245 results about "Hydrogen Sulfate" patented technology

The invention discloses a preparation method and application of active cationic chitosan nanoparticles, which comprises the following steps: reacting a low-molecular chitosan triethylamine hydrogen sulfate ionic liquid ([(C2H5) 3NH] HSO4) solution with an aldehyde compound ethanol solution to form Schiff base protection on chitosan C2-site amino, and then reacting with 2, 3, 5, 6-tetramethyl-4-piperidine-2-one to obtain the active cationic chitosan nanoparticles. The preparation method comprises the following steps: carrying out nucleophilic substitution reaction on chitosan C6 in the presence of a basic catalyst by using 2, 3-epoxypropyl trimethyl ammonium chloride, then adding a chemical initiator, carrying out grafting reaction on chitosan C3 and acrylic acid, and then removing Schiff base protection on chitosan C2. Carboxylate anions of acrylic acid and cations of chitosan are subjected to cross-linking self-assembly through a hydrothermal reaction, and the chitosan nanoparticles which are high in stability, small in particle size, uniform in distribution and efficient and lasting in function are obtained. The prepared nanoparticles are high in reaction activity, contain a large amount of quaternary ammonium salt, amino dication groups and carboxyl groups, and have wide application prospects in the fields of dye adsorption, heavy metal adsorption, textile function finishing and the like.

The invention discloses a treatment method of oxadiargyl byproduct etherified salt slag and hydrolysis waste sulfuric acid, which comprises the following steps: comprehensively treating the byproduct etherified salt slag and hydrolysis waste sulfuric acid generated in the production process of oxadiargyl; the method comprises the following steps: converting etherified salt slag and potassium hydrogen sulfate into an isopropyl bromide product capable of being used for producing oxadiargyl and a potassium hydrogen sulfate product capable of being directly sold, dropwise adding hydrolyzed waste sulfuric acid into a mixed solution of etherified salt slag, water and isopropanol, carrying out a reflux reaction, carrying out atmospheric distillation, cooling and filtering to obtain an isopropyl bromide crude product and a potassium hydrogen sulfate crude product; the treatment method is simple and convenient to operate, the treatment difficulty of the etherified salt slag and the hydrolysis waste sulfuric acid can be solved at the same time, the treatment cost is reduced, effective recovery of the etherified salt slag and the hydrolysis waste sulfuric acid is realized, effective components in the two wastes are fully utilized, and the method is suitable for industrial production. The treatment process basically has no secondary pollution, has no special requirements on production equipment, and can be suitable for industrial production.

The invention provides a method for preparing high-purity acrylate by removing trace impurity aldehyde, which comprises the following steps: mixing crude acrylate with a polymerization inhibitor to form an organic phase; adding an aqueous solution of a dealdehyding agent into the organic phase to form an oil-water two-phase system; the oil-water two-phase system is forcibly stirred for 0.1-2.0 hours at the temperature of 20-40 DEG C, so that the impurity aldehyde and the dealdehyding agent are subjected to nucleophilic addition reaction, and a generated aldehyde-dealdehyding agent addition product is dissolved in a water phase; standing and layering the reacted material, separating and removing a water phase to obtain an organic phase without impurities; carrying out reduced pressure rectification on the organic phase after impurity removal to obtain a high-purity acrylate product with the total aldehyde content lower than 50ppm; wherein the aldehyde removing agent is sodium hydrogen sulfite, potassium hydrogen sulfite, calcium hydrogen sulfite, ammonium hydrogen sulfite or a mixture of any two or more of the sodium hydrogen sulfite, the potassium hydrogen sulfite, the calcium hydrogen sulfite and the ammonium hydrogen sulfite. The method is efficient, economical, free of solid deposition and easy for industrial continuous operation.

