527 results about "Oxalic acid" patented technology

The invention discloses a method for recycling lithium in a lithium battery, and belongs to the field of lithium battery recycling. The method comprises the following steps: decomposing the lithium battery, and performing pyrolysis treatment at 200-500 DEG C to obtain a slag material; the slag charge is placed in a composite leaching agent, the pH is adjusted to 1.5-2.5, lithium in the slag charge is leached out, and a leaching solution is obtained; the composite leaching agent comprises oxalic acid, an amino acid ligand, persulfate and fluorine ions; adjusting the pH value of the leaching solution to 5.5-6.2, adding an extracting agent into the leaching solution, extracting lithium ions in the leaching solution, and separating to obtain a lithium-rich organic phase and lithium-containing waste liquid; the extraction agent comprises crown ether and organophosphate; and the lithium-rich organic phase is subjected to back extraction, so that lithium ions are released from the organic phase, a lithium-rich back extraction solution is obtained, a carbonate solution is added into the lithium-rich back extraction solution, and lithium carbonate precipitates are obtained. According to the method for recycling the lithium in the lithium battery, selective leaching of the lithium can be achieved, and the comprehensive yield of the lithium in the lithium battery is increased.

The invention discloses a device and a method for producing oxamide, and relates to the field of chemical production. The method for producing oxamide specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry obtained after the reaction is finished to obtain solid oxamide, and refining a liquid phase obtained by solid-liquid separation of the first slurry to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. In the oxamide production process, dimethyl oxalate reacts with ammonia gas in mixed gas generated in the reaction process, and the obtained product is continuously subjected to subsequent ammonolysis reaction, so that the utilization rate of reaction materials is increased; meanwhile, a condenser is not used for condensing ammonia gas and methanol and then separating alcohol and ammonia, so that condensing equipment and cooling water are saved, the production cost is reduced, and industrial production is facilitated.

The invention discloses a process and a device for producing oxamide, and relates to the field of chemical production. The invention provides a process for producing oxamide, which specifically comprises the following steps: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate, carrying out ammonolysis reaction, carrying out flash evaporation, filtration and drying on first slurry after the reaction is finished to obtain solid oxamide, and carrying out liquid phase refining to obtain a byproduct methanol, ammonia in the tail gas is washed and absorbed by dimethyl oxalate and then returns to a reaction system. The methanol solution of dimethyl oxalate is used for absorbing excessive ammonia in the reaction process, and the reaction product is continuously used for producing oxamide, so that methanol and ammonia can be thoroughly separated, the conversion rate of ammonia can be greatly improved, and the economical efficiency of the production process is improved; meanwhile, tail gas containing ammonia is not discharged, and the environmental protection property of the production process is improved.

The invention belongs to the technical field of pharmaceutical chemical processes, and particularly relates to a preparation method of a penem antibiotic intermediate 4-BMA, which comprises the following steps: adding Zn powder, chlorosilane, aliphatic tertiary amine, zinc salt and 4-AA in a formula (I) into THF (tetrahydrofuran), uniformly stirring, dropwise adding a THF solution of alpha-haloamide with an induction group in a formula (II) for reaction, filtering the reaction solution, removing the zinc powder, and drying to obtain the penem antibiotic intermediate 4-BMA. Extracting the filtrate to obtain a THF phase, washing with an aqueous solution of potassium oxalate, and recovering THF to obtain a formula (III); and carrying out oxidative hydrolysis, sulfur dioxide quenching, sulfur dioxide acid regulation crystallization and recrystallization on the formula (III) to obtain the intermediate 4-BMA. According to the preparation method disclosed by the invention, a zinc salt is used as a catalyst during preparation of the formula (III), potassium oxalate is used for removing residual Zn (II) in a THF phase, SO2 is used for quenching hydrogen peroxide and acid regulation and crystallization of 4-BMA, the oxygenolysis problem of 4-BMA is solved, and the preparation method has the characteristics of greenness, safety and high efficiency, is strong in product competitive advantage and is suitable for industrial production.

