403results about How to "Simple operating conditions" patented technology

The invention relates to a method for comprehensively using aluminium to electrolyze a waste cathode carbon block, which belongs to the technical field of environment protection and comprises the following steps: crushing and grinding the waste cathode carbon block; adjusting the concentration and the PH value of ore slurry after the grinding, then using floatation equipment to carry out floatation treatment, and separating electrolyte and carbon which are contained in the waste cathode carbon block; using an aluminium salt solution to soak for extracting the electrolyte contained in a carbon product obtained from the floatation, and further improving the grade of a high-carbon product; mixing the grinding waste water, the floatation waste water and the soaking solution, and adding CaO and CaCl2 to precipitate and recover aluminium and fluothane in the mixture. The method for comprehensively using aluminium to electrolyze a waste cathode carbon block has simple operating condition, low energy consumption, high recovery ratio of valuable substances and good application prospect.

The hydrophobic SiO2 aerogel preparing process is one normal pressure one-step process. The preparation process includes mixing methyl trialkoxyl silane, lower alcohol, water and silicon sol in the volume ratio of 0.5-4 to 2-16 to 1-8 to 1 inside one sealed container; regulating pH value to 4-6, stirring 1-6 hr and letting stand at room temperature for 2-6 hr; regulating pH value to 7-10, sealing, letting stand inside stove at 30-60 deg.c for 4-42 hr to prepare cross-linked SiO2 mixed alcohol gel; ageing for 24 hr, soaking with alcohol or acetone for three times of 4 hr each; and finally stoving inside a stove at 60-80 deg.c for 12-36 hr to prepare the hydrophobic SiO2 aerogel. The prepared hydrophobic SiO2 aerogel has excellent performance: density of 100-600 kg / cu m, specific surface area of 340.06-436.86 sq m / g and water contact angle of 127-141 deg.

The invention discloses a preparation method of silica aerogel, and belongs to the field of preparation of inorganic porous materials. The preparation method includes: allowing alkaline silica sol to form aerogel directly under the action of acid catalyst and base catalyst; performing solvent displacement and surface silylanizing; and supercritical or atmospheric drying to obtain SiO2 aerogel. Organic solvents are not used in sol formation, and accordingly dangers in sol formation are eliminated. The complex process of sol preparation by organosilicone and desalination by sodium silicate is omitted from the aerogel preparation, the alkaline silica sol low in cost and stable in performance is used as raw material, process is simple, production cycle is short, reaction process is controllable, equipment requirements and investment are low, and industrial production of SiO2 aerogel is achieved.

The invention relates to a reinforced nanofiber porous membrane and a preparation method thereof. The porous membrane is a two-component lithium ion battery diaphragm formed by compounding polymer resin with polyurethane, and has a semi-interpenetrating network structure, the porosity of 60 to 80 percent, and mechanical property which is 3 to 4 times higher than that of a polymer resin single-component porous membrane. The preparation method comprises the following steps of: preparing a polymer resin non-woven membrane by high-voltage electrostatic spinning, impregnating the non-woven membrane in solution of wet curing reaction polyurethane prepolymer with a high-reactivity isocyanate group, reacting -NCO in the polyurethane prepolymer with a -OH bond of water in air at room temperature to obtain the polyurethane through crosslinking and autopolymerization, so that nanofibers in the non-woven membrane are bonded to form a polymer resin and polyurethane two-component composite membrane, and the mechanical strength of the fiber membrane is greatly improved. The method is easy to operate, and the prepared non-woven membrane keeps the advantages of high porosity of a membrane prepared by an electrostatic spinning technology, and heat stability of the polymer resin, and has high ion permeability and affinity of electrolyte.

The invention discloses a functionalized graphene adsorbent and a preparation method and application of the functionalized graphene adsorbent. The adsorbent is mainly composed of grapheme and cetyl trimethyl ammonium bromide. The cetyl trimethyl ammonium bromide inserts into the edge or surface layer of the layered grapheme and or embeds into the edge or surface layer of the layered grapheme through the function of non-covalent bond. The mass fraction of the cetyl trimethyl ammonium bromide in the adsorbent is 40%-50%. The invention discloses the preparation method of the functionalized graphene adsorbent. The method comprises the steps of dispersing the graphene oxide into the water, adding cetyl trimethyl ammonium bromide to the dispersed suspension liquid and stirring to make reaction, then adding suspension liquid to the heated reaction system and conducting suction filtration, washing and drying to the black cotton-shaped precipitate obtained by reduction. The functionalized graphene adsorbent can wipe out the chrome in the waste. The adsorbent is added into the chromate waste water, control the temperature of the waste, then after the full adsorption and complete oscillatory removal of the chromate is completed. The functionalized graphene adsorbent and a preparation method and application of the functionalized graphene adsorbent has the advantages of being simple, high efficient, green, economical and environmental and the like.

