226 results about "Fatty acid methyl ester" patented technology

The invention discloses industrial-grade mixed oil produced by utilizing kitchen waste oil and a preparation method of the industrial-grade mixed oil, and belongs to the technical field of recycling of the kitchen waste oil. The invention relates to industrial-grade mixed oil produced by using kitchen waste oil and a preparation method thereof, and the preparation method comprises the following steps: firstly collecting kitchen waste containing the waste oil, and storing the kitchen waste in a container through special equipment; carrying out screen solid-liquid separation, cleaning grease on the surface of the solid waste, and then carrying out precipitation separation; then carrying out centrifugal separation, chemical cleaning, water washing, acid treatment, dehydration, degumming and metal ion removal on the separated grease and oil-containing liquid; carrying out ultrasonic-assisted multistage ester exchange after enzymolysis optimization, carrying out membrane separation on glycerol and fatty acid methyl ester, and carrying out reduced pressure distillation to obtain a high-purity fraction; carrying out adsorption refining, plasma treatment and supercritical fluid extraction; finally, nano particles are added and blended with additives, efficient recycling of the kitchen waste oil is achieved, and then high-purity industrial-grade mixed oil is prepared.

This application discloses a detergent tablet free of SLS surfactant and its preparation method. The detergent tablet includes a film-forming agent, an anionic surfactant, a non-ionic surfactant, a chelating agent, an enzyme preparation, an auxiliary agent and a essence. The film-forming agent includes one or more of polyvinyl alcohol, cellulose, and dodecenyl succinate starch ester. The anionic surfactant includes at least two of sodium α-olefin sulfonate, sodium fatty acid methyl ester sulfonate, and sodium hydroxyethyl sulfonate. The non-ionic surfactant includes at least two of fatty alcohol polyoxyethylene ethers, fatty acid methyl ester ethoxylate, and oil ethoxylate.

The utility model discloses reaction equipment with high crude methyl ester yield, which comprises a stirring kettle and a material circulating system, the material circulating system comprises a circulating pump, a spray pipe arranged in the stirring kettle and a mixing nozzle arranged on the spray pipe, and a bottom outlet of the stirring kettle is connected with a feed port of the circulating pump through a first pipeline. An outlet of the circulating pump is connected with the spray pipe through a second pipeline; the mixing nozzle comprises a first sprayer and a second sprayer, and an outer flaring in the lower portion of the second sprayer is in clearance fit with the conical head through a connecting piece. The material circulating system can realize bottom-out and top-in of materials, so that the mixing of an oil phase and an enzyme water phase is promoted through the reciprocating circulation. In addition, the material circulating system is provided with a plurality of mixing nozzles, the flow speed of spraying of the first spray head is large, so that a negative pressure suction gap is formed at the joint of the second spray head and the first spray head, materials in the stirring kettle can enter the mixing nozzles under the action of negative pressure, an oil phase and an enzyme water phase are intensively mixed, and the yield of fatty acid methyl ester is improved.

The invention discloses a multi-solid waste interface collaborative optimization regenerant and a preparation method of a regenerated asphalt mixture thereof, and belongs to the technical field of road material regeneration. In order to solve the problems that a traditional single regenerant is insufficient in performance improvement, low in solid waste utilization rate and high in carbon emission, citric acid is used for activating steel slag powder to enhance the reactivity of the steel slag powder and fatty acid methyl ester (FAME) ester groups, and a silane coupling agent is used for modifying waste tire rubber powder to improve the interfacial compatibility of the waste tire rubber powder with steel slag and asphalt; lignosulfonate stabilizes FAME, reduces interfacial tension of FAME and improves dispersibility of FAME, and then three-component interface collaborative optimization is achieved. According to the invention, the rigid reinforcing effect of the steel slag powder, the elastic recovery characteristic of the rubber powder and the regeneration function of the FAME are fully utilized, and a gradient temperature mixing process is combined to form a'rigid reinforcing-elastic buffering-dynamic regeneration 'synergistic mechanism. The composite regenerant can recover the viscosity, rheology and other characteristics of the aged asphalt, improve the high and low temperature and other comprehensive pavement performance of the regenerated asphalt mixture, and achieve the purposes of multi-element solid waste recycling and low carbonization.

