34results about How to "Low acid value" patented technology

The invention belongs to the technical field of grease chemistry, and particularly relates to diglyceride prepared through enzymolysis and used for reducing blood fat, a preparation method and application of the diglyceride. The preparation method comprises the following steps: (1) mixing edible oil, lipase and water, hydrolyzing and dehydrating to obtain a hydrolysate; and (2) mixing the hydrolysate, glycerol and partial glyceride lipase, reacting, and distilling to obtain the diglyceride, the partial glyceride lipase in the step (2) is a mixture of lipase Lipase G50 and lipase Novozyme 435. The diglyceride prepared by the method disclosed by the invention has an excellent effect of reducing blood fat; and the obtained diglyceride is high in yield and low in acid value, and the finished product does not need deacidification treatment, so that the method is suitable for large-scale industrial production.

The invention provides a low-pressure hydroisomerization / cracking process for preparing bio-based aviation fuel, and relates to the technical field of biomass energy. A three-stage hydrogenation process is adopted, a low-temperature and low-pressure homogeneous hydrogenation method combining an oil soluble catalyst with a suspended bed reactor A and a suspended bed reactor B is adopted in the front stage of step (1) and step (2), low-cost hydrogenation upgrading pretreatment is conducted on high-silicon and high-metal biomass inferior grease, deep fixed bed hydrofining is conducted in the middle stage of step (1) and step (2), and high-silicon and high-metal biomass inferior grease is obtained. In order to improve the yield of light oil products, a rear-section fixed bed hydroisomerization reactor is additionally arranged to carry out isomerization / cracking processing on heavy components.

The invention provides a succinic acid composition as well as polyester and a polyester composite material prepared from the succinic acid composition. The succinic acid composition comprises succinic acid, a compound containing sulfate radicals and a phosphorus compound, the mass content of sulfate radicals in the succinic acid composition is 240 to 500 ppm; the mass content of the phosphorus element in the succinic acid composition is 0.5 to 40 ppm. According to the present invention, by compounding the sulfate radical-containing compound and the phosphorus compound with the specific content, the polyester is prepared by using the succinic acid composition as the raw material, such that the production efficiency of the polyester can be ensured, the polyester with characteristics of low acid value and high viscosity can be obtained, and the corrosion of the polyester or the composition thereof on the metal equipment can be reduced during the polyester composite material extrusion process; the quality of the polyester composite material is ensured.

The invention discloses high-crystallinity copolyester based on furandicarboxylic acid as well as a preparation method and application of the high-crystallinity copolyester. The structural formula of the high-crystallinity copolyester is as follows: # imgabs0 # R1 is-O (CH2) aO-, R2 is-O (CH2) bO-, a, b, x, y, z and n are integers, a = 2-6, b = 6-12, x = 1-10, y = 1-10, z = 1-10, and n = 20-100; and (x + z): y = 1: 1-1: 10. The present invention also provides a highly crystalline copolyester article made from the highly crystalline copolyester. The high-crystallinity copolyester disclosed by the invention not only has excellent crystallization capacity, relatively high crystallinity, excellent thermal stability and mechanical property, but also has excellent barrier property, and has obvious advantages in various gas barrier aspects compared with PET (Polyethylene Terephthalate) on the market; the material can be widely applied to the fields of high-temperature-resistant materials, express packages, food packages, food tableware and the like.

The present application relates to a kind of biodegradable hydraulic oil composition and its preparation method, it includes the following weight parts of component: biodegradable base oil 96.0-98.5 parts and composite detergent 1.5-2.5 parts;The base oil is the mixture of pentaerythritol tetraester and trimethylolpropane triester, fatty acid chain is C8-C10 saturated fatty acid, saturation ≥90%, 28 days biodegradability meets the determination of OECD 301B;The composite detergent includes: octylated diphenylamine 0.45-0.90 parts, 2,6-di-tert-butyl-4-methylphenol 0.10-0.25 parts, 2-ethylhexyl acidic phosphate and its ethanolamine salt 0.60-1.20 parts, dodecenyl succinic acid di (2-ethylhexyl ester) 0.15-0.35 parts, and the mass ratio of octylated diphenylamine and 2,6-di-tert-butyl-4-methylphenol is 1.5:1~4:1.