The invention provides a viloxazine hydrochloride product impurity as well as a synthesis method and application thereof, and belongs to the technical field of medicine synthesis. The viloxazine hydrochloride product impurity is shown as a formula (I), the synthesis method comprises the following steps: adding epichlorohydrin and organic alkali into 2-ethoxyphenol for preliminary reaction, adding an alkaline solution for further reaction, and purifying to obtain a compound 1; 2-aminoethyl hydrogen sulfate and tetrabutylammonium bromide are added and heated, an alkali solution is dropwise added for a reaction, and a reaction mixture is obtained; filtering to obtain filtrate; concentrating to remove alcohol, adding ethyl acetate, standing, and separating to obtain an organic phase; adding acid, and filtering to obtain secondary filtrate; and purifying to obtain the viloxazine hydrochloride product impurity. The invention also provides an application of the viloxazine hydrochloride product impurity in product quality control. Compared with the prior art, the synthesis method provided by the invention is simple and feasible, raw materials are easy to obtain, and the operation is convenient. # imgabs0 #

The invention relates to the technical field of niobium-tantalum-iron ore purification, in particular to a method for preparing high-purity tantalum pentoxide and niobium pentoxide from niobium-tantalum-iron ore. The method comprises the following steps: firstly, adding ammonium fluoride and ammonium sulfate to help mineral decomposition and reduce the roasting temperature, then treating the niobium-tantalum iron ore by using a sulfuric acid-hydrofluoric acid mixed solution to fully dissolve niobium-tantalum oxides, then extracting and separating niobium and tantalum by using a specific solvent system, and finally adding ammonia water to precipitate and calcine to obtain the niobium-tantalum iron ore. The high-purity niobium pentoxide and tantalum pentoxide are prepared, the product yield is high, the impurity content is low, and the niobium pentoxide and tantalum pentoxide are suitable for being used as raw materials of capacitor-grade tantalum powder and niobium powder.

The invention discloses a composite browning liquid for a printed circuit board and a preparation method of the composite browning liquid. The composite browning liquid comprises the following components: 60-85 g / L of 98 wt% concentrated sulfuric acid, 12-20 g / L of 30 wt% hydrogen peroxide, 1-2 g / L of a modified corrosion inhibitor, 8-14 g / L of a silane coupling agent, 1.5-3 g / L of 1-butyl-3-methylimidazolium hydrogen sulfate, 4-8 g / L of an impregnating compound, 5-8 g / L of a dispersing agent and the balance of deionized water. The modified corrosion inhibitor prepared by a specific method, the silane coupling agent, the ionic liquid and the compound surfactant are scientifically compounded, so that the copper surface treatment effect is remarkably improved, and the inherent contradiction between binding force improvement and over-etching prevention of a traditional browning liquid is solved; the browning liquid has the advantages of stable treatment effect, long service life, reduction of waste liquid output and the like, and is suitable for industrial production requirements of high-density printed circuit boards.

The invention relates to the field of preparation of guanidine or derivatives thereof, and particularly discloses high-purity creatine monohydrate and a preparation method thereof. The preparation method comprises the following steps: sequentially carrying out condensation reaction, acidolysis reaction and hydrolysis reaction on dimethyl sulfate and urea, cooling, crystallizing and filtering to obtain O-methylisourea hydrogen sulfate, and then reacting a sarcosine salt aqueous solution with the O-methylisourea hydrogen sulfate under the conditions that the temperature is 45-65 DEG C and the pH value is 10-12 to obtain the sarcosine salt. And performing post-treatment to obtain the high-purity creatine monohydrate. The preparation method has the advantages of being low in raw material cost, easy to transport and store and rich in source, byproducts in the reaction process are few, danger is low, the yield and purity are high, the industrial requirement is met, and the preparation method is suitable for large-scale industrial production.

