Exploring the potential of lipids from black soldier fly: New paradigm for biodiesel production (II)-Extraction kinetics and thermodynamic

This study investigated microwave extraction approach to extract lipids from the black soldier fly larval containing high lipids for biodiesel production. The comparison of the effects of different factors (solvent types, extraction temperature, and solute-solvent ratio) on the kinetics and thermodynamic of lipids extraction from the energy insect was investigated in detail. A mathematical model of lipids extraction from the pretreatment insect powder was proposed. The solid-solvent ratio and temperature can have a pronounced effect on lipids extraction rate k. The final yield of lipids increased by a factor of about 1.0-1.04 for extraction temperature elevated by 10 °C. The diffusion of lipids in the solvent constituted the limitation step in the process of extraction. The magnitudes of the diffusion coefficients range from 6.7 × 10−12-16.1 × 10−12 m2/s for three solvents used. The values of the activation energy Ea were 84.26 kJ mol−1 during the diffusion stage (30 °C-60 °C). At last, the three thermodynamic parameters results (ΔH, ΔS, ΔG) were also obtained from the extraction process.