950 results about "Centrifugal Filtration" patented technology

The invention relates to a preparation method of a nano-ZSM-5 molecular sieve, which belongs to the field of preparation of zeolite molecular sieve catalysts. The preparation method can solve the problem that the existing synthesis technology has the defects of easy emergence of mixed crystal phase, high cost, environmental pollution and easy loss of features of nanomaterials. The method is as follows: adding pre-crystallized crystal seeds into a gel system of the template-free synthetic nano-ZSM-5 molecular sieve, carrying out crystallization for 24 hours at the temperature of 160-180 DEG C,cooling to room temperature, carrying out centrifugal filtration on products, washing, drying and baking. The prepared nano-ZSM-5 molecular sieve is highly concentrated nanoscale crystals without themixed crystal phase; and the method has the advantages of low cost and environmental protection.

A method for extracting succinic acid from fermentation broth through cation resin exchange belongs to the biochemical technical field. The method comprises the following steps that fermentation broth undergoes heated centrifugal filtration or membrane filtration so as to eliminate thalli; sodium carbonate is added in the clear solution to generate magnesium carbonate precipitation; a filter cake is reclaimed after filtration; then, the filtrate flows through a cation resin column, and the effluent is succinic acid solution; a succinic acid product is obtained after decoloring, concentration and crystallization; the cation resin column is eluted by ammonium carbonate after exchange so as to obtain sodium bicarbonate effluent; sodium salt is reclaimed and reused in fermentation broth treatment after ammonia is eliminated by heating; furthermore, resin regeneration can be realized by sulphuric acid through a conventional method, and the generated (NH4)2 SO4 can be used as a fertilizer. The method does not need to carry out acidification for the filtrate, and has the advantages of short technological line and high yield, thereby realizing element cycle economy. The invention provides a method for extracting succinic acid from microorganism fermentation broth with simple operation and economical efficiency.

The present invention relates to a rare-earth doped low-temperature denitration catalyst and a preparation method thereof. The main active component of the catalyst is manganese oxide, the carrier is titanium oxide, and cerium oxide and iron oxide are used as cocatalysts. The preparation method includes the following steps: adding solutions of various metal nitrates into a metatitanic acid slurry, then adjusting the pH of the mixture to obtain complete precipitation by using concentrated ammonia, stirring for a while, and performing centrifugal filtration to the resulting suspension, and drying and calcining at a temperature to obtain the rare-earth doped low-temperature denitration catalyst; wherein the molar ratio of each element is as follows: Mn: Fe: Ce: Ti = 5: (0 ~ 2): 4:20. In the temperature range of 140-180 DEG C, the denitration activity of the metal oxide low temperature catalyst of the present invention can reach 80-98%, and the catalyst has a relatively excellent water and sulfur resistance performance.

The invention discloses a method for recovering potassium elements from sintering ashes of steel and iron works and preparing potassium sulfate. The method comprises the following main steps of: A. removing potassium by adopting a circulating industry washing leaching solution mode, and carrying out solid-liquid separation on suspension liquid by adopting a centrifugal filtration or centrifugal precipitation mode; B. adding NH4HCO3 into the potassium removing solution for removing impurities, and adding active carbon or industrial coke powder for decoloration; and C. adding industrial (NH4)2SO4 for evaporation and crystallization to prepare the potassium sulfate. The invention can completely eliminate corrosion caused by circulating gathering of alkali metal of potassium, sodium and the like in the iron-making blast furnace and the adverse effects on sintering electric dedusting system efficiency and the like when the sintering ashes are reused as ingredients directly, and simultaneously realize high-efficiency recycling of the potassium resource.

Provided are system of value resource in acidic corrosion waste fluid and a recycling method. The recycling method of the invention includes the following steps that adding oxidation agent and concentrated sulfuric acid into the corrosion waste fluid, pre-heating and heating the corrosion waste fluid, evaporating out water vapor and hydrogen chloride under negative pressure and recycling hydrochloric acid, the residue separates hydric sulphate from blue copperas crystal via centrifugal filtration and recycle hydric sulphate, washing blue copperas crystal by blue copperas crystal solution and absolute ethyl alcohol and recycling blue copperas. The recycling system comprises an oxidation ditch, a dosage bunker, a pre-heater, a heat booster, an evaporation tank, a filter, a cooler, a spraying and absorbing device and the like. The recycling method of the invention increases the recovery rate of metal copper and hydrogen chloride, with both recovery rates more than 99%. The method can employ scheme of batch operation or continuous recycling, which is adapted for industry utilization.