The invention provides a bio-based succinic acid composition as well as a preparation method and application thereof. The bio-based succinic acid composition comprises bio-based succinic acid and a readily oxidizable substance, the content of readily oxidizable substances in the bio-based succinic acid composition is less than or equal to 0.32 mL / g. The bio-based succinic acid composition is long in shelf life, small in b value change after aging and good in aging stability; and the polyester prepared from the bio-based succinic acid composition is lower in acid value, whiter in color and higher in molecular weight.

The invention discloses a method for preparing distillation-free biodiesel from low-acid-value waste oil and fat, which comprises the following steps of: degumming the low-acid-value waste oil and fat, removing metal ions, and dehydrating for the first time to obtain pretreated oil and fat; carrying out subcritical ester exchange reaction on the pretreated grease and methanol to obtain crude fatty acid methyl ester; and carrying out dealcoholization, alkali washing, water washing and secondary dehydration on the crude fatty acid methyl ester to obtain the distillation-free biodiesel. The method is simple, energy consumption is low, no extra catalyst needs to be added, the content of fatty acid methyl ester in the prepared biodiesel is 96.5% or above, and the yield can reach 99% or above.

The invention provides a post-treatment method of neopentyl glycol reaction liquid, which comprises the following steps: (1) sequentially removing water and light components from the neopentyl glycol reaction liquid to obtain crude neopentyl glycol; and (2) carrying out hydrogenation reaction on the crude neopentyl glycol to obtain a neopentyl glycol product. According to the invention, membrane separation and hydrogenation are adopted to replace original rectification thermal separation, so that the energy consumption of the device can be obviously reduced. And heavy components can be converted into neopentyl glycol by means of hydrogenation, so that the material consumption of the device can be reduced. Meanwhile, the acid value of the product can be effectively reduced, high economic benefits are created, and the competitiveness of the device is improved.

The invention relates to the technical field of erasable films, in particular to a matt finish hot melt adhesive erasable film and a preparation process thereof. The matt finish hot melt adhesive erasable film is prepared from the following materials in parts by weight: 40 to 50 parts of ethylene-vinyl acetate copolymer, 20 to 30 parts of polystyrene-butadiene-styrene copolymer, 15 to 20 parts of hydrogenated rosin resin, 10 to 15 parts of terpene resin, 5 to 7 parts of modified polyethylene wax, 3 to 5 parts of microcrystalline wax, 1 to 2 parts of antioxidant and 4 to 6 parts of silicon dioxide modified glass fiber. The matt finish hot melt adhesive erasable film obtained by the preparation process disclosed by the invention not only has excellent matt effect and erasable property, but also has good durability.

The invention discloses a synthesis method of polymethylphosphonic acid glycol ester, which belongs to the technical field of polymethylphosphonic acid glycol ester preparation, and comprises the following steps: adding a solvent and ethylene glycol into a reaction bottle, stirring and cooling to 0-5 DEG C; placing molten methyl phosphorus oxychloride in a constant-pressure dropping funnel, and adding a solvent for dissolving and diluting to obtain a mixed solution; dropwise adding the mixed solution into a reaction bottle, wherein the temperature is controlled to be not higher than 5 DEG C in the dropwise adding process; carrying out deacidification treatment to obtain an intermediate product; and stirring and heating the intermediate product to 75 DEG C, and continuously introducing ethylene oxide for 2-6 hours to obtain the product. According to the method, methyl phosphorus oxychloride reacts with ethylene glycol, halogen is replaced, the product is obtained through ethylene oxide end capping, the byproduct serving as a low-boiling-point substance can be removed, and no catalyst is used, so that the acid value of the product PEMP is low.

