498 results about "Citral" patented technology

Pesticides for the extermination of terrestrial arthropods are disclosed which comprise formulations of a combination of terpenes in aqueous solutions which may be used together with citral. No resistance to the formulations of the invention has been seen. When used on the scalp or body for lice infestation no extended dwell time is required. The formulations do not have unpleasant odors. The formulations are directed towards providing topical preparations which may be used on the skin, scalp and hairy body parts of humans and animals, sprays for use directly against terrestrial arthropods, a dipping solution for combs and a laundry additive, amongst others.

The invention relates to an antibacterial deoxidizing double-effect food preservative, which is formed by combining a deoxidizer component with a bacteriostat component, wherein the deoxidizer component accounts for 60-90 percent, and the bacteriostat component accounts for 10-40 percent. The bacteriostat component comprises an adsorption carrier and an antibacterial solution. The adsorption carrier comprises salep, silicon dioxide, vermiculite, diatomaceous earth, zeolite, bentonite, fiber, etc. The antibacterial solution comprises one of or the composite mixture of edible alcohol and propylene glycol. Antibacterial synergist comprises allyl isothiocyanate, allicin, cinnamic aldehyde, cinnamic acid, carvacrol, eugenol, thymol, citral, etc. The antistaling agent integrates double protection functions of absorbing oxygen, sterilizing and inhibiting bacteria, which is remarkable in preservation effect and wide in application range.

The present invention provides a liquid detergent composition, comprising: (a) a cleaning effective amount of an enzyme preferably selected from a proteolytic enzyme, an amylolytic enzyme, a lipolytic enzyme, a cellulolytic enzyme and mixtures thereof; (b) from 0.001 to 3% by weight of a perfume composition, not containing a perfume component selected from the group consisting of saturated and unsaturated linear aldehydes, lilial, cyclal c, vanillin, citral, cinnamic aldehyde, pulegone, terpinolene, gamma terpinene, alpha methylionone; (c) from 0.002 to 1% by weight of an antioxidant; and (d) a fatty acid soap in an amount of at most 4% by weight. Said detergent composition was found to have favourable storage stability characteristics.

Oral products containing citral for oral cleansing, breath freshening and anti-microbial benefits. The oral products of this invention are dentifrices, chewing gums, confections, mouthwashes, mouth sprays and edible thin film products. In effective amounts, citral is delivered in an oral product for convenient oral cleansing and breath freshening benefits.

The invention belongs to the technical field of chemical industry, and relates to a citral liquid-phase hydrogenation method for synthesizing unsaturated alcohol. The method comprises the following steps: using a platinum catalyst loaded on ferric oxide as the catalyst for synthesizing the unsaturated alcohols in a citral optional hydrogenation way, adding the citral and the catalyst in mass ratio into normal hexane, and carrying out the reaction in an FCZ-1 magnetic high-pressure reaction kettle. The optionality of the prepared catalyst for catalyzing generation of unsaturated alcohols is better than that of the traditional loaded platinum catalyst. The invention is simple to operate, the citral liquid-phase hydrogenation is completed in one step, and thus, the technique is simple. The invention realizes optional regular regulation and control on geraniol and nerol. As the content of Pt gradually increases, the optionality of the nerol is obviously increased, and the optionality of the geraniol is gradually decreased.

The invention relates to a natural plant cleaning agent. The natural plant cleaning agent is characterized in that: the natural plant cleaning agent is prepared by uniformly mixing the following components in part by weight at the temperature of between 15 and 25 DEG C: 70 to 80 parts of limonene, 2 to 10 parts of tea saponin, 1 to 10 parts of lecithin, 2 to 10 parts of citral and 0.5 to 1 part of citric acid. The natural plant cleaning agent has no any damage to a paint film, glass and the like of automobiles and home appliances, avoids the phenomenon of delamination after emulsification, and improves the cleaning effect. The natural plant cleaning agent is safe and environment-friendly and has strong detergency, a simple process and low cost.