The invention discloses a compound grapheme absorption agent which comprises grapheme, nanometer zero-valent iron and cetyl trimethyl ammonium bromide. The invention further discloses a method for preparing the compound grapheme absorption agent. The method for preparing the compound grapheme absorption agent includes the following steps that firstly, oxidized grapheme is dispersed in water with ultrasonic waves and oxidized grapheme suspension liquid is obtained; secondly, the nanometer zero-valent iron and the cetyl trimethyl ammonium bromide are added into the oxidized grapheme suspension liquid obtained in the first step, fully stirred and fully reacted and a reaction solution is obtained; thirdly, the reaction solution obtained in the second step is added with reductive agents and fully reacted and black flocks are obtained; fourthly, the black flocks obtained in the third step are filtered, washed and dried to obtain the compound grapheme absorption agent. The compound grapheme absorption agent is efficient, green, economic, friendly to environment, and suitable for large-scale production. The preparing method is simple and conditions are easy to control.

The present invention relates to a polymerizable macromolecule photoinitiator and a preparation method thereof. The preparation method comprises: adding 4-hydroxybenzophenone and a formaldehyde solution to a three-necked flask filled with an alkali adopted as a catalyst, carrying out heating stirring to a temperature of 95 DEG C, and carrying out a reaction for 2 hours; heating to a temperature of 150 DEG C, carrying out a reaction, and carrying out a reduced pressure suction filtration reaction for 20 minutes; cooling to a temperature of 105 DEG C after completing the reaction, and collecting the product; pouring the product into water to carry out precipitation, and carrying out suction filtration to obtain a benzophenone-containing macromolecule photoinitiator; dissolving the benzophenone-containing macromolecule photoinitiator in an organic solvent, and simultaneously adding the benzophenone-containing macromolecule photoinitiator and a tertiary amine to the three-necked flask to carry out stirring; dissolving acryloyl chloride in an organic solvent, and slowly adding the organic solvent containing the acryloyl chloride to the mixing solution in a dropwise manner, wherein thereaction temperature is 0-5 DEG C; after completing the addition, stirring for 3 hours at a room temperature, and standing overnight; carrying out suction filtration, washing and drying on the resulting solution; and carrying out rotary evaporation to remove the solvent to obtain the polymerizable macromolecule photoinitiator. The photoinitiator prepared by the preparation method of the present invention has characteristics of large molecular weight, relatively small mobility, self-polymerization, and the like.

The invention relates to a method for improving acid production quality and acetic acid proportion in anaerobic fermentation of residue active sludge. The method comprises the following steps of firstly, adding calcium peroxide into concentrated residual sludge in a wastewater treatment plant, wherein adding amount of the calcium peroxide is 5%-20% of the weight of the volatile suspended solid in the residual active sludge; then, sealing at 30-40 DEG C, carrying out anaerobic digestion in an anaerobic digestion tank with stirring speed of 100-200rpm, wherein the anaerobic digestion time is 5-10 days. The result indicates that calcium peroxide can promote dissolution of particulate organic substances, can improve acidification degree of deliquescent organic substances and can inhibit a methane production process, so that accumulation of volatile short-chain fatty acid is facilitated and transformation of other acids to acetic acid is promoted; meanwhile, a plurality of harmful organic substances in the sludge are effectively removed, so that the acid production quality in anaerobic fermentation of the residue active sludge is improved. The method disclosed by the invention is simple to operate and gentle in reaction condition, is used for recycling and carrying out harmless disposal on the concentrated residual sludge of the sewage treatment plant, and has very good economic and social benefits.

The invention relates to a main transformer differential protection CT polarity check method of a pumped storage power station. In the invention, an applied power method is adopted to solve the problem that the main transformer differential, bus differential and high-voltage cable differential protection CT polarity cannot be checked during the inversed electrification of a main transformer before the machine set of the power station is started, thereby the safety and reliability of the system and the inversed electrification of the main transformer are ensured. The method has the advantages that the operation and the using condition are simple, the used test instrument equipment can be used repeatedly, the water debugging straight-line period of the machine set is not occupied, the temporary high-voltage cable investment is saved, and the commissioning cost is reduced; therefore, the method has favorable popularization and application prospect.

