A kind of preparation method of high-purity hangbai chrysanthemum essential oil

Abstract

The invention discloses a method for preparing high-purity Hangzhou white chrysanthemum essential oil. The method comprises the following steps: (1) carrying out spraying treatment on Hangzhou white chrysanthemum raw materials by using water; (2) pre-freezing the Hangzhou white chrysanthemum after being subjected to the spraying treatment and carrying out vacuum sublimation drying; (3) smashing the Hangzhou white chrysanthemum after being subjected to the freeze drying; (4) putting the smashed Hangzhou white chrysanthemum raw materials and a fluid in a super-critical state into an extraction kettle and extracting to obtain Hangzhou white chrysanthemum crude oil through supercritical fluid extraction; and (5) purifying and separating the Hangzhou white chrysanthemum crude oil obtained through the supercritical fluid extraction through secondary molecular distillation to collect the high purity Hangzhou white chrysanthemum essential oil. The method has the advantages that the shortages of traditional extraction methods are avoided and effective constituents of plants are protected from being heated and damaged to the maximum limit; the extraction requirements of rapidness, high efficiency, fullness and completeness are achieved; and the method is simple and convenient in operation and high in separating speed and the working efficiency is greatly increased.

Description

technical field

[0001] The invention relates to the technical field of extracting natural plant essential oils, in particular to a preparation method of high-purity chrysanthemum essential oil. Background technique

[0002] Our country has rich botanical natural spice resources, but due to the backward extraction technology, only part of the spice resources have been developed and utilized. Many plant-based natural flavors can only be initially extracted, and the extraction yield and purity are low, the quality of aroma is seriously damaged, and harmful solvents are easy to remain, resulting in a serious waste of resources.

[0003] Supercritical fluid extraction and molecular distillation technology is a new generation of extraction technology in recent years. Supercritical fluid extraction is to use supercritical state fluid to have a special dissolution effect on some special natural products. It can be extracted under the cover of fluid close to room temperature and sup...