87 results about "Round-bottom flask" patented technology

The invention relates to the technical field of catalysts, and discloses a preparation method of a supported catalyst for catalytic cracking oil slurry hydrogenation, and the preparation method comprises the following steps: S1, adding a phosphorus-containing compound into a carrier for modification: putting the carrier, phosphate and phosphoric acid into a round-bottom flask, adding water, and stirring for reaction to obtain a P element modified carrier; s2, dissolving a main active component of the catalyst in deionized water, then slowly adding into the P element modified carrier prepared in the step S1, and reacting to obtain a carrier loaded with the catalyst; and S3, roasting the catalyst-loaded carrier prepared in the step S2 to obtain the supported catalyst. According to the supported catalyst, a phosphorus compound modified carrier is adopted, and Ni-W-Mo or Ni-W active metal components are supported. The acid site of the carrier is optimized by adding the phosphorus element, and the surface acidity and the acid amount of the catalyst are optimized and adjusted by using a preparation process combining a microwave method and a co-impregnation method, so that the thermal stability of the catalyst is improved.

The present invention generally relates to a process for synthesizing neodymium-based metal-organic frameworks (Nd-PTA-MOF), comprising: dissolving 166.13 mg of neodymium nitrate hexa-hydrate in 2 ml of distilled water to form a first solution; dissolving 80 mg of pyridine-2,4,6-tri-carboxylic acid (PTA) in 5 ml of distilled water to form a second solution; mixing the first solution and the second solution in a round bottom flask with magnetic stirring while heating; adding two drops of liquid ammonia to the mixture; refluxing the mixture for 2 hours at a temperature in the range of 120-150° C.; allowing the mixture to crystallize over a period of seven days to form purple-colored Nd-PTA-MOF crystals; washing the formed Nd-PTA-MOF crystals with distilled water and acetone; and fabricating an electrode for developing a hybrid supercapacitor.

The invention discloses a high-ammonia-nitrogen wastewater treatment process, and belongs to the technical field of pyridine wastewater treatment, and the high-ammonia-nitrogen wastewater treatment process comprises the following steps: preparing hydrotalcite: weighing cobalt nitrate, magnesium nitrate and aluminum nitrate, adding distilled water, and stirring to obtain a salt solution; weighing sodium hydroxide and anhydrous sodium carbonate, adding distilled water, and stirring to obtain alkali liquor; pumping the salt solution and the alkali solution into a round-bottom flask, and heating and dispersing the round-bottom flask on an oil bath pan; putting the ground sample into a ceramic crucible, calcining in a muffle furnace, weighing a silver-ammonia solution and acetaldehyde, and pouring into a round-bottom flask; the pyridine wastewater is weighed, the hydrotalcite is added, stirring adsorption is performed for 20 min, the hydrogen peroxide is added, suction filtration is performed after the reaction, and the hydrotalcite is filtered and separated out for recycling. The problem that existing wastewater treatment is difficult is solved. The method has the advantages of high catalytic activity, easiness in recovery and reutilization of hydrotalcite, no need of adding any auxiliary chemical reagent, mild reaction conditions, low cost and convenience in operation, and can meet the requirements of industrial production.

The invention relates to the technical field of organic synthesis, in particular to acrylamido triazine and a preparation method and application thereof.The preparation method comprises the steps that 126 g of melamine is weighed and placed in a three-opening round-bottom flask, 600 g of water and 2-10 g of polymerization inhibitor are added and stirred to be uniform, 60-260 g of acrylic acid is dropwise added, the mixture is heated to 100-140 DEG C, the reaction time is 6-10 h, and a reaction solution is obtained; and filtering the reaction liquid while the reaction liquid is hot, washing a filter cake with water, acetone and ethanol respectively, and drying to obtain the acrylamido triazine. The prepared 1-acrylamide triazine can be used for free radical polymerization reaction to prepare linear formaldehyde-free polymer resin with a triazine ring as a unit structure; the prepared 1, 3-diacrylamido triazine and 1, 3, 5-triacrylamido triazine can perform or participate in free radical polymerization reaction between other unsaturated double bonds to prepare a polymer with a cross-linked structure, and a technical route for preparing an aldehyde-free high-molecular polymer based on melamine is broken through in an application technical method.

