Through the analysis of mathematical model in extracting active principle from agricultural bio materials, it was proved that the extraction velocity of extraction system was related to phase areas and agitating intensity.

• 通过对农业生物材料有效组分萃取分离过程扩散模式的数学模型分析，得出体系的萃取速率与相界面积和搅拌强度有关的理论判据。