24 results about "Corrosive acid" patented technology

The invention discloses a preparation method of high-purity bis (fluorosulfonyl) imide alkali metal salt. The method comprises the following steps: (1) synthesizing bis (chlorosulfonic acid) imide by taking sulfamic acid, chlorosulfonic acid, thionyl chloride and chlorosulfonic acid isocyanate as raw materials; (2) fluorinating the bis (chlorosulfonic acid) imide by ammonium fluoride to obtain bis (fluorosulfonyl) imide ammonium salt; (3) treating the imidodisulfuryl fluoride ammonium salt solution with a strong acid ion exchange column and concentrating under reduced pressure to obtain imidodisulfuryl fluoride; (4) reacting the alkali metal salt with bis (fluorosulfonyl) imide to obtain bis (fluorosulfonyl) imide alkali metal salt; and (5) carrying out a series of purification processes on the bis (fluorosulfonyl) imide alkali metal salt to obtain the high-purity bis (fluorosulfonyl) imide alkali metal salt. The preparation method has the advantages of mild reaction conditions, low danger coefficient in the technological process, easiness in control, no use and generation of corrosive acid, greenness and environmental protection, and high yield and high purity of the bis (fluorosulfonyl) imide alkali metal salt, and is suitable for large-scale industrial application.

The invention relates to a method for green and efficient extraction of lithium from sedimentary clay lithium ore, belongs to the technical field of lithium extraction, and solves the problem that in the prior art, it cannot be guaranteed that high-efficiency extraction of lithium cannot be guaranteed, and meanwhile harm to the environment in the extraction process cannot be reduced. The method comprises the steps that sedimentary clay lithium ore is crushed, ground and sieved, and millimeter-level lithium ore powder is obtained; mixing the millimeter-scale lithium ore powder with a carboxylic acid-based green solvent system, and heating to strengthen leaching to obtain a lithium-containing solid-liquid mixture; the carboxylic acid-based green solvent system is a carboxylic acid solution or a deep eutectic solvent formed by carboxylic acid and choline chloride; and carrying out solid-liquid separation on the lithium-containing solid-liquid mixture to obtain a lithium-rich leachate and mixed slag. According to the method, acid reagents with extremely high corrosivity such as strong acid are not adopted, high-temperature pretreatment is not needed, the requirement for equipment is not harsh, side reactions are reduced, and efficient leaching of lithium in the sedimentary clay lithium ore is achieved under the relatively mild condition.

The invention relates to the technical field of carbon dioxide adsorbents, in particular to a silicon-based / aluminum-based solid amine adsorbent prepared from montmorillonite and a preparation method and application of the silicon-based / aluminum-based solid amine adsorbent. According to the invention, the montmorillonite subjected to acid activation treatment is extracted to obtain the silicon-based nano material with silicon dioxide as a main component. In addition, through step-by-step neutralization treatment on the strongly acidic filtrate, metal ions in the filtrate are successfully extracted and converted into an aluminum-based nano material with aluminum oxide as a main component. The solid amine adsorbent is prepared by taking a silicon-based and aluminum-based composite nano material with high specific surface area and high surface activity as a carrier and combining amino functionalization treatment. According to the method, high-added-value overall utilization of the montmorillonite is achieved, the montmorillonite is converted into a high-capacity and high-selectivity novel trapping material from low-adsorbability minerals, the original acid filtrate with high corrosivity is converted into an environment-friendly sodium chloride neutral solution, and green chemistry and circular economy concepts are practiced.

