348 results about "Rotary evaporator" patented technology

The invention belongs to the technical field of polymer heat conduction, and particularly relates to a preparation method of a high-heat-conductivity polymer with modified boron nitride as filler, which comprises the following steps: (1) dissolving boron nitride nanosheets into tetrahydrofuran, ultrasonically dispersing uniformly, adding a modifier for reaction, then removing tetrahydrofuran by using a rotary evaporator, transferring into deionized water, and drying to obtain a boron nitride nano-sheet; drying to obtain a modified boron nitride nanosheet; (2) dispersing carbon nanotubes in deionized water, stirring and carrying out ultrasonic treatment, adding the modified boron nitride nanosheets, and then carrying out freeze orientation treatment and freeze drying treatment to obtain a porous foamed composite heat-conducting filler; and (3) carrying out melt blending on the composite heat-conducting filler and polyethylene glycol terephthalate, and carrying out hot press molding to finally prepare the modified high-heat-conductivity polymer. According to the invention, the composite heat-conducting filler improves the interfacial compatibility and dispersity with a polymer matrix, and reduces the interfacial thermal resistance of the composite material, so that the modified polymer has good application in the aspect of heat dissipation of electronic equipment.

The invention discloses an intelligent automatic control rotary evaporator, and belongs to the technical field of chemical instruments. An intelligent automatic control rotary evaporator comprises a bottom box and a heating pot, a rotary machine head is installed on the bottom box, a condenser and an evaporation bottle are installed on the rotary machine head, and the lower end of the condenser is connected with a collection bottle; precise adjustment of the height and the inclination angle of the evaporation bottle is achieved through the electric telescopic rod and the rotating shaft, and the assembly and disassembly process of components is simplified through the bottle retreating locking nut, the condensation installation nut and other structures; heating temperature control automation is realized by combining a temperature sensor and a control box, and constant-speed rotation of the evaporating flask is ensured through motor driving; the stability of the condenser is enhanced by means of a first adjusting rod and a fixing sleeve, and material adding in a vacuum environment is achieved by integrating a deflation charging valve and a vacuum extraction opening; the control box integrates a multi-module control function, supports the replacement of parts of different specifications, remarkably improves the adjustment convenience, operation efficiency, temperature control precision and experiment adaptability of equipment, and is high in automation degree.

The invention discloses a method for co-producing benzoic acid and chromic hydroxide from methylbenzene and chromium-containing waste liquid. The method comprises the following steps: sequentially adding methylbenzene, a catalyst aqueous solution and an organic solvent into a reaction kettle; adding chromium-containing waste liquid to adjust the pH value of a reaction system in the reaction kettle; setting reaction temperature and reaction pressure, keeping the temperature for a certain time, and reacting; adding alkali liquor into the reaction liquid, adjusting the pH to be alkaline, filtering to obtain chromium hydroxide precipitate, and calcining chromium hydroxide to produce chromium oxide green; and adding an extracting agent into the filtrate, extracting and separating to obtain an organic phase, removing the organic solvent by using a rotary evaporator, and carrying out silica gel column chromatography to obtain benzoic acid. The characteristic that the chromium-containing waste liquid is acidic is utilized, the chromium-containing waste liquid is recycled, and the preparation method can improve the yield of chromium oxide green, reduce the usage amount of sulfuric acid and reduce the discharge of the chromium-containing waste liquid, and has important economic and environment-friendly significance.

The utility model discloses a vertical rotary evaporator which comprises a rotary evaporator body, a water bath furnace used for containing liquid for heating a rotary bottle is arranged above the rotary evaporator body, and a liquid storage tank used for storing the heated liquid for standby application is arranged above the rotary evaporator body. A floating assembly used for alternately and automatically opening and closing a liquid inlet wheel and a liquid outlet wheel formed in one side of the water bath furnace is arranged in the water bath furnace. According to the water bath furnace, the floating block drives the baffle to float in liquid in the water bath furnace, when the liquid in the water bath furnace is in a right state, the baffle ascends to block the liquid inlet of the water bath furnace, the liquid outlet is opened, and part of the liquid is conveyed into the liquid storage tank through the liquid outlet pipe; when the water bath furnace works, the baffle descends to block the liquid outlet, the liquid inlet is opened, the liquid in the liquid storage tank is conveyed into the water bath furnace through the liquid inlet pipe, and the liquid in the liquid storage tank is heated through the heating rod.

