196 results about "Büchner funnel" patented technology

The invention discloses environment-friendly modified chlorinated polypropylene (CPP) adhesive and a preparation method thereof. The preparation method comprises the following steps: (1) adding 100 weight parts of chlorinated polypropylene, 15 to 25 weight parts of monomers and 200 to 300 weight parts of solvent to a reactor provided with a stirring device, heating until the temperature is increased to 70 to 90 DEG C; (2) adding 3 to 5 weight parts of initiator after the monomers are completely dissolved, further heating to the reaction temperature of 70 to 90 DEG C; and (3) stop heating after the reaction is finished, precipitating the product by acetone, then, carrying out the suction-filtration by a Buchner funnel, oven-drying, dissolving the product by 200 weight parts of solvent, and adding 5 to 15 weight parts of tackifier to obtain the modified CPP adhesive. By using the environment-friendly solvent method to graft modified CPP and further adding acid anhydride, acrylate and nitrogenous monomers, the monomers can be grafted onto the CPP under the action of the initiator, so the modified CPP adhesive has high adhesion to the surface of thermoplastic polyolefin substrates or metals; and the modified CPP adhesive of the invention has the advantages of simple preparation process, non-toxic application, high cost performance ratio, and stronger adhesion to metals or non-polar polymers.

The invention relates to a preparation method of a dopamine modified sepiolite adsorbent. The method comprises the steps that S1, sepiolite powder is weighed and put in a beaker, a hydrochloric acid solution is added, continuous magnetic stirring is conducted, and the mixture is transferred to a Buchner funnel, repeated washing is conducted through deionized water, suction filtration is conducted, and a gel filter cake is collected; S2, the gel filter cake is transferred into a wide-mouth bottle, the wide-mouth bottle is placed in a drying oven for 12 h, the gel filter cake in the wide-mouth bottle is taken out, and grinding is conducted on the gel filter cake to obtain acid-activated sepiolite; S3, the sepiolite which is activated through acid and dopamine hydrochloride is added in a trihydroxymethyl aminomethane buffer solution, and a magnetic stirring reaction is conducted at the room temperature; S4, the deionized water is used for water washing, centrifugation is conducted for multiple times through a centrifugal machine, drying is conducted in a vacuum drier for 24 h, and the dopamine modified sepiolite adsorbent is obtained. The preparation method of the dopamine modified sepiolite adsorbent has the advantages of being simple in technology, low in cost and high in efficiency.

The invention provides a high-efficiency soil protein extraction method, comprising the following steps: adding soil in a pre-cooling soil protein extraction buffer solution and blending and oscillating the mixture in a 4 DEG C shaking table over night; performing drawing and filtering of the shaken mixture in a buchner funnel using a crude filter paper; processing the drawing and filtering liquid by macroporous resin (D101), filtering the processed liquid through a 0.22 Mum microporous membrane, the filtered liquid being the extracellular protein mother liquid; processing the cells on the filter membrane by cleaning, crushing, centrifugalizing and vacuum drying to obtain the dried powder, namely intracellular soil protein sediment. The extracellular protein mother liquid is processed by centrifuging, separating and vacuum drying to obtain the intracellular soil protein dried powder; degrading the intracellular soil protein dried powder until the degraded intracellular soil protein dried powder is clearly separated on 10% polyacrylamide gel SDS-PAG electrophoresis, the method has high separation efficiency, microbial yield is 37.5%, which is higher than the yield of the traditional method 0.1-1%, simple operation flow, good SDS-PAGE resolution and good mass spectrum identification effect.

The invention provides a method for attaching graphene to foamed metal copper framework through vacuum filtration to control the pore size structure of three-dimensional graphene, which mainly comprises the following processing steps: 1, placing foamed metal copper into a Buchner funnel with spread filter paper, pouring graphene oxide dispersion liquid, and performing vacuum filtration; and 2, coating a polymethyl methacrylate (PMMA) layer on the obtained intermediate compound, reducing with hydriodic acid, immersing in a ammonium persulfate solution to remove the foamed copper framework, then placing in a pipe furnace, introducing argon and hydrogen mixed gas to perform further reduction, and removing the polymethyl methacrylate (PMMA). The process flow is simple and easy to operate, stable in process and low in cost, and can control the pore size and morphological structure of the three-dimensional graphene, thus providing a method for efficiently and stably preparing porous three-dimensional graphene and controlling the pore size thereof; the structural three-dimensional network of the product is continuous and uniform; and the product has favorable adsorbability and electrical conductivity, and has wide application prospects in the aspects of water treatment and electrochemistry.