The invention relates to an air purifying agent, which is characterized by comprising the following components in proportion by weight: 0.001-0.01% of zingiberone, 0.005-0.05% of zingiberol, 0.015-0.05 % of menthol, 0.01-0.03 % of menthone, 0.02-0.04%of phellandrene, 0.01-0.03% of pinene, 0.005-0.02% of terpineol, 0.02-0.05%of citral, 0.002-0.01% of octyl aldehyde, 0.002-0.01% of pelargonic aldehyde, 0.02-0.05% of geraniol, 0.01-0.03% of linalool and 0.005-0.02% of hydratropic aldehyde. The air purifying agent of the invention is prepared by compounding pure natural plant juice and belongs toa pure natural product which has no toxicity, irritation and explosiveness. Compared with the chemical deodorizer used for deodorization in the existing market, the air purifying agent has better safety, and products obtained by reaction of the air purifying agent and odor do not have secondary pollution.

The industrial preparation method of high-purity beta-ionone is characterized by that 1. regulating dose of acetone, water and alkali to make the condensation reaction of citral and acetone be implemented under the condition of approaching to homogeneous phase, its reaction condition is moderate, reaction time is short and yield is high; 2. when the pseudo ionone is undergone the process of cyclization, at the same time the carbon dioxide ice is added so as to effectively prevent reaction system from local overheating and make the selectivity for forming beta-ionone be greater than 99%. Said invention can obviously raise product quality and yield, in the product the beta-ionone content is greater than or equal to 96.0%, alpha-ionone content is less than or equal to 1.0% and the yield is up to 72.0-85.0%.

The invention discloses a plant essential oil composition for fumigating and killing grain aspergillus flavus. The composition is prepared by utilizing plant or plant essential oil containing cinnamic aldehyde, citral, thymol and salicylaldehyde or by utilizing synthetic identical materials, wherein the parts by weight of the four components in the composition are respectively as follows: 5-20 parts of cinnamic aldehyde, 15-35 parts of citral, 35-60 parts of thymol and 10-35 parts of salicylaldehyde. The composition has the advantages that: the drawing materials are natural, safe and non-toxic; and the volatile essential oil components are easy to diffuse; and the gas of the volatile essential oil is used for fumigating and killing to ensure that the composition needs not be in direct contact with grains and only needs to be put at a corner of a warehouse or a closed container to play a role in efficiently killing the grain aspergillus flavus.

The invention discloses a gas-phase sustained-release mildew-resistant antistaling agent and a preparation method and application thereof. The gas-phase sustained-release mildew-resistant antistaling agent is prepared through complex formulation of microcapsules of four plant essential oils consisting of anethole, cinnaldehyde, citral and salicylaldehyde. Beta-cyclodextrin is used as a wall material to respectively encapsulate the four plant essential oils consisting of anethole, cinnaldehyde, citral and salicylaldehyde, so four plant essential oil microcapsules are obtained; then the four plant essential oil microcapsules are mixed in proportion and then are applied for mildew-resistance and preservation of grains or oil-bearing materials or for mildew-resistance and preservation of raw-food materials and packaged foods. The mildew-resistant antistaling agent inhibits mould through gas-phase fumigating effects of the essential oils and employs microcapsule technology for controlling of volatilization speeds of the essential oils, so a long-acting gas-phase mildew-resistant effect is realized without direct contact between the essential oils with grains, foodstuffs and the like; the mildew-resistant antistaling agent is especially applicable to antibiosis and mildew-resistance of grains, oil-bearing materials and packaged foods under the conditions of high temperature and high humidity, can suppress deterioration of quality of the grains, the oil-bearing materials and the packaged foods, is safe to human beings and livestock and is capable of effectively overcoming the problem of residual of a chemical fumigant.