The invention relates to the field of vegetable preservation, and discloses a preparation method of a volatile oil preservative and application of the volatile oil preservative in artemisia selengensis preservation, and the method comprises the following steps: step 1, weighing waste leaves and stems of artemisia selengensis, adding a sodium chloride solution, crushing with a juicer, then transferring into a round-bottom flask, enabling the round-bottom flask to be hermetically connected with a volatile oil steam distillation device to extract artemisia selengensis volatile oil, receiving volatile oil by using a centrifugal tube, and transferring the upper layer artemisia selengensis volatile oil by using a pipette; and step 2, weighing a hydrophilic emulsifier sucrose ester and chitosan powder, slowly adding the hydrophilic emulsifier sucrose ester and chitosan powder into the acetic acid solution, stirring while adding to avoid agglomeration, stirring at room temperature until the hydrophilic emulsifier sucrose ester and chitosan powder are completely dissolved to form a transparent or slightly milky white solution, adding the extracted artemisia selengensis volatile oil and glycerol, stirring in a sealed manner at room temperature, and degassing to obtain the artemisia selengensis volatile oil preservative. According to the method, a closed loop of waste recycling, preservative and homologous vegetable preservation can be realized, and the shelf life of artemisia selengensis is prolonged; meanwhile, the artemisia selengensis volatile oil has a certain compensation effect on the loss of the flavor of the clean artemisia selengensis.

The invention discloses a nano-enzyme detection method for aflatoxin B1, and relates to the technical field of analysis and detection.The method comprises the following specific steps that nano-enzyme preparation and carrier selection are conducted, specifically, nano-gold is prepared through a sodium citrate reduction method to serve as the nano-enzyme, a chloroauric acid solution is added into a round-bottom flask and heated to be boiled, and a carrier is obtained; according to the method, the PNIPAM serves as an immobilization carrier of the nano-enzyme, reversible immobilization of the nano-enzyme is achieved, cyclic utilization of the nano-enzyme is promoted, the detection cost is reduced, after detection is completed, phase change of the PNIPAM can be achieved by changing environmental conditions, and therefore effective separation of nano-gold and the carrier is achieved; after the recovered nanogold is washed and subjected to re-functionalization treatment, the catalytic activity of the nanogold is maintained, and the nanogold can be used for detecting aflatoxin B1 again, so that the utilization rate of the nano-enzyme is increased, and the waste of resources is reduced.

This invention belongs to the field of carbon dioxide reduction technology, and relates to an oxygen-resistant photocatalytic reduction catalyst for carbon dioxide, its preparation method, and its application. The catalyst synthesis steps are as follows: Bi(NO3)3·5H2O is dissolved in a mixed solution of ethylene glycol and deionized water to obtain solution A; KBr is dissolved in ethylene glycol to obtain solution B. Solutions A and B are sonicated separately for half an hour, then mixed and transferred to a round-bottom flask, and stirred and heated at 100℃~200℃ for 1h~10h. After cooling to room temperature, the precipitate is collected by centrifugation, washed and soaked, and then heated and dried overnight to obtain BiOBr-V. O -X-ray photocatalyst. The BiOBr-V prepared in this invention O X-ray photocatalysts have high oxygen resistance, high catalytic efficiency and CO selectivity, and can use natural light as a light source to directly utilize CO2 in the air without further separation and purification.

