127results about "Preparation by ozonolysis" patented technology

The invention discloses a preparation method of natural benzaldehyde. The method comprises the following steps of: getting cinnamyl aldehyde or cinnamon oil as a raw material; adding one or more of multi-phase catalysts of 0.5% to 10% of MnO2, TiO2, Al2O3, SnO2, Fe2O3, MgO, CuO, CeO2, ZrO2, Bi2O3, Y2O3 or active carbon; pouring 0.05 to 0.5g of ozone in a bubbling reactor at -5 to 20 DEG C based on 1g of cinnamyl aldehyde per hour; carrying out an ozonization reaction for 0.5 to 10 hours to obtain an ozonide intermediate; dropping the ozonide intermediate into the thiourea aqueous solution to be reduced while agitating at a constant low temperature, so as to obtain an oil-water mixture; separating the oil from the water to obtain a rough benzaldehyde product; and finally operating a molecular distillation device to obtain the benzaldehyde with relatively high purity. The preparation method has the advantages of simple technology, green reaction, being capable of remaining the natural property of the benzaldehyde, high selectivity, and high yield of the benzaldehyde.

A method for producing ozone for use in ozonolysis reactions. Oxygen is separated from the mixture of ozone and oxygen from an ozone generation unit and is fed back to the oxygen feed to the generation unit. Nitrogen is fed to the ozone separation unit and the mixture of nitrogen and ozone is fed to the ozonation reactor where the ozone will react with organic compounds to produce desired end products.

Methods are provided for making reversible crosslinked polymers. Exemplary methods comprise reacting first and second thermoplastic polymers having non-hindered olefins in the presence of a metathesis catalyst under conditions sufficient to form a crosslinked polymer. In certain embodiments, the methods comprise providing a crosslink promoting additive to improve the strength of the crosslinked polymer. In some embodiments, the methods comprise decrosslinking a crosslinked polymer through a metathesis or an ozonolysis reaction.

The invention discloses a preparation method of natural benzaldehyde by ozone collaborative heterogeneous catalysis of cinnamaldehyde or cinnamon oil. The method is as below: adding 0.5%-10% of aNiO, BaO, MgO, La2O3, SnO2 binary or ternary oxide component catalyst into a raw material cinnamic aldehyde or cinnamon oil, introducing ozone in a bubble reactor under conditions of atmospheric pressure temperature of -10 to 30 DEG C and flow rate of 0.1-5 g/L, and reacting at low temperature for 1-8 h to obtain a benzaldehyde crude product; and finally, using a molecular distillation apparatus to obtain high-purity natural benzaldehyde. The invention has the advantages of simple process, convenient operation, no toxicity or harm of the catalyst, environment-friendliness; the cinnamaldehyde is fully utilized; and the benzaldehyde has good selectivity, high yield, and natural degree intact.

The invention relates to a (4R)-4-methyl-2-carbonyl valerate compound with a methyl chiral functional group. The compound is prepared by converting waste (2R,4R)-2,5-dyhydroxyl-4-methyl potassium valerate which is oxidatively degraded by steroidsapogenin. The method is easy and convenient to operate, not only can improve the utilization rate of the steroidsapogenin, but also reduces pollution of waste of sterides degradation to the environment.

The invention relates to a method for the ozonolysis of unsaturated fatty acids and derivatives thereof, comprising a) ozonolysis of a fatty acid or of a derivative thereof in an organic phase comprising an organic solvent, and b) contacting the organic phase with an aqueous phase comprising catalase and preferably a buffer, where the fatty acid or the derivative thereof has a linear chain having at least eight carbon atoms, and the use of catalase for removing reactive oxygen species from a reaction mixture comprising ozonolysis products of an unsaturated fatty acid.

The invention discloses a method for oxidizing styrene. According to the method, the styrene comes into contact with an oxidant under the condition of oxidation reaction. The method is characterized in that the oxidant is an ozone-containing gas. According to the method, the phenylacetaldehyde selectivity is high, and the selectivity of styrene oxide is greatly improved in the presence of a titanium-containing catalyst.

The invention discloses a method for preparing anisaldehyde. The method comprises the following steps: (1) mixing anethole, organic solvents and water to obtain reaction materials; adding the reaction materials into a bubble reaction tower and introducing mixed gas of ozone and oxygen to carry out ozonization reaction; continuing introducing oxygen to expel redundant ozone after the ozonization reaction is over to obtain ozonization reaction liquid; and (2) heating anhydrous sodium sulfite solution to 60-80 DEG C and dropwise adding the ozonization reaction liquid to carry out reduction reaction; continuing reacting for 30-60min after dropwise adding the ozonization reaction liquid, cooling and standing the reactant and dividing the liquid to obtain the coarse anisaldehyde; and removing the organic solvents by distillation to obtain the anisaldehyde product. The method avoids a little side reaction in the process of ozonization, lowers the equipment and production cost, solves the keyproblems confronted by industrialized production, such as equipment corrosion due to presence of acetic acid, heavy environmental pollution and the like, and opens up a way for large-scale industrialized production.

