587 results about "Hexene" patented technology

The invention relates to the field of organic synthesis, in particular to a synthetic method of 1-(2, 6, 6-trimethyl-1, 3-cyclohexadiene-1-yl) ethanone, and particularly relates to a synthetic method of 1-(2, 6, 6-trimethyl-1, 3-cyclohexadiene-1-yl) ethanone by taking 4-acetyl-3, 5, 5-trimethylcyclohexene as a raw material and carrying out bromination and elimination steps to synthesize the 1-(2, 6, 6-trimethyl-1, 3-cyclohexadiene-1-yl) ethanone. The method has the advantages of easily available raw materials and high reaction yield, and can be industrially implemented on a large scale.

The present invention relates to the technical field of ethylene oligomerization catalysts, and discloses a ligand compound, a selective ethylene oligomerization catalytic composition and application thereof, and a selective ethylene oligomerization reaction method, the ligand compound has a structure represented by a formula (1) # imgabs0 #, Ar and Ar'are independently selected from substituted or unsubstituted aryl or heteroaryl; 1, 2-positions are substituted or unsubstituted cyclic substituents. The ligand compound is applied to a selective ethylene oligomerization catalytic composition, high ethylene trimerization and tetramerization catalytic activity can be obtained, hexene-1 and octylene-1 selectivity is high, the high-molecular polymer content is low, the risk of scaling and blocking of a reaction pipeline in a continuous reaction can be greatly reduced, and the selectivity of ethylene oligomerization is high. Good industrial application prospects and economic values are realized.

The invention discloses a bacteriostatic food packaging bag and a preparation method thereof, and relates to the technical field of food packaging, the bacteriostatic food packaging bag comprises the following components by weight: 12-22 parts of bamboo fiber; 55 to 80 parts of TPS (Thermoplastic Polystyrene); 15-20 parts of a modified ethylene composite copolymer; 15 to 20 parts of modified chitosan; wherein the modified ethylene composite copolymer is obtained by polymerizing active group-containing ethylene and one of vinyl acetate, butene, hexene or octylene according to a molar ratio of 10: (3-6); the active group is at least one of amino and sulfonic acid group; the modified chitosan is sulfo-grafted chitosan, and the mass grafting rate is greater than 0.1 wt%. The preparation method has the advantages that the compatibility of a composition formula is improved through the modified ethylene composite copolymer and the modified chitosan, a uniform net structure is formed in a cross-linking reaction to serve as a supporting framework, the overall mechanical structure performance is enhanced through the bamboo fibers which are synergistically and uniformly distributed in the composition formula, and the degradable and non-toxic effects are achieved through the cooperation of the bamboo fibers and the TPS.

The invention relates to the field of pouring sealants, and discloses a modified epoxy resin pouring sealant and a preparation method thereof, the pouring sealant comprises epoxy resin, a modified inorganic filler, a modified additive and an auxiliary agent; the modified inorganic filler is prepared by grafting a quaternized s-triazine derivative and an inorganic filler; the quaternized s-triazine derivative is prepared through the steps that 3, 5-diaminophenylboronic acid, cyanuric chloride, 3-chloropropyltrimethoxysilane and 1, 4-butanediamine are sequentially subjected to substitution to prepare a s-triazine derivative, then the s-triazine derivative reacts with N, N-dimethyl-1, 3-diaminopropane, and bromoethane is used for quaternization treatment. The modified additive is prepared from a modified bismaleimide monomer prepared from maleic anhydride and 5 (6)-amino-1-(4-aminophenyl)-1, 3, 3-trimethylindane and 1-methyl-4-isopropyl cyclohexene through a self-stabilization precipitation polymerization method, the prepared pouring sealant is high in tensile strength, good in impact resistance and good in mechanical property, and the prepared pouring sealant has the advantages of being good in mechanical property, good in mechanical property and good in mechanical property. Meanwhile, good heat resistance, flame retardance, dielectricity and antibacterial activity are achieved.

