928 results about "Polymeric adsorbent" patented technology

Size-selective hemocompatible porous polymeric adsorbents are provided with a pore structure capable of excluding molecules larger than 50,000 Daltons, but with a pore system that allows good ingress and egress of molecules smaller than 35,000 Daltons. The pore system in these porous polymeric adsorbents is controlled by the method of synthesis so that 98% of the total pore volume is located in pores smaller than 300 Angstroms (Å) in diameter with a working pore size range within 100 to 300 Å in diameter. The porous polymeric adsorbents of this invention are very selective for extracting midsize proteins, such as cytokines and β2-microglobulin, from blood and other physiologic fluids while keeping the components required for good health such as cells, platelets, albumin, hemoglobin, fibrinogen, and other serum proteins intact.

The invention relates to a clean technique for co-producing xylose, xylitol and arabinose from agricultural and forestal waste, belonging to the field of utilization of agricultural and forestal waste. The technique comprises the following steps: pretreating and preprocessing the raw material, and hydrolyzing in a thermophilic digestion mode to prepare a hemicellulose hydrolysate; after centrifugalizing to remove solid residues, carrying out TiO2-loaded activated carbon photocatalysis or ion exchange resin decolorization and detoxification treatment on the hydrolysate; carrying out MVR (mechanical vapor recompression) concentration treatment and gradient-cooling crystallization to obtain a xylose product and a xylose mother solution; fermenting L-arabinose unconverted xylitol fermentationhigh-yield strain xylitol by using the xylose mother solution as the medium to produce the xylitol; centrifugalizing to remove thalli, and carrying out decolorization and desalting treatment by membrane-process or resin adsorption; separating by using a simulated moving bed or chromatographic separation technology to obtain a xylitol phase and an L-arabinose phase; and carrying out MVR or vacuum concentration treatment on the two phases, and crystallizing in a gradient programmed cooling mode to respectively obtaining a xylitol product and an L-arabinose product, wherein the two mother solutions can be recycled.

The invention discloses a preparing method for a bamboo leaves flavone extractive, which includes the following steps: breeds with high flavone content which are selected form 30 kinds of bamboo leaves can be taken as the production materials trough HPLC method; the selected bamboo leaves are dried at low temperature and lucifuge and smashed; and the C1-C3 is used for extracting; the lixivium is filtered and condensed in vacuum so as to obtain bamboo leaves gross extractive; and the gross extractive is purified through centrifugalizing, ceramic membrane, ultrafiltration membrane, nanofiltration membrane so as to obtain the bamboo leaves processed liquid; and the bamboo leaves processed liquid is separated and purified by certain size polymeric adsorbent resin, and is cooled to dry in vacuum or to dry with sprayer, so as to obtain the bamboo leaves flavone extractive with 40% to 65% of the flavone content.

The invention relates to a method for extracting anthocyanin from a cowberry. The method comprises the following steps: taking cowberry fruits, crushing the cowberry fruits, and squeezing the fruits into juice; centrifugating the juice to obtain fruit residues and fruit juice respectively; controlling the temperature of the operation process to less than or equal to 60 DEG C; soaking the obtained fruit residues in a 1 to 10 percent acid-water solution at an operation temperature of between 30 and 50 DEG C; soaking, stirring and extracting the fruit residues for 2 to 3 times, and soaking and stirring the fruit residues for 1.5 to 2 hours every time to obtain an extracting solution; mixing the extracting solution finally obtained and the fruit juice to form a mixed liquor, centrifugating the mixed liquor at a high speed, taking a supernate to carry out ultrafiltration by inorganic film ultrafiltration equipment to obtain a film filtering liquid; purifying resin; controlling the temperature of the operation process to less than or equal to 60 DEG C; adsorbing the film filtering liquid finally obtained to saturate by the resin; washing the resin adsorbed to saturate by water; removing impurities from the resin until washing water shows colorless; desorbing the macroporous absorbent resin by 30 to 50 percent ethanol or methanol, and collecting an effluent liquid; and concentrating and drying the effluent liquid to obtain the anthocyanin.