The invention relates to a nanocrystallization preparation method and application of micromolecular panax notoginseng polysaccharide, and belongs to the field of biological medicine. The method comprises the following steps: (1) weighing a certain amount of micromolecular panax notoginseng polysaccharide, lecithin, lanolin and triton X-100, dissolving in absolute ethyl alcohol, carrying out rotary evaporation to remove ethyl alcohol, and forming a uniform and transparent film on a bottle wall; (2) adding a PBS (Phosphate Buffer Solution) into the round-bottom flask to wash the film on the bottle wall so as to obtain a film-washed solution; (3) carrying out ultrasonic treatment on the membrane-washed liquid, and standing for a certain period of time to obtain a small-molecular panax notoginseng polysaccharide nano raw material; (4) placing in an ultrafiltration centrifuge tube, centrifuging, and collecting filtrate; and (5) concentrating the filtrate, and freeze-drying to obtain the micromolecular nano pseudo-ginseng polysaccharide extract. When the micromolecular nano pseudo-ginseng polysaccharide extract prepared by the preparation method disclosed by the invention is used for preparing cosmetics with a moisturizing function, the moisturizing performance is remarkable.

The invention discloses a preparation method of nano sulfur, which comprises the following steps: (1) adding 5-10 g of sublimed sulfur and 50 mL of N-methyl pyrrolidone into a 300 mL round-bottom flask, then placing the round-bottom flask in an oil bath at 25-125 DEG C, and stirring for 15-60 min; and (2) filtering the mixture to take filtrate, then adding the filtrate into a 300 mL beaker, adding 100-200 mL of deionized water into the beaker at one time at normal temperature under vigorous stirring, and continuously stirring for 5-10 minutes. And (3) centrifugally separating the mixture at 8000-12000 rpm for 5-10 min or filtering the mixture to obtain a precipitate, and washing the precipitate with deionized water for 3 times. And (4) placing the washed precipitate in a vacuum drying box at 80 DEG C, and drying for one night to obtain the nano sulfur. Researches show that sublimed sulfur is taken as a raw material, N-methyl pyrrolidone is taken as a solvent, deionized water is taken as a titration solvent, nano sulfur is prepared by adopting a heterogeneous titration method, and the method is simple in process, easy to operate, easy in condition control, low in synthesis cost and suitable for industrial large-scale production.

The present application relates to the technical field of pharmaceutical equipment, and particularly relates to a kind of oscillation type reduced pressure distillation waterization equipment for preparing complex injection, such as micelle, liposome, microsphere and the like, which comprises: oscillation cavity, multiple partitions are arranged in the oscillation cavity, vibration device is arranged at the bottom of the oscillation cavity, for wave type or hinged plate type vibration of the oscillation cavity;Evaporation box, the evaporation box is the cavity structure arranged on each partition, the bottom of any one end is provided with a discharge interface, the top is connected with the vacuum feed pipe penetrating the outer wall of the oscillation cavity, the vacuum feed pipe is connected with the valve pipeline connected with the vacuum pump through the interface;In addition, the evaporation box is provided with a heater at the bottom.The present application uses multiple evaporation boxes to replace rotary evaporation round bottom flask, expands the one-time evaporation capacity, realizes the scale-up production of related pharmaceutical preparations in industrial production, forms ideal film layer at the bottom of the box by vacuum pump and heater, and also integrates the whole preparation method of film waterization into the equipment, avoids the risk of material pollution in transfer.

The invention discloses a method for directly preparing a racemic oxidation product from a fennerenone enantiomer through photocatalysis, and belongs to the technical field of organic synthesis.The method comprises the steps that an R-type fennerenone isomer is taken to be placed in a reaction bottle, a photosensitizer containing iridium or ruthenium is added, and a solvent is added at the speed of 0.1 M in the air atmosphere; the method comprises the following steps: dissolving 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2, 8-dimethyl-1, 6-naphthyridine-3-formamide in a solvent, stirring, transferring a mixture into a photoreactor of a blue light LED (Light Emitting Diode) with the wavelength of 455-465 nm, stirring, transferring a mixed solution after the reaction is finished into a round-bottom flask, purifying a volatile solvent to obtain a product 4-(4-cyano-2-methoxyphenyl)-5-ethoxy-2, 8-dimethyl-1, 6-naphthyridine-3-formamide, and carrying out chiral HPLC (High Performance Liquid Chromatography) analysis on the product. High temperature, high pressure or a strong oxidant is not needed, and reaction conditions are mild; oxygen in air is oxidized at room temperature, so that energy consumption and pollutant generation are reduced; compared with the traditional oxidation condition, the method does not need to undergo the process of oxidation first and then high-temperature induced racemization, and the racemization product can be directly obtained.

