15 results about "Ethyl levulinate" patented technology

The invention relates to a process for preparing a levulinic-acid ester or alkyl levulinate, in particular ethyl levulinate, comprising the following steps: - preparing a solution containing furfuryl alcohol, an alcohol as solvent, and hydrochloric acid as catalyst acid, - esterifying this solution at a temperature in the range of 60-100°C to form alkyl levulinate, - neutralizing the catalyst acid in the mixture thus obtained, and - separating the alkyl levulinate from the humins formed as by-products. The invention also relates to a process for preparing gamma-valerolactone (GVL) by hydrogenating the alkyl levulinate obtained or obtainable by the process.

The present invention discloses a ternary metal oxide catalyst and its application in the catalytic synthesis of γ-valerolactone, including: adding ethyl levulinate, the catalyst and an alcohol solvent into a reaction kettle, then sealing the reaction kettle, without adding external hydrogen, carrying out a closed reaction at a stirring speed of 500 rpm at 200-270 °C for 1-5 h, and then cooling to room temperature to obtain the γ-valerolactone; the above catalyst is dried after centrifugal separation and directly used for the next reaction. The catalyst of the present invention prepares γ-valerolactone in the form of in-situ hydrogen production, with high selectivity and yield. Hydrogen does not need to be added during the whole process, reducing the cost of hydrogen transportation equipment. At the same time, the catalyst has excellent stability and can overcome the problem of deactivation during the recycling of the catalyst.

A fragrance carrier composition includes a levulinic acid-based solvent and a glycol-based solvent. The fragrance carrier composition is a non-ideal mixture. A fragrance delivery system includes a fragrance delivery device. The fragrance delivery device includes a reservoir, a porous medium, and a diffuser. At least a portion of a first end of the porous medium is disposed in the reservoir and an opposite end of the porous medium is located proximate to a diffuser. The reservoir includes a fragrance and a fragrance carrier composition. A method for diffusing a fragrance into the air includes diffusing a fragrance from a fragrance solution into the atmosphere surrounding the fragrance delivery system. The fragrance solution includes a fragrance and a fragrance carrier composition.

The application relates to the technical field of edible essence. The application discloses a yogurt essence and a preparation method thereof. The raw material composition of the yogurt essence comprises ethyl maltol, vanillin, butanedione, acetic acid, ethyl acetate, propionic acid, 2,3-pentanedione, 3-hydroxy-2-butanone, butyric acid, ethyl butyrate, isoamyl acetate, methyl thio butyrate, hexanoic acid, ethyl hexanoate, 10% furanone, isoamyl butyrate, ethyl levulinate, linalool, p-cymene, 4-terpinenol, nerol, citral, geraniol, neryl acetate, geranyl acetate, D-limonene, lemon oil, distilled white lemon oil, sweet orange oil, glycerol triacetate, rosemary extract and bitter gourd extract. The yogurt essence prepared by the application has a flavor closer to real yogurt, good thermal stability and good flavor persistence.

The present invention relates to a composition comprising: (a) 0.0001 to 5 wt.-% of a lactam; (b) 1 to 80 wt.-% of a solvent selected from the group consisting of 2-methyltetrahydrofuran, ethyl levulinate and ethyl levulinate glycerol ketal (LGK); or mixtures thereof; to a non-therapeutic method of surface treatment to increase the resistance of said surface against bacterial soiling; and to the use of a solvent selected from the group consisting of 2-methyltetrahydrofuran, ethyl levulinate and ethyl levulinate glycerol ketal (LGK); or mixtures thereof to improve the solubility of a lactam.

The fragrance carrier composition comprises a levulinic acid-based solvent and a glycol-based solvent. The fragrance carrier composition is a non-ideal mixture. The fragrance delivery system includes a fragrance delivery device. The fragrance delivery device includes a reservoir, a porous medium, and a diffuser. At least a portion of a first end of the porous medium is disposed in the reservoir, and the opposite end of the porous medium is located near the diffuser. The reservoir contains the fragrance and the fragrance carrier composition. A method for diffusing the fragrance into the air includes diffusing the fragrance from a fragrance solution into the atmosphere surrounding the fragrance delivery system. The fragrance solution contains the fragrance and the fragrance carrier composition.