The invention discloses a method for extracting stevioside from fresh stevia rebaudiana leaves, which comprises: crushing fresh stevia rebaudiana leaves with homogenizing crushing equipment under a condition of water, performing pressure filtration in continuous automatic discharge filtering equipment, subjecting the filtrate to flocculation by mixed flocculating agent; and absorbing by resin, analyzing, desalting and decolorizing by resin, concentrating and spray drying to obtain the stevioside product. In the invention, time and working procedures are saved, a long-distance transport process is avoided, raw material cost is lowered, discharge of waste water is reduced greatly, and clean production can be realized basically.

The embodiment of the invention discloses a polymeric adsorbent and a preparation method thereof. The preparation method comprises the following steps of: preparing a bead-like resin from chloromethyl styrene serving as a polymerization monomer and divinyl benzene serving as a cross-linking agent by a suspension polymerization method; and adding a hydroxyl-containing monomer at the post-crosslinking stage to perform super cross-linking reaction so as to prepare the polymeric adsorbent. In the method, pores are formed in the polymeric adsorbent at the post-crosslinking stage of polychloromethyl styrene by using a chemical modification method, and polar groups are formed on the frame of the polymeric adsorbent by introducing the hydroxyl-containing monomer for modification, so the adsorption of an adsorbent substance by the polymeric adsorbent is increased. The preparation method provided by the invention is simple and the substances harmful to human body such as chloromethyl ether and the like and pore-forming agents are not used in the method. Experimental results show that the polymeric adsorbent prepared by the invention has the advantages of high specific surface area, small aperture, high adsorption selectivity and particularly high capacity of absorbing aromatic compounds.

Macroporous polymers having selected porosity and permeability characteristics that provide rigid polymer matrices suitable for use in medium and high pressure reversed phase liquid chromatography (RPC) are disclosed. A method for preparing the polymers using selected mixed porogens in selected proportions relative to the monomer phase is also disclosed. The polymers are especially useful as stationary phases in large scale chromatography columns without developing increased pressures during prolonged use, while maintaining good chromatographic performance for targeted biomolecules, such as insulin.

The invention discloses a process method for synchronously producing pueraria starch and pueraria flavonoid. The process method is characterized by comprising the following steps of: adding water to clean a fresh pueraria raw material, crushing the fresh pueraria raw material after cleaning, and adding water to grind the raw material into thick liquid, wherein the ratio of liquid to the raw material is 1:10; screening powder to remove residues by adopting a filter method to obtain pueraria starch slurry and pueraria residues mainly comprising fibers respectively, and drying the pueraria residues for later use; performing centrifugal separation on the pueraria starch slurry to remove protein and separate waste water, and collecting the waste water for later use; performing centrifugal dewatering and drying on the starch thick slurry after removing the protein and the waste water through separation to obtain the pueraria starch; soaking the pueraria residues obtained by the step (2) in ethanol, and performing reflux extraction, and condensing the extracting solution to obtain pueraria crude total flavonoid; standing the waste water obtained by the step (3) for deposition, taking supernatant fluid, and performing column chromatography through macro-porous polymeric adsorbent to adsorb the flavonoid; eluting the flavonoid through a resin column by using ethanol, and concentrating the eluant to obtain the pueraria crude total flavonoid.

The invention provides a treatment process for a chemical nickel plating waste liquid in the circuit board industry. The treatment process comprises the following steps: pumping the chemical nickel plating waste liquid in the circuit board industry into a reaction tank; sequentially adding sulfuric acid for acidifying; adding ferrous sulfate and hydrogen peroxide for Fenton oxidation complexation; adjusting the pH by sodium hydroxide; adding sodium sulfide for a coagu-flocculation reaction; finally, adding PAM until suspended solids are just flocculently separated; after acidification, advanced oxidation complexation, and flocculation, filter-pressing all the waste liquid by a plate-frame; collecting the filtrate and regulating the pH; and sequentially carrying out sand filtering and resin adsorption and discharging after reaching standard level. The treatment process provided by the invention can be used for effectively treating the chemical nickel plating waste liquid in the circuit board industry, so that the treatment cost and the standard-reaching difficulty of the waste liquid in an enterprise are reduced.

The invention discloses a coking wastewater comprehensive treatment method comprising the following steps of: pre-treatment, biochemical treatment and deep treatment. The deep treatment step comprises sequential steps of filtering, ultra-filtering, carrying out resin adsorption, re-filtering, and carrying out reverse osmosis. With the adoption of a coking wastewater comprehensive treatment system of the coking wastewater comprehensive treatment method, the pre-treatment step adopts a de-oiling pond, an adjusting pond and an air floating pond, which are connected in sequence; the biochemical treatment step adopts a primary aeration pond, a primary settling pond, an oxygen-poor pond, an aerobic pond and a secondary settling pond, which are connected in sequence; and the deep treatment step adopts a multi-medium filter, an ultra-filtering device, a resin adsorption column and a reverse osmosis device. The coking wastewater comprehensive treatment method has the beneficial effects that the method is stable to operate and has a simple process and good treating effects.