The invention discloses environment-friendly wormwood cloud wool and a preparation method thereof, and relates to the technical field of cloud wool. The preparation method comprises the following steps: adding titanium dioxide powder into an ethyl sorbate solution, coating a polyethyl sorbate film through an in-situ polymerization method, hydrolyzing ethyl sorbate to release carboxyl to obtain modified titanium dioxide powder, and mixing the modified titanium dioxide powder with waste polyester and wormwood powder to form a spinning solution; secondly, N, N, N ', N'-tetramethyl-p-phenylenediamine and 6-iodine-1-hexene are subjected to a reaction to prepare quaternary ammonium salt, double bonds are introduced into a compound, then the compound and 11-mercaptoundecyltrimethoxysilane are subjected to an ultraviolet click reaction, and mercapto modified quaternary ammonium salt is prepared; sulfydryl modified quaternary ammonium salt is used as an antistatic agent to be added into a spinning solution, the environment-friendly wormwood cloud wool is prepared through wet spinning, sulfydryl modification is beneficial to uniform dispersion of the quaternary ammonium salt in the spinning solution, and uneven fiber structure or breakage caused by uneven dispersion of an additive is reduced. The environment-friendly wormwood cloud velvet prepared by the preparation method disclosed by the invention has antibacterial and antistatic effects.

The invention provides a polyethylene composite film. The polyethylene composite film comprises a surface layer, a middle layer and a heat sealing layer which are sequentially stacked, wherein the surface layer is composed of 58%-76% of hexene copolymerized metallocene linear low density polyethylene, 18%-37% of low density polyethylene and a small amount of slipping agent and anti-blocking agent; the middle layer is composed of 79%-88% of octene copolymerized metallocene medium density polyethylene, 5%-21% of hexene copolymerized metallocene linear low density polyethylene and 6%-15% of high density polyethylene; and the heat sealing layer is composed of 47%-65% of hexene copolymerized metallocene linear low density polyethylene, 33%-45% of low density polyethylene and 2%-5% of a tackifier. According to the composite film disclosed by the invention, through gradient design of each layer of material, the whole composite film has rigidity and toughness, and the composite film is particularly suitable for manufacturing stand-up bag packages which stand stably and are compression-resistant and impact-resistant.

The invention relates to the technical field of power cables, and provides a high-toughness corrosion-resistant power cable which comprises a conductor, and an insulating layer, an armor layer and a sheath layer are sequentially arranged on the outer side of the conductor. The sheath layer comprises the following raw materials in parts by weight: 35-45 parts of polyethylene, 35-45 parts of methyl vinyl silicone rubber, 35-48 parts of nitrile rubber, 6-8 parts of a plasticizer, 20-30 parts of filler, 1-2 parts of an antioxidant, 1-2 parts of a vulcanizing agent and 10-13 parts of a functional aid; the functional additive is prepared from the following raw materials: zinc oxide, cinnamic acid and cyclohexenecarboxylic acid. According to the technical scheme, the problem of poor toughness of the sheath layer of the corrosion-resistant power cable in the prior art is solved.

The invention discloses an acid-alkali-resistant high-weather-resistant insulating powder coating as well as a preparation method and application thereof in the aspect of sound screens of high-speed guardrails, and relates to the technical field of fluorocarbon resin powder coatings. The insulating powder coating with acid and alkali resistance and high weather resistance is prepared from the following raw materials in parts by weight: 15 to 25 parts of fluorocarbon resin, 40 to 50 parts of polyester resin, 5 to 12 parts of curing agent, 0.5 to 2 parts of accelerant, 3 to 8 parts of corrosion-resistant agent, 2 to 5 parts of weather-resistant agent, 1 to 2 parts of flatting agent, 0.3 to 1 part of benzoin and 10 to 15 parts of inorganic nano filler. The preparation method comprises the following steps: reacting 4-trifluoromethylphenol with 6-bromo-1-hexene to obtain an intermediate 1, generating an intermediate 2 from the intermediate 1 under the action of m-chloroperoxybenzoic acid, and reacting the intermediate 2 with amino-terminated polyether to generate the corrosion-resistant agent. The acid-base-resistant high-weather-resistant insulating powder coating prepared by the invention has good acid-base resistance, heat aging resistance and light aging resistance.

The present application relates to compositions comprising E-1,1,1,2,2,5,5,6,6,6-decafluoro-3-hexene (E-HFO-153-10mczz, E-CF3CF2CH=CHCF2CF3) processes of preparing such compositions and their use.