The application discloses a kind of anti-icing super-hydrophobic material preparation methods, with aluminum plate as substrate;First, blast furnace slag powder and steel slag powder are treated with hydrophobic modification, blast furnace slag powder and steel slag powder are mixed according to certain mass ratio, mixed powder and organic solvent A absolute ethyl alcohol are stirred in round bottom flask, after solution is fully mixed, organic solvent B seventeen fluorine decyl triethoxysilane is added and transferred to water bath heating tank water bath heating and stirring;Modified blast furnace slag-steel slag powder, organic solvent C butyl acetate are uniformly mixed according to 3:8 ratio, after reaction ten minutes, two-component polyurea is added drop by drop, and super-hydrophobic coating is obtained by drying.The present application uses blast furnace slag waste as main raw material, adds a small amount of steel slag to improve the wear resistance of coating, uses two-component polyurea as adhesive, uses modified-spraying two-step method, without large instrument equipment, and super-hydrophobic coating with excellent wear resistance is prepared simply and quickly.

This invention discloses a fluorescent sensitive membrane for detecting mercury ions in water and its preparation method. The sensitive membrane comprises a fluorescent probe and a physically cross-linked matrix. The fluorescent probe is prepared using 7-(diethylamino)coumarin-3-carboxaldehyde, 3-methyl-2-benzothiazolidinone hydrazone hydrochloride, and ethanol. Chitosan, glycerol, and acetic acid solutions are then added to a round-bottom flask and stirred until the chitosan is completely dissolved. Next, 4-(4,6-dimethoxytriazine-2-yl)-4-methylmorpholine hydrochloride is added, and stirring continues at room temperature to obtain a clear and transparent solution. The fluorescent probe is then added, and stirring continues. Finally, the solution is poured into a glass dish to evaporate the solvent, yielding the mercury ion detection solution. 2+ A fluorescently sensitive membrane. This membrane is sensitive to Hg in water. 2+ It has a detection function, requires no sample preparation during detection, and has the advantages of simple detection method and high detection efficiency.

The invention relates to the technical field of chemical preparation, in particular to a preparation method of gamma-thiocyano propyl triethoxy silane, which comprises the following steps: adding acetonitrile and tetrabutyl ammonium thiocyanate into a reaction container, dropwise adding 3-chloropropyl triethoxy silane into a four-mouth round-bottom flask while stirring, and controlling the dropwise adding time; the preparation method comprises the following steps: heating to 30-40 DEG C, reacting for 1.5-3 hours, cooling to room temperature, adding an ice-saturated sodium chloride solution into a reaction container to obtain a mixed solution, extracting the mixed solution, taking an organic layer, sequentially washing, drying and filtering, and respectively carrying out vacuum concentration and vacuum rectification on filtrate to obtain the gamma-thiocyano propyl triethoxy silane. The preparation method of the gamma-thiocyano propyl triethoxy silane provided by the invention is carried out under an anhydrous condition, so that hydrolysis and condensation side reactions of silane caused by a water-phase synthesis method are effectively avoided, meanwhile, the generation of irritant gases such as hydrogen sulfide and the like is avoided, and the preparation method is safer to operate, environment-friendly and more suitable for industrial popularization.