To provide a novel salt of a compound that is a Bcl-2 inhibitor.SOLUTION: The present invention provides a novel salt, which is a hydrogen sulfate salt, represented by the following structural formula; related crystalline forms, characterized by X-ray powder diffraction patterns; a method for preparing the same; and pharmaceutical compositions containing the same.SELECTED DRAWING: None

The invention discloses a method for synthesizing 3-(2-hydroperoxy-2-propyl) phenol and a preparation method of the 3-(2-hydroperoxy-2-propyl) phenol. The method comprises the following steps: in the presence of a solvent, 1, 3-bis (2-hydroperoxy-2-propyl) benzene is in contact with a potassium hydrogen sulfate catalyst for an acidolysis reaction, 3-(2-hydroperoxy-2-propyl) phenol is obtained, and the weight ratio of the 1, 3-bis (2-hydroperoxy-2-propyl) benzene to the catalyst is (15-48): 1. According to the method provided by the invention, 1, 3-bis (2-hydroperoxy-2-propyl) benzene (m-DHP) is used as a raw material, and a selective acidolysis reaction is carried out in the presence of a solid potassium hydrogen sulfate catalyst to obtain 3-(2-hydroperoxy-2-propyl) phenol m-HPP. The method has the characteristics of high yield, cleanness, environment friendliness, mild reaction conditions and easiness in industrialization.

The invention provides a preparation method and device of prothioconazole. The preparation method comprises the following steps: carrying out Grignard reaction on o-chlorobenzyl chloride and magnesium powder in a mixed solvent of toluene and 2-methyltetrahydrofuran; the method comprises the following steps: carrying out Grignard addition reaction on a Grignard reagent and 2-chloro-1-(1-chlorocyclopropyl) ethanone; the preparation method comprises the following steps: carrying out substitution reaction on 1-chloro-2-(1-chlorocyclopropyl)-3-(2-chlorphenyl) propanol and hydrazine hydrate in an alcohol solvent; the preparation method comprises the following steps: carrying out ring closing reaction on 2-(1-chlorocyclopropyl)-1-(2-chlorphenyl)-3-hydrazino-2-alcohol, a formaldehyde solution, a sodium thiocyanate solution and a sodium hydrogen sulfate solution; the preparation method comprises the following steps: carrying out oxidation reaction on 2-(2-chlorocyclopropyl)-3-(2-chlorphenyl)-2-hydroxypropyl)-1, 2, 4-triazolidine-3-thioketone, air and inorganic alkali, so as to obtain prothioconazole. The method can improve the efficiency of the oxidation reaction and the yield and purity of prothioconazole, and is more suitable for industrial production of prothioconazole.

The invention discloses a method for separating zirconium and hafnium in a solution, and relates to the field of metal adsorption, separation and purification. According to the method for separating zirconium and hafnium in the solution, firstly, specific ligands such as persulfate and hydrogen persulfate are selected, zirconium and hafnium form a zirconium complex and a hafnium complex with larger size difference in a complexing mode, then under the acidic condition that the pH is smaller than or equal to 4.0, a specific porous material with the aperture being 1-50 nm is selected, and the zirconium and hafnium in the solution are separated. According to the method, a mixture of zirconium and hafnium complexes is adsorbed, separation of zirconium and hafnium in the zirconium and hafnium ion coexisting solution is achieved, the separation coefficient beta Hf / Zr can reach 0.84 or below or 1.49 or above, and the method is environmentally friendly, simple and convenient.

The invention relates to a method for comprehensively recycling a positive electrode material of a waste lithium iron phosphate battery, which comprises the following steps of: (1) discharging the waste lithium iron phosphate battery: providing a power supply by the waste lithium iron phosphate battery, and electrolyzing a lithium precipitation mother solution by using a three-chamber diaphragm electrolytic bath; (2) crushing and sorting; (3) two-stage leaching: leaching the lithium iron phosphate positive electrode powder with a sulfuric acid solution generated by electrolysis of a lithium precipitation mother solution, and adding an aeration disc at the bottom of a reaction kettle for aeration; adding a dilute sulfuric acid solution generated by electrolysis of lithium precipitation mother liquor into first-section leaching residues for leaching; (4) two-stage impurity removal; and (5) preparing lithium carbonate. According to the method, the lithium precipitation mother liquor for the waste lithium iron phosphate battery is discharged to prepare the sulfuric acid and sodium hydroxide-lithium hydroxide mixed solution for production, so that residual electricity is utilized, a production reagent is saved, and the problems of high energy consumption, large lithium loss and poor sale of a byproduct sodium sulfate in evaporative crystallization of sodium sulfate are solved; and the aim of circularly and comprehensively utilizing the waste lithium iron phosphate battery is fulfilled.

