60 results about "Nonanal" patented technology

The invention relates to a preparation method of nonanal and methyl formylcaprylate. The method comprises the following steps: epoxidized methyl oleate is used as a raw material to react under the action of catalyst and generate nonanal and methyl formylcaprylate, wherein the reaction temperature is 40-100 DEG C, the pressure is atmospheric pressure; the mesoporous molecular sieve which is treated with 10-35% hydrogen peroxide is taken as a carrier for the catalyst, the weight ratio of tungsten used as main catalyst to the weight of the carrier is 0.005-0.1, and the weight ratio of one of titanium and molybdenum, used as cocatalyst to the weight of the carrier is 0-0.1. The invention has the following beneficial effects: by adopting the technical scheme that the reaction temperature is 40-100 DEG C, the pressure is atmospheric pressure; the mesoporous molecular sieve is taken as a carrier for the catalyst, tungsten is used as a main catalyst and titanium or molybdenum used as cocatalyst is added or not, the problem can be solved well. The preparation method provided by the invention has mild reaction conditions, low cost and higher product yield and is suitable for industrial production.

The invention discloses a method for preparing nonanal by adopting a loop reactor. According to the method, n-nonanal is prepared through an octene hydroformylation reaction;1-octene, hydrogen and carbon monoxide are used as raw materials, triphenylphosphine tri-m-sulfonic acid sodium salt and rhodium chloride are used as catalysts, and octene hydroformylation reaction is carried out. A water / oil / gas three-phase reaction interface is increased through the loop reactor; the mass transfer rate among reaction raw materials 1-octene, synthesis gas (hydrogen and carbon monoxide) and a catalyst aqueous solution is increased; the conversion rate of the hydroformylation reaction is improved, the design parameters and related process parameters of the core part venturi ejector of the loop reactor are optimized, the conversion rate of octene is further improved, and the selectivity of n-nonanal in the product is improved.

The invention belongs to a new process for synthesizing natural identical perfume nonanal. The method comprises the following steps: mixing and stirring 36 grams of trichloroiminocyanuric acid, 580 milliliters of trichloromethane, 33 grams of calcium oxide and 75 grams of nonanol; dripping 20 milliliters of trichloromethane solution containing 0.4 gram of trolamine while stirring the solution, keeping on stirring the solution at a temperature of 40 DEG C to react for 4 hours; adding 0.3 gram of trolamine and 15 grams of trichloroiminocyanuric acid into the solution, and keeping on stirring at 40 DEG C to react for 2 hours; removing solid from the reaction solution, washing the solution to neutrality by liquid, recovering organic solvent, distilling the obtained organic solvent by decompressing to 0.097MPa, and obtaining the fraction at boiling point of 102 DEG C, which is the final product. The method of the invention prepares the nonanal by the new process with high conversion rate, no pollution and easy industrial operation.

The invention relates to the field of fermentation, and discloses saccharomyces cerevisiae, a leavening agent, a preparation method of the leavening agent, application of the leavening agent in preparation of fermented food, and a beer preparation method, wherein the preservation number of the saccharomyces cerevisiae is CGMCC No.21162. According to the invention, the saccharomyces cerevisiae disclosed by the invention is strong in passage capacity, the 10-generation fermentation performance of beer is stable, and the autolysis rate of the saccharomyces cerevisiae does not exceed 5%; beer brewed by the saccharomyces cerevisiae is stable in flavor and low in content of undesirable flavor substances such as yeast flavor, diacetyl flavor and trans-2-nonanal and the like, and aging of the beer can be effectively delayed; and the saccharomyces cerevisiae can also be used for fermenting flour products.

The invention discloses a synthesis method of Z9,11-dodecadienol acetate. The synthesis method comprises the following steps: (1) by taking 1,9-nonanediol as a raw material, performing unilateral oxidation to synthesize 9-hydroxyl-1-nonanal; (2) synthesizing an intermediate Z9,11-dodecadienol; (3) synthesizing the Z9,11-dodecadienol acetate. The synthesis method has the advantages of mild synthesis conditions, short reaction time, easy operation, wide application range, high yield, low cost and easy industrialization, the process flow is shortened, and three wastes are few. In a synthesis reaction of the 9-hydroxyl-1-nonanal, silica gel is added, the dispersion of PCC (Pyridinium Chlorochromate) is facilitated, the opportunity of oxidation of two hydroxyls is reduced by adding the PCC in batches, the reaction is performed at room temperature, and energy is saved; after the reaction is completed, ethyl ether and water are added for extraction, and the yield of reactants is improved. In the synthesis process of the Z9,11-dodecadienol, a phase transfer catalyst 18-crown ether-6 and non-polar solvent benzene are adopted to react so as to obtain a cis-product; meanwhile, weak alkali potassium carbonate is adopted, so that the protection of the hydroxyls of the 9-hydroxyl-1-nonanal is avoided, and a reaction synthesis route is shortened.