The invention discloses a method for preparing a dye separation membrane based on hydrogen-bond interaction and coordination of phytic acid, which comprises the following steps: putting PES, PVP, PA, NMP and formamide into a round-bottom flask, putting the round-bottom flask into a water bath kettle, stirring, standing at the same temperature to remove bubbles, then casting a casting solution on a glass plate by using a steel knife, immersing into a FeCl3 coagulating bath for soaking, and drying to obtain the dye separation membrane. And immersing the membrane in deionized water to remove the residual solvent to obtain the dye separation membrane. The preparation method comprises the following steps: by taking polyether sulfone as a membrane-forming main polymer, polyvinylpyrrolidone as a pore-forming agent, phytic acid as a surface segregation agent and N-methyl pyrrolidone and formamide as solvents, heating and stirring to form a membrane casting solution, and taking a coagulation bath as a FeCl3 solution; in the non-solvent induced phase inversion process,-PO3H2 of PA is coordinated with Fe < 3 + >, hydrophilic micromolecules are fixed on the surface of the membrane through hydrogen-bond interaction with PVP, a large number of water molecules are attracted, and a firm hydration layer is constructed on the surface of the membrane.

The invention belongs to the technical field of chemical analysis and detection. The invention provides a platinum complex fluorescent probe as well as a preparation method and application thereof in detection of water. The chemical formula of the platinum complex fluorescent probe is C23H16ClN3Pt; the preparation method comprises the following steps: 1, under the protection of argon, mixing terpyridine, potassium tetrachloroplatinate, deionized water and dimethyl sulfoxide in a round-bottom flask, heating, stirring, carrying out reflux reaction, cooling to room temperature, adding concentrated hydrochloric acid, carrying out suction filtration to obtain a precipitate, and drying to obtain Pt-Cl; 2, Pt-Cl, phenylacetylene, cuprous iodide, N, N-dimethylformamide and triethylamine are mixed into a round-bottom flask, then argon is pumped and replaced for multiple times, after a reaction, suction filtration is conducted, precipitates are obtained, washing and drying are conducted, and the catalyst is obtained. The platinum complex fluorescent probe is applied to detection of water and has the advantages of specific selectivity, high sensitivity, wide detection concentration range and the like, so that the detection can better meet the current requirements.

The invention discloses a green synthesis method for preparing micron spherical silver powder from green soybean pod extract. The green soybean pod extract is used as a reducing agent, and silver nitrate is used as a silver source. The preparation method comprises the following steps: cleaning, drying and crushing green soybean pods, putting the crushed green soybean pods into a round-bottom flask, connecting a reflux condensing tube, adding deionized water in a ratio of 1: 10, heating to boil, and keeping a reflux state for 1-3 hours; and after the reflux is finished, cooling the extracting solution, filtering to remove filter residues to obtain a green soybean pod crude extracting solution, carrying out ion exchange resin chromatography and water elution on the crude extracting solution to obtain a green soybean pod eluent, and carrying out vacuum concentration and drying to obtain the green soybean pod extract. Adding a dispersing agent into the silver nitrate solution, adjusting the pH value to 7, and then adding the mixed solution into the green soybean pod extract solution to obtain a mixed solution; and the mixed solution is magnetically stirred for 10 min, and then the micron spherical silver powder is obtained through high-speed centrifugation, xenon lamp irradiation, azeotropic distillation, washing and drying. The micron spherical silver powder prepared through the method is high in sphericity degree, good in fluidity and high in purity.

The invention belongs to the technical field of natural product extraction, and provides a preparation method of sapindoside. The preparation method comprises the following steps: (1) raw material pretreatment: selecting dried soapberry peel, removing impurities, and crushing to obtain soapberry powder; (2) saponin extraction: taking 4 parts of equal soapberry powder, and respectively adding the soapberry powder and the ionic liquid into a round-bottom flask according to different mass ratios; performing ultrasonic extraction to obtain an extracting solution; respectively filtering the four groups of extracting solutions, and merging the four groups of extracting solutions into the same container to obtain a primary extracting solution and filter residues; and (3) sequentially separating, purifying and concentrating the primary extract, and drying to obtain solid powder of the sapindoside. According to the preparation method, the high-purity, high-yield, high-activity and low-impurity sapindus saponin is prepared through combination of directional extraction of the compound ionic liquid, multi-proportion gradient dissolution, low-temperature activity protection, green solvent circulation and the like on the sapindus pericarp, the application field range is wide, and the whole preparation process is green, environmentally friendly and sustainable.

