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| Kinetics of oil extraction from Nannochloropsis oculata |
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| DOI： |
| KeyWord:Nannochloropsis oculata ultrasound oil extraction kinetic equation |
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| Abstract: |
| 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 Ficks 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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