The present application provides novel polypeptides with lipase activity, which comprise the amino acid sequences shown in SEQ ID NO: 4 or 6, or sequences obtained by substituting, deleting or adding at least one amino acid to the above sequences. The present application also provides polynucleotides encoding the polypeptides, expression vectors containing the above polynucleotides and host cells. In addition, the present application also relates to the uses of the polypeptides with lipase activity. The polypeptides disclosed herein can rapidly prepare fatty acid methyl esters at high temperatures and high methanol concentrations, and are thus used for the preparation of biodiesel.

The invention discloses a metal degreasing agent and a preparation method thereof, and belongs to the technical field of degreasing. Comprising lipase, protease, short-chain fatty acid methyl ester ethoxylate sodium sulfonate, cocamidopropyl betaine, alkyl glucoside, sodium silicate, sodium metasilicate, sodium citrate, disodium ethylene diamine tetraacetate, calcium formate, polyvinyl alcohol-sodium alginate microcapsules, a polyoxyethylene polyoxypropylene block copolymer, sodium carboxymethyl cellulose and water. And the polyvinyl alcohol-sodium alginate microcapsule exists in the metal degreasing agent as a carrier of the lipase and the protease. According to the metal degreasing agent, a microcapsule protection structure is used in the metal degreasing agent, the two technical problems of enzyme-surfactant compatibility and enzyme-alkaline environment compatibility which are difficult to solve for a long time in an industrial degreasing agent are solved, the degreasing agent is easy to actually operate, special equipment is not needed, a traditional degreasing agent can be directly replaced, and the metal degreasing agent is suitable for industrial application. Good market application prospects are realized.

The invention relates to the technical field of fire extinguishing agents, and particularly discloses a lithium battery fire extinguishing agent and a preparation method thereof. The degradable surfactant is selected from at least one of alkyl glycoside and fatty acid methyl ester sulfonate; the particle size of the nanoscale silicon dioxide particles is 10 to 100 nm; the composite flame retardant is formed by compounding an organic phosphorus compound and graphene oxide according to a mass ratio of 1: (0.5-2); the antifreeze agent is selected from at least one of ethylene glycol and propylene glycol; the thickening agent is selected from at least one of xanthan gum and sodium carboxymethyl cellulose; the preservative is selected from at least one of sodium benzoate and potassium sorbate; through the synergistic effect of the composite flame retardant, the fire extinguishing efficiency is remarkably improved, reburning is inhibited, in addition, nano silicon dioxide is uniformly dispersed after being subjected to surface modification to form a compact heat insulation layer, the degradable surfactant and the environment-friendly preservative are combined, and the agent is free of toxic residues.

The invention relates to a mining underground hydrogen sulfide removal dust falling agent and a preparation method thereof, and belongs to the technical field of dust suppression and dust falling. The dust settling agent provided by the invention comprises the following components: 10-15 parts of fatty acid methyl ester sodium sulfonate; 3 to 5 parts of sodium lauryl sulfate; 4 to 6 parts of sodium dodecyl benzene sulfonate; 3 to 5 parts of dodecyl amine; 1-3 parts of sodium bicarbonate; according to the present invention, through the synergistic interaction effect of the surfactant, the dust particles and the liquid are well dispersed and wetted, and the reaction of the sodium bicarbonate and the hydrogen sulfide is promoted so as to increase the dust adsorption efficiency and the hydrogen sulfide gas neutralization effect, such that the technical purpose of the present invention is achieved. The raw materials are easy to obtain, the preparation process is simple and convenient, the cost is low, the effect is remarkable, the working environment of coal miners can be effectively improved, and safety and health of the miners are guaranteed.

The invention relates to the technical field of cleaning agents, and particularly discloses a composite cleaning agent as well as a preparation method and application thereof. The composite cleaning agent comprises the following raw material components in percentage by mass: 5%-10% of inorganic particles, 5%-15% of a surfactant, 15%-30% of a cleaning aid and the balance of water, wherein the surface active agent is prepared from rhamnolipid, fatty acid methyl ester ethoxylate, cocamidopropyl betaine and sophorolipid; the inorganic particles comprise soluble sodium salt and nano silicon dioxide; the cleaning auxiliary agent comprises a geranium extracting solution, a herba portulacae extracting solution, lauric acid and glycerol. The composite cleaning agent is simple in raw material components, simple and convenient in preparation method, low in cost and free of secondary pollution to the environment. The composite cleaning agent effectively solves the problems that an existing train cleaning agent is poor in cleaning effect, complex in manufacturing process and unfriendly to the environment.

