| 摘要 |
The invention relates to a method of increasing the oxidation stability of biodiesel, which comprises adding a primary antioxidant having a melting point of less than or equal to 40° C. to the biodiesel to be stabilized in an amount of from 10 to 20 000 ppm (w/w), where the primary antioxidant comprises at least one compound having the structure where: R<SUB>1</SUB>, R<SUB>2</SUB>=hydrogen, a linear alkyl group having from 1 to 20 carbon atoms or where * is a carbon atom of the aromatic ring system, R<SUB>3</SUB>, R<SUB>5</SUB>=hydrogen, a linear alkyl group having from 1 to 20 carbon atoms, R<SUB>4</SUB>=hydrogen, a linear alkyl group having from 1 to 40 carbon atoms, where both the substituents of the type R<SUB>1 </SUB>and R<SUB>2 </SUB>and those of the type R<SUB>3 </SUB>and R<SUB>5 </SUB>are in each case identical or different.
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