The invention belongs to the technical field of agriculture animal husbandry and food antitoxin and detoxication, and relates to mycotoxin adsorbent and a preparation method thereof. The mycotoxin adsorbent is composed of, by weight, 85-90% of montmorillonite, 5-7% of yeast cell walls, 1-3% of chitin, 1-2% of saccharomyces boulardii and 3-5% of natural plant extract in a mixing mode. The natural plant extract comprises tea tree oil, hesperidin, eugenol, citral, cinnamaldehyde and baicalein which are proportionally mixed. The mycotoxin adsorbent can be applied to fodder, aflatoxin B1 in the mycotoxin can be absorbed, other mold toxins such as zearalenone, ochratoxin, deoxynivalenol and fumitremorgin can also be effectively absorbed, the nutrient absorption rate of the fodder is low, meanwhile, breeding and balancing of probiotics in intestinal canals can be promoted, and the immunocompetence of animals is enhanced.

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 invention relates to a method for selective hydrogenation synthesis of nerol and geraniol mixture by using citral in a water-organic two-phase system. High selectivity of unsaturated alcohol cannot be easily obtained by the traditional selective hydrogenation method of a plurality of citrals. The method is characterized by comprising the following steps of: taking water soluble complex formed by the VIII-group water soluble metal salt and water soluble ligand as a catalyst, wherein the mass ratio of the water soluble salt of the VIII-group metal to the water soluble ligand is (0.001-0.01):1; carrying out selective hydrogenation on the citral in the water-organic two-phase system, stewing and layering after reaction is ended; continuing to mechanically apply the water phase containing the catalyst to the next reaction, wherein the organic phase is mixture of nerol and geraniol. The method is simple in process, high in conversion ratio of reaction, and high in selectivity; the catalyst has high activity and stability, and can be mechanically applied for a plurality of times in cycle; the cost is reduced when pollution is reduced; the method is suitable for industrial production.

The invention discloses a method for preparing a melissa officinalis L. essential oil and beta-cyclodextrin molecule microcapsule and aims to improve the physical and chemical properties and the stability of the melissa officinalis L. essential oil and expand the application range of the melissa officinalis L. essential oil. The method comprises the following steps of: adding ethanol solution of the melissa officinalis L. essential oil into saturated aqueous solution of beta-cyclodextrin slowly, wherein the molar ratio of citral in the melissa officinalis L. essential oil to beta-cyclodextrin is 1:2, and the volume ratio of the melissa officinalis L. essential oil to ethanol is 3:100; oscillating the solutions for 3 hours at a rotating speed of 160r / min at the temperature of 30 DEGC for complete reaction, preserving a product of reaction at the temperature of 4 DEG C for 4 hours, standing, and precipitating; and filtering the obtained solution, and drying a precipitate at the temperature of 50-70 DEG C for 4 hours to obtain the melissa officinalis L. essential oil and beta-cyclodextrin molecule microcapsule. By encapsulating beta-cyclodextrin and the melissa officinalis L. essential oil, the powder of the molecule microcapsule has extremely good optical and thermal stability; the range of application of the melissa officinalis L. essential oil is expanded; and the method is simple and highly practical.

This invention aims at providing a catalyst for producing an optically active aldehyde or an optically active ketone, which is an optically active carbonyl compound, by carrying out selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, particularly a catalyst which is insoluble in a reaction mixture for obtaining optically active citronellal which is useful as a flavor or fragrance, by carrying out selective asymmetric hydrogenation of citral, geranial or neral; and a method for producing a corresponding optically active carbonyl compound. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table is supported on a support, an optically active cyclic nitrogen-containing compound and an acid.

The invention relates to a kumquat essence, which comprises the following components: 0.1-100 parts of essence base, 0-99.9 parts of dissolvent, 0-20 parts of surfactant, 0-20 parts of cosurfactant and 0-99.9 parts of carrier. The essence base comprises the following components in parts by weight: 10-40 parts of green mandarin oil, 0.05-0.2 parts of capraldehyde, 0.1-0.5 parts of citronellal, 0.3-1 parts of citral, 10-35 parts of mandarin oil, 10-35 parts of tangerine oil, 0.1-1 parts of thymol and 0.1-4 parts of linalool. The formulation of the kumquat essence of the invention adopts essences with strong affinity and natural equivalent ingredients to kumquat juice as raw materials, and employs natural green mandarin oil as the main ingredient of the essence base, so that the drinks and other foods added with the kumquat essence have enhanced juice effect and have natural fragrance and taste.