The invention discloses a sea buckthorn fruit water-soluble micromolecule and a component extraction process thereof, and relates to the technical field of natural plant chemistry. The method comprises the following steps: S1, pretreating the sea buckthorn fruits, namely crushing the sea buckthorn fruits, accurately weighing the crushed sea buckthorn fruits, adding ultrapure water according to a ratio of 1g: 10mL, carrying out hot water extraction and centrifugation, and filtering impurities by using a filter membrane; s2, extracting sea buckthorn fruit water-soluble small molecules, adding high-concentration absolute ethyl alcohol into centrifugally filtered supernate, sealing and standing overnight at 4 DEG C, centrifuging an alcohol precipitation sample, filtering, performing vacuum evaporation by using a rotary evaporator to remove ethyl alcohol and water, weighing, re-supplementing ultrapure water, heating in a water bath for dissolving, and filtering to obtain the sea buckthorn fruit water-soluble small molecules. Finally, filtering to obtain a sea buckthorn fruit water-soluble micromolecule extracting solution, and refrigerating and storing at 4 DEG C; according to the method, the water-soluble micromolecular chemical components of the sea buckthorn fruits are extracted by using a water extraction and high-concentration ethanol precipitation technology for the first time; the functional analysis shows that the water-soluble small molecule extract has antibacterial biological activity.

The utility model discloses a system for step-by-step separation and conversion of tar residues, which comprises an ultrasonic cleaning instrument, the liquid outlet end of the ultrasonic cleaning instrument is connected with a solid-liquid separator through a pipeline, the liquid outlet end of an upper liquid layer of the solid-liquid separator is connected with a delivery pump I through a pipeline, and the delivery pump I is connected with the liquid inlet end of a rotary evaporator I through a pipeline. Concentrated organic matters in the rotary evaporator I are conveyed into a vertically arranged chromatographic column through a pipeline, the lower end of the chromatographic column is connected with a sand core funnel, a collecting tank is placed below an outlet of the sand core funnel, the collecting tank is connected with a conveying pump V through a pipeline, and the conveying pump V is connected with a liquid inlet end of the rotary evaporator II through a pipeline. According to the method, high additional organic matters in the tar residues can be effectively extracted by adopting a mode of synergism of ultrasonic-assisted extraction and column chromatography separation, so that resource utilization of the tar residues is realized. The solvent and the eluent selected in the whole process can be recycled through a rotary evaporator, the operation cost is low, and near-zero emission can be realized.

The invention provides a red fluorescent carbon nanodot as well as a preparation method and application thereof. The preparation method of the red fluorescent carbon nanodot provided by the invention comprises the following steps: weighing 0.1-2.8 g of 1, 8-diaminonaphthalene solid, dissolving the 1, 8-diaminonaphthalene solid in 20mL of phosphoric acid, and magnetically stirring to dissolve the 1, 8-diaminonaphthalene solid; transferring the solution into a hydrothermal kettle, carrying out hydrothermal reaction for 6-26 hours under the condition of 120-300 DEG C, and cooling the reaction kettle to room temperature in a natural environment after heating is finished; purifying by using a column chromatography, and taking absolute ethyl alcohol as a washing solvent to obtain a pure carbon dot solution; and finally, evaporating the ethanol solvent by adopting a rotary evaporator, and drying to obtain pure carbon nanodot solid powder. The carbon dot solution can emit bright red fluorescence under the excitation of xenon lamp light with the wavelength of 380-550 nm. The method has a wide application prospect in the fields of time-resolved imaging, advanced information encryption, anti-counterfeiting and the like.

