative with the structural formula of the application can be directly subjected to amination and ring reaction with iodobenzene in one-pot reaction.

An automatic dishwashing detergent composition suitable for auto-dosing into an automatic dishwashing appliance is provided. The composition includes at least one liquid component that is contained within a water insoluble packaging. The at least one liquid component includes potassium carbonate, builder selected from citric acid and / or salts thereof, methylglycine-N,N-diacetic acid and / or salts thereof (MGDA), glutamic acid diacetic acid and / or salts thereof (GLDA), and any combination thereof, and water. The at least one liquid component has a pH of greater than 8.0.

This invention discloses a highly efficient method for synthesizing proxalutamide intermediates, belonging to the field of pharmaceutical synthesis technology. First, dimethyl malonate and 2-chloro-5-nitropyridine are used as raw materials, condensed in the presence of potassium carbonate to generate dimethyl 2-(5-nitropyridine-2-yl)malonate. This is then reacted with tert-butyl acrylate and acid-hydrolyzed to obtain 4-(5-nitropyridine-2-yl)butyric acid. After activation with N,N'-carbonyl diimidazole, it is coupled with aminoacetaldehyde dimethyl acetal to form N-(2,2-dimethoxyethyl)-4-(5-nitropyridine-2-yl)butyramide. Then, a cyclization reaction mediated by phosphorus pentoxide and methanesulfonic acid is used to generate crude 2-(3-(5-nitropyridine-2-yl)propyl)oxazole. After purification, the nitro group is reduced by catalytic hydrogenation, and finally, it reacts with 1,5-naphthalenedisulfonic acid to form a salt, yielding the proxalutamide intermediate. This method achieves highly efficient synthesis of proxalutamide intermediates.

The application discloses a preparation method of a benzoxathiazinone derivative and belongs to the technical field of organic synthesis. The method uses benzodisulfone and an epoxide compound as reaction raw materials, and under the action of a catalytic system composed of lanthanum nitrate hexahydrate and tributyl phosphine, potassium carbonate is used as an alkali, acetonitrile is used as a solvent, and the reaction is carried out under heating, and then column chromatography is used for separation and purification, so that the target seven-membered sulfur heterocyclic compound is obtained. The synergistic catalytic mechanism formed between the lanthanum nitrate hexahydrate and the organic phosphine effectively overcomes the problem of the regioselective ring opening of the epoxide compound, and realizes the efficient and high-selectivity cyclization of the benzodisulfone and the epoxide compound. The synthetic route has mild reaction conditions, does not need inert gas protection, is simple in operation, and has good functional group compatibility, and provides an efficient and practical technical path for constructing novel benzoxathiazinone derivatives.

This invention relates to the field of piezoelectric materials and discloses a method for preparing a potassium sodium niobate thin film. The method involves first synthesizing a ceramic target material from niobium pentoxide, potassium carbonate, and sodium carbonate in a solid phase; then placing the ceramic target material in a magnetron sputtering apparatus for sputtering to form an amorphous thin film; finally, adding the amorphous thin film to an annealing atmosphere in a crucible for annealing to form a potassium sodium niobate thin film. This method uses magnetron sputtering to prepare an amorphous potassium sodium niobate thin film under conditions below the film crystallization temperature, followed by annealing to crystallize the film. During annealing, an alkali metal atmosphere is used to compensate and control the alkali metal elements in the film. This method is still based on magnetron sputtering, which is suitable for large-size thin film growth, offering strong process controllability and high production efficiency. The alkali metal atmosphere compensation allows for control of the alkali metal element composition in the potassium sodium niobate.

The present invention relates to edible, orally dissolving formulations based on S- adenosylmethionine, anhydrous sodium or potassium carbonate and optionally other active ingredients and excipients.

The present application discloses a synthesis method for azoxystrobin, comprising a step of: reacting a compound of Formula I with 2-cyanophenol in a water-oil system of an organic solvent and an aqueous solution of trimethylamine to obtain azoxystrobin, wherein a molar ratio of the compound of Formula I to trimethylamine is 1:(0.96-2). The synthesis method of the present application has advantages of high reaction efficiency, no CO2 generation, avoidance of the risk of entrained overflow, reduced secondary reactions, reduced solid waste emissions, and environmental friendliness. Use of solid sodium carbonate or potassium carbonate is avoided and the material reaction system is an oil-water reaction system. The reaction efficiency is significantly improved and the yield can reach 95% or above. Both efficiency (timeliness) and yield can be taken into account, and continuous reactions can be realized easily, providing technical support for intelligent, unmanned production.

