294 results about "Citronellal" patented technology

The invention provides a carbon supported core-shell structure nano metal catalyst as well as a preparation method and application thereof. The carbon supported metal catalyst with the core-shell structure is obtained by compounding layered double-metal hydroxides containing cobalt and nickel and beta-cyclodextrin and self-reducing the compound in situ at a high temperature by means of the reducibility of generating carbon at the high temperature of the beta-cyclodextrin; the carbon supported metal catalyst with the core-shell structure can be expressed as M/ZnO-Al2O3/C; and the core of the carbon supported metal catalyst is formed by nano metal M (M is Co or Ni), and the shell of the catalyst is formed by ZnO and little amorphous Al2O3; amorphous carbon serves as the catalyst carrier; the grain sizes of the core-shell structure nanoparticles are distributed in the range of 15-40 nm; and the specific surface area of the catalyst is 150-350 m<2>/g. The carbon supported metal catalyst is applied to hydrogenation reaction of citronellal and shows excellent activity; and the carbon supported metal catalyst has high selectivity for the product citronellal.

An object of the present invention is to provide a method for manufacturing an optically active menthol having fewer steps, which generates less environmentally polluting waste because a catalytic reaction is involved in all of the steps, and is capable of saving a production cost. The present invention relates to a method for manufacturing an optically active menthol, including the following steps: A-1) asymmetrically hydrogenating at least one of geranial and neral to thereby obtain an optically active citronellal, B-1) conducting a ring-closure reaction of the optically active citronellal in the presence of an acid catalyst to thereby obtain an optically active isopulegol, and C-1) hydrogenating the optically active isopulegol to thereby obtain an optically active menthol.

The invention relates to a catalyst, which is applicable to the selective liquid phase catalytic hydrogenation of Alpha, Beta-unsaturated carbonyl compounds to make corresponding unsaturated carbonyl compounds or unsaturated alcohol, being especially suitable for the selective hydrogenation of citral to make citronellal and/or citronellol. The catalyst of the invention is a metal component loaded on a structured composite nano carbon fiber, wherein, the metal component is selected from one of or a plurality of nickel, ruthenium, rhodium, palladium and platinum. The components of the catalyst are: 1) structured substrate, such as metal foam, honeycomb ceramic, carbon felt and ceramic fiber; 2) nano material coating, such as nano carbon fiber; 3) metal active component, such as nickel, ruthenium, rhodium, palladium and/or platinum. The invention effectively avoids deep reaction, thus enhancing the target product selectivity. The catalyst is prefabricated into a variety of shapes and installed in a reactor, so that the catalyst, the liquid phase reactants and the solution are easy to be separated, thus meanwhile reducing the loss of the catalyst.

The purpose of the present invention is to provide antiseptic disinfectant, and cosmetics and toiletries, medicine or food containing the same, which enhance the antibacterial activity that 1,2-alkanediol originally have against a broad range of strains by compounding 1,2-alkanediol with 5-10 carbons and a certain fragrance component. The present invention relates to an antiseptic disinfectant, and cosmetics and toiletries, medicine or food containing the same, which include 1,2-alkanediol with 5-10 carbons, and one or more materials selected from a group of thymol, eugenol, citronellal, terpinyl acetate, citronellol and β-pinene.

The invention relates to a high dispersion supported nano noble metal catalyst and a preparation method and application thereof. The preparation method comprises the following steps of: simultaneously compositing and reducing in one step under solvothermal condition based on an MgAl laminated double metal hydroxide of metal coordination ionic intercalation with palladium and platinum to obtain high dispersion amorphous carbon and laminated double metal hydroxide supported high dispersion noble metal Pd or Pt nano catalyst; applying to citral selective hydration to reaction for preparing citronellal or citronellol; and displaying excellent activity and high selectivity to products citronellal and citronellol. The catalyst is novel and unique in structure, green and energy-saving in process and strong in stability, and has wide application prospect.

