METHOD FOR PURIFYING BIODIESEL OR BIODIESEL PRECURSORS

摘要

The method comprises incubating biodiesel and/or biodiesel precursor with an enzyme to convert or cleave a part of the glycoside contained in the biodiesel and/or biodiesel precursors. The biodiesel and/or biodiesel precursor comprises lecithin content. The conversion- and/or cleavage product of the glycoside received after the incubation have a lesser solubility in the biodiesel and/or biodiesel precursor than the glycoside, and are subsequently separated by sedimenting, filtering or transferring in a solvent phase, in which the conversion- and/or cleavage product have a higher solubility. The method comprises incubating biodiesel and/or biodiesel precursor with an enzyme to convert or cleave a part of the glycoside contained in the biodiesel and/or biodiesel precursors. The biodiesel and/or biodiesel precursor comprises lecithin content. The conversion-product and/or cleavage product of the glycoside received after the incubation have a lesser solubility in the biodiesel and/or biodiesel precursor than the glycoside, and are subsequently separated by sedimenting, filtering or transferring in a solvent phase, in which the conversion-product and/or cleavage product have a higher solubility than in the biodiesel and/or biodiesel precursor. The biodiesel precursor represents degummed and/or deodorized oil and/or fat, or an oil and/or fat are used for producing the biodiesel. The lecithin content of the oil, fat and/or biodiesel is less than 5 ppm. The enzyme is present in a condition, in which the glycoside cleaves or converts in the form of an aqueous enzyme solution. The incubation step comprises introducing starting mixtures, which comprise the biodiesel and/or biodiesel precursor and the glycoside, with water or aqueous cleaning mixture over a sufficient time period in a contacting manner, and separating an aqueous mixture from the cleaned starting mixture. The starting mixture or the aqueous cleaning mixture comprises the enzyme, which partially converts or cleaves the glycoside. The aqueous mixture comprises water and conversion-product or cleavage product of the glycoside. The enzyme is partially or completely soluble in water and/or completely remains in an aqueous phase. The aqueous phase is contacted with a phase comprising biodiesel and/or biodiesel precursor. The process comprises a washing step before or after the incubation. The biodiesel is partially or completely produced from vegetable or animal fats. An INDEPENDENT CLAIM is included for a biodiesel and/or biodiesel precursor.