The invention provides an efficient oil-removing water purifying agent and a preparation method thereof. The oil-removing water purifying agent mainly comprises a micro-crosslinking multi-branched cationic copolymer, fatty acid methyl ester ethoxylate, dodecyl dimethyl benzyl ammonium chloride and deionized water. The micro-crosslinked multi-branched cationic copolymer is mainly prepared from a non-polar solvent, a branched monomer, a crosslinking monomer, acrylamide, a cationic monomer, an emulsifier, an initiator, an organic solvent and deionized water, and the fatty acid methyl ester ethoxylate is mainly prepared from methyl stearate, a catalyst, ethylene oxide, isopropanol and deionized water. The efficient oil-removing water purifying agent mainly aims at the defects of an existing oil-removing water purifying agent, the micro-crosslinking multi-branched cationic copolymer is used as a flocculating agent, the fatty acid methyl ester ethoxylate is used as a nonionic surfactant, and through the synergistic effect of the micro-crosslinking multi-branched cationic copolymer and the fatty acid methyl ester ethoxylate, the efficient oil-removing water purifying agent is obtained. Therefore, the prepared oil-removing water purifying agent has better oil-removing effect and dispersing performance.

The invention relates to the field of inorganic nonmetal powder materials, and discloses a preparation method of silicon nitride powder, which comprises the following steps: (1) mixing a surfactant, liquid ammonia and an organic solvent to form a to-be-reacted solution, and mixing the to-be-reacted solution with a silicon tetrachloride solution for substitution reaction to obtain a solution containing silicon imine suspended matters; the surfactant is selected from one or more of sodium dodecyl sulfate, polyvinylpyrrolidone, sodium stearate, sodium dodecyl benzene sulfonate, fatty acid methyl ester ethoxylate sulfonate, fatty acid sorbitan, polysorbate-20 and polysorbate-80; the surfactant is selected from one or more of sodium dodecyl sulfate, polyvinylpyrrolidone, sodium stearate, sodium dodecyl benzene sulfonate, fatty acid methyl ester ethoxylate sulfonate, fatty acid sorbitan, polysorbate-20 and polysorbate-80; (2) carrying out suspended matter extraction and impurity removal on the solution containing the silicon imine suspended matter to obtain silicon imine powder; (3) performing thermal decomposition on the silicon imine powder to obtain amorphous silicon nitride powder; and (4) crystallizing the amorphous silicon nitride powder to obtain the alpha-phase silicon nitride powder. The method can reduce the impurity content and agglomeration degree of the precursor so as to improve the quality of the silicon nitride powder.

This invention discloses a method for preparing high-quality bio-based 1,9-nonanediol, comprising the following steps: transesterification, precipitation, fatty acid methyl ester refining, ozone oxidation pyrolysis, solvent recovery, esterification, dimethyl azelaate refining, and hydrogenation to obtain high-quality bio-based 1,9-nonanediol. This invention achieves gradient and full-component utilization of vegetable oil raw materials: the oil-based portion of triglycerides is used to produce high-quality bio-based 1,9-nonanediol, while simultaneously producing byproducts such as methyl palmitate, methyl stearate, propionic acid, hexanoic acid, and nonanoic acid; the glycerol-based portion of triglycerides is used as a byproduct of glycerol production. This invention utilizes esterification to reconstruct the products of ozone oxidation pyrolysis, converting the high-boiling-point monomethyl azelaate into the low-boiling-point dimethyl azelaate, achieving efficient separation from saturated fatty acid methyl esters. The dimethyl azelaate, as a raw material, is then hydrogenated to obtain high-quality nonanediol, significantly reducing production costs.