The invention belongs to the technical field of cigarette filter stick production and particularly to a cigarette blast bead tangerine peel-flavored essence and application of the same to cigarettes. The cigarette blast bead tangerine peel-flavored essence is composed of tangerine peel extract, acetic acid, sweet orange oil, maltol, citral, and glyceryl caprylate-caprate. The cigarette blast bead tangerine peel-flavored essence can be applied to preparing a tangerine peel-flavored cigarette blast bead. The tangerine peel-flavored cigarette blast bead can be applied to a filter stick to prepare blast bead cigarettes. According to the cigarette blast bead tangerine peel-flavored essence and the application of the same to the cigarettes and through combination with a relatively complete blast bead production process, cigarette blast bead products stable and uniform in quality can be obtained. When arranged inside a cigarette filter tip, the cigarette blast bead can well weaken irritancy of the cigarettes, improve and enrich the flavor of the cigarettes, and significantly improve the flavor richness, the sensory quality and the smoking enjoyment of the cigarettes. Therefore, the cigarette blast bead tangerine peel-flavored essence and the application of the same to the cigarettes are high in application value and generalization and application significance to design, development, production and marketing of blast bead cigarettes.

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 invention discloses a method for preserving litchi by using plant essential oil. The method comprises the following steps: selecting the litchi fruit which is harvested in sunny day, 80%-90% matured, and free from mechanical damage and diseases and insect pests; soaking the litchi fruit in a 25-500 mu L / L of citral or clove leaf oil solution for 0.5-5 minutes; and then precooling, packing andstoring the soaked litchi fruit, wherein after harvesting, the litchi fruit disease mainly comprises fugus diseases such as peronophythora litchi, sour rot, anthracnose and the like, and enzymatic browning of the phenolic compounds and the degradation / discoloration of the anthocyanin are one of the main reasons causing the peel browning. In the method, the litchi fruit which is harvested in proper time and good in state is soaked in the citral or clove leaf oil solution so as to effectively inhibit the fruit rot and the peel browning of the litchi fruit and maintain the quality of the fruit; and in a low temperature condition, the litchi fruit treated by the method disclosed by the invention in completely good condition is more than 95% after 30 days, the control to the peel browning is good, and the original quality of the fruit can be basically maintained.

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 citral, geraniol, nerol, perillaldehyde, α-terpineol, dodecanol and L-carvone.

The invention relates to a method for preparing citronellol by directly reducing citral by an intermittent hydrogenation method. Multiple kinds of catalysts with high selectivity and production methods are disclosed in the prior art, but the problems of high cost, low operability and the like are not completely solved. In a reaction system, citral is used as a raw material and an M2 metal-skeleton-shaped alloy solid is used as a catalyst; the reaction system also comprises an aqueous solution of amine substances and a non-polar solvent; and the citral is selectively reduced to a citronellol crude product by hydrogen by the intermittent hydrogenation method, and the citronellol crude product is rectified under reduced pressure to form a citronellol fine product. In the method, the hydrogen, oil, water and catalyst four-phase reaction system is established, and the cheap M2 catalyst achieves high selectivity which can be achieved by a noble metal catalyst by adding the non-polar solventand the aqueous solution of amine substances and combining the molecular structure characteristics of citral; and reaction conversion rate reaches 99.3 percent, and reaction selectivity is over 96 percent.