Filtration device suited for concentration of liquid samples, particularly biomolecules, and a method of concentrating, desalting, purifying and / or fractionating liquid samples. In certain embodiments the device includes a housing having a sample reservoir, and two substantially vertically oriented and spaced apart membranes disposed in the housing. An underdrain is associated with each membrane such that fluid passing through each membrane flows through a respective underdrain into a filtrate collection chamber. The fluid that does not pass through the membrane is collected in the retentate collection chamber, and can be recovered such as by a reverse spinning step, achieving recoveries greater than about 90%. The substantially vertical orientation of the membranes increases the available membrane area by at least 2.7 times the area available in a conventional filter device. The two-panel configuration also maintains more available membrane area in use during the last stages of filtration than a one-panel configuration.

A method and a device for separating a component, such as fibrin I from blood, by centrifugation. The method involves feeding of blood admixed an anticlotter to a first annular chamber in a device, where the annular chamber is defined by a cylindrical outer wall and a cylindrical inner wall, both walls extending coaxially about a common axis, as well as by a top wall and a bottom wall, where the top wall or the bottom wall is formed by a piston body displaceable within the first chamber. The method involves furthermore a centrifugation of the device about the said common axis followed by a resulting liquid fraction being transferred while influenced by the piston body to a second chamber defined by an outer cylindrical wall, which extends coaxially with said common axis. As a result the liquid fraction present in the second chamber is caused to be further separated by a continued centrifugation and addition of suitable compositions promoting the separation and returning of the non-utilizable portion to the first chamber. In addition, the portion of the liquid fraction remaining in the second chamber is transferred to a liquid-receiving container through a filter optionally after addition of a solvent. The portion of the liquid fraction remaining in the second chamber prior to the transfer to the liquid-receiving container is transferred to a third chamber coaxially accommodated with the other chambers, and the liquid now present in said third chamber is caused to pass through an annular filter during the centrifugation so as to enter an annular outer compartment which is adapted to be connected to the liquid-receiving member.

A method for sorption extraction of succinic acid in fermentation broth by an anion resin belongs to the biochemical technical field. The method comprises the following steps that succinic acid fermentation broth undergoes decoloring treatment by heated active carbon; fungus residue is eliminated through centrifugal filtration or microfiltration membrane filtration; the obtained fermentation clear solution is adsorbed by an alkaline anion resin column, and impurity is flushed away by water after adsorption saturation and then is eluted by hydrochloric acid solution or sulfuric acid solution, thereby obtaining succinic acid solution; the succinic acid solution undergoes depressurized concentration and crystallization so as to obtain a succinic acid product; moreover, MgCl2 and residual sugar in effluent after anion resin column adsorption of the fermentation broth is reclaimed; the MgCl2 in the effluent generated during anion resin adsorption is passed through CO2 or (Na)2CO3 so as to prepare magnesium carbonate which is reclaimed and used in buffering and adjusting pH during fermentation; and sugar in filtrate is reclaimed and used in fermentation ingredients for further fermentation. The method can realize recovery and reuse of materials during operation, and substantially reduces material consumption during extraction; moreover, the method reduces the treatment cost of waste water for environmental protection, and increases the economic benefit of products.

The invention discloses a method for concentrating a tobacco extraction liquid in the production of a tobacco sheet by a papermaking process, which comprises the following steps of: a, extracting tobacco stems and tobacco fragments by water or ethanol solution respectively, and then performing solid-liquid separation; b, obtaining an tobacco fragment extraction liquid, a tobacco stem extraction liquid or one of the tobacco fragment extraction liquid and the tobacco stem extraction liquid for centrifugal filtration, and then concentrating a filtrate through a reverse osmosis membrane; and c, then performing vacuum decompression concentration or spray drying concentration on concentrated solution. The method solves the problems that the tobacco sheet by the papermaking process has poorer inherent smoking quality and plain tobacco fragrance and how to furthest utilize waste tobacco during the processing of cigarettes, reasonably utilizes the resource, and improves the inherent quality of the cigarettes. The tobacco sheet prepared by the method has better taste and full and natural tobacco fragrance.

