【摘要】 目的在萃取压力10～25MPa、萃取温度33～48℃、CO2流量2～4L/min的范围内研究了超临界CO2萃取川芎挥发油过程。考察了萃取压力、温度、流量对萃取过程的影响。方法将萃取过程考虑为CO2通过川芎固定床的模型,由Stastova提出的传质方程对不同压力、温度及CO2流量下的萃取过程进行模拟,并对不同操作条件下传质系数的变化进行了分析。结果本法在萃取川芎挥发油得到的传质系数随着温度的升高略为增大,随着流量的增大而增大,随着压力的增大而减少。结论该模型可以对超临界萃取川芎挥发油过程进行较好的描述。更多还原

【Abstract】 AIM: Supercritical CO₂ extraction of Rhizoma Chuanxiong volatile oil was studied under conditions of extraction temperature between 33-48 ℃,pressure between 10-25 MPa and CO₂ flow rate between 2-4 L·min -1 .Influence of extraction conditions on solubility and mass transfer rate were analyzed. METHODS: Based on plug flow in fixed bed,experimental extraction curves were evaluated using a model put forward by Stastova.And the effects of extraction conditions on mass transfer coefficients were also analyzed. RESULTS: Coefficient of mass transfer was slowly increased as the extraction temperature elevated,and was in accord with flow and in contrast with pressure. CONCLUSION:The method has a practical use value in the extraction of Rhizoma Chuanxiong volatile oil.更多还原