The utility model discloses a rotary evaporator which comprises a heating base, a water bath kettle is arranged on the heating base, a connecting base is arranged on one side of the heating base, a lifting device is arranged on the connecting base, and the lifting device comprises a fixed seat connected with the connecting base and a lifting platform vertically connected with the fixed seat in a sliding mode. A rotary seat is arranged on the lifting platform, a distillation bottle and a cooling bottle are respectively arranged on two sides of the rotary seat, the distillation bottle rotates around the central axis of the distillation bottle under the driving of the rotary seat, the bottle body of the distillation bottle is positioned in the water bath kettle, and a spiral pipeline is arranged on the distillation bottle along the surface of the bottle body; the distillation bottle is communicated with the cooling bottle through a rotating seat, and a collecting bottle is communicated below the cooling bottle. During rotary evaporation, high-temperature liquid in the water bath kettle enters the pipeline and flows along the bottle body, even if the bottle body of the distillation bottle rotates, the bottle body exposed out of the liquid level is continuously heated by the high-temperature liquid in the pipeline above the liquid level, and the evaporation efficiency is improved.

The invention belongs to the technical field of coal washing flotation reagents, and discloses a synthesis process of an environment-friendly coal washing flotation reagent foaming agent, and the synthesis process comprises the following steps: composite reaction; water phase fusion; according to the method, biodegradable alcohols such as pentanol and sec-octanol are adopted as main raw materials, and poloxamer and glycerol are matched, so that the problem of toxic residue of a traditional hydrocarbon foaming agent is avoided. In the synthesis process, low-boiling-point impurities are removed through molecular sieve filtration and a rotary evaporator, it is ensured that the purity of the raw materials is larger than or equal to 99.5%, the proportion of the final product deionized water reaches 40-50%, the use amount of an organic solvent is greatly reduced, nanoscale wrapping of alcohol molecules by an emulsifier OP-10 is achieved through a gradient water adding method and an ultrasonic-assisted emulsification technology, and the content of the alcohol molecules is reduced. And a microemulsion structure with high interfacial film strength is formed. After lauryl sodium sulfate is added as an auxiliary emulsifier, the strength of an oil-water interfacial film is improved by 30% or above, and the half-life period of foam is prolonged to 1.8 times of that of a traditional process.

The present invention provides an activated alumina and a preparation method and application thereof. The preparation method of activated alumina comprises the following steps: (1) mixing aluminum hydroxide mixed powder and pseudo-boehmite, placing the mixture in a ball-forming disk, balling the mixture by a rotating disk ball-forming method, spraying a binder during the ball-forming process, and preparing activated alumina balls with a diameter of 1-3 mm; (2) pressurizing the activated alumina balls to obtain pressurized activated alumina microspheres; (3) hydrating and steam curing the pressurized activated alumina balls; (4) gradient calcining the steam-cured activated alumina balls, soaking the calcined activated alumina balls in water for 60-65 hours, and then rotary evaporating the calcined activated alumina balls in a rotary evaporator at 85-90° C. and a rotation speed of 130-140 r / min to obtain activated alumina. The activated alumina balls prepared by the present invention have high specific surface area and pore volume, high strength, low wear rate, and good high temperature resistance.

The utility model discloses a novel rotary evaporator, which relates to the technical field of experimental equipment and comprises a base and a receiving bottle. A heating pot is fixedly connected to one side of the upper end of the base, a rotary evaporator body is fixedly connected to the middle of the upper end of the base, a rotating rod is rotatably connected to one side of the rotary evaporator body, and a first constraint structure is fixedly connected to the side, close to the heating pot, of the rotating rod and comprises a connecting block structure; a plurality of limiting structures are fixedly connected to the middle of the connecting block structure, a distillation flask is in threaded connection with an inner cavity of the rotating rod, and a condenser is fixedly connected to the side, away from the first constraint structure, of the rotating rod. According to the utility model, through the cooperation of the connecting block structure and the limiting structure, the positions of the clamping block structures can be limited, and then through the cooperation of the plurality of clamping block structures, the joints of distillation flasks with different sizes and the rotating rod can be restrained, so that the flexibility and universality of the device can be improved.

The invention relates to the technical field of nanometer detection, in particular to a preparation method and application of nitrogen-sulfur-doped fluorescent carbon dots for detecting arsenic elements. Comprising the following steps: dissolving thiourea and o-phenylenediamine in formamide, transferring the solution into a polytetrafluoroethylene reaction kettle for reaction, cooling the product to room temperature, centrifuging, collecting supernate, filtering by using an organic filter membrane, dialyzing by using a dialysis bag, filtering by using a water-phase filter membrane, putting into a rotary evaporator for rotary evaporation concentration, and freeze-drying the product to obtain the o-phenylenediamine. The nitrogen and sulfur doped fluorescent carbon dot powder capable of being used for detecting the arsenic element is obtained; the fluorescent carbon dots are simple to synthesize, quick in response and high in sensitivity, arsenic can be qualitatively and quantitatively detected without chemically modifying the detection probe, and the fluorescent carbon dots have a good application prospect.

