8 results about "Dehydrolinalool" patented technology

The invention relates to the technical field of chemical engineering, and discloses a preparation method of linalool. According to the preparation method, a proper amount of auxiliaries containing Zn, Co and Fe elements are added into dehydrolinalool serving as a reaction raw material, so that the catalyst can break through the catalytic characteristic of the catalyst in the hydrogenation reaction process, the hydrogenation degree of the raw material is regulated and controlled, a certain amount of by-products dihydrolinalool and cyclodehydrolinalool capable of regulating and controlling fragrance are generated, and through testing of a professional fragrance evaluator, the effect is remarkable. The linalool product prepared by the invention is more fragrant, and the product quality is improved. Meanwhile, before the hydrogenation reaction liquid is rectified and refined, the reaction liquid is washed with an alkali solution to be subjected to deacidification treatment, so that the linalool can be inhibited from being dehydrated in the rectification process, and the product purity and the qualified product yield are improved.

The invention discloses a preparation method of tetrahydrolinalool, belongs to the technical field of tetrahydrolinalool preparation, and overcomes the defects that in the prior art, in the tetrahydrolinalool preparation process, reaction liquid needs to be separated to meet subsequent use, and the process is complex. The preparation method of the tetrahydrolinalool comprises the following steps: S1, pre-activating a catalyst by using alkali liquor; the catalyst comprises a carrier and an active component, and the alkali liquor comprises an alkali metal element and / or an alkaline earth metal element; and S2, carrying out hydrogenation reduction on the dehydrolinalool in a fixed bed reactor to obtain a tetrahydrolinalool product by using the catalyst pre-activated in S1 and tetrahydrolinalool as a solvent. The dehydrolinalool can be efficiently hydrogenated into the tetrahydrolinalool, the product has few impurities and high yield, the reaction liquid can meet the use requirements without being separated, and the fragrance of the tetrahydrolinalool is better than that of the tetrahydrolinalool prepared by the traditional process.

The invention discloses a synthetic method of dehydrolinalool, and relates to the technical field of fine chemical engineering, and the synthetic method comprises the following steps: carrying out a reaction on linalool and acetic anhydride to obtain acetyl linalool; the preparation method comprises the following steps: carrying out a reaction on 2, 6-dimethyl-3-chloro-6-acetoxyl-1, 7-octadiene and trichloroisocyanuric acid to obtain 2, 6-dimethyl-3-chloro-6-acetoxyl-1, 7-octadiene; under the action of aluminum phosphotungstate, reacting with lithium hydroxide to obtain 2, 6-dimethyl-6-acetoxyl-1, 3 (E), 7-octyltriene, and then reacting with 2, 6-dimethyl-6-acetoxyl-1, 3 (E), 7-octyltriene under the action of aluminum phosphotungstate; 2, 6-dimethyl-1, 3 (E), 7-trialkenyl-6-octanol reacts with a sodium hydroxide solution, and 2, 6-dimethyl-1, 3 (E), 7-trialkenyl-6-octanol is obtained; the preparation method comprises the following steps: under the catalysis of SO4 < 2-> / Fe2O3 and lipase Lipase AK, reacting with p-chlorophenol acetate to obtain (R)-2, 6-dimethyl-6-acetoxy-1, 3 (E), 7-octyltriene; and reacting with a sodium hydroxide solution to obtain the dehydrolinalool. The method is mild in reaction condition, low in cost and suitable for industrial production.

This invention relates to the field of high-natural-content honey flavoring, specifically to a high-natural-content honey flavoring and its preparation method, which addresses the problems of low naturalness, weak aroma intensity, poor flavor simulation, and significant difference from natural honey flavor in existing honey flavorings. The method involves placing propylene glycol and 4-hydroxy-2,5-dimethyl-3(2H)furanone in a jacketed, temperature-controlled food-grade stainless steel mixing container, stirring, then cooling while maintaining stirring. Honey flavor base, dehydrolinalool, linalool oxide, linalool, phenylethanol, and flavor-modifying flavor base are added sequentially, stirred, and then transferred to an ultrasonic-resistant, food-grade sealed container. The container is then placed in an ultrasonic treatment device for ultrasonic treatment, filtered, and the filtrate is collected and allowed to mature to obtain a high-natural-content honey flavoring. The prepared high-natural-content honey flavoring significantly improves the simulation and intensity of honey aroma in food systems and results in a more harmonious taste.