The invention provides an extraction and purification method of cordycepin from Cordyceps militaris, and belongs to the deep-processing technical field of agricultural products. The method comprises the following steps: crushing Cordyceps militaris raw material, mixing the raw material with water at 1:20 raw material / water ratio, performing ultrasonic extraction, and performing centrifugal filtration on obtained extracting solution and pouring in a macroporous resin column at the adsorption flow of 1.8BV / hr; taking 15% methanol aqueous solution as an eluant to perform resin column elution, and decompressing and condensing obtained eluent at the temperature of 60 DEG C by a rotary evaporator to obtain Cordyceps militaris cordycepin concentrate. The method can help realize aqueous solution extraction of the cordycepin from the Cordyceps militaris raw material at low temperature, and the extraction rate reaches 85%; and polysaccharide and protein can be removed from the extract by macroporous resin separation and purification, thus the content of the cordycepin in the extract can reach 10%. The cordycepin in the Cordyceps militaris product has high activity, can be taken as a raw material for producing cordycepin monomer and can also be directly taken as an additive of health products and functional food, thus the cordycepin has wide market development prospect.

The invention relates to a purification method of long-carbon-chain dicarboxylic acid, belonging to purification treatment of cycle-free dicarboxylic acid with more than 10 carbon atoms. The invention is characterized in that recrystallizing purification is performed by using a long-carbon-chain dibasic acid crude product produced by a microbial fermentation process as an initial raw material and methanol as a solvent. The method comprises the following steps: (1) dissolving and decolorizing: a. feeding at room temperature, b. dissolving by preheating, c. decolorizing by adsorption, and d. four-stage filtering; (2) gradient cooling and crystallization; (3) eluting and centrifugal filtration; and (4) vacuum drying. The technical indexes of the purified long-carbon-chain dicarboxylic acid are as follows: the single acid content is at least 90.20%, the total acid content is 99.60 wt%, the ash content is at most 30 ppm, the iron content on the basis of Fe2O3 is at most 2 ppm, the total nitrogen on the basis of N is at most 30 ppm, the moisture content is at most 0.4 wt%, and no ester content is detected. The purification yield of C11-C14 is greater than or equal to 98.4%. The long-carbon-chain dicarboxylic acid is suitable to be used as a polycondensation monomer to perform polycondensation reaction with diamine to synthesize the long-carbon-chain nylon, and is also suitable to be used as a raw material of synthetic perfume and drugs. The purification method of long-carbon-chain dicarboxylic acid has the advantages of favorable product color, high product purity, high refinement yield and lower cost.

The invention discloses a method for preparing a coconut-water beverage. The method comprises the following steps: (1) breaking coconuts and then getting coconut water, adding an ascorbic acid the weight of which accounts for 0.1-0.15% of that of the coconut water into the coconut water, then stirring the obtained mixture so as to dissolve the ascorbic acid; (2) adding water into the solution obtained in the step (1), then stirring the obtained mixture, wherein the weight ratio of the water to the coconut water is (0.5-1.2): (4-5); (3) adding cane sugars into the aqueous solution obtained in the step (2), adjusting the sugar degree of the obtained mixture to 7.0-8.00 Brix, then adding a citric acid into the obtained product, and adjusting the pH value of the obtained mixture to 4.6-4.8; and (4) carrying out membrane filtration sterilization and ultrahigh-pressure low-temperature sterilization on the aqueous solution obtained in the step (3) so as to obtain the coconut-water beverage. The invention also discloses a coconut-water beverage. The coconut-water beverage and preparation method thereof disclosed by the invention have the advantages that because of changing the traditional heat treatment technology for sterilization and adopting the combination of low temperature membrane filtration sterilization and high pressure low temperature sterilization, the purposes of sterilization and refreshment are achieved, the unique flavor, nutrition and functional components of the coconut water are effectively kept, and the quality guarantee period of the prepared coconut-water beverage is long; and through filtering large particles in the coconut water through centrifugal filtration and membrane filtration, the prepared coconut-water beverage is clear, soft, delicate, pure and fresh.