This invention relates to an alcohol-based fuel additive, its preparation method, and its application, belonging to the technical field of diesel fuel additives. The additive, by weight, comprises: a mixture of C3-C10 fatty alcohols, fatty acid methyl esters, methyl tert-butyl ether, isoamyl nitrate, dimethyl carbonate, and diesel fuel. The mass ratio of methyl tert-butyl ether to dimethyl carbonate is [value missing]. This invention employs a stepped feeding process, solving the problem of combustion improver failure caused by high shear heat generation by cooling the fuel before adding isoamyl nitrate, and ensuring long-term fuel stability at -10°C using a specific polarity gradient ratio. The fuel prepared by this invention has a high cetane number, strong power, and good anti-stratification effect, making it suitable for compression ignition engines.

The present application relates to a kind of directly oiling oil agent of crude oil of polyester high-speed spinning special oil and preparation method, the oil agent of the present application contains not less than 20wt% anti-coking agent;Anti-coking agent is composed of fatty acid methyl ester ethoxylate type surfactant and polyethylene glycol laurate of double end-capped;Preparation method is: proportionally sequentially adding each component into reaction kettle, stirring uniformly, after 1~1.5h under 40~45 ℃, send to precipitation kettle and carry out cooling, after 15min, filter, directly oiling oil agent of polyester high-speed spinning special oil of crude oil is obtained.The oil agent of the present application contains little water, is not easy to delamination, corruption, not easy to evaporate when passing through hot roll, to avoid the environmental hazards and influence to human health generated, and it has good anti-coking property and antistatic property, the energy consumption when carrying out polyester high-speed spinning also has some reduction.

The invention provides dewaxing, repairing and blocking integrated liquid and application thereof in a pathological specimen immunohistochemical operation method. The dewaxing, repairing and blocking integrated liquid is prepared from the following components in percentage by mass: 1.0 to 5.0 percent of Triton-100, 1.0 to 5.0 percent of Tween 20, 0.1 to 3.0 percent of fatty acid methyl ester ethoxylate, 0.1 to 1.0 percent of tetrahydrofurfuryl alcohol, 0.001 to 0.01 percent of 2-methyl-3-isothiazolinone, 0.01 to 4.0 percent of buffer solution and the balance of water. In the process of applying the dewaxing, repairing and blocking integrated body fluid to the pathological specimen immunohistochemical operation method, compared with an existing laboratory method, the dewaxing, repairing and blocking integrated body fluid is used at the temperature of 65-75 DEG C, the steps of xylene dewaxing and gradient alcohol hydration after dewaxing in an existing laboratory can be replaced, the temperature continues to rise to 95-99 DEG C, and when antigen repairing is conducted on a sample, the temperature of the sample is lowered to 95-99 DEG C; according to the method, the step of blocking 0.3-3% of hydrogen peroxide in an existing laboratory is replaced by the enzyme activity of high temperature on endogenous catalase, and the same effects of dewaxing, repairing and blocking in the existing laboratory are achieved on the basis of reducing the experimental steps and the experimental time.

The invention discloses a high-alkali-resistance textile degreaser as well as a preparation method and application thereof, and relates to the technical field of textile pretreatment. The method comprises the following steps: S1, carrying out a neutralization reaction on fatty acid methyl ester sulfonic acid and a mixed alkali solution of sodium hydroxide and alkanolamine, and controlling the pH value of a reaction endpoint to be 6.0-7.5 to obtain a mixed salt of sodium fatty acid methyl ester sulfonic acid and alkanolamine; s2, adding an alkyl polyglucoside aqueous solution into the mixed salt obtained in the step S1 to form mixed micelles; s3, fatty acid ester ethoxylate and a bio-based cosolvent are added into the mixed micelle obtained in the step S2, homogenization treatment is conducted, and homogeneous microemulsion is obtained; and S4, cooling the microemulsion obtained in the step S3, adding a chelating dispersant and water, and uniformly mixing to form the high-alkali-resistance textile degreaser. The textile degreaser prepared through dication modification and micelle recombination has good alkali resistance, excellent low-temperature water solubility and full-bio-based environmental protection characteristics, and is suitable for pretreatment of textiles such as cotton, polyester and the like.