The invention relates to the technical field of cyclohexene hydration and catalysts, and discloses a modified ZSM-5 molecular sieve and application thereof in cyclohexanol preparation through cyclohexene hydration. The modified ZSM-5 molecular sieve comprises a ZSM-5 molecular sieve inner core, the inner core is subjected to sulfonation treatment after broaching, and then the surface of the inner core is coated with SiO2 to form a core-shell structure; and carrying out hydrophobic modification on the ZrO2-SiO2 coated SO3H-ZSM-5 molecular sieve, and depositing a zirconium oxide layer on the surface of the ZrO2-SiO2 coated SO3H-ZSM-5 molecular sieve to obtain the ZrO2-SiO2 coated The molecular sieve is used as a catalyst in a cyclohexene hydration reaction, the conversion rate reaches 25% or above, the selectivity reaches 99.5% or above, the activity is still stable after the molecular sieve is recycled 6 times, the catalyst is excellent in catalytic performance, a new thought is provided for a current two-phase catalytic reaction, and meanwhile the molecular sieve is expected to be applied to a cyclohexene hydration industrial device.

The invention provides a composition for luring bactrocera cucurbitae and application thereof, and relates to the technical field of green prevention and control of agricultural pests. The composition comprises the following active ingredients in percentage by weight: 10% of muscovone, 0.1% of heptanal and 0.1% of hexene. The main components of the composition all come from natural plant volatile matters, and the composition is easy to degrade in the natural environment, has no residual risk and is friendly to the ecological environment. Meanwhile, the composition has high safety to bees, pollination insects and other non-target organisms, and ecological side effects possibly brought by traditional chemical attractants are effectively avoided. According to the implementation of the method, an efficient and specific tool is provided for field monitoring of bactrocera cucurbitae populations, the occurrence dynamic of the bactrocera cucurbitae can be accurately mastered, the early warning capability is improved, a new technical path and an implementation basis are provided for promoting green comprehensive treatment of the bactrocera cucurbitae, and the method has good popularization and application prospects.

A method for separating and purifying 4MP1 from a mixture containing 4MTP2 and 1-Hexene comprises the following steps: continuously introducing a solution in which 4MTP2, 1-Hexene and 4MP1 with any concentration are dissolved into a simulated moving bed chromatography system as a raw material solution, collecting a high-purity 4MP1 solution from raffinate of the simulated moving bed chromatography system by adopting a metal organic framework material as a stationary phase, and separating the high-purity 4MP1 solution from the raffinate of the simulated moving bed chromatography system. The extraction liquid is a solution containing impurities 4MTP2 and 1-Hexene. The invention provides a brand new method for separating 4MP1 from 4MTP2 and 1-Hexene, and a complete separation scheme is provided for the prior art; in the separation of high-concentration 4MP1, the relative purity of the separated and purified 4MP1 can reach gt; the recovery rate is gt; and in the separation of low-concentration 4MP1, the rectification level is also exceeded, and the method is more suitable for 4MP1 thermosensitive substances.

The invention belongs to the technical field of catalysts, and particularly relates to application of a non-noble metal supported catalyst in catalytic hydrogenation reaction and a method for catalyzing 5-methyl-3-hexene-2-ketone hydrogenation by using the non-noble metal supported catalyst to obtain methyl isopentanone. The invention provides application of a non-noble metal supported catalyst in catalytic hydrogenation reaction. The non-noble metal supported catalyst comprises a composite carrier and an active component supported in the composite carrier, the composite carrier is aluminum oxide and lanthanum oxide, and the active component comprises iron, cobalt, copper or nickel. The non-noble metal supported catalyst provided by the invention can provide catalytic active site density and electron transfer efficiency which are equivalent to or even better than those of a noble metal catalyst under interaction of an active center structure, electronic characteristics and a carrier; meanwhile, the unique d electron orbital characteristic is beneficial to stabilization of a reaction intermediate and reduction of transition state activation energy, so that the catalyst cost is remarkably reduced while the selectivity of catalytic hydrogenation is remarkably improved.

The invention discloses a 27.5 KV positive feeder insulation coating material and a preparation method thereof, and relates to the field of coatings. The 27.5 KV positive feeder insulation coating material prepared by the invention is prepared by the following steps: reacting furan with 6-bromo-1-hexene to obtain a comonomer, and reacting the comonomer, polytetrafluoroethylene and ethylene to obtain a copolymer; the preparation method comprises the following steps: protecting maleic anhydride by furan, reacting with 3-aminopropyl methyl dimethoxy silane, performing deprotection to obtain modified silane, and reacting the modified silane with octamethylcyclotetrasiloxane to obtain polysiloxane; the copolymer, the modified polysiloxane, the antioxidant 1010 and methylbenzene react to prepare a base material, and then the base material, the coupling agent and the wear-resistant agent are evenly mixed and discharged to prepare the wear-resistant coating. The 27.5 KV positive feeder insulation coating material prepared by the invention has good tensile strength and self-repairing performance, can realize self-repairing under a heating condition, and prolongs the service cycle of the material.