The invention relates to a skid-mounted diisononyl phthalate synthesis device and a synthesis method, and belongs to the technical field of organic chemical synthesis. According to the method, the mixture of the catalyst and the isononyl alcohol and the mixture of the phthalic anhydride and the isononyl alcohol are directly mixed for the esterification reaction, the esterification reaction efficiency is high, the technological operation is simpler, and diisononyl phthalate in the prepared finished product is high in purity, low in acid value and low in viscosity and can be used as a plasticizer to be applied to PVC products; the molar ratio of isononyl alcohol and phthalic anhydride adopted in the esterification reaction is small, the amount of isononyl alcohol which is not completely reacted is relatively reduced while the conversion rate of diisononyl phthalate is ensured, and the difficulty of isononyl alcohol separation and recovery in the subsequent process steps is reduced; the skid-mounted synthesis device is formed by integrally mounting all the equipment on the same base, and is convenient to mount, small in occupied area and convenient to move.

The present invention discloses glycolide, a preparation method of glycolide and the obtained glycolide, wherein the glycolide has an acid value of less than 5 mol / t, a linear dimer content of less than 200 ppm, and a total cyclic polymer content of less than 400 ppm; the method comprises: (1) reacting an aqueous glycolic acid solution in the presence of a catalyst to obtain glycolic acid oligomers, wherein the aqueous glycolic acid solution contains at least one of an aldehyde compound, a ketone compound, and an ether compound; (2) washing the glycolic acid oligomers to obtain purified glycolic acid oligomers; (3) depolymerizing the purified glycolic acid oligomers to obtain a crude glycolide product; and (4) refining the crude glycolide product to obtain glycolide. The method of the present invention has a high glycolide yield, and the obtained glycolide product has the advantages of low acid value and low content of linear dimers and cyclic polymers (tetramer to octamer).

The invention relates to the field of fine chemical engineering, in particular to a pentaerythritol ester preparation system and a preparation method thereof.The pentaerythritol ester preparation system comprises an esterification reaction kettle, a temporary storage tank, a preheater, an esterification reaction tower, a heat exchanger, a molecular distiller and a post-treatment kettle; a downcomer communicated with the uppermost layer of catalytic reaction unit is arranged above the uppermost layer of catalytic reaction unit, every two adjacent layers of catalytic reaction units are communicated through the downcomer, a flash tank is arranged below the bottommost layer of catalytic reaction unit, and the gas outlet end of the flash tank is communicated with the multiple layers of catalytic reaction units through a gas rising pipe; a feed port II communicated with the fatty acid feed end is formed in one side of the bottom of the esterification reaction tower. A two-step esterification method is adopted, fatty acid entering from the bottom is changed into fatty acid steam through the flash tank, the fatty acid steam is in countercurrent contact with liquid in the downcomer in the multiple layers of catalytic reaction units and fully reacts, and pentaerythritol ester which is completely esterified and has a low acid value and a low hydroxyl value is obtained.

The invention relates to the technical field of food science, in particular to low-acid-value krill oil and a preparation method thereof.The preparation method comprises the following steps that S1, firstly, krill is cleaned, shelled and dried and then smashed into powder; s2, putting the krill powder into a solvent, and carrying out primary extraction to obtain an extracting solution; s3, performing grease separation on the primary extracting solution through a separator; s4, adding glycerol into the crude krill oil, and enabling the glycerol to react with the free fatty acid to generate glyceride; s5, glyceride is subjected to refining treatment, and refined krill oil is obtained; s6, placing the refined krill oil in a vacuum environment for dehydration treatment; s7, the obtained low-acid-value krill oil is subjected to sterile packaging and sealed storage, and a finished product is obtained. By optimizing the process steps, the acid value of the krill oil is remarkably reduced, the quality and the stability of the krill oil are improved, and the method is suitable for large-scale industrial production and meets the requirements of the market on high-quality krill oil.

