Process for supercritical CO2 extraction of agilawood essential oil and optimization method thereof

Abstract

The invention discloses a method for optimizing a supercritical CO2 extraction process of agilawood essential oil. The method comprises the following steps: S1, pretreatment: obtaining dry agilawood powder; S2, single-factor analysis: carrying out particle size analysis, extraction pressure analysis, extraction temperature analysis and extraction time analysis; and S3, response surface analysis: selecting the first three factors of granularity, extraction pressure, extraction temperature and extraction time contribution degree as reference factors, and taking the extraction rate of the agilawood essential oil as an evaluation index to perform response surface analysis. The contribution degree of each factor to the extraction rate of the agilawood essential oil is obtained through single factor analysis. A mathematical model is established by utilizing a response surface analysis method. Key factors and interactions thereof are selected by utilizing a response surface diagram of the model: the granularity is 30-50 meshes, the extraction temperature is 40 DEG C, the extraction pressure is 18MPa, the extraction time is 2h, the extraction rate of the agilawood essential oil reaches 0.688%, and the reliability of a result is verified by GC-MS (Gas Chromatography Mass Spectrometry), so that the method is an optimization method suitable for a supercritical CO2 fluid extraction processfor agilawood essential oil.

Description

technical field [0001] The invention relates to the technical field of essential oil extraction, more specifically, to a supercritical CO 2 Extraction technology of agarwood essential oil and its optimization method. Background technique [0002] Agarwood (Incense) is a substance that grows from trees for many years. But it is neither a kind of wood nor a kind of oil, but the fragrant tree "knotted" after many years in special environments, such as insect bites in nature, fungal infection and fermentation, or artificial holes and cuts. It is a mixture of resin, gum, volatile oil, wood and other ingredients. Because it sinks when put into water, it has a strong fragrance, so it is called agarwood. [0003] Essential oil is also called "aromatic oil" or "volatile oil", which refers to the aromatic volatile oily substances extracted from different parts of aromatic plants or their secretions by physical methods, such as pressing, distillation, adsorption or extraction. [0...

AI Technical Summary

Problems solved by technology

[0006] The extraction rate of essential oils in the raw materials is very small, generally only a few per thousand. Using solvent extraction method not only has an unsatisfactory extraction rate, but also causes the loss of precious agarwood raw materials, and toxic and harmful organic reagents are harmful to Both the environment and the human body are damaged

Therefore, there is still a lack of an environmentally friendly, low-harm and high-efficiency extraction method for agarwood essential oil

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