The invention discloses a method for co-production of de-boned raw chicken, chicken bone soup-stock and chondroitin sulfate using chicken skeletons. The method comprises the following steps: putting the chilled chicken skeleton in a deboner to separate a product A de-boned raw chicken and chicken bone residues; processing the separated chicken bone residues through hot-pressing extraction, vibrating residue removal and oil-water separation to obtain a bone soup and chicken bone oil, adsorbing and eluting the bone soup by using macroporous resins to obtain a product B chondroitin sulfate; processing the deoiled bone soup remained after the resin adsorption through double effect concentration or MVR concentration, homogenizing and blending the concentrated bone soup and the chicken bone oil to obtain a product C chicken bone soup-stock. The co-produced de-boned raw chicken has a fresh color, rich nutrition, a good emulsifying property of the de-boned chicken, and the de-boned raw chicken can be raw materials for meat product processing. The co-produced chicken bone soup-stock product has a delicate taste, a rich chicken flavor, rich nutrition, and can be used as a natural soup base in food. The purity of the co-produced chondroitin sulfate is 87.41%, and the molecular weight is 5.283e[+4].

The invention discloses a hop extract containing xanthohumol. The hop extract is yellowish in color and lustre, is powdery, has specific scent of hop and has the xanthohumol content of more than 90 percent. Simultaneously, the invention also discloses a method for preparing the hop extract containing the xanthohumol; raw materials are subjected to extraction through an aqueous solution of ethanol or methanol, concentration, macroporous resin adsorption, elution and drying to obtain the hop extract containing the xanthohumol; the content of the xanthohumol is more than 90 percent; and the obtained product has high content of xanthohumol and small content of iso-xanthohumol.

Compositions of purified and biologically active ellagitannins are provided by separation from pomegranate husk using a method of extraction and purification using a solid polymeric adsorbent and the uses of the said compounds

A cinobufotalin freeze dried injection and preparation process thereof are disclosed. It is prepared by cinobufotalin effective part and pharmaceutical adjuvant extracted from dry toad skin. The effective part of cinobufotalin is obtained by alcohol extraction, centrifugation and macropore polymeric adsorbent separation and purification. Wherein, the main effective component indole total alkaloid content is over than 30%. The content assay result and pharmaceutical examination result indicates that the cinobufotalin freeze dried injection has a higher content of effective part and stronger pharmaceutical function.

The invention provides a high-hydrophobicity microporous polymeric adsorbent which is polymerized and crossly linked by (1) styrene, (2) p-methyl styrene, 4-tert-butylstyrene, 4-isobutyl styrene or a mixture of the p-methyl styrene, the 4-tert-butylstyrene and the 4-isobutyl styrene according to an arbitrary proportion and (3) divinyl benzene. The compositions by weight portion of the polymeric adsorbent are: 30 to 70 portions of (1) the styrene, 20 to 60 portions of (2) the p-methyl styrene, the 4-tert-butylstyrene, the 4-isobutyl styrene or the mixture of the p-methyl styrene, the 4-tert-butylstyrene and the 4-isobutyl styrene according to the arbitrary proportion, and 2.5 to 10 portions of (3) the divinyl benene; the specific surface area of the polymeric adsorbent is more than or equal to 820m2 / g; the pore volume of the polymeric adsorbent is more than or equal to 0.5cm3 / g; the microporosity of the polymeric adsorbent is more than or equal to 50 percent; the pore diameter of the polymeric adsorbent is concentrated between 1.5 and 2.2nm; and a wrapping angle between the polymeric adsorbent and water is between 130 and 149 degrees. The high-hydrophobicity microporous polymeric adsorbent can be applied to treatment and recycling of organic waste gas. The invention discloses a method for preparing the high-hydrophobicity microporous polymeric adsorbent.