The invention provides a sterilization method and application of sporoderm-broken ganoderma lucidum spore powder, and belongs to the technical field of health food and medicine processing. The sterilization method comprises the following steps: pretreating wall-broken ganoderma lucidum spore powder through drying and low-temperature ultrasound; after sealing and packaging, carrying out two-section type hot-pressing sterilization treatment; and after sterilization, supercritical CO2 treatment is adopted for post-treatment. According to the invention, low-temperature vacuum drying is matched with low-temperature ultrasonic treatment to realize moisture control and uniform distribution; after sealed packaging, two-section gradient hot-pressing sterilization is adopted, and sterilization thoroughness and thermosensitive component protection are both considered; and finally, residual microorganisms are complementarily killed through supercritical CO2 aftertreatment, oxidized grease is dissolved and removed to reduce the acid value and the peroxide value, meanwhile, oxygen is replaced to delay subsequent oxidation, and no solvent is left. The method is simple and convenient to operate, feasible in industrialization and suitable for processing and production of high-quality health-care foods and medicines.

The invention discloses castor oil and a refining method thereof. The refining method comprises irradiating crude castor oil under the action of a composite photocatalyst; the composite photocatalyst is a catalyst of activated carbon loaded with transition metal oxides; and the irradiation is performed by ultraviolet light. The method has a simple process flow, low energy consumption, low production cost, is suitable for industrial production, and the prepared castor oil meets the requirements of injection-grade drugs.

The present application relates to the technical field of waste mineral oil treatment, and specifically discloses a waste mineral oil regeneration treatment method. The waste mineral oil regeneration treatment method of the present application comprises the following steps: adding an alkaline regulator to the waste mineral oil, filtering, and obtaining pretreated waste mineral oil; preheating the pretreated waste mineral oil, distilling at atmospheric pressure, and preheating the pretreated waste mineral oil, distilling at atmospheric pressure to obtain a light component one and a heavy component one; the heavy component one is repeatedly heated and vacuum distilled, and the components after distillation are heat exchanged and condensed to obtain crude oil one and crude oil two; the light component one is condensed and then separated from oil and water to obtain light fuel oil; the crude oil one and the crude oil two are respectively mixed with an extraction solvent, and refined oil is extracted from the top of the extraction tower, and the bottom of the tower is extracted oil, and the extracted oil is heated by a flash tower, and the top of the tower is condensed to be a fresh solvent, and the bottom of the tower is extracted oil. The waste mineral oil regeneration treatment method of the present application has a high base oil recovery rate and better performance.

The present application belongs to the technical field of temperature control, and particularly relates to a temperature control liquid for coal-based Fischer-Tropsch synthesis hydrocarbon as well as a preparation method and application thereof. The temperature control liquid mainly comprises coal-based Fischer-Tropsch synthesis hydrocarbon, or the temperature control liquid mainly comprises coal-based Fischer-Tropsch synthesis hydrocarbon and liquid polyolefin. The distillation range of the coal-based Fischer-Tropsch synthesis hydrocarbon is less than or equal to 350 DEG C. The main component of the coal-based Fischer-Tropsch synthesis hydrocarbon is isomeric alkanes and normal alkanes with carbon number of 12-24, wherein the isomeric alkanes account for less than 90% of the total mass, and the normal alkanes account for more than 10% of the total mass. The kinematic viscosity of the coal-based Fischer-Tropsch synthesis hydrocarbon is less than or equal to 2.5 mm 2 / s at 100 DEG C, and 2.0-6.0 mm 2 / s at 40 DEG C. The kinematic viscosity of the liquid polyolefin is less than or equal to 8.0 mm 2 / s at 100 DEG C, and 2.0-20.0 mm 2 / s at 40 DEG C. The temperature control liquid has the characteristics of low density, low electrical conductivity, low kinematic viscosity and high heat conduction efficiency.

