29 results about "Tridecane" patented technology

The invention belongs to the technical field of cosmetics, and discloses micro-emulsion essence water containing ceramide and a preparation method of the micro-emulsion essence water. The micro-emulsion essence containing ceramide is prepared from the following components: an emulsifier, a humectant, polypeptide, small molecular grease and water, the emulsifying agent comprises polyglycerol-10 oleate, the emulsifying agent does not contain a PEG and / or PPG structure, the humectant comprises glycerol and ceramide, and the small molecule grease comprises at least one of tridecane, undecane, isononyl isononanoate, propyl heptyl octoate, coconut oil alcohol-octoate / caprate, dicapryl carbonate and dioctyl ether. The micro-emulsion essence water containing ceramide has excellent stability, low viscosity, refreshing texture which is common to water and fine skin feeling, and also has excellent moisturizing and tightening effects.

The invention belongs to the technical field of desulfurizer preparation, and particularly relates to an oil field composite desulfurizer and a preparation method thereof. The compound desulfurizer for the oil field is prepared from the following raw materials in percentage by mass: 12 to 14 percent of 6-tridecyl-1, 3, 5-triazine-2, 4-diamine, 25 to 27 percent of tetramethylguanidine lactate, 7 to 9 percent of glutamic acid-N, N-ferric diacetate, 3.6 to 4.0 percent of sodium dioctyl sulfosuccinate, 1.0 to 1.3 percent of glyceryl polyoxypropylene polyoxyethylene ether and the balance of water. The compound desulfurizer for the oil field has the advantages that the desulfurization speed is high, the desulfurization depth and durability are considered, and the problems that a traditional desulfurizer is easy to emulsify and poor in compatibility with crude oil are solved.

The invention relates to the technical field of resource recovery, and provides a novel method for efficiently extracting gold. The method provided by the invention comprises the following steps: mixing tridecane and a gold-containing solution, forming micro-droplets under the ultrasonic action, and extracting Au (III) in the gold-containing solution. Au (III) in water is reduced through superoxide free radicals and electrons generated on the micro-liquid drop-oil interface under the ultrasonic action to generate Au (0) precipitates, and therefore efficient extraction of Au (III) is achieved. The method provided by the invention only needs to use commercially available tridecane and ultrasound as unique energy sources, and has the remarkable advantages of simplicity and convenience in operation, low cost and no secondary pollution. Results of the embodiment show that the method provided by the invention has a good removal effect on gold-containing solutions with the concentration of 0.01-1 mM and the pH value of 1-10, and the removal rate of gold can reach 95% or above.

The application provides a production device of a trans-2-[2-(5- 18 F]fluorotridecyl)cyclopropyl]acetic acid (hereinafter referred to as "compound I") liquid composition, comprising: a pretreatment module for enriching 18 F ions; a reaction module for reacting the enriched 18 F ions with a compound I precursor to generate a compound I tert-butyl ester, and performing a tert-butyl ester removal reaction on the compound I tert-butyl ester to obtain a compound I crude product; a purification module for purifying the compound I crude product to obtain a compound I pure product; and a prescription module for prescribing the compound I pure product obtained by purification as the compound I liquid composition. The above device has a simple process operation procedure, high yield, and can meet the use of multiple people in a single preparation, and the prepared compound I liquid composition can be directly used in clinical treatment. The application also provides a method for preparing the compound I liquid composition by using the above device and the use of the above device in preparing the compound I liquid composition.

The application discloses a tetrahydroindazole biphenyl type fluorescent probe for detecting hydrazine and a preparation method and application thereof. The fluorescent probe is (3-(4-((2,5,8,11-tetraoxatridecan-13-yloxy)-4'- (6,6-dimethyl-2-(4-nitrophenyl)-4,5,6,7-tetrahydro-2H-5,7-methanobenzimidazole-3-yl)-1,1'-biphenyl-3-yl)-2-(pyridin-4-yl)acrylonitrile (TOPIB-PAN for short). The application uses 4-((2,5,8,11-tetraoxatridecan-13-yloxy)-4'- (6,6-dimethyl-2-(4-nitrophenyl)-4,5,6,7-tetrahydro-2H-5,7-methanobenzimidazole-3-yl)-1,1'-biphenyl-3-formaldehyde (TOPIB-CA for short) as a raw material, and performs an aldol condensation reaction with 4-pyridine acetonitrile to obtain the compound TOPIB-PAN. The compound TOPIB-PAN can specifically react with hydrazine. Under the irradiation of ultraviolet light with a wavelength of 365nm, the solution containing the compound emits green fluorescence. After hydrazine is added into the solution, the fluorescence color of the solution changes from green to colorless. Therefore, the compound can be used as a fluorescent probe for detecting hydrazine, has many advantages such as a low detection limit (7.9*10 ‑ 8 mol / L), a wide pH use range (3-11) and high light stability (>1800min), and has a good application prospect.