The present application relates to the technical field of resource recycling, more particularly, it is a kind of waste lithium battery black powder recovery method, comprising the following steps: S1, after mixing photocatalyst, polyhydroxy auxiliary agent, waste lithium battery black powder and water, ultrasonic dispersion treatment is carried out, and mixed solution is obtained;S2, the mixed solution is placed in dark box and is carried out photocatalytic treatment, and after liquid is obtained;S3, the catalyzed liquid is transferred into the closed reaction kettle with stirring function, heated to the subcritical state of water and carried out the preferential extraction of lithium, and after solid-liquid separation, lithium extraction liquid and lithium extraction residue are obtained.The present application realizes the front-end extraction of lithium and the low-acid recovery of transition metal under the premise of not introducing strong corrosive acid and alkali, wherein the leaching rate of lithium can reach more than 99%, and the leaching rate of transition metal can reach more than 98%.

This application relates to a method for preparing Mn-doped CsPbBr3 nanowires. The method comprises: 1) injecting a cesium oleate precursor solution into a mixed solution A, dispersing the resulting precipitate by centrifugation in an oil-phase solvent, and obtaining a CsPbBr3 nanowire seed solution; 2) injecting the CsPbBr3 nanowire seed solution into a mixed solution B to form Mn-doped CsPbBr3 nanowires, cooling the solution, and centrifuging the resulting precipitate. Mixed solution A is prepared by mixing octadecene, oleic acid, oleylamine, and lead bromide, heating the mixture until the lead bromide is fully dissolved, and then cooling the mixture; mixed solution B is prepared by mixing octadecene and manganese bromide and heating the mixture under an inert gas atmosphere. This method provides sufficient thermal energy for the dopant while minimizing Ostwald maturity, allowing the dopant to diffuse into the crystal without the use of highly corrosive acids. While maintaining the nanowire's shape anisotropy and overall dimensional uniformity, it can produce nanowires with ultra-small diameters, making it an effective method for synthesizing Mn-doped CsPbBr3 nanowires.

The invention discloses a method for detecting the content of free carbon in a tungsten-titanium solid solution, and belongs to the field of analytical chemistry. According to the method, based on the adsorption effect of the free carbon on bromothymol blue, an adsorption reaction is carried out in an acidic buffer system, and selective adsorption of the free carbon is realized; and then carrying out solid-liquid separation, alkalifying the filtrate, measuring the absorbance under the wavelength of 574nm, and calculating the content of free carbon by using a standard curve method according to the absorbance difference. The method has the advantages of simplicity and convenience in operation, low cost, no use of strong corrosive acid, environmental friendliness and the like. Compared with a high-frequency infrared method, the precision is remarkably improved, and the method is suitable for rapid and accurate determination of free carbon in the tungsten-titanium solid solution.

The utility model discloses a reaction kettle for producing chemical products, and relates to the technical field of reaction kettles. Comprising a reaction kettle body, a top cover detachably arranged at the top end of the reaction kettle body, two groups of water spraying parts arranged at the bottom end of the top cover, and a water conveying device connected with the water spraying parts, a protective cover with an opening in the top is detachably arranged outside each group of water spraying parts, and the top end of the protective cover is detachably connected with the top cover; by arranging a protective cover with an opening in the top outside each group of water spraying parts and detachably arranging the top cover at the top end of the reaction kettle body, the protective covers can be covered outside the two water spraying parts in advance in the reaction process of chemical products so as to protect the water spraying parts, so that the phenomenon that the water spraying parts are damaged in the production process of the chemical products is avoided. The generated corrosive acid mist enters the water spraying part to corrode the water spraying part, so that the service life of the sprayed water is influenced, and corrosion substances generated by the water spraying part can be prevented from directly falling into materials in the reaction kettle to pollute the materials.