This invention relates to the field of coal washing and beneficiation technology, and discloses a method for preparing a nano-flotation reagent for coarse coal slime. The method involves mixing sulfonated fatty acid methyl ester with kerosene and n-octanol to form an oil phase, then further mixing this with an aqueous phase containing a nonionic emulsifier, and adding functionalized nano-silica to obtain a mixed solution. This mixed solution is then sequentially treated by ultrasonic dispersion, high-speed stirring, and micro-electrolysis to generate nano / microbubbles in situ and maintain their uniform distribution, resulting in a nano-microemulsion. This invention can significantly improve the adhesion efficiency and loading capacity of coarse coal surfaces, effectively suppress tailings runoff, and improve the transportation and collection efficiency of coarse coal. It solves the problems of low clean coal yield and tailings runoff caused by the low adsorption efficiency and poor foam stability of traditional flotation reagents for coarse coal.

The invention discloses a method for detecting glyceride and fatty acid composition ratio in mixed fatty acid glyceride by thin-layer chromatography-gas chromatography coupling, and the method mainly comprises the following steps: 1) internal standard solution is prepared; 2) mixed fatty acid glyceride need testing solution is prepared; 3) thin-layer chromatography is used to separate mixed fatty acid glyceride; 4) fatty acid methyl ester is prepared; 5) gas chromatography is used to detect, and the fatty acid composition of monoglyceride, diglyceride and triglyceride and the ratio of each fatty acid are determined respectively; and 6) the sum of the fatty acids of each monoglyceride, diglyceride and triglyceride obtained after data analysis in step 5) is divided by the fatty acid sum of monoglyceride, diglyceride and triglyceride, and the composition ratio of each monoglyceride, diglyceride and triglyceride in mixed fatty acid glyceride is obtained. The method of the present invention is simple and efficient to operate, and is quantitatively accurate, and methyl esterification reaction conditions are mild, equipment is simple, and no special equipment is required.

The invention relates to the technical field of smelting waste residues, in particular to a method for recovering nonferrous metals from smelting waste residues. The method comprises the following steps that S1, the smelting waste residues are pretreated, specifically, the smelting waste residues are copper smelting residues, and the smelting waste residues are pretreated to obtain mineral powder; and S2, a collecting agent is prepared, wherein the collecting agent is prepared from orange peel, warm water, ethyl alcohol, oleoyl chloride, acetone, triethylamine and fatty acid methyl ester. In the recovery treatment process of the smelting waste residues, by adjusting and optimizing the formula of the collecting agent and utilizing the surface activity capacity of pectin, polysaccharide and terpene contained in the orange peel, the collecting agent is endowed with good mineral affinity capacity, and the collecting agent can be used for collecting metal ions. The collecting agent can play a role in wetting and dispersing in a flotation environment, so that the collecting agent can be firmly adsorbed on the surface of copper minerals generated after melting, and the efficiency of flotation adsorption of the copper minerals is effectively improved.

The invention relates to the field of wood modification, in particular to modified wood and a modification method thereof. The method comprises the following steps: (1) drying wood to be modified to constant weight to obtain dried wood; (2) the dried wood is placed in steeping liquor to be treated, and steeped wood is obtained; the steeping liquor comprises any one of steeping liquor I and steeping liquor II; the impregnation liquid I comprises silicate and organic acid I; the impregnation liquid II comprises organic acid II, mixed fatty acid methyl ester and wax. On the premise of ensuring simple operation steps, the porosity of the wood can be reduced, and the dimensional stability, high humidity resistance and salt resistance of the wood can be improved.

A brightening and stain-removing laundry sheet and a preparation method therefor. The laundry sheet comprises: a film-forming agent, an anionic surfactant, a nonionic surfactant, a fluorescent brightening agent, an anti-fouling agent, an enzyme formulation, a plant extract, a chelating agent, and an auxiliary agent. The film-forming agent comprises a film-forming agent A and a film-forming agent B, the film-forming agent A being polyvinyl alcohol, and the film-forming agent B comprising one or more of polyvinylpyrrolidone and modified polyvinyl alcohol. The anionic surfactant comprises sodium alkyl sulfate, sodium fatty acid methyl ester sulfonate, and sodium α-alkenyl sulfonate; and the nonionic surfactant comprises polyglycerol ester of fatty acid, fatty alcohol-polyoxyethylene ether, fatty acid methyl ester ethoxylate, and alkyl polyglycoside. The laundry sheet has high solubility, achieves a remarkable brightening effect on fabrics while having stain-removing capability, and further possesses the advantages of good portability, convenient use, no solid matter remaining after use, etc.

