In contrast to mechanical oil extraction using screw presses or expellers, in solvent extraction the oil is removed from the raw material using a solvent such as hexane, ethanol or supercritical fluids such as CO2 or water vapor. Solvent extraction is particularly suitable for larger processing capacities from approx. 100t/day and scores with higher oil yields compared to oil extraction with screw presses. However, the process also entails certain losses in product quality and requires higher investments in systems, not least because of the process complexity.
Depending on the starting material, the desired end product and other requirements such as bio-verifiability, different solvents come into question and different pre-treatment stages of the raw material are necessary.
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