The invention provides a tire pyrolysis oil fractionation method, and relates to the technical field of chemical separation. Tire pyrolysis oil needs to be modified and upgraded due to the defects of high sulfur content, large viscosity and the like, and an existing modification method has the problems of harsh reaction conditions, high cost and the like. The method comprises the following steps: diluting the tire pyrolysis oil, putting the diluted tire pyrolysis oil into a feeding device, adjusting system pressure and molecular distillation equipment parameters for separation, recovering part of escapes through secondary condensation and cold trap condensation, and evaporating out a diluent by using a rotary evaporator to obtain light and heavy distillate oil. According to the method, efficient separation and nondestructive collection can be achieved, the modification effect and economic value of the pyrolysis oil are improved, and waste tire treatment modes are increased.

The utility model discloses a fixing device for a rotary evaporator, which belongs to the technical field of rotary evaporators and comprises a base, a heating box is arranged at one end above the base, a lifting component is arranged at one end in the middle above the base, a connector is arranged at one end of the lifting component, and a convenient fixing component is arranged at one end of the connector. One end of the convenient fixing assembly is provided with a flask, the other end of the connector is provided with a condenser, a collecting bottle is arranged below the condenser, and a supporting assembly is arranged below the collecting bottle. By arranging the convenient fixing assembly, the flask can be conveniently installed and fixed, the convenience is high, when the structure is used, the flask can be conveniently installed and fixed, and the practicability is high. The flask can be fixed by directly rotating the rotating handle, the fixing and clamping effects on the flask are good through the cooperation of the fastening spring and the fastening pad during fixing, and the collecting bottle is convenient to disassemble and assemble through the arrangement of the supporting assembly.

A process for producing composite electrode particles coated with a granular silicon structure, a carbon layer, and zinc oxide, comprising the following steps: introducing several first silicon particles, a macromolecular material, bitumen, and an alcohol solution into a grinding mill for mixing to cause some of the first silicon particles to form several composite silicon particles; then introducing several porous carbon particles into the grinding mill for mixing to form a first mixture; then introducing the first mixture into a rotary evaporator to obtain several mixed powders; then introducing the mixed powders into a sintering furnace to perform atmospheric sintering to obtain several first composite particles coated with the carbon layer that incorporates the first silicon particles and the composite silicon particles;and then the introduction of several zinc oxide particles and the first composite particles into a roller mixer for mixing in order to obtain the composite electrode particles.

The invention discloses a preparation method of safflower seed meal polysaccharide, which is characterized by comprising the following steps: mixing safflower seed meal powder with distilled water; boiling the mixture, continuously stirring, extracting the precipitate, adding distilled water again, and repeating the operation; filtering the mixture with filter paper, and collecting filtrate; adding 95% ethanol, and standing for 24 hours to precipitate the polysaccharide at 4 DEG C; separating to obtain an upper-layer supernatant and a lower-layer precipitate; drying the precipitate by using a rotary evaporator until a concentrated solution is obtained, and removing protein by using a Sevag method; removing pigments in the concentrated solution by using AB-8 macroporous column chromatography to obtain a crude polysaccharide sample;

In accordance with one or more embodiments of the present disclosure, a rotary evaporator is disclosed. The rotary evaporator may include a base, an evaporation vessel, a rotary union, a motor for rotating the evaporation vessel, a heat jacket, a purge tube and a purge system. The evaporation vessel includes a mounting end that is coupled to the rotary union and an opposite end, with an opening defined in the opposite end and a reservoir in communication with the opening for receiving a sample through the opening. The heat jacket heats or cools the sample when contained in the evaporation vessel, and the purge system controllably supplies fluid to the evaporation vessel via the purge tube.

