对不同条件下微拟球藻油脂提取过程进行了动力学分析,以动力学方程C=Ce×(1-exp-kt)进行数据拟合,研究了溶剂、料液比、提取温度、振荡和超声波处理对提油率的影响.结果表明:该过程符合Fick第二定律,该方程能够较为准确地模拟微拟球藻的油脂提取过程,总提油率Ce和传质系数k随着提取条件不同而表现出差异;以石油醚为溶剂,在料液比1∶5、提取温度50℃、超声波辅助条件下,微拟球藻的提油率达到24.68％,比对照组(静置处理)提高了1.44倍,最大有效扩散率Deff达到1.158 6×10-16 m2/s.%Kinetic studies were carried out to investigate the oil extraction from Nannochloropsis oculata,and the equation C =Ce × (1-exp-kt) was used for data fitting.The effects of solvent,ratio of material to liquid,extraction temperature,oscillation and ultrasonic treatment on the oil extraction rate were studied.The results showed that the kinetic model conformed to the Fick's second law,and the equation could accurately simulate the oil extraction process.The total oil extraction rate Ce and the mass transfer coefficient k changed under different extraction conditions.The optimal extraction conditions were abtained as follows:with petroleum ether as solvent,ratio of material to liquid 1 ∶ 5,extraction temperature 50 ℃,with ultrasonic treatment.Under these conditions,the oil extraction rate of Nannochloropsis oculata was 24.68 ％,1.44 times higher than the control group (static treatment),and the effective diffusion rate Deff reached 1.158 6 × 10-16 m2/s.
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