The invention provides a marine fungus-derived petroleum degrading enzyme, a gene A6006 and application thereof, belongs to the crossing field of biological enzyme technology and environmental remediation, and provides the marine fungus-derived petroleum degrading enzyme, the amino acid sequence of which is shown as SEQ ID NO.2. The gene A6006 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A6006 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A6006 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A6006 of the marine fungus-derived petroleum degrading enzyme can be used for degrading petroleum; the nucleotide sequence of the gene after being optimized by an escherichia coli codon is shown as SEQ ID NO. 1; the marine fungus-derived petroleum degrading enzyme provided by the invention can degrade dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, hexadecanoic acid, naphthalene, phenanthrene and pyrene; and the degradation effect on tetradecane, hexadecane and naphthalene is better.

The invention relates to the technical field of metal oxides, in particular to manganous-manganic oxide for a lithium ion battery and a preparation method of the manganous-manganic oxide. According to the technology, a double-ligand synergistic complexing system of citric acid-p-phenylenediamine-glutamic acid diacetic acid ammonium salt and citric acid-trioxa-tridecane diamine-glutamic acid diacetic acid ammonium salt is introduced, and coprecipitation is carried out by dropwise adding ammonium bicarbonate in a sectional mode under the conditions that the pH is controlled to be 6 and the temperature is controlled to be 60 DEG C. After precipitation, strict washing is performed, and nitrogen atmosphere prebaking and air roasting are performed to finally obtain manganous-manganic oxide compact spherical particles with high sphericity degree, high tap density and narrow particle size distribution. According to the technology, the bottlenecks of wide particle size distribution, poor sphericity, ion pollution, insufficient densification and the like in the traditional process are solved, the nucleation and crystallization controllability and the secondary agglomeration compactness of the material are remarkably improved, and the coating defect and the dispersion of the material are reduced.

The present invention belongs to the field of pharmaceutical technology, and specifically relates to extracting and separating the 9-oxa-tetracyclic [6.6.1.0 2,6 .0 8,13 ]pentadecane and tetracyclo[5.3.0.1 2,5 .2 4,11 ] two types of heteroterpene compounds of tridecane. The compounds are separated by silica gel column chromatography, ODS column chromatography and HPLC. The present invention also relates to investigating the inhibitory activity of the compounds on acetylcholinesterase. The experimental results show that compared with the positive drug donepezil, IC 50 The value was 1.85±0.03μM. Compounds 1 and 2 showed stronger inhibitory activity against acetylcholinesterase than positive drugs, IC 50 The values ​​were 0.02±0.02μM and 0.31±0.18μM respectively. The present invention enriches the medical use of Daphne koreana in fighting Alzheimer's disease. #imgabs0#

The invention discloses a preparation method and application of high-strength and high-toughness self-repairing polyurethane based on dynamic network reconstruction, and belongs to the technical field of self-repairing materials. The method comprises the following steps: synthesizing a prepolymer from polytetrahydrofuran and isophorone diisocyanate, and carrying out composite chain extension through 1, 3-dihydroxyacetone and 4, 7, 10-trioxo-1, 13-tridecane diamine, so as to form a dynamic hydrogen bond network. Excessive hydrogen bond sites are provided through carbonyl of 1, 3-dihydroxyacetone, dynamic network reconstruction can be carried out under external stress stimulation, and the tensile strength, the ductility and the self-repairing efficiency of the material are synchronously improved. After the dynamic network is reconstructed, fracture and recombination of hydrogen bonds can effectively dissipate strain energy and drive damage repair. The tensile strength of the prepared polyurethane reaches 21.1 MPa, the elongation at break exceeds 1500%, the repair efficiency at 60 DEG C for 12 hours is larger than 90%, and the polyurethane is suitable for the field of flexible intelligent electronic equipment.