The invention relates to a method for furthering separating and purifying salvianolic acid from Danshen extract fluid, which comprises that prepares, breaks and extracts Danshen via water solution, acidifies extract to adjust pH and adds salt to process post-treatment, processes dynamic continuous adsorption and elution on the treated extract at chromatography column stuffed with resin adsorbent, elutes via water, collects and concentrates eluent, elutes via gradient ethanol solution, segmented collects and concentrates eluent, and dries the concentrates solution to obtain product. The invention can simply, effectively and quickly separate and purify various salvianolic acids, wherein test on different salvianolic acid products shows that the highest yields of tanshinol, alkannic acid, rosmarinic acid, salvianolic acid A and salvianolic acid B are 35. 55%, 70.65%, 99.27%, 82.78%, and 89.34%, and relative highest purities are 95.32%, 65.05%, 29.40%, 33.93%, and 82.35%, which are near or higher than the result of purification on the goal of single component.

The invention discloses a glucosylglycerol product and a purification method and application of the glucosylglycerol. The method comprises the following steps of 1, obtaining a low-permeability extract rich in GG(glucosylglycerol); 2, carrying out depigmentation treatment by adopting membrane filtration; 3, carrying out depigmentation treatment by adopting resin adsorption; 4, carrying out desalination by adopting membrane filtration; and 5, carrying out dehydration and concentration, specifically, carrying out dehydration on an obtained concentrated solution so as to obtain the purified glucosylglycerol product. The purification method has the advantages of being simple, safe, easy to operate and control, efficient, very suitable for industrial large-scale production and capable of improving the economic benefits.

The invention relates to an environment functional composite material based on inorganic functional agent of nano-particles. The invention has the structure that: (1) the composite supporter is ion-exchange and polymeric adsorbent with a nano-hole structure; (2) the internal surface of a supporter is coated with an inorganic functional agent of nano-particles. The apparent density of the environment functional composite material generally is 0.70-1.20 g / ml, and weight percent content of the inorganic functional agent is 1-40 percent, and the particle size generally is less than the hole diameter of the supporter, about 0.5-80mm, and the adsorbent particle size is 0.5-1.5mm, and with the particle size, the high pressure head loss problem caused by applying inorganic functional agent of fine particles in the flow pattern system can be overcame. The material accomplishes the stability of inorganic functional agent of nano-particles, which greatly improve the use efficiency of the inorganic functional agent, and furthermore provides a technical support for realizing deep purification and safety control of numerous trace pollutants in environment.

The invention relates to a preparation method for fruit essence. The method is processing method with natural raw materials as main materials and synthetic raw materials as auxiliary materials; the essence comprises, by weight, 12 to 43 parts of fruit perfume base, 10 to 30 parts of fruit inspissated juice, 28 to 45 parts of propylene glycol, 18 to 32 parts of high fructose corn syrup and 3 to 20parts of fruit extractive. The preparation method comprises an extraction process for the fruit extractive and mixing and dissolving of all the above-mentioned raw materials according to a desired ratio; the fruit extractive is prepared from fresh fruits through enzymatic hydrolysis, resin adsorption, solvent desorption and the like and has the advantages of clearness, transparency, rich and natural fragrance, etc.; when the fruit extractive is cooperatedly used with other raw materials, the coordination degree of aroma of an essence product can be increased, original fragrance of fruits can be embodied authentically, and therefore, traits of the product are improved, the quality of the product is enhanced and production cost is reduced.

The invention discloses a method for separating and recycling uranium, thorium and rare earth in rare earth mineral decomposition residue. The method comprises the following steps: carrying out acid leaching, carrying out pressure filtration, absorbing and recycling uranium by using anion resin, separating and recycling thorium and rare earth by suing cationic resin. The method specifically comprises the following steps: leaching rare earth mineral decomposition residue by using inorganic acid; carrying out pressure filtration on the leached slag, washing the leached slag to obtain a clear material solution, absorbing uranium element of the leached material solution by using 201*7 type resin, separating elements thorium and rare earth of an uranium-removal material by using 001*7 type resin, separating and purifying uranium, thorium and rare earth, then washing, complexing, eluting, precipitating and concentrating to obtain products comprising heavy oleate, thorium nitrate and rare earth carbonate and obtain products which comprise high-purity uranium, thorium and rare earth. The extracting and recycling process is simple in device structure, low in investment, low in energy consumption and easy to operate; the industrialization is liable to implement; the direct recovery rate is 99%; precious resources can be recycled; the waste is reduced; the environment is protected.