The present invention relates to diarylphenoxyaluminum compounds which are obtainable by reacting a bis(diarylphenol) ligand of the formula (I)

with an alkylaluminum compound and/or a complex aluminum hydride.

The invention moreover relates to the use of such diarylphenoxyaluminum compounds as catalysts.

Moreover, the invention relates to a method of producing isopulegol by cyclization of citronellal in the presence of diarylphenoxyaluminum compounds as catalysts.

The invention also relates to a method of producing menthol by cyclization of citronellal in the presence of diarylphenoxyaluminum compounds as catalysts and subsequent hydrogenation.

The invention discloses a method for asymmetric synthesis of levorotation menthol. The method comprises the following steps: citral is taken as an initial raw material, a dihydropyridine derivant is taken as a negative hydrogen source, chiral amine serves as a chiral auxiliary agent for catalytic and asymmetric hydrogenization synthesis of dextrorotation citronellal, the dextrorotation citronellal is catalyzed by Lewis acid for ring-closing synthesis of levorotation isopulegol, and the levorotation isopulegol is subject to catalytic hydrogenation to finally produce the levorotation menthol. The total yield of the levorotation menthol produced by adopting the method is larger than 60 percent, and the ee (enantiomeric excess) value is larger than 90 percent. The method has the characteristics of mild reaction conditions, simple synthetic process, simplicity in catalyst preparation, convenience in catalyst recovery and the like and is suitable for large-scale industrial production of levorotation menthol.

The present invention relates to a process for the preparation of isopulegol of formula (I):

comprising the cyclization of citronellal of formula (II):

in the presence of a tris(aryloxy)aluminum catalyst, wherein the cyclization is carried out in the presence of

I. at least one acid and/or

II. at least one compound selected from the group comprising carboxylic anhydrides, aldehydes, ketones and vinyl ethers.

The invention discloses a novel method for disinfecting cultural relics by fumigation, which can be applied to prevention and control of pest mildew diseases of collected and exhibited cultural relics by a museum. The method is characterized in that flammable, combustible, environment-polluted and toxic fumigants such as ethylene oxide, bromomethane and the like are replaced by one or more out of safe, nontoxic and environment-friendly plant fumigants such as cinnamyl aldehyde, citronellal, geranialdehyde and the like, and composite high-purity nitrogen is used for fumigating the cultural relics, so that the efficacy of plant components can be improved; the temperature and the humidity during fumigation are adjusted, so that the cultural relics made of different materials are maintained under a relatively stable condition, and damage to the main bodies of the cultural relics is avoided.

The invention discloses a catalyst for synthesizing pinane by hydrogenating alpha-pinene and a preparation method. The catalyst comprises the following components by mass percent: 15-20% of amorphous-state NiB alloy, 20-30% of ZrO2 and 50-65% of Al2O3. The preparation method comprises the following steps: combining a supported nano ZrO2/Al2O3 composite carrier with the amorphous-state NiB alloy; fully utilizing the surface property of the composite carrier and the amorphous-state hydrogenation activity; and directly preparing the amorphous-state NiB alloy on the ZrO2/Al2O3 composite carrier to form a dual-function NiB/ZrO2/Al2O3 catalyst. The catalyst is also used for synthesizing the alpha-pinane by hydrogenating the alpha-pinene. The invention has easily obtained raw materials and simple preparation process; and the hydrogenation product, namely the pinane is a transparent oily liquid with mild pine needle smell which can derive twenty to thirty terpene spices, and is a main raw material for synthesizing spices and medicine intermediates such as dihydromyrcene, linalool, citronellol, citronellal and the like.