The invention relates to a dendrobium officinale flower fragrance composition, a preparation method and application thereof, and relates to the technical field of daily chemicals. According to the main technical scheme, the dendrobium officinale flower fragrance composition is prepared from a fragrance compound and a solvent auxiliary material, wherein the fragrance compound is prepared from 1-octylene-3-alcohol, hexanal, nonanal, phenylacetaldehyde, octanal and linalool, and in the dendrobium officinale flower fragrance composition, the concentration of the 1-octylene-3-alcohol is 9.9 mg / L to 12.4 mg / L, the concentration of the hexanal is 26.7 mg / L to 31.5 mg / L, the concentration of the nonanal is 3.8 mg / L to 4.2 mg / L, the concentration of the phenylacetaldehyde is 18.8 mg / L to 20.6 mg / L, the concentration of the octanal is 1.2 mg / L to 1.4 mg / L, and the concentration of the linalool is 7.2 mg / L to 8.4 mg / L. The invention is mainly used for providing and preparing the dendrobium officinale flower fragrance composition. The dendrobium officinale flower fragrance composition has the natural fragrance characteristic of dendrobium officinale flowers. The dendrobium officinale flower fragrance composition is used for preparing daily chemicals such as spices, essences, cosmetics, perfume, detergents and the like so as to endow the daily chemicals with the dendrobium officinale flower fragrance characteristic.

The invention relates to the field of daily use chemicals, and particularly discloses daily use chemical essence with fruit fragrance and a preparation method thereof. The daily use chemical essence is prepared from an organic solvent, peach aldehyde, nonanal, myricetin and methyl cedryl ether. The preparation method comprises the following steps: mixing the organic solvent, peach aldehyde, nonanal, myricetin aldehyde and methyl cedrol, and stirring for 30-40 minutes under the conditions that the temperature is 25-35 DEG C and the rotating speed is 80-100 r / min, thereby obtaining the daily chemical essence with fruit fragrance. The daily use chemical essence with the fruit fragrance has the advantage of being low in sensitization rate; in addition, the preparation method disclosed by the invention has the advantage that the fragrance sensitization rate is lower.

A mosquito attractant composition is described comprising heptanal, octanal, nonanal, (E)-2-octenal and (E)-2-decenal. More particularly a composition wherein the compounds are present in the following proportions: nonanal 1.00, octanal 0.32±0.16, heptanal 0.06±0.03, (E)-2-octenal 0.04±0.02 and (E)-2-decenal 0.13±0.065.

The invention relates to red ginseng essence. The red ginseng essence is prepared from the following components: 2-acetylpyrazine, methyl cyclopentenolone, maltol, ethyl vanillin, edible alcohol, propylene glycol, acetic acid, ethyl acetate, butanol, acetaldehyde diethylacetal, ethyl butyrate, ethyl lactate, furfural, leaf alcohol, 2-acetylfuran, 0.07 kg of ethyl acetoacetate, 5-methylfurfural, 2-ethyl-3-methylpyrazine, benzyl alcohol, 2,3,5,6-tetramethylpyrazine, nonanal, 2-methoxy-3-(1-methylpropyl)pyrazine, [gamma]-octanoic lactone, 5-hydroxyethyl-4-methylthiazole, eugenol, ascabiol and a red ginseng extract. According to the red ginseng essence, a formula is formulated according to inherent aroma compounds in natural red ginseng, spice with high affinity to the red ginseng and naturalequivalent components is selected as a raw material, and the red ginseng extract is added to blend the red ginseng essence, so that the flavor of final products of foods and beverages can be effectively enhanced.

Flavor compositions which reduce or prevent dental cavities based on the use of flavor materials found to inhibit the production of acid by micro-organisms in the oral cavity, e.g. lactic acid production from glucose by Streptococcus mutans. The compositions include at least two flavor materials from group (a) and at least one flavor material from group (b). Representative group (a) flavors are decanol, nonanol and cinnamic aldehyde while typical group (b) flavors are nonanal, citral and peppermint oil of material origin.

The invention discloses a method for rapidly distinguishing different varieties of rice based on aldehyde compounds, which is characterized by comprising the following steps: collecting aroma components of rice in different regions by adopting headspace solid-phase microextraction; collecting data in aroma components of rice by adopting a gas chromatograph-mass spectrometer, and screening aldehydes; the result of the volatility analysis being provided in chromatographic peak area counting; using orthogonal partial least squares discriminant analysis OPLS-DA modeling to compare rice differences in different regions. and determining the content of aldehyde substances such as hexanal, heptanal, 3-methyl-butyraldehyde, 5-methyl-hexanal, n-octanal, 2-heptenal, nonanal, trans-2-octenal, benzaldehyde, trans-2-nonenal, trans-2-decenal, lauric aldehyde, trans-2-undecenal and the like as a recognition standard. The method disclosed by the invention is small in data volume and high in distinction degree. The method can quickly and accurately identify the rice producing area, and is beneficial to further processing and utilizing rice and developing related products.