The utility model discloses a multi-connected sludge specific resistance measurement device comprising an experiment table, the bottom of the experiment table is provided with casters, the interior of the experiment table is fixedly provided with a vacuum pump; a table top of the experiment table is fixed with a three-dimensional plate and a tree-form pipe; the table top of the experiment table is internally embedded with a filter flask as well as a plurality of grooves that are internally embedded with metering cylinders provided with Busher funnels; a raised filter nozzle is arranged above each metering cylinder; the filter nozzles of the metering cylinders are respectively connected on one branch pipe of the tree-form pipe by a rubber pipe and a control valve; a main pipe of the tree-form pipe is connected with the filter flask, a vacuum meter and a rotor flow meter; the vacuum meter and the rotor flow meter are fixed on the three-dimensional plate; and the filter flask is connected with the vacuum pump by a pipe. The multi-connected sludge specific resistance measurement device has the advantages of simultaneous conduction on a plurality of groups of data, integration, convenience in moving, high measurement precision, and automatic control.

The invention relates to a method extracting the double trimethylolpropane from the trimethylolpropane distillation residual. The trimethylolpropane distillation residual is dissolved by the deionized water and is added with the active carbon with micron-sized fruit shell size to absorb, and is filtered through a Buchner funnel to filter the active carbon; the temperature of the filter liquor is reduced to minus 5 DEG C. to 1 DEG C. crystallization, and is filtered through the Buchner funnel to gain the crude product of the double trimethylolpropane and collect the mother liquid. The crude product crystals of the double trimethylolpropane are dissolved through the deionized water and is added with the active carbon with micron-sized fruit shell size to absorb, and is filtered through the Buchner funnel to filter the active carbon; the temperature of the filter liquor is reduced to minus 5 DEG C. to 1 DEG C. crystallization, and the filter liquor is filtered through the Buchner funnel to separate the crystals with the mother liquid which is recycled. The crystals gain the double trimethylolpropane products after dehydration and drying. The weight per centage of the hydroxyl is not less than 96 per cent; the weight per centage of the water is not more than 0.2 per cent; the melting point is 107 DEG C. to 110.5 DEG C.; the weight per centage of the hydroxyl value is 26 per cent to 26.7 per cent; the color number of the product is number 10 to number 15 and 80 per cent to 90 per cent of the trimethylolpropane can be recycled.

The invention discloses a process method for preparing a carbon-black-loaded cobalt zinc ferrite wave-absorbing material. The process method comprises the following steps: (a) preparing 1000ml of 10.2% mixed metal salt solution for future use; (b) pouring 50ml of the prepared metal salt solution in a small beaker, adding conductive carbon black into the metal salt solution in the small beaker in a ratio of 1:1 in parts by weight, performing ultrasonic treatment for at least 1 hour until a suspension solution disperses evenly, and then titrating the dispersed suspension solution by 8% sodium hydroxide until the pH value is greater than 8; (c) transferring all the suspension solution obtained in the step (b) into a hydrothermal reaction kettle, and placing the reaction kettle in a drying oven at 180-220 DEG C for solvothermal reaction for 8-16 hours; (d) cooling after the solvothermal reaction is ended, leaching by a Buchner funnel after cooling, washing by deionized water until the leached solution is neutral, and finally, drying, thus obtaining the finished product. Through the process method, the problem that nano-ferrite prepared by a solvothermal method is likely to cluster during reaction can be overcome, and meanwhile, the wave-absorbing performance of the material is improved.