The invention relates to the technical field of petroleum drilling fluid loss reduction, and discloses an anti-divalent salt fluid loss agent for drilling fluid, which is prepared by the following steps: step 1, beta-cyclohexylamine and 6-chloro-1-hexene are subjected to a reaction to obtain alkenyl beta-cyclohexylamine; step 2, initiating polymerization of alkenyl beta-cyclopentadiene, a hyperbranched monomer pentaerythritol triallyl ether and 2-acrylamide-2-methylpropanesulfonic acid under the action of azobis (isobutylamidine hydrochloride), so as to obtain an intermediate A; 3, 3-dimethylamino-1-propylamine and palmitic acid are subjected to a reaction, and an intermediate 2 is obtained; 4, the intermediate 2 and benzyl chloride are subjected to a reaction, and quaternary ammonium salt modified fatty acid is obtained; and 5, stirring and mixing the intermediate A, quaternary ammonium salt modified fatty acid and coupling agent modified walnut powder to obtain the divalent salt resistant filtrate reducer for the drilling fluid. The anti-divalent salt filtrate reducer for the drilling fluid has a relatively good anti-divalent salt effect.

The invention relates to the technical field of microcapsules, in particular to watermelon essence and a preparation method thereof. The watermelon essence is composed of a composite core material and a wall material, the composite core material comprises a watermelon aldehyde pre-clathration core material, cis-3-hexenol, trans-2-hexenal, beta-ionone, leaf acetate and other flavor substances, and the wall material is coated with a pre-clathration layer and a composite nano layer from inside to outside in sequence. The three-stage process of reducing high-temperature volatilization loss in the preparation process through watermelon aldehyde pre-clathration, realizing precise cladding through nano-emulsification and preparing micro powder through spray drying and curing is adopted, so that the three problems of thermal instability, poor slow release property and high cost existing in the field of watermelon essence for a long time are solved, and the watermelon essence has the advantages of high embedding rate, uniform particle size distribution, low cost and the like. The effects of resisting high-temperature processing and prolonging the slow release property are achieved.

An integrated process for producing E-1,1,1,2,2,5,5,6,6,6-decafluoro-3-hexene and uses of the products produced in this process.

The invention discloses a sandwich structure catalyst for preparing adipic acid through cyclohexene oxidation based on a metal organic framework material, and belongs to the technical field of chemical synthesis, the structure of the catalyst is as follows: magnetic iron oxide nanospheres are loaded with heteropolyacid nanodots, and the outer layer is coated with a porous metal organic framework shell. The catalyst has excellent magnetic recovery performance, large specific surface area and open pore channels, and has the advantages of high catalytic activity, easy recovery, stable structure and the like. The excellent performance shows that the sandwich structure catalyst has important application value in reactions for preparing adipic acid through cyclohexene oxidation and the like.

This invention discloses a method for synthesizing a venetum intermediate, specifically as follows: Step 1: In an organic solvent, 2,4-difluorobenzoic acid and 5-hydroxy-7-azaindole undergo an etherification reaction under the action of an acid-binding agent. After the reaction, post-treatment yields 2-((1h-pyrrolo[2,3-b]pyridin-5-yl)oxy)-4-fluorobenzoic acid; Step 2: 2-((1h-pyrrolo[2,3-b]pyridin-5-yl)oxy)-4-fluorobenzoic acid reacts with 1-((2-(4-chlorophenyl)-4,4-dimethylcyclohexene-1-)methyl)piperazine in… An amination reaction occurs under the action of a base. After the reaction, post-treatment yields 2-(7-azaindole-5-oxy)-4-(4-((2-(4-chlorophenyl)-4,4-dimethylcyclohexene-1-)methyl)piperazine-1-)benzoic acid, i.e., Venetantora intermediate III. The synthetic process provided by this invention avoids Grignard reactions and subsequent hydrolysis reactions, shortens the operation steps, simplifies the synthetic process, and provides a simple and easy-to-operate synthetic process. The raw materials are inexpensive and readily available, while avoiding the use of highly toxic raw materials. The production process is green and environmentally friendly, and suitable for industrial production.

