120 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 a method for using a choline eutectic solvent as a carbon dioxide absorbent. A choline eutectic solvent is used in the method. Wherein the choline eutectic solvent is prepared by mixing choline chloride (ChCl) and ethanolamine (MEA) according to a molar ratio of 1: 5. Placing the round-bottom flask filled with ChCl and MEA in a constant-temperature magnetic stirring oil bath pan, and heating and stirring for more than 3 hours at the temperature of 100 DEG C; and after a uniform and transparent solution is formed in the flask, taking out the solution from the oil bath pan, and standing to room temperature. Transferring into a reagent bottle, and pasting a label for later use. The choline deep-eutectic solvent is simple in preparation method and low in toxicity, and is an efficient carbon dioxide absorbent.

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 particle size controllable silicon dioxide nano-microsphere and a preparation method thereof, and particularly relates to the technical field of preparation of silicon dioxide nano-microspheres, and the particle size controllable silicon dioxide nano-microsphere comprises a silicon dioxide nano-microsphere body. The invention relates to a preparation method of silicon dioxide nano-microspheres with controllable particle sizes. The preparation method comprises the following steps: step 1, preparing a silicon dioxide microsphere dispersion liquid by adopting a stber method; 2, centrifuging, washing and freeze-drying the silicon dioxide microsphere dispersion liquid to obtain submicron silicon dioxide seed microspheres; 3, a certain amount of ethyl alcohol is added into a round-bottom flask, a certain amount of silicon dioxide seed microspheres are taken and dispersed in the ethyl alcohol, dispersion liquid a is obtained and subjected to ultrasonic oscillation for 1 h, and then a certain amount of ammonia water and water are added to prepare dispersion liquid b; according to the preparation method, the particle size control can be realized, and the uniform micron-sized silicon dioxide microspheres can be efficiently and economically obtained, so that the requirements of the market on high-performance materials are met, and the influence of the production process on the environment is reduced.

The invention discloses a preparation method and application of a porous heterojunction vanadium-based aqueous zinc battery positive electrode, firstly, FeCI3. 6H2O and fumaric acid are dissolved in deionized water respectively and stirred vigorously, suspension liquid is transferred into a round-bottom flask for oil bath, and washing and drying are performed after cooling to obtain a product MIL-88A; dissolving NH4VO3 in deionized water, and stirring in an oil bath until NH4VO3 is completely dissolved; the preparation method comprises the following steps: dispersing MIL-88A in ethanol, dropwise adding into an NH4VO3 solution, and stirring; after cooling to room temperature, centrifuging a solid product with water and ethanol respectively, finally performing vacuum drying, and heating by using a muffle furnace to obtain FeVO porous heterojunction oxide; the positive electrode material can reduce the diffusion barrier of zinc ions, improve the electron transport generated by a built-in electric field formed at an interface, and significantly improve the rate capability, and the porous structure formed by triggering can reduce the diffusion barrier and improve the stability of the positive electrode structure of the aqueous zinc battery.

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 invention discloses a production and preparation process of chromatographic-grade tetrahydrofuran, and belongs to the technical field of chromatographic reagent preparation, and the production and preparation process comprises the following steps: S1, adding 1, 4-butanediol and a catalyst into a round-bottom flask, installing a short fractionating column, magnetically stirring, heating in an oil bath, and steaming out a crude product while reacting; s2, fully washing the crude product with a sodium chloride aqueous solution, and separating out an organic layer liquid; and S3, introducing the organic layer liquid into an adsorbent column filled with an adsorbent, and carrying out adsorption treatment to obtain the chromatographic-grade tetrahydrofuran. Compared with the prior art, the method disclosed by the invention is improved to a great extent, the catalyst and the adsorbent prepared by a special process are applied to preparation and purification of tetrahydrofuran, the yield, the purity and the light transmittance of tetrahydrofuran are effectively improved, and high-quality chromatographic-grade tetrahydrofuran is obtained. Besides, the invention provides a thought for producing and preparing chromatographic-grade tetrahydrofuran, and the provided catalyst and adsorbent can be used in multiple fields and have good added value.