The invention discloses a method for purifying Eptifibatide, which comprises the following steps of: 1) conducting suction filtration with a Buchner funnel containing diatomite to remove slightly soluble impurities; 2) conducting gradient elution and purification with the fixed phase being alkylsilane bonded silica, the phase A of a mobile phase being trifluoroacetic acid aqueous solution and the phase B thereof being chromatographic grade acetonitrile, wherein the mobile phase includes phase A and phase B; and collecting the peptide solution at a target peak value, and conducting reduced pressure distillation and concentration; and 3) using anion exchange method for converting the trifluoroacetate into acetate, thus obtaining the acetic acid Eptifibatide bulk drug which meets the requirement. In the invention, the method which is applicable to the industrialized purification of Eptifibatide is provided; reversed phase high-performance liquid chromatography is used and combined with the anion exchange method for converting the trifluoroacetate into acetate so as to purify the Eptifibatide; and the purity is high, and the purification yield of the yield reaches more than 70 percent and meets the industrialization requirement.

The invention relates to a preparation method of a polyurethane / cellulose multifunctional shape memory high-molecular material. The preparation method comprises following steps: an ion solvent, absolute ethyl alcohol, and deionized water are mixed, and are subjected to ultrasonic dispersion so as to obtain a clear transparent composite solution; a silane coupling agent is added into the clear transparent composite solution, the pH value is adjusted with acetic acid, and the clear transparent composite solution is stirred for hydrolysis reaction of the silane coupling agent; microcrystalline cellulose is added into an obtained solution, full stirring is carried out, and then a Buchner funnel is adopted for filtering; a filter residue is collected, and is introduced into a freezer dryer forfreeze drying so as to obtain functionalized microcrystalline cellulose; and the functionalized microcrystalline cellulose and rhodamine are added into a mixed solution of polyurethane and N-methyl pyrrolidone for stirring. According to the preparation method, the functionalized microcrystalline cellulose, polyurethane, and rhodamine are subjected to solution casting to prepare the polyurethane / cellulose multifunctional shape memory high-molecular material, a double-component heterozygosis network based on cellulose element is constructed, and the polyurethane / cellulose multifunctional shape memory high-molecular material with high strength, high toughness, temperature responsiveness, and ultraviolet light responsiveness is prepared.

The invention discloses a technology for extracting aluminum and zinc from high-aluminum zinciferous aluminum-zinc residues, and belongs to the technical field of treatment of metallurgical waste residues. The technology comprises the following steps: using aluminiferous zinciferous waste residues as a raw material; firstly performing airflow smashing on the raw material, and screening the raw material on which airflow smashing is performed so as to obtain waste residues; then adding sulphuric acid, acetone and an oxidizing agent into the waste residues so as to enable aluminum and zinc in the waste residues to be oxidized; then putting the oxidized waste residues into a Buchner funnel to perform sucking filtration, and separating the filtered waste residues so as to obtain sucking filtration liquid; dropwise adding a sodium hydroxide solution into the sucking filtration liquid, and after sediment occurs, putting the sediment into a muffle furnace to perform high-temperature calcination so as to obtain aluminum oxide powder and zinc oxide powder; and finally performing electrolysis on the aluminum oxide powder and zinc oxide powder by using carbon blocks as a cathode and an anode so as to obtain pure aluminum and pure zinc. The technology disclosed by the embodiment of the invention proves that through the adoption of the technology, the aluminum and the zinc in the aluminum-zinc residues can be effectively separated, the extraction rate is as high as more than 88%, the cost is low in the separation process, and any environmental pollution is not generated.

The invention relates to a preparation method of highly pure magnesium hydroxide nanocrystal, which comprises the steps of: mixing and evenly stirring NaOH solution and MgCl2.6H2O solution at room temperature, transferring the mixed material into a high-pressure reaction autoclave and heating to temperature of 124 DEG C to 135 DEG C, keeping the pressure at 0.20 Mpa to 0.32Mpa, then preserving the temperature for 3 hours to 5 hours, naturally cooling and aging, rinsing and suction-filtering the aged solid-liquid mixture on a Buchner funnel, drying the products after suction filtration in a drying oven, cooling and grinding the products, adding the obtained magnesium hydroxide nanocrystal to clean water, stirring, conducting ultrasonic processing and standing; and in such synthesis way, the magnesium hydroxide nanocrystal with purity of 99.2 percent to 99.9 percent, a shape of a hexagonal piece and granule size of 50nm to 100nm can be obtained.