The invention discloses a device for recycling mud and a diesel oil base from waste oil-base mud and belongs to the technical field of processing of pollutants generated in the process of oil and gas drilling. By the adoption of the device for recycling the mud and the diesel oil base from the waste oil-base mud, the oil-base mud is recycled from oil-containing refuse, such as the waste oil-base mud and drilling cuttings containing oil, generated in the oil-base mud drilling process through the centrifugal filtration-centrifugal sedimentation coupling technology, and the diesel oil base is recycled from a separated low-oil-content solid phase through a leaching-evaporation separating device. The recycled oil-base mud can be reused in drilling engineering. The recycled diesel oil base can be used for re-preparation of the oil base mud. According to the device for recycling the mud and the diesel oil base from the waste oil-base mud, resource recycling and harmless treatment of the oil-containing refuse generated in the oil-base mud drilling process are achieved, cost is low, no secondary pollution is caused, resources can be recycled, operation is easy, the oil-base mud and the diesel oil base are recycled from the oil-containing refuge as much as possible, and the recycled oil-based mud can be reused.

The invention discloses high-protein yoghourt and a making method thereof. The protein content of the product is over 9.5 percent, and the fermented milk contains 86 to 96 percent of raw cow's milk, 0 to 3.0 percent of concentrated lactalbumin, 3.0 to 6.0 percent of white granulated sugar, 0 to 2.0 percent of diluted cream, and 1 to 3 percent of lactic acid bacteria first-generation leavening agent. The making method comprises: preparing the lactic acid bacteria first-generation leavening agent, standardizing the raw cow's milk, mixing material, degassing, homogenizing, sterilizing, cooling, inoculating the lactic acid bacteria first-generation leavening agent, fermenting, centrifugally filtrating and concentrating, packaging, cooling and obtaining finished products. According to the high-protein yoghourt making process discloses by the invention, the raw cow's milk is made of high-quality raw cow's milk with total bacterial count of less than 20,000cfu / ml, the fermented milk is concentrated by centrifugal filtration, the nutrition of the yoghourt is more than 4 times that of common yoghourt, and high-nutrition yoghourt is made; after the being concentrated, the yoghourt is more fragrant and tastes thicker and finer; and in a 21-day quality guarantee period, the product is stable.

The invention discloses a production method of aronia melanocarpa extract. The method particularly comprises the steps that aronia melanocarpa fruits are broken, 6-20 times of extraction solvent is added, then circulating ultraphonic (wave) extraction, centrifugal filtration, macroporous resin adsorption, elution and concentration drying are sequentially performed, and the aronia melanocarpa extract is obtained. The production method of the aronia melanocarpa extract utilizes a circulating ultraphonic extraction-resin adsorption purification coupling technology and has the advantages of being simple in technology, high in extraction efficiency, production efficiency and product quality, capable of saving energy and achieving industrialized production and the like.

The invention discloses an industrial preparation method of quercetagetin and belongs to the technical field of extraction and preparation of flavonoid compounds. Marigold residues are uniformly mixed with alcohol, the mixture is heated to the extraction temperature and extracted in an ultrasonic-assisted extraction manner, then, centrifugal filtration, concentration, centrifugal filtration and purification are performed, and finally, a quercetagetin product is obtained. According to the preparation method, waste marigold residues are taken as a raw material, and resource waste and environment pollution are reduced; the extraction is performed in the ultrasonic-assisted extraction manner, and the production continuity is conveniently and effectively guaranteed on the basis of high efficiency and energy conservation; the production energy consumption is reduced by means of a normal-temperature water washing and purification processing technology, and the production cost is reduced; the purity of the quercetagetin product extracted with the method is higher than 85%, and the yield is 2.5%-3.8%.

The invention discloses a method for preparing pitch used for producing coal-based needle coke. The method comprises the following steps that: coal tar and coal pitch are taken as raw materials; coal tar light compositions are taken as solvent; coal dust, metallurgical coke powder, or mixture of the metallurgical coke powder and diatomite, or mixture of the metallurgical coke powder and expanded perlite are taken as filter aid; uniform filter aid filter cakes are formed in a centrifuge by filter aid mixture at first, and then mixture of the coal pitch or the coal tar, wash oil and the filter aid is added into the centrifuge in which the uniform filter aid filter cakes are formed for centrifugal filtration; and obtained centrifugate is driven to pass through atmospheric distillation recovery solvent, so as toe obtain the refining pitch raw materials which are suitable for producing the coal-based needle coke. The yield of the pitch raw materials used for producing the coal-based needle coke prepared by the technology is improved by 10 to 15 percent compared with other methods; the manufacturing technique is simple and the preparation cost is low; and the mass production is easy to realize.

