Supercritical CO_2 Extraction of Essential Oil from the Flower of Chrysanthemum indicum Lamb

The extraction and isolation conditions of essential oil were studied using the flower of Chrysanthemum indicum Lamb as the starting material with supercritical CO2 process.Influences of extraction temperature,extraction pressure,and extraction time on the content of essential oil were investigated,and suitable conditions were determined based on the single-factor tests.They were as follows:extraction temperature 35℃,separation temperature 30 ℃,extraction time 90 min,extraction pressure 25 MPa and CO2 flow 30 kg/h.The yield of essentical oil was 9.7 % under above conditions.Using GC-MS analysis,43 compounds were identified.They were mainly terpen compounds and their oxides,hydrocarbon compounds,ester compounds and so on.