The invention discloses preparation of a high-uniformity cerium oxide abrasive material and application of the high-uniformity cerium oxide abrasive material in a chemical mechanical polishing solution. According to a method, cerium nitrate or cerium oxalate is used as a cerium source, a cationic or nonionic surfactant is used as a structure-directing agent, and the high-uniformity cerium oxide abrasive material is prepared in a mixed solvent system formed by water and isopropanol or water and diethylene glycol according to a specific volume ratio. The preparation method comprises the following steps: regulating the particle size and the morphology structure through a solvothermal reaction, carrying out cleaning, drying and high-temperature calcination treatment on a reaction product to obtain sphere-like cerium oxide nano-particles with high particle size concentration ratio, moderate surface roughness and good dispersity, adding cerium oxide powder into deionized water, and carrying out ultrasonic dispersion to obtain the spherical cerium oxide nano-particles. And sequentially adding a dispersing agent and amino acid while stirring, uniformly stirring, fixing the volume, and adding a pH regulator to enable the solution to be weakly acidic, thereby obtaining the chemical mechanical polishing solution. The cerium oxide submicron powder which is different in surface appearance, particle size and distribution uniformity is prepared by adjusting the solvent ratio and other reaction conditions.

The invention relates to a pressurized water reactor MOX fuel powder preparation method, which comprises: preparing a mixed actinide eutectic melt from a mixed actinide salt and a urea solid, and carrying out deamination, denitrification / decarbonization and reduction on the mixed actinide eutectic melt to directly obtain MOX fuel powder, the mixed actinide salt is hexavalent actinide nitrate and tetravalent actinide oxalate; when the mixed actinide salt is a uranyl nitrate hexahydrate solid and a thorium oxalate hexahydrate solid, the MOX fuel powder is (UxTh1-x) O2; when the mixed actinide salt is a uranyl nitrate hexahydrate solid and a plutonium oxalate hexahydrate solid, the MOX fuel powder is (UxPu1-x) O2. According to the method provided by the invention, the raw materials are simple, the preparation process flow of the MOX fuel powder composed of UO2 and PuO2 (or ThO2) can be greatly simplified, the use of process reagents is reduced, and no process waste liquid is generated, so that the MOX fuel powder preparation method which is simple, convenient, high in production efficiency, free of waste liquid and more economical and green is provided.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The present invention provides a soil conditioner and a preparation method and application thereof, belonging to the technical field of soil conditioners. The soil conditioner of the present invention comprises the following raw materials in parts by weight: 70 to 90 parts of modified pig manure biochar, 8 to 15 parts of polyaspartic acid, 5 to 10 parts of potassium titanium oxalate, 1 to 3 parts of ammonium molybdate, 40 to 60 parts of calcium silicate, and 20 to 30 parts of lime. The present invention uses a mixed modifier to modify pig manure biochar, which can greatly reduce the content of cadmium and arsenic in edible parts. In addition, the raw materials in the soil conditioner cooperate with each other to reduce the content of heavy metals in the edible parts to the greatest extent.

The invention relates to the technical field of analytical chemistry, and particularly discloses a double-signal ratio type up-conversion luminescent probe, a preparation method thereof and application of the double-signal ratio type up-conversion luminescent probe in oxalate detection, and the double-signal ratio type up-conversion luminescent probe comprises up-conversion nanoparticles UCNPs and an iron-chromium cyanine R compound. The upconversion nanoparticles UCNPs are combined with the iron-chromium cyanine R compound to construct a double-emission-peak regulation and control system, when the system is used for oxalate detection, oxalate can be chelated with Fe < 3 + > in the iron-chromium cyanine R compound, blue shift of an induced absorption spectrum is achieved, green and red emission peaks of the UCNPs are synchronously regulated and controlled, and the detection sensitivity is high. The fluorescent-colorimetric bimodal high-sensitivity detection of the oxalate is realized.