The invention provides a preparation method of soybean oil, which comprises three parts of soybean raw material selection, raw material pretreatment and extraction process, firstly, the soybean raw material is selected from fresh soybeans harvested within 6 months, and is stored in a place with the temperature of 15-30 DEG C, the humidity of below 12% and the ventilation rate of 1-3 times per hour, and secondly, the pretreatment comprises baking for 20-40 minutes at the temperature of 150-190 DEG C, and cooling at room temperature; finally, the soybean oil is obtained in a supercritical fluid extraction mode, supercritical carbon dioxide is selected as a solvent for supercritical fluid extraction, the temperature ranges from 35 DEG C to 70 DEG C, and the pressure ranges from 8 MPa to 35 MPa. Through proper raw material selection and processing technology, the obtained soybean oil has the characteristics of low acid value, high oxidation resistance and long shelf life, and has important market value.

The invention discloses a composite adsorbent for waste transformer oil treatment and a preparation method and application thereof, the preparation method comprises the following steps: taking 79-84 parts by mass of a main agent, 15-20 parts by mass of an auxiliary agent and 1-1.5 parts by mass of an additive, adding the raw materials into a sodium hydroxide alkali solution, and uniformly stirring to obtain a mixture; preparing the mixture into particles, sequentially carrying out primary drying treatment and secondary drying treatment, and cooling to room temperature to obtain the composite adsorbent. The composite adsorbent is prepared by taking the carclazyte and the aluminum oxide as main agents, taking the zeolite molecular sieve, the bentonite and the attapulgite powder as auxiliaries and adding a small amount of zinc oxide, compared with a single adsorbent, regenerated oil treated by the composite adsorbent is improved in appearance and transparent in color, and impurity components in waste transformer oil can be effectively removed.

The invention discloses a method for preparing sn-2 site fat rich in alpha-linolenic acid structure based on an enzymatic method, and relates to the technical field of biology, and the method comprises the following steps: (1) enzymatic acidolysis: mixing an alpha-linolenic acid product (the purity is greater than or equal to 70%), walnut oil and deionized water according to a ratio of 1: 1-5: 1 (mol / mol), and placing in a spiral test tube with a plug; adding 1 to 20 percent (w / w) of lipase Novozym 435 into the test tube; after the reactants are fully mixed, carrying out nitrogen charging treatment on the test tube to remove oxygen, and then tightly sealing the test tube; placing the test tube on a shaking table, setting the rotating speed to be 200r / min, and reacting at the temperature of 35-75 DEG C for 8-48 hours to obtain an acidolysis product. And (2) molecular distillation purification: putting the enzymatic acidolysis product into a molecular distillation instrument, and carrying out molecular distillation on the enzymatic acidolysis product to purify the crude product of the acidolysis product. The invention provides the preparation method of the structural grease, which has the advantages of high access rate, easiness in product purification and lower cost.

The invention discloses a refining and recycling method of waste lubricating oil, and relates to the technical field of lubricating oil recycling. The method comprises the following steps: performing ultrasonic circulating pretreatment on waste lubricating oil; then adding an oleophylic sulfydryl functionalized cyclodextrin composite material for reaction, and carrying out hot filtration in cooperation with aminated diatomite loaded nano zinc oxide; performing falling-film plasma activation and magnetic core-shell catalyst hydrotreatment on the filtrate; and finally, carrying out reduced pressure distillation and molecular distillation purification to obtain refined lubricating oil. The method provided by the invention realizes deep removal of colloid and heavy metals, effectively prevents catalyst poisoning, solves the problem of solid-liquid separation, and significantly improves the purity and quality of regenerated oil.