The invention provides a cyclohexanol oxidation method, which includes allowing cyclohexanol to contact an oxidant under oxidation reaction conditions, wherein the oxidant is ozone-containing gas. The inventive method can oxidize cyclohexanol into cyclohexanone in the absence of catalyst by using ozone as oxidant, with simple process and high selectivity of target product.

The invention discloses a supergravity reaction device and application thereof, belongs to the technical field of fine organic synthesis, and solves the problems existing in existing preparation processes of benzaldehyde and benzoic acid. According to the invention, fluid is greatly sheared and crushed through a supergravity rotating packed bed and a high-speed rotating packing, a huge and rapidlyupdating phase interface is generated, and the microcosmic mixing and mass transfer process is greatly enhanced. Ozone is selected as an oxidizing agent, and the device has the advantages of greenness, high efficiency, no secondary pollution and the like. Low-toxicity low-boiling-point reagents such as dichloromethane and ethyl acetate are selected as solvents, and recycling is facilitated. The method has the advantages of being environmentally friendly, high in atom economy and the like, and has wide industrial application prospects.

The invention discloses a preparation method of anisic acid, which comprises the following steps: taking a right amount of crude sulfate turpentine, and fractionating to obtain crush anethole; carrying out crystallizing separation on the anethole to obtain the high-purity anethole; adding the high-purity anethole and a NaHSO3 solution into a reaction kettle, and introducing ozone to perform oxidation for 110 minutes, thereby obtaining an anisic aldehyde sodium sulfite addition product A; simultaneously and slowly adding a sodium hydroxide solution and oxydol into A, stirring to react for 5.0-9.0 hours while keeping at 65-85 DEG C to obtain a reaction product B; and after the reaction is finished, adding a HCl solution into B to regulate the pH value to 1-3, and filtering to obtain the anisic acid. The method has the advantages of high yield and high purity and does not use any organic solvent in the separation process, so the product has no toxic or harmful solvent residue and can be used in the industries of medicine, food and cosmetics; the method has the characteristics of mild reaction conditions, simple purification and refinement and high product purity, and is simple to operate; and by using the ozone and oxydol as oxidizers, the reaction product is water, so the oxidizers are green and environment-friendly.

The present invention relates to a catalytic process for preparation of isolongifolene using nanocrystalline solid super acid. This process is an eco-friendly, single step, solvent free catalytic process for the preparation of a tricyclic sesqui-terpene hydrocarbon, isolongifolene. More particularly, the present invention provides a process for the catalytic isomerisation of longifolene to iso-longifolene using nano-crystalline sulfated zirconia as a solid super acid catalyst.

A method for preparing vanillin through a sodium isoeugenol process relates to the technical field of the chemical industry. The method comprises the following steps: mixing sodium isoeugenol and water, adding the obtained mixture into an oxidation reaction kettle, carrying out an oxidation reaction, connecting with a vent pipe to input ozone, increasing the ozone rate to drive the stirring and overturning of a liquid in the oxidation reaction kettle in order to carry out a liquid phase oxidation reaction, layering the liquid obtained after the liquid phase oxidation reaction, adding a sodium sulfite solution to decompose ozonides, neutralizing the ozonides, washing with water to obtain crude vanillin, adding to a refining kettle, carrying out refining crystallization, drying to obtain finished vanillin, packaging and warehousing. The method has the advantages of convenient and simple preparation, environmental protection, no pollution, less equipment investment, high purity and convenient operation, and the prepared vanillin has the advantages of good use effect, safety and reliability.

The invention disclosed relates to the detection of the Emerald Ash Borer (EAB), Agrilus planipennis Fairmaire (Coleoptra: B-prestidae) and in particular to the use of contact sex phenomones therefor. Analyses of the elytral hydrocarbons from male and female emerald ash borer, that were freshly emerged vs. sexually mature (>10 days old) revealed a female-specific compound, 9-methyl-pentacosane (9-Me-C₂₅), only present in sexually mature females. This material was synthesized by the Wittig reaction of 2-decanone with (n-hexadecyl)-triphenylphosphonium bromide followed by catalytic reduction to yield racemic 9-Me C₂₅, which matched the natural compound by GC/MS (retention time and EI-mass spectrum). In field bioassays with freeze-killed sexually mature A. planipennis females, feral males spent significantly more time in contact and attempting copulation with unwashed females than with females that had been washed in n-hexane to remove the cuticular hydrocarbons. Hexane-washed females to which 9-Me-C₂₅ had been reapplied elicited similar contact time and percentage of time attempting copulation as unwashed females, indicating that 9-methyl-pentacosane is a contact sex-pheromone component of A. planipennis. This is the first contact sex pheromone identified in the Buprestidae.