The invention discloses a method for preparing a freeze-dried human blood coagulation factor VIII. The method comprises the following process of: dissolving by taking water for injection, comprising 3-10 IU (International Unit) / ml of heparin, as a heparin sodium solution and cryoprecipitating; performing PEG (Polyethylene Glycol) precipitation and taking supernatant; performing centrifugal filtration; performing S / D (Solvent / Detergent) inactivation at the temperature of 24-26 DEG C; performing DEAE (Diethylaminoethyl) Sepharose Fast Flow chromatographic column balance, adsorption, washing andelution; performing molecular membrane ultrafiltration; preparing, removing bacteria, sub-packaging, freeze-drying and capping; and dry-heating at the temperature of 99.5-100.5 DEG C and inactivating. In the invention, the process method of combining the PEG precipitation and an ion exchange chromatography technology is adopted; the method is easy and convenient to operate; the F VIII active recovery rate is increased; miscellaneous proteins can be removed on a large scale; the product yield reaches over 60 percent; and the specific activity of the product reaches 5 IU / mg and is obviously greater than a value which is not less than 1 IU / mg stipulated in the pharmacopeia. Meanwhile, the PEG residue is 0.08g / L which is obviously less than the value which is less than or equal to 0.5 IU / mg stipulated in the pharmacopeia, so that Al<3+> residues in the final preparation of an Al(OH)3 gel method are avoided; the product has high purity and high safety; and the quality of the final product is obviously improved.

Filtration device suited for concentration of liquid samples, particularly biomolecules, and a method of concentrating, desalting, purifying and / or fractionating liquid samples. In certain embodiments the device includes a housing having a sample reservoir, and two substantially vertically oriented and spaced apart membranes disposed in the housing. An underdrain is associated with each membrane such that fluid passing through each membrane flows through a respective underdrain into a filtrate collection chamber. The fluid that does not pass through the membrane is collected in the retentate collection chamber, and can be recovered such as by a reverse spinning step, achieving recoveries greater than about 90%. The substantially vertical orientation of the membranes increases the available membrane area by at least 2.7 times the area available in a conventional filter device. The two-panel configuration also maintains more available membrane area in use during the last stages of filtration than a one-panel configuration.

The invention discloses a method for preparing cellulose nanofiber dispersion liquid, which comprises the following steps: dispersing a cellulose raw material in a drainage buffer solution system with a pH value of 4-5, and adding laccase and TEMPO so as to prepare a laccase-TEMPO oxidation system; continuously pumping oxygen into a reaction system so as to carry out oxidation reaction for 24-130 hours; after the reaction is completed, carrying out centrifugal filtration on the obtained object so as to obtain supernatant for repeated use; cleaning an obtained precipitate (i.e. water-insoluble oxidized cellulose) to be neutral by using deionized water; and adding deionized water, stirring the obtained mixture so as to obtain an oxidized cellulose water suspension, carrying out homogenation and ultrasonic treatment, and centrifugalizing the obtained object so as to obtain supernatant, i.e. oxidized cellulose nanofiber dispersion liquid. According to the invention, the oxidation efficiency is guaranteed, and the pollution caused by halogen elements to the environment is avoided; and the reaction system can be repeatedly used, so that the utilization rate of the oxidation system is improved, the oxidation effect is uniform, the yield of cellulose nanofibers is increased, and high-length-to-diameter-ratio nanofibers can be obtained.