The invention relates to a process for co-producing a seedling culture substrate and corrosive acid by using waste fish or / and shrimp composite cotton straw through hydrothermal carbonization and the seedling culture substrate. The method comprises the following steps: removing fish or / and shrimp waste grease, and stirring to obtain fish or / and shrimp waste slurry; performing wet grinding on the cotton straws to obtain fiber slurry; obtaining the mass ratio of the fish or / and shrimp waste slurry to the fiber slurry and the hydrothermal reaction constant temperature time according to the hull content, the crude protein content and the cotton straw cellulose content; the method comprises the following steps: mixing fish or / and shrimp waste slurry and fiber slurry according to a mass ratio of 100: (20-40), carrying out a hydrothermal reaction, cooling to 60 DEG C, separating a solid phase from a liquid phase, dehydrating the solid phase, drying to obtain a hydrothermal carbonized product, condensing and recovering the liquid phase, carrying out crystal multi-stage membrane separation, and concentrating to obtain humic acid, wherein the mass ratio of the fish or / and shrimp waste slurry to the fiber slurry is 100: (20-40); and mixing the hydrothermal carbonization product, an acidity regulator and a structure modifier, adding a nitrification inhibitor and a slow release agent, and grinding to obtain the seedling culture substrate.

The invention relates to magnesium formate and a preparation method thereof, and the preparation method of the magnesium formate comprises the following steps: by taking bischofite and ammonium formate as raw materials, carrying out liquid phase reaction in a water phase medium to generate a mixture containing the magnesium formate and ammonium chloride; and solid magnesium formate is separated from the mixture. According to the invention, bischofite (MgCl2. 6H2O) is innovatively selected as a magnesium source, and the substance is a cheap by-product in industrial processes of extracting lithium from a salt lake, preparing salt from seawater and the like and is wide in source, so that the cost of raw materials is greatly reduced. Meanwhile, ammonium formate (NH4HCOO) is adopted to replace traditional formic acid or organic amine and is stable in property, safe and easy to decompose, use of strong corrosive acid or toxic solvent is avoided from the source, and the development trend of green chemistry is met.

The utility model is suitable for the technical field of acid and alkali waste liquid treatment, and provides a corrosion-resistant waste liquid collecting device which comprises a collecting box used for collecting corrosive acid and alkali waste liquid. The discharging pipe is fixedly mounted at the bottom of the collecting box and is used for discharging corrosive waste liquid after neutralization reaction; the filter box is fixedly mounted at the bottom of the collecting box, and a filter plate for filtering residues generated after a corrosive waste liquid neutralization reaction is arranged in the filter box; the discharging mechanism is assembled on the filtering box and the filtering plate; the discharging mechanism is used for discharging residues filtered on the filtering plate; and the flow slowing mechanism is assembled on the collecting box. The corrosion-resistant waste liquid collecting device provided by the scheme can be used for collecting corrosive acid-base waste liquid, residues generated in the waste liquid treatment reaction process can be conveniently filtered, and the complexity of overall treatment of the waste liquid is reduced.

The invention discloses a method for regenerating a waste lithium iron phosphate positive electrode material by using a catechol aqueous solution. According to the method, a lithium iron phosphate material without lithium is dispersed in an aqueous solution containing catechol, the catechol can be subjected to oxidative conversion under the condition of the aqueous solution and can generate coordination or complexation with iron active sites on the surface of the material, electron transfer reaction on the surface of the material is facilitated, and the embedding process of lithium ions on a solid-liquid interface is promoted. In the reaction system, catechol and an oxidation product thereof participate in an electron supply process, and the valence state of a FePO4 phase in the material is converted, so that the conversion from Fe < 3 + > to Fe < 2 + > is realized, and lithium ions are supplemented and embedded into a crystal structure along with the conversion from Fe < 3 + > to Fe < 2 + >. Under a preferable condition, the method disclosed by the invention can realize lithium supplementation of the waste lithium iron phosphate in a relatively short time. The method is mild in process and low in energy consumption, does not need an organic solvent and strong corrosive acid-base, can improve the lithium content of the lithium-lost material and improve the electrochemical performance of the lithium-lost material, and is suitable for green regeneration treatment of the lithium iron phosphate positive electrode material of the retired power battery.

