To evaluate the influence of the type of fatty raw material on the volumetric mass transfer coefficient, three types of rice bran oil were used: artificially acidified refined oil (RBOr), crude oil (RBOc) and degummed oil (RBOd). Refined rice bran oil (Blue Ville, Brazil) was purchased from Santalúcia (Brazil), and the crude and degummed rice bran oils were kindly supplied by Helmut Tessmann (Brazil). The fatty acid source in the refined oil was a commercial oleic acid (Merck, Germany). In all trials, the solvent was neutral, food-grade aqueous ethanol purchased from a sugarcane processor (Usina Ester, Cosmópolis, Brazil).