The invention provides a production method of a high active corn bran dietary fiber and the product thereof, and belongs to the technology field of the agricultural product deep processing. The invention comprises that the corn bran raw material is mixed with the corn starch by proportion of 1:4 after being pulverized, and extrusion pressing and puffing are performed; enzymolysis is performed with high temperature-alpha-amylase, next, the high active corn bran dietary fiber is prepared through the enzymolysis with acid protease, through the centrifugal filtration, is molded by drying below 75 DEG C, and then the light yellow corn bran dietary fiber is produced. The invention technology can improve the microstructure and the composition of the corn bran dietary fiber, and the dissoluble dietary fiber content is improved by 10 to 40 percent; the component of starch as well as protein in the dietary fiber can be removed by using the technology of enzymatic hydrolysis, and the dietary fiber content can be up to 90 percent. The product corn bran dietary fiber with high purity and high activity meets the needs of the general consumers to the pure natural and high active dietary fiber food, and thereby, the product corn bran dietary fiber has a broad market development prospect.

A method for preparing light type chicken bouillon seasoning belongs to the technical field of seasoning processing, adopts a chicken and chicken bone enzymolysis method and comprises 20-60 parts of chicken enzymolysis hydrolysate subjected to enzymolysis of a water-soluble system, 0.1-0.5 part of protein multi-peptide of chicken skeletons with molecular weight of 1000-5000 Da subjected to enzymolysis of an alcohol-soluble system and other raw materials including 1-8 parts of reducing sugar, 0.5-6 parts of amino acid, 1-3 parts of vitamin B10, 1-8 parts of oxidized chicken oil, 0.1-5 parts of yeast extract, 0.5-1.5 parts of ginger, 0.1-1.0 part of I+G, 0.1-1.0 part of monosodium glutamate and 10-20 parts of salt. The method comprises the steps of washing chicken breast, mincing the chicken breast into meat paste through a meat mincer, adding composite enzyme for hydrolysis after performing homogeneity according to a certain feed liquid ratio, controlling certain hydrolysis degree and performing hydrolysate centrifugal filtration; additionally preparing chicken skeleton protein polypeptide; adding the chicken skeleton protein polypeptide and auxiliary materials in chicken enzymolysis hydrolysate to perform heat reaction so as to obtain the delicious and colorful chicken bouillon seasoning with good flavor.

The invention relates to a nourishing oral liquid of bee pollen and process for preparation, which comprises extracting bee pollen grease through hypercritical fluids, reclaiming solvent to obtain bee pollen cakes, carrying out centrifugal filtration and film separation, allocating bee pollen penetrated liquid and auxiliary materials including water, fructose syrup, bee honey, cane sugar, citric acid and perfume compound, finally carrying out vacuum degasification, high temperature instantaneous sterilizing, and asepsis canning.

The invention discloses a preparation method of nylon powder for selective laser sintering. The stability of a melting point of the nylon powder material prepared through the method is high, and the quality and performance of a selective laser sintering product are greatly improved. The method mainly includes the following steps that 1, sufficient binary acid, diamine and ethyl alcohol are placed in a reaction vessel, a nylon salt solution is prepared through a reaction, and copolymerized nylon salt is obtained after centrifugal filtration; 2, the obtained nylon salt is placed in a microwave drying instrument to be dried for 10-30 min at the temperature of 30-40 DEG C, and the treated dry nylon salt is obtained; 3, the dry nylon salt, a molecular weight modifier and deionized water are added to an airtight polyreactor, and copolymerized nylon particles are obtained through a copolymerization reaction; 4, the prepared copolymerized nylon particles are prepared into copolymerized nylon powder through a solvent precipitation method; 5, the copolymerized nylon powder, a flow promoter and an antioxygen are mixed, and the nylon powder for selective laser sintering is obtained.

The invention belongs to the field of electrochemistry, and discloses a heteroatom-doped graphene material with a hole in the surface and preparation and application thereof, as well as a device. The method comprises the following steps: adding concentrated HNO3 into a graphene oxide aqueous solution, sealing, performing ultrasonic reaction, stewing, pouring into deionized water, and performing centrifugation, filtering and drying to obtain graphene oxide with the hole in the surface; then putting the graphene oxide with the hole in the surface into a plasma high-temperature tubular reactor, vacucumizing, feeding protective gas and a heteroatom-doped source compound, heating, turning on a radio frequency power supply, performing plasma discharging for 10-60 minutes, turning off radio frequency and a heating power supply to stop feeding the heteroatom-doped source compound, and cooling to obtain the heteroatom-doped graphene material with the hole in the surface. The prepared material is higher in oxygen reduction catalysis activity and better in poisoning resistance effect and can be applied to the field of anode materials of a proton exchange membrane fuel battery, a direct alcohol type fuel battery and a metal-air battery.