This invention relates to the field of organic synthesis technology and discloses a method for preparing 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylic acid ester, comprising the steps of: S1, providing raw material: 3-cyclohexenecarboxylic acid-3′-cyclohexene methyl ester; S2, epoxidation reaction: mixing the raw material with hydrogen peroxide, a composite catalyst, and a buffer to obtain a reaction solution containing the target product; S3, separation and purification: allowing the reaction solution to stand and separate into layers, separating the organic phase, washing with water, drying, and vacuum distilling to obtain 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylic acid ester. This method for preparing 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylic acid ester uses hydrogen peroxide as the oxygen source, resulting in no heavy metal pollution, low wastewater volume, and conforming to the trend of green chemistry. The composite catalyst requires a small amount, has high activity and good selectivity, can be recycled ≥5 times, reducing costs, requiring less equipment, and is highly safe. The product is colorless and transparent, with a high epoxy value, purity ≥98.5%, low acid value, and good stability.

Systems and methods of producing 1-hexene are disclosed. The methods include oligomerizing ethylene to produce 1-hexene in a reactor unit, which involves flowing a first solvent system into the reactor unit, the first solvent system adapted to improve selectivity of 1-hexene in the oligomerizing of the ethylene. The methods can include flowing part of a second solvent system into the reactor unit under washing mode, the second solvent system adapted to dissolve by-products in the reactor unit being washed. The methods can include flowing part of a second solvent system into the catalyst preparation unit, the second solvent system adapted to dissolve catalysts in the catalyst preparation step. The systems can include a reactor, a wax / polymer removal unit, and at least two C6 distillation columns in series for producing 1-hexene.

The present invention uses a two-pack adhesive composition which is constituted from: a first agent containing at least one non-aromatic epoxy compound selected from among an aliphatic epoxy compound having a hydroxyl group and two or more epoxy groups and a cyclohexene oxide-based epoxy compound, an aromatic epoxy compound, rubber particles and an ionic liquid; and a second agent containing at least one curing agent selected from among an amine-based curing agent having two or more amino groups in the molecule, an acid anhydride-based curing agent, a phenol-based curing agent, a mercaptan-based curing agent and a polysulfide-based curing agent, and in which the ratio of the non-aromatic epoxy compound and the aromatic epoxy compound falls within a certain range.

The application discloses a preparation method of beta-carotene, which comprises the following steps: 3-methyl-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4-pentadienyl triphenyl phosphonium salt (C15 phosphonium salt) cis-trans isomer and 2,7-dimethyl-2,4,6-octatriene-1,8-dial (C10) are dissolved in a water and a water incompatible solvent system, and Wittig reaction is generated under the action of an alkali. The reaction system can avoid that by-product inorganic salt is wrapped in the product, and the content of inorganic salt impurities in the product is reduced. In addition, the proportion of C15 phosphonium salt cis-trans isomer is controlled, a C15 phosphonium salt hydrolysis side reaction is inhibited, and the reaction yield is improved.

[Problem] To provide a means capable of more efficiently exerting an antibacterial effect against bacteria. [Solution] An antibacterial agent containing at least two compounds selected from the group consisting of trans-2-methyl-2-pentenal, 2-methylbutanal, trans-2-hexenal, propionaldehyde, 3-methylpentanol, and 2,5-dimethylfuran.

The present invention relates to a multilayer film comprising: an inner layer system comprising a first surface and a second surface; a first skin layer adhered to the inner layer system at the first surface of the inner layer system; and a second skin layer adhered to the inner layer system at the second surface of the inner layer system; wherein the inner layer system consists of a polymer formulation (A), wherein the polymer formulation (A) comprises: > 60.0 and < 90.0 wt% of a first ethylene-based polymer which is a linear low density polyethylene A (LLDPE A); and > 10.0 and < 40.0 wt% of a high density polyethylene (HDPE) having a density > 940 and < 970 kg / m 3 , preferably > 955 and < 970 kg / m 3 ; measured according to ASTM D792 (2008); and the first and / or second skin layer is a sealing layer comprising a second ethylene-based polymer which is a linear low density polyethylene B (LLDPE B) comprising polymerized moieties derived from ethylene and 1-octene or 1-hexene having a density > 890 and < 915 kg / m 3 , preferably > 900 and < 915 kg / m 3 , measured according to ASTM D792 (2008); preferably, wherein the sealing layer comprises > 70.0 wt% of the second ethylene-based polymer, or wherein the sealing layer consists of the second ethylene-based polymer; wherein the multilayer film is a biaxially oriented film, wherein the biaxial orientation is introduced in solid state. This film allows the production of a sealed package having a sufficiently high seal strength at reduced sealing temperature (also referred to as seal initiation temperature) which at the same time has improved tensile properties, such as an improved tensile modulus in machine and transverse direction and an improved tensile strength in machine and transverse direction, which has proven.