The invention discloses an extraction device and an extraction method of star anise essential oil, and belongs to the technical field of vegetable oil extraction. The extraction device provided by the invention comprises a round-bottom flask, an air condensation pipe, a distillation head, a condensation pipe, a receiving pipe and a receiving bottle, the opening of the round-bottom flask is connected with the bottom of the air condensation pipe; the top of the air condensation pipe is connected with a bottom end pipe of the distillation head; a side end pipe of the distillation head is connected with the top of the condensation pipe; the bottom of the condensation pipe is connected with the top of the receiving pipe; inserting the tail part of the receiving tube into a receiving bottle; and a polymeric membrane is loaded at the top of the air condensation pipe. According to the extraction device and the extraction method of the star anise essential oil, the problems of long time consumption, large steam consumption and high energy consumption in a traditional extraction process are solved, and meanwhile, the extraction rate of the star anise oil and the extraction rate of the effective component anethole are greatly improved.

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 discloses a negative pressure method solvent-free microwave-assisted extraction process of ledum palustre volatile oil, which comprises the following steps: cutting branches of ledum palustre into sections, and removing impurities; soaking the ledum palustre branch sections in water for pretreatment; putting the pretreated ledum palustre branch sections into a round-bottom flask, and transferring the round-bottom flask into a microwave device; vacuumizing treatment is carried out, after certain negative pressure is achieved, the microwave power and the heating time are adjusted, and essential oil extraction is carried out; after extraction is completed, volatile oil components are collected, petroleum ether is added for cleaning, the washed petroleum ether is combined, the concentrated petroleum ether is combined with collected oily substances, and the ledum palustre essential oil is obtained. According to the method, the boiling point of the system is reduced under the negative pressure condition, heat-sensitive components in the volatile oil are effectively protected, cell walls are damaged by microwaves for extraction, and the dissolution rate of the volatile oil in ledum palustre cells is increased by controlling the microwave power and the extraction time, so that the ledum palustre volatile oil with more chemical components is obtained; the ledum palustre volatile oil is simply and efficiently extracted.

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 utility model discloses novel cinnamomum longepaniculatum absolute oil extraction equipment, which is applied to the technical field of absolute oil extraction and comprises an electric jacket, a round-bottom flask is fixedly mounted in the electric jacket, an extraction container is mounted at the top of the round-bottom flask, and a condensation container is mounted at the top of the extraction container. A snakelike cooling coil pipe is fixedly connected inside the condensing container; connecting flanges are fixedly connected between the round-bottom flask and the extracting container and between the extracting container and the condensing container; an organic solvent in a round-bottom flask is continuously heated to boil and evaporate, and then condensed into the round-bottom flask to extract cinnamomum longepaniculatum leaf powder, and then the cinnamomum longepaniculatum leaf powder is repeatedly extracted through continuous evaporation, condensation and reflux, so that an absolute oil component in cinnamomum longepaniculatum leaves is reserved in the round-bottom flask, and the extraction efficiency and the oil extraction rate of absolute oil are improved. Meanwhile, the oil smell of the purified oil is fuller, and the oxidation resistance is improved.

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 utility model relates to the technical field of oil test container cleaning, in particular to a cleaning device for a round-bottom flask. Comprising a screw rod with a grip arranged at the top; the threaded pipe is sleeved on the screw rod and is in threaded connection with the screw rod; the pushing block is fixedly arranged at the bottom end of the threaded pipe; the upper circular ring is connected to the screw rod in a sleeving manner and is arranged below the pushing block; the upper circular plate is fixedly arranged on the inner side of the lower circular ring and can slide up and down along the screw rod; the lower circular ring is fixedly connected with the bottom end of the screw rod through a plurality of connecting rods; the lower circular plate is fixedly arranged on the inner side of the lower circular ring; one end of the spring is fixed on the lower circular plate, and the other end of the spring is fixed on the upper circular plate; the plurality of elastic strips are uniformly distributed on the circumference; one end is fixed on the upper circular ring, and the other end is fixed on the lower circular ring. The cleaning device solves the problem that the side wall of the spherical bottom of the round-bottom flask is difficult to clean in the prior art, and the cleaning efficiency is improved.

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.