The invention discloses a preparation method of CD133 immunomagnetic beads. The preparation method comprises the following steps: preparing magnetic beads; preparing magnetic chitosan microspheres; weighing 10 g of chitosan, and adding the weighed chitosan into 200 ml of a 2% acetic acid solution for overnight soaking to enable dissolution; adding 1 g of Fe2O4 nano magnetic beads into the mixed solution, and performing stirring at the room temperature under the condition of 300 r / min; adding 200 ml of saxoline, and performing stirring at 40 DEG C under the condition of 300 r / min; raising the temperature to 50 DEG C, adding 40 ml of formaldehyde, and performing stirring under the condition of 300 r / min; adding 20 ml of glutaraldehyde with the volume concentration of 50% into the mixed solution, performing stirring at 60 DEG C under the condition of 170 r / min, adjusting the pH to be 10, and performing stirring for 2-6 h; adding 100 ml of petroleum ether into a reaction system after finish of reaction, fully performing stirring, performing suction filtration by use of a Buchner funnel to obtain magnetic chitosan microsphere particles, then fully performing stirring and washing by use of ethyl alcohol, washing with distilled water after removal of ethyl alcohol, and performing vacuum drying at 50 DEG C; performing carboxylation on the magnetic chitosan microspheres; and coupling immunomagnetic beads subjected to carboxylation with an anti-body. The preparation method has the advantages of good stability, high sensitivity and the like.

The invention relates to a plant chlorophyll determination process simplification device. The plant chlorophyll determination process simplification device comprises a mounting support, and a transparent reaction cylinder, a Buchner funnel and a volumetric flask are arranged on the mounting support, wherein the Buchner funnel is positioned at the lower part of the reaction cylinder, and the volumetric flask is arranged corresponding to a liquid outlet of the Buchner funnel; the reaction cylinder comprises a vertical main cylinder body, the upper part of the main cylinder body is connected with an extract solution injector and a solid substance inlet, and a liquid outlet valve and an iron wire mesh filter are arranged at the lower part in the main cylinder body; a crushing cutter is also arranged in the main cylinder body, and is hung on the mounting support; and quantification filter paper which can filter a plant extract solution is arranged in the Buchner funnel. The device combines grinding, extraction and filtration devices into a whole and can realize the streamlined operation of extraction and filtration in the chlorophyll determination process, improve the experimental efficiency, increase the experimental precision, treat a large batch of samples, and has good practical value.

The invention discloses a preparation process of scale jelly, relating to the technical field of processing of fish products. The preparation process comprises the following steps: (1), unfreezing and rehydrating scales; (2), cleaning; (3), pretreating, namely, respectively performing acid treatment, alkali treatment and enzyme treatment on the scales, cleaning the scales with flowing tap water until the pH is 7.0, washing twice with distilled water, draining the wet scales until no water drops, placing the scales in a beaker, adding distilled water in a certain ratio, and sealing with aluminum foil paper to prevent water from evaporating; (4), extracting gelatin, namely, extracting gelatin under the conditions that the temperature is 70-100 DEG C, the time is 0.5-4 hours, the ratio of the wet scales to the distilled water is 1 to (3-8) and the pH of water for extracting the gelatin is 7.0; (5), suction-filtering, namely, performing vacuum suction filtration by a Buchner funnel, and filtering scale residues with nylon filter cloth; and (6), gelling, namely, gelling the scale gelatin in a container at a temperature of -10 to 10 DEG C. The scale jelly is high in yield, and high in calcium content; nutritional ingredients are not damaged; the preparation process is simple, gelatin is convenient to extract, and the cost is low.

The invention discloses a high-homogeneity bracket used for the tissue engineering and a preparation method of the high-homogeneity bracket, belonging to the field of biomedical engineering. The preparation method is a technology comprising the following steps of: enabling a polymer solution or organic solvent to flow through a mould filled with pore-forming agent or a mixture of a polymer and the pore-forming agent under the action of a pressure difference, volatilizing the solvent or removing the pore-forming agent, demoulding and forming. Equipment used in a negative pressure method provided by the invention mainly comprises the four parts, i.e., a forming mould, a Buchner funnel, a rubber stopper and a filter flask. The equipment used in the method is simple and easy to obtain, is easy to implement control and operation, and can be used for preparing columnar and tubular porous brackets of various polymers. Compared with the traditional method, the method provided by the invention has the advantages that the tubular brackets can be directly obtained, the form and the porosity of a hole can be better kept, and the diameters and the wall thicknesses of the porous brackets can be expanded.