The invention discloses a phase change microcapsule antibacterial material based on an alkylated chitosan-polystyrene copolymer and a preparation method thereof.The material is composed of a core material and a wall material, the core material is an aliphatic hydrocarbon phase change material, the wall material is the alkylated chitosan-polystyrene copolymer, and the alkylated chitosan-polystyrene copolymer is a mixture of the alkylated chitosan-polystyrene copolymer and the alkylated chitosan-polystyrene copolymer. The outer layer of the wall material is an alkylated chitosan-styrene grafted section, and the inner layer of the wall material is a polystyrene cross-linked section; according to the invention, tert-butyl hydrogen sulfate is designed as an amino protective agent for the first time, and amino protective grafting is carried out on chitosan through a path of'protection-grafting-deprotection 'to synthesize alkylated chitosan (ACS); and preparing the phase-change microcapsule antibacterial material with the ACS-g-PSt material as the wall material by using ACS as an emulsifier and a wall material component at the same time through a microemulsion interfacial polymerization method, so that the application research blank of the chitosan grafting material in the field of phase-change microcapsules is filled; and a new technology and direction are provided for industrial application of the phase change microcapsules in the fields of medical treatment and public health and the like.

The invention discloses a method for treating lithium-containing wastewater generated in an acid leaching carbonization lithium precipitation process, which comprises the following steps of: mixing a carbonization lithium precipitation mother solution generated in a carbonization lithium precipitation section with carbonization lithium precipitation washing water, preheating, evaporating until lithium carbonate is separated out, dehydrating the material to obtain solid lithium carbonate and a secondary lithium mother solution, adding concentrated sulfuric acid into the secondary lithium mother solution, and then adding the concentrated sulfuric acid into the secondary lithium mother solution; then adding sodium hydroxide to alkalescence to obtain sodium-separated raw water, evaporating the sodium-separated raw water until sodium sulfate is separated out, performing solid-liquid separation to obtain solid sodium sulfate and sodium-separated mother liquor, freezing and crystallizing the sodium-separated mother liquor until sodium sulfate crystals are separated out, and separating to obtain sodium sulfate crystals and frozen centrifugal mother liquor. According to the treatment method, secondary output of lithium carbonate in industrial grade and even battery grade product forms can be achieved, sodium sulfate is output in a larger proportion in an anhydrous sodium sulphate product form, and meanwhile consumption of sulfuric acid and sodium hydroxide is reduced.

The invention provides a novel technology for concentrating dried waste sulfuric acid of a chloromethane synthesis device. According to a traditional sulfuric acid recovery process, waste sulfuric acid and water are mixed and hydrolyzed, then rectification and concentration are carried out, during hydrolysis, the waste sulfuric acid usually needs to be diluted to the concentration of about 50%, a large amount of introduced water needs to be removed during rectification and concentration, and steam consumption is huge. The process provided by the invention is as follows: waste sulfuric acid after drying and impurity removal in chloromethane synthesis firstly exchanges heat with concentrated high-temperature concentrated sulfuric acid and then enters a rectifying tower 1, 96% concentrated sulfuric acid is extracted from the tower bottom, most sulfuric acid in the waste sulfuric acid is recovered, and a gas phase at the tower top contains moisture, a small amount of sulfuric acid and organic matters (dimethyl sulfate and the like) and the like. The method comprises the following steps: condensing a gas phase at the top of a rectifying tower 1, mixing with a certain proportion of water, feeding into an upper tower 2 of a hydrolysis tower, hydrolyzing dimethyl sulfate and methyl hydrogen sulfate into sulfuric acid and methanol, removing part of organic matters and water through an upper tower heater, feeding the sulfuric acid in a tower kettle into a lower tower 3 of the hydrolysis tower, and concentrating to 96% through vacuum rectification.