The invention relates to a butanol waste liquid recovery method, which comprises: providing a waste liquid produced by using propylene, hydrogen and carbon monoxide as raw materials to prepare n-butanol through a carbonylation reaction, the waste liquid comprising butyraldehyde, butyric acid, n-butanol, C8 alcohol, butyl butyrate, C12 and a heavy component substance; the waste liquid is subjected to light component removal through a light component removal tower, butyraldehyde is collected at the tower top, and light component removal liquid is obtained at the tower kettle; the light component removal liquid is subjected to heavy component removal through a heavy component removal tower, heavy component removal liquid is obtained at the tower top, and C8 alcohol, C12 and heavy component substances are collected at the tower kettle; mixing the de-heavy liquid with alkali liquor for neutralization reaction, and washing the reaction liquid with water to obtain an organic phase; enabling the organic phase to pass through an n-butyl alcohol rectifying tower, collecting n-butyl alcohol at the tower top, and obtaining kettle liquid at the tower kettle; the kettle liquid passes through a butyl butyrate rectifying tower, and butyl butyrate is obtained at the tower top; carrying out hydrogenation reaction on butyl butyrate under the action of a hydrogenation catalyst, and collecting n-butyl alcohol. According to the recovery method, useful components in the waste liquid are effectively recovered.

The invention provides olive oil with repairing, soothing and anti-wrinkle functions and a preparation method and application thereof, and belongs to the technical field of cosmetics, the preparation method comprises the following steps: mashing and sieving olive fruits to obtain olive pulp; performing rotary evaporation on the olive pulp, then adding water, mixing, and centrifuging to obtain supernate and olive pomace; separating the supernate to obtain crude olive oil I; mixing olive pomace with water, and performing ultrasonic treatment, enzymolysis and sterilization to obtain pomace pretreatment liquid; inoculating zymophyte into the pomace pretreatment liquid for fermentation, and sterilizing to obtain pomace fermentation liquid; centrifuging the pomace fermentation liquor to obtain supernate; separating the supernate to obtain crude olive oil II; mixing the olive crude oil I and the olive crude oil II, then adding a modified adsorbent, heating, stirring and filtering to obtain olive crude oil; and performing vacuum deodorization on the olive crude oil to obtain the olive oil. The olive oil prepared by the invention has stable performance, is suitable for cosmetics, and has good repairing, soothing and anti-wrinkle effects and the like.

The application discloses a vertical variable-temperature pressure-difference quantitative puffed nut kernel crisp processing method and a puffing equipment, and relates to the field of food processing and treatment. The method comprises the following steps: after the nut kernel raw material is cleaned and soaked, standing and draining; the pretreated nut kernel is loaded into a hanging basket in a vertical puffing tank, steam is introduced into the vertical puffing tank, the nut kernel is subjected to steaming treatment, the vertical puffing tank is heated, the water in the nut kernel is vaporized, the pressure in the tank is increased and the tank is kept warm; the pressure relief valve between the vertical puffing tank and the vacuum tank is quickly opened, the pressure in the vertical puffing tank is instantaneously reduced, the water in the nut kernel is flash evaporated, the volume of the nut kernel is expanded, and a honeycomb structure is formed; the nut kernel is continuously heated and dehydrated under vacuum until the water content of the nut kernel is reduced; heating is stopped, and the nut kernel is cooled to room temperature; and the micro-puffed crisp nut kernel is obtained. Through the above steps, the quality problems of the existing nut kernel, such as hard taste, easy oxidation, great loss of nutrients, short shelf life and serious homogenization after high-temperature roasting and frying processing, can be solved.

This invention discloses a green production method for biodiesel. First, pretreated feedstock oil and methanol are preheated and then fed into a reactor loaded with a superhydrophobic polymer solid acid catalyst for esterification. After oil-water separation, the oil phase is then fed into a reactor loaded with a macroporous strong-base ion exchange resin for transesterification. The biodiesel product is collected by vacuum distillation. The biodiesel production method provided by this invention has strong feedstock adaptability, no wastewater discharge, and excessive energy consumption. Methanol can be recycled, resulting in high feedstock utilization and product quality. Furthermore, the catalyst is simple to prepare, the reaction rate is fast, and the active phase is not easily lost.