The invention discloses a method for preparing L-menthol, which comprises the following steps:(1) reacting d-citronellal in a solvent in the presence of a catalyst, and collecting isopulegol from the reaction product, wherein the catalyst is a zinc-bromide-modified NaY molecular sieve; and carrying out high-pressure hydrogenation on the obtained isopulegol to obtain the target product L-menthol. The obtained isopulegol can be subjected to high-pressure hydrogenation to obtain the target product L-menthol without purification. The invention has the characteristics of mild reaction conditions, high stereoselectivity, high yield and the like, and is simple to operate; and the catalyst is simple to recover, and can be used repeatedly. The method disclosed by the invention avoids the problems of difficulty in product purification, low yield and the like in the traditional synthesis technique of the compounds, and greatly lowers the production cost.

The present invention provides a pediculicidal and ovicidal composition with an extraordinarily lethal effectiveness that can also be used to remove parasites, such as lice. The pediculicidal and ovicidal composition contains a purified terpene agent such as citronellal, citronellol, citronellyl or a mixture thereof, a short chain alcohol, and a non-aqueous co-solvent and/or surfactant component. The composition more preferably utilizes citronellyl acetate as the active agent. The compositions can be administered topically to humans, animals or any infested areas.

The invention relates to melamine derivative modified waterborne polyurethane flame-retardant anti-microbial resin and a preparation method thereof. The resin contains the following components in parts by weight: 8.0-18.0 parts of polyisocyanate, 2.0-5.0 parts of polyhydric alcohol, 1.5-3.0 parts of a polyamine type chain extender, 4.0-12.0 parts of polyether polyol, 1.5-3.0 parts of dimethylolpropionic acid, 0.01-0.1 part of dibutyltin dilaurate, 2.5-4.0 parts of a melamine derivative, 4.0-10.0 parts of acetone, 1.0-3.0 parts of a neutralizer, 1.5-3.0 parts of ethanol and 50.0-68.0 parts of deionized water, wherein the melamine derivative is prepared through reaction of melamine and citronellal hydrate. The melamine derivative modified waterborne polyurethane flame-retardant anti-microbial resin has the characteristics of good adhesive force, corrosion resistance, water resistance, alkali resistance, simplicity in construction, good flame retarcance and antibacterial property, high hardness and the like, can be widely applied to the ocean field, iron components and wood coatings and has huge utilization potentialities.

The invention discloses an asymmetric synthesis method of dextral citronellal. The method takes citral as a starting material, dihydropyridine derivative as a negative hydrogen source, and chiral amine salt as a chiral auxiliary agent, and asymmetric hydrogenation reaction is generated in a bi-catalytic system to synthesize dextral citronellal. By adopting the synthesis method disclosed by the invention for the synthesis of dextral citronellal, the total yield is more than 85%, and the ee (enantiomeric excess) value is greater than 80%; the synthesis method has the characteristics of mild reaction conditions, simple synthesis process, simple catalyst preparation, convenience in recycling and the like, and is suitable for industrial production of dextral citronellal.

The invention relates to high-barrier environmental-friendly coating lined paper and a manufacturing method thereof. The lined paper comprises following three layers: a stone paper layer, an ink layer on the surface of the stone paper layer and a high-barrier layer on the surface of the ink layer. The gram weight of the stone paper base material is 55-80 g/m2. The ink layer is a coating formed by drying aqueous soybean ink. The barrier layer is a coating formed by coating base material paper with modified polyvinyl alcohol coating and drying. The modified polyvinyl alcohol coating is prepared by polymerization of following raw materials by weight: 4-7% of polyvinyl alcohol, 5-9% of carbon nanofiber, 3-6% of citronellal, 3-7% of a catalyst, 2-7% of a defoaming agent and 70-79% of softened water. The lined paper has characteristics of excellent barrier performance, good stiffness and strength, capability of environmental protection and low production cost, and can fully replace traditional composite lined paper or aluminized lined paper.