The invention relates to a fatty acyl ethanolamine nutritional supplement and application thereof. The main active component of the nutritional supplement is fatty acyl ethanolamine, the fatty acyl ethanolamine is selected from one or more of tridecane acyl ethanolamine, tetradecane acyl ethanolamine and pentadecanoic acid ethanolamine, the purity of the fatty acyl ethanolamine is higher than 95%, and the fatty acyl ethanolamine can be mixed with pharmaceutically acceptable carriers or excipients to be prepared into tablets, capsules, granules or oral liquid and the like. The nutritional supplement provided by the invention can significantly reduce body weight and body fat rate, and increase muscle content and strength at the same time.

The invention discloses porous polycaprolactone microspheres for tissue filling and a preparation method of the porous polycaprolactone microspheres, and relates to the field of biomedical materials. The microsphere is composed of polycaprolactone, the diameter of the microsphere is 40-70 [mu] m, the dispersion coefficient of the microsphere is less than 5%, the porosity of the microsphere is 55-85%, and the surface of the microsphere is provided with a uniform open pore structure formed by tridecane. According to the preparation method, a microfluidic technology is adopted, a tridecane-containing polycaprolactone dichloromethane solution is taken as a dispersion phase, a polyvinyl alcohol aqueous solution is taken as a continuous phase, an oil-in-water emulsion is formed through microchannel shearing, and curing, washing and freeze-drying are performed to obtain the tridecane-containing polycaprolactone / polyvinyl alcohol composite material. The microspheres disclosed by the invention have excellent monodispersity and a porous structure, and can remarkably promote fibroblast proliferation and collagen secretion and induce moderate inflammatory response to activate tissue regeneration. The process is simple and controllable, and the obtained microspheres have injectability and a tissue repair promoting function and have application prospects in the field of soft tissue repair.

The present invention relates to a composition containing natural pyrethrin and a phosphorus-based antioxidant selected from the group P. Group P: tetraphenyldipropylene glycol diphosphite, diisodecylphenylphosphite, diphenyl mono (2-ethylhexyl) phosphite, di-n-decylphenylphosphite, diphenylmono (tridecyl)phosphite, 3,9-bis(nonylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, 2,2'- methylenebis(4,6-di-tert-butylphenyl) 2-ethylhexylphosphite, hydrogenated bisphenol A pentaerythritol phosphite polymer, distearyl pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, and tris(tridecyl) phosphite.

The invention relates to the technical field of insulating cleaning agents, and provides an environment-friendly insulating cleaning agent which comprises an alkane hydrocarbon solvent, a nonionic surfactant, polysiloxane and an inorganic nano functional additive. Wherein the weight percentage of the alkane hydrocarbon solvent is at least 96%, and the alkane hydrocarbon solvent only comprises decane, undecane, dodecane and tridecane. According to the cleaning agent, the alkane hydrocarbon solvent containing four substances is matched with the nonionic surfactant, the polysiloxane and the inorganic nano functional additive, so that the insulation breakdown voltage, the volume resistivity and the open flash point can be improved at the same time under the condition of not containing any environment-unfriendly component; and hot-line work dangers can be effectively prevented. In addition, the cleaning agent not only realizes environment-friendly performance, but also has excellent natural volatility.

A method for producing an acetic acid bacteria-containing composition is provided. The method includes culturing acetic acid bacteria of the genus Acetobacter, collecting the bacteria, and washing the bacteria. The acetic acid bacteria-containing composition includes nonanal, methylheptenone, dimethyl trisulfide, and 2-tridecanone so that the peak area ratio of nonanal to methylheptenone (nonanal:methylheptenone) is 1:10 to 100:1, the peak area ratio of nonanal to dimethyl trisulfide (nonanal:dimethyl trisulfide) is 1:100 to 50:1, and the peak area ratio of nonanal to 2-tridecanone (nonanal:2-tridecanone) is 1:100 to 100:1.