To provide a method for yielding a lithium-containing liquid suitable as a raw material for producing lithium compounds of high purity, from to-be-treated water containing lithium ions, sodium ions, metal ions other than lithium ions and sodium ions, fluoride ions, and anions serving as conjugate bases of acids, and to provide related techniques thereof.SOLUTION: Provided is a method for producing a raw material liquid for a lithium compound, comprising: step 1 of adding a sulfiding agent and a calcium compound to the to-be-treated water, subjecting the to-be-treated water containing the formed solid matter to solid-liquid separation to obtain a treated liquid A; step 2 of adding an oxalate ion source to the treated liquid A, subjecting the treated liquid A containing the formed solid matter to solid-liquid separation to obtain a treated liquid B; and step 3 of subjecting the treated liquid B to bipolar electrodialysis to obtain an alkaline liquid containing lithium ions and sodium ions as a raw material liquid for producing a lithium compound.SELECTED DRAWING: None

The present invention discloses a device and method for producing oxalamide, and relates to the field of chemical production. The method for producing oxalamide provided by the present invention specifically comprises: mixing a methanol solution of liquid ammonia and a methanol solution of dimethyl oxalate to undergo an ammonolysis reaction, flashing, filtering, and drying the first slurry after the reaction to obtain solid oxalamide, refining the liquid phase obtained by solid-liquid separation of the first slurry to obtain byproduct methanol, and washing and absorbing ammonia in the tail gas with dimethyl oxalate and returning to the reaction system. In the process of oxalamide production, the present invention utilizes dimethyl oxalate to react with ammonia in the mixed gas generated during the reaction, and the obtained product continues to undergo subsequent ammonolysis reaction, thereby improving the utilization rate of the reaction materials; at the same time, a condenser is not used to condense ammonia and methanol before separation of alcohol and ammonia, thereby saving condensation equipment and cooling water, reducing production costs, and facilitating industrial production.

The invention relates to the technical field of oxamide synthesis, and provides a microchannel reactor and a method for synthesizing oxamide by using the microchannel reactor. The micro-channel reactor sequentially comprises a feeding area, a reaction area and a discharging area along the flowing direction of reaction materials; the feeding area comprises a main feeding hole; the reaction area comprises an 8-shaped reaction flow channel, and a plurality of segmented feeding holes are formed in the reaction flow channel; the discharging area comprises a discharging opening. According to the micro-channel reactor provided by the invention, full mixing of raw materials can be realized through segmented feeding, the reaction temperature is effectively controlled, and the local temperature is prevented from being too high; when the microchannel reactor provided by the invention is used for synthesizing oxamide, the process is simple, the reaction conditions are mild, efficient conversion of oxalate can be realized in a short time, continuous production of oxamide is realized, and the microchannel reactor is suitable for industrial production.

The invention relates to the technical field of powdered ink, and discloses a plant-based environment-friendly powdered ink composition which comprises the following components: resin, a coloring agent, a charge control agent, wax / a release agent and an additive. The resin comprises polyester resin and bio-based resin. The polyester resin comprises polyhydric alcohol and polybasic acid. The polyol comprises ethylene glycol, neopentyl glycol and a bisphenol A derivative. The polybasic acid comprises terephthalic acid, isophthalic acid and oxalic acid. Compared with the prior art, the plant-based environment-friendly powdered ink composition provided by the invention has the advantages that the plant-based environment-friendly powdered ink composition is based on a plant-oil-based biodegradable material and is prepared from plant oil, polyhydric alcohols and polybasic acid compounds, so that the excellent biodegradability and moisture resistance of the plant oil are kept; and when the resin is used for preparing the biological powdered ink, the biodegradability and moisture resistance of the powdered ink can be effectively improved, and the biological powdered ink prepared from the resin has excellent biodegradability, moisture resistance, performance retentivity and fixing strength.