The utility model provides a rotary evaporator, and belongs to the field of experimental instruments. The rotary evaporator comprises a platform, a heating device, a rotating shaft, a tray, a gravity sensor and a display terminal, the tray is positioned in the heating device; one end of the rotating shaft is connected with the motor, and the other end of the rotating shaft is connected with a tray in the heating device; the gravity sensor is fixed in the middle of the rotating shaft and located between the platform and the heating device; the display terminal is electrically connected with the gravity sensor. The gravity sensor is arranged in the middle of the rotating shaft, and the gravity sensor detects the gravity signal and provides the gravity signal to the display terminal, so that the display terminal displays the evaporation progress based on the gravity signal, and energy waste caused by continuous evaporation when evaporation is completed is avoided. And the rotation speed and the heating temperature can be regulated and controlled in the evaporation process based on the evaporation progress provided by the display terminal, so that the evaporation efficiency is improved.

The utility model provides a low-temperature concentrator, and aims to solve the technical problems that in the process of synthesizing fondaparinux sodium, a traditional rotary evaporator is adopted for concentration and separation, time consumption is long, and products have degradation risks. The concentration barrel is sequentially divided into a middle barrel body and an upper barrel body from bottom to top, and the inner spaces of the middle barrel body and the upper barrel body are mutually communicated. And the middle cylinder is provided with a heating unit. And a vacuum pipeline is arranged at the top of the upper cylinder body. The rotating unit is provided with a rotating table, the rotating table is arranged in the middle barrel, and a containing groove is formed in the rotating table from top to bottom. The turntable is connected with a motor. The liquid injection unit is matched with the rotary table and comprises a liquid pipeline and a liquid injection head. One end of the liquid pipeline penetrates through the side wall of the middle cylinder and then extends to the upper part of the rotary table. The liquid injection head is movably installed at one end of the liquid pipeline. A liquid injection hole set matched with the containing groove is formed in the bottom end of the liquid injection head and used for liquid injection of the containing groove. And through the matching effect between the rotary table and the liquid injection head provided with the liquid injection hole group, the liquid material is distributed into a liquid film in the accommodating groove, and the evaporation area is favorably increased.

The invention relates to the technical field of natural plant extraction, in particular to a thuja sutchuenensis traditional Chinese medicine extract extraction method which comprises the following steps: S1, raw material treatment: selecting fresh and dry thuja sutchuenensis branches and leaves, cleaning and airing, and crushing thuja sutchuenensis materials to 60-80 meshes; s2, extracting the traditional Chinese medicine thuja sutchuenensis: step 1, extracting a solvent: a, extracting the solvent by using ethanol with the volume fraction of 70%-90% as the extracting solvent; b, an extraction process: mixing the powder and ethanol according to a solid-to-liquid ratio of 1: 8 and thuja sutchuenensis powder to an ethanol solution, placing the mixture in a water bath at 60 DEG C for reflux extraction for 2 hours, standing and cooling, filtering out supernate and reserving residues, repeatedly extracting twice, and merging extracting solutions for later use; step 2, concentrating: concentrating the extracting solution through a rotary evaporator, and controlling the water bath temperature not to exceed 50 DEG C; solvent optimization: multi-stage solvent proportion combination is used, various target components can be effectively extracted, solvent waste is reduced, and the extraction efficiency is improved.

A rotary evaporation device capable of adjusting the vacuum degree comprises a rotary evaporator, a condensation system and a vacuum system. The vacuum system comprises a diaphragm pump capable of adjusting the vacuum degree, an air inlet pipe of the diaphragm pump is connected with a first condensation pipe in the rotary evaporator, an exhaust pipe of the diaphragm pump is connected with an outer pipe inlet of a second condensation pipe, a condensing agent of the condensation system is introduced into an S-shaped inner pipe of the second condensation pipe, and the lower end of the second condensation pipe is communicated with a second collection bottle; the condensing system comprises a condensing agent inlet pipe, a condensing agent outlet pipe and a condensing agent return pipe, the condensing agent inlet pipe is connected with the cold pump and an inlet of the snakelike inner pipe of the first condensing pipe, and the condensing agent outlet pipe is connected with an outlet of the snakelike inner pipe of the first condensing pipe and an inlet of the snakelike inner pipe of the second condensing pipe; and the condensing agent return pipe is used for connecting an outlet of the S-shaped inner pipe of the second condensing pipe and an aspirator in the cold system. According to the device, the proper vacuum degree can be adjusted according to different solvents, and the solvents can be more sufficiently collected.