This invention relates to the field of powder tableting technology, specifically to a method for tableting potassium carbonate powder. The method includes the following steps: (1) dissolving potassium carbonate powder in a solvent to obtain a potassium carbonate solution; (2) spray granulating the potassium carbonate solution to obtain intermediate material; (3) sieving the intermediate material to obtain intermediate material with a particle size of 50-1500 μm, mixing the intermediate material with an organic additive to form a mixture, and then tableting and sintering the mixture. This invention is suitable for continuous automatic tableting of potassium carbonate powder. During the process, adhesion is less likely to occur, avoiding problems such as broken particles, small particle size, and poor strength. The resulting particles have a higher one-time forming rate, a crushing strength of not less than 30 N / particle, and more stable product quality.

This invention discloses a method for preparing an aqueous thermosensitive Cr(III) ion-imprinted polymer, belonging to the field of water pollution treatment technology. The method includes the following steps: (1) dissolving aminated multi-walled carbon nanotubes and potassium carbonate in N,N-dimethylformamide, and adding bromopropylene to obtain vinylated multi-walled carbon nanotubes; (2) dissolving CrCl3·6H2O, a functional monomer, and a thermosensitive monomer in a porous solvent composed of ethanol and water, adding vinylated multi-walled carbon nanotubes, ethylene glycol dimethacrylate, and azobisisobutyronitrile to obtain the Cr(III) ion-imprinted polymer. This invention introduces the thermosensitive functional monomer N-isopropylacrylamide, enabling the ion-imprinted polymer to respond to changes in ambient temperature and accurately identify and adsorb target ions in complex environments. The introduction of the thermosensitive functional monomer allows the polymer to form a hydrophilic layer, reducing non-specific adsorption caused by impurities such as humic acid, and improving the adsorption capacity and selectivity for target ions.

This invention provides a high-temperature stable fluorinated carbon oil displacement surfactant and its preparation method, belonging to the field of surfactant technology. This application constructs a triazine fluorinated surfactant: First, 1H,1H,2H,2H-perfluorooctane-1-ol is used in the presence of anhydrous potassium carbonate to generate a fluorinated alkoxy anion, which forms a C-O bond with cyanuric chloride, introducing a fluorinated hydrophobic arm; then, sodium N-methyltaurate is introduced to N-substitute the unsubstituted chlorine position, introducing a sulfonate hydrophilic head group, obtaining an intermediate of a fluorinated hydrophobic arm and a taurine hydrophilic arm; then, oleylamine is used to replace the remaining chlorine position, introducing a long-chain hydrocarbon hydrophobic arm, forming a surfactant mixture with an O-N-N triazine structure consisting of a "fluorinated alkoxy arm-taurine hydrophilic arm-oleylamine hydrocarbon arm"; after solvent removal and addition to an ethylene glycol monobutyl ether / water co-solvent system, a stable oil displacement surfactant that is easy to prepare and use on-site is obtained.

This application discloses a method for preparing a porous carbon / hydrophobic carbon paper electrode based on paulownia leaves and its application in water decomposition to produce H2O2, belonging to the field of electrochemical synthesis technology. The method uses waste paulownia leaves as a precursor, which are pretreated and calcined at high temperature under a protective atmosphere to obtain raw biochar. This raw biochar is then activated with KOH to obtain paulownia leaf-based porous biochar. This biochar is then mixed with a perfluorinated resin solution and anhydrous ethanol to prepare a catalyst dispersion, which is drop-coated onto a hydrophobic carbon paper substrate containing 20%–80% polytetrafluoroethylene (PTFE) and dried to obtain a composite electrode. This electrode uses hydrophobic carbon paper as a substrate, with a layered porous structure of paulownia leaf-based porous biochar loaded on its surface, exhibiting a specific surface area ≥600 m². 2 / g、I D / I G The value is 0.85~1.05. Using this electrode in a potassium carbonate electrolyte, a two-electron water oxidation reaction with a voltage of 1.5~4V vs. RHE can efficiently synthesize hydrogen peroxide, with an optimal yield of 43.48 mg / L and a Faraday efficiency of 25.32%. This application utilizes green and inexpensive raw materials and a simple process, achieving high-value utilization of biomass waste and providing a reliable solution for the green industrial production of hydrogen peroxide.

The application discloses a florfenicol intermediate and belongs to the technical field of chemical synthesis. By adding aluminum magnesium hydrotalcite composite potassium carbonate as an alkaline catalyst in the preparation process of the florfenicol intermediate, the phenomenon that traditional pure potassium carbonate is easily dissolved and lost in glycerol solvent can be avoided, the prepared florfenicol intermediate has high purity and high yield; the aluminum magnesium hydrotalcite composite potassium carbonate is successively subjected to dimethyl sulfoxide stripping, methanol hydrothermal treatment and hexadecyl trimethyl ammonium bromide intercalation treatment, and modified aluminum magnesium hydrotalcite with a large specific surface area and interlayer spacing is obtained; and the modified aluminum magnesium hydrotalcite is used as a carrier to load potassium carbonate; the modified aluminum magnesium hydrotalcite is a layered structure, and the potassium carbonate is uniformly loaded in the interlayer space and the surface of the hydrotalcite; and the interlayer confinement effect can fix the potassium carbonate, thereby avoiding loss.