The present invention discloses an accordion-shaped lignin cubic carbon material, a preparation thereof, and an application thereof in a supercapacitor. The preparation method comprises the following steps: firstly, dissolving industrial lignin in an alkali solution and purifying in a weak acid solution; then forming, with a block copolymer, a mixed micelle of the lignin / the block copolymer in a mixed solvent of alcohol and water, then sequentially adding a soluble zinc salt and a soluble oxalate, and carrying out solvent evaporating induction under a neutral condition to co-deposit the mixed micelle and zinc oxalate, with an evaporation rate at the same time, to deposit the mixed micelle of lignin / block copolymer between zinc oxalate layers, to construct a cubic lignin / block copolymer / zinc oxalate complex with ordered structure; and after finally carbonizing, obtaining an accordion-shaped lignin cubic carbon material. This material has a rich ion migration space and is internally provided with interconnected supporting nanosheet layers so that the problem that carbon nanosheets are easy to accumulate is solved, the effective surface utilization rate is improved, and performances of the mass, the area-specific capacitance and the rate capability of a supercapacitor are remarkably improved.

The invention discloses a regeneration method of a marine vanadium-titanium denitration catalyst. The regeneration method comprises the following steps: (1) immersing a deactivated catalyst into a diluent of a special cleaning agent for grease for cleaning; (2) carrying out spray cleaning on the catalyst cleaned in the step (1), wherein a spray cleaning solution is water; (3) carrying out acid chemical cleaning on the catalyst cleaned in the step (2) to remove alkali metal harmful substances such as sodium, potassium and the like attached to the catalyst; (4) washing the catalyst cleaned in the step (3) with water; (5) drying the catalyst cleaned in the step (4); (6) the catalyst dried in the step (5) is soaked in an active solution for active reimplantation, and the active solution mainly comprises ammonium paratungstate and ammonium molybdate and further comprises one of ammonium metavanadate and vanadyl oxalate; and (7) draining the catalyst subjected to activity reimplantation in the step (6), and putting the catalyst into a calcining furnace for activity activation. According to the method disclosed by the invention, more than 98% of pollutants such as grease, ash, alkali metal and sulfate can be removed, and the use temperature after regeneration is reduced by 20-60 DEG C compared with the original use temperature.

The invention discloses a method for preparing hafnium oxide from hafnium oxalate feed liquid through an oxidation precipitation method, and belongs to the technical field of hydrometallurgy. The specific method comprises the following steps: adding an oxidizing agent into hafnium oxalate feed liquid to destroy oxalate ions in hafnium oxalate so as to enable hafnium to form hydroxide precipitates; and separating the generated white precipitate, and roasting at high temperature to obtain hafnium oxide. The strong oxidant used in the method is low in cost, high in precipitation efficiency, green, environmentally friendly, free of large pollution to equipment and the environment and wide in application range. The method is simple in process, does not involve a complex process flow, does not need precise equipment, avoids a large amount of alkali liquor required by metal ion precipitation, is simpler in process flow, higher in efficiency and lower in cost, avoids the generation of a large amount of wastewater, and is very environment-friendly. And meanwhile, the process is wide in application range and suitable for various oxalic acid metal feed liquid.

The invention belongs to the technical field of synthetic ester, and particularly relates to a preparation method of fatty acid pentaerythritol ester base oil, which comprises the following steps: carrying out esterification reaction on pentaerythritol and fatty acid in the presence of a catalyst and a color retention agent, and carrying out post-treatment to obtain the fatty acid pentaerythritol ester base oil, the catalyst comprises at least one of stannous octoate, stannous oxalate, stannous oxide, tetrabutyl titanate, isopropyl titanate and sodium hydrogen sulfate; the color retention agent comprises at least one of sodium hypophosphite, hypophosphorous acid, activated carbon and sodium sulfite. The color retention agent sodium hypophosphite is matched with the specific catalyst such as stannous oxalate, so that the petroleum color number of the produced fatty acid pentaerythritol ester base oil is smaller, and meanwhile, the esterification reaction time is shorter.