The invention provides a method for adsorbing glycerols contained in wastewater by using a resin treated by boric acid. The method comprises the following steps: using a macroporous anion resin to form a boric acid ion resin through boric acid treatment; placing the boric acid ion resin in a wastewater treatment device containing the glycerols; taking out the boric acid ion resin adsorbed with the glycerols when the glycerol content in outlet water of the wastewater treatment device reaches a set value; eluting a boric acid and glycerol complex adsorbed to the boric acid ion resin through acid and alkali treatment; and then continuing to use the boric acid ion resin, wherein the specific steps are as follows: (1), pretreatment of the adsorbing resin, (2), modification of the adsorbing resin, (3), adsorption of the glycerols in the wastewater, and (4), desorption of the boric acid and glycerol complex adsorbed to the boric acid ion resin; and the treated resin can be recycled. On the basis of a principle that the boric acid can react with the glycerols, the invention provides the novel method for adsorbing the glycerols in the wastewater; therefore, the wastewater containing the glycerols can be effectively treated and purposes of saving resources and protecting the environment are achieved.

The invention relates to a method for extracting anthocyanin from a cowberry. The method comprises the following steps: 1, crushing the cowberry, 2, extracting the cowberry, 3, filtering the obtained material, and 4, purifying resin: I) controlling the temperature of the operation process to less than or equal to 60 DEG C; II) adsorbing a film filtering liquid finally obtained in step 3 to saturate by resin; III) washing the resin adsorbed to saturate by water; and removing impurities from the resin until washing water shows colorless; IV) desorbing the macroporous absorbent resin by 30 to 50 percent ethanol or methanol, and collecting an effluent liquid; and V) concentrating and drying the effluent liquid to obtain the anthocyanin. The method has the advantages of easy operation, low cost and high extraction content.

The invention provides a method for oriented biosynthesis of GAMG, and belongs to the technical fields of biosynthesis and biotransformation. The method comprises the following steps: producing corresponding beta-D-glucuronidase by penicillium purpurogenum stoll in a fermentation medium; adding the obtained beta-D-glucuronidase into conversion solution containing glycyrrhizic acid substrate, orientedly hydrolyzing the glycyrrhizic acid under the action of enzyme, and obtaining a coarse product of GAMG; and performing organic solvent extraction, resin adsorption and purification to obtain a GAMG product. The method takes microbialenzyme as a catalyst, and has high reaction efficiency, no pollution, simple steps, and low cost; and the product is single and has high purity.

The invention belongs to the field of medical technology and discloses a new preparation technique of schizandrol B and schizandrol A in schisandra chinensis baill leaves. The technique comprises the steps: schisandra chinensis baill leaves are taken as raw material, ground and then processed by one or more technique(s) in solvent extraction method, organic solvent extraction method, resin adsorption method, normal phase column chromatography, reversed-phase column chromatography and the like, namely, the schisandra chinensis baill leaves are taken as raw material, extracting solution containing the schizandrol A and the schizandrol B is extracted by organic solvent; after extract is processed by repeated column chromatographic separation, the flowing parts containing the schizandrol A and the schizandrol B are collected, and the schizandrol A and the schizandrol B are obtained after repeated recrystallization of the condensate; the purities of the schizandrol A and the schizandrol B can be more than 98% by HPLC detection. The preparation method has simple technique, stable purity and good reproduction quality, can be used for replacing shizandra fruit to extract and prepare standard product, fully utilizes the resource of shizandra and relieve the situation that the supply of the shizandra fruit is not adequate to the demand.

The invention relates to a method for purifying high-purity organic solvent acetonitrile for research, including the steps as below: acetonitrile which is used as a raw material reacts with solid alkali at low temperature so as to eliminate unsaturated nitrile; impurities absorbed by high waveband ultraviolet are removed by the adsorption of zeolite and polymeric adsorbent; and a 3A molecular sieve is used for drying and dehydration, and the operations of rectification, filtration and encapsulation are carried out to obtain the product of chromatographic grade, pesticide residue grade and gradient elution grade chromatographic acetonitrile. By the method, the product of chromatographic pure acetonitrile with purity of more than 99.9 percent can be obtained, and can meet the requirement of the pesticide residue grade and gradient elution grade chromatographic acetonitrile, thereby meeting the demand of customers on application of high efficiency liquid chromatography (HPLC) in pesticide residues, filling in the gap of domestic preparation of pesticide residue grade and gradient elution grade chromatographic reagents, reducing the dependency on abroad reagents, and providing the qualified reagents for the inspection of the pesticide residues and the separation and the nature determination of complex medicines.