The invention relates to the technical field of olefin polymerization, and discloses a catalyst for olefin polymerization, a preparation method of the catalyst and an olefin polymerization method. The catalyst is a coordination compound and has a structure shown in a formula (1), and L is selected from O, S or-NH-; m is selected from Ti, Zr, Hf, Cr, Ni or Fe; x is selected from a substituted or unsubstituted C1-C20 oxygen-containing group, F, Cl, Br or I; n is an integer of 2-6; and m is an integer of 1-4. The catalyst can efficiently catalyze ethylene monomer homopolymerization to selectively prepare linear alpha-olefin, is especially suitable for selective preparation of 1-hexene and / or 1-octene, has high catalytic activity and good catalytic stability, and can co-produce 1-hexene and 1-octene with high selectivity. # imgabs0 #

A method of selectively producing oligomers can include contacting at least one antifouling agent with a first amount of at least one aluminum alkyl compound to form at least one antifouling compound comprising the following structure or dimer form thereof: (I); and adding the at least one antifouling compound, an additional amount of the at least one aluminum alkyl compound, the at least one titanate compound, and ethylene to a jet loop reactor to oligomerize the ethylene to produce one or more of 1-butene, 1-hexene, or 1-octene. (I)

The invention belongs to the technical field of fine chemical engineering, and relates to a method for preparing high-purity n-heptanoic acid and n-nonanoic acid based on temperature control phase transfer catalysis and green oxidation. The method comprises the following steps: adding dehydrated 1-hexene or 1-octene, a PETPP / Rh catalyst, toluene / water and PEG-400, introducing a CO / H2 mixed gas to 4.5-5.0 MPa, carrying out a reaction, carrying out phase splitting, and carrying out molecular distillation on an organic phase to obtain an n-heptanal crude product or an n-nonanal crude product; and carrying out electrolysis in an electrolyte containing MnSO4, AgNO3 and H2SO4, and purifying the reaction solution to obtain n-heptanoic acid or n-nonanoic acid. No heavy metal pollution is generated in the reaction process, the concentration of manganese ions in the wastewater is lower than 0.05 ppm, and the COD value is 30 mg / L or below. The activity of the catalyst is kept above 90% after the catalyst is cyclically used for more than 20 times, the electrolyte can be repeatedly used for more than 50 times, and the recycling rate of the by-product hydrogen exceeds 85%.

The invention provides a polylactic acid composite material and a preparation method thereof. The polylactic acid composite material comprises the following components in parts by mass: 50-90 parts of polylactic acid, 5-50 parts of bio-based polycarbonate, 5-15 parts of an impact modifier and 0.1-3 parts of a chain extender, wherein the bio-based polycarbonate has the following structural unit: in the bio-based polycarbonate, R1 is selected from cyclohexenyl and-(CH2) n-, and n is equal to 0-6. The material provided by the invention also has good toughness and heat resistance on the basis of environmental friendliness.

The invention discloses a preparation method of beta-carotene. The preparation method comprises the following steps: dissolving an aqueous solution of 3-methyl-5-(2, 6, 6-trimethyl-1-cyclohexene-1-yl)-2, 4-pentadienyl triphenylphosphine salt (C15 phosphine salt) and 2, 7-dimethyl-2, 4, 6-octtriene-1, 8-dialdehyde (C10) cis-trans isomer in a solvent, carrying out wittig reaction under the action of alkali, and carrying out isomerization to obtain the product. By controlling the proportion of C10 cis-trans isomers of the reaction system, the content of the C25 aldehyde intermediate can be reduced, and the reaction yield and the product quality can be improved.