The application discloses a kind of hyperbranched self-initiated polyester acrylate developing resins and preparation method, application, and the structural formula of the developing resin is.The developing resin has hyperbranched polyester core unit, quaternary carbon structure, carboxyl and light-curable group in structure, and it has the high efficiency of light curing and the environmental protection of alkali developing, and the hyperbranched light-cured film formed has higher hardness and adhesion.

This utility model relates to the field of DHA algal oil filtration technology, and more particularly to a filtration device for DHA algal oil, including a housing, a moving mechanism on the side of the housing, a thawing mechanism disposed within the moving mechanism, a first filtration mechanism fixedly installed below the thawing mechanism, and a second filtration mechanism fixedly installed below the first filtration mechanism. This utility model employs a split-type thawing box design in the thawing mechanism, which can quickly and evenly melt solidified algal oil raw materials, avoiding DHA oxidation loss caused by localized overheating. The moving mechanism, in conjunction with a sliding groove, allows for flexible pulling of the thawing box. The solenoid valve of the first filtration mechanism can precisely control the coarse filtration flow rate, while the second filtration mechanism further removes micron-sized impurities through silk mesh gradient filtration. The synergistic effect of the two stages ensures high light transmittance and low acid value of the algal oil. Real-time monitoring of the filtration process is achieved through a glass observation window and a weighing plate, and support legs and anti-slip pads enhance the equipment's resistance to displacement in vibration environments.

The invention belongs to the field of corrosion and protection of power grid materials, and particularly relates to a method for inhibiting oil sulfur corrosion of oil-immersed power equipment. The antioxidant T531 and the metal deactivator Irgamet 39 are added into the transformer insulating oil, when the concentration ratio of the T531 to the Irgamet 39 is smaller than 0.5, the oil sulfur corrosion of a copper winding is well inhibited, the influence on the performance of the insulating oil is small, the copper element content in the insulating oil does not exceed an attention value of 0.5 mg / kg, and the dielectric loss does not exceed a standard value of 0.02. The direct current resistivity is higher and is larger than 160 * 10 < 9 > omega.m, and the acid value of the insulating oil is lower and is smaller than 0.016 mgKOH / g; after the antioxidant and the metal deactivator are mixed according to the proportion, the oil sulfur corrosion resistance of the copper winding is greatly improved, the aging of insulating oil is inhibited, and the antioxidant has very high application potential in an oil-immersed transformer.

The invention discloses a preparation method of multi-effect sunflower seed oil. The preparation method comprises the following steps: S1, cleaning and airing sunflower seeds, and heating and stir-frying with a frying pan; s2, sunflower seeds are stir-fried, soaked, ground into thick liquid and centrifuged, and primary crude oil and thick liquid are obtained; s3, separating the slurry according to a ratio of 9: 1-8: 2, respectively performing enzymolysis to obtain an enzymatic hydrolysate A and an enzymatic hydrolysate B, and performing enzyme deactivation; s4, mixing the enzyme-deactivated enzymatic hydrolysate A with the primary crude oil, heating, degumming, desoaping, decolorizing and deodorizing to obtain sunflower seed oil A; s5, centrifuging the enzymatic hydrolysate B, taking supernate, performing ultrafiltration through an ultrafiltration membrane, collecting filtrate with the molecular weight of 1-3 KDa, and dialyzing and desalting the filtrate to obtain a sunflower seed oil additive B; and S6, stirring and mixing the sunflower seed oil A, the sunflower seed oil additive B, the squalene additive and the multivitamin mixture, deacidifying and filtering again to obtain the multi-effect sunflower seed oil with the acid value of 0.15 mgKOH / g-0. 95 mgKOH / g. The sunflower seed oil disclosed by the invention is high in oil yield, small in acid value, unique in flavor and high in nutritional value.