The application belongs to the technical field of surface treatment of magnetic materials, and particularly relates to a nitric acid-free pickling solution for neodymium iron boron materials and a preparation method and application thereof, which comprises square acid, pararosolic acid, ethylenediaminetetraacetic acid, sodium polyoxyethylene lauryl ether sulfate, decyl polyoxyethylene lauryl ammonium bromide and water. The nitric acid-free pickling solution for neodymium iron boron materials provided by the application does not contain strong-smoke acid and phosphorus components, is friendly to the environment, will not produce corrosive acid mist in production and use, and is safe to operate under mild conditions. The operation process is simple, has no obvious corrosion or discoloration on the metal substrate, can effectively remove oxides, grease and impurities on the surface of the neodymium iron boron material, and maintains the quality and performance of the material.

The invention provides a preparation method of a 9-fluorinated steroid compound, which comprises the following steps: a compound I reacts with a fluorination reagent to obtain a 9-fluorinated steroid compound II, the reaction formula is as follows: in the formula I and the formula II, R1 and R2 are respectively and independently selected from hydrogen, hydroxyl or hydroxyl with a protecting group, and the 16-position carbon is R configuration or S configuration and represents a single bond or a double bond; the fluorination reagent is selected from Selectfluor or Selectfluor II, and the fluorination reagent is selected from Selectfluor I and Selectfluor II. According to the preparation method of the 9-fluorinated steroid compound II, the 9-fluorinated steroid compound II is prepared by taking a steroid compound as a raw material through a one-step reaction, after the reaction is completed, a fluorination reagent in a reaction solution is quenched, water is added into the reaction solution, and a solid is separated out by cooling and stirring, so that a target product can be obtained. The preparation method provided by the invention has few steps, does not need to use strong corrosive acid, is simple to operate and is suitable for industrial large-scale production.

The invention discloses a low-corrosivity acidic silicone sealant and a preparation method thereof, and belongs to the technical field of silicone sealants. The low-corrosivity acidic silicone sealant is prepared from the following raw materials in parts by weight: 200 to 230 parts of 107 glue, 60 to 200 parts of a plasticizer, 20 to 40 parts of fumed silica, 1 to 3 parts of an acid-binding agent, 0.2 to 0.5 part of a synergistic acid-binding agent, 2 to 5 parts of a composite pH regulator, 15 to 30 parts of a silane cross-linking agent and 0.01 to 0.2 part of a catalyst. The preparation method comprises the following steps: adding the 107 glue, the plasticizer and the silane cross-linking agent, vacuumizing, and uniformly stirring; adding fumed silica and an acid-binding agent, stirring at normal pressure for 5 minutes, scraping, continuously vacuumizing, and uniformly stirring; and finally, adding a catalyst, continuously stirring and vacuumizing, and uniformly mixing to prepare the acidic silicone sealant. The preparation method of the low-corrosivity acidic silicone sealant provided by the invention is simple, and the prepared acidic silicone sealant is high in curing speed, good in cohesiveness, high in strength and low in corrosivity, and can be applied to the field of metal bonding and sealing.

This invention discloses a crushing device for scrapped lead-acid batteries of electric vehicles, belonging to the technical field of crushing devices for scrapped lead-acid batteries of electric vehicles. The invention includes a base, with a frame fixedly connected to the top of the base. A crushing chamber is fixedly fitted onto the top of the frame. By incorporating a purification component, when crushing lead-acid batteries, sodium hydroxide solution is injected into the purification chamber and an air pump is activated. The air pump extracts air from the purification chamber through an air extraction pipe, creating negative pressure inside the chamber. This allows the air extraction pipe to absorb sulfuric acid mist drifting from the feed hopper and evenly discharge it into the purification chamber through a bubble plate. This ensures the sulfuric acid mist fully reacts with the sodium hydroxide solution, achieving the collection and storage effect of dilute sulfuric acid mist. This avoids the problem of large amounts of highly corrosive acid mist polluting the air environment during lead-acid battery crushing, thus improving the cleanliness of the crushing process.