The invention discloses a corrosion inhibitor based on astragalus membranaceus leaves, a compound corrosion inhibitor and a preparation method and application thereof, and belongs to the technical field of corrosion inhibitor preparation.The preparation method comprises the following steps that astragalus membranaceus leaf powder is placed in an ethanol water solution, ultrasonic-assisted extraction is conducted after room-temperature dipping, after extraction is completed, an extracting solution is filtered and collected, and rotary evaporation and concentration are conducted; then low-temperature freeze drying is conducted, the corrosion inhibitor based on the astragalus membranaceus leaves is obtained, and the efficient green compound corrosion inhibitor is obtained by compounding the corrosion inhibitor based on the astragalus membranaceus leaves with calcium glycinate and sodium fatty acid methyl ester sulfonate. The method is used for solving the technical problems that biomass resources are wasted, the environment is polluted and a green corrosion inhibitor for aluminum in an alkaline environment is deficient due to the fact that existing astragalus membranaceus leaves are discarded as a traditional Chinese medicinal material processing byproduct for a long time.

Compositions comprising oils of plant or animal origin, such as fatty acid alkyl esters, are stabilized against oxidation using oxidized aminophenol antioxidants. The aminophenol includes one or two carbon-containing groups including hydroxyl groups and / or ether groups separated from an N atom by one or more carbon atoms. The oxidized aminophenol antioxidants effectively control oxidation in moderate and even low amounts, can be used in a variety of different oil and fatty acid methyl ester formulations, and are effective at elevated temperatures, and exhibit significantly superior performance to conventional antioxidants.

The invention relates to a preparation method and application of a nucleating agent. The preparation method comprises the following steps: mixing solvent pure water, calcium hydroxide and fatty acid methyl ester sulfonate, and heating; dropwise adding hexahydrophthalic anhydride into the mixed solution, and after dropwise adding is completed, carrying out heat preservation reaction to obtain the calcium hexahydrophthalate. The product has excellent performance when used for thermoplastic resin such as polyolefin.

The invention relates to wide-temperature-range modified natural ester insulating oil and a molecular structure design method thereof, and the molecular structure of the wide-temperature-range modified natural ester insulating oil with different ester chain structures is obtained by converting natural ester into mixed fatty acid methyl ester with the chain length of C8-C18, then blending the proportion and introducing groups for molecular modification. According to the design method, natural ester insulating oil molecules with different ester chain structures are constructed, and the influence rule of the fatty acid methyl ester carbon chain length proportion, the C = C double bond number and the modification group on the flash point and pour point of the natural ester insulating oil is obtained; the obtained wide-temperature-range modified natural ester insulating oil not only keeps the high flash point of the natural ester insulating oil, but also has the characteristic of low pour point, so that the working temperature range of the natural ester insulating oil is widened, and the defect that a natural ester insulating oil transformer operates under high-altitude, cold regions and extreme weather conditions is overcome; the preparation process is simple, reaction conditions are mild, the environment is not polluted, and batch production is easy.

The invention is suitable for the technical field of wire and cable materials, and provides an epoxy fatty acid methyl ester wire and cable material and a preparation method thereof. Comprising the following components: 2-5 parts of epoxy fatty acid methyl ester, 30-45 parts of PVC resin, 2-3 parts of PMMA resin, 3-4.5 parts of calcium carbonate, 4.5-7.5 parts of talcum powder, 1-3 parts of long glass fiber, 3-6 parts of a flame retardant, 0.5-1.5 parts of an antioxidant, 2-4 parts of nano metal oxide and 0.8-1.5 parts of a compatilizer. Preferably, the content ratio of the PVC resin to the PMMA resin is 15: 1; preferably, the flame retardant is one or more of hollow ceramic microbeads and hollow glass microbeads; preferably, the epoxy fatty acid methyl ester wire and cable material also comprises a rare earth oxide, and the weight part of the rare earth oxide is 1.4-2.6 parts. The material prepared by the invention not only has high strength, high toughness and good thermal stability, but also has excellent flame retardant property, and can effectively guarantee the safety and reliability of wires and cables in the use process.