The present application belongs to the technical field of flue gas purification, and discloses a kind of automatic adjusting device of denitration ammonia injection gate, including wind pressure sensing element, pressure regulating opening device, temperature feedforward regulating device on ammonia injection head, according to mechanical mode automatic adjusting ammonia injection gate opening, realize according to flue gas volume automatic adjusting the ammonia injection amount of each ammonia injection gate;Device realizes the automatic control and adjustment of on-site equipment, both meets the national environmental protection to thermal power plant NO x The emission requirement, also reduces the consumption of ammonia injection of power plant, for sulfur-containing coal, reduces the generation of sulfuric acid hydrogen ammonium, avoids the plugging and hardening problem of air preheater, dust collector and tail flue, does not increase flue resistance, does not increase the specific consumption of induced draft fan, and does not cause the problem of unit load limitation.

The invention relates to an alloy material suitable for blow molding. Comprising the following components: PC resin, PET resin, POK resin and a compatilizer, the difference value between the melt index of the PC resin at 300 DEG C / 1.2 kg and the melt index of the POK resin at 240 DEG C / 1.2 kg is 0.5 g / 10min to 5g / 10min; the preparation method of the compatilizer comprises the following steps: carrying out melt extrusion granulation on 90-98 parts by mass of POK resin, 2-8 parts by mass of glycidyl methacrylate GMA, 0.1-0.5 part by mass of peroxide initiator and 5-7 parts by mass of ionic liquid to obtain the compatilizer; the ionic liquid is selected from at least one of 1-hexyl-3-methylimidazole hydrogen sulfate, 1-butyl-3-methylimidazole hydrogen sulfate, 1-methylimidazole hydrogen sulfate and 1-hexyl-2, 3, 5-trimethyl pyrazole hydrogen sulfate, and the ionic liquid is selected from at least one of 1-hexyl-3-methylimidazole hydrogen sulfate, 1-butyl-3-methylimidazole hydrogen sulfate, 1-methylimidazole hydrogen sulfate and 1-hexyl-2, 3, 5-trimethyl pyrazole hydrogen sulfate. The material has the advantages of high strength, high impact, excellent weather resistance, heat resistance, chemical resistance and heat release, and is especially suitable for manufacturing and production of blow molding products.

The application discloses a preparation and by-product recycling process of acesulfame potassium, and belongs to the technical field of food additive production and processing. Amino sulfonic acid is added into N-butyl pyridine hydrogen sulfate ionic liquid and triethylamine in batches to obtain a homogeneous mixed solution; secondly, the mixed solution and diketene are introduced into a micro-channel reactor to perform a condensation reaction; and the discharge liquid is introduced into a polystyrene sulfonic acid resin loaded SO3 fixed bed reactor to perform a cyclization reaction; subsequently, the cyclization product is subjected to hydrolysis, decolorization, potassium salt crystallization and drying to obtain the acesulfame potassium product; and the crystallization mother liquor is separated through a nanofiltration membrane, and the intercepted liquid is an ionic liquid and triethylamine mixture, which is directly reused. The application inhibits the self-polymerization of diketene through the micro-channel reactor, replaces concentrated sulfuric acid with solid acid to avoid waste acid pollution, and realizes efficient recycling of by-products by combining nanofiltration membrane separation and catalytic depolymerization technology, and has the characteristics of green environmental protection and economic efficiency.