The invention relates to a reality bi-directional identification method, including following steps that: (1) a reality(A) sends a message(1) to a reality(B); (2) the reality(B) sends a message(2) to a credible third party(TP) after receiving the message(1); (3) the credible third party(TP) checks the legality of the reality(A) and the reality(B) after receiving the message(2); (4) the credible third party(TP) sends back a message(3) to the reality(B) after checking the legality of the reality(A) and the reality(B); (5) the reality(B) verifies the message(3) after receiving the message(3); (6) the reality(B) sends a message(4) to the reality(A) after the reality(B) verifies the message(3); (7) the reality(A) verifies the message(4) after receiving the message(4); as a result, the identification is completed; compared with the conventional identification mechanism, the invention has the advantages of defining an on-line retrieval and identification mechanism of a public key, realizing the centralized management of the mechanism, simplifying the operating condition of the protocol and facilitating the application and implement of the public key.

The invention discloses a method for preparing superfine calcium carbonate compound particles, which comprises the following steps of: (1) introducing carbon dioxide gas or carbon dioxide-containing gas in suspension of calcium hydroxide, and reacting to obtain slurry containing superfine calcium carbonate particles; (2) when the pH value is reduced to be between 7.1 and 10.5, adding soluble aqueous solution of silicate, so that the pH value in a reaction system is between 7.5 to 9.5, after adding the silicate, stopping introducing the carbon dioxide-containing gas, aging at the temperature of between 40 and 90 DEG C for 0.5 to 3 hours, and introducing the carbon dioxide-containing gas until the pH value is between 6.5 to 7.0; and (3) filtering the obtained serous fluid, and washing by water to obtain the products. By the method, silicon dioxide can be subjected to film-forming cladding on the surface of calcium carbonate uniformly; and the method is simple in operating conditions, and the prepared calcium carbonate compound particles have the advantages of compact structures, high acid-resisting capacity, high dispersibility and low cost.

An entity bidirectional authentication method and system, the method involves: the first entity sends the first message; the second entity sends the second message to the credible third party after receiving the said first message; the said credible third party returns the third message after receiving the second message; the said second entity sends the fourth message after receiving the third message and verifying it; the said first entity receives the said fourth message and verifies it, completes the authentication. Compared with the conventional authentication mechanism, the invention defines an on-line retrieval and authentication mechanism of a public key, realizes the centralized management for it, simplifies the operating condition of the protocol, and facilitates the application and implement.

The present invention relates to the process of preparing micron level SiO2 aerogel ball as the stuffing of chromatographic column for separating biological macromolecule. The process includes the following steps: preparing alcohol sol of SiO2 via mixing silicon gel and nitric acid in the volume ratio of 1 to 0.5-20, and adding anhydrous ethanol; mixing n-heptane, span-80, Tween-85 and n-butanol in certain volume proportion through stirring to obtain oil phase; adding the sol of SiO2 into the oil phase in certain volume ratio to form W / O emulsion; stirring, adding concentrated ammonia water to alkaline for depositing gel, further stirring, and liquid-solid separation to obtain SiO2 gel microballoon; washing with acetone and drying to obtain micron level SiO2 aerogel ball. The process has normal pressure, easy control, low cost, and other advantages.

The present invention relates to the technical field of a zeolite molecular sieve synthesis, concretely speaking, relating to a preparation method of a zeolite molecular sieve of a nano heteroatom. A sodium silicate or a soluble glass, an inorganic acid, an inorganic ferric salt, an organic amine and deionized water serve as the material. After the steps of liquor preparation, two variable temperature crystallizations, washing-up centrifugalization, drying and roasting, the zeolite molecular sieve of nano Fe-ZSM-5 is produced with a grain size less than 100nm. The present invention can be used in the petrochemical industry, fine chemical industry and the environmental protection field.

The present invention relates to the preparation process of phloroglucinol superior to available preparation process. The present invention features that the preparation process of phloroglucinol includes the complexing reaction between anhydrous aluminum trichloride as complaxing agent and 1, 3, 5-trimethoxy benzene, hydrolysis in concentrated hydrochloric acid solution, cooling and crystallization of hydrolysate to obtain coarse phloroglucinol product, decolorizing with active carbon and re-crystallization in water to obtain refined phloroglucinol product. The said preparation process of the present invention has phloroglucinol product with good color and high purity, short reaction time, less waste liquid exhaust, simple operation condition and high reaction stability.

