54 results about "Round-bottom flask" patented technology

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 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 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 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.

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.

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 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.

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 invention discloses a cleaning device for improving the surface modification treatment quality of metal powder and a using method thereof.The device comprises a bottle burning plug, a cleaning rod body, a cleaning block and a side edge cleaning assembly, one end of the cleaning rod body penetrates through the bottle burning plug to be connected, and the other end of the cleaning rod body is connected with the cleaning block; a fixing strip is arranged on the side wall of the cleaning rod body and connected with the side edge cleaning assembly. The cleaning device suitable for cleaning the single-mouth / multi-mouth round-bottom flasks is simple in design structure and free of a mechanical transmission device, and the manufacturing cost can be greatly reduced. The device can achieve automatic and efficient cleaning without manual operation, when the device is used, only the upper portion of the cleaning rod body needs to be connected with the rotating speed regulator, the cleaning rod body can drive the cleaning brush and the cleaning block to continuously sweep while rotating, and therefore all-directional cleaning of the round-bottom flask is achieved. The device further has the advantages of being high in adjustability, good in adaptability and the like, and different types of cleaning requirements can be met.

The present application relates to the field of nanobiotechnology, and particularly relates to a silver nanocomposite for rapid detection of uric acid, and the preparation steps include: (1) adding diatomite and deionized water into a round bottom flask in sequence, stirring to make them completely dispersed, adjusting the pH of the suspension with sodium hydroxide solution, and obtaining diatomite suspension by water bath heating; (2) adding the diatomite suspension and anhydrous ethanol into a polytetrafluoroethylene liner, then adding sodium citrate aqueous solution and AgNO3 aqueous solution in sequence, and stirring to make them uniformly mixed; loading the liner into an autoclave and placing it into an oven, after hydrothermal reaction, cooling to room temperature, centrifugally separating the reaction product, washing and centrifugally separating the sediment, and drying in a vacuum drying box to obtain the silver nanocomposite. The silver nanocomposite prepared by the application is applied to the detection of uric acid, the detection method is simple, convenient for popularization and application, and can be widely applied to the determination of uric acid content in body fluids.

The invention relates to the technical field of biological science, in particular to a synthetic method of hapten with glyphosate and alachlor structural characteristics. Comprising the following steps: dissolving alachlor in absolute ethyl alcohol in a clean and dry round-bottom flask to enable the concentration of alachlor to be 0.6 mol / l, stirring and clarifying, adding glyphosate and sodium hydroxide solids according to a molar ratio of 1: 1: 2, carrying out reflux reaction at 80 DEG C for 4 hours, monitoring by a TLC (Thin Layer Chromatography) method, and after no alachlor raw material is left, carrying out reduced pressure distillation to remove absolute ethyl alcohol to obtain the alachlor. Dissolving the residue in water, adjusting the pH value to 10 by using a 2mol / l sodium hydroxide solution, extracting by using ethyl acetate, supplementing the sodium hydroxide solution in each extraction, keeping the pH value to be more than 10 until the organic phase does not absorb ultraviolet light, adjusting the pH value of the water phase to 3 by using a 2mol / l hydrochloric acid solution, and extracting once by using ethyl acetate; the operation is simple, the post-treatment is easy, and the yield is high.

The invention discloses a preparation method and application of a PVP (polyvinylpyrrolidone) modified Ni-Mo catalyst, and belongs to the field of fuel cells, the PVP modified Ni-Mo catalyst is mainly applied to catalytic degradation of hydrazine hydrate, and the preparation method comprises the following steps: under the condition of 25 DEG C, selecting NiCl2. 6H2O and Na2MoO4. 2H2O as precursor solutions, respectively taking NiCl2. 6H2O, Na2MoO4. 2H2O and PVP according to a certain proportion, putting the NiCl2. 6H2O, the Na2MoO4. 2H2O and the PVP into a 100ml double-neck round-bottom flask, and sequentially mixing uniformly to obtain a precursor solution; then 45 mg of a reducing agent NaBH4 is added, an obtained black suspension is the prepared Ni / MoOx + PVP catalyst, the optimal Ni / Mo ratio of the prepared catalyst is 83: 17, and the optimal addition amount of PVP is 5 mg. The optimum NaOH concentration and temperature of the catalyst for catalytic degradation of hydrazine hydrate are 6M and 343K respectively. The catalyst has the beneficial effects that Mo is a rare earth element, is lower in price compared with noble metal, has excellent alloying property after being combined with Ni, has extremely small particle size and crystallinity, and can enhance the adsorption capacity and catalytic activity to reactants and intermediate reactants, and the addition of PVP can make the catalyst particle distribution more uniform, so that the catalyst has good catalytic activity. The stability and the catalytic performance of the catalyst are improved, and catalytic degradation is facilitated.