The invention discloses a preparation method and a use of a functional graphene-loaded palladium nanoparticle composite material. The preparation method comprises the following steps of carrying out ultrasonic dispersion of graphene in water to obtain a graphene suspension liquid, adding a pyrenetetrasulfonic acid sodium salt aqueous solution into the graphene suspension liquid, carrying out heating stirring for 8-15h, carrying out centrifugal filtration to obtain functional graphene, dispersing the functional graphene in water to obtain a functional graphene suspension liquid, adding a palladium chloride solution into the functional graphene suspension liquid, adding a sodium borohydride solution into the mixed solution, carrying out heating stirring for 8-15h, and carrying out centrifugal filtration to obtain the functional graphene-loaded palladium nanoparticle composite material. Through functionalization of graphene by the pyrenetetrasulfonic acid sodium salt, dispersibility and stability of graphene and palladium nanoparticles are improved. A glassy carbon electrode modified by the functional graphene-loaded palladium nanoparticle composite material has a good nitroaromatic compound catalysis performance, a low nitroaromatic compound detection limit, a wide nitroaromatic compound detection linear range, high nitrobenzene detection sensitivity, a nitrobenzene detection linear range of 170-8ppb, and a nitrobenzene detection limit of 0.62ppb.

The invention relates to a method for refining high purity cation integral dimethyl allyl amchlor. It uses chromatographic analysis method to assay determinate each volatile and non-volatile impurity substance component and the content of the cation integral solution, it adds cation integral solution in the tank and adds industry caustic soda solution to inactivating delivery the amine substance, it adds water so that the integral content of the solution is 35%~55%, it dose vacuum distillation on the two temperature ranges of the negative pressure, the vapor can be reclaimed by absorbing, the reacting liquid expels the expressed crystal NaCl after concavation or centrifugal filtration; it adds water into the filter liquid to adjust the integral content of the integral solution and adds a little of activated carbon to do decolouring treatment, it filters the activated carbon to obtain the cation integral product solution with little foreign substance and high purity.

The invention discloses a method for preparing nano-cerium oxide and zirconia solid solutions, which belongs to the field of inorganic catalytic materials. The method comprises: dissolving cerium-containing ionic compound accounting for 10 to 90 percent of the weight of the raw materials and zirconium-containing ionic compound accounting for 10 to 90 percent of the weight of the raw materials in deionized water respectively according to a formulation of raw materials of nano-cerium oxide and zirconia solid solutions, and preparing the two into solutions with the concentration between 1 and 3 M; mixing the two solutions, adding alkaline substances, regulating pH between 7 and 10 to generate precipitate, aging the precipitate through heat treatment, performing washing and centrifugal filtration to obtain a filter cake; dissolving the obtained filter cake in nitric acid, adding surfactant to obtain milky white colloid; and performing calcination to prepare composite oxide of nano-cerium oxide / zirconia. Nano-sized particles prepared by the method improve the microstructure of cerium / zirconium solid solutions, and the prepared nano-composite oxide solid solutions have better thermal stability and larger specific surface area.

The invention provides a reusable method of decanedioic acid phenol-containing wastewater, which comprises the following steps: providing decanedioic acid mother liquid which is prepared by neutralizing and acidating and crystallizing a sebacate solution; carrying out solid-liquid separation to the mother liquid to obtain a decanedioic acid solid and first wastewater, reusing the first wastewater, for example, part of the first wastewater is recycled to be used in a neutralization step; neutralizing and extracting balance of the first wastewater, removing phenol, performing pervaporation and removing by-product which is sodium sulfate to obtain third wastewater that is recycled to be used in the neutralization step or as flushing water in a centrifugal filtration step or is biologically treated to obtain fourth wastewater satisfying the discharge standard; or laminating the decanedioic acid mother liquid to obtain lower layer dope (part A) which contains crystallized decanedioic acid and upper clear solution (part B); carrying out solid-liquid separation to the lower layer dope (part A) which contains crystallized decanedioic acid to obtain the decanedioic acid solid and the first wastewater; carrying out solid-liquid separation to the upper clear solution (part B) to obtain the decanedioic acid solid and second wastewater; and reusing the first wastewater and the second wastewater.