The invention discloses a method for preparing a pore-adjustable carbon molecular sieve through binary activation of heavy oil and application, and belongs to the technical field of biomass resource utilization and water treatment. The method comprises the following steps: (1) mixing heavy oil and a binary activator, and standing to form a carbon-containing precursor mixture; wherein the binary activating agent is calcium citrate and potassium oxalate; (2) performing pyrolysis activation on the carbon-containing precursor mixture in an inert atmosphere, and cooling after the pyrolysis is completed to obtain biological activated carbon; and (3) washing and drying the biological activated carbon to obtain the carbon molecular sieve. The method has the advantages of greenness, environmental protection, convenient process and efficient production. The prepared carbon molecular sieve is developed in pore structure, concentrated in pore size distribution and good in adsorption characteristic, has a wide application prospect in water treatment, and realizes comprehensive treatment of resource utilization of two pollutants, namely waste heavy oil and dye wastewater.

The utility model discloses a rare earth recovery device for a rare earth wastewater solution, and belongs to the technical field of rare earth production. Comprising a cooling box, a precipitation barrel is arranged in an inner cavity of the cooling box, the upper portion of the precipitation barrel and a lower inner cavity of the cooling box are sealed through a sealing plate, an opening of the precipitation barrel is communicated with an upper inner cavity of the cooling box, a feeding pipe and a discharging pipe are symmetrically arranged on the upper portion of the cooling box, and the feeding pipe is communicated with the side wall of the middle of the precipitation barrel; the discharging pipes are communicated with the inner cavities of the upper portions of the cooling boxes, and the discharging pipe of any cooling box is communicated with the feeding pipe of the adjacent cooling box. The precipitation cylinder is arranged in the cooling box, so that the rare earth wastewater can be quickly cooled, the crystallization of praseodymium neodymium oxalate in the rare earth wastewater is accelerated, and the recovery of praseodymium neodymium oxalate is accelerated. In addition, the filter screen disc filters praseodymium neodymium oxalate crystals, excessive filtered praseodymium neodymium oxalate crystals are prevented from entering the next cooling box, praseodymium neodymium oxalate is recycled through the multiple cooling boxes, and waste of praseodymium neodymium oxalate is prevented.

The invention discloses a mother liquor destroying evaporator and a spent fuel post-treatment process system, the mother liquor destroying evaporator comprises a circulation loop for mother liquor to circularly flow, and a heating unit and a separation unit which are sequentially communicated with the circulation loop. The heating unit is used for heating mother liquor, a heated gas-liquid mixture flows to the separation unit through the circulation loop, the separation unit is used for carrying out gas-liquid separation on the gas-liquid mixture, and a liquid phase flows back to the heating unit through the circulation loop, so that one-time evaporation and concentration circulation is completed; and the mother liquor refluxed into the heating unit is continuously subjected to next evaporation and concentration circulation. And the analysis unit is used for analyzing the liquid phase in the sampling loop, opening a concentrated feed liquid outlet according to the analysis result of the analysis unit, and discharging the mother liquor after evaporation and concentration circulation. The mother liquor destroying evaporator can destroy oxalic acid in the mother liquor and realize concentration of the mother liquor at the same time, so that the existing process is improved.

