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Preparation method for high-purity opticity bergamio

A technology of linalyl acetate and optical activity, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of unseen research reports and patent applications, and achieve the effect of price increase.

Inactive Publication Date: 2012-07-11
JIANGXI ACAD OF FORESTRY
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  • Description
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Embodiment 2

[0014] In this embodiment, when crude linalool is subjected to rectification and fractionation, the vapor pressure of rectification is controlled at 0.35-0.60KPA, the degree of vacuum is 0.07-0.10, the reflux ratio is 1 / 40-60, and the density is between 0.830-0.880. % more than natural linalool. Other process raw materials and conditions are all identical with embodiment 1.

Embodiment 3

[0016] The specific steps of this embodiment are as follows: take natural L-linalool and acetic anhydride with a purity of more than 99% as raw materials, feed them in a ratio of 1:1, and carry out esterification reaction under the catalyst potassium carbonate. The amount of catalyst potassium carbonate is the reactant natural 0.667% of the weight of L-linalool, the reaction temperature is 65-85°C, and the esterification reaction is carried out under reduced pressure (that is, the valve is opened under normal pressure) for 25-35 hours to obtain the product.

Embodiment 4

[0018] The specific steps of this embodiment are as follows: take natural L-linalool and acetic anhydride with a purity of more than 99% as raw materials, feed them in a ratio of 1.4:1, and carry out esterification reaction under the catalyst potassium carbonate. The amount of catalyst potassium carbonate is the reactant natural 0.669% of the weight of L-linalool, the reaction temperature is 65°C, and the esterification reaction is carried out under reduced pressure (that is, the valve is under normal pressure) for 25 to 35 hours to obtain the product.

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Abstract

The invention discloses a preparation method for high-purity opticity bergamio. The preparation method is a production process for preparing the high-purity opticity bergamio from canella natural opticity linalool and acetic anhydride through esterification reaction. The esterification reaction is performed in the presence of a catalyst potassium carbonate at the temperature of 65 and 85 DEG C and under reduced pressure for 25 to 35 hours, wherein the mass ratio of the linalool to the acetic anhydride is 1:1 to 1.5:1; and the using amount of the catalyst potassium carbonate is 0.615 to 0.667 percent of the weight of the reactant linalool. The prepared bergamio has opticity and the bergamio content is not less than 98.5 percent. By the method, the defect in preparation of bergamio raceme by using the linalool as a raw material is overcome; and technological support is provided for industrialized production of the opticity bergamio.

Description

technical field [0001] The invention relates to a method for preparing high-purity optically active linalyl acetate from natural linalool derived from lauraceae plants, and belongs to the technical field of fine chemicals. Background technique [0002] Linalyl acetate is an essential oil component distributed in a variety of plants. It has an elegant aroma similar to essential oils such as bergamot and lavender. It is an important spice component for the preparation of high-grade flavors. Development and utilization prospects. Due to the limited natural resources of linalyl acetate, the output is far from meeting the market demand. For this reason, it is mainly prepared by synthetic methods both at home and abroad. With the development of petrochemical technology, the synthesis of linalool with isoprene was successful and industrialized production was carried out in large quantities, which promoted the research on the synthesis of linalyl acetate with synthetic linalool and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/145C07C67/08
Inventor 江香梅李祥林肖复明李海浪章挺徐海宁
Owner JIANGXI ACAD OF FORESTRY
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