Process for producing biodiesel fuels with improved properties at low temperature by transesterification of triglycerides with alcohols such as methanol or ethanol, optionally in the presence of methyl or ethyl acetates and an inert solvent, to produce methyl or ethyl esters of fatty acids, glycerin and where appropriate, glycerin triacetate, followed by the separation of the crude glycerin that is reacted with aldehydes, ketones and / or acetic acid or methyl or ethyl acetates to produce acetals, glycerin ketals and / or glycerin acetates. Acetals, glycerin ketals and / or glycerin acetates are mixed with the methyl or ethyl esters of fatty acids in concentrations of approximately 0.5-20% by weight to obtain a biodiesel with improved properties at low temperatures.
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