The invention relates to the technical field of organic synthesis, in particular to zinc vanillate and a preparation method and application thereof. The zinc vanillate provided by the invention has a structure as shown in a formula I. Therefore, the zinc vanillate provided by the invention is good in thermal stability at 200 DEG C, and data of the embodiment shows that the zinc vanillate provided by the invention has antioxidant activity and broad-spectrum antibacterial activity. # imgabs0 #

The invention discloses a flame-retardant electrolyte, a preparation method and application in a graphite cathode, the electrolyte comprises a lithium salt, an organic solvent and a film-forming additive, the organic solvent is a mixed solvent comprising fluorinated carboxylic ester and hydrofluoroether, the concentration of the lithium salt in the organic solvent is 2-6 mol / L, and the film-forming additive is lithium bis (oxalate) difluorophosphate. The electrolyte has the beneficial effects that the high-concentration lithium salt in the electrolyte not only ensures the ionic conductivity of the carboxylic ester-based electrolyte, but also forms a solvation structure rich in anions, so that the compatibility of the electrolyte and a graphite negative electrode is improved. The perfluoro solvent and the additive ensure that the SEI film is rich in inorganic components such as LiF, LixPOyFz and the like, and particularly the SEI film rich in LiF effectively improves the compatibility of the EDFA carboxylate-based electrolyte and a graphite negative electrode and the transmission property of interface Li < + >.

The utility model belongs to the technical field of oxalate storage, and particularly relates to a harmless discharging device for volatile organic gas in a dimethyl oxalate storage tank, which comprises a storage tank and a liquid seal tank, the top end of the storage tank is connected with a discharging pipe, and a pressure transmitter for detecting air pressure in the tank is fixedly mounted on the storage tank. A regulating valve I in signal connection with the pressure transmitter is mounted on the discharge pipe, one end, far away from the storage tank, of the discharge pipe extends into the liquid seal tank and is positioned below the liquid level in the liquid seal tank, methanol is contained in the liquid seal tank, and the top end of the liquid seal tank is connected with a tail gas pipe. According to the utility model, organic matter gas in the storage tank is discharged into the liquid seal tank and is washed and dissolved by methanol, so that organic matters are prevented from being discharged into the atmosphere, zero emission of harmful substances is realized, and the device is environment-friendly.

A method for constructing a chicory-poria compound fingerprint, comprising: (1) preparing a test solution from a chicory-poria compound; (2) using chlorogenic acid, 6'-O-β-D-glucosylgentiopicroside, swertiamarin, gentiopicroside, sweroside, 3-O-caffeoylshikimic acid, neoastilbin, astilbin, rutin, isoastilbin, isochlorogenic acid C, quercitrin, kaempferol-3-O-rutinoside, and narcissin to prepare a mixed reference solution; and (3) respectively injecting the test solution and the mixed reference solution into a high performance liquid chromatograph, and performing similarity analysis on the obtained chromatograms to obtain a chicory-poria compound fingerprint. Also provided is a use of the chicory-poria compound fingerprint obtained by means of the construction method in identifying and / or evaluating the quality of a chicory-poria compound. The quality of the chicory-poria compound can be comprehensively, objectively and accurately tested and evaluated, thereby ensuring the safety and effectiveness of patient medication.

The invention relates to the field of hydrometallurgy, and discloses a method for converting hafnium oxalate feed liquid into hafnium oxychloride feed liquid, which is characterized by comprising the following steps: adding an HCl solution and an oxidizing agent into the hafnium oxalate feed liquid, and reacting at a certain temperature to obtain a hafnium oxychloride solution. The method has the advantages of simple operation, no introduction of any metal impurity ions, small reagent consumption, low energy consumption, low cost, high efficiency, no physical state change, and realization of continuous production. The method for adding the HCl solution and the oxidizing agent into the oxalate feed liquid is also suitable for converting oxalate solutions of other metal ions into chloride solutions, including but not limited to zirconium oxalate, titanium oxalate, thorium oxalate, scandium oxalate, niobium oxalate, tantalum oxalate, vanadium oxalate, cobalt oxalate, cesium oxalate and rubidium oxalate.