The invention discloses a compound fertilizer for Cinnamomum longepaniculatum planting and a preparation method thereof, and belongs to the technical field of fertilizers. According to the preparation method disclosed by the invention, the cinnamomum longepaniculatum leaf residues, the crop straws, the bean dregs and the bone meal are used as raw materials, manganese ions and zinc ions are used as auxiliary materials, and the surfaces of final fertilizer particles are coated with potassium hydrogen acid, so that the finally obtained compound fertilizer can contain a large amount of nutrient substances which can be effectively absorbed by root systems of cinnamomum longepaniculatum, and the effect of improving the yield is achieved. Therefore, the activity of a key enzyme for synthesizing the cinnamomum longepaniculatum oil in the cinnamomum longepaniculatum is activated, the accumulation of the cinnamomum longepaniculatum oil in the leaves is promoted, and the cinnamomum longepaniculatum oil content in the cinnamomum longepaniculatum leaves The coated potassium hydrogen sulfate can release potassium ions and hydrogen sulfate ions, so that the content of potassium in the fertilizer is increased, most importantly, the soil acidity and alkalinity can be adjusted, and a fertilization area is weakly acidic, so that the absorption of the root system of the cinnamomum longepaniculatum on effective substances can be promoted, and the yield of the cinnamomum longepaniculatum is increased. The utilization rate of the fertilizer is increased; meanwhile, the content of the cinnamomum longepaniculatum oil in the cinnamomum longepaniculatum leaves can be

The present application relates to the technical field of catalyst regeneration, and discloses a regeneration method of deactivated denitration catalysts. The regeneration method comprises the following steps: (1) performing at least one heat treatment on the deactivated denitration catalyst monomer; (2) placing the deactivated denitration catalyst monomer after heat treatment in an electrolyte solution for electrochemical treatment, and then performing rinsing; (3) placing the deactivated denitration catalyst monomer after rinsing in a mechanical reinforcement solution and an active component supplement solution in sequence for impregnation; and (4) performing oxidation calcination on the deactivated denitration catalyst monomer after impregnation, and then performing reduction. The method can perform overall regeneration on the deactivated denitration catalysts caused by metal elements such as Fe, Pb, Cu and As, organic matters such as COD, and hydrogen sulfate ammonium type miscellaneous salts, the regenerated denitration catalyst obtained can maintain the integrity of the structure, has higher mechanical strength and catalytic activity, and can be directly put into use.

The invention discloses an anti-blocking treatment system and method for an air preheater. The anti-blocking treatment system comprises an air taking induced draft fan, a first main flue gas pipeline, a second main flue gas pipeline, a flue gas discharging pipeline, a bypass discharging pipeline, a high-temperature air taking pipeline, a flue gas circulating pipeline, a first cold air adjusting pipeline, a second cold air adjusting pipeline, control valves installed on all the pipelines and the like. The boiler hot secondary air recirculation, the flue gas bypass and the induced draft fan are cooperatively adjusted, switching operation of the air preheater between a normal operation state and an off-line cleaning state is rapidly achieved by adjusting and controlling the opening and closing conditions of all valves according to the pressure difference of an inlet and an outlet of the air preheater, and normal operation of the system is not affected; in the off-line cleaning state, the operating temperature of the whole air preheater is increased, ammonium bisulfate attached to the surface of the air preheater is subjected to high-temperature decomposition, the development trend of ammonium bisulfate blockage can be effectively restrained and controlled, and therefore it is guaranteed that unit equipment stably operates for a long time.

The invention discloses a preparation method of a copper foil brightener additive, and belongs to the technical field of synthesis of sulfur-containing organic matters. The preparation method mainly comprises the following steps: by taking ethanolamine hydrochloride as a starting raw material, firstly generating sulfate amino alcohol hydrosalt, then synthesizing and generating an intermediate product by taking carbon disulfide as a sulfur source, carrying out simple spin-drying treatment on the intermediate product, and directly reacting with 1, 2, 3-trimethyl-1, 3-pentanedione to obtain the 1, 2, 3-pentanedione. The target product 3-(thiazoline-2-sulfydryl) sodium propanesulfonate can be obtained by reacting 1, 3-propane sultone at normal temperature for 4 hours. The additive prepared by the method disclosed by the invention has the advantages of cheap and easily available raw materials, mild reaction conditions, high yield and the like.