The present invention discloses a thermostable fatty acid photodecarboxylase mutant based on continuous site combinatorial mutation and its application, belonging to the technical field of enzyme engineering. In the present invention, a continuous site combinatorial mutant library was constructed for the fatty acid photodecarboxylase CvFAP derived from Chlorella vulgaris, and an 8-site combinatorial mutant M8 was screened. The optimal reaction temperature of the combinatorial mutant M8 is 45 °C, which is 15 °C higher than that of CvFAP. Moreover, M8 retains 50% activity at 55 °C, while CvFAP has almost no activity at this temperature. The present invention breaks through the limitation that the optimal catalytic temperature of conventional CvFAP is 30 °C and the substrate fatty acid depends on organic solvents such as dimethyl sulfoxide for solubilization. At 55 °C above the melting point of myristic acid and without the assistance of organic solvents for solubilization, the whole cell containing the mutant M8 was used to efficiently catalyze myristic acid to generate tridecane. The present invention provides a prospect for the application of fatty acid photodecarboxylase under high temperature and without organic co-solvent conditions.

The invention discloses a tetrahydroindazole biphenyl fluorescent probe for detecting hydrazine as well as a preparation method and application of the tetrahydroindazole biphenyl fluorescent probe. The fluorescent probe is (3-(4-((2, 5, 8, 11-tetraoxa tridecane-13-oxyl)-4 '-(6, 6-dimethyl-2-(4-nitrophenyl)-4, 5, 6, 7-tetrahydro-2H-5, 7-methylene indazole-3-yl)-1, 1'-biphenyl-3-yl)-2-(pyridine-4-yl) acrylonitrile (TOPIB-PAN for short), and the fluorescent probe has the structural formula shown in the specification. According to the preparation method, 4-((2, 5, 8, 11-tetraoxa tridecane-13-oxyl)-4 '-(6, 6-dimethyl-2-(4-nitrophenyl)-4, 5, 6, 7-tetrahydro-2H-5, 7-methylene indazole-3-yl)-1, 1'-biphenyl-3-formaldehyde (for short, TOPIB-CA) is used as a raw material, the raw material and 4-pyridine acetonitrile are subjected to aldol condensation reaction, and the compound TOPIB-PAN is obtained. The compound TOPIB-PAN can be subjected to a specific reaction with hydrazine, a solution containing the compound emits green fluorescence under the irradiation of ultraviolet light with the wavelength of 365 nm, and the fluorescence color of the solution is changed from green to colorless after hydrazine is added into the solution, so that the compound can be used as a fluorescent probe for detecting hydrazine and has the characteristics of low detection limit (7.9 * 10 <-8 > mol / L), wide pH application range (3-11) and high light stability (gt; 1800 min), and the like, and has a good application prospect.

The invention belongs to the technical field of agricultural planting, and particularly relates to an attractant for millettia migo in foxtail millet and a using method thereof.The attractant is prepared from, by mass, 5-10 parts of foxtail millet leaf extract, 30-40 parts of n-hexane, 1-2 parts of dispersing agent and 1-2 parts of amylodextrin; the foxtail millet leaf extract is prepared from 2-ethyl hexanol, nonanal, 1-octylene-3-ol, myrcene, tridecane, tetradecane and eudesmol. According to the attractant, the foxtail millet leaf extract is used as a main material, and other alcohol, aldehyde and alkene additives are used as auxiliary materials, so that substances with an attraction effect on the foxtail millet can be volatilized and diffused, the attraction force of the attractant on the foxtail millet is far greater than that of foxtail millet seedlings, and the foxtail millet seedlings are prevented from being damaged by the foxtail millet seedlings.

Tick repellents include one or more of 2-methylisoborneol (2-MIB), D-borneol, L-borneol, and a blend of formic acid, undecane, tridecane, (Z)-4-tridecene, heptadecane, (Z)-9-tricosene, pentadecane, (Z)-9-nonadecene, and (Z)-9-heneicosene; and a carrier material. A method of controlling ticks can include dispensing the tick repellent. Personal care products for topical application can include the tick repellent.

Tick repellents include one or more of 2-methylisoborneol (2-MIB), D-borneol, L-borneol, and a blend of formic acid, undecane, tridecane, (Z)-4-tridecene, heptadecane, (Z)-9-tricosene, pentadecane, (Z)-9-nonadecene, and (Z)-9-heneicosene; and a carrier material. A method of controlling ticks can include dispensing the tick repellent. Personal care products for topical application can include the tick repellent.