The application discloses a preparation process of a GSH ratio fluorescent probe, and specifically comprises the following steps: (1) raw materials 3-[3-(4-fluorophenyl)-1-isopropyl-1H-indole-2-yl]-propenal and dehydroacetic acid are placed in a 25 mL round-bottom flask, anhydrous DMSO is added as a solvent, and the raw materials are completely dissolved; (2) a catalytic amount of piperidine is added dropwise as a catalyst, and the reaction is carried out under N2 protection at 45±2 DEG C for 24 hours; after the reaction is completed, the color of the solution changes from the original blood red to dark red; (3) after cooling, dichloromethane and water are used for extraction, and finally, a dichloromethane / petroleum ether mixture is used as a developing agent to obtain a red crystal, which is used as a probe molecule 1 of the GSH ratio fluorescent probe. The application relates to the technical field of biological medicine, and specifically provides a preparation process of a GSH ratio fluorescent probe.

The application belongs to the technical field of polymer materials, and discloses a method for preparing a polyamide nanofiltration membrane based on a non-reactive ionic liquid, which comprises the following steps: preparation of a substrate PES membrane: 16wt% of polyethersulfone PES, 16wt% of polyethylene glycol PEG, and 68wt% of N-N dimethylformamide DMF are weighed and placed in a round-bottom flask, stirred in a water bath, and left to stand at the same temperature to remove air bubbles, then, the casting solution is cast on a glass plate with a steel knife and immersed in ultrapure water to remove residual solvent; preparation of a polyamide PA membrane: interfacial polymerization is performed on the PES membrane by using an aqueous phase solution containing piperazine PIP and 1-butyl-3-methylimidazole chloride and an oil phase solution containing TMC to synthesize a polyamide active layer. The application provides a new perspective for the regulation of monomer diffusion and reaction in the interfacial polymerization process, and has important application potential in the preparation of high-performance polyamide composite membranes.

The utility model relates to the technical field of pharmaceutical preparation engineering, and disclose a kind of electric doctor blade device based on profiled surface and negative pressure coordination, including the bottom end fixed connection of air pump main body is connected steel pipe, and the output end fixed connection of air pump main body is suction pipe.The utility model places installation block and scraping structure in the inside of medicine bottle by hand gripping rubber sleeve, then moves connection steel pipe and adheres steel bar scraper to the inner wall of medicine bottle, and the bottom end of steel bar scraper adheres to the round bottom of medicine bottle, at this time, rotating medicine bottle, under the action of steel bar scraper, the medicine on the inner wall of medicine bottle is scraped on the surface of steel bar scraper, and after scraping a certain amount, medicine can slowly fall into the inside of collecting groove, this design can make the arc of steel bar scraper more adhere to round bottom flask, enhance the contact area of steel bar scraper and the inner wall of medicine bottle, so that steel bar scraper can scrape most of the medicine in the inner wall of flask in the process of scraping, improve scraping efficiency.

A method and apparatus for detecting aluminum carbide content includes a right-angle tube I connected to a round-bottom flask via a rubber stopper I at its inlet. One end of the rubber tube I is connected to one port of a three-way valve, and the other two ports of the three-way valve are connected to rubber tubes II and III, respectively. The other end of the rubber tube II is connected to the gas inlet of a gas chromatograph. The other end of the rubber tube III is connected to the inlet of the right-angle tube II. The outlet of the right-angle tube II, a thermometer, and the inlet of the right-angle tube III are all embedded in the rubber stopper II and installed at the mouth of a specially designed measuring cylinder. The outlet of the right-angle tube III is connected to the inlet of the right-angle tube IV via a rubber tube IV. The outlet of the right-angle tube IV, along with a glass tube, is embedded in the rubber stopper III and installed at the mouth of a conical flask. By measuring the gas volume and composition sequentially through the three-way valve, the aluminum carbide content in the sample is determined using a function model. This allows for direct observation of changes during the detection process, effectively reducing operational errors and improving the accuracy of the detection results.