A method for extracting pentose through plant hemicellulose hydrolysis comprises the following steps: placing a plant raw material in a reaction container, and adding a maleic acid solution; placing the reaction container (Erlenmeyer flask) in a 100-160 DEG C constant temperature heating magnetic stirrer, starting a magnetic stirring and condensing device, and carrying out a reaction for 2-14 h; and rapidly cooling the Erlenmeyer flask after the hydrolysis reaction ends, and filtering the obtained solution by a Buchner funnel to obtain a filtrate which is plant hemicellulose hydrolysate, and repeatedly washing obtained residues until the residues are neutral. Hemicelluloses in the plant raw material is hydrolyzed by maleic acid to extract pentose, the maleic acid is cheap and easily available and has a good hydrolysis effect on hemicelluloses in various raw materials, the pentose yield under optimum conditions can reach 98% or above, and recycling of all components in the plant raw material is facilitated.

The invention provides a method for preparing a biological flocculant from cornstalks. By the method, energy consumption and cost are lowered, and sewage discharge is reduced. The method includes the following steps: S1, smashing and screening the cornstalks, and drying the cornstalks for standby application; S2, after completion of pretreatment reaction, performing solid-liquid separation by a Buchner funnel to obtain a solid-phase material for later enzymolysis; S3, filtering enzymolysis liquid to obtain filter liquor for preparing the biological flocculant; S4, preparing flocculant fermentation liquid; S5, extracting and drying flocculant active ingredients to obtain a product. The method has the advantages that the water heat pretreatment technology is environment friendly, and economy, greening, cleanness and environment protection are realized; yield of glucose in the process of enzymolysis can be increased through enzymolysis; cost is saved, and energy consumption is reduced.

The invention discloses a method for preparing nano-calcium carbonate by using oyster shells, and belongs to the technical field of preparing nano-calcium carbonate. In the present invention, oyster shells are used as raw materials, washed with salt and calcined to obtain calcium oxide powder, then put into hot water for digestion and reaction to obtain calcium hydroxide precipitate, after drying, put into Buchner funnel, use dry ice to sublimate for carbonization, and finally dry to obtain Nano calcium carbonate. The invention utilizes dry ice sublimation to produce uniform carbon dioxide, increases the solid-gas phase boundary contact area, and then strengthens the carbonization reaction through ultrasonic cavitation, improves the carbon dioxide absorption rate and makes the prepared calcium carbonate powder particle size more uniform, solving the traditional problem Due to the inhomogeneity of the gas phase distribution and the small contact area of ​​the gas-liquid phase boundary in the bubble column carbonization method, the carbonization reaction time is longer, and the CO 2 The problems of low absorption rate, large product particles and wide particle size distribution can be industrialized.

The invention relates to a chemical conditioning method for improving dehydration property of surplus sludge, which is characterized by comprising the following steps: putting surplus sludge in an SBR (sequencing batch reactor), stirring with an electric stirrer, carrying out hydrolytic acidification at room temperature in an two-stage control mode (alkali (pH=10.0) after acid (pH=3.0)) (8 days for each stage), and regulating the pH value with 30% HCl and 20% NaOH solution; taking a sample every two days, and storing the sample in a 4 DEG C environment; measuring sludge resistivity by a Buchner funnel method; measuring the solid content in the filter cake with a halogen quick moisture meter; and analyzing the dehydration property of the sludge regulated by acid and alkali according to the measured resistivity and the solid content of the filter cake. The method provided by the invention can improve the dehydration property of the sludge, and promote the release of abundant organic matters in the sludge; and after the sludge is recycled, the problem of insufficient carbon sources for the sewage plant can be solved, thereby lowering the routine operation cost of the sewage plant.