Improved aromachemical derivatives, and fragrances and flavorings including the derivatives, that have a longer useful shelf life than the aromachemicals from which they can be derived, are disclosed. In particular, the derivatives maintain the fragrance characteristics of the aromachemicals, while lowering the allergic properties, increasing the stability, and / or increasing the odor intensity. Also disclosed are methods of making the derivatives, and articles of manufacture including the derivatives. In one embodiment, the derivatives are prepared by replacing one or more double bonds in citral with a thioether, cyclopropyl, oxirane, or thiirane group. The cyclopropane ring can be unsubstituted, or substituted with one or two lower alkyl, preferably methyl groups. The alkyl groups can optionally be substituted, for example, with electron donating groups, electron with drawing groups, groups which increase the hydrophilicity or hydrophobocity, and the like. In another embodiment, the derivatives are prepared by replacing the aldehyde group in the essential oil with a nitrile, methyl ether or acetal group. The acetal groups can provide the compounds with a long lasting flavor or fragrance, where the acetals slowly hydrolyze to provide the aldehyde group in the parent essential oil. In some embodiments, both the aldehyde and at least one of the double bond functional groups are both derivatized as described herein. Examples of suitable articles of manufacture include candles, air fresheners, perfumes, disinfectant compositions, hypochlorite (bleach) compositions, beverages such as beer and soda, denture cleanser tablets and flavored orally-delivered products such as lozenges, candies, and the like.

The invention relates to a spice-threshold-value-based flowery flavor type tobacco essence and a blending method thereof. The spice-threshold-value-based flowery flavor type tobacco essence is prepared from, by weight, 1-50% of flavor base and 50-99% of solvents, wherein the flavor base is prepared from, by weight, 0.1-10 parts of beta-damascone, 0.1-5 parts of linalool, 0.1-20 parts of nerol, 0.03-15 parts of benzyl alcohol, 0.1-10 parts of geraniol, 0.02-20 parts of phenethyl alcohol, 0.1-2 parts of farnesyl acetone, and 0.1-3 parts of beta-cyclization citral. The flowery flavor type tobacco essence is added into cut tobacco, the conventional technology is adopted for manufacturing a cigarette product, and a sensory evaluation test result shows that compared with an empty sample with no flowery flavor type tobacco essence, the cigarette product with the flowery flavor type tobacco essence becomes good in fragrance and obvious in flowery flavor, the remaining taste is improved, and offensive odor is covered.

Disclosed are personal care compositions, including compositions for oral, throat and skin care comprising a blend of naturally occurring flavor or perfume ingredients or essential oils containing such ingredients, wherein the blend provides excellent antimicrobial activity and comprises at least two components, a first acyclic component selected from citral, neral, geranial, geraniol and nerol and a second cyclic-containing component selected from eucalyptol, carvacrol and eugenol. Preferably, the blend comprises 3, 4, 5 or more of the above components. Greater synergy in terms of antimicrobial efficacy may be obtained the more different components are blended together. The present compositions are effective in killing, suppressing the growth of and / or altering metabolism of microorganisms including those which cause undesirable oral cavity conditions including plaque, caries, calculus, gingivitis, periodontal disease and malodor. Optionally the blend further comprises additional antimicrobial and / or anti-inflammatory components, preferably naturally-occurring as well.

The invention provides electronic cigarette tar which comprises the following components by mass percentage: 90-99% of atomized liquid and 1-10% of coca cola essence, wherein the coca cola essence comprises the following components in parts by weight: 0.1-2 parts of alpha pinene, 0.1-2 parts of beta pinene, 1-30 parts of limonene, 1-10 parts of sweet orange oil, 1-20 parts of lemon oil, 0.1-0.5 parts of myrcene, 0.1-2 parts of cinnamic aldehyde, 0.1-5 parts of cinnamon oil, 0.1-10 parts of citral, 0.1-5 parts of geranial, 1-10 parts of geranyl acetate, 0.1-5 parts of sinensal, 1-10 parts of citronellol, 1-10 parts of geranyl propionate, 0.1-5 parts of eugenol allylguajacol, 0.1-2 parts of ethyl maltol, 0.1-3 parts of furanone, 0.1-5 parts of raspberry ketone, 1-25 parts of cinnamyl alcohol, 1-10 parts of cinnamyl acetate, 1-15 parts of vanillin, 1-15 parts of ethyl vanillin and 0.1-2 parts of coffee extract. The electronic cigarette tar with a coca cola taste is rich and plump in fragrance, and can achieve an effect similar to a pleasant feeling brought by drinking coca cola. The invention further provides a preparation method of the electronic cigarette tar. The method is simple and easy to operate, and is suitable for industrial production.