The utility model relates to rotary evaporator bottle technical field, concretely relates to a kind of anti-overflow stirring assembly for rotary evaporator bottle, the anti-overflow stirring assembly for rotary evaporator bottle includes stirring rod and at least one stirring vane, the stirring rod is inserted into the rod body inside rotary evaporator and is provided with at least one described stirring vane, multiple stirring holes are uniformly opened on the stirring vane. When the rotary evaporator starts to rotate in actual application, the stirring rod in the bottle rotates with the rotary evaporator, and at the same time, the blade surface of the stirring vane on the stirring rod continuously shears the liquid in the bottle, thereby playing a stirring role, making the liquid in the bottle evenly heated, to prevent violent boiling. Further based on multiple stirring holes opened on the stirring vane, while stirring liquid, liquid can also be turned upside down based on stirring hole, thereby further improving stirring efficiency, making the liquid in the bottle more evenly heated, effectively preventing liquid from violent boiling.

The invention discloses an application of a coix seed extract in preparation of a medicine for preventing and treating acute lung injury. The semen coicis extract is obtained by performing reflux extraction on semen coicis by using ethanol, recovering an extraction solvent by using a rotary evaporator and then performing evaporation concentration by using a water bath. The coix seed extract can obviously increase the thymus index, improve the pathological injury of lung tissues, reduce the level of inflammatory factors in serum and lung tissues, possibly inhibit the expression of NLRP3, Caspase-1 and GSDMD-N in NLRP3 signal channel key proteins in the lung tissues, inhibit the NLRP3 signal channel, inhibit inflammation and pyroptosis, and play a role in protecting ALI. The coix seed extract can inhibit the activation of an NLRP3 signal channel and play a role in treating the acute lung injury disease.

The utility model relates to the technical field of experimental instruments, and particularly discloses a rotary evaporator. Comprising an evaporation assembly and a water bath; the top of the water bath kettle is provided with an opening and a matched kettle cover; the pot cover is provided with a partial opening. The opening is communicated with the interior of the water bath kettle; the water bath kettle comprises an inner container and a shell; the inner container is arranged in the shell; the pot cover is matched with the mounting groove to cover the inner container, and the pot cover rotates in the mounting groove to adjust the orientation of the opening. A cleaning mechanism is further arranged on one side of the water bath kettle; the cleaning mechanism comprises a cleaning cylinder and a nozzle; the nozzle is communicated with the pressure tank; the pressure tank communicates with the water supply unit; a cleaning opening capable of being opened and closed is formed in a rotary bottle of the evaporation assembly; and the nozzle enters or exits from the pressure tank through the cleaning air cylinder from the cleaning port for cleaning operation. The cleaning mechanism disclosed by the utility model can select proper cleaning strength to carry out targeted cleaning according to different types and degrees of attached pollutants in the rotary bottle.

The invention discloses a method for preparing a vinyl sulfide compound under a ball milling condition, and relates to the technical field of vinyl sulfide compound preparation, and the method comprises the following steps: selecting aryl sulfonium onium salt as an initial raw material, potassium tert-butoxide as alkali and tetrahydrofuran as a liquid auxiliary grinding agent; adding the raw materials into a grinding tank of a ball mill according to a certain proportion, and grinding by a grinding ball; neutralizing the ground raw materials by using a saturated sodium chloride aqueous solution, and extracting the solution; combining organic phases, adding anhydrous sodium sulfate, drying, carrying out rotary evaporation on a rotary evaporator to remove a solvent, and separating and purifying a crude product by a silica gel column to obtain a vinyl sulfide compound; the stainless steel ball-milling tank is used for replacing a traditional glass reaction container, mechanical stress and shearing force generated by left-right vibration of stainless steel grinding balls in the ball-milling tank are used as energy sources of organic chemical reaction, and the problem of environmental pollution caused by use of a large amount of organic solvent is avoided.