The invention discloses a device and method for testing a slit / sludge dehydration rate in a multi-physics field condition. A long-neck end of a ceramic Buchner funnel passes through a first rubber stopper to the inside of a first upper tip suction flask; a slit / sludge sample is arranged in a tube part of the ceramic Buchner funnel; a perforated upper electrode plate and a perforated lower electrode plate are arranged on a top layer and a bottom layer of the slit / sludge sample; the device also comprises a loading device for loading the slit / sludge sample; and the first upper tip suction flask is connected with a vacuum pump through a second upper tip suction flask. The invention further discloses a method for testing the slit / sludge dehydration rate in the multi-physics field condition. Coupling of a vacuum pressure field, static and dynamic pressure fields and an electric field can be achieved, combined parameters of the static pressure, the vibration frequency, the vacuum degree, the voltage and the current can be conveniently and quickly optimized employing the dehydration rate as an evaluation indicator, and the soil structure change law in or after the slit / sludge dehydration process can be evaluated by using the resistivity.

The invention provides a novel process for removing metal ions in wet-process phosphoric acid. The process comprises the following steps: 1) adding alkaline partially-hydrolytic polyacrylonitrile fiber to deionized water, stirring, naturally filtering, washing a filter cake till the pH of liquid flowing out from the bottom of a Buchner funnel is 8 and obtaining exchange fiber of polyacrylonitrile ions and wet ions when no liquid flows out from the bottom; and 2) filling space between polypropylene cotton of a fiber filter and a cylindrical shell with the exchange fiber of polyacrylonitrile ions and wet ions, connecting a phosphoric-acid outlet pipe of an electrodialysis device with an inlet pipe of the fiber filter, allowing an outlet pipe of the fiber filter to enter a phosphoric-acid storage tank, pumping wet-process phosphoric acid into the electrodialysis device for circulation through a pump, allowing the wet-process phosphoric acid to pass through the electrodialysis device and operating the fiber filter and the electrodialysis device at the same time. The process has the advantages of simple process flow, low energy consumption, low production cost, little environmental pollution and high purification depth. In addition, the electrodialysis device used in the process is simple and easy to operate, low in energy consumption and low in cost needed.

The invention discloses a preparation method of a magnesium glycinate chelate, which comprises the following steps of: (1) weighing and adding 75-200g glycine and 100-230g deionized water into a four-mouth reaction flask, sufficiently stirring and dissolving, (2) then adding 20-53g magnesium oxide, heating to 70-80 DEG C, stirring for reaction for 2-3h, opening vacuum, stirring at 70-80 DEG C for concentration for 2-3h, (3) after concentration, when lowering the temperature to 45-50 DEG C, adding 90-250g alcohol, stirring to cool to the room temperature, and (4) finally, performing suction filtration with a Buchner funnel, and vacuum drying at 40 DEG C for 2h, and obtaining 170g magnesium glycinate. Compared with the prior art, the preparation method of the magnesium glycinate chelate is simple in synthetic route, a technology is safe and reliable, the reaction time is short, a yield is high, the product quality is good, reaction alcohol can be recycled repeatedly, and no pollutant is generated.

The invention relates to a method for preparing 2-trifluoromethylbenzo oxazole, including the steps of as follows: under the protection of nitrogen gas, using carbon tetrachloride as solvent, adding triphenyl phosphine and triethylamine in the reacting container, blending and lowering the temperature to 0 deg.C under the ice water bathing; then adding in trifluoro acetic acid, blending 10-20 minutes, finally adding in carbon tetrachloride dissolved ortho-aminophenol, where the molar ratio of four reactants triphenyl phosphine, triethylamine, trifluoro acetic acid, and ortho-aminophenol is (3-3.5) : (3-3.5) : 1 : (1-1.2); heating to start acute reaction, immediately removing heat source, continuing returning and reacting 3-5 hours, as the reaction ends, vacuum evaporating the solvent from the reacting solution, then adding the solvent petroleum mixed of petroleum ether and acetate in the bulk ratio of 10 to 1 into a bottle to mix into a, soaking, pump filtering, washing the solid in buchner funnel with the mixed solution; making chromatographic resolution on the obtained liquor, and collecting the 25-28 deg.C / 2mmHg fractions, thus obtaining the products 2-trifluoromethylbenzo oxazole. The material materials of the invention are easy to obtain, the operation is extremely simple, and the synthesis is one-boiler made. The method has high yield, suitable to large-scale production.