The application discloses a benzyl benzoyl or fluorinated alkane substituted phenol compound and a synthesis method and application thereof, and belongs to the technical field of drug synthesis. The synthesis method comprises the following steps: step one, 0.3mmol of o-aminobenzamide, 0.3mmol of ketone, 10mol% of I2 and 5mL of anhydrous ethanol are added into a 10mL round-bottom flask at one time, stirring is carried out at 80 DEG C for 24h, after the reaction is completed, the reaction liquid is poured into ice water, the volume ratio of the reaction liquid to the ice water is 1:10, ethyl acetate is extracted, the organic layer is washed with saturated brine, dried with anhydrous Na2SO4, and spin-dried to obtain a crude product. The synthesis method has the advantages of mild reaction condition, few side reactions and simple and convenient operation. And the benzyl benzoyl or fluorinated alkane substituted phenol compound obtained by the application has the effect of resisting colon cancer.

This solution discloses an ammonia nitrogen pre-distillation device in the field of pretreatment technology before the detection of harmful components in wastewater, comprising a round-bottom flask, the round-bottom flask comprising a bottle body and a bottleneck, the bottleneck being connected to a branch pipe that is detachably connected to the condenser; further comprising a cleaning assembly, the cleaning assembly comprising a lifting rod and a scraper connected to one end of the lifting rod, the scraper being evenly distributed with a number of air holes, the scraper being located in the bottleneck and the edge of the scraper being in contact with the inner wall of the bottleneck, the lifting rod sliding through the plug; a drain port being provided on the bottleneck, the drain port being located between the branch pipe and the bottle body, a sealing plug for sealing the drain port being provided at the drain port, the sealing plug being located at one end in the bottleneck being connected to a brush rod, the brush rod being evenly distributed with a number of bristles, the end of the bristles being in contact with the wall of the bottleneck. This solution can effectively prevent the branch pipe from being blocked, and can also prevent floating objects from entering the condenser. The structure is simple but the effect is outstanding, the operation of cleaning the foam can be carried out quickly, and does not affect the distillation process.

The invention discloses an improved method suitable for a'volatile substance molar mass determination 'experiment in a physical and chemical experiment established in a higher school. Comprising the following steps: S1, firstly, lapping a device, and replacing an original Meijoa method steam density measuring device with an improved two-mouth round-bottom flask and a soap film flowmeter; s2, replacing an original three-way piston with a T-shaped pipe; and S3, replacing glass bubbles with a medical injector sample injection mode. Experiment results show that the improved experiment is simple in operation and obvious in phenomenon, experiment cost and uncertainty are reduced, and the method is more suitable for grouping experiments of students.

The application provides a preparation method of a multifunctional drug carrier, and the multifunctional drug carrier is curcumin-loaded nanoliposomes prepared by adopting a thin film dispersion method combined with dynamic high pressure microfluidization (DHPM), and the preparation method comprises the following steps: adding phospholipid, cholesterol, FA-F87, TPGS and curcumin into anhydrous ethanol for dissolving, transferring the solution to a 1000 mL round-bottom flask after the solution is completely dissolved to a clear state, and placing the solution on a rotary evaporator for removing ethanol by evaporation under reduced pressure to form a lipid film; the lipid film is hydrated under normal pressure at 45 DEG C for 30 min to obtain a curcumin coarse liposome solution; and the curcumin coarse liposome solution is treated twice by DHPM under the condition of 120 MPa to obtain the curcumin-loaded nanoliposomes; the curcumin-loaded nanoliposomes prepared by the application have good biocompatibility and stability, can improve the stability, solubility and drug release performance of a drug, and further improve the drug delivery effect and therapeutic effect of the drug.