The invention provides a sheep placenta extract-containing product with anti-aging and repairing effects. Comprising the following components in percentage by weight: 5%-10% of caprylic / capric triglyceride, 3%-8% of hydrogenated lecithin, 1%-3% of silicone oil, 0.2%-0.7% of sorbitan fatty acid ester span-80, 1%-3% of olive oil, 2%-5% of isohexadecane, 2%-5% of undecane, 2%-5% of tridecane, 6%-8% of an amino acid surfactant, 5%-6% of glycerol and 0.2%-0.2% of glycerol. The invention relates to a skin care product which comprises the following components in percentage by weight: 1% of N-isopropylacrylamide, 0.05%-1% of vitamin E, 0.5%-2% of sheep placenta extract, 0.5%-2% of polygonatum sibiricum saponin, 0.5%-2% of pseudo-ginseng extract, 5%-10% of ethanol, 0.05%-0.2% of EDTA (Ethylene Diamine Tetraacetic Acid) and the balance of water. According to the cosmetic emulsion containing the sheep placenta extract, the sheep placenta extract, the polygonatum sibiricum saponin and the panax notoginseng extract serve as functional components, meanwhile, the sheep placenta extract is matched with the N-isopropylacrylamide so that a water-oil film can be formed on the surface layer of the skin, the functional components of the emulsion can act on the skin more effectively, and the anti-oxidation and anti-wrinkle effects can be better achieved.

The invention relates to a method for detecting the porosity of a compound fertilizer. The method comprises the following steps: S1, weighing a compound fertilizer sample to be detected with the weight of m1; s2, mixing the to-be-detected compound fertilizer sample with a solvent, soaking, and then removing the unadsorbed solvent to obtain a solvent-adsorbed compound fertilizer sample with the weight of m2; s3, calculating the porosity of the compound fertilizer sample to be measured; the solvent is selected from one or more of n-tridecane with the CAS number of 629 to 50 to 5, n-tetradecane with the CAS number of 629 to 59 to 4 and kerosene with the CAS number of 8008 to 20 to 6. According to the method, the porosity is calculated by utilizing the absorption amount of a solvent of the compound fertilizer. The method has the advantages of simplicity in operation, easiness in learning, low detection cost and the like; and meanwhile, by adopting the method disclosed by the invention, rapid detection of the porosity of the compound fertilizer can be realized, and the accuracy is relatively high.

The invention provides a marine fungus-derived petroleum degrading enzyme, a gene A5124 and application thereof, belongs to the crossing field of biological enzyme technology and environmental remediation, and provides the marine fungus-derived petroleum degrading enzyme, the amino acid sequence of which is shown as SEQ ID NO.2. The gene A5124 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A5124 of the marine fungus-derived petroleum degrading enzyme has the advantages that the gene A5124 of the marine fungus-derived petroleum degrading enzyme has an amino acid sequence shown as SEQ ID NO.2; the nucleotide sequence of the gene optimized by an escherichia coli codon is as shown in SEQ IN NO. 1; the marine fungus-derived petroleum degrading enzyme provided by the invention can degrade dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, hexadecanoic acid, naphthalene, phenanthrene and pyrene; and the degradation effect on tetradecane, hexadecane, phenanthrene and pyrene is better.

The present invention belongs to the technical field of phosphate preparation, and particularly relates to a method for preparing dihydrogen phosphate. A composite extractant is mixed uniformly with an aqueous phosphoric acid solution and left standing to obtain an extractant loaded with phosphoric acid; wherein, the composite extractant is a mixture of component A, component B and component C, component A is one or more of 3-amino-1-propanol, 3-dimethylamino-1-propanol, 3-amino-1-butanol, 3-dimethylamino-1-butanol or 3-amino-4,4-dimethyl-1-pentanol, component B is one or two of isoamyl alcohol or nonanol, and component C is one or more of normal / isomeric tridecane - normal / isomeric octadecane; the extractant loaded with phosphoric acid is subjected to a metathesis reaction with an aqueous chloride solution, and after layering, an aqueous phase is obtained; the aqueous phase is concentrated and recrystallized to obtain dihydrogen phosphate. The metathesis reaction of the present invention has a high conversion rate, greatly improves the total utilization rate of phosphoric acid and reduces the production cost at the same time.