The invention provides a suction filtration device. The device comprises a base, a piston barrel, a piston, a spiral spring, a piston top cover, a rubber plug and a buchner funnel. The device is characterized in that the buchner funnel is plugged into a hole of a piston top cover fixedly connected with the piston through the rubber plug covered at the lower end, the spiral spring covers between the upper edge of the piston barrel and the top cover of the piston, the inner diameter of the spiral spring is slightly greater than the outer diameter of the piston and is slightly less than the outer diameter of the piston barrel, the place near the top of the piston is communicated with a conduct with a switch, and the lower end of the piston is open. In the actual application, the solution to be filtered is injected into the buchner funnel, the switch on the conduit is opened, the piston is pressed to a certain position, the switch on the conduit is closed, the pressing of the piston is stopped, the buchner funnel is jacked up by the spiral spring, and the piston barrel internally forms negative pressure, so that the filtering can be accelerated.

The invention relates to a method for preparing composite titanium dioxide powder with titanium-coated light calcium carbonate. The method includes steps of a, dissolving butyl titanate in organic solvents to obtain butyl titanate solution; b, adding light calcium carbonate into the butyl titanate solution and uniformly dispersing the light calcium carbonate to obtain turbid liquid; c, adding deionized water into the turbid liquid in a stirring state at a constant speed, hydrolyzing butyl titanate and then aging the turbid liquid for 10-20 min; d, filling the turbid liquid with nitrogen, adding methyl methacrylate into the turbid liquid under the protection of the nitrogen and stirring the turbid liquid for 5-10 min; e, heating a system until the temperature of the system reaches 70-80 DEG C, adding a small quantity of initiators into the system and treating the surfaces of the system for 40-60 min; f, naturally cooling the system after the surfaces of the system are completely treated, filtering serous fluid by the aid of a Buchner funnel, cleaning filter cake by the aid of deionized water and drying and smashing the filter cake. The method for preparing the composite titanium dioxide powder has the advantages that the pigment performance of titanium dioxide powder products can be improved, and the dispersion stability and the weather fastness of the titanium dioxide powder products in organic solvents can be enhanced.

The invention discloses a method for testing the content of calcium carbonate in paper-making process regenerated tobacco leaves. The method comprises the following steps: extracting water-soluble components in a first part of regenerated tobacco leaves of a regenerated tobacco leaf sample by using hot water, wherein the mass of the first part of the regenerated tobacco leaves is m1 and the water content of the first part of the regenerated tobacco leaves is w; putting filtering paper of which the mass is m0 into a Buchner funnel, filtering the extract in vacuum, drying and cooling the filtering paper and a first part of residues, wherein the mass of the filtering paper and the first part of residues is m2; further extracting the water-soluble components in a second part of regenerated tobacco leaves by using hot water, wherein the mass of the second part of the regenerated tobacco leaves is m1DEG and the water content of the second part of the regenerated tobacco leaves is w; cooling to 20-30 DEG C, adding an acid solution, and oscillating for 20-30 minutes; putting filtering paper of which the mass is m0 DEG into the Buchner funnel, filtering the extract in vacuum, drying and cooling the filtering paper and a second part of residues, wherein the mass of the filtering paper and the second part of residues is m3 DEG; respectively calculating the percentage contents of the first part of the residues and the second part of the residues according to determined calculation equations and the obtained parameters, and finally calculating the percentage content of calcium carbonate based on a dry base. The method is simple and convenient, accurate in detection and good in stability.