The invention belongs to the technical field of fine chemical engineering, and discloses a preparation method of ethyl levulinate. The method comprises the following steps: by taking levulinic acid as a raw material, absolute ethyl alcohol as a solvent and an ammonia water hydrothermal modified HY type zeolite molecular sieve as a catalyst, carrying out esterification reaction at 60-140 DEG C in a normal-pressure N2 protection environment to generate ethyl levulinate. The HY type zeolite molecular sieve catalyst is subjected to hydrothermal modification by using ammonia water, so that the selectivity of ethyl levulinate in a final reaction product exceeds 90%. The reaction temperature is low, and the levulinic acid reaction speed is high. The HY type zeolite molecular sieve catalyst provided by the invention has good reusability in batch kettle reaction. According to the preparation method provided by the invention, the product is single, the reaction temperature is 120 DEG C, the reaction lasts for 4 hours, levulinic acid is completely converted, and the selectivity of ethyl levulinate is 92.1%.

The invention relates to a method for preparing a nickel-based porous carbon catalyst by using waste plastics, which comprises the following steps: dissolving nickel salt and waste plastics in an alcohol solution, stirring at normal temperature, dipping, drying in a drying oven, and evaporating the alcohol solvent to obtain a nickel-containing plastic solid; and putting the obtained nickel-containing plastic solid into a tubular furnace, and heating to a corresponding plastic pyrolysis temperature under the protection of an inert atmosphere to finish the plastic pyrolysis, thereby obtaining the nickel-containing plastic. According to the preparation method for preparing the nickel-based porous carbon catalyst from the waste plastics, other auxiliaries, catalysts and high-pressure conditions are not needed, the preparation process is simple and environmentally friendly, raw materials are easy to obtain, universality is high, and batch preparation is easy to achieve. The prepared nickel-based porous carbon catalyst is applied to transfer hydrogenation of ethyl levulinate to prepare gamma-valerolactone, hydrogen does not need to be additionally added, and the yield of gamma-valerolactone exceeds 90% under proper reaction conditions.

A method for preparing nickel-based porous carbon catalysts from waste plastics includes the following steps: dissolving nickel salts and waste plastics in an alcohol solution, stirring at room temperature, impregnating, drying in a drying oven, evaporating the alcohol solvent to obtain nickel-containing plastic solids; placing the obtained nickel-containing plastic solids in a tube furnace, heating to the corresponding plastic pyrolysis temperature under an inert atmosphere, and completing the plastic pyrolysis to obtain the catalyst. The method for preparing nickel-based porous carbon catalysts from waste plastics provided by this invention requires no other additives, catalysts, or high-pressure conditions. The preparation process is simple, environmentally friendly, uses readily available raw materials, has strong versatility, and is easy to implement in batches. This invention applies the obtained nickel-based porous carbon catalyst to the transfer hydrogenation of ethyl levulinate to prepare γ-valerolactone without the need for external hydrogen gas, and under suitable reaction conditions, the yield of γ-valerolactone exceeds 90%.

The invention provides a spice composition with fermented fruit juice fragrance, flower fragrance and radix aucklandiae as well as a preparation method and application of the spice composition. The perfume composition is prepared from the following components: 0.15 to 0.35 wt% of ethyl isovalerate, 0.15 to 0.35 wt% of phenethyl acetate, 0.15 to 0.35 wt% of ethyl butyrate, 0.3 to 0.5 wt% of propionic acid, 0.5 to 0.7 wt% of ethyl propionate, 1.5 to 3.0 wt% of nodular pomelo methane, 3.0 to 5.0 wt% of methyl anthranilate, 5.0 to 10.0 wt% of citrus essential oil, 0.2 to 0.4 wt% of ethyl levulinate, 1.0 to 2.0 wt% of ethyl maltol, 0.15 to 0.35 wt% of linfanglilian base, 10.0 to 15.0 wt% of methyl dihydrojasmonate, 10.0 to 15.0 wt% of musk T and 0.15 to 0.35 wt% of ombrox. And the balance of auxiliary spices and / or dispersants and / or stabilizers. The perfume composition realizes delicate construction of aroma levels and precise expression of olfactory images, can be used for daily chemical products and presents a complete aroma framework of front-adjusted fermented fruit juice aroma, middle-adjusted dried petal aroma and tail-adjusted quiet wood aroma.