The invention discloses an extraction system capable of monitoring the temperature of extract liquor in real time, and belongs to the technical field of chemical experiment equipment. The system solves the problems of large deviation and inaccuracy caused by the fact that an existing Soxhlet extraction device adopts a single-neck round-bottom flask and cannot directly monitor the temperature of extract liquor and only indirect temperature measurement is adopted. According to the technical scheme, a multi-neck round-bottom flask is adopted to replace a single-neck flask, a first neck part of the multi-neck round-bottom flask is connected with an extraction tube, a second neck part is provided with a temperature sensor through a ground port, and a sensing part of the sensor extends into the flask and is immersed in an extraction solution. According to the system, thermal resistance of a bottle wall is avoided through direct contact type temperature measurement, accurate real-time monitoring is realized, and the system is used for accurately controlling heating, stabilizing temperature and improving efficiency and reliability in a chemical extraction experiment.

The invention discloses a method for detecting the purity of stearic acid in distearoyl phosphatidylcholine, and relates to the technical field of detection, and the method comprises the following steps: weighing 40mg of distearoyl phosphatidylcholine, placing in a round-bottom flask, adding a sodium hydroxide methanol solution, adding isooctane, uniformly mixing, standing, and taking the supernatant to obtain a test solution; adding a sodium hydroxide methanol solution into a round-bottom flask, adding isooctane, uniformly mixing, standing, and taking supernatant to obtain a blank solution; analyzing and detecting the test solution and the blank solution by adopting a gas chromatographic method to obtain a chromatogram, and calculating the stearic acid purity of the test solution according to the peak area of the chromatogram; according to the method for detecting the purity of stearic acid in distearoyl phosphatidylcholine, efficient and safe determination of the purity of stearic acid is realized by optimizing methyl esterification reaction conditions, adopting a sodium hydroxide methanol solution for methyl esterification, then adding isooctane, uniformly mixing and standing, and combining chromatographic conditions of gas chromatography.

The utility model belongs to the technical field of round-bottom flasks, and provides a fixing frame suitable for round-bottom flasks of multiple models, which comprises a bottom plate, two non-adjacent side walls of the bottom plate are fixedly connected with supporting plates respectively, the side walls of the supporting plates are provided with transverse plates, the lower ends of the transverse plates are provided with clamping assemblies and limiting assemblies, and the side walls of the supporting plates are provided with locking assemblies; the rotary threaded column drives the first bevel gear through the second bevel gear, the rotary column and the two-way threaded rods at the two ends are driven to rotate, the clamping plates are made to be close to the bottle necks and clamped through the clamping blocks of the fixing assemblies, and the two round-bottom flasks with the bottle necks different in size can be stably clamped at the same time in cooperation with the springs; through the sliding connection design of clamping columns on the side wall of the transverse plate and first sliding grooves in the side wall of the supporting plate, the distance between the transverse plate and the bottom plate can be flexibly adjusted, the fixing requirements of round-bottom flasks with different heights are met, fixing can be completed only by rotating a threaded column, and the preparation time before an experiment is greatly shortened.

The invention relates to the technical field of water treatment, in particular to a membrane adsorption treatment method for chromium-containing wastewater, which comprises the following steps: firstly, taking DMAc (dimethylacetamide) into a round-bottom flask, and adding a proper amount of PSF (polysulfone) and PEG600 (polyethylene glycol 600) to prepare an ultrafiltration membrane; the preparation method comprises the following steps: dissolving dry PEBAX2533 resin in quantitative n-butyl alcohol to prepare a 7wt% PEBAX2533 n-butyl alcohol solution, pouring the 7wt% PEBAX2533 n-butyl alcohol solution on a PSF ultrafiltration membrane, and drying to obtain a PEBAX / PSF composite membrane; soaking the composite membrane in filtered and diluted chromium-containing wastewater, oscillating for a certain time in a water bath at a certain temperature, and analyzing the total chromium content in the wastewater before and after adsorption by adopting ICP (Inductively Coupled Plasma); the thiophene content of the feed liquid is 1000 ppm, and the performance research of pervaporation separation of thiophene is carried out on the membrane before and after the adsorption test at normal temperature. According to the membrane adsorption treatment method for the chromium-containing wastewater, after an adsorption test, the PEBAX pervaporation membrane is successfully loaded with chromium (III), the PEBAX pervaporation membrane loaded with the chromium (III) is used for research on pervaporation separation of thiophene, and the separation capacity of the PEBAX pervaporation membrane loaded with the chromium (III) is remarkably enhanced compared with that of the original PEBAX pervaporation membrane.