超临界CO_2萃取红花药渣中挥发油和红色素

Extraction of Essential Oil and Carthamin from Safflower Dreg with Supercritical CO_2

在0.5L半连续装置上,考察了温度、压力、CO2流量及物料粒径等工艺条件对超临界CO2分级萃取红花水煮醇提药渣的影响,得到了红花挥发油和红花红色素,对红色素含量进行了测定,并同红花分级萃取进行了对比.结果表明,温度、压力及CO2流量对分级萃取影响明显.在考察范围内最佳工艺条件为:一级萃取温度35℃、压力9MPa、CO2流量3.74kg/h;二级萃取温度35℃、压力30MPa、CO2流量3.74kg/h.在此条件下红花挥发油萃取率达2.74%,红色素相对收率达69.88%.

To obtain safflower essential oil and carthamin from safflower dreg by supercritical CO2 two-step extraction,a series operational parameters of pressure,temperature and CO2 flow rate were investigated in a bench-scale apparatus.The result shows that the rise of CO2 flow rate and the decrease of temperature lead to the increase in extraction rate of safflower dreg.Furthermore,the optimum conditions of extraction of safflower dreg are：in the first-step extraction,temperature at 35℃,pressure at 9 MPa,CO2 flow rate at 3.74 kg/h,in the second-step extraction,temperature at 35℃,pressure at 30 MPa,and CO2 flow rate at 3.74 kg/h.The extraction rates of essential oil and carthamin are 2.74% and 69.88%,respectively.