The invention relates to a pyridinium-based hypochlorite detection probe and a preparation method thereof. The structure of the fluorescent probe is as shown in a formula I. The fluorescent molecular probe is prepared by taking o-alkynyl aldehyde as a raw material and carrying out condensation reaction on the o-alkynyl aldehyde and pyridinium salt. The probe synthesis method is simple, the reaction condition is mild, and the yield of the target compound is high. The fluorescent molecular probe is stable in optical performance, high in hypochlorite detection sensitivity and low in lower detection limit, the detection limit is 0.38 mu M, and the response range is 5-200 mu M. The selectivity is good, and no response is caused to fluorine ions, iodide ions, perchlorate ions, hydrogen sulfate ions, sulfate ions, acetate ions, thiocyanate ions, sulfur ions and the like. The fluorescent molecular probe provided by the invention has practical application value in the fields of biochemistry and environmental chemistry, especially detection of hypochlorite ions in water and the like. # imgabs0 #

The present invention discloses a method for producing super-grade anhydrite by decomposing calcium chloride and producing hydrochloric acid as a byproduct. The method comprises heating a calcium chloride solution to above 102°C, adding concentrated sulfuric acid for stirring reaction, obtaining a reaction solution containing calcium sulfate precipitation and hydrogen chloride gas; the reaction solution containing calcium sulfate precipitation is subjected to solid-liquid separation to obtain an anhydrous calcium sulfate product and a filtrate containing calcium chloride; the hydrogen chloride gas is absorbed by water to obtain hydrochloric acid. The anhydrous calcium sulfate obtained by the method has high grade and good quality, meets the quality standard of super-grade anhydrite specified in GB / T 5483‑2008, and has a complete crystal structure, no cracks, low surface activity, and is suitable for use as a filler in industries such as plastics, rubber, paint, textiles, and papermaking. The method is simple, easy to operate, and has low production cost, and is suitable for large-scale industrial production of super-grade anhydrite.

The present invention provides a porous hard carbon negative electrode material and its preparation method and sodium ion battery, relating to the technical field of sodium ion batteries; the preparation method comprises the following steps: a template, a hard carbon precursor, an activator and 1-ethyl-3-methylimidazole hydrogen sulfate are evenly ground to obtain a mixture; the mixture is heated to 700-900°C in an inert gas atmosphere to obtain a carbonized material; the carbonized material is subjected to secondary pore formation to obtain a porous carbonized material; the porous carbonized material is washed and dried, and then immersed in a polyoxometalate sodium salt solution to obtain a soaked material; the soaked material is washed and dried, and the dried material is heated to 1200-1400°C in an inert gas atmosphere to obtain a porous hard carbon negative electrode material. The present invention introduces active sites into the porous carbon material during the carbonization process, and then introduces polyoxometalate sodium salt on the active sites. The polyoxometalate skeleton in the polyoxometalate sodium salt can allow sodium ions to be transmitted in its micropores, thereby improving the gram capacity and coulombic efficiency of the material.

The present invention provides a method for selectively separating useful elements from anatase, comprising: step S1, anatase is successively mechanically activated and leached under pressure with nitric acid, followed by solid-liquid separation to obtain a scandium-containing aluminum liquid and a first filter material, and the scandium-containing aluminum liquid is neutralized, extracted and stripped to obtain an aluminum liquid and a scandium-rich material; step S2, the first filter material is added with a hydrochloric acid solution to leach iron, and a ferric chloride solution and a second filter material are obtained after solid-liquid separation; the main elements in the second filter material are silicon and titanium; step S3, the second filter material is mixed with potassium hydrogen sulfate for melting roasting-water leaching and then solid-liquid separation is performed to obtain a first filtrate and active silicon powder, and the first filtrate is hydrolyzed at high temperature, and solid-liquid separation is performed to obtain titanium dioxide and a second filtrate; step S4, the second filtrate is mixed with sulfuric acid, evaporated and concentrated, and cooled and crystallized to obtain potassium hydrogen sulfate, and the potassium hydrogen sulfate is returned to step S3. The method of the present invention not only has high comprehensive resource utilization rate and high product purity, but also has the advantages of short process flow and good economic benefits.