The invention relates to a preparation method of unsaturated ketone and a used catalyst. Ketone groups and hydroxyl groups in the buprofezin salt ionic liquid and hydrogen atoms and oxygen atoms in propargyl alcohol such as dehydrolinalool can respectively form dihydrogen bonds, so that the effect of activating a substrate is achieved, in addition, electron delocalization exists in a buprofezin structure part, a conjugation effect is achieved, the hydrogen bonds are stronger, the use amount of a catalyst can be greatly reduced, and the cost is reduced. The conversion rate and selectivity of the reaction are improved, the conversion rate of the reaction can reach 99.0% or above, and the selectivity of the reaction can reach 97.5% or above. The loop reactor is adopted for reaction, reaction heat can be effectively removed, temperature control is more stable, the temperature effect in the reaction process is reduced, selectivity can be improved, and continuous production can be achieved.

This invention provides a method for effectively improving the purity of linalool products. A catalyst is added to the reaction solution of dehydrolinalool selectively hydrogenated to produce linalool. This catalyst catalyzes the incomplete conversion of the dehydrolinalool feedstock to undergo an isomerization reaction, generating 3,7-dimethyl-3,6-octadien-2-one and citral, whose boiling points differ significantly from linalool. These are then separated. In the selective hydrogenation of dehydrolinalool to produce linalool, a small amount of dehydrolinalool feedstock remains in the resulting hydrogenation reaction solution. Because dehydrolinalool and linalool have very similar boiling points and are prone to self-cyclization reactions, generating cyclized impurities with similar boiling points to linalool, the distillation purification of linalool suffers from drawbacks such as high plate number, large reflux ratio, and significant product loss. This invention uses a method of adding a small amount of catalyst to the reaction solution to catalyze the isomerization of residual dehydrolinalool into high-boiling-point impurities such as citral. Compared to the traditional distillation process, this invention effectively reduces distillation energy consumption and product loss, obtaining higher purity linalool products at a lower separation cost.

The application discloses a synthesis method of dehydro-linalool, and relates to the technical field of fine chemical engineering, which comprises the following steps: linalool is reacted with acetic anhydride to obtain acetyl-linalool; the acetyl-linalool is reacted with trichloroisocyanuric acid to obtain 2,6-dimethyl-3-chloro-6-acetyloxy-1,7-octadiene; the 2,6-dimethyl-3-chloro-6-acetyloxy-1,7-octadiene is reacted with lithium hydroxide under the action of aluminum phosphotungstate to obtain 2,6-dimethyl-6-acetyloxy-1,3(E),7-octatriene; the 2,6-dimethyl-6-acetyloxy-1,3(E),7-octatriene is reacted with a sodium hydroxide solution to obtain 2,6-dimethyl-1,3(E),7-trienyl-6-octanol; under the catalysis of SO4 2‑ / Fe2O3 and lipase Lipase AK, the 2,6-dimethyl-1,3(E),7-trienyl-6-octanol is reacted with p-chlorophenol acetate to obtain (R)-2,6-dimethyl-6-acetyloxy-1,3(E),7-octatriene; and the (R)-2,6-dimethyl-6-acetyloxy-1,3(E),7-octatriene is reacted with a sodium hydroxide solution to obtain dehydro-linalool. The application has the advantages of mild reaction condition, low cost and suitability for industrial production.

The application provides a method for preparing high-purity linalool by homogeneous hydrogenation of dehydrolinalool. By controlling the content of substance A in the dehydrolinalool, preferably also controlling the molar concentration of a palladium catalyst in the reaction solution, the reaction temperature and the reaction residence time, the reaction conversion rate is greater than or equal to 99.8%, the reaction selectivity is greater than or equal to 99.5%, and the purity of the product linalool is greater than or equal to 99.5%, and the product has good aroma, the catalyst consumption is small, the operation is simple, and the operation time is short. The structure of the substance A is: