Technical optimization on supercritical CO2 extraction of rose essential oil

To improve the yield rate of rose essential oil from dry rose by supercritical CO2 extraction,the effects of concentration of alcohol entrainer,extraction pressure,extraction temperature,entrainer flow and extraction time were investigated in sequence,and then the relevant technical optimization was performed by orthogonal design experiment.The results showed that,the absolute alcohol was better as the extraction entrainer than the alcohol aqueous solution. Meanwhile,the yield rate of 2- phenylethanol,one of major flavor components in essential oil production increased firstly and decreased later with a rise of the extraction pressure,extraction temperature,entrainer flow or extraction time. Besides,the factors influencing the yield were as follows: extraction pressure >entrainer flow > extraction temperature,as a result,the optimum technology conditions were extraction pressure23 MPa,extraction temperature 40℃,entrainer flow 0.06 m L / min and extraction time 1.5h,while the corresponding yield rate of 2- phenylethanol was 0.795‰.