A composition includes Mogroside V and a Rebaudioside component in a weight ratio ≧1:1 and ≦6:1, wherein the Rebaudioside component consists of one or more compounds selected from the group consisting of Rebaudioside A, Rebaudioside B and Rebaudioside D. A method of purifying a Luo Han Guo extract includes contacting the Luo Han Guo extract with activated carbon and a macroporous polymeric adsorbent resin, an ion exchange resin, or both. A composition includes a Luo Han Guo extract, wherein Mogroside V constitutes from 50 wt % to 75 wt % of the Luo Han Guo extract and the composition includes from 0 to 13 wt % in total relative to the Mogroside V of aromatic glycosides, and from 0 to 15 ppm of semi-volatile organic compounds relative to the Mogroside V.

The invention discloses a method for extracting a maslinic acid and oleanolic acid containing mixture from olea europaea L. pomace. The method comprises the following steps of: extracting an extract from the olea europaea L. pomace in an 80-95wt% (weight percent) ethanol aqueous solution, concentrating the extract, redissolving the extract in a 20-70wt% ethanol aqueous solution, adsorbing by using a macroporous adsorption resin, removing water-soluble impurities by using a water-washing resin column, desorbing by using a desorbing solution, mixing the desorbing solution, recovering the desorbing solution, and drying to obtain a maslinic acid and oleanolic acid containing extract. The mixture extracted from the olea europaea L. pomace contains more than 30% of maslinic acid and more than 23% of oleanolic acid.

The invention belongs to the technical field of medicaments, and provides a method for preparing total triterpene of Chinese medicament garden burnet root. The total triterpene is mainly obtained by performing reflux extraction by 70 percent ethanol, absorbing by a macroporous absorbent resin, using water to wash off impurities, using ethanol solution for elution, then decolorizing an eluent by daiamid powder, using the ethanol solution for elution, and recovering the ethanol through pressure reduction. The total triterpene mainly contains triterpenic acid active components such as arjunic acid, 1beta-euscaphic acid, euscaphic acid, tormentic acid and the like, and triterpenoid saponin active components such as sanguisorbin I, sanguisorbin II, sanguisorbin III, niga-ichigoside, kaji-ichigoside F1 and the like. Experimental results show that the total triterpene has remarkable anti-inflammatory and analgesic effects. The total triterpene has definite action substance basis and action mechanism as well as simple preparation technology, is suitable for industrialized production, can be taken as medicinal raw materials for treating inflammatory diseases such as burn and scald, rectitis, ulcerative colitis, pyelonephritis and the like, and is prepared into clinically acceptable dosage forms such as tablets, capsules, granules or compound preparations according to the prior process.

Relating to the resin adsorbent preparation field, the invention discloses a preparation method for a resin adsorbent compounded with straw activated carbon. The method includes: (1) preparation of straw activated carbon; (2) preparation of straw activated carbon immobilized microbial granules; (3) preparation of an acrylate copolymer emulsion; and (4) preparation of the resin adsorbent compounded with straw activated carbon. The method provided by the invention is in favor of preparation of straw activated carbon from straw stalk, effectively utilizes waste materials and is low in cost. In addition, the resin adsorbent prepared by the method provided by the invention has fast oil absorption speed and large oil absorption capacity, and can carry out microbial degradation on the adsorbed oil, so that the resin adsorbent can effectively remove oil stain from water body for a long time. Also, the activated carbon-polyvinyl alcohol-sodium alginate system is taken as the first carrier and resin is adopted as the second carrier, thus making up the disadvantages of poor mechanical properties and low strain activity of the first carrier.

The invention discloses a classification extraction method for fulvic acid subfractions in water. The classification extraction method comprises the following steps that a, a water sample is acidized and filtered; b, resin adsorption is carried out on water fulvic acid; c, classification leaching is carried out on the fulvic acid subfractions; d, the fulvic acid subfractions are purified; e, the water fulvic acid subfractions are desalted and cured. In this way, a fulvic acid solution can be extracted from the water, and after the fulvic acid subfractions are classified and cured based on the resin separation technology, finally the classified solid fulvic acid subfractions are obtained.