The invention relates to the technical field of batteries, and discloses an electrolyte preparation method, an electrolyte, an ultrahigh-power lithium thionyl chloride battery and a manufacturing method. The method comprises the following steps: adding solid anhydrous gallium chloride and anhydrous lithium chloride into a round-bottom flask in an argon protection environment, and heating to melt the anhydrous gallium chloride and the anhydrous lithium chloride into liquid; after the round-bottom flask is cooled, thionyl chloride is added into the round-bottom flask and stirred to be partially dissolved, then chlorosulfonic acid is added so that transparent floccules can appear in the solution in the round-bottom flask, a condensation reflux device is installed on the round-bottom flask, and the round-bottom flask is heated so that the transparent floccules in the solution can be completely dissolved. The method comprises the following steps: adding a metal elementary substance lithium sheet into a round-bottom flask in an environment with the relative humidity of less than 1%, installing a condensation reflux device, heating to remove impurities in a solution, cooling the round-bottom flask, enabling sulfur dioxide to sequentially pass through a concentrated sulfuric acid and calcium chloride scrubbing device, and then introducing the sulfur dioxide into the round-bottom flask to remove moisture in the solution so as to prepare the electrolyte.

The invention relates to the technical field of batteries, in particular to an electrolyte additive, a preparation method of the electrolyte additive, an electrolyte and a battery, the electrolyte additive has a chemical structure as shown in a formula (A): # imgabs0 # formula (A), and the preparation method of the electrolyte additive comprises the following steps of: preparing the electrolyte additive according to the formula (A): # imgabs0 # formula (A): # imgabs0 # formula (A): # imgabs0 # formula (A): # imgabs0 # formula (A), comprising the following steps: 1, mixing a reactant I, a reactant II and a catalyst Ni-CeO2 according to a molar ratio of (0.8-1.4): (0.6-1.3): 0.2, uniformly stirring, placing in a drying oven, reacting, taking a supernatant, washing a lower-layer solid with DMC, mixing the supernatant with a DMC solution collected by washing the lower-layer solid, transferring into a round-bottom flask, carrying out oil bath heating to obtain reaction products at different temperatures, and carrying out vacuum drying on the reaction products, so as to obtain a reaction product I, a reaction product II and a catalyst Ni-CeO2; the electrolyte comprises an electrolyte salt, an organic solvent and the electrolyte additive, the lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and the electrolyte, the conductivity of the electrolyte can be improved, and the decomposition voltage of the lithium supplement agent can be reduced.

This invention discloses a method for synthesizing 2-benzamido-2-phenyl-3-vinyl-1-indanone, relating to the field of chemical synthesis technology of 2-benzamido-2-phenyl-3-vinyl-1-indanone. This invention comprises the following steps: S1: At room temperature, N-(aryl(p-toluenesulfonyl)methyl)amide (0.5 mmol), thiazolyl carbene precursor (40.5 mg, 0.15 mmol, 30 mol%), and o-alkynylbenzaldehyde (0.75 mmol) are added to a dry double-necked round-bottom flask. Under a high-purity nitrogen atmosphere, dry acetonitrile (5 mL) is added using a syringe. The reaction mixture is stirred under nitrogen purging. Et3N (126.3 mg, 1.25 mmol, 2.5 equiv.) is added using a microsyringe. S2: The reaction mixture is stirred under a nitrogen atmosphere to quench the reaction. After removing the solvent, the residue is separated by silica gel column chromatography (PE:EA = 4:1 to 3:1) to obtain the o-amidoketone intermediate. The synthetic method of this invention has high reaction efficiency, easily introduces chiral carbon, has high stereoselectivity, is novel in both method and product, and has a yield of 82%.