The present invention discloses and provides a moisturizing and repairing matte lipstick which has good matte effect, is easy to apply evenly, has strong moisturizing ability, and meets the requirements of biodegradability, sustainable development and pure beauty. The moisturizing and repairing matte lipstick of the present invention comprises the following components by weight percentage: 6.0%-10.0% rice bran wax, 8.0%-12.0% calcium carbonate, 4.0%-8.0% jojoba fat, 1.0%-5.0% polycitronellol, sunflower seed wax and cupuacu fruit oil combination, 2.0%-6.0% hydrogenated castor oil, 1.0%-4.0% rice starch, 18.0%-23.0% diisostearyl malate, 0.4%-1.0% caprylyl glycol / ethylhexylglycerin, 19.0%-24.0% isononyl isononanoate, 0.5%-3.0% triethylhexanoin, hydrogenated castor oil / seed acid copolymer, 5.0%-10.0% meadowfoam seed oil, CI15850 1.0%-6.0%, polycitronellol acetate, undecane and tridecane composition 1.0%-5.0%, CI45410 1.0%-6.0%. The present invention is applicable to the technical field of cosmetics.

The invention discloses a long-acting slow-release ice-melting microcapsule and a preparation method thereof, the long-acting slow-release ice-melting microcapsule comprises a core material and a wall material coating the core material, the core material comprises a carrier, and a phase change material and an ice-melting substance loaded on the carrier; the carrier is any one of diatomite, expanded graphite and expanded perlite; the phase change material is at least two of dodecane, tridecane, tetradecane, pentadecane, n-caprylic acid and lauric acid; the ice melting substance is a compound of magnesium nitrate, urea and potassium acetate in a mass ratio of (4-5): (2-3): 1; and the wall material is a polyurethane acrylic acid hybrid. The ice-melting microcapsule provided by the invention only has a slow release function, and the ice-melting substance wrapped in the wall material is slowly released at the temperature of 0 DEG C or below; the adopted ice melting substance does not cause damage to the road and the environment; the adopted wall material is good in weather resistance, so that the wall material of the ice-melting microcapsule is not easy to age, the service life of the whole ice-melting microcapsule is effectively prolonged, and the use timeliness of the whole ice-melting microcapsule is effectively improved.

Tick repellents include one or more of 2-methylisoborneol (2-MIB), D-borneol, L-borneol, and a blend of formic acid, undecane, tridecane, (Z)-4-tridecene, heptadecane, (Z)-9-tricosene, pentadecane, (Z)-9-nonadecene, and (Z)-9-heneicosene; and a carrier material. A method of controlling ticks can include dispensing the tick repellent. Personal care products for topical application can include the tick repellent.

The present invention relates to the field of chemical pharmaceuticals, relates to a crystal form of (3R,11R)-6-fluoro-3,11-dimethyl-10-oxa-2,13,17,18,21-pentaazapentacyclo[13.5.2.18,11.04,9.018,22]tricosan-1(21),4,6,8,15(22),16,19-heptaen-14-one and a preparation method therefor and a use thereof, and specifically relates to a crystal form C of a compound of formula I and a preparation method therefor, solving the problems of small particle size, poor flowability, poor stability, hygroscopicity and the like of the compound of formula I.

The present invention addresses the problem of providing a 2,2-bis(4-hydroxyphenyl)tridecane crystal that has high thermal stability and sufficient fluidity and is suitable for industrial production. As a solution, the present invention provides a 2,2-bis(4-hydroxyphenyl)tridecane crystal that exhibits an endothermic peak with a peak top temperature falling within the range of 84-96°C based on differential scanning calorimetric analysis.

The invention belongs to the technical field of phosphate preparation, and particularly relates to a preparation method of dihydric phosphate. Uniformly mixing the composite extracting agent with a phosphoric acid aqueous solution, and standing to obtain a phosphoric acid-loaded extracting agent; wherein the composite extracting agent is a mixture of a component A, a component B and a component C, the component A is one or more of 3-amino-1-propanol, 3-dimethylamino-1-propanol, 3-amino-1-butanol, 3-dimethylamino-1-butanol or 3-amino-4, 4-dimethyl-1-pentanol, the component B is one or two of isoamyl alcohol or nonyl alcohol, and the component C is one or more of isoamyl alcohol or nonyl alcohol. The component C is one or more of n- / iso-tridecane-n- / iso-octadecane; carrying out double decomposition reaction on the phosphoric acid-loaded extracting agent and a chlorate aqueous solution, and layering to obtain a water phase; and concentrating the water phase, and recrystallizing to obtain the dihydric phosphate. The conversion rate of double decomposition reaction is high, the total utilization rate of phosphoric acid is greatly increased, and the production cost is reduced.