Solvent extraction is an industrial oilseed processing method in which prepared flakes are washed with a solvent, typically hexane, to dissolve and recover oil, achieving higher yields and lower residual oil in the meal than mechanical pressing alone.
In trade practice
Prepared oilseed flakes pass through an extractor where solvent percolates through the bed, producing a mixture of oil and solvent called miscella. The miscella is distilled to separate the oil, and the spent flakes are desolventised by steam to remove residual solvent before the meal is used in feed or food applications. Buyers of refined oil should request a certificate of analysis confirming that residual solvent levels comply with the limits set in the relevant EU food law. Confusing solvent-extracted oil with cold-pressed oil in labelling is a significant compliance risk.
In a specification
An oil supply specification should state whether solvent extraction is permitted or excluded, and where permitted, require confirmation that residual solvent content complies with applicable EU maximum levels.