The present invention discloses a support and method for placing a round-bottom flask, the support comprising: a flask holder and a flask connector; the flask holder comprising: a flask bottom clamp, a connector and a first fixing member connected in sequence, wherein: the first fixing member is located above the flask bottom clamp and forms a fixed angle with the flask bottom clamp in the vertical direction; the flask connector comprises: a second fixing member located above the first fixing member and detachably connected to the first fixing member, the second fixing member being connected to one end of a flask fixing structure, the flask fixing structure forming the fixed angle with the flask bottom clamp in the vertical direction, and the other end of the flask fixing structure being connected to a gripping portion. The present invention can ensure that the flask is placed in the flask bottom clamp at a fixed angle, making it convenient for a robot to position and grip it. At the same time, a gripping portion connected to the flask fixing structure is provided, which can facilitate the experimental robot to position the gripping position and can firmly grip the flask to prevent the flask from falling.

The invention provides a phosphate ammonium salt ionic liquid, a preparation method and application of the phosphate ammonium salt ionic liquid in a lubricating composition, cations of the phosphate ammonium salt ionic liquid are ammonium salt cations with different alkyl chain lengths, anions of the phosphate ammonium salt ionic liquid are phosphate with different chain lengths, and the preparation method of the ionic liquid comprises the following steps: adding alkylamine and phosphate into a round-bottom flask; and heating for 2-24 hours, and cooling to obtain the phosphate ammonium salt ionic liquid. The phosphate ammonium salt ionic liquid is used as a lubricant additive to be applied to a lubricating composition, so that the antifriction performance, the antiwear performance and the anti-rust performance of base oil are remarkably improved.

The invention belongs to the technical field of high polymer materials, and discloses a method for preparing a polyamide nanofiltration membrane based on non-reactive ionic liquid, which comprises the following steps: preparation of a substrate PES membrane: weighing 16wt% of polyether sulfone PES, 16wt% of polyethylene glycol PEG and 68wt% of N-N dimethylformamide DMF, putting into a round-bottom flask, stirring in a water bath kettle, standing at the same temperature to remove bubbles, and then, adding the substrate PES membrane into the round-bottom flask to obtain the substrate PES membrane; casting the casting solution on a glass plate by using a steel knife, and immersing the glass plate in ultrapure water to remove the residual solvent; and preparation of a polyamide (PA) membrane: carrying out interfacial polymerization on a water phase solution containing piperazine (PIP) and chlorinated 1-butyl-3-methylimidazole and an oil phase solution containing TMC, and synthesizing a polyamide active layer on the PES membrane. The invention provides a new view angle for regulation and control of monomer diffusion and reaction in the interfacial polymerization process, and particularly has important application potential in the aspect of preparation of high-performance polyamide composite membranes.

This application discloses a method for preparing a porous heterojunction vanadium-based aqueous zinc battery cathode and its application. First, FeCl3·6H2O and fumaric acid are dissolved in deionized water and stirred vigorously. The suspension is then transferred to a round-bottom flask for oil bath treatment. After cooling, the solution is washed and dried to obtain product MIL-88A. Next, NH4VO3 is dissolved in deionized water and stirred in an oil bath until completely dissolved. MIL-88A is dispersed in ethanol and added dropwise to the NH4VO3 solution with stirring. After cooling to room temperature, the solid product is centrifuged with water and ethanol respectively, and finally vacuum dried. The product is then heated using a muffle furnace to obtain a FeVO3 porous heterojunction oxide. This cathode material can reduce the zinc ion diffusion barrier, improve electron transport generated by the built-in electric field at the interface, and significantly improve its rate performance. The porous structure formed by its activation can reduce the diffusion barrier and improve the structural stability of the aqueous zinc battery cathode.

The present invention discloses a method for synthesizing nitrogen oxides from aniline. Using a micro-droplet reaction device, an aqueous solution of an aniline compound of a certain concentration is sprayed. The resulting target product is collected in a round-bottom flask and separated to obtain nitrogen oxides. This method solves the problem of harsh reaction conditions and the need for catalysts in the prior art of preparing nitrogen oxides from aromatic amines. Furthermore, the method is green, mild, catalyst-free, rapid, and has a high yield.