This invention discloses a method for preparing benzyl 3-methyl-5-oxopiperidin-1-carboxylic acid ester and its intermediates. The method uses ethyl acetoacetate as a starting material, proceeding through trifluoromethanesulfonation to generate an enol trifluoromethanesulfonate intermediate, palladium-catalyzed cyanation, catalytic hydrogenation, reduction-cyclization transformation under a borohydride / transition metal salt system, nitrogen carbonyl protection, and sulfonium ylide-mediated transformation to obtain the intermediate. The intermediate is further rearranged / cyclized to obtain the target compound. Compared with existing routes, this invention avoids the use of malodorous / high-risk thiol reagents and highly corrosive acids, thus enabling the preparation of the target compound.

The invention provides a room-temperature hydrogen-sensitive material based on transition metal doping and a preparation method of the room-temperature hydrogen-sensitive material, and belongs to the technical field of semiconductor gas sensor materials. Aiming at the problems that an existing hydrogen sensor needs to work at a high temperature, the response speed is low, the preparation process is complex, and pollution is serious, the room-temperature hydrogen-sensitive material based on transition metal doping is prepared by combining hydrothermal synthesis with a hydrobromic acid-assisted ion exchange process. The response value of the material to 5000ppm hydrogen at room temperature reaches 65.4%, the response / recovery time is only 6 seconds / 36 seconds, meanwhile, an environment-friendly process is adopted to replace strongly corrosive acid, the cost is reduced by 80%, and the material is suitable for high-sensitivity and rapid leakage monitoring of hydrogen energy storage and transportation facilities.

The present invention discloses a deionized cleaning agent and its application in removing pollutants in the field of electronic circuit products, relating to the field of chemical antifouling. The cleaning agent includes the following components by mass fraction: organic base: 1wt%-10wt%; penetrant: 1wt%-5wt%; additive: 1wt%-8wt%; water: balance; the additive is at least one of 3-methylbutyric acid, dipropylene glycol methyl ether acetate, and ethylene glycol ethyl ether acetate. The water-based cleaning agent of the present application adopts an organic base with a penetrant having strong wettability and permeability, which can effectively remove the corrosive "acidic ions" remaining in the PCB manufacturing process during the cleaning process. At the same time, it has a strong penetration ability and can penetrate into the micropore area as fine as 3mil for thorough cleaning, effectively removing pollutants such as fingerprints, grease, and ions, and meeting the cleaning requirements of high-quality products.

The present application belongs to the technical field of lithium ion battery recycling, and particularly relates to a method for efficiently recycling positive electrode materials of waste ternary lithium ion batteries by using green solvents made of pome fruit. The method uses apples as raw materials to prepare green solvents, which are used to replace corrosive acids in the recycling process, and are used to dissolve and recycle metal ions of nickel, cobalt, manganese and lithium in the positive electrode material of waste ternary lithium ion batteries, namely nickel-cobalt-manganese lithium acid, thereby improving the recovery rate of high-value metals such as nickel, cobalt and manganese. The lithium ion battery recycled from the recycled metals has good electrochemical performance and can meet the demand of practical application. The method is green, simple, efficient, low-cost and easy to operate, and conforms to the concept of sustainable development in China at present, and has very high application value.

The invention discloses a convenient automatic acid feeder for a laboratory, and relates to the technical field of laboratory instruments. The main control module is arranged in the corrosion-resistant shell; the high-precision conveying module is arranged in the corrosion-resistant shell and connected to the corrosion-resistant liquid storage system through a corrosion-resistant fluid pipeline, and the high-precision conveying module comprises a driving part and a peristaltic pump driven by the driving part; the corrosion-resistant liquid storage system is provided with a connector which is directly matched with and hermetically connected with a reagent bottle; the man-machine interaction module is arranged on the surface of the corrosion-resistant shell; the safety protection unit is arranged on the corrosion-resistant shell; through modular design and programmed control, accurate, safe and automatic addition of the strongly corrosive acid reagent is realized, and the problems of dangerous operation, poor precision, low efficiency, environmental pollution and the like in a traditional acid adding mode are effectively solved.