The utility model discloses a high-sealing rotary evaporator, and relates to the technical field of evaporators. The device comprises a base, one end of the base is fixedly connected with a water bath heater, one end of the base is provided with a three-way pipe, the top of the three-way pipe is fixedly connected with a condensation pipe, the bottom of the three-way pipe is fixedly connected with a collecting pipe, the input end of the three-way pipe is fixedly connected with a connecting pipe, and the top of the connecting pipe is fixedly connected with a vacuum pump; the input end of the connecting pipe is rotationally connected with an air guide pipe. When the locking threaded ring is pulled to be arranged at the input end of the air guide pipe in a sleeving mode, the locking threaded sleeve is screwed to be in threaded connection with the locking threaded ring, one end of the T-shaped sealing ring is pushed to be inserted into the first rubber sealing ring, and therefore the first rubber sealing ring is extruded to deform and fills a gap between the locking threaded ring and the air guide pipe; therefore, the connection stability and sealing performance between the evaporation beaker and the gas guide pipe are effectively improved, and the evaporation efficiency of the device and the accuracy of experimental results are improved.

The invention discloses a preparation method of soft magnetic composite material powder. The preparation method comprises the following steps: (1) preparing coating liquid; (2) pretreatment: carrying out oil removal, degreasing and hydroxylation treatment on the metal magnetic material powder; (3) coating: filling the metal soft magnetic powder into a rotary evaporator and injecting coating liquid; (4) aging and drying; (5) calcining at low temperature, namely preserving heat at 150-700 DEG C for 0.1-50 hours, wherein the heat can be preserved in stages; the heat preservation atmosphere is N2 / H2 mixed gas, the hydrogen proportion is smaller than or equal to 80 vol%, and the oxygen partial pressure is smaller than or equal to 10 <-3 > Pa; and (6) powder mixing: adding a lubricant, a forming agent or a secondary coating agent into the metal soft magnetic powder coated with Al2O3. The forming agent or the secondary coating agent is silicon resin or epoxy resin, and the lubricant is stearic acid or / and stearate or wax; (7) die forming; (8) heat treatment; (9) impregnation; and 10, curing. Compared with the prior art, the preparation method is simple, good in magnetic performance, safe and environmentally friendly.

Glass vessel (11, 11'), in particular evaporation flask, for a laboratory device (30), in particular a rotary evaporator, with a vessel body (12) made of glass, which defines a receiving space (17) for a medium to be heated, in particular a liquid, characterized by at least one heating resistance element (20) which is in thermally conductive contact with the vessel body (12) and has a connection (23) for supplying electrical energy, wherein the connection (23) comprises at least two sliding contact surfaces (25) which surround a neck (15) of the flask-shaped glass vessel (12).

The invention relates to the technical field of sanitary pest control, and discloses a mosquito-repelling, itching-relieving and swelling-eliminating composition and a preparation method thereof.The mosquito-repelling, itching-relieving and swelling-eliminating composition comprises clerodendrum sativum hydrolat and tithonia diversifolia hydrolat, the clerodendrum sativum hydrolat is obtained through extraction with an ultrasonic and steam distillation combined method, and the tithonia diversifolia hydrolat is obtained through a rotary evaporator. Extracting under reduced pressure; the mosquito-repellent liquid is scientific and reasonable in formula, safe, efficient, low in price and simple in preparation process, and has triple effects of repelling mosquitoes, relieving itching and diminishing swelling.

The invention belongs to the technical field of food processing, and relates to a method for enriching unsaturated fatty acid in tussah chrysalis oil through an ultrasonic-assisted beta-cyclodextrin inclusion method. Preparing fresh tussah pupa into tussah pupa powder; performing supercritical CO2 extraction; the method comprises the following steps: weighing tussah chrysalis oil, respectively carrying out saponification reaction on the tussah chrysalis oil and a saponification medium, adjusting pH by hydrochloric acid, and drying to remove other impurities to obtain tussah chrysalis oil mixed fatty Adding the tussah chrysalis oil into a beta-cyclodextrin solution, carrying out ultrasonic treatment on the mixed solution, freezing, unfreezing at room temperature, carrying out reduced-pressure suction filtration to obtain a white solid, washing, centrifuging, combining supernate, and drying the solid part to constant weight to obtain white powder, namely a beta-cyclodextrin-tussah chrysalis oil compound; and adding petroleum ether, stirring, carrying out reduced pressure suction filtration, and recovering the petroleum ether by using a rotary evaporator to obtain the residual liquid, namely the tussah chrysalis oil unsaturated fatty acid extract.