The invention relates to the technical field of quenching oil, in particular to high-wettability quenching oil and a preparation method thereof. The high-wettability quenching oil comprises the following substances in parts by weight: 40-60 parts of trimethylolpropane; 8-15 parts of tall oil fatty acid; 0.8 to 1.5 parts of a catalyst; and 45 to 55 parts of xylene. The fatty acid methyl ester synthesized by adopting trimethylolpropane and tall oil fatty acid as raw materials has good fluidity and relatively low viscosity, and is beneficial to improving the heat exchange efficiency between metal and quenching oil, so that the cooling effect is improved. On the basis, the molecular structure of the prepared fatty acid methyl ester comprises a long-chain fatty acid part and a short-chain methanol part. The amphiphilic structure enables the fatty acid methyl ester to show good interfacial activity on a water and oil phase interface, so that the wetting ability of the fatty acid methyl ester to a metal surface is enhanced.

This invention belongs to the field of drilling engineering technology, specifically relating to a nanofiber-reinforced foam system for foam drilling fluid and its preparation method. The nanofiber-reinforced foam system for foam drilling fluid includes a gas phase and a liquid phase. The liquid phase comprises the following raw material components by mass percentage: 0.3-0.8 wt% foaming agent, 0.3-1.0 wt% nanofibers, and the balance being water. The foaming agent is prepared by in-situ polymerization of sodium isomeric tridecyl alcohol polyoxyethylene ether carboxylate and fatty acid methyl ester ethoxylate, followed by the introduction of hydrophilic monomers and crosslinking agents, using ammonium persulfate as an initiator. This invention's system exhibits high temperature and high salinity resistance, strong foam stability, and solves the problems of poor stability, insufficient temperature and salt resistance, high cost, and poor environmental performance of existing foam drilling fluids, achieving intelligent matching of foam performance with formation conditions.

The invention discloses a method for preparing high-purity vanadium pentoxide based on nano-filtration and membrane separation coupling. The method comprises the following steps: (1) carrying out ball milling and sieving on vanadium slag; mixing the ball-milled vanadium slag with a sodium hydroxide solution, and removing insoluble impurities to obtain a vanadium-containing solution; (2) adding ethoxylated fatty acid methyl ester into the vanadium-containing solution, and uniformly stirring to obtain a vanadium-containing mixed solution; pressurizing to enable the vanadium-containing mixed solution to pass through a nanofiltration membrane, and collecting a vanadium-containing concentrated solution; (3) adding ammonium sulfate into the vanadium-containing concentrated solution, and stirring to separate out precipitate to obtain a vanadium-containing solid; and (4) drying and calcining the vanadium-containing solid to obtain vanadium pentoxide. The purity of the obtained vanadium pentoxide is greater than or equal to 99.99%, and the recovery rate of vanadium is greater than or equal to 95.0%. The method is simple in technological process, the vanadium-containing solution is purified through a nano-filtration and membrane separation method, the separation process is simple and convenient, the separation efficiency is high, the production period can be shortened, the cost is reduced, and environmental pollution is reduced.

The invention relates to the technical field of plasticizers, in particular to a chlorinated fatty acid methyl ester composite PVC plasticizer and a preparation process thereof.The chlorinated fatty acid methyl ester composite PVC plasticizer is prepared from, by weight, 70-85 parts of chlorinated fatty acid methyl ester, 10-20 parts of epoxidized soybean oil, 3-5 parts of stabilizing powder, 1-3 parts of viscosity reduction auxiliaries, 1-2 parts of adsorption materials, 1-1.5 parts of anti-yellowing composite powder and 0.5-1 part of calcium-zinc stabilizer. According to the invention, rare earth composite particles coated with stearic acid are introduced into the stable powder, an efficient thermal stable network is constructed, active groups in the composite particles selectively capture acidic ions released by decomposition of polyvinyl chloride, a chain reaction of acid catalytic degradation is interrupted, and the hydrolysis process of ester groups can be delayed; the decomposition temperature of the material in a high-temperature environment is increased, and the technical bottleneck of insufficient high-temperature stability of the traditional plasticizer is solved.