From a viewpoint of reduction in an out of spec product after surface crosslinking, particularly, when an alkylene carbonate compound is used as a surface crosslinking agent, influence by an air temperature is great, and it is necessary to reduce ethylene glycol which is produced as a byproduct, and there is provided a process for producing a polyacrylic acid (salt)-based water absorbent resin powder, comprisinga step of polymerizing an aqueous acrylic acid (salt)-based monomer solution,a step of drying the resulting polymer,an optional grinding•classifying step, anda surface crosslinking step,wherein in the surface crosslinking step,(1) a surface crosslinking agent containing an alkylene carbonate compound and a polyhydric alcohol compound is mixed into a water absorbent resin powder, the mixture is heat-reacted and, further, simultaneously with, or separately from the mixing, an ion reactive surface crosslinking agent is mixed, and / or(2) mixing treatment of mixing a surface crosslinking agent solution into a water absorbent resin powder containing at least one or more kinds of ion reactive surface crosslinking agents is performed two or more times.

The invention relates to a method for refining a thiofide 2-mercaptobenzothiazole (M). The method is characterized in that an extraction method and an alkali dissolving and acid isolation method are creatively combined. The method comprises the following steps: crude thiofide M is extracted by using toluene for three times to remove resin impurities so as to obtain high-purity thiofide M; the thiofide M in the resin is purified by the alkali dissolving and acid isolation method; and the thiofideoluene is reclaimed by a distillation method. By adopting the processing, the thiofide M with high purity, high melting point and short melting period can be obtained.

The invention relates to an MCM-22 zeolite molecular sieve containing rare earth heteroatoms in a skeleton and a hydrothermal synthesis method thereof. The method is characterized by comprising the following steps: regulating the pH value of the mixed solution of a silicon source and a rear earth source to perform co-hydrolysis and obtain a silicone gel precursor containing rear earth; then adding an organic template agent to obtain a solution A; mixing water, an aluminum source and an alkali source uniformly according to a certain proportion to obtain a solution B; slowly adding the solution B in the solution A dropwise to obtain a crystallization liquid; and placing the crystallization liquid in a hydrothermal kettle, sealing and performing the static hydrothermal crystallation for 5-30 days at 140-180 DEG C to obtain the skeleton rare-earth heteroatom molecular sieve MCM-22 with the MCM-22 crystal structure. The method avoids the phenomenon that only rare-earth heteroatoms are hydrolyzed to generate oxide precipitate; the crystallization process uses the static method without the stirring step, thereby simplifying the operating condition and reducing the production difficulty. In addition, the product has high crystallization degree and high hydrothermal stability and the preparation method has good repeatability.

The invention belongs to the field of the environmental pollution control method and specifically relates to a method for removing heavy metal ions out of water. The method comprises the steps of mixing penicillium simplicissimum spores and a heavy metal ion solution to obtain a mixed solution, next, adding charcoal dust to the mixed solution, and then carrying out culturing and separation processes, thus completing the adsorption and removal of heavy metal ions out of the water. The method is characterized in that an immobilized object and an immobilization carrier are exchanged, the penicillium simplicissimum mycelia are taken as the carrier to immobilize the charcoal dust, the reducing adsorption action of the charcoal and the penicillium simplicissimum on hexavalent chromium (Cr<6+>) in water and the adsorption effect of the charcoal and the penicillium simplicissimum on heavy metal ions such as cadmium (Cd<2+>), lead (Pb<2+>) and copper (Cu<2+>) in water are achieved simultaneously, and therefore, charcoal dust with the heavy metal ions is easy to separate; the method is simple in operation condition, easy to implement, low in cost and high in removal rate, and does not cause secondary pollution.