To provide a nonaqueous electrolyte power storage element having a high recovery capacity retention rate after storage under a high-temperature environment.SOLUTION: The nonaqueous electrolyte power storage element according to one embodiment of the present invention includes: a positive electrode which contains a lithium transition metal oxide having a spinel type crystal structure and containing a manganese element; and a nonaqueous electrolyte. The lithium transition metal oxide is particles in which the ratio of an average particle diameter to an average primary particle diameter is 5 or less. The nonaqueous electrolyte contains at least one compound selected from the group consisting of a salt which has an anion having a double bond between a sulfur atom or a phosphorus atom and an oxygen atom and containing no nitrogen element, a salt having an oxalate complex anion, an unsaturated cyclic carbonate, and a cyclic compound having a double bond between a sulfur atom and an oxygen atom.SELECTED DRAWING: Figure 1

The invention provides a preparation method of micron-sized spherical silver-coated copper powder for the electronic industry, and belongs to the technical field of conductive materials.The preparation method comprises the steps that a copper sulfate solution and ethyl alcohol react to obtain a first solution; adding an ammonium oxalate solution into the first solution to obtain slurry; adding a silver nitrate solution and an ammonium oxalate solution into the slurry, and performing stirring, standing and vacuum drying to obtain an oxalate precursor precipitate; mixing the oxalate precursor precipitate with stearic acid, carrying out first vacuum mixing and kneading, adding fumed silica particles, and carrying out second vacuum mixing and kneading to obtain powder; and heating the powder to 135-145 DEG C in a vacuum state, preserving heat for 1.5-2.5 hours, continuously heating to 270-320 DEG C, preserving heat for 1.5-2.5 hours, cooling to room temperature along with a furnace, and carrying out acid pickling, suction filtration, washing, drying and sieving. The micron-sized spherical silver-coated copper powder is high in oxidation resistance, short in process period and high in yield.

An electrolyte solution, an electrochemical device and an electronic device. The electrolyte solution comprises at least two of an additive I, an additive II and an additive III. The additive I is selected from at least one additive in a group consisting of a compound as represented by formula 1a below, a compound as represented by formula 1b, and lithium difluorophosphate; the additive II is selected from at least one additive in a group consisting of lithium fluorosulfonate, bis(fluorosulfonyl)imide, and bis(trifluoromethanesulfonyl)imide; and the additive III is selected from at least one additive in a group consisting of lithium difluoro(oxalato)borate, lithium bis(oxalato)borate and lithium tetrafluoroborate. The electrolyte solution can improve the low-temperature characteristics, impedance and thickness swelling rate of an electrochemical device.

The invention relates to the technical field of pharmaceutical and chemical engineering, and particularly discloses a method for preparing oseltamivir, oseltamivir is prepared through thionyl chloride esterification, cyclization, Mitsunobu amino substitution, selective ring opening, TEMPO oxidation, transaminase enzyme catalysis, acylation and deprotection, esterification, oxidation and protection groups are classical reactions, then enzyme catalysis is combined for selective amino substitution, and the oseltamivir can be prepared. According to the present invention, the cheap shikimic acid is adopted as the starting material, the whole process is simple, the harmful material is not used, the enzyme catalysis reaction and the directional overturning group are adopted, the possibility of the compound racemization is substantially reduced, the operation is simple, and the yield of the whole process route is stable.

The invention provides a method for removing nitric oxide in tail gas generated in preparation of oxalate through CO coupling, and relates to the technical field of nitric oxide treatment. The invention relates to a method for removing nitrogen oxides in tail gas generated in preparation of oxalate through CO coupling, which comprises the following steps: in the shutdown process of a coupling reaction system, S1, introducing the tail gas material flow generated in preparation of oxalate through CO coupling into an absorption tower A to contact with an alcohol compound, discharging the obtained effluent I from the tower top, discharging the effluent II from the tower kettle, and circulating the effluent II back to the coupling reaction system; and S2, discharging the effluent I from the tower top, introducing the effluent I and oxygen-containing gas into an absorption tower B, and carrying out absorption treatment by adopting first absorption liquid. The method has the advantages of economy, high efficiency, environmental protection and the like.