The application provides a transition metal doped room temperature hydrogen sensitive material and a preparation method thereof, and belongs to the technical field of semiconductor gas sensor materials. In view of the problems of high-temperature work, slow response speed, complex preparation process and serious pollution of the existing hydrogen sensor, the transition metal doped room temperature hydrogen sensitive material is prepared through a hydrothermal synthesis combined with a hydrobromic acid assisted ion exchange process. The response value of the material to 5000 ppm hydrogen gas reaches 65.4% at room temperature, and the response / recovery time is only 6 seconds / 36 seconds. Meanwhile, the environmentally friendly process is used to replace the strong corrosive acid, and the cost is reduced by 80%, so that the material is suitable for high-sensitivity and rapid leakage monitoring of hydrogen energy storage and transportation facilities.

The invention discloses a preparation method of a 2, 2, 4-trimethyl-1, 2-dihydroquinoline monomer, which comprises the following steps: dropwise adding acetone into a solution containing aniline, an acid catalyst and a polymerization inhibitor at a condensation reaction temperature, and distilling after dropwise adding to obtain the 2, 2, 4-trimethyl-1, 2-dihydroquinoline monomer; the condensation reaction temperature is 100-160 DEG C; and the distillation comprises the following steps: firstly distilling out low-boiling-point substances, then heating to 160-200 DEG C under a 1mm mercury column, and distilling out the 2, 2, 4-trimethyl-1, 2-dihydroquinoline monomer. According to the method, the polymerization inhibitor is added in the reaction process, so that the polymerization reaction of the 2, 2, 4-trimethyl-1, 2-dihydroquinoline monomer is effectively avoided, the generation of dimer, trimer and tetramer is reduced, and meanwhile, the yield of more than 80% and the purity of more than 95% can be obtained by optimizing the reaction conditions. The method does not need to use a strong corrosive acid catalyst, is simple in purification operation, and is suitable for industrial production.

The invention discloses a method for preparing high-performance natural rubber by adopting a traditional full-latex process, and relates to the technical field of rubber preparation, the method for preparing the high-performance natural rubber by adopting the traditional full-latex process adopts a traditional full-latex production line, and the production line sequentially comprises the procedures of solidification, tabletting, granulation, drying and packaging. In the solidification process, a composite coagulator system is used for replacing a traditional acid coagulator, the composite coagulator system is composed of a biological coagulator and an auxiliary coagulator, corrosive acid chemical coagulators such as acetic acid and formic acid are abandoned, the problems of acid wastewater discharge and workshop corrosive gas are avoided, the working environment is improved, and meanwhile, the production cost is reduced. Compared with a smoked sheet rubber process needing wood combustion, the method does not need smoking, emission of atmospheric pollutants is avoided, the requirements of green manufacturing and the national low-carbon strategy are completely met, meanwhile, an existing production process is slightly changed, and the threshold and risk of technology upgrading are greatly reduced.

The invention relates to the technical field of electrochemical energy storage, in particular to an electrolyte with an acidic substance inhibition function and application thereof, and aims to solve the problems that an existing electrolyte can generate corrosive acidic products, dissolution and structural damage of an electrode material are aggravated, the integrity of an SEI (solid electrolyte interface) film is damaged, and the service life of the SEI film is prolonged. The problem that the cycling stability of the electrochemical energy storage device is poor is solved. According to the electrolyte, the acidic substance inhibition function additive is added as an acidic substance inhibition component, so that the acidic substance inhibition function additive can be subjected to neutralization reaction with acidic substances (such as HF) in the electrolyte, and meanwhile, a protective interfacial film is formed on the surface of an electrode, so that the acidic substances are prevented from corroding an electrode material; the electrolyte chemical stability of the electrochemical energy storage device in the charge-discharge cycle process can be effectively maintained, and an important material basis is provided for development of the high-performance and long-life electrochemical energy storage device.