The invention discloses a method for processing heavy metal Cd contaminated soil, which is characterized by comprising the steps of adding rhamnolipid aqueous solution with concentration of 0.5-2g / L into a negative electrolytic tank, adding deionized water into a positive electrolytic tank, installing a filter cloth between the Cd contaminated soil needed to process and the negative electrolytic tank as well as the positive electrolytic tank, installing a permeable reaction wall on an enrichment place of the heavy metal Cd far away from five eighth of an anode S3, and switching on to electronically repair the Cd contaminated soil. The Cd concentration rate is above 4 times higher than an initial value; and under the function, the concentration rate is reduced to about 3.63 times, the total removal ratio of the heavy value Cd of the whole soil is about 40%, and the contribution ratio of the permeable reaction wall on the removal ratio is about 90%, so that the alkaline rhamnolipid solution proves that the process of the heavy metal from enrichment to removal can be realized by the electrical repair and the permeable reaction wall. The method is simple in operation condition, wide in range of application, low in cost, high in efficiency, liable to realize, and has the better social benefit and biological benefit on the heavy metal Cd contaminated soil.

The invention discloses a production method of calcium peroxide particles for slowly releasing oxygen. The production method of the calcium peroxide particles for slowly releasing the oxygen comprisesthe steps of using calcium peroxide powder as an oxygen releasing agent, using polylactic acid particles as an embedding medium, using dichloromethane as an intermediate medium for dissolving the polylactic acid particles, after the dissolved polylactic acid particles and the calcium peroxide powder are completely mixed, conducting volatilizing under a ventilation condition to remove the dichloromethane, placing an obtained mixture in a tubular mold after the mixture is in a gelatinous semi-solid state, and conducting extrusion molding and shearing balling to finally obtain the calcium peroxide particles for slowly releasing the oxygen after the dichloromethane is completely volatilized. By means of the production method of the calcium peroxide particles for slowly releasing the oxygen, the calcium peroxide powder and the polylactic acid particles can be completely mixed and embedded, the oxygen release speed of the calcium peroxide in water can be effectively controlled, and in the production process, loss, due to contact between the calcium peroxide and the water, of an oxygen releasing component is avoided. The produced calcium peroxide particles for slowly releasing the oxygencan slowly and continuously release the oxygen in the water, and meanwhile, due to the biodegradability of the PLA, no secondary pollution is generated during material use.

This invention is preparation procedure of the yolk antibody of high biological activity, belonging to the field of bioproduct and industrialized isolation technique. In this invention, we adopt the natural macromolecule gel high -extractive technique and hyperfiltration to extract the yolk-antibody of high biological activity from yolk at an industrialized level, annual output is upto 10 ton. the yolk-antibody content is about 30%-50%, meanwhile we could obtain some by-products like albumen powder, yolk powder, egg oil, vitellin and so on. In the invention high technology like bioimmunology and membrane separation is adopted. The invention is high-tech, high-usage, highly-automated and typical of green food and environmental-friendly.

The invention provides a method for preparing high-gelation protein powder combining chemical methods including a Maillard reaction, a fermentation sugar removal method and physical methods such as microwave radiation, dry heat-treating, etc. The prepared high-gelation protein powder has ultrahigh protein powder gel strength and stability with a highest up to2,400g and wide application.

The present invention is normal pressure zinc vapor oxidizing process for preparing four-needle zinc oxide whisker. Under normal pressure, metal zinc ingot, industrial coarse zinc product, zinc alloy, zinc containing waste, etc as material is heated directly to produce zinc vapor, or zinc vapor generated during smelting is used as the material, and the zinc vapor is oxidized via contacting with air or oxygen to produce four-needle zinc oxide whisker. The production process can obtain high quality four-needle zinc oxide whisker in the identical shape, and the production process is simple and may be continuous. The prepared four-needle zinc oxide whisker may be used in polymer material, antistatic material, antiwear and antiskid material, etc.

The invention discloses a method for preparing silicon dioxide aerogel by using acidic silica sol and belongs to the field of preparation of inorganic heat-insulating materials. The method comprises the following steps of: directly forming gel under actions of acid and alkali catalysts by using acidic silica sol as a raw material, wherein the process for preparing the gel does not involve organic solvent so as to improve the security of production; and preparing SiO2 aerogel through supercritical or constant pressure drying after the gel is subjected to solvent replacement and surface silylation. According to the method, the process for preparing the sol by using organic silicon as raw material and a complicated process for removing salt in water glass are avoided; and because the acidic silica sol with low cost and stable performance is used as the raw material, the method has the advantages that the process is simple, the production cycle is short, the reaction process is controlled, and the requirement and investment of the equipment are low, so that the industrial production of SiO2 aerogel can be realized.