Certain components of citrus fruits and oxidation products of limonene are effective deterrents, repellents and/or spatial inhibitors for mosquitoes and biting midges. The compounds that have been found to be deterrents, repellents and infibitors for mosquitoes and biting midges are neryl acetate, citronellyl acetate, geranyl acetate, hydroxy-p-cymene, citral, α-terpineol, citronellal, linaloyl acetate, citronellol, terpen-4-ol, tetrahydrocarvone, products of oxidized oxidized limonene inclusive of d- and l-carvone, (+) limonene oxide, (−) limonene oxide, cis and tran carveol, a diol and an aldehyde, and mixtures thereof.

The invention relates to a method for preparing chiral citronellal through citral catalytic asymmetric hydrogenation in the technical field of chemical engineering. Under the effect of additives such as sodium iodide, tetraoctyl ammonium bromide and phenyltriethylammonium chloride, E-type and/or Z-type citral is catalyzed by chiral rhodium complex and asymmetrically hydrogenated into R or S chiral citronellal. In addition, E-type or Z-type citral can be catalyzed into chiral citronellal of the same required structure by changing chirality of chiral catalysts. Thus, citral of all structures can be completely converted into chiral rhodium of one required structure. The reaction method is mild in condition, easy and convenient to operate, capable of achieving good reaction yield and reaction efficiency and good in application effect.

An enzymatic citral asymmetric reduction method capable of increasing optical purity of (R)-citronellal is disclosed, namely a method coupling an amino-acid-catalyzed citral cis-trans isomerization reaction and a citral asymmetric hydrogenation reaction catalyzed by a saccharomyces cerevisiae enol reductase OYE1 to increase the optical purity of the (R)-citronellal that is a product of citral hydrogenation. When citral cis-trans isomers are subjected to the asymmetric hydrogenation reaction catalyzed by the saccharomyces cerevisiae enol reductase OYE1 to synthesize the (R)-citronellal, the (R)-citronellal is derived from trans-citral, (S)-citronellal is derived from cis-citral, and the catalysis speed for the trans-citral is higher than that for the cis-citral. Through coupling with the amino-acid-catalyzed citral cis-trans isomerization reaction, a part of the cis-citral is converted into the trans-citral, thus greatly increasing the ee value of the product that is the (R)-citronellal. In a catalytic system having a volume of 10 mL, 100 mg/mL of glycine is added, after 50 mM citral is subjected to a catalytic reaction for 4 h, the ee value of the (R)-citronellal is 65.4%, and is increased by 48.7% when being compared with the ee value of (R)-citronellal when the cis-trans isomerization reaction is not coupled.

The invention discloses a catalyst for selectively hydrogenating an ethylenically unsaturated carbonyl compound as well as a preparation method and application of the catalyst. The catalyst comprises,on the basis of the weight of a carbon carrier, 0.05 to 10 wt% of ruthenium, 0.05 to 5 wt% of molybdenum and 0.05 to 5 wt% of iron, as a preferred embodiment, ruthenium is modified by nitrogen. The catalyst is especially suitable for preparing citronellal and/or dihydrocitronellal through high-selectivity hydrogenation of citral, and preparing dihydrocitronellal through high-selectivity hydrogenation of citronellal. The catalyst can inhibit the formation of aldehyde substance dimerization, significantly reduce the adsorption of CO, enhance the CO poisoning resistance, and significantly improve the stability in the reuse process.

The invention relates to an environment-friendly coating, in particular to a water-based paint with a mosquito repelling effect and a preparation method thereof. The raw materials for preparation of the water-based paint with a mosquito repelling effect contains a citronellal solution, which is prepared from citronellal and a 97%-99% ethanol solution in a weight part ratio of 10-40:60-90. The raw materials for preparation of the paint also include water, a dispersant, a wetting agent, a defoaming agent, a thickening agent, titanium dioxide, a pH regulator, heavy calcium carbonate, kaolin, talc powder, an emulsion, a coalescing agent, an antifreezing agent, a mildewproof agent and a leveling agent. The water-based paint provided in the invention has a mosquito expelling effect, and is harmless to the human body, also can purify indoor air properly, and can meet the requirements of indoor decoration.