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ENRICHMENT OF NATURAL PRODUCTS USING AN INTEGRATED SOLVENT-FREE PROCESS : MOLECULAR DISTILLATION

Molecular distillation is a potential process for separation, purification and/or concentration of natural products, usually constituted by complex and thermally sensitive molecules, such as vitamins. Furthermore, this process has advantages over other techniques that use solvents as the separating agent, avoiding problems of toxicity. This process is characterized by short exposure of the distilled liquid to high temperatures, by high vacuum (around 10 mmHg) in the distillation space and by a small distance between the evaporator and the condenser (around 2 cm). The productivity of the process is high, considering the concentration of high added value compounds. In this work, the molecular distillation process was applied to enrich borage oil in gamma-linolenic acid (GLA) and also to recover tocopherols from deodorizer distillate of soybean oil (DDSO), since these are components of interest for food and pharmaceutical industries.