The invention relates to a preparation method of porous perfluorinated sulfonic acid resin for catalysts, wherein the preparation method comprises that perfluoro(sulfonyl vinyl)ether and tetrafluoroethylene are polymerized under the condition of co-existence of a solvent, a pore-forming agent and an initiating agent to obtain the product, the perfluorinated sulfonic acid resin having low equivalent weight and low molecular weight is used as the pore-forming agent, the solvent is recycled by a way of adding deionized water and a dispersant and carrying out distillation, at the same time, the resin is molded, after further drying, a granular material is obtained, and moreover, a mixture of one or more of perfluorinated hydrocarbon / perfluorinated cyclic ether / chlorofluorocarbon are used as an extraction agent for extracting the pore-forming agent so as to form a porous structure. The method has simple operating conditions, has no need for high temperature and high pressure, and solves the problem in the prior art that effective catalytic component loss is difficult to overcome during a using process, and the service life of the catalyst is increased; and at the same time, due to the existence of the porous structure, the specific surface area is increased, and the active component utilization rate is improved.

The invnetion discloses a attapulgite gasoline desulfurizer composed by attapulgite clay, iorn oxide, alumina, copper oxide and zinc oxide. The preparing method includes steps: mixing dosages of the attapulgite gasoline desulfurizer, adding nitrate acid for acid-curing, extruding and airing, crushing and sieving, baking and packaging as products. After gasoline contacted sufficiently with the attapulgite gasoline desulfurizer, sulfuret of gasoline absorbed on particles thereof to reduce sulfuret content of gasoline; iorn oxide, alumina, copper oxide and zinc oxide is generated as nitrate after nitrate acid-curing and created chemical reaction with sulfuret of gasoline to further reduce sulfuret content of gasoline. The attapulgite gasoline desulfurizer is suit for desulfuration process of gasoline, diesel oil and aviation kerosene.

The invention discloses a synergistic agent for a flue gas desulfurization process adopting a wet limestone-gypsum method and application thereof, and belongs to the technical field of flue gas SO2 control directly applied to atmospheric environment protection. The synergistic agent is sodium pyroborate or hydrate thereof. The synergistic agent can be applied according to the following mode: the sodium pyroborate (molecular formula Na2B4O7) or hydrate thereof is dissolved in water to obtain a synergistic agent suspension; and the synergistic agent suspension is added in a desulfurization absorber liquid holding groove, wherein in the desulfurization absorber liquid holding groove, the synergistic agent suspension is added in the sodium pyroborate with the amount-of-substance concentrationof 1.46*10<-4>-7.29*10<-3>mol.L<-1>. According to the synergistic agent provided by the invention, the desulfurization efficiency can be remarkably improved on the premise of not changing a traditional desulfurization system.

The invention provides a method and device for pretreating high-concentration wastewater through ultraviolet-ozone co-oxidation. The method comprises the steps that high-concentration wastewater in a raw water tank and ozone are mixed to obtain milk white effluent water with ozone microbubbles, the milk white effluent water flows into a reaction tank provided with a vertical partition board, the vertical partition board divides the reaction tank into a water inlet side and a water outlet side, sulfuric acid and hydrogen peroxide are added into the water inlet side of the reaction tank, and organic pollutants are degraded under the joint action of the ozone and the hydrogen peroxide; one part of effluent water from the lower portion of the water outlet side of the reaction tank cyclically flows to the raw water tank to be subjected to another reaction, the other part of effluent water flows into an intensified reactor to be subjected to a photochemical reaction, the organic pollutants are degraded through synergistic effect of the effluent water subjected to the photochemical reaction and ozone produced subsequently, and the effluent water returns to the water inlet side of the reaction tank for a continuous reaction; produced water overflows into a produced water tank from the upper portion of the water outlet side of the reaction tank,and the subsequent biochemical treatment process is conducted after the pH value of the produced water is adjusted to range from 6 to 9. By means of the method, the treatment efficiency is high, and the treatment effect is good; the device can operate stably and is less in investment and low in operating cost.

The invention relates to the technique of natural edible pigment in the food additives, which in detail a method for producing natural chestnut shell brown pigment, breaking the chestnut shell, extracting with base solvent after removing the flocculus, filtering the extracting fluid, condensing the filtering fluid, depositing, separating, drying and getting the natural chestnut brown pigment. The invention is characterized by the high productivity, good product quality, strong stability, simple process, low cost, changing the disposal to useful things, which opens a new way of producing natural brown pigment for food industry and at the same the industrialized production of the pigment contributes a lot for protecting ecological environment and increasing social benefit.