The invention discloses a method for preparing ethyl levulinate through a microwave-assisted two-phase solvent system, and belongs to the technical field of ethyl levulinate preparation. The method comprises the following steps: putting a biomass raw material into a two-phase solvent system, and preparing ethyl levulinate by using a microwave-assisted catalyst, the catalyst is any one of Ti (SO4) 2 or a mixture of Ti (SO4) 2 and H2SO4; the solvent is a mixture of ethanol and gamma-valerolactone. Titanium sulfate is selected as a catalyst and is used for converting a biomass raw material solvent and successfully synthesizing ethyl levulinate. The esterification reaction path is not recorded in literatures so far, and the unique application potential of titanium sulfate in the field is shown.

The invention discloses a synthesis method of 5-aminolevulinic acid hydrochloride, which comprises the following steps: S1, in the presence of a perfluoromethanesulfonic acid metal complex catalyst, carrying out esterification reaction on levulinic acid in ethanol, then adding organic amine, inorganic bromide and 3-PyHBr3 into the reaction liquid, and carrying out bromination reaction to obtain 5-aminolevulinic acid hydrochloride; separating to obtain a 5-bromolevulinic acid ethyl ester crude product; s2, carrying out reaction on the 5-bromoethyl levulinate crude product and succinimide potassium salt, and separating to obtain a 5-succinimide substituted ethyl levulinate crude product; s3, the 5-succinimide substituted ethyl levulinate crude product is subjected to a hydrolysis reaction in the presence of hydrochloric acid, and 5-aminolevulinic acid hydrochloride is obtained. The method has the beneficial effects of low raw material cost, simple process, simple post-treatment, high total yield, mild reaction conditions and environmental protection.

The present invention relates to a heterogeneous ruthenium catalyst, which comprises elemental ruthenium supported on activated carbon carrier, where the catalyst has a total pore volume in the range of 0.3 to 0.6 ml / g, in particular in the range of 0.35 to 0.5 ml / g, and where pores having a pore diameter in the range of 10 to 200 nm contribute at least 50%, in particular at least 60%, especially at least 70%, to the total pore volume of the heterogeneous ruthenium catalyst. The present invention also relates to a process for the production of gamma-valerlactone, which comprises a hydrogenation of an levulinic acid or alkyl levulinate, such as methyl levulinate or ethyl levulinate, with hydrogen in the presence of a heterogeneous ruthenium catalyst, which comprises elemental ruthenium supported on activated carbon carrier, where the catalyst has a total pore volume in the range of 0.3 to 0.6 ml / g, and where pores having a pore diameter in the range of 10 to 200 nm contribute at least 50% to the total pore volume of the heterogeneous ruthenium catalyst.

The present invention relates to a cosmetic composition comprising dihydromyricetin DHM. Specifically, the present invention belongs to the field of cosmetology, and specifically relates to a cosmetic composition comprising dihydromyricetin (DHM) and at least one emollient selected from the group consisting of isopropyl lauroyl sarcosinate, butyl levulinate, ethyl levulinate and dimethyl decanamide, which significantly reduces crystal formation of DHM.

The invention discloses a method for preparing 5-methyl-2-pyrrolidone through reductive amination of ethyl levulinate, and belongs to the technical field of biomass fine chemical engineering. The method for preparing 5-methyl-2-pyrrolidone through reductive amination of ethyl levulinate comprises the following steps: in the presence of a catalyst bimetallic phosphate loaded nickel simple substance, directly mixing a reaction solvent and a reactant ethyl levulinate, introducing hydrogen and ammonia gas, and carrying out a one-pot reductive amination reaction, after the reaction is finished, the 5-methyl-2-pyrrolidone is obtained. Compared with the prior art, the method has the advantages that through the cheap non-noble metal catalyst Ni / (Gd-Al) PO4, direct reductive amination conversion from ethyl levulinate to 5-methyl-2-pyrrolidone can be efficiently realized, the selectivity is good, and the total yield of 5-methyl-2-pyrrolidone is high, so that the synthetic process method has relatively high potential economic value.