The utility model relates to the technical field of powder packaging, in particular to a powder dredging structure of potassium hydrogen persulfate compound powder filling equipment, which comprises filling pipes arranged at the lower ends of filling barrels and supplementing barrels, and the filling pipes are fixedly connected with the respective filling barrels or supplementing barrels through connecting parts; a scraping plate is slidably connected to the inner wall of the filling pipe, the top of the scraping plate is arranged in the connecting part, and a driving mechanism is further arranged in the connecting part and used for driving the scraping plate to rotate along the inner wall of the filling pipe. And a scraping plate is arranged in the filling pipe and is in sliding connection with the inner wall of the filling pipe. After filling is completed every time, the scraping plate rotates by a circle along the inner wall of the filling pipe, so that the potassium hydrogen sulfate compound powder remaining on the inner wall of the filling pipe can be effectively scraped off, and the potassium hydrogen sulfate compound powder falls into a potassium hydrogen sulfate compound powder packaging box. Not only is waste avoided, but also the problem of residual potassium hydrogen sulfate compound powder in the filling pipe is effectively solved, and meanwhile, the residual potassium hydrogen sulfate compound powder is prevented from drifting everywhere.

The utility model relates to the technical field of rotary air pre-heaters, and discloses an anti-blocking system of a rotary air pre-heater, which is characterized in that a circulating air sealing sector plate is additionally arranged at the cold end of the rotary air pre-heater to form a circulating air inlet with an original second sealing sector plate; and part of hot secondary air is led out from the hot secondary air mother pipe through the hot secondary air branch pipeline and conveyed to the circulating air inlet, so that the hot secondary air can be utilized to preheat the cold-end heat storage element which is about to enter the smoke side, on one hand, the surface temperature of the cold-end heat storage element can reach the acid dew point or above, formation of acid mist is reduced, and the energy consumption is reduced. Therefore, the formation of sulfate taking CaSO4 as a main component can be reduced; and on the other hand, the ammonium hydrogen sulfate deposition area is promoted to move downwards, the steam soot blowing effect can be improved, and then the air pre-heater blocking risk can be reduced.

Disclosed is an alkali metal ion conductor which behaves as a liquid at a low temperature. The alkali metal ion conductor of the present disclosure is an alkali metal ion conductor comprising a salt, wherein the salt comprises a first cation, a second cation, and a first anion, the first cation is a tetraalkylammonium ion having an alkyl chain length of 5 or more, the second cation is an alkali metal ion, and the first anion is at least one anion selected from the group consisting of a bromine ion, a chlorine ion, and a hydrogen sulfate ion.

The invention relates to a method for removing a metal layer on the back of a substrate. The method for removing the metal layer on the back face of the substrate comprises the following steps that a base is provided, the base comprises the substrate and the metal layer located on the back face of the substrate, and the metal layer at least comprises a metal titanium layer, a metal nickel layer and a metal silver layer; the metal titanium layer, the metal nickel layer and the metal silver layer in the metal layer are removed at the same time through a wet cleaning process, and corrosive liquid used in the wet cleaning process is a mixed solution containing concentrated sulfuric acid, hydrofluoric acid and concentrated nitric acid. According to the method, the metal titanium layer, the metal nickel layer and the metal silver layer in the metal layer are removed at the same time, multiple times of corrosion operation are not needed, operation is easy, and risks caused by using aqua regia are avoided.