The invention discloses a preparation and use method of a momordica grosvenori and honey domesticating and luring agent. The preparation and use method comprises the following steps: firstly, preparing a bee domesticating agent by taking momordica grosvenori flower extracts, citral and cane sugar as main raw materials, and then, preparing a bee luring agent by taking the citral and the cane sugar as the main raw materials; providing the bee domesticating agent for swarms within 10-20 days before the flowering phase of momordica grosvenori to train the swarms to be accustomed to the smell of the bee domesticating agent with a momordica grosvenori flower component; stopping using the bee domesticating agent after the flowering phase of the momordica grosvenori comes; and filling the bee luring agent into a handheld sprayer, and spraying the bee luring agent at the inner sides of flowers as accurate as possible at sunrise to lure bees to pay a visit and pollinate. According to the method disclosed by the invention, the artificial pollen pollination for the momordica grosvenori is replaced with a bee domestication and bee lure combined way, and natural pollen pollination of the dioecious momordica grosvenori which is non-attractive, free of nectar glands on flowers and incapable of secreting fragrant honey substances can be finished with the active help of the bees, so that the labor strength for pollen pollination during the flowering phase of the momordica grosvenori is remarkably reduced, the production efficiency is increased, and the production cost is reduced.

The invention discloses a preparing method of citral. The existing method has high production cost or low yield, thus being difficult to be suitable for scale production. The method adopts dehydrogenated linalool as a raw material which is carried out with catalytic reforming to obtain the citral under the existence of a solvent and a latent solvent and is characterized in that: a catalyst adopted for reaction is molybdenum dioxide diacetyl acetone acid ester, the catalytic reforming is carried out under the existence of acid cocatalyst which is cationic exchange resin with subacidity. The catalyst and the acid cocatalyst improve the reaction yield; in addition, the catalyst and the cocatalyst can be recycled for treatment and conveniently applied mechanically, and the castlyst is environmental friendly.

The invention discloses an aurea helianthus flower mud facial mask and a preparation method therefor. The facial mask comprises the following raw materials, by weight, 20-30% of aurea helianthus flowers, 20-30% of luffa flowers, 5-8% of propylene glycol, 0.3-0.7% of carbomer, 1.0-1.5% of triethanolamine, 0.05-0.1% of EUXYL K300 and 0.002-0.005% of citral, the balance being luffa stem nutritious water. The preparation method for the facial mask comprises the following steps: firstly, luffa stem nutritious water is disinfected and filtered for stand-by; secondly, flowers are crushed and stirred into mud for stand-by; thirdly, carbomer is subjected to swelling in the luffa stem nutritious water; fourthly, a carbomer gel matrix is prepared; fifthly, citral is dissolved in propylene glycol, then the luffa stem nutritious water is added, and a solution I is obtained; sixthly, the solution I and the flower mud are added in the gel matrix, then EUXYL K300 is added, the mixture is stirred and mixed uniformly, and an aurea helianthus flower mud facial mask is obtained. The facial mask has whitening and moisture retention fuctions and has no side effects.

The invention discloses a hydrogenation catalyst and a preparation method thereof, and a method for preparing citronellal by citral hydrogenation. The hydrogenation catalyst comprises a rare earth hydride, a metal oxide and Pd. Under the action of the hydrogenation catalyst, preferably in the presence of an N-heterocyclic compound additive, citral is hydrogenated to prepare citronellal. The hydrogenation catalyst has the advantages of CO poisoning resistance and long service life, reduces the possibility that citral is subjected to aldehyde group decomposition to generate CO, inhibits the poisoning probability of the active component Pd, and has a good industrial prospect.