The invention provides an electric-conductivity type sludge specific resistance measuring apparatus. The electric-conductivity type sludge specific resistance measuring apparatus is mainly used for detecting a specific resistance of municipal sludge or industrial sludge. The electric-conductivity type sludge specific resistance measuring apparatus consists of a vacuum pump, a buffering bottle, anadjusting valve, a tee joint, a vacuum meter, a Buchner funnel, a movable joint, a flow guiding pipe, an exhaust opening, a measuring pipe, an electric conductivity array probe, a constant-voltage power supply, a resistor, a data acquisition card, a computer, an upper liquid drainage valve, a liquid storage barrel and a lower liquid drainage valve. According to an electric conductivity signal acquired by the electric conductivity array probe arranged on the measuring pipe in a suction filtering process, the apparatus determines a time for reaching the specific filtrate volume by analyzing a peak position in the signal, and has an automatic data recording function, so that the error made by manual recording can be avoided; and the lower end of the measuring pipe is provided with the upper liquid drainage valve, the liquid storage barrel and the lower liquid drainage valve, so that the measuring operation is simple, and the repeated disassembling of the apparatus in the measuring processcan be avoided. Therefore, the electric-conductivity type sludge specific resistance measuring apparatus has the characteristics of capability of automatically recording data and simplicity in operation.

The invention relates to preparation of a three-dimensionally ordered macroporous MnCo2O4 spinel-type composite oxide. The preparation comprises the following manufacturing steps: a first step, weighing manganese acetate tetrahydrate and cobalt nitrate hexahydrate; a second step, adding methanol or mixed liquor of ethylene glycol and water to dissolve at room temperature; a third step, weighing glucose according to a ratio, adding into the solution of the second step and continuing to stir; a fourth step, adding a polymethyl methacrylate template and impregnating; a fifth step, pouring the impregnated mixed liquor into a buchner funnel for suction filtration, washing, and drying; a sixth step, placing a dried sample in a tube furnace, raising temperature from room temperature for multipletimes, and then dropping to room temperature. The preparation of the three-dimensionally ordered macroporous MnCo2O4 spinel-type composite oxide has the beneficial effects that a prepared catalyst hasa regular pore structure, a larger pore size, a higher specific surface area, the preparation of the three-dimensionally ordered macroporous MnCo2O4 spinel-type composite oxide can increase a comparative area of the catalyst, and improve contact performance between the catalyst and soot particles, in addition, by adding glucose, combustion temperature of the soot particles can be reduced, and activity of the catalyst can be increased.

The invention discloses a preparation method of a modified anhydride curing agent for extending applicability of an epoxy resin system. The preparation method comprises the following steps: adding 2-ethyl-4-methylimidazole and deionized water into a bottle, heating to 20-50 DEG C while stirring, dropwise adding a fixed amount of formaldehyde slowly, and rinsing by using deionized water after dropwise adding; heating to 60-90 DEG C, and preserving heat for 16-20 hours; removing a small amount of a supernatant, and neutralizing by using dilute hydrochloric acid till the pH is 7-8; extracting byusing a small amount of ethyl acetate, and then putting in a cold storage room to cool to 3-8 DEG C; performing suction filtration by using a Buchner funnel, washing by using water, putting a filter cake into a beaker, adding water, stirring for 20-50 minutes, performing suction filtration and washing by using water; drying the filter cake by using a 50-80 DEG C vacuum drying oven to obtain a latent accelerator; uniformly mixing the accelerator and an anhydride curing agent. The latent accelerator is used for modifying the anhydride curing agent in a form of a composite formula, so that the applicability of the epoxy resin system can be greatly extended and the problem of short applicability of epoxy resin is solved.

The invention relates to a phosphatidylcholine high-temperature purification method which belongs to a phospholipid technical field. According to the invention, alcohol-soluble phospholipid with a phosphatidylcholine content higher than 45% is adopted as a raw material, and is heated for 1h under a temperature of 100 DEG C; the material is cooled, and is dissolved in 12ml of n-hexane; the mixture is subjected to vacuum rotation evaporation desolvation and thermalization under an oil bath with a temperature of 180 DEG C, such that a black phospholipid thermalization product is obtained; acetone is added into the phospholipid thermalization product for washing, until the phospholipid thermalization product is oil-free; residual is dissolved in 85% ethanol, and the mixture is stirred for 10min; the mixture is subjected to centrifugation for 30min under a rotation speed of 4500rpm, such that an ethanol-soluble substance is obtained; the ethanol-soluble substance is added into a Buchner funnel paved with silica gel, and is eluted by using 85% ethanol; ethanol solution is collected; and vacuum ethanol removing is carried out, such that a product with a phosphatidylcholine content of approximately 90% is obtained.