Method for preparing aromatic plant essential oil by using subcritical CO2 fluid extraction technology

Abstract

The invention relates to a method for preparing aromatic plant essential oil by using a subcritical CO2 fluid extraction technology. The method is characterized in that 0.5-5% of polar solvent is added to subcritical CO2 fluid (40 DEG C, 250 bar) so as to serve as a carrying agent, so that the formed subcritical CO2 fluid extraction technology realizes the preparation of the essential oil under the conditions of room temperature and low pressure (20-30 DEG C, 100-200 bar), the product is high in yield and has good quality, wherein the essential oil prepared by the subcritical CO2 fluid extraction technology preferably using an ethyl alcohol and ethyl acetate mixed solvent as the carrying agent has the advantages that the extraction rate of SFE (Supercrtical Fluid Extraction) lavender essential oil can be increased from 2.58% to 4.33% and the extraction rate of SFE rhaponticum carthamoides essential oil can be increased from 0.15% to 0.21%. The total content of the four marking components (linalyl acetate, lavandayl acetate and lavandulol) in the Sinkiang lavender essential oil is increased and reaches above 87%.

Description

technical field [0001] The present invention relates to a kind of using subcritical CO 2 Fluid extraction technology is a method for preparing essential oil from aromatic plants Lamiaceae Lavender and Asteraceae Lavender as raw materials. Background technique [0002] Aromatic plant essential oils have been widely used in medicine, smoked tea, cosmetics, washing, food and other industries in recent years due to their unique aroma and physiological activity. Western countries have long been committed to the extraction of aromatic plant essential oils. To this day, many methods of extracting essential oils have been formed. Extracting essential oils from aromatic plants has been followed by steam distillation, pressing and organic solvent extraction. The steam distillation method needs to heat the raw materials, which is not suitable for the extraction of chemically unstable components; the yield of the squeezing method is low; the organic solvent extraction method will cau...

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Problems solved by technology

At present, the common method of producing these two essential oils is still the steam distillation method, which has the disadvantages of loss of "top aroma" and ea

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