用超临界技术提取八角茴香油的研究

A STUDY OF THE EXTRACTION TECHNOLOGY OF THB FRUIT OIL FROM ILLICIUM VERUM BY SUPERCRITICAL CARBON DIOXIDE FLUID

本文用超临界CO_2技术对广西大宗香料资源——八角茴香果中提取八角茴香油进行系统的研究,对萃取时间、流体密度与萃取率的关系进行探讨,为制定优化工艺条件提供了理论依据。

This paper is a systematic research on the extraction of leaching star anise oil from illicium verum, which abounds in Guangxi, by means of supercritical carbon dioxide fluid. The exeperiment is carried out in a four-litter supercritical fluid extraction equidment imported from NOVA Company Switzerland. The research is a systematic study of the relations of extraction time and fluid density to the extraction rate, etc. The experimental results point out: mass tranters in the extraction course are controlled by internal diffusions in plant cells; the best time for leaching star anise oil with supercritical carbon dioxide fluid is about two hours; the extraction temperature and the extraction pressute rema- rkably affect the quality of star anise oil, when the pressure is lower, the quality of star anise oil is better; Compared with the star anise oil by vapor distillation, the qualily of the oil from supercritical extr- action is better; the relation between extraction rate (η) and ftuid density (ρ_R) can be desribed by the following equation: In(η_1/η_2)= B(ρ_(R1)ρ_(R2))+In(ρ_(R1)/ρ_(R2) it shows that fluid density is very effective to the extraction rate, with the increase of the fluid density, the extraction rate increases, but exists an optimum point.